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llvm-mirror/lib/Support/SHA1.cpp
Chandler Carruth ae65e281f3 Update the file headers across all of the LLVM projects in the monorepo 
to reflect the new license.

We understand that people may be surprised that we're moving the header
entirely to discuss the new license. We checked this carefully with the
Foundation's lawyer and we believe this is the correct approach.

Essentially, all code in the project is now made available by the LLVM
project under our new license, so you will see that the license headers
include that license only. Some of our contributors have contributed
code under our old license, and accordingly, we have retained a copy of
our old license notice in the top-level files in each project and
repository.

llvm-svn: 351636
2019-01-19 08:50:56 +00:00

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9.4 KiB
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//====- SHA1.cpp - Private copy of the SHA1 implementation ---*- C++ -* ======//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This code is taken from public domain
// (http://oauth.googlecode.com/svn/code/c/liboauth/src/sha1.c and
// http://cvsweb.netbsd.org/bsdweb.cgi/src/common/lib/libc/hash/sha1/sha1.c?rev=1.6)
// and modified by wrapping it in a C++ interface for LLVM,
// and removing unnecessary code.
//
//===----------------------------------------------------------------------===//
#include "llvm/Support/SHA1.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/Support/Host.h"
using namespace llvm;
#include <stdint.h>
#include <string.h>
#if defined(BYTE_ORDER) && defined(BIG_ENDIAN) && BYTE_ORDER == BIG_ENDIAN
#define SHA_BIG_ENDIAN
#endif
static uint32_t rol(uint32_t Number, int Bits) {
return (Number << Bits) | (Number >> (32 - Bits));
}
static uint32_t blk0(uint32_t *Buf, int I) { return Buf[I]; }
static uint32_t blk(uint32_t *Buf, int I) {
Buf[I & 15] = rol(Buf[(I + 13) & 15] ^ Buf[(I + 8) & 15] ^ Buf[(I + 2) & 15] ^
Buf[I & 15],
1);
return Buf[I & 15];
}
static void r0(uint32_t &A, uint32_t &B, uint32_t &C, uint32_t &D, uint32_t &E,
int I, uint32_t *Buf) {
E += ((B & (C ^ D)) ^ D) + blk0(Buf, I) + 0x5A827999 + rol(A, 5);
B = rol(B, 30);
}
static void r1(uint32_t &A, uint32_t &B, uint32_t &C, uint32_t &D, uint32_t &E,
int I, uint32_t *Buf) {
E += ((B & (C ^ D)) ^ D) + blk(Buf, I) + 0x5A827999 + rol(A, 5);
B = rol(B, 30);
}
static void r2(uint32_t &A, uint32_t &B, uint32_t &C, uint32_t &D, uint32_t &E,
int I, uint32_t *Buf) {
E += (B ^ C ^ D) + blk(Buf, I) + 0x6ED9EBA1 + rol(A, 5);
B = rol(B, 30);
}
static void r3(uint32_t &A, uint32_t &B, uint32_t &C, uint32_t &D, uint32_t &E,
int I, uint32_t *Buf) {
E += (((B | C) & D) | (B & C)) + blk(Buf, I) + 0x8F1BBCDC + rol(A, 5);
B = rol(B, 30);
}
static void r4(uint32_t &A, uint32_t &B, uint32_t &C, uint32_t &D, uint32_t &E,
int I, uint32_t *Buf) {
E += (B ^ C ^ D) + blk(Buf, I) + 0xCA62C1D6 + rol(A, 5);
B = rol(B, 30);
}
/* code */
#define SHA1_K0 0x5a827999
#define SHA1_K20 0x6ed9eba1
#define SHA1_K40 0x8f1bbcdc
#define SHA1_K60 0xca62c1d6
#define SEED_0 0x67452301
#define SEED_1 0xefcdab89
#define SEED_2 0x98badcfe
#define SEED_3 0x10325476
#define SEED_4 0xc3d2e1f0
void SHA1::init() {
InternalState.State[0] = SEED_0;
InternalState.State[1] = SEED_1;
InternalState.State[2] = SEED_2;
InternalState.State[3] = SEED_3;
InternalState.State[4] = SEED_4;
InternalState.ByteCount = 0;
InternalState.BufferOffset = 0;
}
void SHA1::hashBlock() {
uint32_t A = InternalState.State[0];
uint32_t B = InternalState.State[1];
uint32_t C = InternalState.State[2];
uint32_t D = InternalState.State[3];
uint32_t E = InternalState.State[4];
// 4 rounds of 20 operations each. Loop unrolled.
