=pod
=head1 NAME
RSA_sign, RSA_verify - RSA signatures
=head1 SYNOPSIS
#include
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 of size B using the
private key B as specified in PKCS #1 v2.0. It stores the
signature in B and the signature size in B. B
must point to RSA_size(B) bytes of memory.
Note that PKCS #1 adds meta-data, placing limits on the size of the
key that can be used.
See L for lower-level
operations.
B denotes the message digest algorithm that was used to generate
B. It usually is one of B, B and B;
see L for details. If B is B,
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 of size B
matches a given message digest B of size B. B denotes
the message digest algorithm that was used to generate the signature.
B 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.
=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, L,
L, L,
L
=head1 HISTORY
RSA_sign() and RSA_verify() are available in all versions of SSLeay
and OpenSSL.
=cut