sl@0: /* crypto/bn/bn_nist.c */
sl@0: /*
sl@0:  * Written by Nils Larsch for the OpenSSL project
sl@0:  */
sl@0: /* ====================================================================
sl@0:  * Copyright (c) 1998-2005 The OpenSSL Project.  All rights reserved.
sl@0:  *
sl@0:  * Redistribution and use in source and binary forms, with or without
sl@0:  * modification, are permitted provided that the following conditions
sl@0:  * are met:
sl@0:  *
sl@0:  * 1. Redistributions of source code must retain the above copyright
sl@0:  *    notice, this list of conditions and the following disclaimer. 
sl@0:  *
sl@0:  * 2. Redistributions in binary form must reproduce the above copyright
sl@0:  *    notice, this list of conditions and the following disclaimer in
sl@0:  *    the documentation and/or other materials provided with the
sl@0:  *    distribution.
sl@0:  *
sl@0:  * 3. All advertising materials mentioning features or use of this
sl@0:  *    software must display the following acknowledgment:
sl@0:  *    "This product includes software developed by the OpenSSL Project
sl@0:  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
sl@0:  *
sl@0:  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
sl@0:  *    endorse or promote products derived from this software without
sl@0:  *    prior written permission. For written permission, please contact
sl@0:  *    openssl-core@openssl.org.
sl@0:  *
sl@0:  * 5. Products derived from this software may not be called "OpenSSL"
sl@0:  *    nor may "OpenSSL" appear in their names without prior written
sl@0:  *    permission of the OpenSSL Project.
sl@0:  *
sl@0:  * 6. Redistributions of any form whatsoever must retain the following
sl@0:  *    acknowledgment:
sl@0:  *    "This product includes software developed by the OpenSSL Project
sl@0:  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
sl@0:  *
sl@0:  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
sl@0:  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
sl@0:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
sl@0:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
sl@0:  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
sl@0:  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
sl@0:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
sl@0:  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
sl@0:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
sl@0:  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
sl@0:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
sl@0:  * OF THE POSSIBILITY OF SUCH DAMAGE.
sl@0:  * ====================================================================
sl@0:  *
sl@0:  * This product includes cryptographic software written by Eric Young
sl@0:  * (eay@cryptsoft.com).  This product includes software written by Tim
sl@0:  * Hudson (tjh@cryptsoft.com).
sl@0:  *
sl@0:  */
sl@0:  /*
sl@0:  © Portions copyright (c) 2006 Nokia Corporation.  All rights reserved.
sl@0:  */
sl@0: 
sl@0: 
sl@0: 
sl@0: #include "bn_lcl.h"
sl@0: #include "cryptlib.h"
sl@0: #if (defined(SYMBIAN) && (defined(__WINSCW__) || defined(__WINS__)))
sl@0: #include "libcrypto_wsd_macros.h"
sl@0: #include "libcrypto_wsd.h"
sl@0: #endif
sl@0: 
sl@0: 
sl@0: #define BN_NIST_192_TOP	(192+BN_BITS2-1)/BN_BITS2
sl@0: #define BN_NIST_224_TOP	(224+BN_BITS2-1)/BN_BITS2
sl@0: #define BN_NIST_256_TOP	(256+BN_BITS2-1)/BN_BITS2
sl@0: #define BN_NIST_384_TOP	(384+BN_BITS2-1)/BN_BITS2
sl@0: #define BN_NIST_521_TOP	(521+BN_BITS2-1)/BN_BITS2
sl@0: 
sl@0: 
sl@0: #if BN_BITS2 == 64
sl@0: static const BN_ULONG _nist_p_192[] =
sl@0: 	{0xFFFFFFFFFFFFFFFFULL,0xFFFFFFFFFFFFFFFEULL,
