1/*	$NetBSD: sha1.c,v 1.1.1.1 2009/12/13 16:54:18 kardel Exp $	*/
2
3/*
4 * Copyright (C) 2004, 2005, 2007  Internet Systems Consortium, Inc. ("ISC")
5 * Copyright (C) 2000, 2001, 2003  Internet Software Consortium.
6 *
7 * Permission to use, copy, modify, and/or distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
10 *
11 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
12 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
13 * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
14 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
15 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
16 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
17 * PERFORMANCE OF THIS SOFTWARE.
18 */
19
20/* Id: sha1.c,v 1.18 2007/06/19 23:47:17 tbox Exp */
21
22/*	$NetBSD: sha1.c,v 1.1.1.1 2009/12/13 16:54:18 kardel Exp $	*/
23/*	$OpenBSD: sha1.c,v 1.9 1997/07/23 21:12:32 kstailey Exp $	*/
24
25/*! \file
26 * SHA-1 in C
27 * \author By Steve Reid <steve@edmweb.com>
28 * 100% Public Domain
29 * \verbatim
30 * Test Vectors (from FIPS PUB 180-1)
31 * "abc"
32 *   A9993E36 4706816A BA3E2571 7850C26C 9CD0D89D
33 * "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq"
34 *   84983E44 1C3BD26E BAAE4AA1 F95129E5 E54670F1
35 * A million repetitions of "a"
36 *   34AA973C D4C4DAA4 F61EEB2B DBAD2731 6534016F
37 * \endverbatim
38 */
39
40#include "config.h"
41
42#include <isc/assertions.h>
43#include <isc/sha1.h>
44#include <isc/string.h>
45#include <isc/types.h>
46#include <isc/util.h>
47
48#define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
49
50/*@{*/
51/*!
52 * blk0() and blk() perform the initial expand.
53 * I got the idea of expanding during the round function from SSLeay
54 */
55#if !defined(WORDS_BIGENDIAN)
56# define blk0(i) \
57	(block->l[i] = (rol(block->l[i], 24) & 0xFF00FF00) \
58	 | (rol(block->l[i], 8) & 0x00FF00FF))
59#else
60# define blk0(i) block->l[i]
61#endif
62#define blk(i) \
63	(block->l[i & 15] = rol(block->l[(i + 13) & 15] \
64				^ block->l[(i + 8) & 15] \
65				^ block->l[(i + 2) & 15] \
66				^ block->l[i & 15], 1))
67
68/*@}*/
69/*@{*/
70/*!
71 * (R0+R1), R2, R3, R4 are the different operations (rounds) used in SHA1
72 */
73#define R0(v,w,x,y,z,i) \
74	z += ((w & (x ^ y)) ^ y) + blk0(i) + 0x5A827999 + rol(v, 5); \
75	w = rol(w, 30);
76#define R1(v,w,x,y,z,i) \
77	z += ((w & (x ^ y)) ^ y) + blk(i) + 0x5A827999 + rol(v, 5); \
78	w = rol(w, 30);
79#define R2(v,w,x,y,z,i) \
80	z += (w ^ x ^ y) + blk(i) + 0x6ED9EBA1 + rol(v, 5); \
81	w = rol(w, 30);
82#define R3(v,w,x,y,z,i) \
83	z += (((w | x) & y) | (w & x)) + blk(i) + 0x8F1BBCDC + rol(v, 5); \
84	w = rol(w, 30);
85#define R4(v,w,x,y,z,i) \
86	z += (w ^ x ^ y) + blk(i) + 0xCA62C1D6 + rol(v, 5); \
87	w = rol(w, 30);
88
89/*@}*/
90
91typedef union {
92	unsigned char c[64];
93	unsigned int l[16];
94} CHAR64LONG16;
95
96#ifdef __sparc_v9__
97static void do_R01(isc_uint32_t *a, isc_uint32_t *b, isc_uint32_t *c,
