LLVM  10.0.0svn
SHA1.cpp
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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/Host.h"
20 using namespace llvm;
21 
22 #include <stdint.h>
23 #include <string.h>
24 
25 #if defined(BYTE_ORDER) && defined(BIG_ENDIAN) && BYTE_ORDER == BIG_ENDIAN
26 #define SHA_BIG_ENDIAN
27 #endif
28 
29 static uint32_t rol(uint32_t Number, int Bits) {
30  return (Number << Bits) | (Number >> (32 - Bits));
31 }
32 
33 static uint32_t blk0(uint32_t *Buf, int I) { return Buf[I]; }
34 
35 static uint32_t blk(uint32_t *Buf, int I) {
36  Buf[I & 15] = rol(Buf[(I + 13) & 15] ^ Buf[(I + 8) & 15] ^ Buf[(I + 2) & 15] ^
37  Buf[I & 15],
38  1);
39  return Buf[I & 15];
40 }
41 
42 static void r0(uint32_t &A, uint32_t &B, uint32_t &C, uint32_t &D, uint32_t &E,
43  int I, uint32_t *Buf) {
44  E += ((B & (C ^ D)) ^ D) + blk0(Buf, I) + 0x5A827999 + rol(A, 5);
45  B = rol(B, 30);
46 }
47 
48 static void r1(uint32_t &A, uint32_t &B, uint32_t &C, uint32_t &D, uint32_t &E,
49  int I, uint32_t *Buf) {
50  E += ((B & (C ^ D)) ^ D) + blk(Buf, I) + 0x5A827999 + rol(A, 5);
51  B = rol(B, 30);
52 }
53 
54 static void r2(uint32_t &A, uint32_t &B, uint32_t &C, uint32_t &D, uint32_t &E,
55  int I, uint32_t *Buf) {
56  E += (B ^ C ^ D) + blk(Buf, I) + 0x6ED9EBA1 + rol(A, 5);
57  B = rol(B, 30);
58 }
59 
60 static void r3(uint32_t &A, uint32_t &B, uint32_t &C, uint32_t &D, uint32_t &E,
61  int I, uint32_t *Buf) {
62  E += (((B | C) & D) | (B & C)) + blk(Buf, I) + 0x8F1BBCDC + rol(A, 5);
63  B = rol(B, 30);
64 }
65 
66 static void r4(uint32_t &A, uint32_t &B, uint32_t &C, uint32_t &D, uint32_t &E,
67  int I, uint32_t *Buf) {
68  E += (B ^ C ^ D) + blk(Buf, I) + 0xCA62C1D6 + rol(A, 5);
69  B = rol(B, 30);
70 }
71 
72 /* code */
73 #define SHA1_K0 0x5a827999
74 #define SHA1_K20 0x6ed9eba1
75 #define SHA1_K40 0x8f1bbcdc
76 #define SHA1_K60 0xca62c1d6
77 
78 #define SEED_0 0x67452301
79 #define SEED_1 0xefcdab89
80 #define SEED_2 0x98badcfe
81 #define SEED_3 0x10325476
82 #define SEED_4 0xc3d2e1f0
83 
84 void SHA1::init() {
85  InternalState.State[0] = SEED_0;
86  InternalState.State[1] = SEED_1;
87  InternalState.State[2] = SEED_2;
88  InternalState.State[3] = SEED_3;
89  InternalState.State[4] = SEED_4;
90  InternalState.ByteCount = 0;
91  InternalState.BufferOffset = 0;
92 }
93 
94 void SHA1::hashBlock() {
95  uint32_t A = InternalState.State[0];
96  uint32_t B = InternalState.State[1];
97  uint32_t C = InternalState.State[2];
98  uint32_t D = InternalState.State[3];
99  uint32_t E = InternalState.State[4];
100 
101  // 4 rounds of 20 operations each. Loop unrolled.
