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Removed files from the HEAD revision, because they are now in another
repository
This commit is contained in:
Werner Koch
parent
edb40153c0
commit
07ca4eaa9d
165 changed files with 0 additions and 35058 deletions
624
mpi/mpicoder.c
624
mpi/mpicoder.c
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@ -1,624 +0,0 @@
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/* mpicoder.c - Coder for the external representation of MPIs
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* Copyright (C) 1998 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 <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <assert.h>
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#include "mpi-internal.h"
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#include "g10lib.h"
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#define MAX_EXTERN_MPI_BITS 16384
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static MPI
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mpi_read_from_buffer(byte *buffer, unsigned *ret_nread, int secure)
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{
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int i, j;
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unsigned nbits, nbytes, nlimbs, nread=0;
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mpi_limb_t a;
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MPI val = MPI_NULL;
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if( *ret_nread < 2 )
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goto leave;
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nbits = buffer[0] << 8 | buffer[1];
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if( nbits > MAX_EXTERN_MPI_BITS ) {
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log_error("mpi too large (%u bits)\n", nbits);
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goto leave;
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}
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buffer += 2;
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nread = 2;
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nbytes = (nbits+7) / 8;
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nlimbs = (nbytes+BYTES_PER_MPI_LIMB-1) / BYTES_PER_MPI_LIMB;
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val = secure? mpi_alloc_secure( nlimbs )
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: mpi_alloc( nlimbs );
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i = BYTES_PER_MPI_LIMB - nbytes % BYTES_PER_MPI_LIMB;
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i %= BYTES_PER_MPI_LIMB;
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j= val->nlimbs = nlimbs;
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val->sign = 0;
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for( ; j > 0; j-- ) {
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a = 0;
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for(; i < BYTES_PER_MPI_LIMB; i++ ) {
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if( ++nread > *ret_nread )
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log_bug("mpi larger than buffer");
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a <<= 8;
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a |= *buffer++;
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}
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i = 0;
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val->d[j-1] = a;
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}
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leave:
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*ret_nread = nread;
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return val;
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}
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/****************
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* Make an mpi from a character string.
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*/
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int
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mpi_fromstr(MPI val, const char *str)
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{
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int hexmode=0, sign=0, prepend_zero=0, i, j, c, c1, c2;
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unsigned nbits, nbytes, nlimbs;
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mpi_limb_t a;
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if( *str == '-' ) {
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sign = 1;
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str++;
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}
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if( *str == '0' && str[1] == 'x' )
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hexmode = 1;
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else
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return 1; /* other bases are not yet supported */
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str += 2;
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nbits = strlen(str)*4;
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if( nbits % 8 )
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prepend_zero = 1;
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nbytes = (nbits+7) / 8;
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nlimbs = (nbytes+BYTES_PER_MPI_LIMB-1) / BYTES_PER_MPI_LIMB;
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if( val->alloced < nlimbs )
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mpi_resize(val, nlimbs );
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i = BYTES_PER_MPI_LIMB - nbytes % BYTES_PER_MPI_LIMB;
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i %= BYTES_PER_MPI_LIMB;
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j= val->nlimbs = nlimbs;
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val->sign = sign;
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for( ; j > 0; j-- ) {
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a = 0;
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for(; i < BYTES_PER_MPI_LIMB; i++ ) {
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if( prepend_zero ) {
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c1 = '0';
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prepend_zero = 0;
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}
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else
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c1 = *str++;
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assert(c1);
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c2 = *str++;
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assert(c2);
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if( c1 >= '0' && c1 <= '9' )
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c = c1 - '0';
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else if( c1 >= 'a' && c1 <= 'f' )
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c = c1 - 'a' + 10;
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else if( c1 >= 'A' && c1 <= 'F' )
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c = c1 - 'A' + 10;
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else {
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mpi_clear(val);
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return 1;
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}
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c <<= 4;
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if( c2 >= '0' && c2 <= '9' )
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c |= c2 - '0';
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else if( c2 >= 'a' && c2 <= 'f' )
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c |= c2 - 'a' + 10;
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else if( c2 >= 'A' && c2 <= 'F' )
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c |= c2 - 'A' + 10;
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else {
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mpi_clear(val);
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return 1;
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}
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a <<= 8;
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a |= c;
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}
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i = 0;
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val->d[j-1] = a;
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}
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return 0;
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}
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/****************
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* print an MPI to the given stream and return the number of characters
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* printed.