sl@0: 	0xFFFFFFFFFFFFFFFFULL};
sl@0: static const BN_ULONG _nist_p_224[] =
sl@0: 	{0x0000000000000001ULL,0xFFFFFFFF00000000ULL,
sl@0: 	0xFFFFFFFFFFFFFFFFULL,0x00000000FFFFFFFFULL};
sl@0: static const BN_ULONG _nist_p_256[] =
sl@0: 	{0xFFFFFFFFFFFFFFFFULL,0x00000000FFFFFFFFULL,
sl@0: 	0x0000000000000000ULL,0xFFFFFFFF00000001ULL};
sl@0: static const BN_ULONG _nist_p_384[] =
sl@0: 	{0x00000000FFFFFFFFULL,0xFFFFFFFF00000000ULL,
sl@0: 	0xFFFFFFFFFFFFFFFEULL,0xFFFFFFFFFFFFFFFFULL,
sl@0: 	0xFFFFFFFFFFFFFFFFULL,0xFFFFFFFFFFFFFFFFULL};
sl@0: static const BN_ULONG _nist_p_521[] =
sl@0: 	{0xFFFFFFFFFFFFFFFFULL,0xFFFFFFFFFFFFFFFFULL,
sl@0: 	0xFFFFFFFFFFFFFFFFULL,0xFFFFFFFFFFFFFFFFULL,
sl@0: 	0xFFFFFFFFFFFFFFFFULL,0xFFFFFFFFFFFFFFFFULL,
sl@0: 	0xFFFFFFFFFFFFFFFFULL,0xFFFFFFFFFFFFFFFFULL,
sl@0: 	0x00000000000001FFULL};
sl@0: #elif BN_BITS2 == 32
sl@0: static const BN_ULONG _nist_p_192[] = {0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFE,
sl@0: 	0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF};
sl@0: static const BN_ULONG _nist_p_224[] = {0x00000001,0x00000000,0x00000000,
sl@0: 	0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF};
sl@0: static const BN_ULONG _nist_p_256[] = {0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,
sl@0: 	0x00000000,0x00000000,0x00000000,0x00000001,0xFFFFFFFF};
sl@0: static const BN_ULONG _nist_p_384[] = {0xFFFFFFFF,0x00000000,0x00000000,
sl@0: 	0xFFFFFFFF,0xFFFFFFFE,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,
sl@0: 	0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF};
sl@0: static const BN_ULONG _nist_p_521[] = {0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,
sl@0: 	0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,
sl@0: 	0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,0xFFFFFFFF,
sl@0: 	0xFFFFFFFF,0x000001FF};
sl@0: #elif BN_BITS2 == 16
sl@0: static const BN_ULONG _nist_p_192[] = {0xFFFF,0xFFFF,0xFFFF,0xFFFF,0xFFFE,
sl@0: 	0xFFFF,0xFFFF,0xFFFF,0xFFFF,0xFFFF,0xFFFF,0xFFFF};
sl@0: static const BN_ULONG _nist_p_224[] = {0x0001,0x0000,0x0000,0x0000,0x0000,
sl@0: 	0x0000,0xFFFF,0xFFFF,0xFFFF,0xFFFF,0xFFFF,0xFFFF,0xFFFF,0xFFFF};
sl@0: static const BN_ULONG _nist_p_256[] = {0xFFFF,0xFFFF,0xFFFF,0xFFFF,0xFFFF,
sl@0: 	0xFFFF,0x0000,0x0000,0x0000,0x0000,0x0000,0x0000,0x0001,0x0000,0xFFFF,
sl@0: 	0xFFFF};
sl@0: static const BN_ULONG _nist_p_384[] = {0xFFFF,0xFFFF,0x0000,0x0000,0x0000,
sl@0: 	0x0000,0xFFFF,0xFFFF,0xFFFE,0xFFFF,0xFFFF,0xFFFF,0xFFFF,0xFFFF,0xFFFF,
sl@0: 	0xFFFF,0xFFFF,0xFFFF,0xFFFF,0xFFFF,0xFFFF,0xFFFF,0xFFFF,0xFFFF};
sl@0: static const BN_ULONG _nist_p_521[] = {0xFFFF,0xFFFF,0xFFFF,0xFFFF,0xFFFF,
sl@0: 	0xFFFF,0xFFFF,0xFFFF,0xFFFF,0xFFFF,0xFFFF,0xFFFF,0xFFFF,0xFFFF,0xFFFF,
sl@0: 	0xFFFF,0xFFFF,0xFFFF,0xFFFF,0xFFFF,0xFFFF,0xFFFF,0xFFFF,0xFFFF,0xFFFF,
sl@0: 	0xFFFF,0xFFFF,0xFFFF,0xFFFF,0xFFFF,0xFFFF,0xFFFF,0x01FF};
sl@0: #elif BN_BITS2 == 8
sl@0: static const BN_ULONG _nist_p_192[] = {0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
sl@0: 	0xFE,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
sl@0: 	0xFF,0xFF};
sl@0: static const BN_ULONG _nist_p_224[] = {0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
sl@0: 	0x00,0x00,0x00,0x00,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
sl@0: 	0xFF,0xFF,0xFF,0xFF,0xFF,0xFF};
sl@0: static const BN_ULONG _nist_p_256[] = {0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
sl@0: 	0xFF,0xFF,0xFF,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
sl@0: 	0x00,0x00,0x01,0x00,0x00,0x00,0xFF,0xFF,0xFF,0xFF};
sl@0: static const BN_ULONG _nist_p_384[] = {0xFF,0xFF,0xFF,0xFF,0x00,0x00,0x00,0x00,