98		   isc_uint32_t *d, isc_uint32_t *e, CHAR64LONG16 *);
99static void do_R2(isc_uint32_t *a, isc_uint32_t *b, isc_uint32_t *c,
100		  isc_uint32_t *d, isc_uint32_t *e, CHAR64LONG16 *);
101static void do_R3(isc_uint32_t *a, isc_uint32_t *b, isc_uint32_t *c,
102		  isc_uint32_t *d, isc_uint32_t *e, CHAR64LONG16 *);
103static void do_R4(isc_uint32_t *a, isc_uint32_t *b, isc_uint32_t *c,
104		  isc_uint32_t *d, isc_uint32_t *e, CHAR64LONG16 *);
105
106#define nR0(v,w,x,y,z,i) R0(*v,*w,*x,*y,*z,i)
107#define nR1(v,w,x,y,z,i) R1(*v,*w,*x,*y,*z,i)
108#define nR2(v,w,x,y,z,i) R2(*v,*w,*x,*y,*z,i)
109#define nR3(v,w,x,y,z,i) R3(*v,*w,*x,*y,*z,i)
110#define nR4(v,w,x,y,z,i) R4(*v,*w,*x,*y,*z,i)
111
112static void
113do_R01(isc_uint32_t *a, isc_uint32_t *b, isc_uint32_t *c, isc_uint32_t *d,
114       isc_uint32_t *e, CHAR64LONG16 *block)
115{
116	nR0(a,b,c,d,e, 0); nR0(e,a,b,c,d, 1); nR0(d,e,a,b,c, 2);
117	nR0(c,d,e,a,b, 3); nR0(b,c,d,e,a, 4); nR0(a,b,c,d,e, 5);
118	nR0(e,a,b,c,d, 6); nR0(d,e,a,b,c, 7); nR0(c,d,e,a,b, 8);
119	nR0(b,c,d,e,a, 9); nR0(a,b,c,d,e,10); nR0(e,a,b,c,d,11);
120	nR0(d,e,a,b,c,12); nR0(c,d,e,a,b,13); nR0(b,c,d,e,a,14);
121	nR0(a,b,c,d,e,15); nR1(e,a,b,c,d,16); nR1(d,e,a,b,c,17);
122	nR1(c,d,e,a,b,18); nR1(b,c,d,e,a,19);
123}
124
125static void
126do_R2(isc_uint32_t *a, isc_uint32_t *b, isc_uint32_t *c, isc_uint32_t *d,
127      isc_uint32_t *e, CHAR64LONG16 *block)
128{
129	nR2(a,b,c,d,e,20); nR2(e,a,b,c,d,21); nR2(d,e,a,b,c,22);
130	nR2(c,d,e,a,b,23); nR2(b,c,d,e,a,24); nR2(a,b,c,d,e,25);
131	nR2(e,a,b,c,d,26); nR2(d,e,a,b,c,27); nR2(c,d,e,a,b,28);
132	nR2(b,c,d,e,a,29); nR2(a,b,c,d,e,30); nR2(e,a,b,c,d,31);
133	nR2(d,e,a,b,c,32); nR2(c,d,e,a,b,33); nR2(b,c,d,e,a,34);
134	nR2(a,b,c,d,e,35); nR2(e,a,b,c,d,36); nR2(d,e,a,b,c,37);
135	nR2(c,d,e,a,b,38); nR2(b,c,d,e,a,39);
136}
137
138static void
139do_R3(isc_uint32_t *a, isc_uint32_t *b, isc_uint32_t *c, isc_uint32_t *d,
140      isc_uint32_t *e, CHAR64LONG16 *block)
141{
142	nR3(a,b,c,d,e,40); nR3(e,a,b,c,d,41); nR3(d,e,a,b,c,42);
143	nR3(c,d,e,a,b,43); nR3(b,c,d,e,a,44); nR3(a,b,c,d,e,45);
144	nR3(e,a,b,c,d,46); nR3(d,e,a,b,c,47); nR3(c,d,e,a,b,48);
145	nR3(b,c,d,e,a,49); nR3(a,b,c,d,e,50); nR3(e,a,b,c,d,51);
146	nR3(d,e,a,b,c,52); nR3(c,d,e,a,b,53); nR3(b,c,d,e,a,54);
147	nR3(a,b,c,d,e,55); nR3(e,a,b,c,d,56); nR3(d,e,a,b,c,57);
148	nR3(c,d,e,a,b,58); nR3(b,c,d,e,a,59);
149}
150
151static void
152do_R4(isc_uint32_t *a, isc_uint32_t *b, isc_uint32_t *c, isc_uint32_t *d,
153      isc_uint32_t *e, CHAR64LONG16 *block)
154{
155	nR4(a,b,c,d,e,60); nR4(e,a,b,c,d,61); nR4(d,e,a,b,c,62);
156	nR4(c,d,e,a,b,63); nR4(b,c,d,e,a,64); nR4(a,b,c,d,e,65);
157	nR4(e,a,b,c,d,66); nR4(d,e,a,b,c,67); nR4(c,d,e,a,b,68);
158	nR4(b,c,d,e,a,69); nR4(a,b,c,d,e,70); nR4(e,a,b,c,d,71);
159	nR4(d,e,a,b,c,72); nR4(c,d,e,a,b,73); nR4(b,c,d,e,a,74);
160	nR4(a,b,c,d,e,75); nR4(e,a,b,c,d,76); nR4(d,e,a,b,c,77);
161	nR4(c,d,e,a,b,78); nR4(b,c,d,e,a,79);
162}
163#endif
164
165/*!
