EVP_VerifyFinal
int EVP_VerifyFinal(EVP_MD_CTX *ctx, const unsigned char *sigbuf,
LCRYPTO_ALIAS(EVP_VerifyFinal);
LCRYPTO_USED(EVP_VerifyFinal);
i = EVP_VerifyFinal(&mdc_tmp, os->data, os->length, pkey);
res = EVP_VerifyFinal(ctx, sigblock, sigblock_len, evp_key);
res = EVP_VerifyFinal(ctx, sigblock, sigblock_len, evp_key);