sl@0: 	0x00,0x00,0x00,0x00,0xFF,0xFF,0xFF,0xFF,0xFE,0xFF,0xFF,0xFF,0xFF,0xFF,
sl@0: 	0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
sl@0: 	0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF};
sl@0: static const BN_ULONG _nist_p_521[] = {0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
sl@0: 	0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
sl@0: 	0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
sl@0: 	0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
sl@0: 	0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
sl@0: 	0xFF,0x01};
sl@0: #endif
sl@0: 
sl@0: 
sl@0: 
sl@0: 
sl@0: EXPORT_C const BIGNUM *BN_get0_nist_prime_192(void)
sl@0: 	{
sl@0: #ifndef EMULATOR	
sl@0: 	static BIGNUM const_nist_192 = { (BN_ULONG *)_nist_p_192,
sl@0: 		BN_NIST_192_TOP, BN_NIST_192_TOP, 0, BN_FLG_STATIC_DATA };
sl@0: #else
sl@0: 	static const BIGNUM const_nist_192 = { (BN_ULONG *)_nist_p_192,
sl@0: 		BN_NIST_192_TOP, BN_NIST_192_TOP, 0, BN_FLG_STATIC_DATA };
sl@0: 	
sl@0: #endif	
sl@0: 	return &const_nist_192;
sl@0: 	}
sl@0: 
sl@0: EXPORT_C const BIGNUM *BN_get0_nist_prime_224(void)
sl@0: 	{
sl@0: #ifndef EMULATOR		
sl@0: 	static BIGNUM const_nist_224 = { (BN_ULONG *)_nist_p_224,
sl@0: 		BN_NIST_224_TOP, BN_NIST_224_TOP, 0, BN_FLG_STATIC_DATA };
sl@0: #else
sl@0:     static const  BIGNUM const_nist_224 = { (BN_ULONG *)_nist_p_224,
sl@0: 		BN_NIST_224_TOP, BN_NIST_224_TOP, 0, BN_FLG_STATIC_DATA };
sl@0: 		
sl@0: #endif		
sl@0: 
sl@0: 	return &const_nist_224;
sl@0: 	}
sl@0: 
sl@0: EXPORT_C const BIGNUM *BN_get0_nist_prime_256(void)
sl@0: 	{
sl@0: #ifndef EMULATOR		
sl@0: 	static BIGNUM const_nist_256 = { (BN_ULONG *)_nist_p_256,
sl@0: 		BN_NIST_256_TOP, BN_NIST_256_TOP, 0, BN_FLG_STATIC_DATA };
sl@0: #else		
sl@0:     static const BIGNUM const_nist_256 = { (BN_ULONG *)_nist_p_256,
sl@0: 		BN_NIST_256_TOP, BN_NIST_256_TOP, 0, BN_FLG_STATIC_DATA };
sl@0: 
sl@0: #endif		
sl@0: 	return &const_nist_256;
sl@0: 	}
sl@0: 
sl@0: EXPORT_C const BIGNUM *BN_get0_nist_prime_384(void)
sl@0: 	{
sl@0: #ifndef EMULATOR		
sl@0: 	static BIGNUM const_nist_384 = { (BN_ULONG *)_nist_p_384,
sl@0: 		BN_NIST_384_TOP, BN_NIST_384_TOP, 0, BN_FLG_STATIC_DATA };
sl@0: #else
sl@0:     static const BIGNUM const_nist_384 = { (BN_ULONG *)_nist_p_384,
sl@0: 		BN_NIST_384_TOP, BN_NIST_384_TOP, 0, BN_FLG_STATIC_DATA };
sl@0: 		
sl@0: #endif		
sl@0: 	return &const_nist_384;
sl@0: 	}
sl@0: 
sl@0: EXPORT_C const BIGNUM *BN_get0_nist_prime_521(void)
sl@0: 	{
sl@0: #ifndef EMULATOR		
sl@0: 	static BIGNUM const_nist_521 = { (BN_ULONG *)_nist_p_521,
sl@0: 		BN_NIST_521_TOP, BN_NIST_521_TOP, 0, BN_FLG_STATIC_DATA };
sl@0: #else
sl@0: 	static const BIGNUM const_nist_521 = { (BN_ULONG *)_nist_p_521,
sl@0: 		BN_NIST_521_TOP, BN_NIST_521_TOP, 0, BN_FLG_STATIC_DATA };
sl@0: 		
sl@0: #endif		
sl@0: 	return &const_nist_521;
sl@0: 	}
sl@0: 
sl@0: /* some misc internal functions */
sl@0: #if BN_BITS2 != 64
sl@0: #ifndef EMULATOR
sl@0: static BN_ULONG _256_data[BN_NIST_256_TOP*6];
sl@0: static int _is_set_256_data = 0;
sl@0: static void _init_256_data(void);
sl@0: 
sl@0: static BN_ULONG _384_data[BN_NIST_384_TOP*8];
sl@0: static int _is_set_384_data = 0;
sl@0: static void _init_384_data(void);
sl@0: #else
sl@0: GET_STATIC_ARRAY_FROM_TLS(_256_data,bn_nist,BN_ULONG)
sl@0: #define _256_data (GET_WSD_VAR_NAME(_256_data,bn_nist, s)())
sl@0: GET_STATIC_VAR_FROM_TLS(_is_set_256_data,bn_nist,int)
sl@0: #define _is_set_256_data (*GET_WSD_VAR_NAME(_is_set_256_data,bn_nist, s)())
sl@0: 
sl@0: GET_STATIC_ARRAY_FROM_TLS(_384_data,bn_nist,BN_ULONG)
sl@0: #define _384_data (GET_WSD_VAR_NAME(_384_data,bn_nist, s)())
sl@0: GET_STATIC_VAR_FROM_TLS(_is_set_384_data,bn_nist,int)
