RSAsign(3) OpenSSL RSAsign(3)

NAME
       RSAsign, RSAverify - RSA signatures

SYNOPSIS
        #include 

        int RSAsign(int type, unsigned char *m, unsigned int mlen,
           unsigned char *sigret, unsigned int *siglen, RSA *rsa);

        int RSAverify(int type, unsigned char *m, unsigned int mlen,
           unsigned char *sigbuf, unsigned int siglen, RSA *rsa);

DESCRIPTION
       RSAsign() signs the message digest mm of size mmlleenn using the private
       key rrssaa as specified in PKCS #1 v2.0. It stores the signature in ssiiggrreett
       and the signature size in ssiigglleenn. ssiiggrreett must point to RSAsize(rrssaa)
       bytes of memory.

       ttyyppee denotes the message digest algorithm that was used to generate mm.
       It usually is one of NNIIDDsshhaa11, NNIIDDrriippeemmdd116600 and NNIIDDmmdd55; see
       objects(3) for details. If ttyyppee is NNIIDDmmdd55sshhaa11, an SSL signature (MD5
       and SHA1 message digests with PKCS #1 padding and no algorithm
       identifier) is created.

       RSAverify() verifies that the signature ssiiggbbuuff of size ssiigglleenn matches
       a given message digest mm of size mmlleenn. ttyyppee denotes the message digest
       algorithm that was used to generate the signature.  rrssaa is the signer's
       public key.

RETURN VALUES
       RSAsign() returns 1 on success, 0 otherwise.  RSAverify() returns 1
       on successful verification, 0 otherwise.

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

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

CCOONNFFOORRMMIINNGG TTOO
       SSL, PKCS #1 v2.0

SEE ALSO
       ERRgeterror(3), objects(3), rsa(3), RSAprivateencrypt(3),
       RSApublicdecrypt(3)

HISTORY       RSAsign() and RSAverify() are available in all versions of SSLeay and
       OpenSSL.



0.9.7l                            2002-09-25                       RSAsign(3)