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1035 lines
27 KiB
1035 lines
27 KiB
14 years ago
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/* crypto/bn/bn_gf2m.c */
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/* ====================================================================
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* Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
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*
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* The Elliptic Curve Public-Key Crypto Library (ECC Code) included
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* herein is developed by SUN MICROSYSTEMS, INC., and is contributed
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* to the OpenSSL project.
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*
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* The ECC Code is licensed pursuant to the OpenSSL open source
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* license provided below.
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*
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* In addition, Sun covenants to all licensees who provide a reciprocal
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* covenant with respect to their own patents if any, not to sue under
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* current and future patent claims necessarily infringed by the making,
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* using, practicing, selling, offering for sale and/or otherwise
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* disposing of the ECC Code as delivered hereunder (or portions thereof),
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* provided that such covenant shall not apply:
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* 1) for code that a licensee deletes from the ECC Code;
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* 2) separates from the ECC Code; or
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* 3) for infringements caused by:
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* i) the modification of the ECC Code or
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* ii) the combination of the ECC Code with other software or
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* devices where such combination causes the infringement.
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*
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* The software is originally written by Sheueling Chang Shantz and
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* Douglas Stebila of Sun Microsystems Laboratories.
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*
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*/
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/* NOTE: This file is licensed pursuant to the OpenSSL license below
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* and may be modified; but after modifications, the above covenant
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* may no longer apply! In such cases, the corresponding paragraph
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* ["In addition, Sun covenants ... causes the infringement."] and
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* this note can be edited out; but please keep the Sun copyright
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* notice and attribution. */
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/* ====================================================================
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* Copyright (c) 1998-2002 The OpenSSL Project. All rights reserved.
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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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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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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
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* openssl-core@openssl.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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*
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*/
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#include <assert.h>
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#include <limits.h>
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#include <stdio.h>
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#include "cryptlib.h"
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#include "bn_lcl.h"
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/* Maximum number of iterations before BN_GF2m_mod_solve_quad_arr should fail. */
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#define MAX_ITERATIONS 50
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static const BN_ULONG SQR_tb[16] =
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{ 0, 1, 4, 5, 16, 17, 20, 21,
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64, 65, 68, 69, 80, 81, 84, 85 };
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/* Platform-specific macros to accelerate squaring. */
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#if defined(SIXTY_FOUR_BIT) || defined(SIXTY_FOUR_BIT_LONG)
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#define SQR1(w) \
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SQR_tb[(w) >> 60 & 0xF] << 56 | SQR_tb[(w) >> 56 & 0xF] << 48 | \
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SQR_tb[(w) >> 52 & 0xF] << 40 | SQR_tb[(w) >> 48 & 0xF] << 32 | \
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SQR_tb[(w) >> 44 & 0xF] << 24 | SQR_tb[(w) >> 40 & 0xF] << 16 | \
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SQR_tb[(w) >> 36 & 0xF] << 8 | SQR_tb[(w) >> 32 & 0xF]
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#define SQR0(w) \
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SQR_tb[(w) >> 28 & 0xF] << 56 | SQR_tb[(w) >> 24 & 0xF] << 48 | \
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SQR_tb[(w) >> 20 & 0xF] << 40 | SQR_tb[(w) >> 16 & 0xF] << 32 | \
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SQR_tb[(w) >> 12 & 0xF] << 24 | SQR_tb[(w) >> 8 & 0xF] << 16 | \
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SQR_tb[(w) >> 4 & 0xF] << 8 | SQR_tb[(w) & 0xF]
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#endif
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#ifdef THIRTY_TWO_BIT
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#define SQR1(w) \
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SQR_tb[(w) >> 28 & 0xF] << 24 | SQR_tb[(w) >> 24 & 0xF] << 16 | \
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SQR_tb[(w) >> 20 & 0xF] << 8 | SQR_tb[(w) >> 16 & 0xF]
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#define SQR0(w) \
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SQR_tb[(w) >> 12 & 0xF] << 24 | SQR_tb[(w) >> 8 & 0xF] << 16 | \
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SQR_tb[(w) >> 4 & 0xF] << 8 | SQR_tb[(w) & 0xF]
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#endif
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/* Product of two polynomials a, b each with degree < BN_BITS2 - 1,
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* result is a polynomial r with degree < 2 * BN_BITS - 1
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* The caller MUST ensure that the variables have the right amount
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* of space allocated.
