RSA_sign - RSA signatures
#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);
RSA_sign(3openssl) OpenSSL RSA_sign(3openssl)
NAME
RSA_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 as specified in PKCS #1 v2.0. 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.
It usually is one of NID_sha1, NID_ripemd160 and NID_md5; see
objects(3) for details. 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, 0 otherwise. RSA_verify() returns 1
on successful verification, 0 otherwise.
The error codes can be obtained by ERR_get_error(3).
BUGS
Certain signatures with an improper algorithm identifier are accepted
for compatibility with SSLeay 0.4.5 :-)
CONFORMING TO
SSL, PKCS #1 v2.0
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
+---------------+--------------------------+
|ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+---------------+--------------------------+
|Availability | library/security/openssl |
+---------------+--------------------------+
|Stability | Pass-through uncommitted |
+---------------+--------------------------+
SEE ALSO
ERR_get_error(3), objects(3), rsa(3), RSA_private_encrypt(3),
RSA_public_decrypt(3)
HISTORY
RSA_sign() and RSA_verify() are available in all versions of SSLeay and
OpenSSL.
NOTES
Source code for open source software components in Oracle Solaris can
be found at https://www.oracle.com/downloads/opensource/solaris-source-
code-downloads.html.
This software was built from source available at
https://github.com/oracle/solaris-userland. The original community
source was downloaded from
https://www.openssl.org/source/openssl-1.0.2ze.tar.gz.
Further information about this software can be found on the open source
community website at https://www.openssl.org/.
1.0.2ze 2022-05-03 RSA_sign(3openssl)