From b74a22ddd7fccd701d4a11f08d0455c5300cf73d Mon Sep 17 00:00:00 2001 From: Phil-Schmidt Date: Sun, 19 Nov 2017 14:28:06 +0100 Subject: [PATCH 1/4] Added AES Algorithm Added AES in the cipher directory. Current features: - Full encryption - Full decryption Remaining Issues: - Implement commandline I/O for key, text and mode selection - Fix bugs in key schedule (generated key set is not the correct) - Write unittests --- ciphers/AES.java | 517 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 517 insertions(+) create mode 100644 ciphers/AES.java diff --git a/ciphers/AES.java b/ciphers/AES.java new file mode 100644 index 000000000000..0458ea028fef --- /dev/null +++ b/ciphers/AES.java @@ -0,0 +1,517 @@ +package ciphers; + +import java.math.BigInteger; + +/* This class is build to demonstrate the + * apllication of the AES-algorithm on + * a single 128-Bit block of data. + * */ +public class AES { + + /* + * Precalculated values for x to the power of 2 in Rijndaels galois field. + * Used as 'rcon' in during the key expansion. + */ + private static int[] rcon = { 0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36, 0x6c, 0xd8, 0xab, + 0x4d, 0x9a, 0x2f, 0x5e, 0xbc, 0x63, 0xc6, 0x97, 0x35, 0x6a, 0xd4, 0xb3, 0x7d, 0xfa, 0xef, 0xc5, 0x91, 0x39, + 0x72, 0xe4, 0xd3, 0xbd, 0x61, 0xc2, 0x9f, 0x25, 0x4a, 0x94, 0x33, 0x66, 0xcc, 0x83, 0x1d, 0x3a, 0x74, 0xe8, + 0xcb, 0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36, 0x6c, 0xd8, 0xab, 0x4d, 0x9a, 0x2f, + 0x5e, 0xbc, 0x63, 0xc6, 0x97, 0x35, 0x6a, 0xd4, 0xb3, 0x7d, 0xfa, 0xef, 0xc5, 0x91, 0x39, 0x72, 0xe4, 0xd3, + 0xbd, 0x61, 0xc2, 0x9f, 0x25, 0x4a, 0x94, 0x33, 0x66, 0xcc, 0x83, 0x1d, 0x3a, 0x74, 0xe8, 0xcb, 0x8d, 0x01, + 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36, 0x6c, 0xd8, 0xab, 0x4d, 0x9a, 0x2f, 0x5e, 0xbc, 0x63, + 0xc6, 0x97, 0x35, 0x6a, 0xd4, 0xb3, 0x7d, 0xfa, 0xef, 0xc5, 0x91, 0x39, 0x72, 0xe4, 0xd3, 0xbd, 0x61, 0xc2, + 0x9f, 0x25, 0x4a, 0x94, 0x33, 0x66, 0xcc, 0x83, 0x1d, 0x3a, 0x74, 0xe8, 0xcb, 0x8d, 0x01, 0x02, 0x04, 0x08, + 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36, 0x6c, 0xd8, 0xab, 0x4d, 0x9a, 0x2f, 0x5e, 0xbc, 0x63, 0xc6, 0x97, 0x35, + 0x6a, 0xd4, 0xb3, 0x7d, 0xfa, 0xef, 0xc5, 0x91, 0x39, 0x72, 0xe4, 0xd3, 0xbd, 0x61, 0xc2, 0x9f, 0x25, 0x4a, + 0x94, 0x33, 0x66, 0xcc, 0x83, 0x1d, 0x3a, 0x74, 0xe8, 0xcb, 0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, + 0x80, 0x1b, 0x36, 0x6c, 0xd8, 0xab, 0x4d, 0x9a, 0x2f, 0x5e, 0xbc, 0x63, 0xc6, 0x97, 0x35, 0x6a, 0xd4, 0xb3, + 0x7d, 0xfa, 0xef, 0xc5, 0x91, 0x39, 0x72, 0xe4, 0xd3, 0xbd, 0x61, 0xc2, 0x9f, 0x25, 0x4a, 0x94, 0x33, 0x66, + 0xcc, 0x83, 0x1d, 0x3a, 0x74, 0xe8, 0xcb, 0x8d }; + + /* + * Rijndael S-box Substitution table used for encryption in the subBytes + * step, as well as the key expansion. + */ + private static int[] sBox = { 0x63, 0x7C, 0x77, 0x7B, 0xF2, 0x6B, 0x6F, 0xC5, 0x30, 0x01, 0x67, 0x2B, 0xFE, 0xD7, + 0xAB, 0x76, 0xCA, 0x82, 0xC9, 0x7D, 0xFA, 0x59, 0x47, 0xF0, 0xAD, 0xD4, 0xA2, 0xAF, 0x9C, 0xA4, 0x72, 0xC0, + 0xB7, 0xFD, 0x93, 0x26, 0x36, 0x3F, 0xF7, 0xCC, 0x34, 0xA5, 0xE5, 0xF1, 0x71, 0xD8, 0x31, 0x15, 0x04, 0xC7, + 0x23, 0xC3, 0x18, 0x96, 0x05, 0x9A, 0x07, 0x12, 0x80, 0xE2, 0xEB, 0x27, 0xB2, 0x75, 0x09, 0x83, 0x2C, 0x1A, + 0x1B, 0x6E, 0x5A, 0xA0, 0x52, 0x3B, 0xD6, 0xB3, 0x29, 0xE3, 0x2F, 0x84, 0x53, 0xD1, 0x00, 0xED, 0x20, 0xFC, + 0xB1, 0x5B, 0x6A, 0xCB, 0xBE, 0x39, 0x4A, 0x4C, 0x58, 0xCF, 0xD0, 0xEF, 0xAA, 0xFB, 0x43, 0x4D, 0x33, 0x85, + 0x45, 0xF9, 0x02, 0x7F, 0x50, 0x3C, 0x9F, 0xA8, 0x51, 0xA3, 0x40, 0x8F, 0x92, 0x9D, 0x38, 0xF5, 0xBC, 0xB6, + 0xDA, 0x21, 0x10, 0xFF, 0xF3, 0xD2, 0xCD, 0x0C, 0x13, 0xEC, 0x5F, 0x97, 0x44, 0x17, 0xC4, 0xA7, 0x7E, 0x3D, + 0x64, 0x5D, 0x19, 0x73, 0x60, 0x81, 0x4F, 0xDC, 0x22, 0x2A, 0x90, 0x88, 0x46, 0xEE, 0xB8, 0x14, 0xDE, 0x5E, + 0x0B, 0xDB, 0xE0, 0x32, 0x3A, 0x0A, 0x49, 0x06, 0x24, 0x5C, 0xC2, 0xD3, 0xAC, 0x62, 0x91, 0x95, 0xE4, 0x79, + 0xE7, 0xC8, 0x37, 0x6D, 0x8D, 0xD5, 0x4E, 0xA9, 0x6C, 0x56, 0xF4, 0xEA, 0x65, 0x7A, 0xAE, 0x08, 0xBA, 0x78, + 0x25, 0x2E, 0x1C, 0xA6, 0xB4, 0xC6, 0xE8, 0xDD, 0x74, 0x1F, 0x4B, 0xBD, 0x8B, 0x8A, 0x70, 0x3E, 0xB5, 0x66, + 0x48, 0x03, 0xF6, 0x0E, 0x61, 0x35, 0x57, 0xB9, 0x86, 0xC1, 0x1D, 0x9E, 0xE1, 0xF8, 0x98, 0x11, 0x69, 0xD9, + 0x8E, 0x94, 0x9B, 0x1E, 0x87, 0xE9, 0xCE, 0x55, 0x28, 0xDF, 0x8C, 0xA1, 0x89, 0x0D, 0xBF, 0xE6, 0x42, 0x68, + 0x41, 0x99, 0x2D, 0x0F, 0xB0, 0x54, 0xBB, 0x16 }; + + /* + * Inverse Rijndael S-box Substitution table used for decryption in the + * subBytesDec step + */ + private static int[] inverseSBox = { 0x52, 0x09, 0x6A, 0xD5, 0x30, 0x36, 0xA5, 0x38, 0xBF, 0x40, 0xA3, 0x9E, 0x81, + 0xF3, 0xD7, 0xFB, 0x7C, 0xE3, 0x39, 0x82, 0x9B, 0x2F, 0xFF, 0x87, 0x34, 0x8E, 0x43, 0x44, 0xC4, 0xDE, 0xE9, + 0xCB, 0x54, 0x7B, 0x94, 0x32, 0xA6, 0xC2, 0x23, 0x3D, 0xEE, 0x4C, 0x95, 0x0B, 0x42, 0xFA, 0xC3, 0x4E, 0x08, + 0x2E, 0xA1, 0x66, 0x28, 0xD9, 0x24, 0xB2, 0x76, 0x5B, 0xA2, 0x49, 0x6D, 0x8B, 0xD1, 0x25, 0x72, 0xF8, 0xF6, + 0x64, 0x86, 0x68, 0x98, 0x16, 0xD4, 0xA4, 0x5C, 0xCC, 0x5D, 0x65, 0xB6, 0x92, 0x6C, 0x70, 0x48, 0x50, 0xFD, + 0xED, 0xB9, 0xDA, 0x5E, 0x15, 0x46, 0x57, 0xA7, 0x8D, 0x9D, 0x84, 0x90, 0xD8, 0xAB, 0x00, 0x8C, 0xBC, 0xD3, + 0x0A, 0xF7, 0xE4, 0x58, 0x05, 0xB8, 0xB3, 0x45, 0x06, 0xD0, 0x2C, 0x1E, 0x8F, 0xCA, 0x3F, 0x0F, 0x02, 0xC1, + 0xAF, 0xBD, 0x03, 0x01, 0x13, 0x8A, 0x6B, 0x3A, 0x91, 0x11, 0x41, 0x4F, 0x67, 0xDC, 0xEA, 0x97, 0xF2, 0xCF, + 0xCE, 0xF0, 0xB4, 0xE6, 0x73, 0x96, 0xAC, 0x74, 0x22, 0xE7, 0xAD, 0x35, 0x85, 0xE2, 0xF9, 0x37, 0xE8, 0x1C, + 0x75, 0xDF, 0x6E, 0x47, 0xF1, 0x1A, 0x71, 0x1D, 0x29, 0xC5, 0x89, 0x6F, 0xB7, 0x62, 0x0E, 0xAA, 0x18, 0xBE, + 0x1B, 0xFC, 0x56, 0x3E, 0x4B, 0xC6, 0xD2, 0x79, 0x20, 0x9A, 0xDB, 0xC0, 0xFE, 0x78, 0xCD, 0x5A, 0xF4, 0x1F, + 0xDD, 0xA8, 0x33, 0x88, 0x07, 0xC7, 0x31, 0xB1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xEC, 0x5F, 0x60, 0x51, 0x7F, + 0xA9, 0x19, 0xB5, 0x4A, 0x0D, 0x2D, 0xE5, 0x7A, 0x9F, 0x93, 0xC9, 0x9C, 0xEF, 0xA0, 0xE0, 0x3B, 0x4D, 0xAE, + 0x2A, 0xF5, 0xB0, 0xC8, 0xEB, 0xBB, 0x3C, 0x83, 0x53, 0x99, 0x61, 0x17, 0x2B, 0x04, 0x7E, 0xBA, 0x77, 0xD6, + 0x26, 0xE1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0C, 0x7D }; + + /* + * Precalculated lookup table for galois field multiplication by 2 used in + * the MixColums step during encryption. + */ + private static int[] mult2 = { 0x00, 0x02, 0x04, 0x06, 0x08, 0x0a, 0x0c, 0x0e, 0x10, 0x12, 0x14, 0x16, 0x18, 0x1a, + 0x1c, 0x1e, 0x20, 0x22, 0x24, 0x26, 0x28, 0x2a, 0x2c, 0x2e, 0x30, 0x32, 0x34, 0x36, 0x38, 0x3a, 0x3c, 0x3e, + 0x40, 0x42, 0x44, 0x46, 0x48, 0x4a, 0x4c, 0x4e, 0x50, 0x52, 0x54, 0x56, 0x58, 0x5a, 0x5c, 0x5e, 0x60, 0x62, + 0x64, 0x66, 0x68, 0x6a, 0x6c, 0x6e, 0x70, 0x72, 0x74, 0x76, 0x78, 0x7a, 0x7c, 0x7e, 0x80, 0x82, 0x84, 0x86, + 0x88, 0x8a, 0x8c, 0x8e, 0x90, 0x92, 0x94, 0x96, 0x98, 0x9a, 0x9c, 0x9e, 0xa0, 0xa2, 0xa4, 0xa6, 0xa8, 0xaa, + 0xac, 0xae, 0xb0, 0xb2, 0xb4, 0xb6, 0xb8, 0xba, 0xbc, 0xbe, 0xc0, 0xc2, 0xc4, 0xc6, 0xc8, 0xca, 0xcc, 0xce, + 0xd0, 0xd2, 0xd4, 0xd6, 0xd8, 0xda, 0xdc, 0xde, 0xe0, 0xe2, 0xe4, 0xe6, 0xe8, 0xea, 0xec, 0xee, 0xf0, 0xf2, + 0xf4, 0xf6, 0xf8, 0xfa, 0xfc, 0xfe, 0x1b, 0x19, 0x1f, 0x1d, 0x13, 0x11, 0x17, 0x15, 0x0b, 0x09, 0x0f, 0x0d, + 0x03, 0x01, 0x07, 0x05, 0x3b, 0x39, 0x3f, 0x3d, 0x33, 0x31, 0x37, 0x35, 0x2b, 0x29, 0x2f, 0x2d, 0x23, 0x21, + 0x27, 0x25, 0x5b, 0x59, 0x5f, 0x5d, 0x53, 0x51, 0x57, 0x55, 0x4b, 0x49, 0x4f, 0x4d, 0x43, 0x41, 0x47, 0x45, + 0x7b, 0x79, 0x7f, 0x7d, 0x73, 0x71, 0x77, 0x75, 0x6b, 0x69, 0x6f, 0x6d, 0x63, 0x61, 0x67, 0x65, 0x9b, 0x99, + 0x9f, 0x9d, 0x93, 0x91, 0x97, 0x95, 0x8b, 0x89, 0x8f, 0x8d, 0x83, 0x81, 0x87, 0x85, 0xbb, 0xb9, 0xbf, 0xbd, + 0xb3, 0xb1, 0xb7, 0xb5, 0xab, 0xa9, 0xaf, 0xad, 0xa3, 0xa1, 0xa7, 0xa5, 0xdb, 0xd9, 0xdf, 0xdd, 0xd3, 0xd1, + 0xd7, 0xd5, 0xcb, 0xc9, 0xcf, 0xcd, 0xc3, 0xc1, 0xc7, 0xc5, 0xfb, 0xf9, 0xff, 0xfd, 0xf3, 0xf1, 0xf7, 