Manual Pages for UNIX Operating System command usage for man DSA_do_sign

OpenSSL                                     DSA_do_sign(3openssl)



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     DSA_do_sign, DSA_do_verify - raw DSA signature operations

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      #include 

      DSA_SIG *DSA_do_sign(const unsigned char *dgst, int dlen, DSA *dsa);

      int DSA_do_verify(const unsigned char *dgst, int dgst_len,
                  DSA_SIG *sig, DSA *dsa);


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     DSA_do_sign() computes a digital signature on the lllleeeennnn byte
     message digest ddddggggsssstttt using the private key ddddssssaaaa and returns it
     in a newly allocated DDDDSSSSAAAA_SSSSIIIIGGGG structure.

     DSA_sign_setup(3) may be used to precompute part of the
     signing operation in case signature generation is time-
     critical.

     DSA_do_verify() verifies that the signature ssssiiiigggg matches a
     given message digest ddddggggsssstttt of size lllleeeennnn.  ddddssssaaaa is the signer's
     public key.

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     DSA_do_sign() returns the signature, NULL on error.
     DSA_do_verify() returns 1 for a valid signature, 0 for an
     incorrect signature and -1 on error. The error codes can be
     obtained by ERR_get_error(3).

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     dsa(3), ERR_get_error(3), rand(3), DSA_SIG_new(3),
     DSA_sign(3)

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     DSA_do_sign() and DSA_do_verify() were added in OpenSSL
     0.9.3.

















25/Sep/2002            Last change: 0.9.8o                      1