/* dsa.c * Copyright (C) 1998 Free Software Foundation, Inc. * * This file is part of GNUPG. * * GNUPG is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * GNUPG is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA */ #include #include #include #include #include #include #include "options.h" #include "packet.h" #include "errors.h" #include "iobuf.h" #include "keydb.h" #include "memory.h" #include "util.h" #include "main.h" void g10_dsa_sign( PKT_secret_cert *skc, PKT_signature *sig, MD_HANDLE md, int digest_algo ) { DSA_secret_key skey; MPI frame; byte *dp; assert( sig->pubkey_algo == PUBKEY_ALGO_DSA ); if( !digest_algo ) digest_algo = md_get_algo(md); dp = md_read( md, digest_algo ); keyid_from_skc( skc, sig->keyid ); sig->digest_algo = digest_algo; sig->digest_start[0] = dp[0]; sig->digest_start[1] = dp[1]; sig->d.dsa.r = mpi_alloc( mpi_get_nlimbs(skc->d.dsa.p) ); sig->d.dsa.s = mpi_alloc( mpi_get_nlimbs(skc->d.dsa.p) ); frame = encode_md_value( md, mpi_get_nbits(skc->d.dsa.p)); skey.p = skc->d.elg.p; skey.g = skc->d.elg.g; skey.y = skc->d.elg.y; skey.x = skc->d.elg.x; dsa_sign( sig->d.dsa.r, sig->d.dsa.s, frame, &skey); memset( &skey, 0, sizeof skey ); mpi_free(frame); if( opt.verbose ) { char *ustr = get_user_id_string( sig->keyid ); log_info("DSA signature from: %s\n", ustr ); m_free(ustr); } }