0xf5, + 0xeb, 0xe9, 0xef, 0xed, 0xe3, 0xe1, 0xe7, 0xe5 }; + + /* + * Precalculated lookup table for galois field multiplication by 3 used in + * the MixColums step during encryption. + */ + private static int[] mult3 = { 0x00, 0x03, 0x06, 0x05, 0x0c, 0x0f, 0x0a, 0x09, 0x18, 0x1b, 0x1e, 0x1d, 0x14, 0x17, + 0x12, 0x11, 0x30, 0x33, 0x36, 0x35, 0x3c, 0x3f, 0x3a, 0x39, 0x28, 0x2b, 0x2e, 0x2d, 0x24, 0x27, 0x22, 0x21, + 0x60, 0x63, 0x66, 0x65, 0x6c, 0x6f, 0x6a, 0x69, 0x78, 0x7b, 0x7e, 0x7d, 0x74, 0x77, 0x72, 0x71, 0x50, 0x53, + 0x56, 0x55, 0x5c, 0x5f, 0x5a, 0x59, 0x48, 0x4b, 0x4e, 0x4d, 0x44, 0x47, 0x42, 0x41, 0xc0, 0xc3, 0xc6, 0xc5, + 0xcc, 0xcf, 0xca, 0xc9, 0xd8, 0xdb, 0xde, 0xdd, 0xd4, 0xd7, 0xd2, 0xd1, 0xf0, 0xf3, 0xf6, 0xf5, 0xfc, 0xff, + 0xfa, 0xf9, 0xe8, 0xeb, 0xee, 0xed, 0xe4, 0xe7, 0xe2, 0xe1, 0xa0, 0xa3, 0xa6, 0xa5, 0xac, 0xaf, 0xaa, 0xa9, + 0xb8, 0xbb, 0xbe, 0xbd, 0xb4, 0xb7, 0xb2, 0xb1, 0x90, 0x93, 0x96, 0x95, 0x9c, 0x9f, 0x9a, 0x99, 0x88, 0x8b, + 0x8e, 0x8d, 0x84, 0x87, 0x82, 0x81, 0x9b, 0x98, 0x9d, 0x9e, 0x97, 0x94, 0x91, 0x92, 0x83, 0x80, 0x85, 0x86, + 0x8f, 0x8c, 0x89, 0x8a, 0xab, 0xa8, 0xad, 0xae, 0xa7, 0xa4, 0xa1, 0xa2, 0xb3, 0xb0, 0xb5, 0xb6, 0xbf, 0xbc, + 0xb9, 0xba, 0xfb, 0xf8, 0xfd, 0xfe, 0xf7, 0xf4, 0xf1, 0xf2, 0xe3, 0xe0, 0xe5, 0xe6, 0xef, 0xec, 0xe9, 0xea, + 0xcb, 0xc8, 0xcd, 0xce, 0xc7, 0xc4, 0xc1, 0xc2, 0xd3, 0xd0, 0xd5, 0xd6, 0xdf, 0xdc, 0xd9, 0xda, 0x5b, 0x58, + 0x5d, 0x5e, 0x57, 0x54, 0x51, 0x52, 0x43, 0x40, 0x45, 0x46, 0x4f, 0x4c, 0x49, 0x4a, 0x6b, 0x68, 0x6d, 0x6e, + 0x67, 0x64, 0x61, 0x62, 0x73, 0x70, 0x75, 0x76, 0x7f, 0x7c, 0x79, 0x7a, 0x3b, 0x38, 0x3d, 0x3e, 0x37, 0x34, + 0x31, 0x32, 0x23, 0x20, 0x25, 0x26, 0x2f, 0x2c, 0x29, 0x2a, 0x0b, 0x08, 0x0d, 0x0e, 0x07, 0x04, 0x01, 0x02, + 0x13, 0x10, 0x15, 0x16, 0x1f, 0x1c, 0x19, 0x1a }; + + /* + * Precalculated lookup table for galois field multiplication by 9 used in + * the MixColums step during decryption. + */ + private static int[] mult9 = { 0x00, 0x09, 0x12, 0x1b, 0x24, 0x2d, 0x36, 0x3f, 0x48, 0x41, 0x5a, 0x53, 0x6c, 0x65, + 0x7e, 0x77, 0x90, 0x99, 0x82, 0x8b, 0xb4, 0xbd, 0xa6, 0xaf, 0xd8, 0xd1, 0xca, 0xc3, 0xfc, 0xf5, 0xee, 0xe7, + 0x3b, 0x32, 0x29, 0x20, 0x1f, 0x16, 0x0d, 0x04, 0x73, 0x7a, 0x61, 0x68, 0x57, 0x5e, 0x45, 0x4c, 0xab, 0xa2, + 0xb9, 0xb0, 0x8f, 0x86, 0x9d, 0x94, 0xe3, 0xea, 0xf1, 0xf8, 0xc7, 0xce, 0xd5, 0xdc, 0x76, 0x7f, 0x64, 0x6d, + 0x52, 0x5b, 0x40, 0x49, 0x3e, 0x37, 0x2c, 0x25, 0x1a, 0x13, 0x08, 0x01, 0xe6, 0xef, 0xf4, 0xfd, 0xc2, 0xcb, + 0xd0, 0xd9, 0xae, 0xa7, 0xbc, 0xb5, 0x8a, 0x83, 0x98, 0x91, 0x4d, 0x44, 0x5f, 0x56, 0x69, 0x60, 0x7b, 0x72, + 0x05, 0x0c, 0x17, 0x1e, 0x21, 0x28, 0x33, 0x3a, 0xdd, 0xd4, 0xcf, 0xc6, 0xf9, 0xf0, 0xeb, 0xe2, 0x95, 0x9c, + 0x87, 0x8e, 0xb1, 0xb8, 0xa3, 0xaa, 0xec, 0xe5, 0xfe, 0xf7, 0xc8, 0xc1, 0xda, 0xd3, 0xa4, 0xad, 0xb6, 0xbf, + 0x80, 0x89, 0x92, 0x9b, 0x7c, 0x75, 0x6e, 0x67, 0x58, 0x51, 0x4a, 0x43, 0x34, 0x3d, 0x26, 0x2f, 0x10, 0x19, + 0x02, 0x0b, 0xd7, 0xde, 0xc5, 0xcc, 0xf3, 0xfa, 0xe1, 0xe8, 0x9f, 0x96, 0x8d, 0x84, 0xbb, 0xb2, 0xa9, 0xa0, + 0x47, 0x4e, 0x55, 0x5c, 0x63, 0x6a, 0x71, 0x78, 0x0f, 0x06, 0x1d, 0x14, 0x2b, 0x22, 0x39, 0x30, 0x9a, 0x93, + 0x88, 0x81, 0xbe, 0xb7, 0xac, 0xa5, 0xd2, 0xdb, 0xc0, 0xc9, 0xf6, 0xff, 0xe4, 0xed, 0x0a, 0x03, 0x18, 0x11, + 0x2e, 0x27, 0x3c, 0x35, 0x42, 0x4b, 0x50, 0x59, 0x66, 0x6f, 0x74, 0x7d, 0xa1, 0xa8, 0xb3, 0xba, 0x85, 0x8c, + 0x97, 0x9e, 0xe9, 0xe0, 0xfb, 0xf2, 0xcd, 0xc4, 0xdf, 0xd6, 0x31, 0x38, 0x23, 0x2a, 0x15, 0x1c, 0x07, 0x0e, + 0x79, 0x70, 0x6b, 0x62, 0x5d, 0x54, 0x4f, 0x46 }; + + /* + * Precalculated lookup table for galois field multiplication by 11 used in + * the MixColums step during decryption. + */ + private static int[] mult11 = { 0x00, 0x0b, 0x16, 0x1d, 0x2c, 0x27, 0x3a, 0x31, 0x58, 0x53, 0x4e, 0x45, 0x74, 0x7f, + 0x62, 0x69, 0xb0, 0xbb, 0xa6, 0xad, 0x9c, 0x97, 0x8a, 0x81, 0xe8, 0xe3, 0xfe, 0xf5, 0xc4, 0xcf, 0xd2, 0xd9, + 0x7b, 0x70, 0x6d, 0x66, 0x57, 0x5c, 0x41, 0x4a, 0x23, 0x28, 0x35, 0x3e, 0x0f, 0x04, 0x19, 0x12, 0xcb, 0xc0, + 0xdd, 0xd6, 0xe7, 0xec, 0xf1, 0xfa, 0x93, 0x98, 0x85, 0x8e, 0xbf, 0xb4, 0xa9, 0xa2, 0xf6, 0xfd, 0xe0, 0xeb, + 0xda, 0xd1, 0xcc, 0xc7, 0xae, 0xa5, 0xb8, 0xb3, 0x82, 0x89, 0x94, 0x9f, 0x46, 0x4d, 0x50, 0x5b, 0x6a, 0x61, + 0x7c, 0x77, 0x1e, 0x15, 0x08, 0x03, 0x32, 0x39, 0x24, 0x2f, 0x8d, 0x86, 0x9b, 0x90, 0xa1, 0xaa, 0xb7, 0xbc, + 0xd5, 0xde, 0xc3, 0xc8, 0xf9, 0xf2, 0xef, 0xe4, 0x3d, 0x36, 0x2b, 0x20, 0x11, 0x1a, 0x07, 0x0c, 0x65, 0x6e, + 0x73, 0x78, 0x49, 0x42, 0x5f, 0x54, 0xf7, 0xfc, 0xe1, 0xea, 0xdb, 0xd0, 0xcd, 0xc6, 0xaf, 0xa4, 0xb9, 0xb2, + 0x83, 0x88, 0x95, 0x9e, 0x47, 0x4c, 0x51, 0x5a, 0x6b, 0x60, 0x7d, 0x76, 0x1f, 0x14, 0x09, 0x02, 0x33, 0x38, + 0x25, 0x2e, 0x8c, 0x87, 0x9a, 0x91, 0xa0, 0xab, 0xb6, 0xbd, 0xd4, 0xdf, 0xc2, 0xc9, 0xf8, 0xf3, 0xee, 0xe5, + 0x3c, 0x37, 0x2a, 0x21, 0x10, 0x1b, 0x06, 0x0d, 0x64, 0x6f, 0x72, 0x79, 0x48, 0x43, 0x5e, 0x55, 0x01, 0x0a, + 0x17, 0x1c, 0x2d, 0x26, 0x3b, 0x30, 0x59, 0x52, 0x4f, 0x44, 0x75, 0x7e, 0x63, 0x68, 0xb1, 0xba, 0xa7, 0xac, + 0x9d, 0x96, 0x8b, 0x80, 0xe9, 0xe2, 0xff, 0xf4, 0xc5, 0xce, 0xd3, 0xd8, 0x7a, 0x71, 0x6c, 0x67, 0x56, 0x5d, + 0x40, 0x4b, 0x22, 0x29, 0x34, 0x3f, 0x0e, 0x05, 0x18, 0x13, 0xca, 0xc1, 0xdc, 0xd7, 0xe6, 0xed, 0xf0, 0xfb, + 0x92, 0x99, 0x84, 0x8f, 0xbe, 0xb5, 0xa8, 0xa3 }; + + /* + * Precalculated lookup table for galois field multiplication by 13 used in + * the MixColums step during decryption. + */ + private static int[] mult13 = { 0x00, 0x0d, 0x1a, 0x17, 0x34, 0x39, 0x2e, 0x23, 0x68, 0x65, 0x72, 0x7f, 0x5c, 0x51, + 0x46, 0x4b, 0xd0, 0xdd, 0xca, 0xc7, 0xe4, 0xe9, 0xfe, 0xf3, 0xb8, 0xb5, 0xa2, 0xaf, 0x8c, 0x81, 0x96, 0x9b, + 0xbb, 0xb6, 0xa1, 0xac, 0x8f, 0x82, 0x95, 0x98, 0xd3, 0xde, 0xc9, 0xc4, 0xe7, 0xea, 0xfd, 0xf0, 0x6b, 0x66, + 0x71, 0x7c, 0x5f, 0x52, 0x45, 0x48, 0x03, 0x0e, 0x19, 0x14, 0x37, 0x3a, 0x2d, 0x20, 0x6d, 0x60, 0x77, 0x7a, + 0x59, 0x54, 0x43, 0x4e, 0x05, 0x08, 0x1f, 0x12, 0x31, 0x3c, 0x2b, 0x26, 0xbd, 0xb0, 0xa7, 0xaa, 0x89, 0x84, + 0x93, 0x9e, 0xd5, 0xd8, 0xcf, 0xc2, 0xe1, 0xec, 0xfb, 0xf6, 0xd6, 0xdb, 0xcc, 0xc1, 0xe2, 0xef, 0xf8, 0xf5, + 0xbe, 0xb3, 0xa4, 0xa9, 0x8a, 0x87, 0x90, 0x9d, 0x06, 0x0b, 0x1c, 0x11, 0x32, 0x3f, 0x28, 0x25, 0x6e, 0x63, + 0x74, 0x79, 0x5a, 0x57, 0x40, 0x4d, 0xda, 0xd7, 0xc0, 0xcd, 0xee, 0xe3, 0xf4, 0xf9, 0xb2, 0xbf, 0xa8, 0xa5, + 0x86, 0x8b, 0x9c, 0x91, 0x0a, 0x07, 0x10, 0x1d, 0x3e, 0x33, 0x24, 0x29, 0x62, 0x6f, 0x78, 0x75, 0x56, 0x5b, + 0x4c, 0x41, 0x61, 0x6c, 0x7b, 0x76, 0x55, 0x58, 0x4f, 0x42, 0x09, 0x04, 0x13, 0x1e, 0x3d, 0x30, 0x27, 0x2a, + 0xb1, 0xbc, 0xab, 0xa6, 0x85, 0x88, 0x9f, 0x92, 0xd9, 0xd4, 0xc3, 0xce, 0xed, 0xe0, 0xf7, 0xfa, 0xb7, 0xba, + 0xad, 0xa0, 0x83, 0x8e, 0x99, 0x94, 0xdf, 0xd2, 0xc5, 0xc8, 0xeb, 0xe6, 0xf1, 0xfc, 0x67, 0x6a, 0x7d, 0x70, + 0x53, 0x5e, 0x49, 0x44, 0x0f, 0x02, 0x15, 0x18, 0x3b, 0x36, 0x21, 0x2c, 0x0c, 0x01, 0x16, 0x1b, 0x38, 0x35, + 0x22, 0x2f, 0x64, 0x69, 0x7e, 0x73, 0x50, 0x5d, 0x4a, 0x47, 0xdc, 0xd1, 0xc6, 0xcb, 0xe8, 0xe5, 0xf2, 0xff, + 0xb4, 0xb9, 0xae, 0xa3, 0x80, 0x8d, 0x9a, 0x97 }; + + /* + * Precalculated lookup table for galois field multiplication by 14 used in + * the MixColums step during decryption. + */ + private static int[] mult14 = { 0x00, 0x0e, 0x1c, 0x12, 0x38, 0x36, 0x24, 0x2a, 0x70, 0x7e, 0x6c, 0x62, 0x48, 0x46, + 0x54, 0x5a, 0xe0, 0xee, 0xfc, 0xf2, 0xd8, 0xd6, 0xc4, 0xca, 0x90, 0x9e, 0x8c, 0x82, 0xa8, 0xa6, 0xb4, 0xba, + 0xdb, 0xd5, 0xc7, 0xc9, 0xe3, 0xed, 0xff, 0xf1, 0xab, 0xa5, 0xb7, 0xb9, 0x93, 0x9d, 0x8f, 0x81, 0x3b, 0x35, + 0x27, 0x29, 0x03, 0x0d, 0x1f, 0x11, 0x4b, 0x45, 0x57, 0x59, 0x73, 0x7d, 0x6f, 0x61, 0xad, 0xa3, 0xb1, 0xbf, + 0x95, 0x9b, 0x89, 0x87, 0xdd, 0xd3, 0xc1, 0xcf, 0xe5, 0xeb, 0xf9, 0xf7, 0x4d, 0x43, 0x51, 0x5f, 0x75, 0x7b, + 0x69, 0x67, 0x3d, 0x33, 0x21, 0x2f, 0x05, 0x0b, 0x19, 0x17, 0x76, 0x78, 0x6a, 0x64, 0x4e, 0x40, 0x52, 0x5c, + 0x06, 0x08, 0x1a, 0x14, 0x3e, 0x30, 