sl@0: #define _is_set_384_data (*GET_WSD_VAR_NAME(_is_set_384_data,bn_nist, s)())
sl@0: #endif
sl@0: #endif
sl@0: 
sl@0: #define BN_NIST_ADD_ONE(a)	while (!(++(*(a)))) ++(a);
sl@0: 
sl@0: static void nist_cp_bn_0(BN_ULONG *buf, BN_ULONG *a, int top, int max)
sl@0:         {
sl@0: 	int i;
sl@0:         BN_ULONG *_tmp1 = (buf), *_tmp2 = (a);
sl@0:         for (i = (top); i != 0; i--)
sl@0:                 *_tmp1++ = *_tmp2++;
sl@0:         for (i = (max) - (top); i != 0; i--)
sl@0:                 *_tmp1++ = (BN_ULONG) 0;
sl@0:         }
sl@0: 
sl@0: static void nist_cp_bn(BN_ULONG *buf, BN_ULONG *a, int top)
sl@0:         { 
sl@0: 	int i;
sl@0:         BN_ULONG *_tmp1 = (buf), *_tmp2 = (a);
sl@0:         for (i = (top); i != 0; i--)
sl@0:                 *_tmp1++ = *_tmp2++;
sl@0:         }
sl@0: 
sl@0: #if BN_BITS2 == 64
sl@0: #define bn_cp_64(to, n, from, m)	(to)[n] = (from)[m];
sl@0: #define bn_64_set_0(to, n)		(to)[n] = (BN_ULONG)0;
sl@0: /* TBD */
sl@0: #define bn_cp_32(to, n, from, m)	(to)[n] = (from)[m];
sl@0: #define bn_32_set_0(to, n)		(to)[n] = (BN_ULONG)0;
sl@0: #else
sl@0: #define bn_cp_64(to, n, from, m) \
sl@0: 	{ \
sl@0: 	bn_cp_32(to, (n)*2, from, (m)*2); \
sl@0: 	bn_cp_32(to, (n)*2+1, from, (m)*2+1); \
sl@0: 	}
sl@0: #define bn_64_set_0(to, n) \
sl@0: 	{ \
sl@0: 	bn_32_set_0(to, (n)*2); \
sl@0: 	bn_32_set_0(to, (n)*2+1); \
sl@0: 	}
sl@0: #if BN_BITS2 == 32
sl@0: #define bn_cp_32(to, n, from, m)	(to)[n] = (from)[m];
sl@0: #define bn_32_set_0(to, n)		(to)[n] = (BN_ULONG)0;
sl@0: #elif BN_BITS2 == 16
sl@0: #define bn_cp_32(to, n, from, m) \
sl@0: 	{ \
sl@0: 	(to)[(n)*2]   = (from)[(m)*2];  \
sl@0: 	(to)[(n)*2+1] = (from)[(m)*2+1];\
sl@0: 	}
sl@0: #define bn_32_set_0(to, n) { (to)[(n)*2] = 0; (to)[(n)*2+1] = 0; }
sl@0: #elif BN_BITS2 == 8
sl@0: #define bn_cp_32(to, n, from, m) \
sl@0: 	{ \
sl@0: 	(to)[(n)*4]   = (from)[(m)*4];  \
sl@0: 	(to)[(n)*4+1] = (from)[(m)*4+1];\
sl@0: 	(to)[(n)*4+2] = (from)[(m)*4+2];\
sl@0: 	(to)[(n)*4+3] = (from)[(m)*4+3];\
sl@0: 	}
sl@0: #define bn_32_set_0(to, n) \
sl@0: 	{ (to)[(n)*4]   = (BN_ULONG)0; (to)[(n)*4+1] = (BN_ULONG)0; \
sl@0: 	  (to)[(n)*4+2] = (BN_ULONG)0; (to)[(n)*4+3] = (BN_ULONG)0; }
sl@0: #endif
sl@0: #endif /* BN_BITS2 != 64 */
sl@0: 
sl@0: 
sl@0: #define nist_set_192(to, from, a1, a2, a3) \
sl@0: 	{ \
sl@0: 	if (a3 != 0) bn_cp_64(to, 0, from, (a3) - 3) else bn_64_set_0(to, 0)\
sl@0: 	bn_cp_64(to, 1, from, (a2) - 3) \
sl@0: 	if (a1 != 0) bn_cp_64(to, 2, from, (a1) - 3) else bn_64_set_0(to, 2)\
sl@0: 	}
sl@0: 
sl@0: EXPORT_C int BN_nist_mod_192(BIGNUM *r, const BIGNUM *a, const BIGNUM *field,
sl@0: 	BN_CTX *ctx)
sl@0: 	{
sl@0: 	int      top = a->top, i;
sl@0: 	BN_ULONG carry = 0;
sl@0: 	register BN_ULONG *r_d, *a_d = a->d;
sl@0: 	BN_ULONG t_d[BN_NIST_192_TOP],
sl@0: 	         buf[BN_NIST_192_TOP];
sl@0: 
sl@0: 	i = BN_ucmp(field, a);
sl@0: 	if (i == 0)
sl@0: 		{
sl@0: 		BN_zero(r);
sl@0: 		return 1;
sl@0: 		}
sl@0: 	else if (i > 0)
sl@0: 		return (r == a) ? 1 : (BN_copy(r ,a) != NULL);
sl@0: 
sl@0: 	if (top == BN_NIST_192_TOP)
sl@0: 		return BN_usub(r, a, field);
sl@0: 
sl@0: 	if (r != a)
sl@0: 		{
sl@0: 		if (!bn_wexpand(r, BN_NIST_192_TOP))
sl@0: 			return 0;
sl@0: 		r_d = r->d;
sl@0: 		nist_cp_bn(r_d, a_d, BN_NIST_192_TOP);
sl@0: 		}
sl@0: 	else
sl@0: 		r_d = a_d;
sl@0: 
sl@0: 	nist_cp_bn_0(buf, a_d + BN_NIST_192_TOP, top - BN_NIST_192_TOP, BN_NIST_192_TOP);
sl@0: 
sl@0: #if defined(OPENSSL_SYS_VMS) && defined(__DECC)
sl@0: # pragma message save
sl@0: # pragma message disable BADSUBSCRIPT
sl@0: #endif
sl@0: 
sl@0: 	nist_set_192(t_d, buf, 0, 3, 3);
sl@0: 	if (bn_add_words(r_d, r_d, t_d, BN_NIST_192_TOP))
