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PKCS #1 v2.0 is the name of a document which specifies an algorithm RSASSA-PKCS1-v1_5, often referred to as "PKCS #1 v1.5" after an earlier document which specified it. This gets further confusing because the document PKCS #1 v2.1 specifies two signature algorithms, RSASSA-PKCS1-v1_5 and RSASSA-PSS. RSA_sign implements RSASSA-PKCS1-v1_5. Refer to the document using the RFC number which is easier to find anyway, and refer to the algorithm by its name. Reviewed-by: Kurt Roeckx <kurt@roeckx.be> Reviewed-by: Rich Salz <rsalz@openssl.org> GH: #1474
66 lines
1.9 KiB
Plaintext
66 lines
1.9 KiB
Plaintext
=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> using RSASSA-PKCS1-v1_5 as specified in RFC 3447. It
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stores the signature in B<sigret> and the signature size in B<siglen>.
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B<sigret> 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)> 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>.
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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.
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RSA_verify() returns 1 on successful verification.
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The error codes can be obtained by L<ERR_get_error(3)>.
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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)>,
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L<RSA_private_encrypt(3)>,
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L<RSA_public_decrypt(3)>
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=head1 COPYRIGHT
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Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the OpenSSL license (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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