Manual Pages for UNIX Operating System command usage for man DSA_verify

OpenSSL                                        DSA_sign(3openssl)



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     DSA_sign, DSA_sign_setup, DSA_verify - DSA signatures

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      #include 

      int    DSA_sign(int type, const unsigned char *dgst, int len,
                     unsigned char *sigret, unsigned int *siglen, DSA *dsa);

      int    DSA_sign_setup(DSA *dsa, BN_CTX *ctx, BIGNUM **kinvp,
                     BIGNUM **rp);

      int    DSA_verify(int type, const unsigned char *dgst, int len,
                     unsigned char *sigbuf, int siglen, DSA *dsa);


DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN
     DSA_sign() computes a digital signature on the lllleeeennnn byte
     message digest ddddggggsssstttt using the private key ddddssssaaaa and places its
     ASN.1 DER encoding at ssssiiiiggggrrrreeeetttt. The length of the signature is
     places in *ssssiiiigggglllleeeennnn. ssssiiiiggggrrrreeeetttt must point to DSA_size(ddddssssaaaa) bytes
     of memory.

     DSA_sign_setup() may be used to precompute part of the
     signing operation in case signature generation is time-
     critical. It expects ddddssssaaaa to contain DSA parameters. It
     places the precomputed values in newly allocated BBBBIIIIGGGGNNNNUUUUMMMMs at
     *kkkkiiiinnnnvvvvpppp and *rrrrpppp, after freeing the old ones unless *kkkkiiiinnnnvvvvpppp and
     *rrrrpppp are NULL. These values may be passed to DSA_sign() in
     ddddssssaaaa---->>>>kkkkiiiinnnnvvvv and ddddssssaaaa---->>>>rrrr.  ccccttttxxxx is a pre-allocated BBBBNNNN_CCCCTTTTXXXX or
     NULL.

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

     The ttttyyyyppppeeee parameter is ignored.

     The PRNG must be seeded before DSA_sign() (or
     DSA_sign_setup()) is called.

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     DSA_sign() and DSA_sign_setup() return 1 on success, 0 on
     error.  DSA_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).

CCCCOOOONNNNFFFFOOOORRRRMMMMIIIINNNNGGGG TTTTOOOO
     US Federal Information Processing Standard FIPS 186 (Digital
     Signature Standard, DSS), ANSI X9.30





25/Sep/2002            Last change: 0.9.8o                      1






OpenSSL                                        DSA_sign(3openssl)



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     dsa(3), ERR_get_error(3), rand(3), DSA_do_sign(3)

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     DSA_sign() and DSA_verify() are available in all versions of
     SSLeay.  DSA_sign_setup() was added in SSLeay 0.8.

















































25/Sep/2002            Last change: 0.9.8o                      2