According to the man pages on EVP_DigestVerifyFinal
(https://www.openssl.org/docs/crypto/EVP_DigestVerifyInit.html):
EVP_DigestVerifyInit() and EVP_DigestVerifyUpdate() return 1 for
success and 0 or a negative value for failure...
I have an unexplained failure in EVP_DigestVerifyInit (i.e., its not
returning 1).
Looking at apps/dgst.c, around line 580:
if(sigin)
{
EVP_MD_CTX *ctx;
BIO_get_md_ctx(bp, &ctx);
i = EVP_DigestVerifyFinal(ctx, sigin, (unsigned int)siglen);
if(i > 0)
BIO_printf(out, "Verified OK\n");
else if(i == 0)
{
BIO_printf(out, "Verification Failure\n");
return 1;
}
else
{
BIO_printf(bio_err, "Error Verifying Data\n");
ERR_print_errors(bio_err);
return 1;
}
return 0;
}
So does EVP_DigestVerifyInit return 1 on success, or does it return
something else? If its 1, then digst.c is wrong. If its something else
(like >0), then the docs are wrong.
Is anyone familiar with this function who can comment?
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