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334 lines
12 KiB
C++
334 lines
12 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/Assertions.h"
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#include "mozilla/Endian.h"
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#include "mozilla/SHA1.h"
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#include <string.h>
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using mozilla::NativeEndian;
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using mozilla::SHA1Sum;
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static inline uint32_t
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SHA_ROTL(uint32_t aT, uint32_t aN)
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{
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MOZ_ASSERT(aN < 32);
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return (aT << aN) | (aT >> (32 - aN));
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}
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static void
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shaCompress(volatile unsigned* aX, const uint32_t* aBuf);
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#define SHA_F1(X, Y, Z) ((((Y) ^ (Z)) & (X)) ^ (Z))
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#define SHA_F2(X, Y, Z) ((X) ^ (Y) ^ (Z))
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#define SHA_F3(X, Y, Z) (((X) & (Y)) | ((Z) & ((X) | (Y))))
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#define SHA_F4(X, Y, Z) ((X) ^ (Y) ^ (Z))
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#define SHA_MIX(n, a, b, c) XW(n) = SHA_ROTL(XW(a) ^ XW(b) ^ XW(c) ^XW(n), 1)
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SHA1Sum::SHA1Sum()
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: mSize(0), mDone(false)
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{
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// Initialize H with constants from FIPS180-1.
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mH[0] = 0x67452301L;
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mH[1] = 0xefcdab89L;
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mH[2] = 0x98badcfeL;
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mH[3] = 0x10325476L;
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mH[4] = 0xc3d2e1f0L;
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}
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/*
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* Explanation of H array and index values:
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*
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* The context's H array is actually the concatenation of two arrays
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* defined by SHA1, the H array of state variables (5 elements),
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* and the W array of intermediate values, of which there are 16 elements.
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* The W array starts at H[5], that is W[0] is H[5].
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* Although these values are defined as 32-bit values, we use 64-bit
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* variables to hold them because the AMD64 stores 64 bit values in
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* memory MUCH faster than it stores any smaller values.
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*
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* Rather than passing the context structure to shaCompress, we pass
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* this combined array of H and W values. We do not pass the address
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* of the first element of this array, but rather pass the address of an
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* element in the middle of the array, element X. Presently X[0] is H[11].
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* So we pass the address of H[11] as the address of array X to shaCompress.
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* Then shaCompress accesses the members of the array using positive AND
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* negative indexes.
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*
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* Pictorially: (each element is 8 bytes)
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* H | H0 H1 H2 H3 H4 W0 W1 W2 W3 W4 W5 W6 W7 W8 W9 Wa Wb Wc Wd We Wf |
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* X |-11-10 -9 -8 -7 -6 -5 -4 -3 -2 -1 X0 X1 X2 X3 X4 X5 X6 X7 X8 X9 |
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*
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* The byte offset from X[0] to any member of H and W is always
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* representable in a signed 8-bit value, which will be encoded
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* as a single byte offset in the X86-64 instruction set.
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* If we didn't pass the address of H[11], and instead passed the
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* address of H[0], the offsets to elements H[16] and above would be
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* greater than 127, not representable in a signed 8-bit value, and the
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* x86-64 instruction set would encode every such offset as a 32-bit
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* signed number in each instruction that accessed element H[16] or
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* higher. This results in much bigger and slower code.
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*/
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#define H2X 11 /* X[0] is H[11], and H[0] is X[-11] */
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#define W2X 6 /* X[0] is W[6], and W[0] is X[-6] */
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/*
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* SHA: Add data to context.
