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