295 lines
11 KiB
C++
295 lines
11 KiB
C++
//====- SHA256.cpp - SHA256 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
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
/*
|
|
* The SHA-256 Secure Hash Standard was published by NIST in 2002.
|
|
*
|
|
* http://csrc.nist.gov/publications/fips/fips180-2/fips180-2.pdf
|
|
*
|
|
* The implementation is based on nacl's sha256 implementation [0] and LLVM's
|
|
* pre-exsiting SHA1 code [1].
|
|
*
|
|
* [0] https://hyperelliptic.org/nacl/nacl-20110221.tar.bz2 (public domain
|
|
* code)
|
|
* [1] llvm/lib/Support/SHA1.{h,cpp}
|
|
*/
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/Support/SHA256.h"
|
|
#include "llvm/ADT/ArrayRef.h"
|
|
#include "llvm/ADT/StringRef.h"
|
|
#include "llvm/Support/Endian.h"
|
|
#include "llvm/Support/Host.h"
|
|
#include <string.h>
|
|
|
|
namespace llvm {
|
|
|
|
#if defined(BYTE_ORDER) && defined(BIG_ENDIAN) && BYTE_ORDER == BIG_ENDIAN
|
|
#define SHA_BIG_ENDIAN
|
|
#endif
|
|
|
|
#define SHR(x, c) ((x) >> (c))
|
|
#define ROTR(x, n) (((x) >> n) | ((x) << (32 - (n))))
|
|
|
|
#define CH(x, y, z) (((x) & (y)) ^ (~(x) & (z)))
|
|
#define MAJ(x, y, z) (((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z)))
|
|
|
|
#define SIGMA_0(x) (ROTR(x, 2) ^ ROTR(x, 13) ^ ROTR(x, 22))
|
|
#define SIGMA_1(x) (ROTR(x, 6) ^ ROTR(x, 11) ^ ROTR(x, 25))
|
|
|
|
#define SIGMA_2(x) (ROTR(x, 17) ^ ROTR(x, 19) ^ SHR(x, 10))
|
|
#define SIGMA_3(x) (ROTR(x, 7) ^ ROTR(x, 18) ^ SHR(x, 3))
|
|
|
|
#define F_EXPAND(A, B, C, D, E, F, G, H, M1, M2, M3, M4, k) \
|
|
do { \
|
|
H += SIGMA_1(E) + CH(E, F, G) + M1 + k; \
|
|
D += H; \
|
|
H += SIGMA_0(A) + MAJ(A, B, C); \
|
|
M1 += SIGMA_2(M2) + M3 + SIGMA_3(M4); \
|
|
} while (0);
|
|
|
|
void SHA256::init() {
|
|
InternalState.State[0] = 0x6A09E667;
|
|
InternalState.State[1] = 0xBB67AE85;
|
|
InternalState.State[2] = 0x3C6EF372;
|
|
InternalState.State[3] = 0xA54FF53A;
|
|
InternalState.State[4] = 0x510E527F;
|
|
InternalState.State[5] = 0x9B05688C;
|
|
InternalState.State[6] = 0x1F83D9AB;
|
|
InternalState.State[7] = 0x5BE0CD19;
|
|
InternalState.ByteCount = 0;
|
|
InternalState.BufferOffset = 0;
|
|
}
|
|
|
|
void SHA256::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];
|
|
uint32_t F = InternalState.State[5];
|
|
uint32_t G = InternalState.State[6];
|
|
uint32_t H = InternalState.State[7];
|
|
|
|
uint32_t W00 = InternalState.Buffer.L[0];
|
|
uint32_t W01 = InternalState.Buffer.L[1];
|
|
uint32_t W02 = InternalState.Buffer.L[2];
|
|
uint32_t W03 = InternalState.Buffer.L[3];
|
|
uint32_t W04 = InternalState.Buffer.L[4];
|
|
uint32_t W05 = InternalState.Buffer.L[5];
|
|
uint32_t W06 = InternalState.Buffer.L[6];
|
|
uint32_t W07 = InternalState.Buffer.L[7];
|