0x22, 0x2c, 0x96, 0x98, 0x8a, 0x84, 0xae, 0xa0, 0xb2, 0xbc, 0xe6, 0xe8, + 0xfa, 0xf4, 0xde, 0xd0, 0xc2, 0xcc, 0x41, 0x4f, 0x5d, 0x53, 0x79, 0x77, 0x65, 0x6b, 0x31, 0x3f, 0x2d, 0x23, + 0x09, 0x07, 0x15, 0x1b, 0xa1, 0xaf, 0xbd, 0xb3, 0x99, 0x97, 0x85, 0x8b, 0xd1, 0xdf, 0xcd, 0xc3, 0xe9, 0xe7, + 0xf5, 0xfb, 0x9a, 0x94, 0x86, 0x88, 0xa2, 0xac, 0xbe, 0xb0, 0xea, 0xe4, 0xf6, 0xf8, 0xd2, 0xdc, 0xce, 0xc0, + 0x7a, 0x74, 0x66, 0x68, 0x42, 0x4c, 0x5e, 0x50, 0x0a, 0x04, 0x16, 0x18, 0x32, 0x3c, 0x2e, 0x20, 0xec, 0xe2, + 0xf0, 0xfe, 0xd4, 0xda, 0xc8, 0xc6, 0x9c, 0x92, 0x80, 0x8e, 0xa4, 0xaa, 0xb8, 0xb6, 0x0c, 0x02, 0x10, 0x1e, + 0x34, 0x3a, 0x28, 0x26, 0x7c, 0x72, 0x60, 0x6e, 0x44, 0x4a, 0x58, 0x56, 0x37, 0x39, 0x2b, 0x25, 0x0f, 0x01, + 0x13, 0x1d, 0x47, 0x49, 0x5b, 0x55, 0x7f, 0x71, 0x63, 0x6d, 0xd7, 0xd9, 0xcb, 0xc5, 0xef, 0xe1, 0xf3, 0xfd, + 0xa7, 0xa9, 0xbb, 0xb5, 0x9f, 0x91, 0x83, 0x8d }; + + /* + * Subroutine of the Rijndael key expansion. + */ + private static BigInteger scheduleCore(BigInteger t, int rconCounter){ + String rBytes = t.toString(16); + + // Add zero padding + while(rBytes.length() < 8){ + rBytes = "0" + rBytes; + } + + // rotate the first 16 bits to the back + String rotatingBytes = rBytes.substring(0, 2); + String fixedBytes = rBytes.substring(2); + + rBytes = fixedBytes + rotatingBytes; + + // apply S-Box to all 8-Bit Substrings + for(int i = 0;i < 4;i++){ + String currentByteBits = rBytes.substring(i*2, (i+1)*2); + + int currentByte = Integer.parseInt(currentByteBits, 16); + currentByte = sBox[currentByte]; + + // add the current rcon value to the first byte + if(i == 0){ + currentByte = currentByte ^ rcon[rconCounter]; + } + + currentByteBits = Integer.toHexString(currentByte); + + // Add zero padding + while(currentByteBits.length() < 2){ + currentByteBits = "0" + currentByteBits; + } + + // replace bytes in original string + rBytes = rBytes.substring(0,i*2)+currentByteBits+rBytes.substring((i+1)*2); + } + + t = new BigInteger(rBytes,16); + + return t; + } + + /* + * Returns an array of 10 + 1 round keys that are calcualted by using + * Rijndael key schedule + */ + private static BigInteger[] keyExpansion(BigInteger initialKey) { + BigInteger[] roundKeys = { initialKey, new BigInteger("0"), new BigInteger("0"), new BigInteger("0"), new BigInteger("0"), new BigInteger("0"), new BigInteger("0"), + new BigInteger("0"), new BigInteger("0"), new BigInteger("0"), new BigInteger("0"), }; + + for(int i = 1 ; i < 11;i++){ + + // get the previous 32 bits the key + BigInteger t = roundKeys[i-1].remainder(new BigInteger("100000000",16)); + + // initialize rcon iteration + int rconCounter = 1; + + // schedule core + t = scheduleCore(t,rconCounter); + rconCounter += 1; + BigInteger t1 = t.multiply(new BigInteger("100000000",16)); + BigInteger t2 = t.multiply(new BigInteger("10000000000000000",16)); + BigInteger t3 = t.multiply(new BigInteger("1000000000000000000000000",16)); + t = t.add(t1).add(t2).add(t3); + + BigInteger xorMask = roundKeys[i-1].divide(new BigInteger("100000000",16)); + xorMask = xorMask.multiply(new BigInteger("100000000",16)); + t = t.xor(xorMask); + roundKeys[i] = t; + + } + return roundKeys; + } + + /* + * Returns a representation of the input 128-bit block as an array of 8-bit + * integers. + */ + private static int[] splitBlockIntoCells(BigInteger block) { + + int[] cells = new int[16]; + String blockBits = block.toString(2); + + // Append leading 0 for full "128-bit" string + while (blockBits.length() < 128) { + blockBits = "0" + blockBits; + } + + for (int i = 0; i < 16; i++) { + String cellBits = blockBits.substring(8 * i, 8 * (i + 1)); + cells[i] = Integer.parseInt(cellBits, 2); + } + + return cells; + } + + /* + * Returns the 128-bit BigInteger representation of the input of an array of + * 8-bit integers. + */ + private static BigInteger mergeCellsIntoBlock(int[] cells) { + + String blockBits = ""; + for (int i = 0; i < 16; i++) { + String cellBits = Integer.toBinaryString(cells[i]); + + // Append leading 0 for full "8-bit" strings + while (cellBits.length() < 8) { + cellBits = "0" + cellBits; + } + + blockBits += cellBits; + } + + return new BigInteger(blockBits, 2); + } + + /* + * Returns ciphertext XOR key + */ + private static BigInteger addRoundKey(BigInteger ciphertext, BigInteger key) { + return ciphertext.xor(key); + } + + /* + * substitutes 8-Bit long substrings of the input using the S-Box and + * returns the result. + */ + private static BigInteger subBytes(BigInteger ciphertext) { + + int[] cells = splitBlockIntoCells(ciphertext); + + for (int i = 0; i < 16; i++) { + cells[i] = sBox[cells[i]]; + } + + return mergeCellsIntoBlock(cells); + } + + /* + * substitutes 8-Bit long substrings of the input using + * the inverse S-Box for decryption and returns the result. + */ + private static BigInteger subBytesDec(BigInteger ciphertext) { + + int[] cells = splitBlockIntoCells(ciphertext); + + for (int i = 0; i < 16; i++) { + cells[i] = inverseSBox[cells[i]]; + } + + return mergeCellsIntoBlock(cells); + } + + /* + * Cell permutation step. Shifts cells within the rows of the input and + * returns the result. + */ + private static BigInteger shiftRows(BigInteger ciphertext) { + int[] cells = splitBlockIntoCells(ciphertext); + int[] output = new int[16]; + + // do nothing in the first row + output[0] = cells[0]; + output[1] = cells[1]; + output[2] = cells[2]; + output[3] = cells[3]; + + // shift the second row backwards by one cell + output[4] = cells[5]; + output[5] = cells[6]; + output[6] = cells[7]; + output[7] = cells[4]; + + // shift the third row backwards by two cell + output[8] = cells[10]; + output[9] = cells[11]; + output[10] = cells[8]; + output[11] = cells[9]; + + // shift the forth row backwards by tree cell + output[12] = cells[15]; + output[13] = cells[12]; + output[14] = cells[13]; + output[15] = cells[14]; + + return mergeCellsIntoBlock(output); + } + + /* + * Cell permutation step for decryption . + * Shifts cells within the rows of the input and returns the result. + */ + private static BigInteger shiftRowsDec(BigInteger ciphertext) { + int[] cells = splitBlockIntoCells(ciphertext); + int[] output = new int[16]; + + // do nothing in the first row + output[0] = cells[0]; + output[1] = cells[1]; + output[2] = cells[2]; + output[3] = cells[3]; + + // shift the second row forwards by one cell + output[4] = cells[7]; + output[5] = cells[4]; + output[6] = cells[5]; + output[7] = cells[6]; + + // shift the third row forwards by two cell + output[8] = cells[10]; + output[9] = cells[11]; + output[10] = cells[8]; + output[11] = cells[9]; + + // shift the forth row forwards by tree cell + output[12] = cells[13]; + output[13] = cells[14]; + output[14] = cells[15]; + output[15] = cells[12]; + + return mergeCellsIntoBlock(output); + } + /* + * Applies the Rijndael MixColumns to the + * input and returns the result. + */ + private static BigInteger mixColumns(BigInteger ciphertext) { + + int[] cells = splitBlockIntoCells(ciphertext); + int[] outputCells = new int[16]; + + for (int i = 0; i < 4; i++) { + int[] row = { cells[i], cells[i + 4], cells[i + 8], cells[i + 12] }; + + outputCells[i] = mult2[row[0]] ^ mult3[row[1]] ^ row[2] ^ row[3]; + outputCells[i + 4] = row[0] ^ mult2[row[1]] ^ mult3[row[2]] ^ row[3]; + outputCells[i + 8] = row[0] ^ row[1] ^ mult2[row[2]] ^ mult3[row[3]]; + outputCells[i + 12] = mult3[row[0]] ^ row[1] ^ row[2] ^ mult2[row[3]]; + } + return mergeCellsIntoBlock(outputCells); + } + + /* + * Applies the inverse Rijndael MixColumns + * for decryption to the input and returns the result. + */ + private static BigInteger mixColumnsDec(BigInteger ciphertext) { + + int[] cells = splitBlockIntoCells(ciphertext); + int[] outputCells = new int[16]; + + for (int i = 0; i < 4; i++) { + int[] row = { cells[i], cells[i + 4], cells[i + 8], cells[i + 12] }; + + outputCells[i] = mult14[row[0]] ^ mult11[row[1]] ^ mult13[row[2]] ^ mult9[row[3]]; + outputCells[i + 4] = mult9[row[0]] ^ mult14[row[1]] ^ mult11[row[2]] ^ mult13[row[3]]; + outputCells[i + 8] = mult13[row[0]] ^ mult9[row[1]] ^ mult14[row[2]] ^ mult11[row[3]]; + outputCells[i + 12] = mult11[row[0]] ^ mult13[row[1]] ^ mult9[row[2]] ^ mult14[row[3]]; + } + return mergeCellsIntoBlock(outputCells); + } + + public static void main(String[] args) { + + boolean encrypt = false; + + BigInteger key = new BigInteger("ffffffffffffffffffffffffffffffff",16); + BigInteger[] roundKeys = keyExpansion(key); + + System.out.println(""); + + // Set plain- and ciphertext test values for key = 1465 + BigInteger plaintext = new BigInteger("e96681a693e2f3a33dff9f345dcbbf7f",16); + BigInteger ciphertext = new BigInteger("bc2da831201d8565e4f649cc36297a9b",16); + BigInteger output; + + if (encrypt) { + + // Initial round + plaintext = addRoundKey(plaintext, roundKeys[0]); + + // Main rounds + for (int i = 1; i < 10; i++) { + plaintext = subBytes(plaintext); + plaintext = shiftRows(plaintext); + plaintext = mixColumns(plaintext); + plaintext = addRoundKey(plaintext, roundKeys[i]); + } + + // Final round + plaintext = subBytes(plaintext); + plaintext = shiftRows(plaintext); + plaintext = addRoundKey(plaintext, roundKeys[10]); + + output = plaintext; + + } else { + + // Invert final round + ciphertext = addRoundKey(ciphertext, roundKeys[10]); + ciphertext = shiftRowsDec(ciphertext); + ciphertext = subBytesDec(ciphertext); + + // Invert main rounds + for (int i = 9; i > 0; i--) { + ciphertext = addRoundKey(ciphertext, roundKeys[i]); + ciphertext = mixColumnsDec(ciphertext); + ciphertext = shiftRowsDec(ciphertext); + ciphertext = subBytesDec(ciphertext); + } + + // Invert initial round + ciphertext = addRoundKey(ciphertext, roundKeys[0]); + + output = ciphertext; + } + + System.out.println(output.toString(16)); + + } + +} From 20942056088c7273f895ed10b22c14636fa43968 Mon Sep 17 00:00:00 2001 From: Phil-Schmidt Date: Mon, 20 Nov 2017 06:15:27 +0100 Subject: [PATCH 2/4] Tests and bugfix Added Unittests for AES and AES subroutines. Transposed the matrix representation of the block into the correct position. --- ciphers/AES.java | 529 +++++++++++++++++++++++++++++++++++++++++++ ciphers/AESTest.java | 87 +++++++ 2 files changed, 616 insertions(+) create mode 100644 ciphers/AES.java create mode 100644 ciphers/AESTest.java diff --git a/ciphers/AES.java b/ciphers/AES.java new file mode 100644 index 000000000000..2323e09fcae8 --- /dev/null +++ b/ciphers/AES.java @@ -0,0 +1,529 @@ +package ciphers; + +import java.math.BigInteger; + +/* This class is build to demonstrate the + * apllication of the AES-algorithm on + * a single 128-Bit block of data. + * */ +public class AES { + + /* + * Precalculated values for x to the power of 2 in Rijndaels galois field. + * Used as 'rcon' in during the key expansion. + */ + private static int[] rcon = { 0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36, 0x6c, 0xd8, 0xab, + 0x4d, 0x9a, 0x2f, 0x5e, 0xbc, 0x63, 0xc6, 0x97, 0x35, 0x6a, 0xd4, 0xb3, 0x7d, 0xfa, 0xef, 0xc5, 0x91, 0x39, + 0x72, 0xe4, 0xd3, 0xbd, 0x61, 0xc2, 0x9f, 0x25, 0x4a, 0x94, 0x33, 0x66, 0xcc, 0x83, 0x1d, 0x3a, 0x74, 0xe8, + 0xcb, 0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36, 0x6c, 0xd8, 0xab, 0x4d, 0x9a, 0x2f, + 0x5e, 0xbc, 0x63, 0xc6, 0x97, 0x35, 0x6a, 0xd4, 0xb3, 0x7d, 0xfa, 0xef, 0xc5, 0x91, 0x39, 0x72, 0xe4, 0xd3, + 0xbd, 0x61, 0xc2, 0x9f, 0x25, 0x4a, 0x94, 0x33, 0x66, 0xcc, 0x83, 0x1d, 0x3a, 0x74, 0xe8, 0xcb, 0x8d, 0x01, + 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36, 0x6c, 0xd8, 0xab, 0x4d, 0x9a, 0x2f, 0x5e, 0xbc, 0x63, + 0xc6, 0x97, 0x35, 0x6a, 0xd4, 0xb3, 0x7d, 0xfa, 0xef, 0xc5, 0x91, 0x39, 0x72, 0xe4, 0xd3, 0xbd, 0x61, 0xc2, + 0x9f, 0x25, 0x4a, 0x94, 0x33, 0x66, 0xcc, 0x83, 0x1d, 0x3a, 0x74, 0xe8, 0xcb, 0x8d, 0x01, 0x02, 0x04, 0x08, + 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36, 0x6c, 0xd8, 0xab, 0x4d, 0x9a, 0x2f, 0x5e, 0xbc, 0x63, 0xc6, 0x97, 0x35, + 0x6a, 0xd4, 0xb3, 0x7d, 0xfa, 0xef, 0xc5, 0x91, 0x39, 0x72, 0xe4, 0xd3, 0xbd, 0x61, 0xc2, 0x9f, 0x25, 0x4a, + 0x94, 0x33, 0x66, 0xcc, 0x83, 0x1d, 0x3a, 0x74, 0xe8, 0xcb, 0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, + 0x80, 0x1b, 0x36, 0x6c, 0xd8, 0xab, 0x4d, 0x9a, 0x2f, 0x5e, 0xbc, 0x63, 0xc6, 0x97, 0x35, 0x6a, 0xd4, 0xb3, + 0x7d, 0xfa, 0xef, 0xc5, 0x91, 0x39, 0x72, 0xe4, 0xd3, 0xbd, 0x61, 0xc2, 0x9f, 0x25, 0x4a, 0x94, 0x33, 0x66, + 0xcc, 0x83, 0x1d, 0x3a, 0x74, 0xe8, 0xcb, 0x8d }; + + /* + * Rijndael S-box Substitution table used for encryption in the subBytes + * step, as well as the key expansion. + */ + private static int[] sBox = { 0x63, 0x7C, 0x77, 0x7B, 0xF2, 0x6B, 0x6F, 0xC5, 0x30, 0x01, 0x67, 0x2B, 0xFE, 0xD7, + 0xAB, 0x76, 0xCA, 0x82, 0xC9, 0x7D, 0xFA, 0x59, 0x47, 0xF0, 0xAD, 0xD4, 0xA2, 0xAF, 0x9C, 0xA4, 0x72, 0xC0, + 0xB7, 0xFD, 0x93, 0x26, 0x36, 0x3F, 0xF7, 0xCC, 0x34, 0xA5, 0xE5, 0xF1, 0x71, 0xD8, 0x31, 0x15, 0x04, 0xC7, + 0x23, 0xC3, 0x18, 0x96, 0x05, 0x9A, 0x07, 0x12, 0x80, 0xE2, 0xEB, 0x27, 0xB2, 0x75, 0x09, 0x83, 0x2C, 0x1A, + 0x1B, 0x6E, 0x5A, 0xA0, 0x52, 0x3B, 0xD6, 0xB3, 0x29, 0xE3, 0x2F, 0x84, 0x53, 0xD1, 0x00, 0xED, 0x20, 0xFC, + 0xB1, 0x5B, 0x6A, 0xCB, 0xBE, 0x39, 0x4A, 0x4C, 0x58, 0xCF, 0xD0, 0xEF, 0xAA, 0xFB, 0x43, 0x4D, 0x33, 0x85, + 0x45, 0xF9, 0x02, 0x7F, 0x50, 0x3C, 0x9F, 0xA8, 0x51, 0xA3, 0x40, 0x8F, 0x92, 0x9D, 0x38, 0xF5, 0xBC, 0xB6, + 0xDA, 0x21, 0x10, 0xFF, 0xF3, 0xD2, 0xCD, 0x0C, 0x13, 0xEC, 0x5F, 0x97, 0x44, 0x17, 0xC4, 0xA7, 0x7E, 0x3D, + 0x64, 0x5D, 0x19, 0x73, 0x60, 0x81, 0x4F, 0xDC, 0x22, 0x2A, 0x90, 0x88, 0x46, 0xEE, 0xB8, 0x14, 0xDE, 0x5E, + 0x0B, 0xDB, 0xE0, 0x32, 0x3A, 0x0A, 0x49, 0x06, 0x24, 0x5C, 0xC2, 0xD3, 0xAC, 0x62, 0x91, 0x95, 0xE4, 0x79, + 0xE7, 0xC8, 0x37, 0x6D, 0x8D, 0xD5, 0x4E, 0xA9, 0x6C, 0x56, 0xF4, 0xEA, 0x65, 0x7A, 0xAE, 0x08, 0xBA, 0x78, + 0x25, 0x2E, 0x1C, 0xA6, 0xB4, 0xC6, 0xE8, 0xDD, 0x74, 0x1F, 0x4B, 0xBD, 0x8B, 0x8A, 0x70, 0x3E, 0xB5, 0x66, + 0x48, 0x03, 0xF6, 0x0E, 0x61, 0x35, 0x57, 0xB9, 0x86, 0xC1, 0x1D, 0x9E, 0xE1, 0xF8, 0x98, 0x11, 0x69, 0xD9, + 0x8E, 0x94, 0x9B, 0x1E, 0x87, 0xE9, 0xCE, 0x55, 0x28, 0xDF, 0x8C, 0xA1, 0x89, 0x0D, 0xBF, 0xE6, 0x42, 0x68, + 0x41, 0x99, 0x2D, 0x0F, 0xB0, 0x54, 0xBB, 0x16 }; + + /* + * Inverse Rijndael S-box Substitution table used for decryption in the + * subBytesDec step + */ + private static int[] inverseSBox = { 0x52, 0x09, 0x6A, 0xD5, 0x30, 0x36, 0xA5, 0x38, 0xBF, 0x40, 0xA3, 0x9E, 0x81, + 0xF3, 0xD7, 0xFB, 0x7C, 0xE3, 0x39, 0x82, 0x9B, 0x2F, 0xFF, 0x87, 0x34, 0x8E, 0x43, 0x44, 0xC4, 0xDE, 0xE9, + 0xCB, 0x54, 0x7B, 0x94, 0x32, 0xA6, 0xC2, 0x23, 0x3D, 0xEE, 0x4C, 0x95, 0x0B, 0x42, 0xFA, 0xC3, 0x4E, 0x08, + 0x2E, 0xA1, 0x66, 0x28, 0xD9, 0x24, 0xB2, 0x76, 0x5B, 0xA2, 0x49, 0x6D, 0x8B, 0xD1, 0x25, 0x72, 0xF8, 0xF6, + 0x64, 0x86, 0x68, 0x98, 0x16, 0xD4, 0xA4, 0x5C, 0xCC, 0x5D, 0x65, 0xB6, 0x92, 0x6C, 0x70, 0x48, 0x50, 0xFD, + 0xED, 0xB9, 0xDA, 0x5E, 0x15, 0x46, 0x57, 0xA7, 0x8D, 0x9D, 0x84, 0x90, 0xD8, 0xAB, 0x00, 0x8C, 0xBC, 0xD3, + 0x0A, 0xF7, 0xE4, 0x58, 0x05, 0xB8, 0xB3, 0x45, 0x06, 0xD0, 0x2C, 0x1E, 0x8F, 0xCA, 0x3F, 0x0F, 0x02, 0xC1, + 0xAF, 0xBD, 0x03, 0x01, 0x13, 0x8A, 0x6B, 0x3A, 0x91, 0x11, 0x41, 0x4F, 0x67, 0xDC, 0xEA, 0x97, 0xF2, 0xCF, + 0xCE, 0xF0, 0xB4, 0xE6, 0x73, 0x96, 0xAC, 0x74, 0x22, 0xE7, 0xAD, 0x35, 0x85, 0xE2, 0xF9, 0x37, 0xE8, 0x1C, + 0x75, 0xDF, 0x6E, 0x47, 0xF1, 0x1A, 0x71, 0x1D, 0x29, 0xC5, 0x89, 0x6F, 0xB7, 0x62, 0x0E, 0xAA, 0x18, 0xBE, + 0x1B, 0xFC, 0x56, 0x3E, 0x4B, 0xC6, 0xD2, 0x79, 0x20, 0x9A, 0xDB, 0xC0, 0xFE, 0x78, 0xCD, 0x5A, 0xF4, 0x1F, + 0xDD, 0xA8, 0x33, 0x88, 0x07, 0xC7, 0x31, 0xB1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xEC, 0x5F, 0x60, 0x51, 0x7F, + 0xA9, 0x19, 0xB5, 0x4A, 0x0D, 0x2D, 0xE5, 0x7A, 0x9F, 