RSA_sign(3)

     RSA_sign(3)            0.9.6h (2002-09-25)            RSA_sign(3)

     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).

     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 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.

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