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* FIXME: Replace this by the more generic gcry_mpi_print()
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*/
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static int
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mpi_print( FILE *fp, MPI a, int mode )
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{
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int i, n=0;
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if( a == MPI_NULL )
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return fprintf(fp, "[MPI_NULL]");
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if( !mode ) {
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unsigned int n1;
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n1 = mpi_get_nbits(a);
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n += fprintf(fp, "[%u bits]", n1);
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}
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else {
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if( a->sign )
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putc('-', fp);
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#if BYTES_PER_MPI_LIMB == 2
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#define X "4"
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#elif BYTES_PER_MPI_LIMB == 4
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#define X "8"
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#elif BYTES_PER_MPI_LIMB == 8
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#define X "16"
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#else
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#error please define the format here
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#endif
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for(i=a->nlimbs; i > 0 ; i-- ) {
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n += fprintf(fp, i!=a->nlimbs? "%0" X "lX":"%lX", (ulong)a->d[i-1]);
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#undef X
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}
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if( !a->nlimbs )
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putc('0', fp );
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}
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return n;
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}
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void
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g10_log_mpidump( const char *text, MPI a )
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{
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FILE *fp = stderr; /* used to be log_stream() */
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/* FIXME: Replace this function by a g10_log_xxx one */
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fprintf(fp,"%s: ",text);
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mpi_print(fp, a, 1 );
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fputc('\n', fp);
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}
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/****************
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* Return an m_alloced buffer with the MPI (msb first).
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* NBYTES receives the length of this buffer. Caller must free the
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* return string (This function does return a 0 byte buffer with NBYTES
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* set to zero if the value of A is zero. If sign is not NULL, it will
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* be set to the sign of the A.
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*/
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static byte *
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do_get_buffer( MPI a, unsigned *nbytes, int *sign, int force_secure )
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{
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byte *p, *buffer;
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mpi_limb_t alimb;
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int i;
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if( sign )
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*sign = a->sign;
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*nbytes = a->nlimbs * BYTES_PER_MPI_LIMB;
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p = buffer = force_secure || mpi_is_secure(a) ? g10_xmalloc_secure( *nbytes)
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: g10_xmalloc( *nbytes );
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for(i=a->nlimbs-1; i >= 0; i-- ) {
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alimb = a->d[i];
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#if BYTES_PER_MPI_LIMB == 4
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*p++ = alimb >> 24;
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*p++ = alimb >> 16;
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*p++ = alimb >> 8;
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*p++ = alimb ;
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#elif BYTES_PER_MPI_LIMB == 8
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*p++ = alimb >> 56;
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*p++ = alimb >> 48;
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*p++ = alimb >> 40;
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*p++ = alimb >> 32;
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*p++ = alimb >> 24;
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*p++ = alimb >> 16;
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*p++ = alimb >> 8;
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*p++ = alimb ;
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#else
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#error please implement for this limb size.
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#endif
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}
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/* this is sub-optimal but we need to do the shift oepration because
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* the caller has to free the returned buffer */
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for(p=buffer; !*p && *nbytes; p++, --*nbytes )
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;
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if( p != buffer )
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memmove(buffer,p, *nbytes);
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return buffer;
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}
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byte *
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mpi_get_buffer( MPI a, unsigned *nbytes, int *sign )
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{
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return do_get_buffer( a, nbytes, sign, 0 );
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}
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byte *
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mpi_get_secure_buffer( MPI a, unsigned *nbytes, int *sign )
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{
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return do_get_buffer( a, nbytes, sign, 1 );
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}
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/****************
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* Use BUFFER to update MPI.
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*/
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void
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mpi_set_buffer( MPI a, const byte *buffer, unsigned nbytes, int sign )
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{
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const byte *p;
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mpi_limb_t alimb;
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int nlimbs;
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int i;
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nlimbs = (nbytes + BYTES_PER_MPI_LIMB - 1) / BYTES_PER_MPI_LIMB;
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RESIZE_IF_NEEDED(a, nlimbs);
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a->sign = sign;
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for(i=0, p = buffer+nbytes-1; p >= buffer+BYTES_PER_MPI_LIMB; ) {
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#if BYTES_PER_MPI_LIMB == 4
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alimb = *p-- ;
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alimb |= *p-- << 8 ;
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alimb |= *p-- << 16 ;
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alimb |= *p-- << 24 ;
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#elif BYTES_PER_MPI_LIMB == 8
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alimb = (mpi_limb_t)*p-- ;
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alimb |= (mpi_limb_t)*p-- << 8 ;
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alimb |= (mpi_limb_t)*p-- << 16 ;
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alimb |= (mpi_limb_t)*p-- << 24 ;
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alimb |= (mpi_limb_t)*p-- << 32 ;
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alimb |= (mpi_limb_t)*p-- << 40 ;
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alimb |= (mpi_limb_t)*p-- << 48 ;
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alimb |= (mpi_limb_t)*p-- << 56 ;
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#else
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#error please implement for this limb size.
