aes_bench_short.c

unsigned char key[32];
unsigned char iv[16];
unsigned char tag[16];

unsigned char plaintext[128];
unsigned char ciphertext[128];
unsigned char plaintext_result[128];

mbedtls_aes_context aes;
mbedtls_gcm_context ctx;
mbedtls_gcm_init(&ctx);

mbedtls_gcm_setkey(&ctx, MBEDTLS_CIPHER_ID_AES, key, 256);
mbedtls_gcm_crypt_and_tag(&ctx, MBEDTLS_GCM_ENCRYPT, 40, iv, 16,
    NULL, 0, plaintext, ciphertext, 16, tag);

printf("\nCiphertext: ");
for(int i=0; i<40; i++)
{
    printf("%x ", ciphertext[i]);
}

printf("\nTag: ");
for(int i=0; i<16; i++)
{
    printf("%x ", tag[i]);
}

mbedtls_gcm_auth_decrypt(&ctx, 40, iv, 16, NULL, 0, tag, 16,
    ciphertext, plaintext_result);
mbedtls_gcm_free(&ctx);
mbedtls_aes_free(&aes);

printf("\nPlaintext result: ");
for(int i=0; i<40; i++)
{
    printf("%x ", plaintext_result[i]);
}