summaryrefslogtreecommitdiffstats
path: root/mpi/mpicoder.c
diff options
context:
space:
mode:
Diffstat (limited to 'mpi/mpicoder.c')
-rw-r--r--mpi/mpicoder.c447
1 files changed, 0 insertions, 447 deletions
diff --git a/mpi/mpicoder.c b/mpi/mpicoder.c
deleted file mode 100644
index 8cb1538c0..000000000
--- a/mpi/mpicoder.c
+++ /dev/null
@@ -1,447 +0,0 @@
-/* mpicoder.c - Coder for the external representation of MPIs
- * Copyright (C) 1998, 1999 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 <stdio.h>
-#include <string.h>
-#include <stdlib.h>
-#include <assert.h>
-
-#include "mpi.h"
-#include "mpi-internal.h"
-#include "iobuf.h"
-#include "memory.h"
-#include "util.h"
-
-#ifdef M_DEBUG
- #undef mpi_read
-#endif
-
-#define MAX_EXTERN_MPI_BITS 16384
-
-/****************
- * write an mpi to out.
- */
-int
-mpi_write( IOBUF out, MPI a )
-{
- int rc;
- unsigned nbits = mpi_get_nbits(a);
- byte *p, *buf;
- unsigned n;
-
- if( nbits > MAX_EXTERN_MPI_BITS )
- log_bug("mpi_encode: mpi too large (%u bits)\n", nbits);
-
- iobuf_put(out, (nbits >>8) );
- iobuf_put(out, (nbits) );
-
- p = buf = mpi_get_buffer( a, &n, NULL );
- rc = iobuf_write( out, p, n );
- m_free(buf);
- return rc;
-}
-
-
-/****************
- * Read an external representation of an mpi and return the MPI
- * The external format is a 16 bit unsigned value stored in network byte order,
- * giving the number of bits for the following integer. The integer is stored
- * with MSB first (left padded with zeroes to align on a byte boundary).
- */
-MPI
-#ifdef M_DEBUG
-mpi_debug_read(IOBUF inp, unsigned *ret_nread, int secure, const char *info)
-#else
-mpi_read(IOBUF inp, unsigned *ret_nread, int secure)
-#endif
-{
- int c, i, j;
- unsigned nbits, nbytes, nlimbs, nread=0;
- mpi_limb_t a;
- MPI val = MPI_NULL;
-
- if( (c = iobuf_get(inp)) == -1 )
- goto leave;
- nbits = c << 8;
- if( (c = iobuf_get(inp)) == -1 )
- goto leave;
- nbits |= c;
- if( nbits > MAX_EXTERN_MPI_BITS ) {
- log_error("mpi too large (%u bits)\n", nbits);
- goto leave;
- }
- nread = 2;
-
- nbytes = (nbits+7) / 8;
- nlimbs = (nbytes+BYTES_PER_MPI_LIMB-1) / BYTES_PER_MPI_LIMB;
- #ifdef M_DEBUG
- val = secure? mpi_debug_alloc_secure( nlimbs, info )
- : mpi_debug_alloc( nlimbs, info );
- #else
- val = secure? mpi_alloc_secure( nlimbs )
- : mpi_alloc( nlimbs );
- #endif
- i = BYTES_PER_MPI_LIMB - nbytes % BYTES_PER_MPI_LIMB;
- i %= BYTES_PER_MPI_LIMB;
- val->nbits = nbits;
- j= val->nlimbs = nlimbs;
- val->sign = 0;
- for( ; j > 0; j-- ) {
- a = 0;
- for(; i < BYTES_PER_MPI_LIMB; i++ ) {
- a <<= 8;
- a |= iobuf_get(inp) & 0xff; nread++;
- }
- i = 0;
- val->d[j-1] = a;
- }
-
- leave:
- if( nread > *ret_nread )
- log_bug("mpi crosses packet border\n");
- else
- *ret_nread = nread;
- return val;
-}
-
-
-MPI
-mpi_read_from_buffer(byte *buffer, unsigned *ret_nread, int secure)
-{
- int i, j;
- unsigned nbits, nbytes, nlimbs, nread=0;
- mpi_limb_t a;
- MPI val = MPI_NULL;
-
- if( *ret_nread < 2 )
- goto leave;
- nbits = buffer[0] << 8 | buffer[1];
- if( nbits > MAX_EXTERN_MPI_BITS ) {
- log_error("mpi too large (%u bits)\n", nbits);
- goto leave;
- }
- buffer += 2;
- nread = 2;
-
- nbytes = (nbits+7) / 8;
- nlimbs = (nbytes+BYTES_PER_MPI_LIMB-1) / BYTES_PER_MPI_LIMB;
- val = secure? mpi_alloc_secure( nlimbs )
- : mpi_alloc( nlimbs );
- i = BYTES_PER_MPI_LIMB - nbytes % BYTES_PER_MPI_LIMB;
- i %= BYTES_PER_MPI_LIMB;
- val->nbits = nbits;
- j= val->nlimbs = nlimbs;
- val->sign = 0;
- for( ; j > 0; j-- ) {
- a = 0;
- for(; i < BYTES_PER_MPI_LIMB; i++ ) {
- if( ++nread > *ret_nread )
- log_bug("mpi larger than buffer\n");
- a <<= 8;
- a |= *buffer++;
- }
- i = 0;
- val->d[j-1] = a;
- }
-
- leave:
- *ret_nread = nread;
- return val;
-}
-
-
-/****************
- * Make an mpi from a character string.