0x93, 0xC9, 0x9C, 0xEF, 0xA0, 0xE0, 0x3B, 0x4D, 0xAE, + 0x2A, 0xF5, 0xB0, 0xC8, 0xEB, 0xBB, 0x3C, 0x83, 0x53, 0x99, 0x61, 0x17, 0x2B, 0x04, 0x7E, 0xBA, 0x77, 0xD6, + 0x26, 0xE1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0C, 0x7D }; + + /* + * Precalculated lookup table for galois field multiplication by 2 used in + * the MixColums step during encryption. + */ + private static int[] mult2 = { 0x00, 0x02, 0x04, 0x06, 0x08, 0x0a, 0x0c, 0x0e, 0x10, 0x12, 0x14, 0x16, 0x18, 0x1a, + 0x1c, 0x1e, 0x20, 0x22, 0x24, 0x26, 0x28, 0x2a, 0x2c, 0x2e, 0x30, 0x32, 0x34, 0x36, 0x38, 0x3a, 0x3c, 0x3e, + 0x40, 0x42, 0x44, 0x46, 0x48, 0x4a, 0x4c, 0x4e, 0x50, 0x52, 0x54, 0x56, 0x58, 0x5a, 0x5c, 0x5e, 0x60, 0x62, + 0x64, 0x66, 0x68, 0x6a, 0x6c, 0x6e, 0x70, 0x72, 0x74, 0x76, 0x78, 0x7a, 0x7c, 0x7e, 0x80, 0x82, 0x84, 0x86, + 0x88, 0x8a, 0x8c, 0x8e, 0x90, 0x92, 0x94, 0x96, 0x98, 0x9a, 0x9c, 0x9e, 0xa0, 0xa2, 0xa4, 0xa6, 0xa8, 0xaa, + 0xac, 0xae, 0xb0, 0xb2, 0xb4, 0xb6, 0xb8, 0xba, 0xbc, 0xbe, 0xc0, 0xc2, 0xc4, 0xc6, 0xc8, 0xca, 0xcc, 0xce, + 0xd0, 0xd2, 0xd4, 0xd6, 0xd8, 0xda, 0xdc, 0xde, 0xe0, 0xe2, 0xe4, 0xe6, 0xe8, 0xea, 0xec, 0xee, 0xf0, 0xf2, + 0xf4, 0xf6, 0xf8, 0xfa, 0xfc, 0xfe, 0x1b, 0x19, 0x1f, 0x1d, 0x13, 0x11, 0x17, 0x15, 0x0b, 0x09, 0x0f, 0x0d, + 0x03, 0x01, 0x07, 0x05, 0x3b, 0x39, 0x3f, 0x3d, 0x33, 0x31, 0x37, 0x35, 0x2b, 0x29, 0x2f, 0x2d, 0x23, 0x21, + 0x27, 0x25, 0x5b, 0x59, 0x5f, 0x5d, 0x53, 0x51, 0x57, 0x55, 0x4b, 0x49, 0x4f, 0x4d, 0x43, 0x41, 0x47, 0x45, + 0x7b, 0x79, 0x7f, 0x7d, 0x73, 0x71, 0x77, 0x75, 0x6b, 0x69, 0x6f, 0x6d, 0x63, 0x61, 0x67, 0x65, 0x9b, 0x99, + 0x9f, 0x9d, 0x93, 0x91, 0x97, 0x95, 0x8b, 0x89, 0x8f, 0x8d, 0x83, 0x81, 0x87, 0x85, 0xbb, 0xb9, 0xbf, 0xbd, + 0xb3, 0xb1, 0xb7, 0xb5, 0xab, 0xa9, 0xaf, 0xad, 0xa3, 0xa1, 0xa7, 0xa5, 0xdb, 0xd9, 0xdf, 0xdd, 0xd3, 0xd1, + 0xd7, 0xd5, 0xcb, 0xc9, 0xcf, 0xcd, 0xc3, 0xc1, 0xc7, 0xc5, 0xfb, 0xf9, 0xff, 0xfd, 0xf3, 0xf1, 0xf7, 0xf5, + 0xeb, 0xe9, 0xef, 0xed, 0xe3, 0xe1, 0xe7, 0xe5 }; + + /* + * Precalculated lookup table for galois field multiplication by 3 used in + * the MixColums step during encryption. + */ + private static int[] mult3 = { 0x00, 0x03, 0x06, 0x05, 0x0c, 0x0f, 0x0a, 0x09, 0x18, 0x1b, 0x1e, 0x1d, 0x14, 0x17, + 0x12, 0x11, 0x30, 0x33, 0x36, 0x35, 0x3c, 0x3f, 0x3a, 0x39, 0x28, 0x2b, 0x2e, 0x2d, 0x24, 0x27, 0x22, 0x21, + 0x60, 0x63, 0x66, 0x65, 0x6c, 0x6f, 0x6a, 0x69, 0x78, 0x7b, 0x7e, 0x7d, 0x74, 0x77, 0x72, 0x71, 0x50, 0x53, + 0x56, 0x55, 0x5c, 0x5f, 0x5a, 0x59, 0x48, 0x4b, 0x4e, 0x4d, 0x44, 0x47, 0x42, 0x41, 0xc0, 0xc3, 0xc6, 0xc5, + 0xcc, 0xcf, 0xca, 0xc9, 0xd8, 0xdb, 0xde, 0xdd, 0xd4, 0xd7, 0xd2, 0xd1, 0xf0, 0xf3, 0xf6, 0xf5, 0xfc, 0xff, + 0xfa, 0xf9, 0xe8, 0xeb, 0xee, 0xed, 0xe4, 0xe7, 0xe2, 0xe1, 0xa0, 0xa3, 0xa6, 0xa5, 0xac, 0xaf, 0xaa, 0xa9, + 0xb8, 0xbb, 0xbe, 0xbd, 0xb4, 0xb7, 0xb2, 0xb1, 0x90, 0x93, 0x96, 0x95, 0x9c, 0x9f, 0x9a, 0x99, 0x88, 0x8b, + 0x8e, 0x8d, 0x84, 0x87, 0x82, 0x81, 0x9b, 0x98, 0x9d, 0x9e, 0x97, 0x94, 0x91, 0x92, 0x83, 0x80, 0x85, 0x86, + 0x8f, 0x8c, 0x89, 0x8a, 0xab, 0xa8, 0xad, 0xae, 0xa7, 0xa4, 0xa1, 0xa2, 0xb3, 0xb0, 0xb5, 0xb6, 0xbf, 0xbc, + 0xb9, 0xba, 0xfb, 0xf8, 0xfd, 0xfe, 0xf7, 0xf4, 0xf1, 0xf2, 0xe3, 0xe0, 0xe5, 0xe6, 0xef, 0xec, 0xe9, 0xea, + 0xcb, 0xc8, 0xcd, 0xce, 0xc7, 0xc4, 0xc1, 0xc2, 0xd3, 0xd0, 0xd5, 0xd6, 0xdf, 0xdc, 0xd9, 0xda, 0x5b, 0x58, + 0x5d, 0x5e, 0x57, 0x54, 0x51, 0x52, 0x43, 0x40, 0x45, 0x46, 0x4f, 0x4c, 0x49, 0x4a, 0x6b, 0x68, 0x6d, 0x6e, + 0x67, 0x64, 0x61, 0x62, 0x73, 0x70, 0x75, 0x76, 0x7f, 0x7c, 0x79, 0x7a, 0x3b, 0x38, 0x3d, 0x3e, 0x37, 0x34, + 0x31, 0x32, 0x23, 0x20, 0x25, 0x26, 0x2f, 0x2c, 0x29, 0x2a, 0x0b, 0x08, 0x0d, 0x0e, 0x07, 0x04, 0x01, 0x02, + 0x13, 0x10, 0x15, 0x16, 0x1f, 0x1c, 0x19, 0x1a }; + + /* + * Precalculated lookup table for galois field multiplication by 9 used in + * the MixColums step during decryption. + */ + private static int[] mult9 = { 0x00, 0x09, 0x12, 0x1b, 0x24, 0x2d, 0x36, 0x3f, 0x48, 0x41, 0x5a, 0x53, 0x6c, 0x65, + 0x7e, 0x77, 0x90, 0x99, 0x82, 0x8b, 0xb4, 0xbd, 0xa6, 0xaf, 0xd8, 0xd1, 0xca, 0xc3, 0xfc, 0xf5, 0xee, 0xe7, + 0x3b, 0x32, 0x29, 0x20, 0x1f, 0x16, 0x0d, 0x04, 0x73, 0x7a, 0x61, 0x68, 0x57, 0x5e, 0x45, 0x4c, 0xab, 0xa2, + 0xb9, 0xb0, 0x8f, 0x86, 0x9d, 0x94, 0xe3, 0xea, 0xf1, 0xf8, 0xc7, 0xce, 0xd5, 0xdc, 0x76, 0x7f, 0x64, 0x6d, + 0x52, 0x5b, 0x40, 0x49, 0x3e, 0x37, 0x2c, 0x25, 0x1a, 0x13, 0x08, 0x01, 0xe6, 0xef, 0xf4, 0xfd, 0xc2, 0xcb, + 0xd0, 0xd9, 0xae, 0xa7, 0xbc, 0xb5, 0x8a, 0x83, 0x98, 0x91, 0x4d, 0x44, 0x5f, 0x56, 0x69, 0x60, 0x7b, 0x72, + 0x05, 0x0c, 0x17, 0x1e, 0x21, 0x28, 0x33, 0x3a, 0xdd, 0xd4, 0xcf, 0xc6, 0xf9, 0xf0, 0xeb, 0xe2, 0x95, 0x9c, + 0x87, 0x8e, 0xb1, 0xb8, 0xa3, 0xaa, 0xec, 0xe5, 0xfe, 0xf7, 0xc8, 0xc1, 0xda, 0xd3, 0xa4, 0xad, 0xb6, 0xbf, + 0x80, 0x89, 0x92, 0x9b, 0x7c, 0x75, 0x6e, 0x67, 0x58, 0x51, 0x4a, 0x43, 0x34, 0x3d, 0x26, 0x2f, 0x10, 0x19, + 0x02, 0x0b, 0xd7, 0xde, 0xc5, 0xcc, 0xf3, 0xfa, 0xe1, 0xe8, 0x9f, 0x96, 0x8d, 0x84, 0xbb, 0xb2, 0xa9, 0xa0, + 0x47, 0x4e, 0x55, 0x5c, 0x63, 0x6a, 0x71, 0x78, 0x0f, 0x06, 0x1d, 0x14, 0x2b, 0x22, 0x39, 0x30, 0x9a, 0x93, + 0x88, 0x81, 0xbe, 0xb7, 0xac, 0xa5, 0xd2, 0xdb, 0xc0, 0xc9, 0xf6, 0xff, 0xe4, 0xed, 0x0a, 0x03, 0x18, 0x11, + 0x2e, 0x27, 0x3c, 0x35, 0x42, 0x4b, 0x50, 0x59, 0x66, 0x6f, 0x74, 0x7d, 0xa1, 0xa8, 0xb3, 0xba, 0x85, 0x8c, + 0x97, 0x9e, 0xe9, 0xe0, 0xfb, 0xf2, 0xcd, 0xc4, 0xdf, 0xd6, 0x31, 0x38, 0x23, 0x2a, 0x15, 0x1c, 0x07, 0x0e, + 0x79, 0x70, 0x6b, 0x62, 0x5d, 0x54, 0x4f, 0x46 }; + + /* + * Precalculated lookup table for galois field multiplication by 11 used in + * the MixColums step during decryption. + */ + private static int[] mult11 = { 0x00, 0x0b, 0x16, 0x1d, 0x2c, 0x27, 0x3a, 0x31, 0x58, 0x53, 0x4e, 0x45, 0x74, 0x7f, + 0x62, 0x69, 0xb0, 0xbb, 0xa6, 0xad, 0x9c, 0x97, 0x8a, 0x81, 0xe8, 0xe3, 0xfe, 0xf5, 0xc4, 0xcf, 0xd2, 0xd9, + 0x7b, 0x70, 0x6d, 0x66, 0x57, 0x5c, 0x41, 0x4a, 0x23, 0x28, 0x35, 0x3e, 0x0f, 0x04, 0x19, 0x12, 0xcb, 0xc0, + 0xdd, 0xd6, 0xe7, 0xec, 0xf1, 0xfa, 0x93, 0x98, 0x85, 0x8e, 0xbf, 0xb4, 0xa9, 0xa2, 0xf6, 0xfd, 0xe0, 0xeb, + 0xda, 0xd1, 0xcc, 0xc7, 0xae, 0xa5, 0xb8, 0xb3, 0x82, 0x89, 0x94, 0x9f, 0x46, 0x4d, 0x50, 0x5b, 0x6a, 0x61, + 0x7c, 0x77, 0x1e, 0x15, 0x08, 0x03, 0x32, 0x39, 0x24, 0x2f, 0x8d, 0x86, 0x9b, 0x90, 0xa1, 0xaa, 0xb7, 0xbc, + 0xd5, 0xde, 0xc3, 0xc8, 0xf9, 0xf2, 0xef, 0xe4, 0x3d, 0x36, 0x2b, 0x20, 0x11, 0x1a, 0x07, 0x0c, 0x65, 0x6e, + 0x73, 0x78, 0x49, 0x42, 0x5f, 0x54, 0xf7, 0xfc, 0xe1, 0xea, 0xdb, 0xd0, 0xcd, 0xc6, 0xaf, 0xa4, 0xb9, 0xb2, + 0x83, 0x88, 0x95, 0x9e, 0x47, 0x4c, 0x51, 0x5a, 0x6b, 0x60, 0x7d, 0x76, 0x1f, 0x14, 0x09, 0x02, 0x33, 0x38, + 0x25, 0x2e, 0x8c, 0x87, 0x9a, 0x91, 0xa0, 0xab, 0xb6, 0xbd, 0xd4, 0xdf, 0xc2, 0xc9, 0xf8, 0xf3, 0xee, 0xe5, + 0x3c, 0x37, 0x2a, 0x21, 0x10, 0x1b, 0x06, 0x0d, 0x64, 0x6f, 0x72, 0x79, 0x48, 0x43, 0x5e, 0x55, 0x01, 0x0a, + 0x17, 0x1c, 0x2d, 0x26, 0x3b, 0x30, 0x59, 0x52, 0x4f, 0x44, 0x75, 0x7e, 0x63, 0x68, 0xb1, 0xba, 0xa7, 0xac, + 0x9d, 0x96, 0x8b, 0x80, 0xe9, 0xe2, 0xff, 0xf4, 0xc5, 0xce, 0xd3, 0xd8, 0x7a, 0x71, 0x6c, 0x67, 0x56, 0x5d, + 0x40, 0x4b, 0x22, 0x29, 0x34, 0x3f, 0x0e, 0x05, 0x18, 0x13, 0xca, 0xc1, 0xdc, 0xd7, 0xe6, 0xed, 0xf0, 0xfb, + 0x92, 0x99, 0x84, 0x8f, 0xbe, 0xb5, 0xa8, 0xa3 }; + + /* + * Precalculated lookup table for galois field multiplication by 13 used in + * the MixColums step during decryption. + */ + private static int[] mult13 = { 0x00, 0x0d, 0x1a, 0x17, 0x34, 0x39, 0x2e, 0x23, 0x68, 0x65, 0x72, 0x7f, 0x5c, 0x51, + 0x46, 0x4b, 0xd0, 0xdd, 0xca, 0xc7, 0xe4, 0xe9, 0xfe, 0xf3, 0xb8, 0xb5, 0xa2, 0xaf, 0x8c, 0x81, 0x96, 0x9b, + 0xbb, 0xb6, 0xa1, 0xac, 0x8f, 0x82, 0x95, 0x98, 0xd3, 0xde, 0xc9, 0xc4, 0xe7, 0xea, 0xfd, 0xf0, 0x6b, 0x66, + 0x71, 0x7c, 0x5f, 0x52, 0x45, 0x48, 0x03, 0x0e, 0x19, 0x14, 0x37, 0x3a, 0x2d, 0x20, 0x6d, 0x60, 0x77, 0x7a, + 0x59, 0x54, 0x43, 0x4e, 0x05, 0x08, 0x1f, 0x12, 0x31, 0x3c, 0x2b, 0x26, 