|
uint32_t W08 = InternalState.Buffer.L[8];
|
|
uint32_t W09 = InternalState.Buffer.L[9];
|
|
uint32_t W10 = InternalState.Buffer.L[10];
|
|
uint32_t W11 = InternalState.Buffer.L[11];
|
|
uint32_t W12 = InternalState.Buffer.L[12];
|
|
uint32_t W13 = InternalState.Buffer.L[13];
|
|
uint32_t W14 = InternalState.Buffer.L[14];
|
|
uint32_t W15 = InternalState.Buffer.L[15];
|
|
|
|
F_EXPAND(A, B, C, D, E, F, G, H, W00, W14, W09, W01, 0x428A2F98);
|
|
F_EXPAND(H, A, B, C, D, E, F, G, W01, W15, W10, W02, 0x71374491);
|
|
F_EXPAND(G, H, A, B, C, D, E, F, W02, W00, W11, W03, 0xB5C0FBCF);
|
|
F_EXPAND(F, G, H, A, B, C, D, E, W03, W01, W12, W04, 0xE9B5DBA5);
|
|
F_EXPAND(E, F, G, H, A, B, C, D, W04, W02, W13, W05, 0x3956C25B);
|
|
F_EXPAND(D, E, F, G, H, A, B, C, W05, W03, W14, W06, 0x59F111F1);
|
|
F_EXPAND(C, D, E, F, G, H, A, B, W06, W04, W15, W07, 0x923F82A4);
|
|
F_EXPAND(B, C, D, E, F, G, H, A, W07, W05, W00, W08, 0xAB1C5ED5);
|
|
F_EXPAND(A, B, C, D, E, F, G, H, W08, W06, W01, W09, 0xD807AA98);
|
|
F_EXPAND(H, A, B, C, D, E, F, G, W09, W07, W02, W10, 0x12835B01);
|
|
F_EXPAND(G, H, A, B, C, D, E, F, W10, W08, W03, W11, 0x243185BE);
|
|
F_EXPAND(F, G, H, A, B, C, D, E, W11, W09, W04, W12, 0x550C7DC3);
|
|
F_EXPAND(E, F, G, H, A, B, C, D, W12, W10, W05, W13, 0x72BE5D74);
|
|
F_EXPAND(D, E, F, G, H, A, B, C, W13, W11, W06, W14, 0x80DEB1FE);
|
|
F_EXPAND(C, D, E, F, G, H, A, B, W14, W12, W07, W15, 0x9BDC06A7);
|
|
F_EXPAND(B, C, D, E, F, G, H, A, W15, W13, W08, W00, 0xC19BF174);
|
|
|
|
F_EXPAND(A, B, C, D, E, F, G, H, W00, W14, W09, W01, 0xE49B69C1);
|
|
F_EXPAND(H, A, B, C, D, E, F, G, W01, W15, W10, W02, 0xEFBE4786);
|
|
F_EXPAND(G, H, A, B, C, D, E, F, W02, W00, W11, W03, 0x0FC19DC6);
|
|
F_EXPAND(F, G, H, A, B, C, D, E, W03, W01, W12, W04, 0x240CA1CC);
|
|
F_EXPAND(E, F, G, H, A, B, C, D, W04, W02, W13, W05, 0x2DE92C6F);
|
|
F_EXPAND(D, E, F, G, H, A, B, C, W05, W03, W14, W06, 0x4A7484AA);
|
|
F_EXPAND(C, D, E, F, G, H, A, B, W06, W04, W15, W07, 0x5CB0A9DC);
|
|
F_EXPAND(B, C, D, E, F, G, H, A, W07, W05, W00, W08, 0x76F988DA);
|
|
F_EXPAND(A, B, C, D, E, F, G, H, W08, W06, W01, W09, 0x983E5152);
|
|
F_EXPAND(H, A, B, C, D, E, F, G, W09, W07, W02, W10, 0xA831C66D);
|
|
F_EXPAND(G, H, A, B, C, D, E, F, W10, W08, W03, W11, 0xB00327C8);
|
|
F_EXPAND(F, G, H, A, B, C, D, E, W11, W09, W04, W12, 0xBF597FC7);
|
|
F_EXPAND(E, F, G, H, A, B, C, D, W12, W10, W05, W13, 0xC6E00BF3);
|
|
F_EXPAND(D, E, F, G, H, A, B, C, W13, W11, W06, W14, 0xD5A79147);
|
|
F_EXPAND(C, D, E, F, G, H, A, B, W14, W12, W07, W15, 0x06CA6351);
|
|
F_EXPAND(B, C, D, E, F, G, H, A, W15, W13, W08, W00, 0x14292967);
|
|
|
|
F_EXPAND(A, B, C, D, E, F, G, H, W00, W14, W09, W01, 0x27B70A85);
|
|
