1RSA_SIGN(3ossl)                     OpenSSL                    RSA_SIGN(3ossl)
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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       The following functions have been deprecated since OpenSSL 3.0, and can
12       be hidden entirely by defining OPENSSL_API_COMPAT with a suitable
13       version value, see openssl_user_macros(7):
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15        int RSA_sign(int type, const unsigned char *m, unsigned int m_len,
16                     unsigned char *sigret, unsigned int *siglen, RSA *rsa);
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18        int RSA_verify(int type, const unsigned char *m, unsigned int m_len,
19                       unsigned char *sigbuf, unsigned int siglen, RSA *rsa);
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DESCRIPTION

22       All of the functions described on this page are deprecated.
23       Applications should instead use EVP_PKEY_sign_init(3),
24       EVP_PKEY_sign(3), EVP_PKEY_verify_init(3) and EVP_PKEY_verify(3).
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26       RSA_sign() signs the message digest m of size m_len using the private
27       key rsa using RSASSA-PKCS1-v1_5 as specified in RFC 3447. It stores the
28       signature in sigret and the signature size in siglen.  sigret must
29       point to RSA_size(rsa) bytes of memory.  Note that PKCS #1 adds meta-
30       data, placing limits on the size of the key that can be used.  See
31       RSA_private_encrypt(3) for lower-level operations.
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33       type denotes the message digest algorithm that was used to generate m.
34       If type is NID_md5_sha1, an SSL signature (MD5 and SHA1 message digests
35       with PKCS #1 padding and no algorithm identifier) is created.
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37       RSA_verify() verifies that the signature sigbuf of size siglen matches
38       a given message digest m of size m_len. type denotes the message digest
39       algorithm that was used to generate the signature.  rsa is the signer's
40       public key.
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RETURN VALUES

43       RSA_sign() returns 1 on success and 0 for failure.  RSA_verify()
44       returns 1 on successful verification and 0 for failure.
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46       The error codes can be obtained by ERR_get_error(3).
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CONFORMING TO

49       SSL, PKCS #1 v2.0
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SEE ALSO

52       ERR_get_error(3), RSA_private_encrypt(3), RSA_public_decrypt(3)
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HISTORY

55       All of these functions were deprecated in OpenSSL 3.0.
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58       Copyright 2000-2022 The OpenSSL Project Authors. All Rights Reserved.
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60       Licensed under the Apache License 2.0 (the "License").  You may not use
61       this file except in compliance with the License.  You can obtain a copy
62       in the file LICENSE in the source distribution or at
63       <https://www.openssl.org/source/license.html>.
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673.1.1                             2023-08-31                   RSA_SIGN(3ossl)
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