- */
-int
-mpi_fromstr(MPI val, const char *str)
-{
- int hexmode=0, sign=0, prepend_zero=0, i, j, c, c1, c2;
- unsigned nbits, nbytes, nlimbs;
- mpi_limb_t a;
-
- if( *str == '-' ) {
- sign = 1;
- str++;
- }
- if( *str == '0' && str[1] == 'x' )
- hexmode = 1;
- else
- return 1; /* other bases are not yet supported */
- str += 2;
-
- nbits = strlen(str)*4;
- if( nbits % 8 )
- prepend_zero = 1;
- nbytes = (nbits+7) / 8;
- nlimbs = (nbytes+BYTES_PER_MPI_LIMB-1) / BYTES_PER_MPI_LIMB;
- if( val->alloced < nlimbs )
- mpi_resize(val, nlimbs );
- i = BYTES_PER_MPI_LIMB - nbytes % BYTES_PER_MPI_LIMB;
- i %= BYTES_PER_MPI_LIMB;
- j= val->nlimbs = nlimbs;
- val->sign = sign;
- for( ; j > 0; j-- ) {
- a = 0;
- for(; i < BYTES_PER_MPI_LIMB; i++ ) {
- if( prepend_zero ) {
- c1 = '0';
- prepend_zero = 0;
- }
- else
- c1 = *str++;
- assert(c1);
- c2 = *str++;
- assert(c2);
- if( c1 >= '0' && c1 <= '9' )
- c = c1 - '0';
- else if( c1 >= 'a' && c1 <= 'f' )
- c = c1 - 'a' + 10;
- else if( c1 >= 'A' && c1 <= 'F' )
- c = c1 - 'A' + 10;
- else {
- mpi_clear(val);
- return 1;
- }
- c <<= 4;
- if( c2 >= '0' && c2 <= '9' )
- c |= c2 - '0';
- else if( c2 >= 'a' && c2 <= 'f' )
- c |= c2 - 'a' + 10;
- else if( c2 >= 'A' && c2 <= 'F' )
- c |= c2 - 'A' + 10;
- else {
- mpi_clear(val);
- return 1;
- }
- a <<= 8;
- a |= c;
- }
- i = 0;
- val->d[j-1] = a;
- }
-
- return 0;
-}
-
-
-/****************
- * print an MPI to the given stream and return the number of characters
- * printed.
- */
-int
-mpi_print( FILE *fp, MPI a, int mode )
-{
- int i, n=0;
-
- if( a == MPI_NULL )
- return fprintf(fp, "[MPI_NULL]");
- if( !mode ) {
- unsigned int n1;
-
- n1 = mpi_get_nbits(a);
- n += fprintf(fp, "[%u bits]", n1);
- }
- else {
- if( a->sign )
- putc('-', fp);
-#if BYTES_PER_MPI_LIMB == 2
-#define X "4"
-#elif BYTES_PER_MPI_LIMB == 4
-#define X "8"
-#elif BYTES_PER_MPI_LIMB == 8
-#define X "16"
-#else
-#error please define the format here
-#endif
- for(i=a->nlimbs; i > 0 ; i-- ) {
- n += fprintf(fp, i!=a->nlimbs? "%0" X "lX":"%lX", (ulong)a->d[i-1]);
-#undef X
- }
- if( !a->nlimbs )
- putc('0', fp );
- }
- return n;
-}
-
-
-void
-g10_log_mpidump( const char *text, MPI a )
-{
- FILE *fp = log_stream();
-
- g10_log_print_prefix(text);
- mpi_print(fp, a, 1 );
- fputc('\n', fp);
-}
-
-/****************
- * Special function to get the low 8 bytes from an mpi.
- * This can be used as a keyid; KEYID is an 2 element array.
- * Return the low 4 bytes.
- */
-u32
-mpi_get_keyid( MPI a, u32 *keyid )
-{
-#if BYTES_PER_MPI_LIMB == 4
- if( keyid ) {
- keyid[0] = a->nlimbs >= 2? a->d[1] : 0;
- keyid[1] = a->nlimbs >= 1? a->d[0] : 0;
- }
- return a->nlimbs >= 1? a->d[0] : 0;
-#elif BYTES_PER_MPI_LIMB == 8
- if( keyid ) {
- keyid[0] = a->nlimbs? (u32)(a->d[0] >> 32) : 0;
- keyid[1] = a->nlimbs? (u32)(a->d[0] & 0xffffffff) : 0;
- }
- return a->nlimbs? (u32)(a->d[0] & 0xffffffff) : 0;
-#else
- #error Make this function work with other LIMB sizes
-#endif
-}
-
-
-/****************
- * Return an m_alloced buffer with the MPI (msb first).
