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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.
-Note that PKCS #1 adds meta-data, placing limits on the size of the
-key that can be used.
-See L<RSA_private_encrypt(3)|RSA_private_encrypt(3)> for lower-level
-operations.
-
-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