1=pod 2 3=head1 NAME 4 5RSA_sign, RSA_verify - RSA signatures 6 7=head1 SYNOPSIS 8 9 #include <openssl/rsa.h> 10 11 int RSA_sign(int type, const unsigned char *m, unsigned int m_len, 12 unsigned char *sigret, unsigned int *siglen, RSA *rsa); 13 14 int RSA_verify(int type, const unsigned char *m, unsigned int m_len, 15 unsigned char *sigbuf, unsigned int siglen, RSA *rsa); 16 17=head1 DESCRIPTION 18 19RSA_sign() signs the message digest B<m> of size B<m_len> using the 20private key B<rsa> using RSASSA-PKCS1-v1_5 as specified in RFC 3447. It 21stores the signature in B<sigret> and the signature size in B<siglen>. 22B<sigret> must point to RSA_size(B<rsa>) bytes of memory. 23Note that PKCS #1 adds meta-data, placing limits on the size of the 24key that can be used. 25See L<RSA_private_encrypt(3)> for lower-level 26operations. 27 28B<type> denotes the message digest algorithm that was used to generate 29B<m>. 30If B<type> is B<NID_md5_sha1>, 31an SSL signature (MD5 and SHA1 message digests with PKCS #1 padding 32and no algorithm identifier) is created. 33 34RSA_verify() verifies that the signature B<sigbuf> of size B<siglen> 35matches a given message digest B<m> of size B<m_len>. B<type> denotes 36the message digest algorithm that was used to generate the signature. 37B<rsa> is the signer's public key. 38 39=head1 RETURN VALUES 40 41RSA_sign() returns 1 on success. 42RSA_verify() returns 1 on successful verification. 43 44The error codes can be obtained by L<ERR_get_error(3)>. 45 46=head1 CONFORMING TO 47 48SSL, PKCS #1 v2.0 49 50=head1 SEE ALSO 51 52L<ERR_get_error(3)>, 53L<RSA_private_encrypt(3)>, 54L<RSA_public_decrypt(3)> 55 56=head1 COPYRIGHT 57 58Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved. 59 60Licensed under the OpenSSL license (the "License"). You may not use 61this file except in compliance with the License. You can obtain a copy 62in the file LICENSE in the source distribution or at 63L<https://www.openssl.org/source/license.html>. 64 65=cut 66