166 * Hash a single 512-bit block. This is the core of the algorithm.
167 */
168static void
169transform(isc_uint32_t state[5], const unsigned char buffer[64]) {
170	isc_uint32_t a, b, c, d, e;
171	CHAR64LONG16 *block;
172	CHAR64LONG16 workspace;
173
174	INSIST(buffer != NULL);
175	INSIST(state != NULL);
176
177	block = &workspace;
178	(void)memcpy(block, buffer, 64);
179
180	/* Copy context->state[] to working vars */
181	a = state[0];
182	b = state[1];
183	c = state[2];
184	d = state[3];
185	e = state[4];
186
187#ifdef __sparc_v9__
188	do_R01(&a, &b, &c, &d, &e, block);
189	do_R2(&a, &b, &c, &d, &e, block);
190	do_R3(&a, &b, &c, &d, &e, block);
191	do_R4(&a, &b, &c, &d, &e, block);
192#else
193	/* 4 rounds of 20 operations each. Loop unrolled. */
194	R0(a,b,c,d,e, 0); R0(e,a,b,c,d, 1); R0(d,e,a,b,c, 2); R0(c,d,e,a,b, 3);
195	R0(b,c,d,e,a, 4); R0(a,b,c,d,e, 5); R0(e,a,b,c,d, 6); R0(d,e,a,b,c, 7);
196	R0(c,d,e,a,b, 8); R0(b,c,d,e,a, 9); R0(a,b,c,d,e,10); R0(e,a,b,c,d,11);
197	R0(d,e,a,b,c,12); R0(c,d,e,a,b,13); R0(b,c,d,e,a,14); R0(a,b,c,d,e,15);
198	R1(e,a,b,c,d,16); R1(d,e,a,b,c,17); R1(c,d,e,a,b,18); R1(b,c,d,e,a,19);
199	R2(a,b,c,d,e,20); R2(e,a,b,c,d,21); R2(d,e,a,b,c,22); R2(c,d,e,a,b,23);
200	R2(b,c,d,e,a,24); R2(a,b,c,d,e,25); R2(e,a,b,c,d,26); R2(d,e,a,b,c,27);
201	R2(c,d,e,a,b,28); R2(b,c,d,e,a,29); R2(a,b,c,d,e,30); R2(e,a,b,c,d,31);
202	R2(d,e,a,b,c,32); R2(c,d,e,a,b,33); R2(b,c,d,e,a,34); R2(a,b,c,d,e,35);
203	R2(e,a,b,c,d,36); R2(d,e,a,b,c,37); R2(c,d,e,a,b,38); R2(b,c,d,e,a,39);
204	R3(a,b,c,d,e,40); R3(e,a,b,c,d,41); R3(d,e,a,b,c,42); R3(c,d,e,a,b,43);
205	R3(b,c,d,e,a,44); R3(a,b,c,d,e,45); R3(e,a,b,c,d,46); R3(d,e,a,b,c,47);
206	R3(c,d,e,a,b,48); R3(b,c,d,e,a,49); R3(a,b,c,d,e,50); R3(e,a,b,c,d,51);
207	R3(d,e,a,b,c,52); R3(c,d,e,a,b,53); R3(b,c,d,e,a,54); R3(a,b,c,d,e,55);
208	R3(e,a,b,c,d,56); R3(d,e,a,b,c,57); R3(c,d,e,a,b,58); R3(b,c,d,e,a,59);
209	R4(a,b,c,d,e,60); R4(e,a,b,c,d,61); R4(d,e,a,b,c,62); R4(c,d,e,a,b,63);
210	R4(b,c,d,e,a,64); R4(a,b,c,d,e,65); R4(e,a,b,c,d,66); R4(d,e,a,b,c,67);
211	R4(c,d,e,a,b,68); R4(b,c,d,e,a,69); R4(a,b,c,d,e,70); R4(e,a,b,c,d,71);
212	R4(d,e,a,b,c,72); R4(c,d,e,a,b,73); R4(b,c,d,e,a,74); R4(a,b,c,d,e,75);
213	R4(e,a,b,c,d,76); R4(d,e,a,b,c,77); R4(c,d,e,a,b,78); R4(b,c,d,e,a,79);
214#endif
215
216	/* Add the working vars back into context.state[] */
217	state[0] += a;
