1 //====- SHA1.cpp - Private copy of the SHA1 implementation ---*- C++ -* ======// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // This code is taken from public domain 10 // (http://oauth.googlecode.com/svn/code/c/liboauth/src/sha1.c and 11 // http://cvsweb.netbsd.org/bsdweb.cgi/src/common/lib/libc/hash/sha1/sha1.c?rev=1.6) 12 // and modified by wrapping it in a C++ interface for LLVM, 13 // and removing unnecessary code. 14 // 15 //===----------------------------------------------------------------------===// 16 17 #include "llvm/Support/SHA1.h" 18 #include "llvm/ADT/ArrayRef.h" 19 #include "llvm/Support/Endian.h" 20 #include "llvm/Support/Host.h" 21 using namespace llvm; 22 23 #include <stdint.h> 24 #include <string.h> 25 26 #if defined(BYTE_ORDER) && defined(BIG_ENDIAN) && BYTE_ORDER == BIG_ENDIAN 27 #define SHA_BIG_ENDIAN 28 #endif 29 30 static inline uint32_t rol(uint32_t Number, int Bits) { 31 return (Number << Bits) | (Number >> (32 - Bits)); 32 } 33 34 static inline uint32_t blk0(uint32_t *Buf, int I) { return Buf[I]; } 35 36 static inline uint32_t blk(uint32_t *Buf, int I) { 37 Buf[I & 15] = rol(Buf[(I + 13) & 15] ^ Buf[(I + 8) & 15] ^ Buf[(I + 2) & 15] ^ 38 Buf[I & 15], 39 1); 40 return Buf[I & 15]; 41 } 42 43 static inline void r0(uint32_t &A, uint32_t &B, uint32_t &C, uint32_t &D, 44 uint32_t &E, int I, uint32_t *Buf) { 45 E += ((B & (C ^ D)) ^ D) + blk0(Buf, I) + 0x5A827999 + rol(A, 5); 46 B = rol(B, 30); 47 } 48 49 static inline void r1(uint32_t &A, uint32_t &B, uint32_t &C, uint32_t &D, 50 uint32_t &E, int I, uint32_t *Buf) { 51 E += ((B & (C ^ D)) ^ D) + blk(Buf, I) + 0x5A827999 + rol(A, 5); 52 B = rol(B, 30); 53 } 54 55 static inline void r2(uint32_t &A, uint32_t &B, uint32_t &C, uint32_t &D, 56 uint32_t &E, int I, uint32_t *Buf) { 57 E += (B ^ C ^ D) + blk(Buf, I) + 0x6ED9EBA1 + rol(A, 5); 58 B = rol(B, 30); 59 } 60 61 static inline void r3(uint32_t &A, uint32_t &B, uint32_t &C, uint32_t &D, 62 uint32_t &E, int I, uint32_t *Buf) { 63 E += (((B | C) & D) | (B & C)) + blk(Buf, I) + 0x8F1BBCDC + rol(A, 5); 64 B = rol(B, 30); 65 } 66 67 static inline void r4(uint32_t &A, uint32_t &B, uint32_t &C, uint32_t &D, 68 uint32_t &E, int I, uint32_t *Buf) { 69 E += (B ^ C ^ D) + blk(Buf, I) + 0xCA62C1D6 + rol(A, 5); 70 B = rol(B, 30); 71 } 72 73 /* code */ 74 #define SHA1_K0 0x5a827999 75 #define SHA1_K20 0x6ed9eba1 76 #define SHA1_K40 0x8f1bbcdc 77 #define SHA1_K60 0xca62c1d6 78 79 #define SEED_0 0x67452301 80 #define SEED_1 0xefcdab89 81 #define SEED_2 0x98badcfe 82 #define SEED_3 0x10325476 83 #define SEED_4 0xc3d2e1f0 84 85 void SHA1::init() { 86 InternalState.State[0] = SEED_0; 87 InternalState.State[1] = SEED_1; 88 InternalState.State[2] = SEED_2; 89 InternalState.State[3] = SEED_3; 90 InternalState.State[4] = SEED_4; 91 InternalState.ByteCount = 0; 92 InternalState.BufferOffset = 0; 93 } 94 95 void SHA1::hashBlock() { 96 uint32_t A = InternalState.State[0]; 97 uint32_t B = InternalState.State[1]; 98 uint32_t C = InternalState.State[2]; 99 uint32_t D = InternalState.State[3]; 100 uint32_t E = InternalState.State[4]; 101 102 // 4 rounds of 20 operations each. Loop unrolled. 