sl@0: 		++carry;
sl@0: 
sl@0: 	nist_set_192(t_d, buf, 4, 4, 0);
sl@0: 	if (bn_add_words(r_d, r_d, t_d, BN_NIST_192_TOP))
sl@0: 		++carry;
sl@0: 
sl@0: #if defined(OPENSSL_SYS_VMS) && defined(__DECC)
sl@0: # pragma message restore
sl@0: #endif
sl@0: 
sl@0: 	nist_set_192(t_d, buf, 5, 5, 5)
sl@0: 	if (bn_add_words(r_d, r_d, t_d, BN_NIST_192_TOP))
sl@0: 		++carry;
sl@0: 
sl@0: 	while (carry)
sl@0: 		{
sl@0: 		if (bn_sub_words(r_d, r_d, _nist_p_192, BN_NIST_192_TOP))
sl@0: 			--carry; 
sl@0: 		}
sl@0: 	r->top = BN_NIST_192_TOP;
sl@0: 	bn_correct_top(r);
sl@0: 	if (BN_ucmp(r, field) >= 0)
sl@0: 		{
sl@0: 		bn_sub_words(r_d, r_d, _nist_p_192, BN_NIST_192_TOP);
sl@0: 		bn_correct_top(r);
sl@0: 		}
sl@0: 
sl@0: 	bn_check_top(r);
sl@0: 	return 1;
sl@0: 	}
sl@0: 
sl@0: #define nist_set_224(to, from, a1, a2, a3, a4, a5, a6, a7) \
sl@0: 	{ \
sl@0: 	if (a7 != 0) bn_cp_32(to, 0, from, (a7) - 7) else bn_32_set_0(to, 0)\
sl@0: 	if (a6 != 0) bn_cp_32(to, 1, from, (a6) - 7) else bn_32_set_0(to, 1)\
sl@0: 	if (a5 != 0) bn_cp_32(to, 2, from, (a5) - 7) else bn_32_set_0(to, 2)\
sl@0: 	if (a4 != 0) bn_cp_32(to, 3, from, (a4) - 7) else bn_32_set_0(to, 3)\
sl@0: 	if (a3 != 0) bn_cp_32(to, 4, from, (a3) - 7) else bn_32_set_0(to, 4)\
sl@0: 	if (a2 != 0) bn_cp_32(to, 5, from, (a2) - 7) else bn_32_set_0(to, 5)\
sl@0: 	if (a1 != 0) bn_cp_32(to, 6, from, (a1) - 7) else bn_32_set_0(to, 6)\
sl@0: 	}
sl@0: 
sl@0: EXPORT_C int BN_nist_mod_224(BIGNUM *r, const BIGNUM *a, const BIGNUM *field,
sl@0: 	BN_CTX *ctx)
sl@0: 	{
sl@0: #if BN_BITS2 != 64
sl@0: 	int	top = a->top, i;
sl@0: 	int	carry = 0;
sl@0: 	BN_ULONG *r_d, *a_d = a->d;
sl@0: 	BN_ULONG t_d[BN_NIST_224_TOP],
sl@0: 	         buf[BN_NIST_224_TOP];
sl@0: 
sl@0: 	i = BN_ucmp(field, a);
sl@0: 	if (i == 0)
sl@0: 		{
sl@0: 		BN_zero(r);
sl@0: 		return 1;
sl@0: 		}
sl@0: 	else if (i > 0)
sl@0: 		return (r == a)? 1 : (BN_copy(r ,a) != NULL);
sl@0: 
sl@0: 	if (top == BN_NIST_224_TOP)
sl@0: 		return BN_usub(r, a, field);
sl@0: 
sl@0: 	if (r != a)
sl@0: 		{
sl@0: 		if (!bn_wexpand(r, BN_NIST_224_TOP))
sl@0: 			return 0;
sl@0: 		r_d = r->d;
sl@0: 		nist_cp_bn(r_d, a_d, BN_NIST_224_TOP);
sl@0: 		}
sl@0: 	else
sl@0: 		r_d = a_d;
sl@0: 
sl@0: 	nist_cp_bn_0(buf, a_d + BN_NIST_224_TOP, top - BN_NIST_224_TOP, BN_NIST_224_TOP);
sl@0: 
sl@0: 	nist_set_224(t_d, buf, 10, 9, 8, 7, 0, 0, 0);
sl@0: 	if (bn_add_words(r_d, r_d, t_d, BN_NIST_224_TOP))
sl@0: 		++carry;
sl@0: 	nist_set_224(t_d, buf, 0, 13, 12, 11, 0, 0, 0);
sl@0: 	if (bn_add_words(r_d, r_d, t_d, BN_NIST_224_TOP))
sl@0: 		++carry;
sl@0: 	nist_set_224(t_d, buf, 13, 12, 11, 10, 9, 8, 7);
sl@0: 	if (bn_sub_words(r_d, r_d, t_d, BN_NIST_224_TOP))
sl@0: 		--carry;
sl@0: 	nist_set_224(t_d, buf, 0, 0, 0, 0, 13, 12, 11);
sl@0: 	if (bn_sub_words(r_d, r_d, t_d, BN_NIST_224_TOP))
sl@0: 		--carry;
sl@0: 
sl@0: 	if (carry > 0)
sl@0: 		while (carry)
sl@0: 			{
sl@0: 			if (bn_sub_words(r_d,r_d,_nist_p_224,BN_NIST_224_TOP))
sl@0: 				--carry;
sl@0: 			}
sl@0: 	else if (carry < 0)
sl@0: 		while (carry)
sl@0: 			{
sl@0: 			if (bn_add_words(r_d,r_d,_nist_p_224,BN_NIST_224_TOP))
sl@0: 				++carry;
sl@0: 			}
sl@0: 
sl@0: 	r->top = BN_NIST_224_TOP;
sl@0: 	bn_correct_top(r);
sl@0: 	if (BN_ucmp(r, field) >= 0)
sl@0: 		{
sl@0: 		bn_sub_words(r_d, r_d, _nist_p_224, BN_NIST_224_TOP);
sl@0: 		bn_correct_top(r);
sl@0: 		}
sl@0: 	bn_check_top(r);
sl@0: 	return 1;
sl@0: #else
sl@0: 	return 0;
sl@0: #endif
sl@0: 	}
sl@0: 
sl@0: #if BN_BITS2 != 64
sl@0: static void _init_256_data(void)
sl@0: 	{
sl@0: 	int	i;
sl@0: 	BN_ULONG *tmp1 = _256_data;
sl@0: 	const BN_ULONG *tmp2 = tmp1;
sl@0: 
