1 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// 2 // LibSha1 3 // 4 // Implementation of SHA1 hash function. 5 // Original author: Steve Reid <sreid@sea-to-sky.net> 6 // Contributions by: James H. Brown <jbrown@burgoyne.com>, Saul Kravitz <Saul.Kravitz@celera.com>, 7 // and Ralph Giles <giles@ghostscript.com> 8 // Modified by WaterJuice retaining Public Domain license. 9 // 10 // This is free and unencumbered software released into the public domain - June 2013 waterjuice.org 11 // Modified to: 12 // - stop symbols being exported for libselinux shared library - October 2015 13 // Richard Haines <richard_c_haines@btinternet.com> 14 // - Not cast the workspace from a byte array to a CHAR64LONG16 due to alignment isses. 15 // Fixes: 16 // sha1.c:73:33: error: cast from 'uint8_t *' (aka 'unsigned char *') to 'CHAR64LONG16 *' increases required alignment from 1 to 4 [-Werror,-Wcast-align] 17 // CHAR64LONG16* block = (CHAR64LONG16*) workspace; 18 // William Roberts <william.c.roberts@intel.com> 19 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// 20 21 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// 22 // IMPORTS 23 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// 24 25 #include "sha1.h" 26 #include "dso.h" 27 #include <memory.h> 28 29 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// 30 // TYPES 31 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// 32 33 typedef union 34 { 35 uint8_t c [64]; 36 uint32_t l [16]; 37 } CHAR64LONG16; 38 39 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// 40 // INTERNAL FUNCTIONS 41 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// 42 43 #define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits)))) 44 45 // blk0() and blk() perform the initial expand. 46 #define blk0(i) (block->l[i] = (rol(block->l[i],24)&0xFF00FF00) \ 47 |(rol(block->l[i],8)&0x00FF00FF)) 48 49 #define blk(i) (block->l[i&15] = rol(block->l[(i+13)&15]^block->l[(i+8)&15] \ 50 ^block->l[(i+2)&15]^block->l[i&15],1)) 51 52 // (R0+R1), R2, R3, R4 are the different operations used in SHA1 53 #define R0(v,w,x,y,z,i) z += ((w&(x^y))^y) + blk0(i)+ 0x5A827999 + rol(v,5); w=rol(w,30); 54 #define R1(v,w,x,y,z,i) z += ((w&(x^y))^y) + blk(i) + 0x5A827999 + rol(v,5); w=rol(w,30); 55 #define R2(v,w,x,y,z,i) z += (w^x^y) + blk(i) + 0x6ED9EBA1 + rol(v,5); w=rol(w,30); 56 #define R3(v,w,x,y,z,i) z += (((w|x)&y)|(w&x)) + blk(i) + 0x8F1BBCDC + rol(v,5); w=rol(w,30); 57 #define R4(v,w,x,y,z,i) z += (w^x^y) + blk(i) + 0xCA62C1D6 + rol(v,5); w=rol(w,30); 58 59 60 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// 61 // TransformFunction 62 // 63 // Hash a single 512-bit block. This is the core of the algorithm 64 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// 65 static 66 void TransformFunction(uint32_t state[5],const uint8_t buffer[64])67 TransformFunction 68 ( 69 uint32_t state[5], 70 const uint8_t buffer[64] 71 ) 72 { 73 uint32_t a; 74 uint32_t b; 75 uint32_t c; 76 uint32_t d; 77 uint32_t e; 78 CHAR64LONG16 workspace; 79 CHAR64LONG16* block = &workspace; 80 81 memcpy(block, buffer, 64); 82 83 // Copy context->state[] to working vars 84 a = state[0]; 85 b = state[1]; 86 c = state[2]; 87 d = state[3]; 88 e = state[4]; 89 90 // 4 rounds of 20 operations each. Loop unrolled. 