sha1.c revision 269257 
1/*
2 * modified for ldns by Jelte Jansen, original taken from OpenBSD:
3 *
4 * SHA-1 in C
5 * By Steve Reid <steve@edmweb.com>
6 * 100% Public Domain
7 *
8 * Test Vectors (from FIPS PUB 180-1)
9 * "abc"
10 *   A9993E36 4706816A BA3E2571 7850C26C 9CD0D89D
11 * "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq"
12 *   84983E44 1C3BD26E BAAE4AA1 F95129E5 E54670F1
13 * A million repetitions of "a"
14 *   34AA973C D4C4DAA4 F61EEB2B DBAD2731 6534016F
15*/
16
17/* #define LITTLE_ENDIAN * This should be #define'd already, if true. */
18
19#include <ldns/config.h>
20#include <ldns/ldns.h>
21#include <strings.h>
22
23#define SHA1HANDSOFF 1 /* Copies data before messing with it. */
24#define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
25
26/* blk0() and blk() perform the initial expand. */
27/* I got the idea of expanding during the round function from SSLeay */
28#if BYTE_ORDER == LITTLE_ENDIAN
29#define blk0(i) (block->l[i] = (rol(block->l[i],24)&0xFF00FF00) \
30    |(rol(block->l[i],8)&0x00FF00FF))
31#else
32#define blk0(i) block->l[i]
33#endif
34#define blk(i) (block->l[i&15] = rol(block->l[(i+13)&15]^block->l[(i+8)&15] \
35    ^block->l[(i+2)&15]^block->l[i&15],1))
36
37/* (R0+R1), R2, R3, R4 are the different operations used in SHA1 */
38#define R0(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk0(i)+0x5A827999+rol(v,5);w=rol(w,30);
39#define R1(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk(i)+0x5A827999+rol(v,5);w=rol(w,30);
40#define R2(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0x6ED9EBA1+rol(v,5);w=rol(w,30);
41#define R3(v,w,x,y,z,i) z+=(((w|x)&y)|(w&x))+blk(i)+0x8F1BBCDC+rol(v,5);w=rol(w,30);
42#define R4(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0xCA62C1D6+rol(v,5);w=rol(w,30);
43
44/* Hash a single 512-bit block. This is the core of the algorithm. */
45
46void
47ldns_sha1_transform(uint32_t state[5], const unsigned char buffer[LDNS_SHA1_BLOCK_LENGTH])
48{
49    uint32_t a, b, c, d, e;
50    typedef union {
51        unsigned char c[64];
52        unsigned int l[16];
53    } CHAR64LONG16;
54    CHAR64LONG16* block;
55#ifdef SHA1HANDSOFF
56    unsigned char workspace[LDNS_SHA1_BLOCK_LENGTH];
57
58    block = (CHAR64LONG16 *)workspace;
59    memmove(block, buffer, LDNS_SHA1_BLOCK_LENGTH);
60#else
61    block = (CHAR64LONG16 *)buffer;
62#endif
63    /* Copy context->state[] to working vars */
64    a = state[0];
65    b = state[1];
66    c = state[2];
67    d = state[3];
68    e = state[4];
69
70    /* 4 rounds of 20 operations each. Loop unrolled. */
71    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);
72    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);
73    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);
74    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);
75    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);
76    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);
77    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);
78    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);
79    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);
80    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);
81    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);
82    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);
83    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);
84    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);
85    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);
86    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);
87    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);
88    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);
89    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);
90    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);
91
92    /* Add the working vars back into context.state[] */
93    state[0] += a;
94    state[1] += b;
95    state[2] += c;
96    state[3] += d;
97    state[4] += e;
98    /* Wipe variables */
99    a = b = c = d = e = 0;
100}
101
102
103/* SHA1Init - Initialize new context */
104
105void
106ldns_sha1_init(ldns_sha1_ctx *context)
107{
108    /* SHA1 initialization constants */
109    context->count = 0;
110    context->state[0] = 0x67452301;
111    context->state[1] = 0xEFCDAB89;
112    context->state[2] = 0x98BADCFE;
113    context->state[3] = 0x10325476;
114    context->state[4] = 0xC3D2E1F0;
115}
116
117
118/* Run your data through this. */
119
120void
121ldns_sha1_update(ldns_sha1_ctx *context, const unsigned char *data, unsigned int len)
122{
123    unsigned int i;
124    unsigned int j;
125
126    j = (unsigned)(uint32_t)((context->count >> 3) & 63);
127    context->count += (len << 3);
128    if ((j + len) > 63) {
129        memmove(&context->buffer[j], data, (i = 64 - j));
130        ldns_sha1_transform(context->state, context->buffer);
131        for ( ; i + 63 < len; i += 64) {
132            ldns_sha1_transform(context->state, &data[i]);
133        }
134        j = 0;
135    }
136    else i = 0;
137    memmove(&context->buffer[j], &data[i], len - i);
138}
139
140
141/* Add padding and return the message digest. */
142
143void
144ldns_sha1_final(unsigned char digest[LDNS_SHA1_DIGEST_LENGTH], ldns_sha1_ctx *context)
145{
146    unsigned int i;
147    unsigned char finalcount[8];
148
149    for (i = 0; i < 8; i++) {
150        finalcount[i] = (unsigned char)((context->count >>
151            ((7 - (i & 7)) * 8)) & 255);  /* Endian independent */
152    }
153    ldns_sha1_update(context, (unsigned char *)"\200", 1);
154    while ((context->count & 504) != 448) {
155        ldns_sha1_update(context, (unsigned char *)"\0", 1);
156    }
157    ldns_sha1_update(context, finalcount, 8);  /* Should cause a SHA1Transform() */
158
159    if (digest != NULL)
160        for (i = 0; i < LDNS_SHA1_DIGEST_LENGTH; i++) {
161            digest[i] = (unsigned char)((context->state[i >> 2] >>
162                ((3 - (i & 3)) * 8)) & 255);
163      }
164#ifdef SHA1HANDSOFF  /* make SHA1Transform overwrite its own static vars */
165    ldns_sha1_transform(context->state, context->buffer);
166#endif
167}
168
169unsigned char *
170ldns_sha1(unsigned char *data, unsigned int data_len, unsigned char *digest)
171{
172    ldns_sha1_ctx ctx;
173    ldns_sha1_init(&ctx);
174    ldns_sha1_update(&ctx, data, data_len);
175    ldns_sha1_final(digest, &ctx);
176    return digest;
177}
178