Hi,
I need to verify a message digest and its signature with a X.509
certificate. As far as I known, the procedure may looks like this:
pubkey = X509_get_pubkey(x);
rsa = EVP_PKEY_get1_RSA(pkey);
RSA_public_decrypt(signature_len, signature, rsa_out, rsa, pad);
memcmp(rsa_out, message_digest, message_digest_len);
but this procedure is too algorithm centric, it only applies while the
x.509 certificate contains a RSA public key. Is there any algorithm
independent functions which can be applied to not only RSA but also any
asymmetric encryption algorithm supported by openssl, ie. ECC or DSA?
Thanks very much!
Best regards,
Zhuang Yuyao
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