package/ead/src/tinysrp/t_sha.c

   1 #include "t_defines.h"
   2 #include "t_sha.h"
   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 WORDS_BIGENDIAN * This should be #define'd if true. */
  19 /* #define SHA1HANDSOFF * Copies data before messing with it. */
  20
  21 #include <stdio.h>
  22 #include <string.h>
  23
  24 static void SHA1Transform(uint32 state[5], const unsigned char buffer[64]);
  25
  26 #define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
  27
  28 /* blk0() and blk() perform the initial expand. */
  29 /* I got the idea of expanding during the round function from SSLeay */
  30 #ifndef WORDS_BIGENDIAN
  31 #define blk0(i) (block->l[i] = (rol(block->l[i],24)&0xFF00FF00) \
  32     |(rol(block->l[i],8)&0x00FF00FF))
  33 #else
  34 #define blk0(i) block->l[i]
  35 #endif
  36 #define blk(i) (block->l[i&15] = rol(block->l[(i+13)&15]^block->l[(i+8)&15] \
  37     ^block->l[(i+2)&15]^block->l[i&15],1))
  38
  39 /* (R0+R1), R2, R3, R4 are the different operations used in SHA1 */
  40 #define R0(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk0(i)+0x5A827999+rol(v,5);w=rol(w,30);
  41 #define R1(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk(i)+0x5A827999+rol(v,5);w=rol(w,30);
  42 #define R2(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0x6ED9EBA1+rol(v,5);w=rol(w,30);
  43 #define R3(v,w,x,y,z,i) z+=(((w|x)&y)|(w&x))+blk(i)+0x8F1BBCDC+rol(v,5);w=rol(w,30);
  44 #define R4(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0xCA62C1D6+rol(v,5);w=rol(w,30);
  45
  46 /* Hash a single 512-bit block. This is the core of the algorithm. */
  47
  48 static void SHA1Transform(uint32 state[5], const unsigned char buffer[64])
  49 {
  50 uint32 a, b, c, d, e;
  51 typedef union {
  52     unsigned char c[64];
  53     uint32 l[16];
  54 } CHAR64LONG16;
  55 CHAR64LONG16* block;
  56 #ifdef SHA1HANDSOFF
  57 static unsigned char workspace[64];
  58     block = (CHAR64LONG16*)workspace;
  59     memcpy(block, buffer, 64);
  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     /* 4 rounds of 20 operations each. Loop unrolled. */
  70     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);
  71     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);
  72     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);
  73     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);
  74     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);
  75     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);
  76     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);
  77     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);
  78     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);
  79     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);
  80     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);
  81     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);
  82     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);
  83     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);
  84     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);
  85     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);
  86     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);
  87     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);
  88     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);
  89     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);
  90     /* Add the working vars back into context.state[] */
  91     state[0] += a;
  92     state[1] += b;
  93     state[2] += c;
  94     state[3] += d;
  95     state[4] += e;
  96     /* Wipe variables */
  97     a = b = c = d = e = 0;
  98 }
  99
 100
 101 /* SHA1Init - Initialize new context */
 102
 103 void SHA1Init(SHA1_CTX* context)
 104 {
 105     /* SHA1 initialization constants */
 106     context->state[0] = 0x67452301;
 107     context->state[1] = 0xEFCDAB89;
 108     context->state[2] = 0x98BADCFE;
 109     context->state[3] = 0x10325476;
 110     context->state[4] = 0xC3D2E1F0;
 111     context->count[0] = context->count[1] = 0;
 112 }
 113
 114
 115 /* Run your data through this. */
 116
 117 void SHA1Update(SHA1_CTX* context, const unsigned char* data, unsigned int len)
 118 {
 119 unsigned int i, j;
 120
 121     j = (context->count[0] >> 3) & 63;
 122     if ((context->count[0] += len << 3) < (len << 3)) context->count[1]++;
 123     context->count[1] += (len >> 29);
 124     if ((j + len) > 63) {
 125         memcpy(&context->buffer[j], data, (i = 64-j));
 126         SHA1Transform(context->state, context->buffer);
 127         for ( ; i + 63 < len; i += 64) {
 128             SHA1Transform(context->state, &data[i]);
 129         }
 130         j = 0;
 131     }
 132     else i = 0;
 133     memcpy(&context->buffer[j], &data[i], len - i);
 134 }
 135
 136
 137 /* Add padding and return the message digest. */
 138
 139 void SHA1Final(unsigned char digest[20], SHA1_CTX* context)
 140 {
 141 uint32 i, j;
 142 unsigned char finalcount[8];
 143
 144     for (i = 0; i < 8; i++) {
 145         finalcount[i] = (unsigned char)((context->count[(i >= 4 ? 0 : 1)]
 146          >> ((3-(i & 3)) * 8) ) & 255);  /* Endian independent */
 147     }
 148     SHA1Update(context, (unsigned char *)"\200", 1);
 149     while ((context->count[0] & 504) != 448) {
 150         SHA1Update(context, (unsigned char *)"\0", 1);
 151     }
 152     SHA1Update(context, finalcount, 8);  /* Should cause a SHA1Transform() */
 153     for (i = 0; i < 20; i++) {
 154         digest[i] = (unsigned char)
 155          ((context->state[i>>2] >> ((3-(i & 3)) * 8) ) & 255);
 156     }
 157     /* Wipe variables */
 158     i = j = 0;
 159     memset(context->buffer, 0, 64);
 160     memset(context->state, 0, 20);
 161     memset(context->count, 0, 8);
 162     memset(&finalcount, 0, 8);
 163 #ifdef SHA1HANDSOFF  /* make SHA1Transform overwrite its own static vars */
 164     SHA1Transform(context->state, context->buffer);
 165 #endif
 166 }