F_EXPAND(H, A, B, C, D, E, F, G, W01, W15, W10, W02, 0x2E1B2138);
|
|
F_EXPAND(G, H, A, B, C, D, E, F, W02, W00, W11, W03, 0x4D2C6DFC);
|
|
F_EXPAND(F, G, H, A, B, C, D, E, W03, W01, W12, W04, 0x53380D13);
|
|
F_EXPAND(E, F, G, H, A, B, C, D, W04, W02, W13, W05, 0x650A7354);
|
|
F_EXPAND(D, E, F, G, H, A, B, C, W05, W03, W14, W06, 0x766A0ABB);
|
|
F_EXPAND(C, D, E, F, G, H, A, B, W06, W04, W15, W07, 0x81C2C92E);
|
|
F_EXPAND(B, C, D, E, F, G, H, A, W07, W05, W00, W08, 0x92722C85);
|
|
F_EXPAND(A, B, C, D, E, F, G, H, W08, W06, W01, W09, 0xA2BFE8A1);
|
|
F_EXPAND(H, A, B, C, D, E, F, G, W09, W07, W02, W10, 0xA81A664B);
|
|
F_EXPAND(G, H, A, B, C, D, E, F, W10, W08, W03, W11, 0xC24B8B70);
|
|
F_EXPAND(F, G, H, A, B, C, D, E, W11, W09, W04, W12, 0xC76C51A3);
|
|
F_EXPAND(E, F, G, H, A, B, C, D, W12, W10, W05, W13, 0xD192E819);
|
|
F_EXPAND(D, E, F, G, H, A, B, C, W13, W11, W06, W14, 0xD6990624);
|
|
F_EXPAND(C, D, E, F, G, H, A, B, W14, W12, W07, W15, 0xF40E3585);
|
|
F_EXPAND(B, C, D, E, F, G, H, A, W15, W13, W08, W00, 0x106AA070);
|
|
|
|
F_EXPAND(A, B, C, D, E, F, G, H, W00, W14, W09, W01, 0x19A4C116);
|
|
F_EXPAND(H, A, B, C, D, E, F, G, W01, W15, W10, W02, 0x1E376C08);
|
|
F_EXPAND(G, H, A, B, C, D, E, F, W02, W00, W11, W03, 0x2748774C);
|
|
F_EXPAND(F, G, H, A, B, C, D, E, W03, W01, W12, W04, 0x34B0BCB5);
|
|
F_EXPAND(E, F, G, H, A, B, C, D, W04, W02, W13, W05, 0x391C0CB3);
|
|
F_EXPAND(D, E, F, G, H, A, B, C, W05, W03, W14, W06, 0x4ED8AA4A);
|
|
F_EXPAND(C, D, E, F, G, H, A, B, W06, W04, W15, W07, 0x5B9CCA4F);
|
|
F_EXPAND(B, C, D, E, F, G, H, A, W07, W05, W00, W08, 0x682E6FF3);
|
|
F_EXPAND(A, B, C, D, E, F, G, H, W08, W06, W01, W09, 0x748F82EE);
|
|
F_EXPAND(H, A, B, C, D, E, F, G, W09, W07, W02, W10, 0x78A5636F);
|
|
F_EXPAND(G, H, A, B, C, D, E, F, W10, W08, W03, W11, 0x84C87814);
|
|
F_EXPAND(F, G, H, A, B, C, D, E, W11, W09, W04, W12, 0x8CC70208);
|
|
F_EXPAND(E, F, G, H, A, B, C, D, W12, W10, W05, W13, 0x90BEFFFA);
|
|
F_EXPAND(D, E, F, G, H, A, B, C, W13, W11, W06, W14, 0xA4506CEB);
|
|
F_EXPAND(C, D, E, F, G, H, A, B, W14, W12, W07, W15, 0xBEF9A3F7);
|
|
F_EXPAND(B, C, D, E, F, G, H, A, W15, W13, W08, W00, 0xC67178F2);
|
|
|
|
InternalState.State[0] += A;
|
|
InternalState.State[1] += B;
|
|
InternalState.State[2] += C;
|
|
InternalState.State[3] += D;
|
|
InternalState.State[4] += E;
|
|
InternalState.State[5] += F;
|
|
InternalState.State[6] += G;
|
|
InternalState.State[7] += H;
|
|
}
|
|
|
|
void SHA256::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 SHA256::writebyte(uint8_t Data) {
|
|
++InternalState.ByteCount;
|
|
addUncounted(Data);
|
|
}
|
|
|
|
void SHA256::update(ArrayRef<uint8_t> Data) {
|
|
InternalState.ByteCount += Data.size();
|
|
|
|
// Finish the current block.