sl@0: 	memcpy(tmp1, _nist_p_256, BN_NIST_256_TOP * sizeof(BN_ULONG));
sl@0: 	tmp1 += BN_NIST_256_TOP;
sl@0: 
sl@0: 	for (i=0; i<5; i++)
sl@0: 		{
sl@0: 		bn_add_words(tmp1, _nist_p_256, tmp2, BN_NIST_256_TOP);
sl@0: 		tmp2  = tmp1;
sl@0: 		tmp1 += BN_NIST_256_TOP;
sl@0: 		}
sl@0: 	_is_set_256_data = 1;
sl@0: 	}
sl@0: #endif
sl@0: 
sl@0: #define nist_set_256(to, from, a1, a2, a3, a4, a5, a6, a7, a8) \
sl@0: 	{ \
sl@0: 	if (a8 != 0) bn_cp_32(to, 0, from, (a8) - 8) else bn_32_set_0(to, 0)\
sl@0: 	if (a7 != 0) bn_cp_32(to, 1, from, (a7) - 8) else bn_32_set_0(to, 1)\
sl@0: 	if (a6 != 0) bn_cp_32(to, 2, from, (a6) - 8) else bn_32_set_0(to, 2)\
sl@0: 	if (a5 != 0) bn_cp_32(to, 3, from, (a5) - 8) else bn_32_set_0(to, 3)\
sl@0: 	if (a4 != 0) bn_cp_32(to, 4, from, (a4) - 8) else bn_32_set_0(to, 4)\
sl@0: 	if (a3 != 0) bn_cp_32(to, 5, from, (a3) - 8) else bn_32_set_0(to, 5)\
sl@0: 	if (a2 != 0) bn_cp_32(to, 6, from, (a2) - 8) else bn_32_set_0(to, 6)\
sl@0: 	if (a1 != 0) bn_cp_32(to, 7, from, (a1) - 8) else bn_32_set_0(to, 7)\
sl@0: 	}
sl@0: 
sl@0: EXPORT_C int BN_nist_mod_256(BIGNUM *r, const BIGNUM *a, const BIGNUM *field,
sl@0: 	BN_CTX *ctx)
sl@0: 	{
sl@0: #if BN_BITS2 != 64
sl@0: 	int	i, top = a->top;
sl@0: 	int	carry = 0;
sl@0: 	register BN_ULONG *a_d = a->d, *r_d;
sl@0: 	BN_ULONG t_d[BN_NIST_256_TOP],
sl@0: 	         t_d2[BN_NIST_256_TOP],
sl@0: 	         buf[BN_NIST_256_TOP];
sl@0: 
sl@0: 	if (!_is_set_256_data)
sl@0: 		{
sl@0: 		CRYPTO_w_lock(CRYPTO_LOCK_BN);
sl@0: 		
sl@0: 		if (!_is_set_256_data)
sl@0: 			_init_256_data();
sl@0: 		
sl@0: 		CRYPTO_w_unlock(CRYPTO_LOCK_BN);
sl@0: 		}
sl@0: 	
sl@0: 	i = BN_ucmp(field, a);
sl@0: 	if (i == 0)
sl@0: 		{
sl@0: 		BN_zero(r);
sl@0: 		return 1;
sl@0: 		}
sl@0: 	else if (i > 0)
sl@0: 		return (r == a)? 1 : (BN_copy(r ,a) != NULL);
sl@0: 
sl@0: 	if (top == BN_NIST_256_TOP)
sl@0: 		return BN_usub(r, a, field);
sl@0: 
sl@0: 	if (r != a)
sl@0: 		{
sl@0: 		if (!bn_wexpand(r, BN_NIST_256_TOP))
sl@0: 			return 0;
sl@0: 		r_d = r->d;
sl@0: 		nist_cp_bn(r_d, a_d, BN_NIST_256_TOP);
sl@0: 		}
sl@0: 	else
sl@0: 		r_d = a_d;
sl@0: 
sl@0: 	nist_cp_bn_0(buf, a_d + BN_NIST_256_TOP, top - BN_NIST_256_TOP, BN_NIST_256_TOP);
sl@0: 
sl@0: 	/*S1*/
sl@0: 	nist_set_256(t_d, buf, 15, 14, 13, 12, 11, 0, 0, 0);
sl@0: 	/*S2*/
sl@0: 	nist_set_256(t_d2,buf, 0, 15, 14, 13, 12, 0, 0, 0);
sl@0: 	if (bn_add_words(t_d, t_d, t_d2, BN_NIST_256_TOP))
sl@0: 		carry = 2;
sl@0: 	/* left shift */
sl@0: 		{
sl@0: 		register BN_ULONG *ap,t,c;
sl@0: 		ap = t_d;
sl@0: 		c=0;
sl@0: 		for (i = BN_NIST_256_TOP; i != 0; --i)
sl@0: 			{
sl@0: 			t= *ap;
sl@0: 			*(ap++)=((t<<1)|c)&BN_MASK2;
sl@0: 			c=(t & BN_TBIT)?1:0;
sl@0: 			}
sl@0: 		if (c)
sl@0: 			++carry;
sl@0: 		}
sl@0: 
sl@0: 	if (bn_add_words(r_d, r_d, t_d, BN_NIST_256_TOP))
sl@0: 		++carry;
sl@0: 	/*S3*/
sl@0: 	nist_set_256(t_d, buf, 15, 14, 0, 0, 0, 10, 9, 8);
sl@0: 	if (bn_add_words(r_d, r_d, t_d, BN_NIST_256_TOP))
sl@0: 		++carry;
sl@0: 	/*S4*/
sl@0: 	nist_set_256(t_d, buf, 8, 13, 15, 14, 13, 11, 10, 9);
sl@0: 	if (bn_add_words(r_d, r_d, t_d, BN_NIST_256_TOP))
sl@0: 		++carry;
sl@0: 	/*D1*/
sl@0: 	nist_set_256(t_d, buf, 10, 8, 0, 0, 0, 13, 12, 11);
sl@0: 	if (bn_sub_words(r_d, r_d, t_d, BN_NIST_256_TOP))
sl@0: 		--carry;
sl@0: 	/*D2*/
sl@0: 	nist_set_256(t_d, buf, 11, 9, 0, 0, 15, 14, 13, 12);
sl@0: 	if (bn_sub_words(r_d, r_d, t_d, BN_NIST_256_TOP))
sl@0: 		--carry;
sl@0: 	/*D3*/
sl@0: 	nist_set_256(t_d, buf, 12, 0, 10, 9, 8, 15, 14, 13);
sl@0: 	if (bn_sub_words(r_d, r_d, t_d, BN_NIST_256_TOP))
sl@0: 		--carry;
sl@0: 	/*D4*/
sl@0: 	nist_set_256(t_d, buf, 13, 0, 11, 10, 9, 0, 15, 14);
sl@0: 	if (bn_sub_words(r_d, r_d, t_d, BN_NIST_256_TOP))