r0(A, B, C, D, E, 0, InternalState.Buffer.L);
r0(E, A, B, C, D, 1, InternalState.Buffer.L);
r0(D, E, A, B, C, 2, InternalState.Buffer.L);
r0(C, D, E, A, B, 3, InternalState.Buffer.L);
r0(B, C, D, E, A, 4, InternalState.Buffer.L);
r0(A, B, C, D, E, 5, InternalState.Buffer.L);
r0(E, A, B, C, D, 6, InternalState.Buffer.L);
r0(D, E, A, B, C, 7, InternalState.Buffer.L);
r0(C, D, E, A, B, 8, InternalState.Buffer.L);
r0(B, C, D, E, A, 9, InternalState.Buffer.L);
r0(A, B, C, D, E, 10, InternalState.Buffer.L);
r0(E, A, B, C, D, 11, InternalState.Buffer.L);
r0(D, E, A, B, C, 12, InternalState.Buffer.L);
r0(C, D, E, A, B, 13, InternalState.Buffer.L);
r0(B, C, D, E, A, 14, InternalState.Buffer.L);
r0(A, B, C, D, E, 15, InternalState.Buffer.L);
r1(E, A, B, C, D, 16, InternalState.Buffer.L);
r1(D, E, A, B, C, 17, InternalState.Buffer.L);
r1(C, D, E, A, B, 18, InternalState.Buffer.L);
r1(B, C, D, E, A, 19, InternalState.Buffer.L);
r2(A, B, C, D, E, 20, InternalState.Buffer.L);
r2(E, A, B, C, D, 21, InternalState.Buffer.L);
r2(D, E, A, B, C, 22, InternalState.Buffer.L);
r2(C, D, E, A, B, 23, InternalState.Buffer.L);
r2(B, C, D, E, A, 24, InternalState.Buffer.L);
r2(A, B, C, D, E, 25, InternalState.Buffer.L);
r2(E, A, B, C, D, 26, InternalState.Buffer.L);
r2(D, E, A, B, C, 27, InternalState.Buffer.L);
r2(C, D, E, A, B, 28, InternalState.Buffer.L);
r2(B, C, D, E, A, 29, InternalState.Buffer.L);
r2(A, B, C, D, E, 30, InternalState.Buffer.L);
r2(E, A, B, C, D, 31, InternalState.Buffer.L);
r2(D, E, A, B, C, 32, InternalState.Buffer.L);
r2(C, D, E, A, B, 33, InternalState.Buffer.L);
r2(B, C, D, E, A, 34, InternalState.Buffer.L);
r2(A, B, C, D, E, 35, InternalState.Buffer.L);
r2(E, A, B, C, D, 36, InternalState.Buffer.L);
r2(D, E, A, B, C, 37, InternalState.Buffer.L);
r2(C, D, E, A, B, 38, InternalState.Buffer.L);
r2(B, C, D, E, A, 39, InternalState.Buffer.L);
r3(A, B, C, D, E, 40, InternalState.Buffer.L);
r3(E, A, B, C, D, 41, InternalState.Buffer.L);
r3(D, E, A, B, C, 42, InternalState.Buffer.L);
r3(C, D, E, A, B, 43, InternalState.Buffer.L);
r3(B, C, D, E, A, 44, InternalState.Buffer.L);
r3(A, B, C, D, E, 45, InternalState.Buffer.L);
r3(E, A, B, C, D, 46, InternalState.Buffer.L);
r3(D, E, A, B, C, 47, InternalState.Buffer.L);
r3(C, D, E, A, B, 48, InternalState.Buffer.L);
r3(B, C, D, E, A, 49, InternalState.Buffer.L);
r3(A, B, C, D, E, 50, InternalState.Buffer.L);
r3(E, A, B, C, D, 51, InternalState.Buffer.L);
r3(D, E, A, B, C, 52, InternalState.Buffer.L);
r3(C, D, E, A, B, 53, InternalState.Buffer.L);
r3(B, C, D, E, A, 54, InternalState.Buffer.L);
r3(A, B, C, D, E, 55, InternalState.Buffer.L);
r3(E, A, B, C, D, 56, InternalState.Buffer.L);
r3(D, E, A, B, C, 57, InternalState.Buffer.L);
r3(C, D, E, A, B, 58, InternalState.Buffer.L);
r3(B, C, D, E, A, 59, InternalState.Buffer.L);
r4(A, B, C, D, E, 60, InternalState.Buffer.L);
r4(E, A, B, C, D, 61, InternalState.Buffer.L);
r4(D, E, A, B, C, 62, InternalState.Buffer.L);
r4(C, D, E, A, B, 63, InternalState.Buffer.L);
r4(B, C, D, E, A, 64, InternalState.Buffer.L);
