diff options
Diffstat (limited to 'agent/pksign.c')
| -rw-r--r-- | agent/pksign.c | 183 |
1 files changed, 0 insertions, 183 deletions
diff --git a/agent/pksign.c b/agent/pksign.c deleted file mode 100644 index 2acc63dd9..000000000 --- a/agent/pksign.c +++ /dev/null @@ -1,183 +0,0 @@ -/* pksign.c - public key signing (well, acually using a secret key) - * Copyright (C) 2001 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 <config.h> -#include <errno.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <ctype.h> -#include <assert.h> -#include <unistd.h> -#include <sys/stat.h> - -#include "agent.h" - - -static int -do_encode_md (const unsigned char *digest, size_t digestlen, int algo, - unsigned int nbits, GCRY_MPI *r_val) -{ - int nframe = (nbits+7) / 8; - byte *frame; - int i, n; - byte asn[100]; - size_t asnlen; - - asnlen = DIM(asn); - if (gcry_md_algo_info (algo, GCRYCTL_GET_ASNOID, asn, &asnlen)) - { - log_error ("no object identifier for algo %d\n", algo); - return GNUPG_Internal_Error; - } - - if (digestlen + asnlen + 4 > nframe ) - { - log_error ("can't encode a %d bit MD into a %d bits frame\n", - (int)(digestlen*8), (int)nbits); - return GNUPG_Internal_Error; - } - - /* We encode the MD in this way: - * - * 0 1 PAD(n bytes) 0 ASN(asnlen bytes) MD(len bytes) - * - * PAD consists of FF bytes. - */ - frame = xtrymalloc (nframe); - if (!frame) - return GNUPG_Out_Of_Core; - n = 0; - frame[n++] = 0; - frame[n++] = 1; /* block type */ - i = nframe - digestlen - asnlen -3 ; - assert ( i > 1 ); - memset ( frame+n, 0xff, i ); n += i; - frame[n++] = 0; - memcpy ( frame+n, asn, asnlen ); n += asnlen; - memcpy ( frame+n, digest, digestlen ); n += digestlen; - assert ( n == nframe ); - if (DBG_CRYPTO) - log_printhex ("encoded hash:", frame, nframe); - - gcry_mpi_scan (r_val, GCRYMPI_FMT_USG, frame, &nframe); - xfree (frame); - return 0; -} - - -/* SIGN whatever information we have accumulated in CTRL and write it - back to OUTFP. */ -int -agent_pksign (CTRL ctrl, FILE *outfp, int ignore_cache) -{ - GCRY_SEXP s_skey = NULL, s_hash = NULL, s_sig = NULL; - GCRY_MPI frame = NULL; - unsigned char *shadow_info = NULL; - int rc; - char *buf = NULL; - size_t len; - - if (!ctrl->have_keygrip) - return seterr (No_Secret_Key); - - s_skey = agent_key_from_file (ctrl->keygrip, &shadow_info, ignore_cache); - if (!s_skey && !shadow_info) - { - log_error ("failed to read the secret key\n"); - rc = seterr (No_Secret_Key); - goto leave; - } - - if (!s_skey) - { /* divert operation to the smartcard */ - unsigned char *sigbuf; - - rc = divert_pksign (ctrl->digest.value, - ctrl->digest.valuelen, - ctrl->digest.algo, - shadow_info, &sigbuf); - if (rc) - { - log_error ("smartcard signing failed: %s\n", gnupg_strerror (rc)); - goto leave; - } - len = gcry_sexp_canon_len (sigbuf, 0, NULL, NULL); - assert (len); - buf = sigbuf; - } - else - { /* no smartcard, but a private key */ - - /* put the hash into a sexp */ - rc = do_encode_md (ctrl->digest.value, - ctrl->digest.valuelen, - ctrl->digest.algo, - gcry_pk_get_nbits (s_skey), - &frame); - if (rc) - goto leave; - if ( gcry_sexp_build (&s_hash, NULL, "%m", frame) ) - BUG (); - - if (DBG_CRYPTO) - { - log_debug ("skey: "); - gcry_sexp_dump (s_skey); - } - - /* sign */ - rc = gcry_pk_sign (&s_sig, s_hash, s_skey); - if (rc) - { - log_error ("signing failed: %s\n", gcry_strerror (rc)); - rc = map_gcry_err (rc); - goto leave; - } - - if (DBG_CRYPTO) - { - log_debug ("result: "); - gcry_sexp_dump (s_sig); - } - - len = gcry_sexp_sprint (s_sig, GCRYSEXP_FMT_CANON, NULL, 0); - assert (len); - buf = xmalloc (len); - len = gcry_sexp_sprint (s_sig, GCRYSEXP_FMT_CANON, buf, len); - assert (len); - } - - /* FIXME: we must make sure that no buffering takes place or we are - in full control of the buffer memory (easy to do) - should go - into assuan. */ - fwrite (buf, 1, len, outfp); - - leave: - gcry_sexp_release (s_skey); - gcry_sexp_release (s_hash); - gcry_sexp_release (s_sig); - gcry_mpi_release (frame); - xfree (buf); - xfree (shadow_info); - return rc; -} - - |