|
|
if (InternalState.BufferOffset > 0) {
|
|
const size_t Remainder = std::min<size_t>(
|
|
Data.size(), BLOCK_LENGTH - InternalState.BufferOffset);
|
|
for (size_t I = 0; I < Remainder; ++I)
|
|
addUncounted(Data[I]);
|
|
Data = Data.drop_front(Remainder);
|
|
}
|
|
|
|
// Fast buffer filling for large inputs.
|
|
while (Data.size() >= BLOCK_LENGTH) {
|
|
assert(InternalState.BufferOffset == 0);
|
|
static_assert(BLOCK_LENGTH % 4 == 0);
|
|
constexpr size_t BLOCK_LENGTH_32 = BLOCK_LENGTH / 4;
|
|
for (size_t I = 0; I < BLOCK_LENGTH_32; ++I)
|
|
InternalState.Buffer.L[I] = support::endian::read32be(&Data[I * 4]);
|
|
hashBlock();
|
|
Data = Data.drop_front(BLOCK_LENGTH);
|
|
}
|
|
|
|
// Finish the remainder.
|
|
for (uint8_t C : Data)
|
|
addUncounted(C);
|
|
}
|
|
|
|
void SHA256::update(StringRef Str) {
|
|
update(
|
|
ArrayRef<uint8_t>((uint8_t *)const_cast<char *>(Str.data()), Str.size()));
|
|
}
|
|
|
|
void SHA256::pad() {
|
|
// Implement SHA-2 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);
|
|
|
|
uint64_t len = InternalState.ByteCount << 3; // bit size
|
|
|
|
// Append length in the last 8 bytes big edian encoded
|
|
addUncounted(len >> 56);
|
|
addUncounted(len >> 48);
|
|
addUncounted(len >> 40);
|
|
addUncounted(len >> 32);
|
|
addUncounted(len >> 24);
|
|
addUncounted(len >> 16);
|
|
addUncounted(len >> 8);
|
|
addUncounted(len);
|
|
}
|
|
|
|
void SHA256::final(std::array<uint32_t, HASH_LENGTH / 4> &HashResult) {
|
|
// Pad to complete the last block
|
|
pad();
|
|
|
|
#ifdef SHA_BIG_ENDIAN
|
|
// Just copy the current state
|
|
for (int i = 0; i < 8; i++) {
|
|
HashResult[i] = InternalState.State[i];
|
|
}
|
|
#else
|
|
// Swap byte order back
|
|
for (int i = 0; i < 8; i++) {
|
|
HashResult[i] = (((InternalState.State[i]) << 24) & 0xff000000) |
|
|
(((InternalState.State[i]) << 8) & 0x00ff0000) |
|
|
(((InternalState.State[i]) >> 8) & 0x0000ff00) |
|
|
(((InternalState.State[i]) >> 24) & 0x000000ff);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
std::array<uint8_t, 32> SHA256::final() {
|
|
union {
|
|
std::array<uint32_t, HASH_LENGTH / 4> HashResult;
|
|
std::array<uint8_t, HASH_LENGTH> ReturnResult;
|
|
};
|
|
static_assert(sizeof(HashResult) == sizeof(ReturnResult));
|
|
final(HashResult);
|
|
return ReturnResult;
|
|
}
|
|
|
|
std::array<uint8_t, 32> SHA256::result() {
|
|
auto StateToRestore = InternalState;
|
|
|
|
auto Hash = final();
|
|
|
|
// Restore the state
|
|
InternalState = StateToRestore;
|
|
|
|
// Return pointer to hash (32 characters)
|
|
return Hash;
|
|
}
|
|
|
|
std::array<uint8_t, 32> SHA256::hash(ArrayRef<uint8_t> Data) {
|
|
SHA256 Hash;
|
|
Hash.update(Data);
|
|
return Hash.final();
|
|
}
|
|
|
|
} // namespace llvm
|