102  r0(A, B, C, D, E, 0, InternalState.Buffer.L);
103  r0(E, A, B, C, D, 1, InternalState.Buffer.L);
104  r0(D, E, A, B, C, 2, InternalState.Buffer.L);
105  r0(C, D, E, A, B, 3, InternalState.Buffer.L);
106  r0(B, C, D, E, A, 4, InternalState.Buffer.L);
107  r0(A, B, C, D, E, 5, InternalState.Buffer.L);
108  r0(E, A, B, C, D, 6, InternalState.Buffer.L);
109  r0(D, E, A, B, C, 7, InternalState.Buffer.L);
110  r0(C, D, E, A, B, 8, InternalState.Buffer.L);
111  r0(B, C, D, E, A, 9, InternalState.Buffer.L);
112  r0(A, B, C, D, E, 10, InternalState.Buffer.L);
113  r0(E, A, B, C, D, 11, InternalState.Buffer.L);
114  r0(D, E, A, B, C, 12, InternalState.Buffer.L);
115  r0(C, D, E, A, B, 13, InternalState.Buffer.L);
116  r0(B, C, D, E, A, 14, InternalState.Buffer.L);
117  r0(A, B, C, D, E, 15, InternalState.Buffer.L);
118  r1(E, A, B, C, D, 16, InternalState.Buffer.L);
119  r1(D, E, A, B, C, 17, InternalState.Buffer.L);
120  r1(C, D, E, A, B, 18, InternalState.Buffer.L);
121  r1(B, C, D, E, A, 19, InternalState.Buffer.L);
122 
123  r2(A, B, C, D, E, 20, InternalState.Buffer.L);
124  r2(E, A, B, C, D, 21, InternalState.Buffer.L);
125  r2(D, E, A, B, C, 22, InternalState.Buffer.L);
126  r2(C, D, E, A, B, 23, InternalState.Buffer.L);
127  r2(B, C, D, E, A, 24, InternalState.Buffer.L);
128  r2(A, B, C, D, E, 25, InternalState.Buffer.L);
129  r2(E, A, B, C, D, 26, InternalState.Buffer.L);
130  r2(D, E, A, B, C, 27, InternalState.Buffer.L);
131  r2(C, D, E, A, B, 28, InternalState.Buffer.L);
132  r2(B, C, D, E, A, 29, InternalState.Buffer.L);
133  r2(A, B, C, D, E, 30, InternalState.Buffer.L);
134  r2(E, A, B, C, D, 31, InternalState.Buffer.L);
135  r2(D, E, A, B, C, 32, InternalState.Buffer.L);
136  r2(C, D, E, A, B, 33, InternalState.Buffer.L);
137  r2(B, C, D, E, A, 34, InternalState.Buffer.L);
138  r2(A, B, C, D, E, 35, InternalState.Buffer.L);
139  r2(E, A, B, C, D, 36, InternalState.Buffer.L);
140  r2(D, E, A, B, C, 37, InternalState.Buffer.L);
141  r2(C, D, E, A, B, 38, InternalState.Buffer.L);
142  r2(B, C, D, E, A, 39, InternalState.Buffer.L);
143 
144  r3(A, B, C, D, E, 40, InternalState.Buffer.L);
145  r3(E, A, B, C, D, 41, InternalState.Buffer.L);
146  r3(D, E, A, B, C, 42, InternalState.Buffer.L);
147  r3(C, D, E, A, B, 43, InternalState.Buffer.L);
148  r3(B, C, D, E, A, 44, InternalState.Buffer.L);
149  r3(A, B, C, D, E, 45, InternalState.Buffer.L);
150  r3(E, A, B, C, D, 46, InternalState.Buffer.L);
151  r3(D, E, A, B, C, 47, InternalState.Buffer.L);
152  r3(C, D, E, A, B, 48, InternalState.Buffer.L);
153  r3(B, C, D, E, A, 49, InternalState.Buffer.L);
154  r3(A, B, C, D, E, 50, InternalState.Buffer.L);
155  r3(E, A, B, C, D, 51, InternalState.Buffer.L);
156  r3(D, E, A, B, C, 52, InternalState.Buffer.L);
157  r3(C, D, E, A, B, 53, InternalState.Buffer.L);