sl@0: 		--carry;
sl@0: 	
sl@0: 	if (carry)
sl@0: 		{
sl@0: 		if (carry > 0)
sl@0: 			bn_sub_words(r_d, r_d, _256_data + BN_NIST_256_TOP *
sl@0: 				--carry, BN_NIST_256_TOP);
sl@0: 		else
sl@0: 			{
sl@0: 			carry = -carry;
sl@0: 			bn_add_words(r_d, r_d, _256_data + BN_NIST_256_TOP *
sl@0: 				--carry, BN_NIST_256_TOP);
sl@0: 			}
sl@0: 		}
sl@0: 
sl@0: 	r->top = BN_NIST_256_TOP;
sl@0: 	bn_correct_top(r);
sl@0: 	if (BN_ucmp(r, field) >= 0)
sl@0: 		{
sl@0: 		bn_sub_words(r_d, r_d, _nist_p_256, BN_NIST_256_TOP);
sl@0: 		bn_correct_top(r);
sl@0: 		}
sl@0: 	bn_check_top(r);
sl@0: 	return 1;
sl@0: #else
sl@0: 	return 0;
sl@0: #endif
sl@0: 	}
sl@0: 
sl@0: #if BN_BITS2 != 64
sl@0: static void _init_384_data(void)
sl@0: 	{
sl@0: 	int	i;
sl@0: 	BN_ULONG *tmp1 = _384_data;
sl@0: 	const BN_ULONG *tmp2 = tmp1;
sl@0: 
sl@0: 	memcpy(tmp1, _nist_p_384, BN_NIST_384_TOP * sizeof(BN_ULONG));
sl@0: 	tmp1 += BN_NIST_384_TOP;
sl@0: 
sl@0: 	for (i=0; i<7; i++)
sl@0: 		{
sl@0: 		bn_add_words(tmp1, _nist_p_384, tmp2, BN_NIST_384_TOP);
sl@0: 		tmp2  = tmp1;
sl@0: 		tmp1 += BN_NIST_384_TOP;
sl@0: 		}
sl@0: 	_is_set_384_data = 1;
sl@0: 	}
sl@0: #endif
sl@0: 
sl@0: #define nist_set_384(to,from,a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12) \
sl@0: 	{ \
sl@0: 	if (a12 != 0) bn_cp_32(to, 0, from,  (a12) - 12) else bn_32_set_0(to, 0)\
sl@0: 	if (a11 != 0) bn_cp_32(to, 1, from,  (a11) - 12) else bn_32_set_0(to, 1)\
sl@0: 	if (a10 != 0) bn_cp_32(to, 2, from,  (a10) - 12) else bn_32_set_0(to, 2)\
sl@0: 	if (a9 != 0)  bn_cp_32(to, 3, from,  (a9) - 12)  else bn_32_set_0(to, 3)\
sl@0: 	if (a8 != 0)  bn_cp_32(to, 4, from,  (a8) - 12)  else bn_32_set_0(to, 4)\
sl@0: 	if (a7 != 0)  bn_cp_32(to, 5, from,  (a7) - 12)  else bn_32_set_0(to, 5)\
sl@0: 	if (a6 != 0)  bn_cp_32(to, 6, from,  (a6) - 12)  else bn_32_set_0(to, 6)\
sl@0: 	if (a5 != 0)  bn_cp_32(to, 7, from,  (a5) - 12)  else bn_32_set_0(to, 7)\
sl@0: 	if (a4 != 0)  bn_cp_32(to, 8, from,  (a4) - 12)  else bn_32_set_0(to, 8)\
sl@0: 	if (a3 != 0)  bn_cp_32(to, 9, from,  (a3) - 12)  else bn_32_set_0(to, 9)\
sl@0: 	if (a2 != 0)  bn_cp_32(to, 10, from, (a2) - 12)  else bn_32_set_0(to, 10)\
sl@0: 	if (a1 != 0)  bn_cp_32(to, 11, from, (a1) - 12)  else bn_32_set_0(to, 11)\
sl@0: 	}
sl@0: 
sl@0: EXPORT_C int BN_nist_mod_384(BIGNUM *r, const BIGNUM *a, const BIGNUM *field,
sl@0: 	BN_CTX *ctx)
sl@0: 	{
sl@0: #if BN_BITS2 != 64
sl@0: 	int	i, top = a->top;
sl@0: 	int	carry = 0;
sl@0: 	register BN_ULONG *r_d, *a_d = a->d;
sl@0: 	BN_ULONG t_d[BN_NIST_384_TOP],
sl@0: 	         buf[BN_NIST_384_TOP];
sl@0: 
sl@0: 	if (!_is_set_384_data)
sl@0: 		{
sl@0: 		CRYPTO_w_lock(CRYPTO_LOCK_BN);
sl@0: 		
sl@0: 		if (!_is_set_384_data)
sl@0: 			_init_384_data();
sl@0: 
sl@0: 		CRYPTO_w_unlock(CRYPTO_LOCK_BN);
sl@0: 		}
sl@0: 
sl@0: 	i = BN_ucmp(field, a);
sl@0: 	if (i == 0)
sl@0: 		{
sl@0: 		BN_zero(r);
sl@0: 		return 1;
sl@0: 		}
sl@0: 	else if (i > 0)
sl@0: 		return (r == a)? 1 : (BN_copy(r ,a) != NULL);
sl@0: 
sl@0: 	if (top == BN_NIST_384_TOP)
sl@0: 		return BN_usub(r, a, field);
sl@0: 
sl@0: 	if (r != a)
sl@0: 		{
sl@0: 		if (!bn_wexpand(r, BN_NIST_384_TOP))
sl@0: 			return 0;
sl@0: 		r_d = r->d;
sl@0: 		nist_cp_bn(r_d, a_d, BN_NIST_384_TOP);
sl@0: 		}
sl@0: 	else
sl@0: 		r_d = a_d;
sl@0: 
sl@0: 	nist_cp_bn_0(buf, a_d + BN_NIST_384_TOP, top - BN_NIST_384_TOP, BN_NIST_384_TOP);
sl@0: 
sl@0: 	/*S1*/
sl@0: 	nist_set_256(t_d, buf, 0, 0, 0, 0, 0, 23-4, 22-4, 21-4);
sl@0: 		/* left shift */
sl@0: 		{
sl@0: 		register BN_ULONG *ap,t,c;
sl@0: 		ap = t_d;
sl@0: 		c=0;
sl@0: 		for (i = BN_NIST_256_TOP; i != 0; --i)
sl@0: 			{
sl@0: 			t= *ap;
sl@0: 			*(ap++)=((t<<1)|c)&BN_MASK2;
