NAME
RSA_sign, RSA_verify — RSA signatures
Synopsis
#include <openssl/rsa.h>
int
RSA_sign(int type, unsigned char *m, unsigned int m_len, unsigned
char *sigret, unsigned int *siglen, RSA *rsa);
int RSA_verify(int
type, 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).
Restrictions
Certain signatures with an improper algorithm identifier are
accepted for compatibility with SSLeay 0.4.5 :-)
CONFORMING TO
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.
