#include <stdio.h>

#include <openssl/evp.h>

int main(int argc, char *argv[])

{

EVP_MD_CTX *mdctx;

const EVP_MD *md;

char mess1[] = "eyJhbGciOiJFUzI1NiIsInR5cCI6IkpXVCJ9.eyJpZCI6MSwiaXNzIjoiYXJ1bi5jb20iLCJ0aW1lX3N0ciI6Ijg6MThwbSAyNCBOb3YgMjAxNyIsIndoZXJlIjoiYWlycG9ydCJ9";

unsigned char md_value[EVP_MAX_MD_SIZE];

int md_len, i;

//OpenSSL_add_all_digests();

if(!argv[1]) {

printf("Usage: mdtest digestname\n");

exit(1);

}

md = EVP_sha256();

if(!md) {

printf("Unknown message digest %s\n", argv[1]);

exit(1);

}

mdctx = EVP_MD_CTX_create();

EVP_DigestInit_ex(mdctx, md, NULL);

EVP_DigestUpdate(mdctx, mess1, strlen(mess1));

EVP_DigestFinal_ex(mdctx, md_value, &md_len);

EVP_MD_CTX_destroy(mdctx);

printf("Dig: %s\n", md_value);

printf("Dig: %d\n", md_len);

printf("Digest is: ");

for(i = 0; i < md_len; i++)

printf("%02x", md_value[i]);

printf("\n");

d2i_ECDSA_SIG(NULL, (const unsigned char **)&md_value[0], md_len);

/* Call this once before exit. */

EVP_cleanup();

exit(0);

}