91 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); 92 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); 93 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); 94 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); 95 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); 96 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); 97 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); 98 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); 99 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); 100 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); 101 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); 102 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); 103 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); 104 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); 105 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); 106 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); 107 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); 108 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); 109 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); 110 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); 111 112 // Add the working vars back into context.state[] 113 state[0] += a; 114 state[1] += b; 115 state[2] += c; 116 state[3] += d; 117 state[4] += e; 118 } 119 120 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// 121 // PUBLIC FUNCTIONS 122 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// 123 124 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// 125 // Sha1Initialise 126 // 127 // Initialises an SHA1 Context. Use this to initialise/reset a context. 128 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// 129 void hidden Sha1Initialise(Sha1Context * Context)130 Sha1Initialise 131 ( 132 Sha1Context* Context 133 ) 134 { 135 // SHA1 initialization constants 136 Context->State[0] = 0x67452301; 137 Context->State[1] = 0xEFCDAB89; 138 Context->State[2] = 0x98BADCFE; 139 Context->State[3] = 0x10325476; 140 Context->State[4] = 0xC3D2E1F0; 141 Context->Count[0] = 0; 142 Context->Count[1] = 0; 143 } 144 145 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// 146 // Sha1Update 147 // 148 // Adds data to the SHA1 context. This will process the data and update the internal state of the context. Keep on 149 // calling this function until all the data has been added. Then call Sha1Finalise to calculate the hash. 150 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// 151 void hidden Sha1Update(Sha1Context * Context,void * Buffer,uint32_t BufferSize)152 Sha1Update 153 ( 154 Sha1Context* Context, 155 void* Buffer, 156 uint32_t BufferSize 157 ) 158 { 159 uint32_t i; 160 uint32_t j; 161 162 j = (Context->Count[0] >> 3) & 63; 163 if ((Context->Count[0] += BufferSize << 3) < (BufferSize << 3)) 164 { 165 Context->Count[1]++; 166 } 167 168 Context->Count[1] += (BufferSize >> 29); 169 if ((j + BufferSize) > 63) 170 { 171 i = 64 - j; 172 memcpy(&Context->Buffer[j], Buffer, i); 173 TransformFunction(Context->State, Context->Buffer); 174 for (; i + 63 < BufferSize; i += 64) 175 { 176 TransformFunction(Context->State, (uint8_t*)Buffer + i); 177 } 178 j = 0; 179 } 180 else 181 { 182 i = 0; 183 } 184 185 memcpy(&Context->Buffer[j], &((uint8_t*)Buffer)[i], BufferSize - i); 186 } 187 188 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// 189 // Sha1Finalise 190 // 191 // Performs the final calculation of the hash and returns the digest (20 byte buffer containing 160bit hash). After 192 // calling this, Sha1Initialised must be used to reuse the context. 193 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// 194 void hidden Sha1Finalise(Sha1Context * Context,SHA1_HASH * Digest)195 Sha1Finalise 196 ( 197 Sha1Context* Context, 198 SHA1_HASH* Digest 199 ) 200 { 201 uint32_t i; 202 uint8_t finalcount[8]; 203 204 for (i = 0; i < 8; i++) 205 { 206 finalcount[i] = (unsigned char)((Context->Count[(i >= 4 ? 0 : 1)] 207 >> ((3-(i & 3)) * 8) ) & 255); // Endian independent 208 } 209 Sha1Update(Context, (uint8_t*)"\x80", 1); 210 while ((Context->Count[0] & 504) != 448) 211 { 212 Sha1Update(Context, (uint8_t*)"\0", 1); 213 } 214 215 Sha1Update(Context, finalcount, 8); // Should cause a Sha1TransformFunction() 216 for (i = 0; i < SHA1_HASH_SIZE; i++) 217 { 218 Digest->bytes[i] = (uint8_t)((Context->State[i>>2] >> ((3-(i & 3)) * 8) ) & 255); 219 } 220 } 221