mirror of git://git.gnupg.org/gnupg.git
159 lines
4.5 KiB
C
159 lines
4.5 KiB
C
/* keybox-search.c - Search operations
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* Copyright (C) 2001 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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#include <config.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include "keybox-defs.h"
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/****************
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* Check whether the given fingerprint (20 bytes) is in the
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* given keyblob. fpr is always 20 bytes.
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* Return: 0 = found
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* -1 = not found
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other = error (fixme: do not always reurn gpgerr_general)
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*/
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int
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keybox_blob_has_fpr ( KEYBOXBLOB blob, const byte *fpr )
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{
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ulong n, nkeys, keyinfolen;
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const byte *p, *pend;
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byte *buffer = blob->blob;
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size_t buflen = blob->bloblen;
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if ( buflen < 40 )
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return GPGERR_GENERAL; /* blob too short */
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n = get32( buffer );
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if ( n > buflen )
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return GPGERR_GENERAL; /* blob larger than announced length */
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buflen = n; /* ignore trailing stuff */
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pend = buffer + n - 1;
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if ( buffer[4] != 2 )
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return GPGERR_GENERAL; /* invalid blob type */
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if ( buffer[5] != 1 )
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return GPGERR_GENERAL; /* invalid blob format version */
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nkeys = get16( buffer + 16 );
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keyinfolen = get16( buffer + 18 );
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p = buffer + 20;
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for(n=0; n < nkeys; n++, p += keyinfolen ) {
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if ( p+20 > pend )
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return GPGERR_GENERAL; /* blob shorter than required */
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if (!memcmp ( p, fpr, 20 ) )
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return 0; /* found */
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}
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return -1;
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}
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/****************
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* Check whether the given keyID (20 bytes) is in the
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* given keyblob.
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* Return: 0 = found
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* -1 = not found
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other = error (fixme: do not always return gpgerr_general)
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*/
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int
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keybox_blob_has_kid ( KEYBOXBLOB blob, const byte *keyidbuf, size_t keyidlen )
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{
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ulong n, nkeys, keyinfolen, off;
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const byte *p, *pend;
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byte *buffer = blob->blob;
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size_t buflen = blob->bloblen;
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if ( buflen < 40 )
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return GPGERR_GENERAL; /* blob too short */
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n = get32( buffer );
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if ( n > buflen )
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return GPGERR_GENERAL; /* blob larger than announced length */
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buflen = n; /* ignore trailing stuff */
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pend = buffer + n - 1;
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if ( buffer[4] != 2 )
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return GPGERR_GENERAL; /* invalid blob type */
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if ( buffer[5] != 1 )
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return GPGERR_GENERAL; /* invalid blob format version */
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nkeys = get16( buffer + 16 );
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keyinfolen = get16( buffer + 18 );
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p = buffer + 20;
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for(n=0; n < nkeys; n++, p += keyinfolen ) {
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if ( p+24 > pend )
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return GPGERR_GENERAL; /* blob shorter than required */
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off = get32 ( p + 20 );
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if (keyidlen < 8 ) /* actually keyidlen may either be 4 or 8 */
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off +=4;
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if ( off+keyidlen > buflen )
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return GPGERR_GENERAL; /* offset out of bounds */
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if ( !memcmp ( buffer+off, keyidbuf, keyidlen ) )
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return 0; /* found */
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}
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return -1;
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}
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int
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keybox_blob_has_uid ( KEYBOXBLOB blob,
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int (*cmp)(const byte *, size_t, void *), void *opaque )
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{
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ulong n, nuids, uidinfolen, off, len;
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const byte *p, *pend;
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byte *buffer = blob->blob;
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size_t buflen = blob->bloblen;
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if ( buflen < 40 )
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return GPGERR_GENERAL; /* blob too short */
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n = get32( buffer );
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if ( n > buflen )
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return GPGERR_GENERAL; /* blob larger than announced length */
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buflen = n; /* ignore trailing stuff */
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pend = buffer + n - 1;
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if ( buffer[4] != 2 )
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return GPGERR_GENERAL; /* invalid blob type */
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if ( buffer[5] != 1 )
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return GPGERR_GENERAL; /* invalid blob format version */
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p = buffer + 20 + get16( buffer + 16 ) * get16( buffer + 18 );
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if ( p+4 > pend )
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return GPGERR_GENERAL; /* blob shorter than required */
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nuids = get16( p ); p+= 2;
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uidinfolen = get16( p ); p+=2;
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for(n=0; n < nuids; n++, p += uidinfolen ) {
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if ( p+8 > pend )
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return GPGERR_GENERAL; /* blob shorter than required */
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off = get32 ( p );
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len = get32 ( p + 4 );
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if ( off+len > buflen )
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return GPGERR_GENERAL; /* offset out of bounds */
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if ( (*cmp) ( buffer+off, len, opaque ) )
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return 0; /* found */
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}
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return -1;
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}
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