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#endif
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a->d[i++] = alimb;
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}
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if( p >= buffer ) {
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#if BYTES_PER_MPI_LIMB == 4
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alimb = *p-- ;
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if( p >= buffer ) alimb |= *p-- << 8 ;
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if( p >= buffer ) alimb |= *p-- << 16 ;
|
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if( p >= buffer ) alimb |= *p-- << 24 ;
|
||||
#elif BYTES_PER_MPI_LIMB == 8
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alimb = (mpi_limb_t)*p-- ;
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if( p >= buffer ) alimb |= (mpi_limb_t)*p-- << 8 ;
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if( p >= buffer ) alimb |= (mpi_limb_t)*p-- << 16 ;
|
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if( p >= buffer ) alimb |= (mpi_limb_t)*p-- << 24 ;
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if( p >= buffer ) alimb |= (mpi_limb_t)*p-- << 32 ;
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if( p >= buffer ) alimb |= (mpi_limb_t)*p-- << 40 ;
|
||||
if( p >= buffer ) alimb |= (mpi_limb_t)*p-- << 48 ;
|
||||
if( p >= buffer ) alimb |= (mpi_limb_t)*p-- << 56 ;
|
||||
#else
|
||||
#error please implement for this limb size.
|
||||
#endif
|
||||
a->d[i++] = alimb;
|
||||
}
|
||||
a->nlimbs = i;
|
||||
assert( i == nlimbs );
|
||||
}
|
||||
|
||||
|
||||
|
||||
int
|
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gcry_mpi_scan( struct gcry_mpi **ret_mpi, enum gcry_mpi_format format,
|
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const char *buffer, size_t *nbytes )
|
||||
{
|
||||
struct gcry_mpi *a = NULL;
|
||||
unsigned int len;
|
||||
|
||||
len = nbytes? *nbytes : strlen(buffer);
|
||||
|
||||
/* TODO: add a way to allocate the MPI in secure memory
|
||||
* Hmmm: maybe it is better to retrieve this information from
|
||||
* the provided buffer. */
|
||||
#warning secure memory is not used here.
|
||||
if( format == GCRYMPI_FMT_STD ) {
|
||||
const byte *s = buffer;
|
||||
|
||||
a = mpi_alloc( (len+BYTES_PER_MPI_LIMB-1) / BYTES_PER_MPI_LIMB );
|
||||
if( len ) { /* not zero */
|
||||
a->sign = *s & 0x80;
|
||||
if( a->sign ) {
|
||||
/* FIXME: we have to convert from 2compl to magnitude format */
|
||||
mpi_free(a);
|
||||
return GCRYERR_INTERNAL;
|
||||
}
|
||||
else
|
||||
mpi_set_buffer( a, s, len, 0 );
|
||||
}
|
||||
if( ret_mpi ) {
|
||||
mpi_normalize ( a );
|
||||
*ret_mpi = a;
|
||||
}
|
||||
else
|
||||
mpi_free(a);
|
||||
return 0;
|
||||
}
|
||||
else if( format == GCRYMPI_FMT_USG ) {
|
||||
a = mpi_alloc( (len+BYTES_PER_MPI_LIMB-1) / BYTES_PER_MPI_LIMB );
|
||||
if( len ) /* not zero */
|
||||
mpi_set_buffer( a, buffer, len, 0 );
|
||||
if( ret_mpi ) {
|
||||
mpi_normalize ( a );
|
||||
*ret_mpi = a;
|
||||
}
|
||||
else
|
||||
mpi_free(a);
|
||||
return 0;
|
||||
}
|
||||
else if( format == GCRYMPI_FMT_PGP ) {
|
||||
a = mpi_read_from_buffer( (char*)buffer, &len, 0 );