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*/
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#ifdef THIRTY_TWO_BIT
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static void bn_GF2m_mul_1x1(BN_ULONG *r1, BN_ULONG *r0, const BN_ULONG a, const BN_ULONG b)
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{
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register BN_ULONG h, l, s;
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BN_ULONG tab[8], top2b = a >> 30;
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register BN_ULONG a1, a2, a4;
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a1 = a & (0x3FFFFFFF); a2 = a1 << 1; a4 = a2 << 1;
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tab[0] = 0; tab[1] = a1; tab[2] = a2; tab[3] = a1^a2;
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tab[4] = a4; tab[5] = a1^a4; tab[6] = a2^a4; tab[7] = a1^a2^a4;
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s = tab[b & 0x7]; l = s;
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s = tab[b >> 3 & 0x7]; l ^= s << 3; h = s >> 29;
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s = tab[b >> 6 & 0x7]; l ^= s << 6; h ^= s >> 26;
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s = tab[b >> 9 & 0x7]; l ^= s << 9; h ^= s >> 23;
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s = tab[b >> 12 & 0x7]; l ^= s << 12; h ^= s >> 20;
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s = tab[b >> 15 & 0x7]; l ^= s << 15; h ^= s >> 17;
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s = tab[b >> 18 & 0x7]; l ^= s << 18; h ^= s >> 14;
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s = tab[b >> 21 & 0x7]; l ^= s << 21; h ^= s >> 11;
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s = tab[b >> 24 & 0x7]; l ^= s << 24; h ^= s >> 8;
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s = tab[b >> 27 & 0x7]; l ^= s << 27; h ^= s >> 5;
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s = tab[b >> 30 ]; l ^= s << 30; h ^= s >> 2;
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/* compensate for the top two bits of a */
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if (top2b & 01) { l ^= b << 30; h ^= b >> 2; }
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if (top2b & 02) { l ^= b << 31; h ^= b >> 1; }
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*r1 = h; *r0 = l;
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}
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#endif
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#if defined(SIXTY_FOUR_BIT) || defined(SIXTY_FOUR_BIT_LONG)
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static void bn_GF2m_mul_1x1(BN_ULONG *r1, BN_ULONG *r0, const BN_ULONG a, const BN_ULONG b)
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{
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register BN_ULONG h, l, s;
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BN_ULONG tab[16], top3b = a >> 61;
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register BN_ULONG a1, a2, a4, a8;
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a1 = a & (0x1FFFFFFFFFFFFFFFULL); a2 = a1 << 1; a4 = a2 << 1; a8 = a4 << 1;
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tab[ 0] = 0; tab[ 1] = a1; tab[ 2] = a2; tab[ 3] = a1^a2;
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tab[ 4] = a4; tab[ 5] = a1^a4; tab[ 6] = a2^a4; tab[ 7] = a1^a2^a4;
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tab[ 8] = a8; tab[ 9] = a1^a8; tab[10] = a2^a8; tab[11] = a1^a2^a8;
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tab[12] = a4^a8; tab[13] = a1^a4^a8; tab[14] = a2^a4^a8; tab[15] = a1^a2^a4^a8;
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s = tab[b & 0xF]; l = s;
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s = tab[b >> 4 & 0xF]; l ^= s << 4; h = s >> 60;
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s = tab[b >> 8 & 0xF]; l ^= s << 8; h ^= s >> 56;
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s = tab[b >> 12 & 0xF]; l ^= s << 12; h ^= s >> 52;
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s = tab[b >> 16 & 0xF]; l ^= s << 16; h ^= s >> 48;
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s = tab[b >> 20 & 0xF]; l ^= s << 20; h ^= s >> 44;
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s = tab[b >> 24 & 0xF]; l ^= s << 24; h ^= s >> 40;
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s = tab[b >> 28 & 0xF]; l ^= s << 28; h ^= s >> 36;
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s = tab[b >> 32 & 0xF]; l ^= s << 32; h ^= s >> 32;
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s = tab[b >> 36 & 0xF]; l ^= s << 36; h ^= s >> 28;
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s = tab[b >> 40 & 0xF]; l ^= s << 40; h ^= s >> 24;
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s = tab[b >> 44 & 0xF]; l ^= s << 44; h ^= s >> 20;
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s = tab[b >> 48 & 0xF]; l ^= s << 48; h ^= s >> 16;
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s = tab[b >> 52 & 0xF]; l ^= s << 52; h ^= s >> 12;
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s = tab[b >> 56 & 0xF]; l ^= s << 56; h ^= s >> 8;
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s = tab[b >> 60 ]; l ^= s << 60; h ^= s >> 4;
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/* compensate for the top three bits of a */
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if (top3b & 01) { l ^= b << 61; h ^= b >> 3; }
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if (top3b & 02) { l ^= b << 62; h ^= b >> 2; }
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if (top3b & 04) { l ^= b << 63; h ^= b >> 1; }
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*r1 = h; *r0 = l;
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}
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#endif
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/* Product of two polynomials a, b each with degree < 2 * BN_BITS2 - 1,
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* result is a polynomial r with degree < 4 * BN_BITS2 - 1
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* The caller MUST ensure that the variables have the right amount
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* of space allocated.
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*/
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static void bn_GF2m_mul_2x2(BN_ULONG *r, const BN_ULONG a1, const BN_ULONG a0, const BN_ULONG b1, const BN_ULONG b0)
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{
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BN_ULONG m1, m0;
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/* r[3] = h1, r[2] = h0; r[1] = l1; r[0] = l0 */
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bn_GF2m_mul_1x1(r+3, r+2, a1, b1);
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bn_GF2m_mul_1x1(r+1, r, a0, b0);
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bn_GF2m_mul_1x1(&m1, &m0, a0 ^ a1, b0 ^ b1);
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/* Correction on m1 ^= l1 ^ h1; m0 ^= l0 ^ h0; */
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r[2] ^= m1 ^ r[1] ^ r[3]; /* h0 ^= m1 ^ l1 ^ h1; */
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r[1] = r[3] ^ r[2] ^ r[0] ^ m1 ^ m0; /* l1 ^= l0 ^ h0 ^ m0; */
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}
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/* Add polynomials a and b and store result in r; r could be a or b, a and b
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* could be equal; r is the bitwise XOR of a and b.
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*/
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int BN_GF2m_add(BIGNUM *r, const BIGNUM *a, const BIGNUM *b)
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{
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int i;
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const BIGNUM *at, *bt;
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bn_check_top(a);
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bn_check_top(b);
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if (a->top < b->top) { at = b; bt = a; }
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else { at = a; bt = b; }
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if(bn_wexpand(r, at->top) == NULL)
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return 0;
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for (i = 0; i < bt->top; i++)
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{
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r->d[i] = at->d[i] ^ bt->d[i];
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}
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for (; i < at->top; i++)
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{
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r->d[i] = at->d[i];
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}
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r->top = at->top;
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bn_correct_top(r);
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return 1;
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}
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/* Some functions allow for representation of the irreducible polynomials
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* as an int[], say p. The irreducible f(t) is then of the form:
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* t^p[0] + t^p[1] + ... + t^p[k]
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* where m = p[0] > p[1] > ... > p[k] = 0.
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*/
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/* Performs modular reduction of a and store result in r. r could be a. */
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int BN_GF2m_mod_arr(BIGNUM *r, const BIGNUM *a, const int p[])
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{
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int j, k;
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int n, dN, d0, d1;
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BN_ULONG zz, *z;
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bn_check_top(a);
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if (!p[0])
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{
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/* reduction mod 1 => return 0 */
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BN_zero(r);
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return 1;
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}
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/* Since the algorithm does reduction in the r value, if a != r, copy
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* the contents of a into r so we can do reduction in r.
