contrib/ldns/sha1.c

   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 /* #define SHA1HANDSOFF * Copies data before messing with it. */
  19
  20 #include <ldns/config.h>
  21 #include <ldns/ldns.h>
  22 #include <strings.h>
  23
  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
  46 void
  47 ldns_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
 105 void
 106 ldns_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
 120 void
 121 ldns_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
 143 void
 144 ldns_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
 169 unsigned char *
 170 ldns_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 }