1 //===- FuzzerSHA1.h - Private copy of the SHA1 implementation ---*- C++ -* ===//
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
7 //===----------------------------------------------------------------------===//
8 // This code is taken from public domain
9 // (http://oauth.googlecode.com/svn/code/c/liboauth/src/sha1.c)
10 // and modified by adding anonymous namespace, adding an interface
11 // function fuzzer::ComputeSHA1() and removing unnecessary code.
13 // lib/Fuzzer can not use SHA1 implementation from openssl because
14 // openssl may not be available and because we may be fuzzing openssl itself.
15 // For the same reason we do not want to depend on SHA1 from LLVM tree.
16 //===----------------------------------------------------------------------===//
18 #include "FuzzerSHA1.h"
19 #include "FuzzerDefs.h"
20 #include "FuzzerPlatform.h"
22 /* This code is public-domain - it is based on libcrypt
23 * placed in the public domain by Wei Dai and other contributors.
31 namespace { // Added for LibFuzzer
34 # define SHA_BIG_ENDIAN
35 // Windows is always little endian and MSVC doesn't have <endian.h>
36 #elif defined __LITTLE_ENDIAN__ || LIBFUZZER_WINDOWS
38 #elif defined __BYTE_ORDER
39 # if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
40 # define SHA_BIG_ENDIAN
42 #else // ! defined __LITTLE_ENDIAN__
43 # include <endian.h> // machine/endian.h
44 # if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
45 # define SHA_BIG_ENDIAN
52 #define HASH_LENGTH 20
53 #define BLOCK_LENGTH 64
55 typedef struct sha1nfo {
56 uint32_t buffer[BLOCK_LENGTH/4];
57 uint32_t state[HASH_LENGTH/4];
60 uint8_t keyBuffer[BLOCK_LENGTH];
61 uint8_t innerHash[HASH_LENGTH];
64 /* public API - prototypes - TODO: doxygen*/
68 void sha1_init(sha1nfo *s);
71 void sha1_writebyte(sha1nfo *s, uint8_t data);
74 void sha1_write(sha1nfo *s, const char *data, size_t len);
77 uint8_t* sha1_result(sha1nfo *s);
81 #define SHA1_K0 0x5a827999
82 #define SHA1_K20 0x6ed9eba1
83 #define SHA1_K40 0x8f1bbcdc
84 #define SHA1_K60 0xca62c1d6
86 void sha1_init(sha1nfo *s) {
87 s->state[0] = 0x67452301;
88 s->state[1] = 0xefcdab89;
89 s->state[2] = 0x98badcfe;
90 s->state[3] = 0x10325476;
91 s->state[4] = 0xc3d2e1f0;
96 uint32_t sha1_rol32(uint32_t number, uint8_t bits) {
97 return ((number << bits) | (number >> (32-bits)));
100 void sha1_hashBlock(sha1nfo *s) {
102 uint32_t a,b,c,d,e,t;
109 for (i=0; i<80; i++) {
111 t = s->buffer[(i+13)&15] ^ s->buffer[(i+8)&15] ^ s->buffer[(i+2)&15] ^ s->buffer[i&15];
112 s->buffer[i&15] = sha1_rol32(t,1);
115 t = (d ^ (b & (c ^ d))) + SHA1_K0;
117 t = (b ^ c ^ d) + SHA1_K20;
119 t = ((b & c) | (d & (b | c))) + SHA1_K40;
121 t = (b ^ c ^ d) + SHA1_K60;
123 t+=sha1_rol32(a,5) + e + s->buffer[i&15];
137 void sha1_addUncounted(sha1nfo *s, uint8_t data) {
138 uint8_t * const b = (uint8_t*) s->buffer;
139 #ifdef SHA_BIG_ENDIAN
140 b[s->bufferOffset] = data;
142 b[s->bufferOffset ^ 3] = data;
145 if (s->bufferOffset == BLOCK_LENGTH) {
151 void sha1_writebyte(sha1nfo *s, uint8_t data) {
153 sha1_addUncounted(s, data);
156 void sha1_write(sha1nfo *s, const char *data, size_t len) {
157 for (;len--;) sha1_writebyte(s, (uint8_t) *data++);
160 void sha1_pad(sha1nfo *s) {
161 // Implement SHA-1 padding (fips180-2 ยง5.1.1)
163 // Pad with 0x80 followed by 0x00 until the end of the block
164 sha1_addUncounted(s, 0x80);
165 while (s->bufferOffset != 56) sha1_addUncounted(s, 0x00);
167 // Append length in the last 8 bytes
168 sha1_addUncounted(s, 0); // We're only using 32 bit lengths
169 sha1_addUncounted(s, 0); // But SHA-1 supports 64 bit lengths
170 sha1_addUncounted(s, 0); // So zero pad the top bits
171 sha1_addUncounted(s, s->byteCount >> 29); // Shifting to multiply by 8
172 sha1_addUncounted(s, s->byteCount >> 21); // as SHA-1 supports bitstreams as well as
173 sha1_addUncounted(s, s->byteCount >> 13); // byte.
174 sha1_addUncounted(s, s->byteCount >> 5);
175 sha1_addUncounted(s, s->byteCount << 3);
178 uint8_t* sha1_result(sha1nfo *s) {
179 // Pad to complete the last block
182 #ifndef SHA_BIG_ENDIAN
183 // Swap byte order back
185 for (i=0; i<5; i++) {
187 (((s->state[i])<<24)& 0xff000000)
188 | (((s->state[i])<<8) & 0x00ff0000)
189 | (((s->state[i])>>8) & 0x0000ff00)
190 | (((s->state[i])>>24)& 0x000000ff);
194 // Return pointer to hash (20 characters)
195 return (uint8_t*) s->state;
198 } // namespace; Added for LibFuzzer
202 // The rest is added for LibFuzzer
203 void ComputeSHA1(const uint8_t *Data, size_t Len, uint8_t *Out) {
206 sha1_write(&s, (const char*)Data, Len);
207 memcpy(Out, sha1_result(&s), HASH_LENGTH);
210 std::string Sha1ToString(const uint8_t Sha1[kSHA1NumBytes]) {
211 std::stringstream SS;
212 for (int i = 0; i < kSHA1NumBytes; i++)
213 SS << std::hex << std::setfill('0') << std::setw(2) << (unsigned)Sha1[i];
217 std::string Hash(const Unit &U) {
218 uint8_t Hash[kSHA1NumBytes];
219 ComputeSHA1(U.data(), U.size(), Hash);
220 return Sha1ToString(Hash);