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*/
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if (a != r)
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{
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if (!bn_wexpand(r, a->top)) return 0;
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for (j = 0; j < a->top; j++)
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{
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r->d[j] = a->d[j];
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}
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r->top = a->top;
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}
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z = r->d;
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/* start reduction */
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dN = p[0] / BN_BITS2;
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for (j = r->top - 1; j > dN;)
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{
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zz = z[j];
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if (z[j] == 0) { j--; continue; }
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z[j] = 0;
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for (k = 1; p[k] != 0; k++)
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{
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/* reducing component t^p[k] */
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n = p[0] - p[k];
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d0 = n % BN_BITS2; d1 = BN_BITS2 - d0;
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n /= BN_BITS2;
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||
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z[j-n] ^= (zz>>d0);
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||
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if (d0) z[j-n-1] ^= (zz<<d1);
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||
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}
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|
||
|
|
/* reducing component t^0 */
|
||
|
|
n = dN;
|
||
|
|
d0 = p[0] % BN_BITS2;
|
||
|
|
d1 = BN_BITS2 - d0;
|
||
|
|
z[j-n] ^= (zz >> d0);
|
||
|
|
if (d0) z[j-n-1] ^= (zz << d1);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* final round of reduction */
|
||
|
|
while (j == dN)
|
||
|
|
{
|
||
|
|
|
||
|
|
d0 = p[0] % BN_BITS2;
|
||
|
|
zz = z[dN] >> d0;
|
||
|
|
if (zz == 0) break;
|
||
|
|
d1 = BN_BITS2 - d0;
|
||
|
|
|
||
|
|
/* clear up the top d1 bits */
|
||
|
|
if (d0)
|
||
|
|
z[dN] = (z[dN] << d1) >> d1;
|
||
|
|
else
|
||
|
|
z[dN] = 0;
|
||
|
|
z[0] ^= zz; /* reduction t^0 component */
|
||
|
|
|
||
|
|
for (k = 1; p[k] != 0; k++)
|
||
|
|
{
|
||
|
|
BN_ULONG tmp_ulong;
|
||
|
|
|
||
|
|
/* reducing component t^p[k]*/
|
||
|
|
n = p[k] / BN_BITS2;
|
||
|
|
d0 = p[k] % BN_BITS2;
|
||
|
|
d1 = BN_BITS2 - d0;
|
||
|
|
z[n] ^= (zz << d0);
|
||
|
|
tmp_ulong = zz >> d1;
|
||
|
|
if (d0 && tmp_ulong)
|
||
|
|
z[n+1] ^= tmp_ulong;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
bn_correct_top(r);
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Performs modular reduction of a by p and store result in r. r could be a.
|
||
|
|
*
|
||
|
|
* This function calls down to the BN_GF2m_mod_arr implementation; this wrapper
|
||
|
|
* function is only provided for convenience; for best performance, use the
|
||
|
|
* BN_GF2m_mod_arr function.
|
||
|
|
*/
|
||
|
|
int BN_GF2m_mod(BIGNUM *r, const BIGNUM *a, const BIGNUM *p)
|
||
|
|
{
|
||
|
|
int ret = 0;
|
||
|
|
const int max = BN_num_bits(p) + 1;
|
||
|
|
int *arr=NULL;
|
||
|
|
bn_check_top(a);
|
||
|
|
bn_check_top(p);
|
||
|
|
if ((arr = (int *)OPENSSL_malloc(sizeof(int) * max)) == NULL) goto err;
|
||
|
|
ret = BN_GF2m_poly2arr(p, arr, max);
|
||
|
|
if (!ret || ret > max)
|
||
|
|
{
|
||
|
|
BNerr(BN_F_BN_GF2M_MOD,BN_R_INVALID_LENGTH);
|
||
|
|
goto err;
|
||
|
|
}
|
||
|
|
ret = BN_GF2m_mod_arr(r, a, arr);
|
||
|
|
bn_check_top(r);
|
||
|
|
err:
|
||
|
|
if (arr) OPENSSL_free(arr);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/* Compute the product of two polynomials a and b, reduce modulo p, and store
|
||
|
|
* the result in r. r could be a or b; a could be b.
|
||
|
|
*/
|
||
|
|
int BN_GF2m_mod_mul_arr(BIGNUM *r, const BIGNUM *a, const BIGNUM *b, const int p[], BN_CTX *ctx)
|
||
|
|
{
|
||
|
|
int zlen, i, j, k, ret = 0;
|
||
|
|
BIGNUM *s;
|
||
|
|
BN_ULONG x1, x0, y1, y0, zz[4];
|
||
|
|
|
||
|
|
bn_check_top(a);
|
||
|
|
bn_check_top(b);
|
||
|
|
|
||
|
|
if (a == b)
|
||
|
|
{
|
||
|
|
return BN_GF2m_mod_sqr_arr(r, a, p, ctx);
|
||
|
|
}
|
||
|
|
|
||
|
|
BN_CTX_start(ctx);
|
||
|
|
if ((s = BN_CTX_get(ctx)) == NULL) goto err;
|
||
|
|
|
||
|
|
zlen = a->top + b->top + 4;
|
||
|
|
if (!bn_wexpand(s, zlen)) goto err;
|
||
|
|
s->top = zlen;
|
||
|
|
|
||
|
|
for (i = 0; i < zlen; i++) s->d[i] = 0;
|
||
|
|
|
||
|
|
for (j = 0; j < b->top; j += 2)
|
||
|
|
{
|
||
|
|
y0 = b->d[j];
|
||
|
|
y1 = ((j+1) == b->top) ? 0 : b->d[j+1];
|
||
|
|
for (i = 0; i < a->top; i += 2)
|
||
|
|
{
|
||
|
|
x0 = a->d[i];
|
||
|
|
x1 = ((i+1) == a->top) ? 0 : a->d[i+1];
|
||
|
|
bn_GF2m_mul_2x2(zz, x1, x0, y1, y0);
|
||
|
|
for (k = 0; k < 4; k++) s->d[i+j+k] ^= zz[k];
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
bn_correct_top(s);
|
||
|
|
if (BN_GF2m_mod_arr(r, s, p))
|
||
|
|
ret = 1;
|
||
|
|
bn_check_top(r);
|
||
|
|
|
||
|
|
err:
|
||
|
|
BN_CTX_end(ctx);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Compute the product of two polynomials a and b, reduce modulo p, and store
|
||
|
|
* the result in r. r could be a or b; a could equal b.