0xbd, 0xb0, 0xa7, 0xaa, 0x89, 0x84, + 0x93, 0x9e, 0xd5, 0xd8, 0xcf, 0xc2, 0xe1, 0xec, 0xfb, 0xf6, 0xd6, 0xdb, 0xcc, 0xc1, 0xe2, 0xef, 0xf8, 0xf5, + 0xbe, 0xb3, 0xa4, 0xa9, 0x8a, 0x87, 0x90, 0x9d, 0x06, 0x0b, 0x1c, 0x11, 0x32, 0x3f, 0x28, 0x25, 0x6e, 0x63, + 0x74, 0x79, 0x5a, 0x57, 0x40, 0x4d, 0xda, 0xd7, 0xc0, 0xcd, 0xee, 0xe3, 0xf4, 0xf9, 0xb2, 0xbf, 0xa8, 0xa5, + 0x86, 0x8b, 0x9c, 0x91, 0x0a, 0x07, 0x10, 0x1d, 0x3e, 0x33, 0x24, 0x29, 0x62, 0x6f, 0x78, 0x75, 0x56, 0x5b, + 0x4c, 0x41, 0x61, 0x6c, 0x7b, 0x76, 0x55, 0x58, 0x4f, 0x42, 0x09, 0x04, 0x13, 0x1e, 0x3d, 0x30, 0x27, 0x2a, + 0xb1, 0xbc, 0xab, 0xa6, 0x85, 0x88, 0x9f, 0x92, 0xd9, 0xd4, 0xc3, 0xce, 0xed, 0xe0, 0xf7, 0xfa, 0xb7, 0xba, + 0xad, 0xa0, 0x83, 0x8e, 0x99, 0x94, 0xdf, 0xd2, 0xc5, 0xc8, 0xeb, 0xe6, 0xf1, 0xfc, 0x67, 0x6a, 0x7d, 0x70, + 0x53, 0x5e, 0x49, 0x44, 0x0f, 0x02, 0x15, 0x18, 0x3b, 0x36, 0x21, 0x2c, 0x0c, 0x01, 0x16, 0x1b, 0x38, 0x35, + 0x22, 0x2f, 0x64, 0x69, 0x7e, 0x73, 0x50, 0x5d, 0x4a, 0x47, 0xdc, 0xd1, 0xc6, 0xcb, 0xe8, 0xe5, 0xf2, 0xff, + 0xb4, 0xb9, 0xae, 0xa3, 0x80, 0x8d, 0x9a, 0x97 }; + + /* + * Precalculated lookup table for galois field multiplication by 14 used in + * the MixColums step during decryption. + */ + private static int[] mult14 = { 0x00, 0x0e, 0x1c, 0x12, 0x38, 0x36, 0x24, 0x2a, 0x70, 0x7e, 0x6c, 0x62, 0x48, 0x46, + 0x54, 0x5a, 0xe0, 0xee, 0xfc, 0xf2, 0xd8, 0xd6, 0xc4, 0xca, 0x90, 0x9e, 0x8c, 0x82, 0xa8, 0xa6, 0xb4, 0xba, + 0xdb, 0xd5, 0xc7, 0xc9, 0xe3, 0xed, 0xff, 0xf1, 0xab, 0xa5, 0xb7, 0xb9, 0x93, 0x9d, 0x8f, 0x81, 0x3b, 0x35, + 0x27, 0x29, 0x03, 0x0d, 0x1f, 0x11, 0x4b, 0x45, 0x57, 0x59, 0x73, 0x7d, 0x6f, 0x61, 0xad, 0xa3, 0xb1, 0xbf, + 0x95, 0x9b, 0x89, 0x87, 0xdd, 0xd3, 0xc1, 0xcf, 0xe5, 0xeb, 0xf9, 0xf7, 0x4d, 0x43, 0x51, 0x5f, 0x75, 0x7b, + 0x69, 0x67, 0x3d, 0x33, 0x21, 0x2f, 0x05, 0x0b, 0x19, 0x17, 0x76, 0x78, 0x6a, 0x64, 0x4e, 0x40, 0x52, 0x5c, + 0x06, 0x08, 0x1a, 0x14, 0x3e, 0x30, 0x22, 0x2c, 0x96, 0x98, 0x8a, 0x84, 0xae, 0xa0, 0xb2, 0xbc, 0xe6, 0xe8, + 0xfa, 0xf4, 0xde, 0xd0, 0xc2, 0xcc, 0x41, 0x4f, 0x5d, 0x53, 0x79, 0x77, 0x65, 0x6b, 0x31, 0x3f, 0x2d, 0x23, + 0x09, 0x07, 0x15, 0x1b, 0xa1, 0xaf, 0xbd, 0xb3, 0x99, 0x97, 0x85, 0x8b, 0xd1, 0xdf, 0xcd, 0xc3, 0xe9, 0xe7, + 0xf5, 0xfb, 0x9a, 0x94, 0x86, 0x88, 0xa2, 0xac, 0xbe, 0xb0, 0xea, 0xe4, 0xf6, 0xf8, 0xd2, 0xdc, 0xce, 0xc0, + 0x7a, 0x74, 0x66, 0x68, 0x42, 0x4c, 0x5e, 0x50, 0x0a, 0x04, 0x16, 0x18, 0x32, 0x3c, 0x2e, 0x20, 0xec, 0xe2, + 0xf0, 0xfe, 0xd4, 0xda, 0xc8, 0xc6, 0x9c, 0x92, 0x80, 0x8e, 0xa4, 0xaa, 0xb8, 0xb6, 0x0c, 0x02, 0x10, 0x1e, + 0x34, 0x3a, 0x28, 0x26, 0x7c, 0x72, 0x60, 0x6e, 0x44, 0x4a, 0x58, 0x56, 0x37, 0x39, 0x2b, 0x25, 0x0f, 0x01, + 0x13, 0x1d, 0x47, 0x49, 0x5b, 0x55, 0x7f, 0x71, 0x63, 0x6d, 0xd7, 0xd9, 0xcb, 0xc5, 0xef, 0xe1, 0xf3, 0xfd, + 0xa7, 0xa9, 0xbb, 0xb5, 0x9f, 0x91, 0x83, 0x8d }; + + /* + * Subroutine of the Rijndael key expansion. + */ + public static BigInteger scheduleCore(BigInteger t, int rconCounter) { + String rBytes = t.toString(16); + + // Add zero padding + while (rBytes.length() < 8) { + rBytes = "0" + rBytes; + } + + // rotate the first 16 bits to the back + String rotatingBytes = rBytes.substring(0, 2); + String fixedBytes = rBytes.substring(2); + + rBytes = fixedBytes + rotatingBytes; + + // apply S-Box to all 8-Bit Substrings + for (int i = 0; i < 4; i++) { + String currentByteBits = rBytes.substring(i * 2, (i + 1) * 2); + + int currentByte = Integer.parseInt(currentByteBits, 16); + currentByte = sBox[currentByte]; + + // add the current rcon value to the first byte + if (i == 0) { + currentByte = currentByte ^ rcon[rconCounter]; + } + + currentByteBits = Integer.toHexString(currentByte); + + // Add zero padding + while (currentByteBits.length() < 2) { + currentByteBits = "0" + currentByteBits; + } + + // replace bytes in original string + rBytes = rBytes.substring(0, i * 2) + currentByteBits + rBytes.substring((i + 1) * 2); + } + + t = new BigInteger(rBytes, 16); + + return t; + } + + /* + * Returns an array of 10 + 1 round keys that are calcualted by using + * Rijndael key schedule + */ + public static BigInteger[] keyExpansion(BigInteger initialKey) { + BigInteger[] roundKeys = { initialKey, new BigInteger("0"), new BigInteger("0"), new BigInteger("0"), + new BigInteger("0"), new BigInteger("0"), new BigInteger("0"), new BigInteger("0"), new BigInteger("0"), + new BigInteger("0"), new BigInteger("0"), }; + + for (int i = 1; i < 11; i++) { + + // get the previous 32 bits the key + BigInteger t = roundKeys[i - 1].remainder(new BigInteger("100000000", 16)); + + // initialize rcon iteration + int rconCounter = 1; + + // schedule core + t = scheduleCore(t, rconCounter); + rconCounter += 1; + BigInteger t1 = t.multiply(new BigInteger("100000000", 16)); + BigInteger t2 = t.multiply(new BigInteger("10000000000000000", 16)); + BigInteger t3 = t.multiply(new BigInteger("1000000000000000000000000", 16)); + t = t.add(t1).add(t2).add(t3); + + BigInteger xorMask = roundKeys[i - 1].divide(new BigInteger("100000000", 16)); + xorMask = xorMask.multiply(new BigInteger("100000000", 16)); + t = t.xor(xorMask); + roundKeys[i] = t; + + } + return roundKeys; + } + + /* + * Returns a representation of the input 128-bit block as an array of 8-bit + * integers. + */ + public static int[] splitBlockIntoCells(BigInteger block) { + + int[] cells = new int[16]; + String blockBits = block.toString(2); + + // Append leading 0 for full "128-bit" string + while (blockBits.length() < 128) { + blockBits = "0" + blockBits; + } + + for (int i = 0; i < 16; i++) { + String cellBits = blockBits.substring(8 * i, 8 * (i + 1)); + cells[i] = Integer.parseInt(cellBits, 2); + } + + return cells; + } + + /* + * Returns the 128-bit BigInteger representation of the input of an array of + * 8-bit integers. + */ + public static BigInteger mergeCellsIntoBlock(int[] cells) { + + String blockBits = ""; + for (int i = 0; i < 16; i++) { + String cellBits = Integer.toBinaryString(cells[i]); + + // Append leading 0 for full "8-bit" strings + while (cellBits.length() < 8) { + cellBits = "0" + cellBits; + } + + blockBits += cellBits; + } + + return new BigInteger(blockBits, 2); + } + + /* + * Returns ciphertext XOR key + */ + public static BigInteger addRoundKey(BigInteger ciphertext, BigInteger key) { + return ciphertext.xor(key); + } + + /* + * substitutes 8-Bit long substrings of the input using the S-Box and + * returns the result. + */ + public static BigInteger subBytes(BigInteger ciphertext) { + + int[] cells = splitBlockIntoCells(ciphertext); + + for (int i = 0; i < 16; i++) { + cells[i] = sBox[cells[i]]; + } + + return mergeCellsIntoBlock(cells); + } + + /* + * substitutes 8-Bit long substrings of the input using the inverse S-Box + * for decryption and returns the result. + */ + public static BigInteger subBytesDec(BigInteger ciphertext) { + + int[] cells = splitBlockIntoCells(ciphertext); + + for (int i = 0; i < 16; i++) { + cells[i] = inverseSBox[cells[i]]; + } + + return mergeCellsIntoBlock(cells); + } + + /* + * Cell permutation step. Shifts cells within the rows of the input and + * returns the result. + */ + public static BigInteger shiftRows(BigInteger ciphertext) { + int[] cells = splitBlockIntoCells(ciphertext); + int[] output = new int[16]; + + // do nothing in the first row + output[0] = cells[0]; + output[4] = cells[4]; + output[8] = cells[8]; + output[12] = cells[12]; + + // shift the second row backwards by one cell + output[1] = cells[5]; + output[5] = cells[9]; + output[9] = cells[13]; + output[13] = cells[1]; + + // shift the third row backwards by two cell + output[2] = cells[10]; + output[6] = cells[14]; + output[10] = cells[2]; + output[14] = cells[6]; + + // shift the forth row backwards by tree cell + output[3] = cells[15]; + output[7] = cells[3]; + output[11] = cells[7]; + output[15] = cells[11]; + + return