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*/
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void
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SHA1Sum::update(const void* aData, uint32_t aLen)
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{
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MOZ_ASSERT(!mDone, "SHA1Sum can only be used to compute a single hash.");
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const uint8_t* data = static_cast<const uint8_t*>(aData);
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if (aLen == 0) {
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return;
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}
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/* Accumulate the byte count. */
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unsigned int lenB = static_cast<unsigned int>(mSize) & 63U;
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mSize += aLen;
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/* Read the data into W and process blocks as they get full. */
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unsigned int togo;
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if (lenB > 0) {
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togo = 64U - lenB;
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if (aLen < togo) {
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togo = aLen;
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}
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memcpy(mU.mB + lenB, data, togo);
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aLen -= togo;
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data += togo;
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lenB = (lenB + togo) & 63U;
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if (!lenB) {
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shaCompress(&mH[H2X], mU.mW);
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}
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}
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while (aLen >= 64U) {
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aLen -= 64U;
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shaCompress(&mH[H2X], reinterpret_cast<const uint32_t*>(data));
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data += 64U;
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}
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if (aLen > 0) {
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memcpy(mU.mB, data, aLen);
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}
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}
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/*
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* SHA: Generate hash value
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*/
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void
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SHA1Sum::finish(SHA1Sum::Hash& aHashOut)
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{
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MOZ_ASSERT(!mDone, "SHA1Sum can only be used to compute a single hash.");
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uint64_t size = mSize;
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uint32_t lenB = uint32_t(size) & 63;
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static const uint8_t bulk_pad[64] =
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{ 0x80,0,0,0,0,0,0,0,0,0,
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 };
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/* Pad with a binary 1 (e.g. 0x80), then zeroes, then length in bits. */
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update(bulk_pad, (((55 + 64) - lenB) & 63) + 1);
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MOZ_ASSERT((uint32_t(mSize) & 63) == 56);
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/* Convert size from bytes to bits. */
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size <<= 3;
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mU.mW[14] = NativeEndian::swapToBigEndian(uint32_t(size >> 32));
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mU.mW[15] = NativeEndian::swapToBigEndian(uint32_t(size));
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shaCompress(&mH[H2X], mU.mW);
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/* Output hash. */
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mU.mW[0] = NativeEndian::swapToBigEndian(mH[0]);
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mU.mW[1] = NativeEndian::swapToBigEndian(mH[1]);
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mU.mW[2] = NativeEndian::swapToBigEndian(mH[2]);
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mU.mW[3] = NativeEndian::swapToBigEndian(mH[3]);
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mU.mW[4] = NativeEndian::swapToBigEndian(mH[4]);
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memcpy(aHashOut, mU.mW, 20);
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mDone = true;
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}
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/*
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* SHA: Compression function, unrolled.
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*
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* Some operations in shaCompress are done as 5 groups of 16 operations.
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* Others are done as 4 groups of 20 operations.
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* The code below shows that structure.
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*
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* The functions that compute the new values of the 5 state variables
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* A-E are done in 4 groups of 20 operations (or you may also think
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* of them as being done in 16 groups of 5 operations). They are
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* done by the SHA_RNDx macros below, in the right column.
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*
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* The functions that set the 16 values of the W array are done in
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* 5 groups of 16 operations. The first group is done by the
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* LOAD macros below, the latter 4 groups are done by SHA_MIX below,
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* in the left column.
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*
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* gcc's optimizer observes that each member of the W array is assigned
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* a value 5 times in this code. It reduces the number of store
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* operations done to the W array in the context (that is, in the X array)
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* by creating a W array on the stack, and storing the W values there for
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* the first 4 groups of operations on W, and storing the values in the
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* context's W array only in the fifth group. This is undesirable.
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* It is MUCH bigger code than simply using the context's W array, because
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* all the offsets to the W array in the stack are 32-bit signed offsets,
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* and it is no faster than storing the values in the context's W array.
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*
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* The original code for sha_fast.c prevented this creation of a separate
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* W array in the stack by creating a W array of 80 members, each of
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* whose elements is assigned only once. It also separated the computations
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* of the W array values and the computations of the values for the 5
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* state variables into two separate passes, W's, then A-E's so that the
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* second pass could be done all in registers (except for accessing the W
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* array) on machines with fewer registers. The method is suboptimal
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* for machines with enough registers to do it all in one pass, and it
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* necessitates using many instructions with 32-bit offsets.
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*
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* This code eliminates the separate W array on the stack by a completely
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* different means: by declaring the X array volatile. This prevents
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* the optimizer from trying to reduce the use of the X array by the
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* creation of a MORE expensive W array on the stack. The result is
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* that all instructions use signed 8-bit offsets and not 32-bit offsets.
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*
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* The combination of this code and the -O3 optimizer flag on GCC 3.4.3
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* results in code that is 3 times faster than the previous NSS sha_fast
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* code on AMD64.
