1/*	$NetBSD: sha1.c,v 1.1 2005/12/20 20:29:40 christos Exp $	*/
2/*	$OpenBSD: sha1.c,v 1.9 1997/07/23 21:12:32 kstailey Exp $	*/
3
4/*
5 * SHA-1 in C
6 * By Steve Reid <steve@edmweb.com>
7 * 100% Public Domain
8 *
9 * Test Vectors (from FIPS PUB 180-1)
10 * "abc"
11 *   A9993E36 4706816A BA3E2571 7850C26C 9CD0D89D
12 * "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq"
13 *   84983E44 1C3BD26E BAAE4AA1 F95129E5 E54670F1
14 * A million repetitions of "a"
15 *   34AA973C D4C4DAA4 F61EEB2B DBAD2731 6534016F
16 */
17
18#define SHA1HANDSOFF		/* Copies data before messing with it. */
19
20#include <sys/cdefs.h>
21#include <sys/types.h>
22#include <assert.h>
23#include <sha1.h>
24#include <string.h>
25
26#if HAVE_NBTOOL_CONFIG_H
27#include "nbtool_config.h"
28#endif
29
30#if !HAVE_SHA1_H
31
32#define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
33
34/*
35 * blk0() and blk() perform the initial expand.
36 * I got the idea of expanding during the round function from SSLeay
37 */
38#if BYTE_ORDER == LITTLE_ENDIAN
39# define blk0(i) (block->l[i] = (rol(block->l[i],24)&0xFF00FF00) \
40    |(rol(block->l[i],8)&0x00FF00FF))
41#else
42# define blk0(i) block->l[i]
43#endif
44#define blk(i) (block->l[i&15] = rol(block->l[(i+13)&15]^block->l[(i+8)&15] \
45    ^block->l[(i+2)&15]^block->l[i&15],1))
46
47/*
48 * (R0+R1), R2, R3, R4 are the different operations (rounds) used in SHA1
49 */
50#define R0(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk0(i)+0x5A827999+rol(v,5);w=rol(w,30);
51#define R1(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk(i)+0x5A827999+rol(v,5);w=rol(w,30);
52#define R2(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0x6ED9EBA1+rol(v,5);w=rol(w,30);
53#define R3(v,w,x,y,z,i) z+=(((w|x)&y)|(w&x))+blk(i)+0x8F1BBCDC+rol(v,5);w=rol(w,30);
54#define R4(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0xCA62C1D6+rol(v,5);w=rol(w,30);
55
56typedef union {
57    u_char c[64];
58    u_int l[16];
59} CHAR64LONG16;
60
61/* old sparc64 gcc could not compile this */
62#undef SPARC64_GCC_WORKAROUND
63#if defined(__sparc64__) && defined(__GNUC__) && __GNUC__ < 3
64#define SPARC64_GCC_WORKAROUND
65#endif
66
67#ifdef SPARC64_GCC_WORKAROUND
68void do_R01(u_int32_t *a, u_int32_t *b, u_int32_t *c, u_int32_t *d, u_int32_t *e, CHAR64LONG16 *);
69void do_R2(u_int32_t *a, u_int32_t *b, u_int32_t *c, u_int32_t *d, u_int32_t *e, CHAR64LONG16 *);
70void do_R3(u_int32_t *a, u_int32_t *b, u_int32_t *c, u_int32_t *d, u_int32_t *e, CHAR64LONG16 *);