|
||||
if( nbytes )
|
||||
*nbytes = len;
|
||||
if( ret_mpi ) {
|
||||
mpi_normalize ( a );
|
||||
*ret_mpi = a;
|
||||
}
|
||||
else
|
||||
mpi_free(a);
|
||||
return a? 0 : GCRYERR_INV_OBJ;
|
||||
}
|
||||
else if( format == GCRYMPI_FMT_SSH ) {
|
||||
const byte *s = buffer;
|
||||
size_t n;
|
||||
|
||||
if( len < 4 )
|
||||
return GCRYERR_TOO_SHORT;
|
||||
n = s[0] << 24 | s[1] << 16 | s[2] << 8 | s[3];
|
||||
s += 4; len -= 4;
|
||||
if( n > len )
|
||||
return GCRYERR_TOO_LARGE; /* or should it be too_short */
|
||||
|
||||
a = mpi_alloc( (n+BYTES_PER_MPI_LIMB-1) / BYTES_PER_MPI_LIMB );
|
||||
if( len ) { /* not zero */
|
||||
a->sign = *s & 0x80;
|
||||
if( a->sign ) {
|
||||
/* FIXME: we have to convert from 2compl to magnitude format */
|
||||
mpi_free(a);
|
||||
return GCRYERR_INTERNAL;
|
||||
}
|
||||
else
|
||||
mpi_set_buffer( a, s, n, 0 );
|
||||
}
|
||||
if( nbytes )
|
||||
*nbytes = n+4;
|
||||
if( ret_mpi ) {
|
||||
mpi_normalize ( a );
|
||||
*ret_mpi = a;
|
||||
}
|
||||
else
|
||||
mpi_free(a);
|
||||
return 0;
|
||||
}
|
||||
else if( format == GCRYMPI_FMT_HEX ) {
|
||||
if( nbytes )
|
||||
return GCRYERR_INV_ARG; /* can only handle C strings for now */
|
||||
a = mpi_alloc(0);
|
||||
if( mpi_fromstr( a, buffer ) )
|
||||
return GCRYERR_INV_OBJ;
|
||||
if( ret_mpi ) {
|
||||
mpi_normalize ( a );
|
||||
*ret_mpi = a;
|
||||
}
|
||||
else
|
||||
mpi_free(a);
|
||||
return 0;
|
||||
}
|
||||
else
|
||||
return GCRYERR_INV_ARG;
|
||||
}
|
||||
|
||||
/****************
|
||||
* Write a using format into buffer which has a length of *NBYTES.
|
||||
* Returns the number of bytes actually written in nbytes.
|
||||
* Buffer maybe NULL to query the required length of the buffer
|
||||
*/
|
||||
int
|
||||
gcry_mpi_print( enum gcry_mpi_format format, char *buffer, size_t *nbytes,
|
||||
struct gcry_mpi *a )
|
||||
{
|
||||
unsigned int nbits = mpi_get_nbits(a);
|
||||
size_t len;
|
||||
|
||||
if( !nbytes )
|
||||
return GCRYERR_INV_ARG;
|
||||
|
||||
len = *nbytes;
|
||||
*nbytes = 0;
|
||||
if( format == GCRYMPI_FMT_STD ) {
|
||||
char *tmp;
|
||||
int extra = 0;
|
||||
unsigned int n;
|
||||
|
||||
if( a->sign )
|
||||
return GCRYERR_INTERNAL; /* can't handle it yet */
|
||||
|
||||
tmp = mpi_get_buffer( a, &n, NULL );
|
||||
if( n && (*tmp & 0x80) ) {
|
||||
n++;
|
||||
extra=1;
|
||||
}
|
||||
|
||||
if( n > len && buffer ) {
|
||||
g10_free(tmp);
|
||||
return GCRYERR_TOO_SHORT; /* the provided buffer is too short */
|
||||
}
|
||||
if( buffer ) {
|
||||
byte *s = buffer;
|
||||
if( extra )
|
||||
*s++ = 0;
|
||||
|
||||
memcpy( s, tmp, n-extra );
|
||||
}
|
||||
g10_free(tmp);
|
||||
*nbytes = n;
|
||||
return 0;
|
||||
}
|
||||
else if( format == GCRYMPI_FMT_USG ) {
|
||||
unsigned int n = (nbits + 7)/8;
|
||||
|
||||
/* we ignore the sign for this format */
|
||||
/* FIXME: for performance reasons we should put this into
|
||||
* mpi_aprint becuase we can then use the buffer directly */
|
||||
if( n > len && buffer )
|
||||
return GCRYERR_TOO_SHORT; /* the provided buffer is too short */
|
||||
if( buffer ) {
|
||||
char *tmp;
|
||||
tmp = mpi_get_buffer( a, &n, NULL );
|
||||
memcpy( buffer, tmp, n );
|
||||
