132 lines
4.4 KiB
C
Executable file
132 lines
4.4 KiB
C
Executable file
/* $OpenBSD: bn_mpi.c,v 1.8 2017/01/29 17:49:22 beck Exp $ */
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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#include <stdio.h>
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#include <openssl/err.h>
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#include "bn_lcl.h"
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int
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BN_bn2mpi(const BIGNUM *a, unsigned char *d)
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{
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int bits;
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int num = 0;
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int ext = 0;
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long l;
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bits = BN_num_bits(a);
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num = (bits + 7) / 8;
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if (bits > 0) {
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ext = ((bits & 0x07) == 0);
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}
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if (d == NULL)
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return (num + 4 + ext);
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l = num + ext;
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d[0] = (unsigned char)(l >> 24) & 0xff;
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d[1] = (unsigned char)(l >> 16) & 0xff;
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d[2] = (unsigned char)(l >> 8) & 0xff;
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d[3] = (unsigned char)(l) & 0xff;
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if (ext)
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d[4] = 0;
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num = BN_bn2bin(a, &(d[4 + ext]));
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if (a->neg)
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d[4] |= 0x80;
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return (num + 4 + ext);
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}
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BIGNUM *
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BN_mpi2bn(const unsigned char *d, int n, BIGNUM *a)
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{
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long len;
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int neg = 0;
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if (n < 4) {
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BNerror(BN_R_INVALID_LENGTH);
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return (NULL);
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}
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len = ((long)d[0] << 24) | ((long)d[1] << 16) | ((int)d[2] << 8) |
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(int)d[3];
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if ((len + 4) != n) {
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BNerror(BN_R_ENCODING_ERROR);
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return (NULL);
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}
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if (a == NULL)
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a = BN_new();
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if (a == NULL)
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return (NULL);
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if (len == 0) {
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a->neg = 0;
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a->top = 0;
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return (a);
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}
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d += 4;
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if ((*d) & 0x80)
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neg = 1;
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if (BN_bin2bn(d, (int)len, a) == NULL)
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return (NULL);
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a->neg = neg;
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if (neg) {
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BN_clear_bit(a, BN_num_bits(a) - 1);
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}
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bn_check_top(a);
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return (a);
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}
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