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*/
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static void
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shaCompress(volatile unsigned* aX, const uint32_t* aBuf)
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{
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unsigned A, B, C, D, E;
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#define XH(n) aX[n - H2X]
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#define XW(n) aX[n - W2X]
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#define K0 0x5a827999L
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#define K1 0x6ed9eba1L
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#define K2 0x8f1bbcdcL
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#define K3 0xca62c1d6L
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#define SHA_RND1(a, b, c, d, e, n) \
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a = SHA_ROTL(b, 5) + SHA_F1(c, d, e) + a + XW(n) + K0; c = SHA_ROTL(c, 30)
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#define SHA_RND2(a, b, c, d, e, n) \
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a = SHA_ROTL(b, 5) + SHA_F2(c, d, e) + a + XW(n) + K1; c = SHA_ROTL(c, 30)
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#define SHA_RND3(a, b, c, d, e, n) \
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a = SHA_ROTL(b, 5) + SHA_F3(c, d, e) + a + XW(n) + K2; c = SHA_ROTL(c, 30)
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#define SHA_RND4(a, b, c, d, e, n) \
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a = SHA_ROTL(b ,5) + SHA_F4(c, d, e) + a + XW(n) + K3; c = SHA_ROTL(c, 30)
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#define LOAD(n) XW(n) = NativeEndian::swapToBigEndian(aBuf[n])
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A = XH(0);
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B = XH(1);
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C = XH(2);
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D = XH(3);
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E = XH(4);
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LOAD(0); SHA_RND1(E,A,B,C,D, 0);
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LOAD(1); SHA_RND1(D,E,A,B,C, 1);
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LOAD(2); SHA_RND1(C,D,E,A,B, 2);
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LOAD(3); SHA_RND1(B,C,D,E,A, 3);
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LOAD(4); SHA_RND1(A,B,C,D,E, 4);
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LOAD(5); SHA_RND1(E,A,B,C,D, 5);
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LOAD(6); SHA_RND1(D,E,A,B,C, 6);
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LOAD(7); SHA_RND1(C,D,E,A,B, 7);
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LOAD(8); SHA_RND1(B,C,D,E,A, 8);
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LOAD(9); SHA_RND1(A,B,C,D,E, 9);
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LOAD(10); SHA_RND1(E,A,B,C,D,10);
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LOAD(11); SHA_RND1(D,E,A,B,C,11);
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LOAD(12); SHA_RND1(C,D,E,A,B,12);
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LOAD(13); SHA_RND1(B,C,D,E,A,13);
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LOAD(14); SHA_RND1(A,B,C,D,E,14);
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LOAD(15); SHA_RND1(E,A,B,C,D,15);
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SHA_MIX( 0, 13, 8, 2); SHA_RND1(D,E,A,B,C, 0);
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SHA_MIX( 1, 14, 9, 3); SHA_RND1(C,D,E,A,B, 1);
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SHA_MIX( 2, 15, 10, 4); SHA_RND1(B,C,D,E,A, 2);
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SHA_MIX( 3, 0, 11, 5); SHA_RND1(A,B,C,D,E, 3);
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SHA_MIX( 4, 1, 12, 6); SHA_RND2(E,A,B,C,D, 4);
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SHA_MIX( 5, 2, 13, 7); SHA_RND2(D,E,A,B,C, 5);
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SHA_MIX( 6, 3, 14, 8); SHA_RND2(C,D,E,A,B, 6);
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SHA_MIX( 7, 4, 15, 9); SHA_RND2(B,C,D,E,A, 7);
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SHA_MIX( 8, 5, 0, 10); SHA_RND2(A,B,C,D,E, 8);
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SHA_MIX( 9, 6, 1, 11); SHA_RND2(E,A,B,C,D, 9);
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SHA_MIX(10, 7, 2, 12); SHA_RND2(D,E,A,B,C,10);
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SHA_MIX(11, 8, 3, 13); SHA_RND2(C,D,E,A,B,11);
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SHA_MIX(12, 9, 4, 14); SHA_RND2(B,C,D,E,A,12);
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SHA_MIX(13, 10, 5, 15); SHA_RND2(A,B,C,D,E,13);
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SHA_MIX(14, 11, 6, 0); SHA_RND2(E,A,B,C,D,14);
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SHA_MIX(15, 12, 7, 1); SHA_RND2(D,E,A,B,C,15);
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SHA_MIX( 0, 13, 8, 2); SHA_RND2(C,D,E,A,B, 0);