|
||
|
|
*
|
||
|
|
* This function calls down to the BN_GF2m_mod_mul_arr implementation; this wrapper
|
||
|
|
* function is only provided for convenience; for best performance, use the
|
||
|
|
* BN_GF2m_mod_mul_arr function.
|
||
|
|
*/
|
||
|
|
int BN_GF2m_mod_mul(BIGNUM *r, const BIGNUM *a, const BIGNUM *b, const BIGNUM *p, BN_CTX *ctx)
|
||
|
|
{
|
||
|
|
int ret = 0;
|
||
|
|
const int max = BN_num_bits(p) + 1;
|
||
|
|
int *arr=NULL;
|
||
|
|
bn_check_top(a);
|
||
|
|
bn_check_top(b);
|
||
|
|
bn_check_top(p);
|
||
|
|
if ((arr = (int *)OPENSSL_malloc(sizeof(int) * max)) == NULL) goto err;
|
||
|
|
ret = BN_GF2m_poly2arr(p, arr, max);
|
||
|
|
if (!ret || ret > max)
|
||
|
|
{
|
||
|
|
BNerr(BN_F_BN_GF2M_MOD_MUL,BN_R_INVALID_LENGTH);
|
||
|
|
goto err;
|
||
|
|
}
|
||
|
|
ret = BN_GF2m_mod_mul_arr(r, a, b, arr, ctx);
|
||
|
|
bn_check_top(r);
|
||
|
|
err:
|
||
|
|
if (arr) OPENSSL_free(arr);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/* Square a, reduce the result mod p, and store it in a. r could be a. */
|
||
|
|
int BN_GF2m_mod_sqr_arr(BIGNUM *r, const BIGNUM *a, const int p[], BN_CTX *ctx)
|
||
|
|
{
|
||
|
|
int i, ret = 0;
|
||
|
|
BIGNUM *s;
|
||
|
|
|
||
|
|
bn_check_top(a);
|
||
|
|
BN_CTX_start(ctx);
|
||
|
|
if ((s = BN_CTX_get(ctx)) == NULL) return 0;
|
||
|
|
if (!bn_wexpand(s, 2 * a->top)) goto err;
|
||
|
|
|
||
|
|
for (i = a->top - 1; i >= 0; i--)
|
||
|
|
{
|
||
|
|
s->d[2*i+1] = SQR1(a->d[i]);
|
||
|
|
s->d[2*i ] = SQR0(a->d[i]);
|
||
|
|
}
|
||
|
|
|
||
|
|
s->top = 2 * a->top;
|
||
|
|
bn_correct_top(s);
|
||
|
|
if (!BN_GF2m_mod_arr(r, s, p)) goto err;
|
||
|
|
bn_check_top(r);
|
||
|
|
ret = 1;
|
||
|
|
err:
|
||
|
|
BN_CTX_end(ctx);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Square a, reduce the result mod p, and store it in a. r could be a.
|
||
|
|
*
|
||
|
|
* This function calls down to the BN_GF2m_mod_sqr_arr implementation; this wrapper
|
||
|
|
* function is only provided for convenience; for best performance, use the
|
||
|
|
* BN_GF2m_mod_sqr_arr function.
|
||
|
|
*/
|
||
|
|
int BN_GF2m_mod_sqr(BIGNUM *r, const BIGNUM *a, const BIGNUM *p, BN_CTX *ctx)
|
||
|
|
{
|
||
|
|
int ret = 0;
|
||
|
|
const int max = BN_num_bits(p) + 1;
|
||
|
|
int *arr=NULL;
|
||
|
|
|
||
|
|
bn_check_top(a);
|
||
|
|
bn_check_top(p);
|
||
|
|
if ((arr = (int *)OPENSSL_malloc(sizeof(int) * max)) == NULL) goto err;
|
||
|
|
ret = BN_GF2m_poly2arr(p, arr, max);
|
||
|
|
if (!ret || ret > max)
|
||
|
|
{
|
||
|
|
BNerr(BN_F_BN_GF2M_MOD_SQR,BN_R_INVALID_LENGTH);
|
||
|
|
goto err;
|
||
|
|
}
|
||
|
|
ret = BN_GF2m_mod_sqr_arr(r, a, arr, ctx);
|
||
|
|
bn_check_top(r);
|
||
|
|
err:
|
||
|
|
if (arr) OPENSSL_free(arr);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/* Invert a, reduce modulo p, and store the result in r. r could be a.
|
||
|
|
* Uses Modified Almost Inverse Algorithm (Algorithm 10) from
|
||
|
|
* Hankerson, D., Hernandez, J.L., and Menezes, A. "Software Implementation
|
||
|
|
* of Elliptic Curve Cryptography Over Binary Fields".
