f4401cd869
alter des.h to be friendly with openssl/des.h (you can include both in the same file) make libkrb to depend on libdes. bump major. massage various portioin of heimdal to be friendly with openssl 0.9.7b.
207 lines
6.3 KiB
Groff
207 lines
6.3 KiB
Groff
.\" $NetBSD: DSA_sign.3,v 1.12 2003/07/24 14:16:39 itojun Exp $
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.\" Thu Jul 24 13:07:55 2003
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.\" ======================================================================
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.\"
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.IX Title "DSA_sign 3"
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.TH DSA_sign 3 "0.9.7b" "2002-09-25" "OpenSSL"
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.UC
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.SH "NAME"
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DSA_sign, DSA_sign_setup, DSA_verify \- \s-1DSA\s0 signatures
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.SH "LIBRARY"
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libcrypto, -lcrypto
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/dsa.h>
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.Ve
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.Vb 2
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\& int DSA_sign(int type, const unsigned char *dgst, int len,
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\& unsigned char *sigret, unsigned int *siglen, DSA *dsa);
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.Ve
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.Vb 2
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\& int DSA_sign_setup(DSA *dsa, BN_CTX *ctx, BIGNUM **kinvp,
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\& BIGNUM **rp);
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.Ve
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.Vb 2
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\& int DSA_verify(int type, const unsigned char *dgst, int len,
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\& unsigned char *sigbuf, int siglen, DSA *dsa);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fIDSA_sign()\fR computes a digital signature on the \fBlen\fR byte message
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digest \fBdgst\fR using the private key \fBdsa\fR and places its \s-1ASN\s0.1 \s-1DER\s0
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encoding at \fBsigret\fR. The length of the signature is places in
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*\fBsiglen\fR. \fBsigret\fR must point to DSA_size(\fBdsa\fR) bytes of memory.
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.PP
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\&\fIDSA_sign_setup()\fR may be used to precompute part of the signing
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operation in case signature generation is time-critical. It expects
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\&\fBdsa\fR to contain \s-1DSA\s0 parameters. It places the precomputed values
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in newly allocated \fB\s-1BIGNUM\s0\fRs at *\fBkinvp\fR and *\fBrp\fR, after freeing
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the old ones unless *\fBkinvp\fR and *\fBrp\fR are \s-1NULL\s0. These values may
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be passed to \fIDSA_sign()\fR in \fBdsa->kinv\fR and \fBdsa->r\fR.
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\&\fBctx\fR is a pre-allocated \fB\s-1BN_CTX\s0\fR or \s-1NULL\s0.
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.PP
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\&\fIDSA_verify()\fR verifies that the signature \fBsigbuf\fR of size \fBsiglen\fR
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matches a given message digest \fBdgst\fR of size \fBlen\fR.
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\&\fBdsa\fR is the signer's public key.
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.PP
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The \fBtype\fR parameter is ignored.
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.PP
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The \s-1PRNG\s0 must be seeded before \fIDSA_sign()\fR (or \fIDSA_sign_setup()\fR)
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is called.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fIDSA_sign()\fR and \fIDSA_sign_setup()\fR return 1 on success, 0 on error.
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\&\fIDSA_verify()\fR returns 1 for a valid signature, 0 for an incorrect
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signature and \-1 on error. The error codes can be obtained by
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ERR_get_error(3).
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.SH "CONFORMING TO"
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.IX Header "CONFORMING TO"
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\&\s-1US\s0 Federal Information Processing Standard \s-1FIPS\s0 186 (Digital Signature
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Standard, \s-1DSS\s0), \s-1ANSI\s0 X9.30
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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openssl_dsa(3), ERR_get_error(3), openssl_rand(3),
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DSA_do_sign(3)
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.SH "HISTORY"
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.IX Header "HISTORY"
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\&\fIDSA_sign()\fR and \fIDSA_verify()\fR are available in all versions of SSLeay.
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\&\fIDSA_sign_setup()\fR was added in SSLeay 0.8.
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