RSA_SIGN - Online Linux Manual Page

Section : 3
Updated : 2021-03-26
Source : 1.1.1k
Note : OpenSSL
NAMERSA_sign, RSA_verify − RSA signatures
SYNOPSIS​ #include <openssl/rsa.h> ​ ​ 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​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. ​RSA_verify() returns 1 on successful verification. 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)
COPYRIGHTCopyright 2000−2016 The OpenSSL Project Authors. All Rights Reserved. Licensed under the OpenSSL license (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>. 0
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