71void do_R4(u_int32_t *a, u_int32_t *b, u_int32_t *c, u_int32_t *d, u_int32_t *e, CHAR64LONG16 *);
72
73#define nR0(v,w,x,y,z,i) R0(*v,*w,*x,*y,*z,i)
74#define nR1(v,w,x,y,z,i) R1(*v,*w,*x,*y,*z,i)
75#define nR2(v,w,x,y,z,i) R2(*v,*w,*x,*y,*z,i)
76#define nR3(v,w,x,y,z,i) R3(*v,*w,*x,*y,*z,i)
77#define nR4(v,w,x,y,z,i) R4(*v,*w,*x,*y,*z,i)
78
79void
80do_R01(u_int32_t *a, u_int32_t *b, u_int32_t *c, u_int32_t *d, u_int32_t *e, CHAR64LONG16 *block)
81{
82    nR0(a,b,c,d,e, 0); nR0(e,a,b,c,d, 1); nR0(d,e,a,b,c, 2); nR0(c,d,e,a,b, 3);
83    nR0(b,c,d,e,a, 4); nR0(a,b,c,d,e, 5); nR0(e,a,b,c,d, 6); nR0(d,e,a,b,c, 7);
84    nR0(c,d,e,a,b, 8); nR0(b,c,d,e,a, 9); nR0(a,b,c,d,e,10); nR0(e,a,b,c,d,11);
85    nR0(d,e,a,b,c,12); nR0(c,d,e,a,b,13); nR0(b,c,d,e,a,14); nR0(a,b,c,d,e,15);
86    nR1(e,a,b,c,d,16); nR1(d,e,a,b,c,17); nR1(c,d,e,a,b,18); nR1(b,c,d,e,a,19);
87}
88
89void
90do_R2(u_int32_t *a, u_int32_t *b, u_int32_t *c, u_int32_t *d, u_int32_t *e, CHAR64LONG16 *block)
91{
92    nR2(a,b,c,d,e,20); nR2(e,a,b,c,d,21); nR2(d,e,a,b,c,22); nR2(c,d,e,a,b,23);
93    nR2(b,c,d,e,a,24); nR2(a,b,c,d,e,25); nR2(e,a,b,c,d,26); nR2(d,e,a,b,c,27);
94    nR2(c,d,e,a,b,28); nR2(b,c,d,e,a,29); nR2(a,b,c,d,e,30); nR2(e,a,b,c,d,31);
95    nR2(d,e,a,b,c,32); nR2(c,d,e,a,b,33); nR2(b,c,d,e,a,34); nR2(a,b,c,d,e,35);
96    nR2(e,a,b,c,d,36); nR2(d,e,a,b,c,37); nR2(c,d,e,a,b,38); nR2(b,c,d,e,a,39);
97}
98
99void
100do_R3(u_int32_t *a, u_int32_t *b, u_int32_t *c, u_int32_t *d, u_int32_t *e, CHAR64LONG16 *block)
101{
102    nR3(a,b,c,d,e,40); nR3(e,a,b,c,d,41); nR3(d,e,a,b,c,42); nR3(c,d,e,a,b,43);
103    nR3(b,c,d,e,a,44); nR3(a,b,c,d,e,45); nR3(e,a,b,c,d,46); nR3(d,e,a,b,c,47);
104    nR3(c,d,e,a,b,48); nR3(b,c,d,e,a,49); nR3(a,b,c,d,e,50); nR3(e,a,b,c,d,51);
105    nR3(d,e,a,b,c,52); nR3(c,d,e,a,b,53); nR3(b,c,d,e,a,54); nR3(a,b,c,d,e,55);
106    nR3(e,a,b,c,d,56); nR3(d,e,a,b,c,57); nR3(c,d,e,a,b,58); nR3(b,c,d,e,a,59);
107}
108
109void
110do_R4(u_int32_t *a, u_int32_t *b, u_int32_t *c, u_int32_t *d, u_int32_t *e, CHAR64LONG16 *block)
111{
112    nR4(a,b,c,d,e,60); nR4(e,a,b,c,d,61); nR4(d,e,a,b,c,62); nR4(c,d,e,a,b,63);
113    nR4(b,c,d,e,a,64); nR4(a,b,c,d,e,65); nR4(e,a,b,c,d,66); nR4(d,e,a,b,c,67);
114    nR4(c,d,e,a,b,68); nR4(b,c,d,e,a,69); nR4(a,b,c,d,e,70); nR4(e,a,b,c,d,71);
115    nR4(d,e,a,b,c,72); nR4(c,d,e,a,b,73); nR4(b,c,d,e,a,74); nR4(a,b,c,d,e,75);
116    nR4(e,a,b,c,d,76); nR4(d,e,a,b,c,77); nR4(c,d,e,a,b,78); nR4(b,c,d,e,a,79);
117}
118#endif
119
120/*
121 * Hash a single 512-bit block. This is the core of the algorithm.