218	state[1] += b;
219	state[2] += c;
220	state[3] += d;
221	state[4] += e;
222
223	/* Wipe variables */
224	a = b = c = d = e = 0;
225}
226
227
228/*!
229 * isc_sha1_init - Initialize new context
230 */
231void
232isc_sha1_init(isc_sha1_t *context)
233{
234	INSIST(context != NULL);
235
236	/* SHA1 initialization constants */
237	context->state[0] = 0x67452301;
238	context->state[1] = 0xEFCDAB89;
239	context->state[2] = 0x98BADCFE;
240	context->state[3] = 0x10325476;
241	context->state[4] = 0xC3D2E1F0;
242	context->count[0] = 0;
243	context->count[1] = 0;
244}
245
246void
247isc_sha1_invalidate(isc_sha1_t *context) {
248	memset(context, 0, sizeof(isc_sha1_t));
249}
250
251/*!
252 * Run your data through this.
253 */
254void
255isc_sha1_update(isc_sha1_t *context, const unsigned char *data,
256		unsigned int len)
257{
258	unsigned int i, j;
259
260	INSIST(context != 0);
261	INSIST(data != 0);
262
263	j = context->count[0];
264	if ((context->count[0] += len << 3) < j)
265		context->count[1] += (len >> 29) + 1;
266	j = (j >> 3) & 63;
267	if ((j + len) > 63) {
268		(void)memcpy(&context->buffer[j], data, (i = 64 - j));
269		transform(context->state, context->buffer);
270		for (; i + 63 < len; i += 64)
271			transform(context->state, &data[i]);
272		j = 0;
273	} else {
274		i = 0;
275	}
276
277	(void)memcpy(&context->buffer[j], &data[i], len - i);
278}
279
280
281/*!
282 * Add padding and return the message digest.
283 */
284
285static const unsigned char final_200 = 128;
286static const unsigned char final_0 = 0;
287
288void
289isc_sha1_final(isc_sha1_t *context, unsigned char *digest) {
290	unsigned int i;
291	unsigned char finalcount[8];
292
293	INSIST(digest != 0);
294	INSIST(context != 0);
295
296	for (i = 0; i < 8; i++) {
297		/* Endian independent */
298		finalcount[i] = (unsigned char)
299			((context->count[(i >= 4 ? 0 : 1)]
300			  >> ((3 - (i & 3)) * 8)) & 255);
301	}
302
303	isc_sha1_update(context, &final_200, 1);
304	while ((context->count[0] & 504) != 448)
305		isc_sha1_update(context, &final_0, 1);
306	/* The next Update should cause a transform() */
307	isc_sha1_update(context, finalcount, 8);
308
309	if (digest) {
310		for (i = 0; i < 20; i++)
311			digest[i] = (unsigned char)
312				((context->state[i >> 2]
313				  >> ((3 - (i & 3)) * 8)) & 255);
314	}
315
316	memset(context, 0, sizeof(isc_sha1_t));
317}
318