OpenGrok

DSA_sign.3 revision 1.4.4.1.6.1

$NetBSD: DSA_sign.3,v 1.4.4.1.6.1 2014/04/08 11:44:27 msaitoh Exp $

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.tr \(*W- . ds -- \(*W- . ds PI pi . if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch . if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch . ds L" "" . ds R" "" . ds C` "" . ds C' "" 'br\} . ds -- \|\(em\| . ds PI \(*p . ds L" `` . ds R" '' . ds C` . ds C' 'br\}
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Title "DSA_sign 3" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
.nh DSA_sign, DSA_sign_setup, DSA_verify - DSA signatures libcrypto, -lcrypto Header "SYNOPSIS" .Vb 1 #include <openssl/dsa.h> \& 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); .Ve Header "DESCRIPTION" \fIDSA_sign() computes a digital signature on the len byte message digest dgst using the private key dsa and places its \s-1ASN.1 DER\s0 encoding at sigret. The length of the signature is places in *siglen. sigret must point to DSA_size(dsa) bytes of memory.

\fIDSA_sign_setup() may be used to precompute part of the signing operation in case signature generation is time-critical. It expects \fBdsa to contain \s-1DSA\s0 parameters. It places the precomputed values in newly allocated \s-1BIGNUM\s0s at *kinvp and *rp, after freeing the old ones unless *kinvp and *rp are \s-1NULL.\s0 These values may be passed to DSA_sign() in dsa->kinv and dsa->r. \fBctx is a pre-allocated \s-1BN_CTX\s0 or \s-1NULL.\s0

\fIDSA_verify() verifies that the signature sigbuf of size siglen matches a given message digest dgst of size len. \fBdsa is the signer's public key.

The type parameter is ignored.

The \s-1PRNG\s0 must be seeded before DSA_sign() (or DSA_sign_setup()) is called.

Header "RETURN VALUES" \fIDSA_sign() and DSA_sign_setup() return 1 on success, 0 on error. \fIDSA_verify() returns 1 for a valid signature, 0 for an incorrect signature and -1 on error. The error codes can be obtained by \fIERR_get_error\|(3). Header "CONFORMING TO" \s-1US\s0 Federal Information Processing Standard \s-1FIPS 186 \s0(Digital Signature Standard, \s-1DSS\s0), \s-1ANSI X9.30\s0 Header "SEE ALSO" \fIopenssl_dsa\|(3), ERR_get_error\|(3), openssl_rand\|(3), \fIDSA_do_sign\|(3) Header "HISTORY" \fIDSA_sign() and DSA_verify() are available in all versions of SSLeay. \fIDSA_sign_setup() was added in SSLeay 0.8.

Indexes created Sat Apr 25 00:22:52 UTC 2026