122 */
123void SHA1Transform(state, buffer)
124    u_int32_t state[5];
125    const u_char buffer[64];
126{
127    u_int32_t a, b, c, d, e;
128    CHAR64LONG16 *block;
129
130#ifdef SHA1HANDSOFF
131    CHAR64LONG16 workspace;
132#endif
133
134    assert(buffer != 0);
135    assert(state != 0);
136
137#ifdef SHA1HANDSOFF
138    block = &workspace;
139    (void)memcpy(block, buffer, 64);
140#else
141    block = (CHAR64LONG16 *)(void *)buffer;
142#endif
143
144    /* Copy context->state[] to working vars */
145    a = state[0];
146    b = state[1];
147    c = state[2];
148    d = state[3];
149    e = state[4];
150
151#ifdef SPARC64_GCC_WORKAROUND
152    do_R01(&a, &b, &c, &d, &e, block);
153    do_R2(&a, &b, &c, &d, &e, block);
154    do_R3(&a, &b, &c, &d, &e, block);
155    do_R4(&a, &b, &c, &d, &e, block);
156#else
157    /* 4 rounds of 20 operations each. Loop unrolled. */
158    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);
159    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);
160    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);
161    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);
162    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);
163    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);
164    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);
165    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);
166    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);
167    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);
168    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);
169    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);
170    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);
171    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);
172    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);
173    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);
174    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);
175    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);
176    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);
177    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);
178#endif
179
180    /* Add the working vars back into context.state[] */
181    state[0] += a;
182    state[1] += b;
183    state[2] += c;
184    state[3] += d;
185    state[4] += e;
186
187    /* Wipe variables */
188    a = b = c = d = e = 0;
189}
190
191
192/*
193 * SHA1Init - Initialize new context
194 */
195void SHA1Init(context)
196    SHA1_CTX *context;
197{
198
199    assert(context != 0);
200
201    /* SHA1 initialization constants */
202    context->state[0] = 0x67452301;
203    context->state[1] = 0xEFCDAB89;
204    context->state[2] = 0x98BADCFE;
205    context->state[3] = 0x10325476;
206    context->state[4] = 0xC3D2E1F0;
207    context->count[0] = context->count[1] = 0;
208}
209
210
211/*
212 * Run your data through this.
213 */
214void SHA1Update(context, data, len)
215    SHA1_CTX *context;
216    const u_char *data;
217    u_int len;
218{
219    u_int i, j;
220
221    assert(context != 0);
222    assert(data != 0);
223
224    j = context->count[0];
225    if ((context->count[0] += len << 3) < j)
226	context->count[1] += (len>>29)+1;
227    j = (j >> 3) & 63;
228    if ((j + len) > 63) {
229	(void)memcpy(&context->buffer[j], data, (i = 64-j));
230	SHA1Transform(context->state, context->buffer);
231	for ( ; i + 63 < len; i += 64)
232	    SHA1Transform(context->state, &data[i]);
233	j = 0;
234    } else {
235	i = 0;
236    }
237    (void)memcpy(&context->buffer[j], &data[i], len - i);
238}
239
240
241/*
242 * Add padding and return the message digest.
243 */
244void SHA1Final(digest, context)
245    u_char digest[20];
246    SHA1_CTX* context;
247{
248    u_int i;
249    u_char finalcount[8];
250
251    assert(digest != 0);
252    assert(context != 0);
253
254    for (i = 0; i < 8; i++) {
255	finalcount[i] = (u_char)((context->count[(i >= 4 ? 0 : 1)]
256	 >> ((3-(i & 3)) * 8) ) & 255);	 /* Endian independent */
257    }
258    SHA1Update(context, (const u_char *)"\200", 1);
259    while ((context->count[0] & 504) != 448)
260	SHA1Update(context, (const u_char *)"\0", 1);
261    SHA1Update(context, finalcount, 8);  /* Should cause a SHA1Transform() */
262
263    if (digest) {
264	for (i = 0; i < 20; i++)
265	    digest[i] = (u_char)
266		((context->state[i>>2] >> ((3-(i & 3)) * 8) ) & 255);
267    }
268}
269
270#endif /* HAVE_SHA1_H */
271