sl@0: 			c=(t & BN_TBIT)?1:0;
sl@0: 			}
sl@0: 		}
sl@0: 	if (bn_add_words(r_d+(128/BN_BITS2), r_d+(128/BN_BITS2), 
sl@0: 		t_d, BN_NIST_256_TOP))
sl@0: 		++carry;
sl@0: 	/*S2 */
sl@0: 	if (bn_add_words(r_d, r_d, buf, BN_NIST_384_TOP))
sl@0: 		++carry;
sl@0: 	/*S3*/
sl@0: 	nist_set_384(t_d,buf,20,19,18,17,16,15,14,13,12,23,22,21);
sl@0: 	if (bn_add_words(r_d, r_d, t_d, BN_NIST_384_TOP))
sl@0: 		++carry;
sl@0: 	/*S4*/
sl@0: 	nist_set_384(t_d,buf,19,18,17,16,15,14,13,12,20,0,23,0);
sl@0: 	if (bn_add_words(r_d, r_d, t_d, BN_NIST_384_TOP))
sl@0: 		++carry;
sl@0: 	/*S5*/
sl@0: 	nist_set_256(t_d, buf, 0, 0, 0, 0, 23-4, 22-4, 21-4, 20-4);
sl@0: 	if (bn_add_words(r_d+(128/BN_BITS2), r_d+(128/BN_BITS2), 
sl@0: 		t_d, BN_NIST_256_TOP))
sl@0: 		++carry;
sl@0: 	/*S6*/
sl@0: 	nist_set_384(t_d,buf,0,0,0,0,0,0,23,22,21,0,0,20);
sl@0: 	if (bn_add_words(r_d, r_d, t_d, BN_NIST_384_TOP))
sl@0: 		++carry;
sl@0: 	/*D1*/
sl@0: 	nist_set_384(t_d,buf,22,21,20,19,18,17,16,15,14,13,12,23);
sl@0: 	if (bn_sub_words(r_d, r_d, t_d, BN_NIST_384_TOP))
sl@0: 		--carry;
sl@0: 	/*D2*/
sl@0: 	nist_set_384(t_d,buf,0,0,0,0,0,0,0,23,22,21,20,0);
sl@0: 	if (bn_sub_words(r_d, r_d, t_d, BN_NIST_384_TOP))
sl@0: 		--carry;
sl@0: 	/*D3*/
sl@0: 	nist_set_384(t_d,buf,0,0,0,0,0,0,0,23,23,0,0,0);
sl@0: 	if (bn_sub_words(r_d, r_d, t_d, BN_NIST_384_TOP))
sl@0: 		--carry;
sl@0: 	
sl@0: 	if (carry)
sl@0: 		{
sl@0: 		if (carry > 0)
sl@0: 			bn_sub_words(r_d, r_d, _384_data + BN_NIST_384_TOP *
sl@0: 				--carry, BN_NIST_384_TOP);
sl@0: 		else
sl@0: 			{
sl@0: 			carry = -carry;
sl@0: 			bn_add_words(r_d, r_d, _384_data + BN_NIST_384_TOP *
sl@0: 				--carry, BN_NIST_384_TOP);
sl@0: 			}
sl@0: 		}
sl@0: 
sl@0: 	r->top = BN_NIST_384_TOP;
sl@0: 	bn_correct_top(r);
sl@0: 	if (BN_ucmp(r, field) >= 0)
sl@0: 		{
sl@0: 		bn_sub_words(r_d, r_d, _nist_p_384, BN_NIST_384_TOP);
sl@0: 		bn_correct_top(r);
sl@0: 		}
sl@0: 	bn_check_top(r);
sl@0: 	return 1;
sl@0: #else
sl@0: 	return 0;
sl@0: #endif
sl@0: 	}
sl@0: 
sl@0: EXPORT_C int BN_nist_mod_521(BIGNUM *r, const BIGNUM *a, const BIGNUM *field,
sl@0: 	BN_CTX *ctx)
sl@0: 	{
sl@0: #if BN_BITS2 == 64
sl@0: #define BN_NIST_521_TOP_MASK	(BN_ULONG)0x1FF
sl@0: #elif BN_BITS2 == 32
sl@0: #define BN_NIST_521_TOP_MASK	(BN_ULONG)0x1FF
sl@0: #elif BN_BITS2 == 16
sl@0: #define BN_NIST_521_TOP_MASK	(BN_ULONG)0x1FF
sl@0: #elif BN_BITS2 == 8
sl@0: #define BN_NIST_521_TOP_MASK	(BN_ULONG)0x1
sl@0: #endif
sl@0: 	int	top, ret = 0;
sl@0: 	BN_ULONG *r_d;
sl@0: 	BIGNUM	*tmp;
sl@0: 
sl@0: 	/* check whether a reduction is necessary */
sl@0: 	top = a->top;
sl@0: 	if (top < BN_NIST_521_TOP  || ( top == BN_NIST_521_TOP &&
sl@0:            (!(a->d[BN_NIST_521_TOP-1] & ~(BN_NIST_521_TOP_MASK)))))
sl@0: 		return (r == a)? 1 : (BN_copy(r ,a) != NULL);
sl@0: 
sl@0: 	BN_CTX_start(ctx);
sl@0: 	tmp = BN_CTX_get(ctx);
sl@0: 	if (!tmp)
sl@0: 		goto err;
sl@0: 
sl@0: 	if (!bn_wexpand(tmp, BN_NIST_521_TOP))
sl@0: 		goto err;
sl@0: 	nist_cp_bn(tmp->d, a->d, BN_NIST_521_TOP);
sl@0: 
sl@0: 	tmp->top = BN_NIST_521_TOP;
sl@0:         tmp->d[BN_NIST_521_TOP-1]  &= BN_NIST_521_TOP_MASK;
sl@0: 	bn_correct_top(tmp);
sl@0: 
sl@0: 	if (!BN_rshift(r, a, 521))
sl@0: 		goto err;
sl@0: 
sl@0: 	if (!BN_uadd(r, tmp, r))
sl@0: 		goto err;
sl@0: 	top = r->top;
sl@0: 	r_d = r->d;
sl@0: 	if (top == BN_NIST_521_TOP  && 
sl@0:            (r_d[BN_NIST_521_TOP-1] & ~(BN_NIST_521_TOP_MASK)))
sl@0: 		{
sl@0: 		BN_NIST_ADD_ONE(r_d)
sl@0: 		r_d[BN_NIST_521_TOP-1] &= BN_NIST_521_TOP_MASK; 
sl@0: 		}
sl@0: 	bn_correct_top(r);
sl@0: 
sl@0: 	ret = 1;
sl@0: err:
sl@0: 	BN_CTX_end(ctx);
sl@0: 
sl@0: 	bn_check_top(r);
sl@0: 	return ret;
sl@0: 	}