RSA_sign(3) OpenSSL RSA_sign(3)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);
DESCRIPTIONRSA_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.
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 identi‐
fier) 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 VALUESRSA_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
SEE ALSOERR_get_error(3), objects(3), rsa(3), RSA_private_encrypt(3), RSA_pub‐
lic_decrypt(3)HISTORYRSA_sign() and RSA_verify() are available in all versions of SSLeay and
OpenSSL.
0.9.8k 2009-05-20 RSA_sign(3)