- * NBYTES receives the length of this buffer. Caller must free the
- * return string (This function does return a 0 byte buffer with NBYTES
- * set to zero if the value of A is zero. If sign is not NULL, it will
- * be set to the sign of the A.
- */
-static byte *
-do_get_buffer( MPI a, unsigned *nbytes, int *sign, int force_secure )
-{
- byte *p, *buffer;
- mpi_limb_t alimb;
- int i;
- unsigned int n;
-
- if( sign )
- *sign = a->sign;
- *nbytes = n = a->nlimbs * BYTES_PER_MPI_LIMB;
- if (!n)
- n++; /* avoid zero length allocation */
- p = buffer = force_secure || mpi_is_secure(a) ? m_alloc_secure(n)
- : m_alloc(n);
-
- for(i=a->nlimbs-1; i >= 0; i-- ) {
- alimb = a->d[i];
-#if BYTES_PER_MPI_LIMB == 4
- *p++ = alimb >> 24;
- *p++ = alimb >> 16;
- *p++ = alimb >> 8;
- *p++ = alimb ;
-#elif BYTES_PER_MPI_LIMB == 8
- *p++ = alimb >> 56;
- *p++ = alimb >> 48;
- *p++ = alimb >> 40;
- *p++ = alimb >> 32;
- *p++ = alimb >> 24;
- *p++ = alimb >> 16;
- *p++ = alimb >> 8;
- *p++ = alimb ;
-#else
-#error please implement for this limb size.
-#endif
- }
-
- /* this is sub-optimal but we need to do the shift operation
- * because the caller has to free the returned buffer */
- for(p=buffer; !*p && *nbytes; p++, --*nbytes )
- ;
- if( p != buffer )
- memmove(buffer,p, *nbytes);
-
- return buffer;
-}
-
-
-byte *
-mpi_get_buffer( MPI a, unsigned *nbytes, int *sign )
-{
- return do_get_buffer( a, nbytes, sign, 0 );
-}
-
-byte *
-mpi_get_secure_buffer( MPI a, unsigned *nbytes, int *sign )
-{
- return do_get_buffer( a, nbytes, sign, 1 );
-}
-
-/****************
- * Use BUFFER to update MPI.
- */
-void
-mpi_set_buffer( MPI a, const byte *buffer, unsigned nbytes, int sign )
-{
- const byte *p;
- mpi_limb_t alimb;
- int nlimbs;
- int i;
-
- nlimbs = (nbytes + BYTES_PER_MPI_LIMB - 1) / BYTES_PER_MPI_LIMB;
- RESIZE_IF_NEEDED(a, nlimbs);
- a->sign = sign;
-
- for(i=0, p = buffer+nbytes-1; p >= buffer+BYTES_PER_MPI_LIMB; ) {
- #if BYTES_PER_MPI_LIMB == 4
- alimb = (mpi_limb_t)*p-- ;
- alimb |= (mpi_limb_t)*p-- << 8 ;
- alimb |= (mpi_limb_t)*p-- << 16 ;
- alimb |= (mpi_limb_t)*p-- << 24 ;
- #elif BYTES_PER_MPI_LIMB == 8
- alimb = (mpi_limb_t)*p-- ;
- alimb |= (mpi_limb_t)*p-- << 8 ;
- alimb |= (mpi_limb_t)*p-- << 16 ;
- alimb |= (mpi_limb_t)*p-- << 24 ;
- alimb |= (mpi_limb_t)*p-- << 32 ;
- alimb |= (mpi_limb_t)*p-- << 40 ;
- alimb |= (mpi_limb_t)*p-- << 48 ;
- alimb |= (mpi_limb_t)*p-- << 56 ;
- #else
- #error please implement for this limb size.
- #endif
- a->d[i++] = alimb;
- }
- if( p >= buffer ) {
- #if BYTES_PER_MPI_LIMB == 4
- alimb = *p-- ;
- if( p >= buffer ) alimb |= (mpi_limb_t)*p-- << 8 ;
- if( p >= buffer ) alimb |= (mpi_limb_t)*p-- << 16 ;
- if( p >= buffer ) alimb |= (mpi_limb_t)*p-- << 24 ;
- #elif BYTES_PER_MPI_LIMB == 8
- alimb = (mpi_limb_t)*p-- ;
- if( p >= buffer ) alimb |= (mpi_limb_t)*p-- << 8 ;
- if( p >= buffer ) alimb |= (mpi_limb_t)*p-- << 16 ;
- if( p >= buffer ) alimb |= (mpi_limb_t)*p-- << 24 ;
- if( p >= buffer ) alimb |= (mpi_limb_t)*p-- << 32 ;
- 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 );
-}
-
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-02 03:33:20 +0100