[apple/security.git] / libsecurity_apple_csp / open_ssl / bn / bn_shift.c

/*
 * Copyright (c) 2000-2001 Apple Computer, Inc. All Rights Reserved.
 * 
 * The contents of this file constitute Original Code as defined in and are
 * subject to the Apple Public Source License Version 1.2 (the 'License').
 * You may not use this file except in compliance with the License. Please obtain
 * a copy of the License at http://www.apple.com/publicsource and read it before
 * using this file.
 * 
 * This Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS
 * OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, INCLUDING WITHOUT
 * LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
 * PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. Please see the License for the
 * specific language governing rights and limitations under the License.
 */


/* crypto/bn/bn_shift.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * 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.]
 */

#include <stdio.h>
#include "cryptlib.h"
#include "bn_lcl.h"

int BN_lshift1(BIGNUM *r, BIGNUM *a)
	{
	register BN_ULONG *ap,*rp,t,c;
	int i;

	if (r != a)
		{
		r->neg=a->neg;
		if (bn_wexpand(r,a->top+1) == NULL) return(0);
		r->top=a->top;
		}
	else
		{
		if (bn_wexpand(r,a->top+1) == NULL) return(0);
		}
	ap=a->d;
	rp=r->d;
	c=0;
	for (i=0; i<a->top; i++)
		{
		t= *(ap++);
		*(rp++)=((t<<1)|c)&BN_MASK2;
		c=(t & BN_TBIT)?1:0;
		}
	if (c)
		{
		*rp=1;
		r->top++;
		}
	return(1);
	}

int BN_rshift1(BIGNUM *r, BIGNUM *a)
	{
	BN_ULONG *ap,*rp,t,c;
	int i;

	if (BN_is_zero(a))
		{
		BN_zero(r);
		return(1);
		}
	if (a != r)
		{
		if (bn_wexpand(r,a->top) == NULL) return(0);
		r->top=a->top;
		r->neg=a->neg;
		}
	ap=a->d;
	rp=r->d;
	c=0;
	for (i=a->top-1; i>=0; i--)
		{
		t=ap[i];
		rp[i]=((t>>1)&BN_MASK2)|c;
		c=(t&1)?BN_TBIT:0;
		}
	bn_fix_top(r);
	return(1);
	}

int BN_lshift(BIGNUM *r, const BIGNUM *a, int n)
	{
	int i,nw,lb,rb;
	BN_ULONG *t,*f;
	BN_ULONG l;

	r->neg=a->neg;
	if (bn_wexpand(r,a->top+(n/BN_BITS2)+1) == NULL) return(0);
	nw=n/BN_BITS2;
	lb=n%BN_BITS2;
	rb=BN_BITS2-lb;
	f=a->d;
	t=r->d;
	t[a->top+nw]=0;
	if (lb == 0)
		for (i=a->top-1; i>=0; i--)
			t[nw+i]=f[i];
	else
		for (i=a->top-1; i>=0; i--)
			{
			l=f[i];
			t[nw+i+1]|=(l>>rb)&BN_MASK2;
			t[nw+i]=(l<<lb)&BN_MASK2;
			}
	memset(t,0,nw*sizeof(t[0]));
/*	for (i=0; i<nw; i++)
		t[i]=0;*/
	r->top=a->top+nw+1;
	bn_fix_top(r);
	return(1);
	}

int BN_rshift(BIGNUM *r, BIGNUM *a, int n)
	{
	int i,j,nw,lb,rb;
	BN_ULONG *t,*f;
	BN_ULONG l,tmp;

	nw=n/BN_BITS2;
	rb=n%BN_BITS2;
	lb=BN_BITS2-rb;
	if (nw > a->top)
		{
		BN_zero(r);
		return(1);
		}
	if (r != a)
		{
		r->neg=a->neg;
		if (bn_wexpand(r,a->top-nw+1) == NULL) return(0);
		}

