bsd/dev/random/YarrowCoreLib/src/sha1mod.c

   1 /*
   2  * Copyright (c) 1999, 2000-2001 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25
  26 /*
  27 SHA-1 in C
  28 By Steve Reid <steve@edmweb.com>
  29 100% Public Domain
  30 */
  31 /* Header portion split from main code for convenience (AYB 3/02/98) */
  32 #include "sha1mod.h"
  33
  34 #define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
  35
  36 /*
  37  * Apple change...
  38  */
  39 #if     defined(macintosh) || defined (__APPLE__)
  40 #undef LITTLE_ENDIAN
  41 #endif
  42
  43 /* blk0() and blk() perform the initial expand. */
  44 /* I got the idea of expanding during the round function from SSLeay */
  45 #ifdef LITTLE_ENDIAN
  46 #define blk0(i) (block->l[i] = (rol(block->l[i],24)&0xFF00FF00) \
  47     |(rol(block->l[i],8)&0x00FF00FF))
  48 #else
  49 #define blk0(i) block->l[i]
  50 #endif
  51 #define blk(i) (block->l[i&15] = rol(block->l[(i+13)&15]^block->l[(i+8)&15] \
  52     ^block->l[(i+2)&15]^block->l[i&15],1))
  53
  54 /* (R0+R1), R2, R3, R4 are the different operations used in SHA1 */
  55 #define R0(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk0(i)+0x5A827999+rol(v,5);w=rol(w,30);
  56 #define R1(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk(i)+0x5A827999+rol(v,5);w=rol(w,30);
  57 #define R2(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0x6ED9EBA1+rol(v,5);w=rol(w,30);
  58 #define R3(v,w,x,y,z,i) z+=(((w|x)&y)|(w&x))+blk(i)+0x8F1BBCDC+rol(v,5);w=rol(w,30);
  59 #define R4(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0xCA62C1D6+rol(v,5);w=rol(w,30);
  60
  61
  62 /* Hash a single 512-bit block. This is the core of the algorithm. */
  63
  64 void SHA1Transform(unsigned long state[5], unsigned char buffer[64])
  65 {
  66 unsigned long a, b, c, d, e;
  67 typedef union {
  68     unsigned char c[64];
  69     unsigned long l[16];
  70 } CHAR64LONG16;
  71 CHAR64LONG16* block;
  72 #ifdef SHA1HANDSOFF
  73 static unsigned char workspace[64];
  74     block = (CHAR64LONG16*)workspace;
  75     memcpy(block, buffer, 64);
  76 #else
  77     block = (CHAR64LONG16*)buffer;
  78 #endif
  79     /* Copy context->state[] to working vars */
  80     a = state[0];
  81     b = state[1];
  82     c = state[2];
  83     d = state[3];
  84     e = state[4];
  85     /* 4 rounds of 20 operations each. Loop unrolled. */
  86     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);
  87     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);
  88     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);
  89     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);
  90     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);
  91     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);
  92     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);
  93     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);
  94     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);
  95     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);
  96     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);
  97     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);
  98     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);
  99     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);
 100     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);
 101     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);
 102     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);
 103     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);
 104     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);
 105     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);
 106     /* Add the working vars back into context.state[] */
 107     state[0] += a;
 108     state[1] += b;
 109     state[2] += c;
 110     state[3] += d;
 111     state[4] += e;
 112     /* Wipe variables */
 113     a = b = c = d = e = 0;
 114 }
 115
 116
 117 /* SHA1Init - Initialize new context */
 118
 119 void SHA1Init(SHA1_CTX* context)
 120 {
 121     /* SHA1 initialization constants */
 122     context->state[0] = 0x67452301;
 123     context->state[1] = 0xEFCDAB89;
 124     context->state[2] = 0x98BADCFE;
 125     context->state[3] = 0x10325476;
 126     context->state[4] = 0xC3D2E1F0;
 127     context->count[0] = context->count[1] = 0;
 128 }
 129
 130
 131 /* Run your data through this. */
 132
 133 void SHA1Update(SHA1_CTX* context, unsigned char* data, unsigned int len)
 134 {
 135 unsigned int i, j;
 136
 137     j = (context->count[0] >> 3) & 63;
 138     if ((context->count[0] += len << 3) < (len << 3)) context->count[1]++;
 139     context->count[1] += (len >> 29);
 140     if ((j + len) > 63) {
 141         memcpy(&context->buffer[j], data, (i = 64-j));
 142         SHA1Transform(context->state, context->buffer);
 143         for ( ; i + 63 < len; i += 64) {
 144             SHA1Transform(context->state, &data[i]);
 145         }
 146         j = 0;
 147     }
 148     else i = 0;
 149     memcpy(&context->buffer[j], &data[i], len - i);
 150 }
 151
 152
 153 /* Add padding and return the message digest. */
 154
 155 void SHA1Final(unsigned char digest[20], SHA1_CTX* context)
 156 {
 157 unsigned long i, j;
 158 unsigned char finalcount[8];
 159
 160     for (i = 0; i < 8; i++) {
 161         finalcount[i] = (unsigned char)((context->count[(i >= 4 ? 0 : 1)]
 162          >> ((3-(i & 3)) * 8) ) & 255);  /* Endian independent */
 163     }
 164     SHA1Update(context, (unsigned char *)"\200", 1);
 165     while ((context->count[0] & 504) != 448) {
 166         SHA1Update(context, (unsigned char *)"\0", 1);
 167     }
 168     SHA1Update(context, finalcount, 8);  /* Should cause a SHA1Transform() */
 169     for (i = 0; i < 20; i++) {
 170         digest[i] = (unsigned char)
 171          ((context->state[i>>2] >> ((3-(i & 3)) * 8) ) & 255);
 172     }
 173     /* Wipe variables */
 174     i = j = 0;
 175     memset(context->buffer, 0, 64);
 176     memset(context->state, 0, 20);
 177     memset(context->count, 0, 8);
 178     memset(finalcount, 0, 8);
 179 #ifdef SHA1HANDSOFF  /* make SHA1Transform overwrite it's own static vars */
 180     SHA1Transform(context->state, context->buffer);
 181 #endif
 182 }
 183
 184
 185 /*************************************************************/
 186
 187 /* Test Code */
 188
 189 #if 0
 190
 191 int main(int argc, char** argv)
 192 {
 193 int i, j;
 194 SHA1_CTX context;
 195 unsigned char digest[20], buffer[16384];
 196 FILE* file;
 197
 198     if (argc > 2) {
 199         puts("Public domain SHA-1 implementation - by Steve Reid <steve@edmweb.com>");
 200         puts("Produces the SHA-1 hash of a file, or stdin if no file is specified.");
 201         exit(0);
 202     }
 203     if (argc < 2) {
 204         file = stdin;
 205     }
 206     else {
 207         if (!(file = fopen(argv[1], "rb"))) {
 208             fputs("Unable to open file.", stderr);
 209             exit(-1);
 210         }
 211     }
 212     SHA1Init(&context);
 213     while (!feof(file)) {  /* note: what if ferror(file) */
 214         i = fread(buffer, 1, 16384, file);
 215         SHA1Update(&context, buffer, i);
 216     }
 217     SHA1Final(digest, &context);
 218     fclose(file);
 219     for (i = 0; i < 5; i++) {
 220         for (j = 0; j < 4; j++) {
 221             printf("%02X", digest[i*4+j]);
 222         }
 223         putchar(' ');
 224     }
 225     putchar('\n');
 226     exit(0);
 227 }
 228
 229 #endif