158  r3(B, C, D, E, A, 54, InternalState.Buffer.L);
159  r3(A, B, C, D, E, 55, InternalState.Buffer.L);
160  r3(E, A, B, C, D, 56, InternalState.Buffer.L);
161  r3(D, E, A, B, C, 57, InternalState.Buffer.L);
162  r3(C, D, E, A, B, 58, InternalState.Buffer.L);
163  r3(B, C, D, E, A, 59, InternalState.Buffer.L);
164 
165  r4(A, B, C, D, E, 60, InternalState.Buffer.L);
166  r4(E, A, B, C, D, 61, InternalState.Buffer.L);
167  r4(D, E, A, B, C, 62, InternalState.Buffer.L);
168  r4(C, D, E, A, B, 63, InternalState.Buffer.L);
169  r4(B, C, D, E, A, 64, InternalState.Buffer.L);
170  r4(A, B, C, D, E, 65, InternalState.Buffer.L);
171  r4(E, A, B, C, D, 66, InternalState.Buffer.L);
172  r4(D, E, A, B, C, 67, InternalState.Buffer.L);
173  r4(C, D, E, A, B, 68, InternalState.Buffer.L);
174  r4(B, C, D, E, A, 69, InternalState.Buffer.L);
175  r4(A, B, C, D, E, 70, InternalState.Buffer.L);
176  r4(E, A, B, C, D, 71, InternalState.Buffer.L);
177  r4(D, E, A, B, C, 72, InternalState.Buffer.L);
178  r4(C, D, E, A, B, 73, InternalState.Buffer.L);
179  r4(B, C, D, E, A, 74, InternalState.Buffer.L);
180  r4(A, B, C, D, E, 75, InternalState.Buffer.L);
181  r4(E, A, B, C, D, 76, InternalState.Buffer.L);
182  r4(D, E, A, B, C, 77, InternalState.Buffer.L);
183  r4(C, D, E, A, B, 78, InternalState.Buffer.L);
184  r4(B, C, D, E, A, 79, InternalState.Buffer.L);
185 
186  InternalState.State[0] += A;
187  InternalState.State[1] += B;
188  InternalState.State[2] += C;
189  InternalState.State[3] += D;
190  InternalState.State[4] += E;
191 }
192 
193 void SHA1::addUncounted(uint8_t Data) {
194 #ifdef SHA_BIG_ENDIAN
195  InternalState.Buffer.C[InternalState.BufferOffset] = Data;
196 #else
197  InternalState.Buffer.C[InternalState.BufferOffset ^ 3] = Data;
198 #endif
199 
200  InternalState.BufferOffset++;
201  if (InternalState.BufferOffset == BLOCK_LENGTH) {
202  hashBlock();
203  InternalState.BufferOffset = 0;
204  }
205 }
206 
207 void SHA1::writebyte(uint8_t Data) {
208  ++InternalState.ByteCount;
209  addUncounted(Data);
210 }
211 
213  for (auto &C : Data)
214  writebyte(C);
215 }
216 
217 void SHA1::pad() {
218  // Implement SHA-1 padding (fips180-2 5.1.1)
219 
220  // Pad with 0x80 followed by 0x00 until the end of the block
221  addUncounted(0x80);
222  while (InternalState.BufferOffset != 56)
223  addUncounted(0x00);
224 
225  // Append length in the last 8 bytes
226  addUncounted(0); // We're only using 32 bit lengths
227  addUncounted(0); // But SHA-1 supports 64 bit lengths
228  addUncounted(0); // So zero pad the top bits
229  addUncounted(InternalState.ByteCount >> 29); // Shifting to multiply by 8
230  addUncounted(InternalState.ByteCount >>
231  21); // as SHA-1 supports bitstreams as well as
232  addUncounted(InternalState.ByteCount >> 13); // byte.