	f= &(a->d[nw]);
	t=r->d;
	j=a->top-nw;
	r->top=j;

	if (rb == 0)
		{
		for (i=j+1; i > 0; i--)
			*(t++)= *(f++);
		}
	else
		{
		l= *(f++);
		for (i=1; i<j; i++)
			{
			tmp =(l>>rb)&BN_MASK2;
			l= *(f++);
			*(t++) =(tmp|(l<<lb))&BN_MASK2;
			}
		*(t++) =(l>>rb)&BN_MASK2;
		}
	*t=0;
	bn_fix_top(r);
	return(1);
	}
Commit	Line	Data
b1ab9ed8 A	1	/*
	2	* Copyright (c) 2000-2001 Apple Computer, Inc. All Rights Reserved.
	3	*
	4	* The contents of this file constitute Original Code as defined in and are
	5	* subject to the Apple Public Source License Version 1.2 (the 'License').
	6	* You may not use this file except in compliance with the License. Please obtain
	7	* a copy of the License at http://www.apple.com/publicsource and read it before
	8	* using this file.
	9	*
	10	* This Original Code and all software distributed under the License are
	11	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS
	12	* OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, INCLUDING WITHOUT
	13	* LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
	14	* PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. Please see the License for the
	15	* specific language governing rights and limitations under the License.
	16	*/
	17
	18
	19	/* crypto/bn/bn_shift.c */
	20	/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
	21	* All rights reserved.
	22	*
	23	* This package is an SSL implementation written
	24	* by Eric Young (eay@cryptsoft.com).
	25	* The implementation was written so as to conform with Netscapes SSL.
	26	*
	27	* This library is free for commercial and non-commercial use as long as
	28	* the following conditions are aheared to. The following conditions
	29	* apply to all code found in this distribution, be it the RC4, RSA,
	30	* lhash, DES, etc., code; not just the SSL code. The SSL documentation
	31	* included with this distribution is covered by the same copyright terms
	32	* except that the holder is Tim Hudson (tjh@cryptsoft.com).
	33	*
	34	* Copyright remains Eric Young's, and as such any Copyright notices in
	35	* the code are not to be removed.
	36	* If this package is used in a product, Eric Young should be given attribution
	37	* as the author of the parts of the library used.
	38	* This can be in the form of a textual message at program startup or
	39	* in documentation (online or textual) provided with the package.
	40	*
	41	* Redistribution and use in source and binary forms, with or without
	42	* modification, are permitted provided that the following conditions
	43	* are met:
	44	* 1. Redistributions of source code must retain the copyright
	45	* notice, this list of conditions and the following disclaimer.
	46	* 2. Redistributions in binary form must reproduce the above copyright
	47	* notice, this list of conditions and the following disclaimer in the
	48	* documentation and/or other materials provided with the distribution.
	49	* 3. All advertising materials mentioning features or use of this software
	50	* must display the following acknowledgement:
	51	* "This product includes cryptographic software written by
	52	* Eric Young (eay@cryptsoft.com)"
	53	* The word 'cryptographic' can be left out if the rouines from the library
	54	* being used are not cryptographic related :-).
	55	* 4. If you include any Windows specific code (or a derivative thereof) from