|
||
|
|
*/
|
||
|
|
int BN_GF2m_mod_inv(BIGNUM *r, const BIGNUM *a, const BIGNUM *p, BN_CTX *ctx)
|
||
|
|
{
|
||
|
|
BIGNUM *b, *c, *u, *v, *tmp;
|
||
|
|
int ret = 0;
|
||
|
|
|
||
|
|
bn_check_top(a);
|
||
|
|
bn_check_top(p);
|
||
|
|
|
||
|
|
BN_CTX_start(ctx);
|
||
|
|
|
||
|
|
b = BN_CTX_get(ctx);
|
||
|
|
c = BN_CTX_get(ctx);
|
||
|
|
u = BN_CTX_get(ctx);
|
||
|
|
v = BN_CTX_get(ctx);
|
||
|
|
if (v == NULL) goto err;
|
||
|
|
|
||
|
|
if (!BN_one(b)) goto err;
|
||
|
|
if (!BN_GF2m_mod(u, a, p)) goto err;
|
||
|
|
if (!BN_copy(v, p)) goto err;
|
||
|
|
|
||
|
|
if (BN_is_zero(u)) goto err;
|
||
|
|
|
||
|
|
while (1)
|
||
|
|
{
|
||
|
|
while (!BN_is_odd(u))
|
||
|
|
{
|
||
|
|
if (!BN_rshift1(u, u)) goto err;
|
||
|
|
if (BN_is_odd(b))
|
||
|
|
{
|
||
|
|
if (!BN_GF2m_add(b, b, p)) goto err;
|
||
|
|
}
|
||
|
|
if (!BN_rshift1(b, b)) goto err;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (BN_abs_is_word(u, 1)) break;
|
||
|
|
|
||
|
|
if (BN_num_bits(u) < BN_num_bits(v))
|
||
|
|
{
|
||
|
|
tmp = u; u = v; v = tmp;
|
||
|
|
tmp = b; b = c; c = tmp;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!BN_GF2m_add(u, u, v)) goto err;
|
||
|
|
if (!BN_GF2m_add(b, b, c)) goto err;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
if (!BN_copy(r, b)) goto err;
|
||
|
|
bn_check_top(r);
|
||
|
|
ret = 1;
|
||
|
|
|
||
|
|
err:
|
||
|
|
BN_CTX_end(ctx);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Invert xx, reduce modulo p, and store the result in r. r could be xx.
|
||
|
|
*
|
||
|
|
* This function calls down to the BN_GF2m_mod_inv implementation; this wrapper
|
||
|
|
* function is only provided for convenience; for best performance, use the
|
||
|
|
* BN_GF2m_mod_inv function.
|
||
|
|
*/
|
||
|
|
int BN_GF2m_mod_inv_arr(BIGNUM *r, const BIGNUM *xx, const int p[], BN_CTX *ctx)
|
||
|
|
{
|
||
|
|
BIGNUM *field;
|
||
|
|
int ret = 0;
|
||
|
|
|
||
|
|
bn_check_top(xx);
|
||
|
|
BN_CTX_start(ctx);
|
||
|
|
if ((field = BN_CTX_get(ctx)) == NULL) goto err;
|
||
|
|
if (!BN_GF2m_arr2poly(p, field)) goto err;
|
||
|
|
|
||
|
|
ret = BN_GF2m_mod_inv(r, xx, field, ctx);
|
||
|
|
bn_check_top(r);
|
||
|
|
|
||
|
|
err:
|
||
|
|
BN_CTX_end(ctx);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
#ifndef OPENSSL_SUN_GF2M_DIV
|
||
|
|
/* Divide y by x, reduce modulo p, and store the result in r. r could be x
|
||
|
|
* or y, x could equal y.
|
||
|
|
*/
|
||
|
|
int BN_GF2m_mod_div(BIGNUM *r, const BIGNUM *y, const BIGNUM *x, const BIGNUM *p, BN_CTX *ctx)
|
||
|
|
{
|
||
|
|
BIGNUM *xinv = NULL;
|
||
|
|
int ret = 0;
|
||
|
|
|
||
|
|
bn_check_top(y);
|
||
|
|
bn_check_top(x);
|
||
|
|
bn_check_top(p);
|
||
|
|
|
||
|
|
BN_CTX_start(ctx);
|
||
|
|
xinv = BN_CTX_get(ctx);
|
||
|
|
if (xinv == NULL) goto err;
|
||
|
|
|
||
|
|
if (!BN_GF2m_mod_inv(xinv, x, p, ctx)) goto err;
|
||
|
|
if (!BN_GF2m_mod_mul(r, y, xinv, p, ctx)) goto err;
|
||
|
|
bn_check_top(r);
|
||
|
|
ret = 1;
|
||
|
|
|
||
|
|
err:
|
||
|
|
BN_CTX_end(ctx);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
#else
|
||
|
|
/* Divide y by x, reduce modulo p, and store the result in r. r could be x
|
||
|
|
* or y, x could equal y.
|
||
|
|
* Uses algorithm Modular_Division_GF(2^m) from
|
||
|
|
* Chang-Shantz, S. "From Euclid's GCD to Montgomery Multiplication to
|
||
|
|
* the Great Divide".
