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=pod
=head1 NAME
RSA_sign, RSA_verify - RSA signatures
=head1 SYNOPSIS
#include <openssl/rsa.h>
int RSA_sign(int type, const unsigned char *m, unsigned int m_len,
unsigned char *sigret, unsigned int *siglen, RSA *rsa);
int RSA_verify(int type, const unsigned char *m, unsigned int m_len,
unsigned char *sigbuf, unsigned int siglen, RSA *rsa);
=head1 DESCRIPTION
RSA_sign() signs the message digest B<m> of size B<m_len> using the
private key B<rsa> as specified in PKCS #1 v2.0. It stores the
signature in B<sigret> and the signature size in B<siglen>. B<sigret>
must point to RSA_size(B<rsa>) bytes of memory.
B<type> denotes the message digest algorithm that was used to generate
B<m>. It usually is one of B<NID_sha1>, B<NID_ripemd160> and B<NID_md5>;
see L<objects(3)|objects(3)> for details. If B<type> is B<NID_md5_sha1>,
an SSL signature (MD5 and SHA1 message digests with PKCS #1 padding
and no algorithm identifier) is created.
RSA_verify() verifies that the signature B<sigbuf> of size B<siglen>
matches a given message digest B<m> of size B<m_len>. B<type> denotes
the message digest algorithm that was used to generate the signature.
B<rsa> is the signer's public key.
=head1 RETURN VALUES
RSA_sign() returns 1 on success, 0 otherwise. RSA_verify() returns 1
on successful verification, 0 otherwise.
The error codes can be obtained by L<ERR_get_error(3)|ERR_get_error(3)>.
=head1 BUGS
Certain signatures with an improper algorithm identifier are accepted
for compatibility with SSLeay 0.4.5 :-)
=head1 CONFORMING TO
SSL, PKCS #1 v2.0
=head1 SEE ALSO
L<ERR_get_error(3)|ERR_get_error(3)>, L<objects(3)|objects(3)>,
L<rsa(3)|rsa(3)>, L<RSA_private_encrypt(3)|RSA_private_encrypt(3)>,
L<RSA_public_decrypt(3)|RSA_public_decrypt(3)>
=head1 HISTORY
RSA_sign() and RSA_verify() are available in all versions of SSLeay
and OpenSSL.
=cut
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