NAME

       RSA_sign, RSA_verify - RSA signatures

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>.