-/* crypto/bn/bn_mpi.c */
-/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
- * All rights reserved.
+/*
+ * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
*
- * This package is an SSL implementation written
- * by Eric Young (eay@cryptsoft.com).
- * The implementation was written so as to conform with Netscapes SSL.
- *
- * This library is free for commercial and non-commercial use as long as
- * the following conditions are aheared to. The following conditions
- * apply to all code found in this distribution, be it the RC4, RSA,
- * lhash, DES, etc., code; not just the SSL code. The SSL documentation
- * included with this distribution is covered by the same copyright terms
- * except that the holder is Tim Hudson (tjh@cryptsoft.com).
- *
- * Copyright remains Eric Young's, and as such any Copyright notices in
- * the code are not to be removed.
- * If this package is used in a product, Eric Young should be given attribution
- * as the author of the parts of the library used.
- * This can be in the form of a textual message at program startup or
- * in documentation (online or textual) provided with the package.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * "This product includes cryptographic software written by
- * Eric Young (eay@cryptsoft.com)"
- * The word 'cryptographic' can be left out if the rouines from the library
- * being used are not cryptographic related :-).
- * 4. If you include any Windows specific code (or a derivative thereof) from
- * the apps directory (application code) you must include an acknowledgement:
- * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
- *
- * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * The licence and distribution terms for any publically available version or
- * derivative of this code cannot be changed. i.e. this code cannot simply be
- * copied and put under another distribution licence
- * [including the GNU Public Licence.]
+ * Licensed under the Apache License 2.0 (the "License"). You may not use
+ * this file except in compliance with the License. You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
*/
#include <stdio.h>
-#include "cryptlib.h"
-#include "bn_lcl.h"
+#include "internal/cryptlib.h"
+#include "bn_local.h"
-int BN_bn2mpi(a,d)
-BIGNUM *a;
-unsigned char *d;
- {
- int bits;
- int num=0;
- int ext=0;
- long l;
+int BN_bn2mpi(const BIGNUM *a, unsigned char *d)
+{
+ int bits;
+ int num = 0;
+ int ext = 0;
+ long l;
- bits=BN_num_bits(a);
- num=(bits+7)/8;
- if (bits > 0)
- {
- ext=((bits & 0x07) == 0);
- }
- if (d == NULL)
- return(num+4+ext);
+ bits = BN_num_bits(a);
+ num = (bits + 7) / 8;
+ if (bits > 0) {
+ ext = ((bits & 0x07) == 0);
+ }
+ if (d == NULL)
+ return (num + 4 + ext);
- l=num+ext;
- d[0]=(unsigned char)(l>>24)&0xff;
- d[1]=(unsigned char)(l>>16)&0xff;
- d[2]=(unsigned char)(l>> 8)&0xff;
- d[3]=(unsigned char)(l )&0xff;
- if (ext) d[4]=0;
- num=BN_bn2bin(a,&(d[4+ext]));
- if (a->neg)
- d[4]|=0x80;
- return(num+4+ext);
- }
+ l = num + ext;
+ d[0] = (unsigned char)(l >> 24) & 0xff;
+ d[1] = (unsigned char)(l >> 16) & 0xff;
+ d[2] = (unsigned char)(l >> 8) & 0xff;
+ d[3] = (unsigned char)(l) & 0xff;
+ if (ext)
+ d[4] = 0;
+ num = BN_bn2bin(a, &(d[4 + ext]));
+ if (a->neg)
+ d[4] |= 0x80;
+ return (num + 4 + ext);
+}
-BIGNUM *BN_mpi2bn(d,n,a)
-unsigned char *d;
-int n;
-BIGNUM *a;
- {
- long len;
- int neg=0;
+BIGNUM *BN_mpi2bn(const unsigned char *d, int n, BIGNUM *ain)
+{
+ long len;
+ int neg = 0;
+ BIGNUM *a = NULL;
- if (n < 4)
- {
- BNerr(BN_F_BN_MPI2BN,BN_R_INVALID_LENGTH);
- return(NULL);
- }
- len=((long)d[0]<<24)|((long)d[1]<<16)|((int)d[2]<<8)|(int)d[3];
- if ((len+4) != n)
- {
- BNerr(BN_F_BN_MPI2BN,BN_R_ENCODING_ERROR);
- return(NULL);
- }
+ if (n < 4 || (d[0] & 0x80) != 0) {
+ BNerr(BN_F_BN_MPI2BN, BN_R_INVALID_LENGTH);
+ return NULL;
+ }
+ len = ((long)d[0] << 24) | ((long)d[1] << 16) | ((int)d[2] << 8) | (int)
+ d[3];
+ if ((len + 4) != n) {
+ BNerr(BN_F_BN_MPI2BN, BN_R_ENCODING_ERROR);
+ return NULL;
+ }
- if (a == NULL) a=BN_new();
- if (a == NULL) return(NULL);
+ if (ain == NULL)
+ a = BN_new();
+ else
+ a = ain;
- if (len == 0)
- {
- a->neg=0;
- a->top=0;
- return(a);
- }
- d+=4;
- if ((*d) & 0x80)
- neg=1;
- if (BN_bin2bn(d,(int)len,a) == NULL)
- return(NULL);
- a->neg=neg;
- if (neg)
- {
- BN_clear_bit(a,BN_num_bits(a)-1);
- }
- return(a);
- }
+ if (a == NULL)
+ return NULL;
+ if (len == 0) {
+ a->neg = 0;
+ a->top = 0;
+ return a;
+ }
+ d += 4;
+ if ((*d) & 0x80)
+ neg = 1;
+ if (BN_bin2bn(d, (int)len, a) == NULL) {
+ if (ain == NULL)
+ BN_free(a);
+ return NULL;
+ }
+ a->neg = neg;
+ if (neg) {
+ BN_clear_bit(a, BN_num_bits(a) - 1);
+ }
+ bn_check_top(a);
+ return a;
+}
projects / openssl.git / blobdiff