=head1 RETURN VALUES
X509_sign(), X509_sign_ctx(), X509_REQ_sign(), X509_REQ_sign_ctx(),
-X509_CRL_sign() and X509_CRL_sign_ctx() return 1 for success and 0
-for failure.
+X509_CRL_sign() and X509_CRL_sign_ctx() return the size of the signature
+in bytes for success and zero for failure.
X509_verify(), X509_REQ_verify() and X509_CRL_verify() return 1 if the
signature is valid and 0 if the signature check fails. If the signature