103 r0(A, B, C, D, E, 0, InternalState.Buffer.L); 104 r0(E, A, B, C, D, 1, InternalState.Buffer.L); 105 r0(D, E, A, B, C, 2, InternalState.Buffer.L); 106 r0(C, D, E, A, B, 3, InternalState.Buffer.L); 107 r0(B, C, D, E, A, 4, InternalState.Buffer.L); 108 r0(A, B, C, D, E, 5, InternalState.Buffer.L); 109 r0(E, A, B, C, D, 6, InternalState.Buffer.L); 110 r0(D, E, A, B, C, 7, InternalState.Buffer.L); 111 r0(C, D, E, A, B, 8, InternalState.Buffer.L); 112 r0(B, C, D, E, A, 9, InternalState.Buffer.L); 113 r0(A, B, C, D, E, 10, InternalState.Buffer.L); 114 r0(E, A, B, C, D, 11, InternalState.Buffer.L); 115 r0(D, E, A, B, C, 12, InternalState.Buffer.L); 116 r0(C, D, E, A, B, 13, InternalState.Buffer.L); 117 r0(B, C, D, E, A, 14, InternalState.Buffer.L); 118 r0(A, B, C, D, E, 15, InternalState.Buffer.L); 119 r1(E, A, B, C, D, 16, InternalState.Buffer.L); 120 r1(D, E, A, B, C, 17, InternalState.Buffer.L); 121 r1(C, D, E, A, B, 18, InternalState.Buffer.L); 122 r1(B, C, D, E, A, 19, InternalState.Buffer.L); 123 124 r2(A, B, C, D, E, 20, InternalState.Buffer.L); 125 r2(E, A, B, C, D, 21, InternalState.Buffer.L); 126 r2(D, E, A, B, C, 22, InternalState.Buffer.L); 127 r2(C, D, E, A, B, 23, InternalState.Buffer.L); 128 r2(B, C, D, E, A, 24, InternalState.Buffer.L); 129 r2(A, B, C, D, E, 25, InternalState.Buffer.L); 130 r2(E, A, B, C, D, 26, InternalState.Buffer.L); 131 r2(D, E, A, B, C, 27, InternalState.Buffer.L); 132 r2(C, D, E, A, B, 28, InternalState.Buffer.L); 133 r2(B, C, D, E, A, 29, InternalState.Buffer.L); 134 r2(A, B, C, D, E, 30, InternalState.Buffer.L); 135 r2(E, A, B, C, D, 31, InternalState.Buffer.L); 136 r2(D, E, A, B, C, 32, InternalState.Buffer.L); 137 r2(C, D, E, A, B, 33, InternalState.Buffer.L); 138 r2(B, C, D, E, A, 34, InternalState.Buffer.L); 139 r2(A, B, C, D, E, 35, InternalState.Buffer.L); 140 r2(E, A, B, C, D, 36, InternalState.Buffer.L); 141 r2(D, E, A, B, C, 37, InternalState.Buffer.L); 142 r2(C, D, E, A, B, 38, InternalState.Buffer.L); 143 r2(B, C, D, E, A, 39, InternalState.Buffer.L); 144 145 r3(A, B, C, D, E, 40, InternalState.Buffer.L); 146 r3(E, A, B, C, D, 41, InternalState.Buffer.L); 147 r3(D, E, A, B, C, 42, InternalState.Buffer.L); 148 r3(C, D, E, A, B, 43, InternalState.Buffer.L); 149 r3(B, C, D, E, A, 44, InternalState.Buffer.L); 150 r3(A, B, C, D, E, 45, InternalState.Buffer.L); 151 r3(E, A, B, C, D, 46, InternalState.Buffer.L); 152 r3(D, E, A, B, C, 47, InternalState.Buffer.L); 153 r3(C, D, E, A, B, 48, InternalState.Buffer.L); 154 r3(B, C, D, E, A, 49, InternalState.Buffer.L); 155 r3(A, B, C, D, E, 50, InternalState.Buffer.L); 156 r3(E, A, B, C, D, 51, InternalState.Buffer.L); 157 r3(D, E, A, B, C, 52, InternalState.Buffer.L); 158 r3(C, D, E, A, B, 53, InternalState.Buffer.L); 159 r3(B, C, D, E, A, 54, InternalState.Buffer.L); 160 r3(A, B, C, D, E, 55, InternalState.Buffer.L); 161 r3(E, A, B, C, D, 56, InternalState.Buffer.L); 162 r3(D, E, A, B, C, 57, InternalState.Buffer.L); 163 r3(C, D, E, A, B, 58, InternalState.Buffer.L); 164 r3(B, C, D, E, A, 59, InternalState.Buffer.L); 165 166 r4(A, B, C, D, E, 60, InternalState.Buffer.L); 167 r4(E, A, B, C, D, 61, InternalState.Buffer.L); 168 r4(D, E, A, B, C, 62, InternalState.Buffer.L); 169 r4(C, D, E, A, B, 63, InternalState.Buffer.L); 170 r4(B, C, D, E, A, 64, InternalState.Buffer.L); 171 r4(A, B, C, D, E, 65, InternalState.Buffer.L); 172 r4(E, A, B, C, D, 66, InternalState.Buffer.L); 173 r4(D, E, A, B, C, 67, InternalState.Buffer.L); 174 r4(C, D, E, A, B, 68, InternalState.Buffer.L); 175 r4(B, C, D, E, A, 69, InternalState.Buffer.L); 176 r4(A, B, C, D, E, 70, InternalState.Buffer.L); 177 r4(E, A, B, C, D, 71, InternalState.Buffer.L); 178 r4(D, E, A, B, C, 72, InternalState.Buffer.L); 179 r4(C, D, E, A, B, 73, InternalState.Buffer.L); 180 r4(B, C, D, E, A, 74, InternalState.Buffer.L); 181 r4(A, B, C, D, E, 75, InternalState.Buffer.L); 182 r4(E, A, B, C, D, 76, InternalState.Buffer.L); 183 r4(D, E, A, B, C, 77, InternalState.Buffer.L); 184 r4(C, D, E, A, B, 