|
||
|
|
*/
|
||
|
|
int BN_GF2m_mod_div(BIGNUM *r, const BIGNUM *y, const BIGNUM *x, const BIGNUM *p, BN_CTX *ctx)
|
||
|
|
{
|
||
|
|
BIGNUM *a, *b, *u, *v;
|
||
|
|
int ret = 0;
|
||
|
|
|
||
|
|
bn_check_top(y);
|
||
|
|
bn_check_top(x);
|
||
|
|
bn_check_top(p);
|
||
|
|
|
||
|
|
BN_CTX_start(ctx);
|
||
|
|
|
||
|
|
a = BN_CTX_get(ctx);
|
||
|
|
b = BN_CTX_get(ctx);
|
||
|
|
u = BN_CTX_get(ctx);
|
||
|
|
v = BN_CTX_get(ctx);
|
||
|
|
if (v == NULL) goto err;
|
||
|
|
|
||
|
|
/* reduce x and y mod p */
|
||
|
|
if (!BN_GF2m_mod(u, y, p)) goto err;
|
||
|
|
if (!BN_GF2m_mod(a, x, p)) goto err;
|
||
|
|
if (!BN_copy(b, p)) goto err;
|
||
|
|
|
||
|
|
while (!BN_is_odd(a))
|
||
|
|
{
|
||
|
|
if (!BN_rshift1(a, a)) goto err;
|
||
|
|
if (BN_is_odd(u)) if (!BN_GF2m_add(u, u, p)) goto err;
|
||
|
|
if (!BN_rshift1(u, u)) goto err;
|
||
|
|
}
|
||
|
|
|
||
|
|
do
|
||
|
|
{
|
||
|
|
if (BN_GF2m_cmp(b, a) > 0)
|
||
|
|
{
|
||
|
|
if (!BN_GF2m_add(b, b, a)) goto err;
|
||
|
|
if (!BN_GF2m_add(v, v, u)) goto err;
|
||
|
|
do
|
||
|
|
{
|
||
|
|
if (!BN_rshift1(b, b)) goto err;
|
||
|
|
if (BN_is_odd(v)) if (!BN_GF2m_add(v, v, p)) goto err;
|
||
|
|
if (!BN_rshift1(v, v)) goto err;
|
||
|
|
} while (!BN_is_odd(b));
|
||
|
|
}
|
||
|
|
else if (BN_abs_is_word(a, 1))
|
||
|
|
break;
|
||
|
|
else
|
||
|
|
{
|
||
|
|
if (!BN_GF2m_add(a, a, b)) goto err;
|
||
|
|
if (!BN_GF2m_add(u, u, v)) goto err;
|
||
|
|
do
|
||
|
|
{
|
||
|
|
if (!BN_rshift1(a, a)) goto err;
|
||
|
|
if (BN_is_odd(u)) if (!BN_GF2m_add(u, u, p)) goto err;
|
||
|
|
if (!BN_rshift1(u, u)) goto err;
|
||
|
|
} while (!BN_is_odd(a));
|
||
|
|
}
|
||
|
|
} while (1);
|
||
|
|
|
||
|
|
if (!BN_copy(r, u)) goto err;
|
||
|
|
bn_check_top(r);
|
||
|
|
ret = 1;
|
||
|
|
|
||
|
|
err:
|
||
|
|
BN_CTX_end(ctx);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/* Divide yy by xx, reduce modulo p, and store the result in r. r could be xx
|
||
|
|
* or yy, xx could equal yy.
|
||
|
|
*
|
||
|
|
* This function calls down to the BN_GF2m_mod_div implementation; this wrapper
|
||
|
|
* function is only provided for convenience; for best performance, use the
|
||
|
|
* BN_GF2m_mod_div function.
|
||
|
|
*/
|
||
|
|
int BN_GF2m_mod_div_arr(BIGNUM *r, const BIGNUM *yy, const BIGNUM *xx, const int p[], BN_CTX *ctx)
|
||
|
|
{
|
||
|
|
BIGNUM *field;
|
||
|
|
int ret = 0;
|
||
|
|
|
||
|
|
bn_check_top(yy);
|
||
|
|
bn_check_top(xx);
|
||
|
|
|
||
|
|
BN_CTX_start(ctx);
|
||
|
|
if ((field = BN_CTX_get(ctx)) == NULL) goto err;
|
||
|
|
if (!BN_GF2m_arr2poly(p, field)) goto err;
|
||
|
|
|
||
|
|
ret = BN_GF2m_mod_div(r, yy, xx, field, ctx);
|
||
|
|
bn_check_top(r);
|
||
|
|
|
||
|
|
err:
|
||
|
|
BN_CTX_end(ctx);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/* Compute the bth power of a, reduce modulo p, and store
|
||
|
|
* the result in r. r could be a.
|
||
|
|
* Uses simple square-and-multiply algorithm A.5.1 from IEEE P1363.
|
||
|
|
*/
|
||
|
|
int BN_GF2m_mod_exp_arr(BIGNUM *r, const BIGNUM *a, const BIGNUM *b, const int p[], BN_CTX *ctx)
|
||
|
|
{
|
||
|
|
int ret = 0, i, n;
|
||
|
|
BIGNUM *u;
|
||
|
|
|
||
|
|
bn_check_top(a);
|
||
|
|
bn_check_top(b);
|
||
|
|
|
||
|
|
if (BN_is_zero(b))
|
||
|
|
return(BN_one(r));
|
||
|
|
|
||
|
|
if (BN_abs_is_word(b, 1))
|
||
|
|
return (BN_copy(r, a) != NULL);
|
||
|
|
|
||
|
|
BN_CTX_start(ctx);
|
||
|
|
if ((u = BN_CTX_get(ctx)) == NULL) goto err;
|
||
|
|
|
||
|
|
if (!BN_GF2m_mod_arr(u, a, p)) goto err;
|
||
|
|
|
||
|
|
n = BN_num_bits(b) - 1;
|
||
|
|
for (i = n - 1; i >= 0; i--)
|
||
|
|
{
|
||
|
|
if (!BN_GF2m_mod_sqr_arr(u, u, p, ctx)) goto err;
|
||
|
|
if (BN_is_bit_set(b, i))
|
||
|
|
{
|
||
|
|
if (!BN_GF2m_mod_mul_arr(u, u, a, p, ctx)) goto err;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if (!BN_copy(r, u)) goto err;
|
||
|
|
bn_check_top(r);
|
||
|
|
ret = 1;
|
||
|
|
err:
|
||
|
|
BN_CTX_end(ctx);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Compute the bth power of a, reduce modulo p, and store
|
||
|
|
* the result in r. r could be a.
|
||
|
|
*
|
||
|
|
* This function calls down to the BN_GF2m_mod_exp_arr implementation; this wrapper
|
||
|
|
* function is only provided for convenience; for best performance, use the
|
||
|
|
* BN_GF2m_mod_exp_arr function.