233  addUncounted(InternalState.ByteCount >> 5);
234  addUncounted(InternalState.ByteCount << 3);
235 }
236 
238  // Pad to complete the last block
239  pad();
240 
241 #ifdef SHA_BIG_ENDIAN
242  // Just copy the current state
243  for (int i = 0; i < 5; i++) {
244  HashResult[i] = InternalState.State[i];
245  }
246 #else
247  // Swap byte order back
248  for (int i = 0; i < 5; i++) {
249  HashResult[i] = (((InternalState.State[i]) << 24) & 0xff000000) |
250  (((InternalState.State[i]) << 8) & 0x00ff0000) |
251  (((InternalState.State[i]) >> 8) & 0x0000ff00) |
252  (((InternalState.State[i]) >> 24) & 0x000000ff);
253  }
254 #endif
255 
256  // Return pointer to hash (20 characters)
257  return StringRef((char *)HashResult, HASH_LENGTH);
258 }
259 
261  auto StateToRestore = InternalState;
262 
263  auto Hash = final();
264 
265  // Restore the state
266  InternalState = StateToRestore;
267 
268  // Return pointer to hash (20 characters)
269  return Hash;
270 }
271 
272 std::array<uint8_t, 20> SHA1::hash(ArrayRef<uint8_t> Data) {
273  SHA1 Hash;
274  Hash.update(Data);
275  StringRef S = Hash.final();
276 
277  std::array<uint8_t, 20> Arr;
278  memcpy(Arr.data(), S.data(), S.size());
279  return Arr;
280 }
uint64_t CallInst * C
#define SEED_2
Definition: SHA1.cpp:80
static void r3(uint32_t &A, uint32_t &B, uint32_t &C, uint32_t &D, uint32_t &E, int I, uint32_t *Buf)
Definition: SHA1.cpp:60
static void r2(uint32_t &A, uint32_t &B, uint32_t &C, uint32_t &D, uint32_t &E, int I, uint32_t *Buf)
Definition: SHA1.cpp:54
This class represents lattice values for constants.
Definition: AllocatorList.h:23
static uint32_t blk0(uint32_t *Buf, int I)
Definition: SHA1.cpp:33
A class that wrap the SHA1 algorithm.
Definition: SHA1.h:28
void init()
Reinitialize the internal state.
Definition: SHA1.cpp:84
StringRef final()
Return a reference to the current raw 160-bits SHA1 for the digested data since the last call to init...
Definition: SHA1.cpp:237
StringRef result()
Return a reference to the current raw 160-bits SHA1 for the digested data since the last call to init...
Definition: SHA1.cpp:260
LLVM_NODISCARD size_t size() const
size - Get the string size.
Definition: StringRef.h:130
void update(ArrayRef< uint8_t > Data)
Digest more data.
Definition: SHA1.cpp:212
static GCRegistry::Add< OcamlGC > B("ocaml", "ocaml 3.10-compatible GC")
static GCRegistry::Add< CoreCLRGC > E("coreclr", "CoreCLR-compatible GC")
static uint32_t rol(uint32_t Number, int Bits)
Definition: SHA1.cpp:29
#define SEED_4
Definition: SHA1.cpp:82
static void r1(uint32_t &A, uint32_t &B, uint32_t &C, uint32_t &D, uint32_t &E, int I, uint32_t *Buf)
Definition: SHA1.cpp:48
static std::array< uint8_t, 20 > hash(ArrayRef< uint8_t > Data)
Returns a raw 160-bit SHA1 hash for the given data.
Definition: SHA1.cpp:272
static void r4(uint32_t &A, uint32_t &B, uint32_t &C, uint32_t &D, uint32_t &E, int I, uint32_t *Buf)
Definition: SHA1.cpp:66
#define SEED_0
Definition: SHA1.cpp:78
static GCRegistry::Add< StatepointGC > D("statepoint-example", "an example strategy for statepoint")
#define SEED_3
Definition: SHA1.cpp:81
#define I(x, y, z)
Definition: MD5.cpp:58
static void r0(uint32_t &A, uint32_t &B, uint32_t &C, uint32_t &D, uint32_t &E, int I, uint32_t *Buf)
Definition: SHA1.cpp:42
uint8_t C[BLOCK_LENGTH]
Definition: SHA1.h:68
LLVM_NODISCARD const char * data() const
data - Get a pointer to the start of the string (which may not be null terminated).
Definition: StringRef.h:122
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:48
static uint32_t blk(uint32_t *Buf, int I)
Definition: SHA1.cpp:35
#define SEED_1
Definition: SHA1.cpp:79