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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);

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.



50                                               2013-03-05                                      RSA_sign(3)