r4(A, B, C, D, E, 65, InternalState.Buffer.L);
r4(E, A, B, C, D, 66, InternalState.Buffer.L);
r4(D, E, A, B, C, 67, InternalState.Buffer.L);
r4(C, D, E, A, B, 68, InternalState.Buffer.L);
r4(B, C, D, E, A, 69, InternalState.Buffer.L);
r4(A, B, C, D, E, 70, InternalState.Buffer.L);
r4(E, A, B, C, D, 71, InternalState.Buffer.L);
r4(D, E, A, B, C, 72, InternalState.Buffer.L);
r4(C, D, E, A, B, 73, InternalState.Buffer.L);
r4(B, C, D, E, A, 74, InternalState.Buffer.L);
r4(A, B, C, D, E, 75, InternalState.Buffer.L);
r4(E, A, B, C, D, 76, InternalState.Buffer.L);
r4(D, E, A, B, C, 77, InternalState.Buffer.L);
r4(C, D, E, A, B, 78, InternalState.Buffer.L);
r4(B, C, D, E, A, 79, InternalState.Buffer.L);
InternalState.State[0] += A;
InternalState.State[1] += B;
InternalState.State[2] += C;
InternalState.State[3] += D;
InternalState.State[4] += E;
}
void SHA1::addUncounted(uint8_t Data) {
#ifdef SHA_BIG_ENDIAN
InternalState.Buffer.C[InternalState.BufferOffset] = Data;
#else
InternalState.Buffer.C[InternalState.BufferOffset ^ 3] = Data;
#endif
InternalState.BufferOffset++;
if (InternalState.BufferOffset == BLOCK_LENGTH) {
hashBlock();
InternalState.BufferOffset = 0;
}
}
void SHA1::writebyte(uint8_t Data) {
++InternalState.ByteCount;
addUncounted(Data);
}
void SHA1::update(ArrayRef<uint8_t> Data) {
for (auto &C : Data)
writebyte(C);
}
void SHA1::pad() {
// Implement SHA-1 padding (fips180-2 5.1.1)
// Pad with 0x80 followed by 0x00 until the end of the block
addUncounted(0x80);
while (InternalState.BufferOffset != 56)
addUncounted(0x00);
// Append length in the last 8 bytes
addUncounted(0); // We're only using 32 bit lengths
addUncounted(0); // But SHA-1 supports 64 bit lengths
addUncounted(0); // So zero pad the top bits
addUncounted(InternalState.ByteCount >> 29); // Shifting to multiply by 8
addUncounted(InternalState.ByteCount >>
21); // as SHA-1 supports bitstreams as well as
addUncounted(InternalState.ByteCount >> 13); // byte.
addUncounted(InternalState.ByteCount >> 5);
addUncounted(InternalState.ByteCount << 3);
}
StringRef SHA1::final() {
// Pad to complete the last block
pad();
#ifdef SHA_BIG_ENDIAN
// Just copy the current state
for (int i = 0; i < 5; i++) {
HashResult[i] = InternalState.State[i];
}
#else
// Swap byte order back
for (int i = 0; i < 5; i++) {
HashResult[i] = (((InternalState.State[i]) << 24) & 0xff000000) |
(((InternalState.State[i]) << 8) & 0x00ff0000) |
(((InternalState.State[i]) >> 8) & 0x0000ff00) |
(((InternalState.State[i]) >> 24) & 0x000000ff);
}
#endif
// Return pointer to hash (20 characters)
return StringRef((char *)HashResult, HASH_LENGTH);
}
StringRef SHA1::result() {
auto StateToRestore = InternalState;
auto Hash = final();
// Restore the state
InternalState = StateToRestore;
// Return pointer to hash (20 characters)
return Hash;
}
std::array<uint8_t, 20> SHA1::hash(ArrayRef<uint8_t> Data) {
SHA1 Hash;
Hash.update(Data);
StringRef S = Hash.final();
std::array<uint8_t, 20> Arr;
memcpy(Arr.data(), S.data(), S.size());
return Arr;
}
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