NAME    [Toc]    [Back]

       RSA_sign, RSA_verify - RSA signatures

SYNOPSIS    [Toc]    [Back]

        #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    [Toc]    [Back]

       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    [Toc]    [Back]

       RSA_sign() returns 1 on success, 0 otherwise.  RSA_ver-
       ify() returns 1 on successful verification, 0 otherwise.

       The error codes can be obtained by ERR_get_error(3).

BUGS    [Toc]    [Back]

       Certain signatures with an improper algorithm identifier
       are accepted for compatibility with SSLeay 0.4.5 :-)

CONFORMING TO    [Toc]    [Back]

       SSL, PKCS #1 v2.0

SEE ALSO    [Toc]    [Back]

       ERR_get_error(3), objects(3), rsa(3),
       RSA_private_encrypt(3), RSA_public_decrypt(3)

HISTORY    [Toc]    [Back]

       RSA_sign() and RSA_verify() are available in all versions
       of SSLeay and OpenSSL.


OpenBSD 3.6                 2000-04-03                          1