78, InternalState.Buffer.L); 185 r4(B, C, D, E, A, 79, InternalState.Buffer.L); 186 187 InternalState.State[0] += A; 188 InternalState.State[1] += B; 189 InternalState.State[2] += C; 190 InternalState.State[3] += D; 191 InternalState.State[4] += E; 192 } 193 194 void SHA1::addUncounted(uint8_t Data) { 195 #ifdef SHA_BIG_ENDIAN 196 InternalState.Buffer.C[InternalState.BufferOffset] = Data; 197 #else 198 InternalState.Buffer.C[InternalState.BufferOffset ^ 3] = Data; 199 #endif 200 201 InternalState.BufferOffset++; 202 if (InternalState.BufferOffset == BLOCK_LENGTH) { 203 hashBlock(); 204 InternalState.BufferOffset = 0; 205 } 206 } 207 208 void SHA1::writebyte(uint8_t Data) { 209 ++InternalState.ByteCount; 210 addUncounted(Data); 211 } 212 213 void SHA1::update(ArrayRef<uint8_t> Data) { 214 InternalState.ByteCount += Data.size(); 215 216 // Finish the current block. 217 if (InternalState.BufferOffset > 0) { 218 const size_t Remainder = std::min<size_t>( 219 Data.size(), BLOCK_LENGTH - InternalState.BufferOffset); 220 for (size_t I = 0; I < Remainder; ++I) 221 addUncounted(Data[I]); 222 Data = Data.drop_front(Remainder); 223 } 224 225 // Fast buffer filling for large inputs. 226 while (Data.size() >= BLOCK_LENGTH) { 227 assert(InternalState.BufferOffset == 0); 228 assert(BLOCK_LENGTH % 4 == 0); 229 constexpr size_t BLOCK_LENGTH_32 = BLOCK_LENGTH / 4; 230 for (size_t I = 0; I < BLOCK_LENGTH_32; ++I) 231 InternalState.Buffer.L[I] = support::endian::read32be(&Data[I * 4]); 232 hashBlock(); 233 Data = Data.drop_front(BLOCK_LENGTH); 234 } 235 236 // Finish the remainder. 237 for (uint8_t C : Data) 238 addUncounted(C); 239 } 240 241 void SHA1::pad() { 242 // Implement SHA-1 padding (fips180-2 5.1.1) 243 244 // Pad with 0x80 followed by 0x00 until the end of the block 245 addUncounted(0x80); 246 while (InternalState.BufferOffset != 56) 247 addUncounted(0x00); 248 249 // Append length in the last 8 bytes 250 addUncounted(0); // We're only using 32 bit lengths 251 addUncounted(0); // But SHA-1 supports 64 bit lengths 252 addUncounted(0); // So zero pad the top bits 253 addUncounted(InternalState.ByteCount >> 29); // Shifting to multiply by 8 254 addUncounted(InternalState.ByteCount >> 255 21); // as SHA-1 supports bitstreams as well as 256 addUncounted(InternalState.ByteCount >> 13); // byte. 257 addUncounted(InternalState.ByteCount >> 5); 258 addUncounted(InternalState.ByteCount << 3); 259 } 260 261 StringRef SHA1::final() { 262 // Pad to complete the last block 263 pad(); 264 265 #ifdef SHA_BIG_ENDIAN 266 // Just copy the current state 267 for (int i = 0; i < 5; i++) { 268 HashResult[i] = InternalState.State[i]; 269 } 270 #else 271 // Swap byte order back 272 for (int i = 0; i < 5; i++) { 273 HashResult[i] = (((InternalState.State[i]) << 24) & 0xff000000) | 274 (((InternalState.State[i]) << 8) & 0x00ff0000) | 275 (((InternalState.State[i]) >> 8) & 0x0000ff00) | 276 (((InternalState.State[i]) >> 24) & 0x000000ff); 277 } 278 #endif 279 280 // Return pointer to hash (20 characters) 281 return StringRef((char *)HashResult, HASH_LENGTH); 282 } 283 284 StringRef SHA1::result() { 285 auto StateToRestore = InternalState; 286 287 auto Hash = final(); 288 289 // Restore the state 290 InternalState = StateToRestore; 291 292 // Return pointer to hash (20 characters) 293 return Hash; 294 } 295 296 std::array<uint8_t, 20> SHA1::hash(ArrayRef<uint8_t> Data) { 297 SHA1 Hash; 298 Hash.update(Data); 299 StringRef S = Hash.final(); 300 301 std::array<uint8_t, 20> Arr; 302 memcpy(Arr.data(), S.data(), S.size()); 303 return Arr; 304 } 305