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Clarify return values for EVP_DigestVerifyFinal. #446

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Clarify return values for EVP_DigestVerifyFinal. #446

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9 changes: 5 additions & 4 deletions doc/crypto/EVP_DigestVerifyInit.pod
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Expand Up @@ -36,10 +36,11 @@ B<sig> of length B<siglen>.
EVP_DigestVerifyInit() and EVP_DigestVerifyUpdate() return 1 for success and 0
for failure.

Unlike other functions the return value 0 from EVP_DigestVerifyFinal() only
indicates that the signature did not verify successfully (that is tbs did
not match the original data or the signature was of invalid form) it is not an
indication of a more serious error.
EVP_DigestVerifyFinal() returns 1 for success; any other value indicates
failure. A return value of zero indicates that the signature did not verify
successfully (that is, tbs did not match the original data or the signature had
an invalid form), while other values indicate a more serious error (and
sometimes also indicate an invalid signature form).

The error codes can be obtained from L<ERR_get_error(3)>.

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