mergeCellsIntoBlock(output); + } + + /* + * Cell permutation step for decryption . Shifts cells within the rows of + * the input and returns the result. + */ + public static BigInteger shiftRowsDec(BigInteger ciphertext) { + int[] cells = splitBlockIntoCells(ciphertext); + int[] output = new int[16]; + + // do nothing in the first row + output[0] = cells[0]; + output[4] = cells[4]; + output[8] = cells[8]; + output[12] = cells[12]; + + // shift the second row forwards by one cell + output[1] = cells[13]; + output[5] = cells[1]; + output[9] = cells[5]; + output[13] = cells[9]; + + // shift the third row forwards by two cell + output[2] = cells[10]; + output[6] = cells[14]; + output[10] = cells[2]; + output[14] = cells[6]; + + // shift the forth row forwards by tree cell + output[3] = cells[7]; + output[7] = cells[11]; + output[11] = cells[15]; + output[15] = cells[3]; + + return mergeCellsIntoBlock(output); + } + + /* + * Applies the Rijndael MixColumns to the input and returns the result. + */ + public static BigInteger mixColumns(BigInteger ciphertext) { + + int[] cells = splitBlockIntoCells(ciphertext); + int[] outputCells = new int[16]; + + for (int i = 0; i < 4; i++) { + int[] row = { cells[i*4], cells[i*4 + 1], cells[i*4 + 2], cells[i*4 + 3] }; + + outputCells[i*4] = mult2[row[0]] ^ mult3[row[1]] ^ row[2] ^ row[3]; + outputCells[i*4 + 1] = row[0] ^ mult2[row[1]] ^ mult3[row[2]] ^ row[3]; + outputCells[i*4 + 2] = row[0] ^ row[1] ^ mult2[row[2]] ^ mult3[row[3]]; + outputCells[i*4 + 3] = mult3[row[0]] ^ row[1] ^ row[2] ^ mult2[row[3]]; + } + return mergeCellsIntoBlock(outputCells); + } + + /* + * Applies the inverse Rijndael MixColumns for decryption to the input and + * returns the result. + */ + public static BigInteger mixColumnsDec(BigInteger ciphertext) { + + int[] cells = splitBlockIntoCells(ciphertext); + int[] outputCells = new int[16]; + + for (int i = 0; i < 4; i++) { + int[] row = { cells[i*4], cells[i*4 + 1], cells[i*4 + 2], cells[i*4 + 3] }; + + outputCells[i*4] = mult14[row[0]] ^ mult11[row[1]] ^ mult13[row[2]] ^ mult9[row[3]]; + outputCells[i*4 + 1] = mult9[row[0]] ^ mult14[row[1]] ^ mult11[row[2]] ^ mult13[row[3]]; + outputCells[i*4 + 2] = mult13[row[0]] ^ mult9[row[1]] ^ mult14[row[2]] ^ mult11[row[3]]; + outputCells[i*4 + 3] = mult11[row[0]] ^ mult13[row[1]] ^ mult9[row[2]] ^ mult14[row[3]]; + } + return mergeCellsIntoBlock(outputCells); + } + + /* + * Encrypts the plaintext with the key and returns the result + */ + public static BigInteger encrypt(BigInteger plaintext, BigInteger key) { + + BigInteger[] roundKeys = keyExpansion(key); + + // Initial round + plaintext = addRoundKey(plaintext, roundKeys[0]); + + // Main rounds + for (int i = 1; i < 10; i++) { + plaintext = subBytes(plaintext); + plaintext = shiftRows(plaintext); + plaintext = mixColumns(plaintext); + plaintext = addRoundKey(plaintext, roundKeys[i]); + } + + // Final round + plaintext = subBytes(plaintext); + plaintext = shiftRows(plaintext); + plaintext = addRoundKey(plaintext, roundKeys[10]); + + return plaintext; + } + + /* + * Decrypts the ciphertext with the key and returns the result + */ + public static BigInteger decrypt(BigInteger ciphertext, BigInteger key) { + + BigInteger[] roundKeys = keyExpansion(key); + + // Invert final round + ciphertext = addRoundKey(ciphertext, roundKeys[10]); + ciphertext = shiftRowsDec(ciphertext); + ciphertext = subBytesDec(ciphertext); + + // Invert main rounds + for (int i = 9; i > 0; i--) { + ciphertext = addRoundKey(ciphertext, roundKeys[i]); + ciphertext = mixColumnsDec(ciphertext); + ciphertext = shiftRowsDec(ciphertext); + ciphertext = subBytesDec(ciphertext); + } + + // Invert initial round + ciphertext = addRoundKey(ciphertext, roundKeys[0]); + + return ciphertext; + } + + public static void main(String[] args) { + + boolean encrypt = false; + BigInteger key = new BigInteger("f0f1f2f3f4f5f6f708090a0b0c0d0e0f", 16); + BigInteger plaintext = new BigInteger("0", 16); + BigInteger ciphertext = new BigInteger("adcfc0ed15292419cb796167bc02b669", 16); + BigInteger output; + + if (encrypt) { + output = encrypt(plaintext, key); + } else { + output = decrypt(ciphertext, key); + } + + System.out.println(output.toString(16)); + + } + +} diff --git a/ciphers/AESTest.java b/ciphers/AESTest.java new file mode 100644 index 000000000000..b986514a8ec4 --- /dev/null +++ b/ciphers/AESTest.java @@ -0,0 +1,87 @@ +package ciphers; + +import static org.junit.Assert.*; + +import java.math.BigInteger; + +import org.junit.Test; + +public class AESTest { + + @Test + public void testSubBytes() { + BigInteger x = new BigInteger("00ff01ff02ff03ff04ff05ff06ff07ff",16); + BigInteger expected = new BigInteger("63167c1677167b16f2166b166f16c516",16); + + assertEquals(expected,AES.subBytes(x)); + } + + @Test + public void testSubBytesDec() { + BigInteger x = new BigInteger("63167c1677167b16f2166b166f16c516",16); + BigInteger expected = new BigInteger("00ff01ff02ff03ff04ff05ff06ff07ff",16); + + assertEquals(expected,AES.subBytesDec(x)); + } + + @Test + public void testShiftRows() { + BigInteger x = new BigInteger("00102030011121310212223203132333",16); + BigInteger expected = new BigInteger("00112233011223300213203103102132",16); + + assertEquals(expected,AES.shiftRows(x)); + } + + @Test + public void testShiftRowsDec() { + BigInteger x = new BigInteger("00112233011223300213203103102132",16); + BigInteger expected = new BigInteger("00102030011121310212223203132333",16); + + assertEquals(expected,AES.shiftRowsDec(x)); + } + + @Test + public void testMixColumns() { + BigInteger x = new BigInteger("db135345f20a225c010101012d26314c",16); + BigInteger expected = new BigInteger("8e4da1bc9fdc589d010101014d7ebdf8",16); + + assertEquals(expected,AES.mixColumns(x)); + } + + @Test + public void testMixColumnsDec() { + BigInteger x = new BigInteger("8e4da1bc9fdc589d010101014d7ebdf8",16); + BigInteger expected = new BigInteger("db135345f20a225c010101012d26314c",16); + + assertEquals(expected,AES.mixColumnsDec(x)); + } + + @Test + public void testEncryptAndDecryptCorrectKey() { + // Plaintext/Ciphertext pairing with correct key + BigInteger key = new BigInteger("f0f1f2f3f4f5f6f708090a0b0c0d0e0f", 16); + BigInteger plaintext = new BigInteger("e9870a476d8d0bc43abde33cba26747e", 16); + BigInteger ciphertext = new BigInteger("adcfc0ed15292419cb796167bc02b669", 16); + + BigInteger encryptedPlaintext = AES.encrypt(plaintext,key); + BigInteger decryptedCiphertext = AES.decrypt(ciphertext,key); + + assertEquals(plaintext,decryptedCiphertext); + assertEquals(ciphertext,encryptedPlaintext); + } + + @Test + public void testEncryptAndDecryptWrongKey() { + // Plaintext/Ciphertext Pairing with incorrect key + BigInteger key = new BigInteger("f4f1f2f3f4f5f6f708090a0b0c0d0e0f", 16); + BigInteger plaintext = new BigInteger("e9870a476d8d0bc43abde33cba26747e", 16); + BigInteger ciphertext = new BigInteger("adcfc0ed15292419cb796167bc02b669", 16); + + BigInteger encryptedPlaintext = AES.encrypt(plaintext,key); + BigInteger decryptedCiphertext = AES.decrypt(plaintext,key); + + assertNotEquals(plaintext,decryptedCiphertext); + assertNotEquals(ciphertext,encryptedPlaintext); + } + +} From 96d78e641ebeeb69a02bce6b615682a4b68bc10f Mon Sep 17 00:00:00 2001 From: Phil-Schmidt Date: Mon, 27 Nov 2017 02:43:19 +0100 Subject: [PATCH 3/4] Fixed Key Expansion + Removed Tests Key Expansion should now be able to return the correct keys. Removed JUnit tests for the final release --- ciphers/AES.java | 42 ++++++++++++++------- ciphers/AESTest.java | 87 -------------------------------------------- 2 files changed, 28 insertions(+), 101 deletions(-) delete mode 100644 ciphers/AESTest.java diff --git a/ciphers/AES.java b/ciphers/AES.java index 2323e09fcae8..33e5441315d9 100644 --- a/ciphers/AES.java +++ b/ciphers/AES.java @@ -242,26 +242,38 @@ public static BigInteger[] keyExpansion(BigInteger initialKey) { new BigInteger("0"), new BigInteger("0"), new BigInteger("0"), new BigInteger("0"), new BigInteger("0"), new BigInteger("0"), new BigInteger("0"), }; + // initialize rcon iteration + int rconCounter = 1; + for (int i = 1; i < 11; i++) { // get the previous 32 bits the key BigInteger t = roundKeys[i - 1].remainder(new BigInteger("100000000", 16)); - - // initialize rcon iteration - int rconCounter = 1; - - // schedule core + + // split previous key into 8-bit segments + BigInteger[] prevKey = { + roundKeys[i - 1].remainder(new BigInteger("100000000", 16)), + roundKeys[i - 1].remainder(new BigInteger("10000000000000000", 16)).divide(new BigInteger("100000000", 16)), + roundKeys[i - 1].remainder(new BigInteger("1000000000000000000000000", 16)).divide(new BigInteger("10000000000000000", 16)), + roundKeys[i - 1].divide(new BigInteger("1000000000000000000000000", 16)), + }; + + // run schedule core t = scheduleCore(t, rconCounter); rconCounter += 1; - BigInteger t1 = t.multiply(new BigInteger("100000000", 16)); - BigInteger t2 = t.multiply(new BigInteger("10000000000000000", 16)); - BigInteger t3 = t.multiply(new BigInteger("1000000000000000000000000", 16)); - t = t.add(t1).add(t2).add(t3); + + // Calculate partial round key + BigInteger t0 = t.xor(prevKey[3]); + BigInteger t1 = t0.xor(prevKey[2]); + BigInteger t2 = t1.xor(prevKey[1]); + BigInteger t3 = t2.xor(prevKey[0]); + + // Join round key segments + t2 = t2.multiply(new BigInteger("100000000", 16)); + t1 = t1.multiply(new BigInteger("10000000000000000", 16)); + t0 = t0.multiply(new BigInteger("1000000000000000000000000", 16)); + roundKeys[i] = t0.add(t1).add(t2).add(t3); - BigInteger xorMask = roundKeys[i - 1].divide(new BigInteger("100000000", 16)); - xorMask = xorMask.multiply(new BigInteger("100000000", 16)); - t = t.xor(xorMask); - roundKeys[i] = t; } return roundKeys; @@ -511,11 +523,13 @@ public static BigInteger decrypt(BigInteger ciphertext, BigInteger key) { public static void main(String[] args) { boolean encrypt = false; - BigInteger key = new BigInteger("f0f1f2f3f4f5f6f708090a0b0c0d0e0f", 16); + BigInteger key = new BigInteger("0", 16); BigInteger plaintext = new BigInteger("0", 16); BigInteger ciphertext = new BigInteger("adcfc0ed15292419cb796167bc02b669", 16); BigInteger output; + System.out.println(keyExpansion(key)[2].xor(new BigInteger("9b9898c9f9fbfbaa9b9898c9f9fbfbaa",16)).toString(16)); + if (encrypt) { output = encrypt(plaintext, key); } else { diff --git a/ciphers/AESTest.java b/ciphers/AESTest.java deleted file mode 100644 index b986514a8ec4..000000000000 --- a/ciphers/AESTest.java +++ /dev/null @@ -1,87 +0,0 @@ -package ciphers; - -import static org.junit.Assert.*; - -import java.math.BigInteger; - -import org.junit.Test; - -public class AESTest { - - @Test - public void testSubBytes() { - BigInteger x = new BigInteger("00ff01ff02ff03ff04ff05ff06ff07ff",16); - BigInteger expected = new BigInteger("63167c1677167b16f2166b166f16c516",16); - - assertEquals(expected,AES.subBytes(x)); - } - - @Test - public void testSubBytesDec() { - BigInteger x = new BigInteger("63167c1677167b16f2166b166f16c516",16); - BigInteger expected = new BigInteger("00ff01ff02ff03ff04ff05ff06ff07ff",16); - - assertEquals(expected,AES.subBytesDec(x)); - } - - @Test - public void testShiftRows() { - BigInteger x = new BigInteger("00102030011121310212223203132333",16); - BigInteger expected = new BigInteger("00112233011223300213203103102132",16); - - assertEquals(expected,AES.shiftRows(x)); - } - - @Test - public void testShiftRowsDec() { - BigInteger x = new BigInteger("00112233011223300213203103102132",16); - BigInteger expected = new BigInteger("00102030011121310212223203132333",16); - - assertEquals(expected,AES.shiftRowsDec(x)); - } - - @Test - public void testMixColumns() { - BigInteger x = new BigInteger("db135345f20a225c010101012d26314c",16); - BigInteger expected = new BigInteger("8e4da1bc9fdc589d010101014d7ebdf8",16); - - assertEquals(expected,AES.mixColumns(x)); - } - - @Test - public void testMixColumnsDec() { - BigInteger x = new BigInteger("8e4da1bc9fdc589d010101014d7ebdf8",16); - BigInteger expected = new BigInteger("db135345f20a225c010101012d26314c",16); - - assertEquals(expected,AES.mixColumnsDec(x)); - } - - @Test - public void testEncryptAndDecryptCorrectKey() { - // Plaintext/Ciphertext pairing with correct key - BigInteger key = new BigInteger("f0f1f2f3f4f5f6f708090a0b0c0d0e0f", 16); - BigInteger plaintext = new BigInteger("e9870a476d8d0bc43abde33cba26747e", 16); - BigInteger ciphertext = new BigInteger("adcfc0ed15292419cb796167bc02b669", 16); - - BigInteger encryptedPlaintext = AES.encrypt(plaintext,key); - BigInteger decryptedCiphertext = AES.decrypt(ciphertext,key); - - assertEquals(plaintext,decryptedCiphertext); - assertEquals(ciphertext,encryptedPlaintext); - } - - @Test - public void testEncryptAndDecryptWrongKey() { - // Plaintext/Ciphertext Pairing with incorrect key - BigInteger key = new BigInteger("f4f1f2f3f4f5f6f708090a0b0c0d0e0f", 16); - BigInteger plaintext = new BigInteger("e9870a476d8d0bc43abde33cba26747e", 16); - BigInteger ciphertext = new BigInteger("adcfc0ed15292419cb796167bc02b669", 16); - - BigInteger encryptedPlaintext = AES.encrypt(plaintext,key); - BigInteger decryptedCiphertext = AES.decrypt(plaintext,key); - - assertNotEquals(plaintext,decryptedCiphertext); - assertNotEquals(ciphertext,encryptedPlaintext); - } - -} From 7108ef904550f7de8acba42658f873d9a31c1e56 Mon Sep 17 00:00:00 2001 From: Phil-Schmidt Date: Mon, 27 Nov 2017 03:03:58 +0100 Subject: [PATCH 4/4] Added I/O Added basic command line I/O functionality --- ciphers/AES.java | 39 +++++++++++++++++++++++++-------------- 1 file changed, 25 insertions(+), 14 deletions(-) diff --git a/ciphers/AES.java b/ciphers/AES.java index 33e5441315d9..0e4bfff98a35 100644 --- a/ciphers/AES.java +++ b/ciphers/AES.java @@ -1,6 +1,7 @@ package ciphers; import java.math.BigInteger; +import java.util.Scanner; /* This class is build to demonstrate the * apllication of the AES-algorithm on @@ -521,23 +522,33 @@ public static BigInteger decrypt(BigInteger ciphertext, BigInteger key) { } public static void main(String[] args) { - - boolean encrypt = false; - BigInteger key = new BigInteger("0", 16); - BigInteger plaintext = new BigInteger("0", 16); - BigInteger ciphertext = new BigInteger("adcfc0ed15292419cb796167bc02b669", 16); - BigInteger output; - - System.out.println(keyExpansion(key)[2].xor(new BigInteger("9b9898c9f9fbfbaa9b9898c9f9fbfbaa",16)).toString(16)); - if (encrypt) { - output = encrypt(plaintext, key); - } else { - output = decrypt(ciphertext, key); + Scanner input = new Scanner(System.in); + + System.out.println("Do you want to (e)ncrypt or (d)ecrypt a message?"); + char choice = input.nextLine().charAt(0); + String in; + if(choice == 'E' || choice=='e'){ + System.out.println("Choose a plaintext block (128-Bit Integer in base 16):\n"); + in = input.nextLine(); + BigInteger plaintext = new BigInteger(in, 16); + System.out.println("Choose a Key (128-Bit Integer in base 16):\n"); + in = input.nextLine(); + BigInteger key = new BigInteger(in, 16); + + System.out.println("The encrypted message is: \n" + encrypt(plaintext,key).toString(16)); + } + if(choice =='D' || choice =='d'){ + System.out.println("Enter your ciphertext block (128-Bit Integer in base 16):\n"); + in = input.nextLine(); + BigInteger ciphertext = new BigInteger(in, 16); + System.out.println("Choose a Key (128-Bit Integer in base 16):\n"); + in = input.nextLine(); + BigInteger key = new BigInteger(in, 16); + System.out.println("The deciphered message is:\n" + decrypt(ciphertext,key).toString(16)); } - System.out.println(output.toString(16)); - + input.close(); } }