|
||
|
|
*/
|
||
|
|
int BN_GF2m_mod_exp(BIGNUM *r, const BIGNUM *a, const BIGNUM *b, const BIGNUM *p, BN_CTX *ctx)
|
||
|
|
{
|
||
|
|
int ret = 0;
|
||
|
|
const int max = BN_num_bits(p) + 1;
|
||
|
|
int *arr=NULL;
|
||
|
|
bn_check_top(a);
|
||
|
|
bn_check_top(b);
|
||
|
|
bn_check_top(p);
|
||
|
|
if ((arr = (int *)OPENSSL_malloc(sizeof(int) * max)) == NULL) goto err;
|
||
|
|
ret = BN_GF2m_poly2arr(p, arr, max);
|
||
|
|
if (!ret || ret > max)
|
||
|
|
{
|
||
|
|
BNerr(BN_F_BN_GF2M_MOD_EXP,BN_R_INVALID_LENGTH);
|
||
|
|
goto err;
|
||
|
|
}
|
||
|
|
ret = BN_GF2m_mod_exp_arr(r, a, b, arr, ctx);
|
||
|
|
bn_check_top(r);
|
||
|
|
err:
|
||
|
|
if (arr) OPENSSL_free(arr);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Compute the square root of a, reduce modulo p, and store
|
||
|
|
* the result in r. r could be a.
|
||
|
|
* Uses exponentiation as in algorithm A.4.1 from IEEE P1363.
|
||
|
|
*/
|
||
|
|
int BN_GF2m_mod_sqrt_arr(BIGNUM *r, const BIGNUM *a, const int p[], BN_CTX *ctx)
|
||
|
|
{
|
||
|
|
int ret = 0;
|
||
|
|
BIGNUM *u;
|
||
|
|
|
||
|
|
bn_check_top(a);
|
||
|
|
|
||
|
|
if (!p[0])
|
||
|
|
{
|
||
|
|
/* reduction mod 1 => return 0 */
|
||
|
|
BN_zero(r);
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
BN_CTX_start(ctx);
|
||
|
|
if ((u = BN_CTX_get(ctx)) == NULL) goto err;
|
||
|
|
|
||
|
|
if (!BN_set_bit(u, p[0] - 1)) goto err;
|
||
|
|
ret = BN_GF2m_mod_exp_arr(r, a, u, p, ctx);
|
||
|
|
bn_check_top(r);
|
||
|
|
|
||
|
|
err:
|
||
|
|
BN_CTX_end(ctx);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Compute the square root of a, reduce modulo p, and store
|
||
|
|
* the result in r. r could be a.
|
||
|
|
*
|
||
|
|
* This function calls down to the BN_GF2m_mod_sqrt_arr implementation; this wrapper
|
||
|
|
* function is only provided for convenience; for best performance, use the
|
||
|
|
* BN_GF2m_mod_sqrt_arr function.
|
||
|
|
*/
|
||
|
|
int BN_GF2m_mod_sqrt(BIGNUM *r, const BIGNUM *a, const BIGNUM *p, BN_CTX *ctx)
|
||
|
|
{
|
||
|
|
int ret = 0;
|
||
|
|
const int max = BN_num_bits(p) + 1;
|
||
|
|
int *arr=NULL;
|
||
|
|
bn_check_top(a);
|
||
|
|
bn_check_top(p);
|
||
|
|
if ((arr = (int *)OPENSSL_malloc(sizeof(int) * max)) == NULL) goto err;
|
||
|
|
ret = BN_GF2m_poly2arr(p, arr, max);
|
||
|
|
if (!ret || ret > max)
|
||
|
|
{
|
||
|
|
BNerr(BN_F_BN_GF2M_MOD_SQRT,BN_R_INVALID_LENGTH);
|
||
|
|
goto err;
|
||
|
|
}
|
||
|
|
ret = BN_GF2m_mod_sqrt_arr(r, a, arr, ctx);
|
||
|
|
bn_check_top(r);
|
||
|
|
err:
|
||
|
|
if (arr) OPENSSL_free(arr);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Find r such that r^2 + r = a mod p. r could be a. If no r exists returns 0.
|
||
|
|
* Uses algorithms A.4.7 and A.4.6 from IEEE P1363.
|
||
|
|
*/
|
||
|
|
int BN_GF2m_mod_solve_quad_arr(BIGNUM *r, const BIGNUM *a_, const int p[], BN_CTX *ctx)
|
||
|
|
{
|
||
|
|
int ret = 0, count = 0, j;
|
||
|
|
BIGNUM *a, *z, *rho, *w, *w2, *tmp;
|
||
|
|
|
||
|
|
bn_check_top(a_);
|
||
|
|
|
||
|
|
if (!p[0])
|
||
|
|
{
|
||
|
|
/* reduction mod 1 => return 0 */
|
||
|
|
BN_zero(r);
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
BN_CTX_start(ctx);
|
||
|
|
a = BN_CTX_get(ctx);
|
||
|
|
z = BN_CTX_get(ctx);
|
||
|
|
w = BN_CTX_get(ctx);
|
||
|
|
if (w == NULL) goto err;
|
||
|
|
|
||
|
|
if (!BN_GF2m_mod_arr(a, a_, p)) goto err;
|
||
|
|
|
||
|
|
if (BN_is_zero(a))
|
||
|
|
{
|
||
|
|
BN_zero(r);
|
||
|
|
ret = 1;
|
||
|
|
goto err;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (p[0] & 0x1) /* m is odd */
|
||
|
|
{
|
||
|
|
/* compute half-trace of a */
|
||
|
|
if (!BN_copy(z, a)) goto err;
|
||
|
|
for (j = 1; j <= (p[0] - 1) / 2; j++)
|
||
|
|
{
|
||
|
|
if (!BN_GF2m_mod_sqr_arr(z, z, p, ctx)) goto err;
|
||
|
|
if (!BN_GF2m_mod_sqr_arr(z, z, p, ctx)) goto err;
|
||
|
|
if (!BN_GF2m_add(z, z, a)) goto err;
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
else /* m is even */
|
||
|
|
{
|
||
|
|
rho = BN_CTX_get(ctx);
|
||
|
|
w2 = BN_CTX_get(ctx);
|
||
|
|
tmp = BN_CTX_get(ctx);
|
||
|
|