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SHA_MIX( 1, 14, 9, 3); SHA_RND2(B,C,D,E,A, 1);
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SHA_MIX( 2, 15, 10, 4); SHA_RND2(A,B,C,D,E, 2);
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SHA_MIX( 3, 0, 11, 5); SHA_RND2(E,A,B,C,D, 3);
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SHA_MIX( 4, 1, 12, 6); SHA_RND2(D,E,A,B,C, 4);
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SHA_MIX( 5, 2, 13, 7); SHA_RND2(C,D,E,A,B, 5);
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SHA_MIX( 6, 3, 14, 8); SHA_RND2(B,C,D,E,A, 6);
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SHA_MIX( 7, 4, 15, 9); SHA_RND2(A,B,C,D,E, 7);
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SHA_MIX( 8, 5, 0, 10); SHA_RND3(E,A,B,C,D, 8);
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SHA_MIX( 9, 6, 1, 11); SHA_RND3(D,E,A,B,C, 9);
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SHA_MIX(10, 7, 2, 12); SHA_RND3(C,D,E,A,B,10);
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SHA_MIX(11, 8, 3, 13); SHA_RND3(B,C,D,E,A,11);
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SHA_MIX(12, 9, 4, 14); SHA_RND3(A,B,C,D,E,12);
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SHA_MIX(13, 10, 5, 15); SHA_RND3(E,A,B,C,D,13);
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SHA_MIX(14, 11, 6, 0); SHA_RND3(D,E,A,B,C,14);
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SHA_MIX(15, 12, 7, 1); SHA_RND3(C,D,E,A,B,15);
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SHA_MIX( 0, 13, 8, 2); SHA_RND3(B,C,D,E,A, 0);
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SHA_MIX( 1, 14, 9, 3); SHA_RND3(A,B,C,D,E, 1);
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SHA_MIX( 2, 15, 10, 4); SHA_RND3(E,A,B,C,D, 2);
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SHA_MIX( 3, 0, 11, 5); SHA_RND3(D,E,A,B,C, 3);
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SHA_MIX( 4, 1, 12, 6); SHA_RND3(C,D,E,A,B, 4);
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SHA_MIX( 5, 2, 13, 7); SHA_RND3(B,C,D,E,A, 5);
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SHA_MIX( 6, 3, 14, 8); SHA_RND3(A,B,C,D,E, 6);
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SHA_MIX( 7, 4, 15, 9); SHA_RND3(E,A,B,C,D, 7);
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SHA_MIX( 8, 5, 0, 10); SHA_RND3(D,E,A,B,C, 8);
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SHA_MIX( 9, 6, 1, 11); SHA_RND3(C,D,E,A,B, 9);
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SHA_MIX(10, 7, 2, 12); SHA_RND3(B,C,D,E,A,10);
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SHA_MIX(11, 8, 3, 13); SHA_RND3(A,B,C,D,E,11);
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SHA_MIX(12, 9, 4, 14); SHA_RND4(E,A,B,C,D,12);
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SHA_MIX(13, 10, 5, 15); SHA_RND4(D,E,A,B,C,13);
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SHA_MIX(14, 11, 6, 0); SHA_RND4(C,D,E,A,B,14);
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SHA_MIX(15, 12, 7, 1); SHA_RND4(B,C,D,E,A,15);
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SHA_MIX( 0, 13, 8, 2); SHA_RND4(A,B,C,D,E, 0);
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SHA_MIX( 1, 14, 9, 3); SHA_RND4(E,A,B,C,D, 1);
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SHA_MIX( 2, 15, 10, 4); SHA_RND4(D,E,A,B,C, 2);
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SHA_MIX( 3, 0, 11, 5); SHA_RND4(C,D,E,A,B, 3);
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SHA_MIX( 4, 1, 12, 6); SHA_RND4(B,C,D,E,A, 4);
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SHA_MIX( 5, 2, 13, 7); SHA_RND4(A,B,C,D,E, 5);
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SHA_MIX( 6, 3, 14, 8); SHA_RND4(E,A,B,C,D, 6);
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SHA_MIX( 7, 4, 15, 9); SHA_RND4(D,E,A,B,C, 7);
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SHA_MIX( 8, 5, 0, 10); SHA_RND4(C,D,E,A,B, 8);
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SHA_MIX( 9, 6, 1, 11); SHA_RND4(B,C,D,E,A, 9);
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SHA_MIX(10, 7, 2, 12); SHA_RND4(A,B,C,D,E,10);
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SHA_MIX(11, 8, 3, 13); SHA_RND4(E,A,B,C,D,11);
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SHA_MIX(12, 9, 4, 14); SHA_RND4(D,E,A,B,C,12);
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SHA_MIX(13, 10, 5, 15); SHA_RND4(C,D,E,A,B,13);
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SHA_MIX(14, 11, 6, 0); SHA_RND4(B,C,D,E,A,14);
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SHA_MIX(15, 12, 7, 1); SHA_RND4(A,B,C,D,E,15);
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XH(0) += A;
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XH(1) += B;
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XH(2) += C;
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XH(3) += D;
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XH(4) += E;
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}
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