	56	* the apps directory (application code) you must include an acknowledgement:
	57	* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
	58	*
	59	* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
	60	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	61	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	62	* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
	63	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	64	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
65	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
66	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
67	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
68	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
69	* SUCH DAMAGE.
70	*
71	* The licence and distribution terms for any publically available version or
72	* derivative of this code cannot be changed. i.e. this code cannot simply be
73	* copied and put under another distribution licence
74	* [including the GNU Public Licence.]
75	*/
76
77	#include <stdio.h>
78	#include "cryptlib.h"
79	#include "bn_lcl.h"
80
81	int BN_lshift1(BIGNUM r, BIGNUM a)
82	{
83	register BN_ULONG ap,rp,t,c;
84	int i;
85
86	if (r != a)
87	{
88	r->neg=a->neg;
89	if (bn_wexpand(r,a->top+1) == NULL) return(0);
90	r->top=a->top;
91	}
92	else
93	{
94	if (bn_wexpand(r,a->top+1) == NULL) return(0);
95	}
96	ap=a->d;
97	rp=r->d;
98	c=0;
99	for (i=0; i<a->top; i++)
100	{
101	t= *(ap++);
102	*(rp++)=((t<<1)\|c)&BN_MASK2;
103	c=(t & BN_TBIT)?1:0;
104	}
105	if (c)
106	{
107	*rp=1;
108	r->top++;
109	}
110	return(1);
111	}
112
113	int BN_rshift1(BIGNUM r, BIGNUM a)
114	{
115	BN_ULONG ap,rp,t,c;
116	int i;
117
118	if (BN_is_zero(a))
119	{
120	BN_zero(r);
121	return(1);
122	}
123	if (a != r)
124	{
125	if (bn_wexpand(r,a->top) == NULL) return(0);
126	r->top=a->top;
127	r->neg=a->neg;
128	}
129	ap=a->d;
130	rp=r->d;
131	c=0;
132	for (i=a->top-1; i>=0; i--)
133	{
134	t=ap[i];
135	rp[i]=((t>>1)&BN_MASK2)\|c;
136	c=(t&1)?BN_TBIT:0;
137	}
138	bn_fix_top(r);
139	return(1);
140	}
141
142	int BN_lshift(BIGNUM r, const BIGNUM a, int n)
143	{
144	int i,nw,lb,rb;
145	BN_ULONG t,f;
146	BN_ULONG l;
147
148	r->neg=a->neg;
149	if (bn_wexpand(r,a->top+(n/BN_BITS2)+1) == NULL) return(0);
150	nw=n/BN_BITS2;
151	lb=n%BN_BITS2;
152	rb=BN_BITS2-lb;
153	f=a->d;
154	t=r->d;
155	t[a->top+nw]=0;
156	if (lb == 0)
157	for (i=a->top-1; i>=0; i--)
158	t[nw+i]=f[i];
159	else
160	for (i=a->top-1; i>=0; i--)
161	{
162	l=f[i];
163	t[nw+i+1]\|=(l>>rb)&BN_MASK2;
164	t[nw+i]=(l<<lb)&BN_MASK2;
165	}
166	memset(t,0,nw*sizeof(t[0]));
167	/* for (i=0; i<nw; i++)
168	t[i]=0;*/
169	r->top=a->top+nw+1;
170	bn_fix_top(r);
171	return(1);
172	}
173
174	int BN_rshift(BIGNUM r, BIGNUM a, int n)
175	{
176	int i,j,nw,lb,rb;
177	BN_ULONG t,f;
178	BN_ULONG l,tmp;
179
180	nw=n/BN_BITS2;
181	rb=n%BN_BITS2;
182	lb=BN_BITS2-rb;
183	if (nw > a->top)
184	{
185	BN_zero(r);
186	return(1);
187	}
188	if (r != a)
189	{
190	r->neg=a->neg;
191	if (bn_wexpand(r,a->top-nw+1) == NULL) return(0);
192	}
193
194	f= &(a->d[nw]);
195	t=r->d;
196	j=a->top-nw;
197	r->top=j;
198
199	if (rb == 0)
200	{
201	for (i=j+1; i > 0; i--)
202	(t++)= (f++);
203	}
204	else
205	{
206	l= *(f++);
207	for (i=1; i<j; i++)
208	{
209	tmp =(l>>rb)&BN_MASK2;
210	l= *(f++);
211	*(t++) =(tmp\|(l<<lb))&BN_MASK2;
212	}
213	*(t++) =(l>>rb)&BN_MASK2;
214	}
215	*t=0;
216	bn_fix_top(r);
217	return(1);
218	}