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