g10_free(tmp);
|
||||
}
|
||||
*nbytes = n;
|
||||
return 0;
|
||||
}
|
||||
else if( format == GCRYMPI_FMT_PGP ) {
|
||||
unsigned int n = (nbits + 7)/8;
|
||||
|
||||
if( a->sign )
|
||||
return GCRYERR_INV_ARG; /* pgp format can only handle unsigned */
|
||||
|
||||
if( n+2 > len && buffer )
|
||||
return GCRYERR_TOO_SHORT; /* the provided buffer is too short */
|
||||
if( buffer ) {
|
||||
char *tmp;
|
||||
byte *s = buffer;
|
||||
s[0] = nbits >> 8;
|
||||
s[1] = nbits;
|
||||
|
||||
tmp = mpi_get_buffer( a, &n, NULL );
|
||||
memcpy( s+2, tmp, n );
|
||||
g10_free(tmp);
|
||||
}
|
||||
*nbytes = n+2;
|
||||
return 0;
|
||||
}
|
||||
else if( format == GCRYMPI_FMT_SSH ) {
|
||||
char *tmp;
|
||||
int extra = 0;
|
||||
unsigned int n;
|
||||
|
||||
if( a->sign )
|
||||
return GCRYERR_INTERNAL; /* can't handle it yet */
|
||||
|
||||
tmp = mpi_get_buffer( a, &n, NULL );
|
||||
if( n && (*tmp & 0x80) ) {
|
||||
n++;
|
||||
extra=1;
|
||||
}
|
||||
|
||||
if( n+4 > len && buffer ) {
|
||||
g10_free(tmp);
|
||||
return GCRYERR_TOO_SHORT; /* the provided buffer is too short */
|
||||
}
|
||||
if( buffer ) {
|
||||
byte *s = buffer;
|
||||
*s++ = n >> 24;
|
||||
*s++ = n >> 16;
|
||||
*s++ = n >> 8;
|
||||
*s++ = n;
|
||||
if( extra )
|
||||
*s++ = 0;
|
||||
|
||||
memcpy( s, tmp, n-extra );
|
||||
}
|
||||
g10_free(tmp);
|
||||
*nbytes = 4+n;
|
||||
return 0;
|
||||
}
|
||||
else if( format == GCRYMPI_FMT_HEX ) {
|
||||
byte *tmp;
|
||||
int i;
|
||||
int extra = 0;
|
||||
unsigned int n=0;
|
||||
|
||||
tmp = mpi_get_buffer( a, &n, NULL );
|
||||
if( !n || (*tmp & 0x80) )
|
||||
extra=2;
|
||||
|
||||
if( 2*n + extra + !!a->sign + 1 > len && buffer ) {
|
||||
g10_free(tmp);
|
||||
return GCRYERR_TOO_SHORT; /* the provided buffer is too short */
|
||||
}
|
||||
if( buffer ) {
|
||||
byte *s = buffer;
|
||||
if( a->sign )
|
||||
*s++ = '-';
|
||||
if( extra ) {
|
||||
*s++ = '0';
|
||||
*s++ = '0';
|
||||
}
|
||||
|
||||
for(i=0; i < n; i++ ) {
|
||||
unsigned int c = tmp[i];
|
||||
*s++ = (c >> 4) < 10? '0'+(c>>4) : 'A'+(c>>4)-10 ;
|
||||
c &= 15;
|
||||
*s++ = c < 10? '0'+c : 'A'+c-10 ;
|
||||
}
|
||||
*s++ = 0;
|
||||
*nbytes = (char*)s - buffer;
|
||||
}
|
||||
else {
|
||||
*nbytes = 2*n + extra + !!a->sign + 1;
|
||||
}
|
||||
g10_free(tmp);
|
||||
return 0;
|
||||
}
|
||||
else
|
||||
return GCRYERR_INV_ARG;
|
||||
}
|
||||
|
||||
/****************
|
||||
* Like gcry_mpi_print but this function allocates the buffer itself.
|
||||
* The caller has to supply the address of a pointer. nbytes may be
|
||||
* NULL.
|
||||
*/
|
||||
int
|
||||
gcry_mpi_aprint( enum gcry_mpi_format format, void **buffer, size_t *nbytes,
|
||||
struct gcry_mpi *a )
|
||||
{
|
||||
size_t n;
|
||||
int rc;
|
||||
|
||||
*buffer = NULL;
|
||||
rc = gcry_mpi_print( format, NULL, &n, a );
|
||||
if( rc )
|
||||
return rc;
|
||||
*buffer = mpi_is_secure(a) ? g10_xmalloc_secure( n ) : g10_xmalloc( n );
|
||||
rc = gcry_mpi_print( format, *buffer, &n, a );
|
||||
if( rc ) {
|
||||
g10_free(*buffer);
|
||||
*buffer = NULL;
|
||||
}
|
||||
else if( nbytes )
|
||||
*nbytes = n;
|
||||
return rc;
|
||||
}
|
||||
|
||||
|
||||
Loading…
Add table
Add a link
Reference in a new issue