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RSA_sign(3)                         OpenSSL                        RSA_sign(3)



NAME
       RSA_sign, RSA_verify - RSA signatures

LIBRARY
       libcrypto, -lcrypto

SYNOPSIS
        #include <openssl/rsa.h>

       The following functions have been deprecated since OpenSSL 3.0, and can
       be hidden entirely by defining OPENSSL_API_COMPAT with a suitable
       version value, see openssl_user_macros(7):

        int RSA_sign(int type, const unsigned char *m, unsigned int m_len,
                     unsigned char *sigret, unsigned int *siglen, RSA *rsa);

        int RSA_verify(int type, const unsigned char *m, unsigned int m_len,
                       unsigned char *sigbuf, unsigned int siglen, RSA *rsa);

DESCRIPTION
       All of the functions described on this page are deprecated.
       Applications should instead use EVP_PKEY_sign_init(3),
       EVP_PKEY_sign(3), EVP_PKEY_verify_init(3) and EVP_PKEY_verify(3).

       RSA_sign() signs the message digest m of size m_len using the private
       key rsa using RSASSA-PKCS1-v1_5 as specified in RFC 3447. It stores the
       signature in sigret and the signature size in siglen.  sigret must
       point to RSA_size(rsa) bytes of memory.  Note that PKCS #1 adds meta-
       data, placing limits on the size of the key that can be used.  See
       RSA_private_encrypt(3) for lower-level operations.

       type denotes the message digest algorithm that was used to generate m.
       If type is NID_md5_sha1, an SSL signature (MD5 and SHA1 message digests
       with PKCS #1 padding and no algorithm identifier) is created.

       RSA_verify() verifies that the signature sigbuf of size siglen matches
       a given message digest m of size m_len. type denotes the message digest
       algorithm that was used to generate the signature.  rsa is the signer's
       public key.

RETURN VALUES
       RSA_sign() returns 1 on success and 0 for failure.  RSA_verify()
       returns 1 on successful verification and 0 for failure.

       The error codes can be obtained by ERR_get_error(3).

CONFORMING TO
       SSL, PKCS #1 v2.0

SEE ALSO
       ERR_get_error(3), RSA_private_encrypt(3), RSA_public_decrypt(3)

HISTORY
       All of these functions were deprecated in OpenSSL 3.0.

COPYRIGHT
       Copyright 2000-2021 The OpenSSL Project Authors. All Rights Reserved.

       Licensed under the Apache License 2.0 (the "License").  You may not use
       this file except in compliance with the License.  You can obtain a copy
       in the file LICENSE in the source distribution or at
       <https://www.openssl.org/source/license.html>.



3.0.12                            2023-05-07                       RSA_sign(3)