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.
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 :-)
SSL, PKCS #1 v2.0
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.
