1RSA_SIGN(3)                         OpenSSL                        RSA_SIGN(3)
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NAME

6       RSA_sign, RSA_verify - RSA signatures
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SYNOPSIS

9        #include <openssl/rsa.h>
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11        int RSA_sign(int type, const unsigned char *m, unsigned int m_len,
12                     unsigned char *sigret, unsigned int *siglen, RSA *rsa);
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14        int RSA_verify(int type, const unsigned char *m, unsigned int m_len,
15                       unsigned char *sigbuf, unsigned int siglen, RSA *rsa);
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DESCRIPTION

18       RSA_sign() signs the message digest m of size m_len using the private
19       key rsa using RSASSA-PKCS1-v1_5 as specified in RFC 3447. It stores the
20       signature in sigret and the signature size in siglen.  sigret must
21       point to RSA_size(rsa) bytes of memory.  Note that PKCS #1 adds meta-
22       data, placing limits on the size of the key that can be used.  See
23       RSA_private_encrypt(3) for lower-level operations.
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25       type denotes the message digest algorithm that was used to generate m.
26       If type is NID_md5_sha1, an SSL signature (MD5 and SHA1 message digests
27       with PKCS #1 padding and no algorithm identifier) is created.
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29       RSA_verify() verifies that the signature sigbuf of size siglen matches
30       a given message digest m of size m_len. type denotes the message digest
31       algorithm that was used to generate the signature.  rsa is the signer's
32       public key.
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RETURN VALUES

35       RSA_sign() returns 1 on success.  RSA_verify() returns 1 on successful
36       verification.
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38       The error codes can be obtained by ERR_get_error(3).
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CONFORMING TO

41       SSL, PKCS #1 v2.0
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SEE ALSO

44       ERR_get_error(3), RSA_private_encrypt(3), RSA_public_decrypt(3)
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47       Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
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49       Licensed under the OpenSSL license (the "License").  You may not use
50       this file except in compliance with the License.  You can obtain a copy
51       in the file LICENSE in the source distribution or at
52       <https://www.openssl.org/source/license.html>.
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561.1.1q                            2023-02-06                       RSA_SIGN(3)
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