if (tmp == NULL) goto err;
|
||
|
|
do
|
||
|
|
{
|
||
|
|
if (!BN_rand(rho, p[0], 0, 0)) goto err;
|
||
|
|
if (!BN_GF2m_mod_arr(rho, rho, p)) goto err;
|
||
|
|
BN_zero(z);
|
||
|
|
if (!BN_copy(w, rho)) goto err;
|
||
|
|
for (j = 1; j <= p[0] - 1; j++)
|
||
|
|
{
|
||
|
|
if (!BN_GF2m_mod_sqr_arr(z, z, p, ctx)) goto err;
|
||
|
|
if (!BN_GF2m_mod_sqr_arr(w2, w, p, ctx)) goto err;
|
||
|
|
if (!BN_GF2m_mod_mul_arr(tmp, w2, a, p, ctx)) goto err;
|
||
|
|
if (!BN_GF2m_add(z, z, tmp)) goto err;
|
||
|
|
if (!BN_GF2m_add(w, w2, rho)) goto err;
|
||
|
|
}
|
||
|
|
count++;
|
||
|
|
} while (BN_is_zero(w) && (count < MAX_ITERATIONS));
|
||
|
|
if (BN_is_zero(w))
|
||
|
|
{
|
||
|
|
BNerr(BN_F_BN_GF2M_MOD_SOLVE_QUAD_ARR,BN_R_TOO_MANY_ITERATIONS);
|
||
|
|
goto err;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!BN_GF2m_mod_sqr_arr(w, z, p, ctx)) goto err;
|
||
|
|
if (!BN_GF2m_add(w, z, w)) goto err;
|
||
|
|
if (BN_GF2m_cmp(w, a))
|
||
|
|
{
|
||
|
|
BNerr(BN_F_BN_GF2M_MOD_SOLVE_QUAD_ARR, BN_R_NO_SOLUTION);
|
||
|
|
goto err;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!BN_copy(r, z)) goto err;
|
||
|
|
bn_check_top(r);
|
||
|
|
|
||
|
|
ret = 1;
|
||
|
|
|
||
|
|
err:
|
||
|
|
BN_CTX_end(ctx);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Find r such that r^2 + r = a mod p. r could be a. If no r exists returns 0.
|
||
|
|
*
|
||
|
|
* This function calls down to the BN_GF2m_mod_solve_quad_arr implementation; this wrapper
|
||
|
|
* function is only provided for convenience; for best performance, use the
|
||
|
|
* BN_GF2m_mod_solve_quad_arr function.
|
||
|
|
*/
|
||
|
|
int BN_GF2m_mod_solve_quad(BIGNUM *r, const BIGNUM *a, const BIGNUM *p, BN_CTX *ctx)
|
||
|
|
{
|
||
|
|
int ret = 0;
|
||
|
|
const int max = BN_num_bits(p) + 1;
|
||
|
|
int *arr=NULL;
|
||
|
|
bn_check_top(a);
|
||
|
|
bn_check_top(p);
|
||
|
|
if ((arr = (int *)OPENSSL_malloc(sizeof(int) *
|
||
|
|
max)) == NULL) goto err;
|
||
|
|
ret = BN_GF2m_poly2arr(p, arr, max);
|
||
|
|
if (!ret || ret > max)
|
||
|
|
{
|
||
|
|
BNerr(BN_F_BN_GF2M_MOD_SOLVE_QUAD,BN_R_INVALID_LENGTH);
|
||
|
|
goto err;
|
||
|
|
}
|
||
|
|
ret = BN_GF2m_mod_solve_quad_arr(r, a, arr, ctx);
|
||
|
|
bn_check_top(r);
|
||
|
|
err:
|
||
|
|
if (arr) OPENSSL_free(arr);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Convert the bit-string representation of a polynomial
|
||
|
|
* ( \sum_{i=0}^n a_i * x^i) into an array of integers corresponding
|
||
|
|
* to the bits with non-zero coefficient. Array is terminated with -1.
|
||
|
|
* Up to max elements of the array will be filled. Return value is total
|
||
|
|
* number of array elements that would be filled if array was large enough.
|
||
|
|
*/
|
||
|
|
int BN_GF2m_poly2arr(const BIGNUM *a, int p[], int max)
|
||
|
|
{
|
||
|
|
int i, j, k = 0;
|
||
|
|
BN_ULONG mask;
|
||
|
|
|
||
|
|
if (BN_is_zero(a))
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
for (i = a->top - 1; i >= 0; i--)
|
||
|
|
{
|
||
|
|
if (!a->d[i])
|
||
|
|
/* skip word if a->d[i] == 0 */
|
||
|
|
continue;
|
||
|
|
mask = BN_TBIT;
|
||
|
|
for (j = BN_BITS2 - 1; j >= 0; j--)
|
||
|
|
{
|
||
|
|
if (a->d[i] & mask)
|
||
|
|
{
|
||
|
|
if (k < max) p[k] = BN_BITS2 * i + j;
|
||
|
|
k++;
|
||
|
|
}
|
||
|
|
mask >>= 1;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (k < max) {
|
||
|
|
p[k] = -1;
|
||
|
|
k++;
|
||
|
|
}
|
||
|
|
|
||
|
|
return k;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Convert the coefficient array representation of a polynomial to a
|
||
|
|
* bit-string. The array must be terminated by -1.
|
||
|
|
*/
|
||
|
|
int BN_GF2m_arr2poly(const int p[], BIGNUM *a)
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
|
||
|
|
bn_check_top(a);
|
||
|
|
BN_zero(a);
|
||
|
|
for (i = 0; p[i] != -1; i++)
|
||
|
|
{
|
||
|
|
if (BN_set_bit(a, p[i]) == 0)
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
bn_check_top(a);
|
||
|
|
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
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