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293 lines
6.1 KiB
293 lines
6.1 KiB
/* Copyright (c) 2014 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*
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* SHA-1 implementation largely based on libmincrypt in the the Android
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* Open Source Project (platorm/system/core.git/libmincrypt/sha.c
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*/
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#include "2sysincludes.h"
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#include "2common.h"
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#include "2sha.h"
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/*
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* Some machines lack byteswap.h and endian.h. These have to use the
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* slower code, even if they're little-endian.
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*/
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#if defined(HAVE_ENDIAN_H) && defined(HAVE_LITTLE_ENDIAN)
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/*
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* This version is about 28% faster than the generic version below,
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* but assumes little-endianness.
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*/
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static uint32_t ror27(uint32_t val)
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{
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return (val >> 27) | (val << 5);
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}
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static uint32_t ror2(uint32_t val)
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{
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return (val >> 2) | (val << 30);
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}
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static uint32_t ror31(uint32_t val)
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{
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return (val >> 31) | (val << 1);
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}
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static void sha1_transform(struct vb2_sha1_context *ctx)
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{
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/* Note that this array uses 80*4=320 bytes of stack */
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uint32_t W[80];
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register uint32_t A, B, C, D, E;
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int t;
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A = ctx->state[0];
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B = ctx->state[1];
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C = ctx->state[2];
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D = ctx->state[3];
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E = ctx->state[4];
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#define SHA_F1(A,B,C,D,E,t) \
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E += ror27(A) + \
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(W[t] = bswap_32(ctx->buf.w[t])) + \
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(D^(B&(C^D))) + 0x5A827999; \
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B = ror2(B);
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for (t = 0; t < 15; t += 5) {
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SHA_F1(A,B,C,D,E,t + 0);
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SHA_F1(E,A,B,C,D,t + 1);
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SHA_F1(D,E,A,B,C,t + 2);
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SHA_F1(C,D,E,A,B,t + 3);
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SHA_F1(B,C,D,E,A,t + 4);
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}
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SHA_F1(A,B,C,D,E,t + 0); /* 16th one, t == 15 */
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#undef SHA_F1
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#define SHA_F1(A,B,C,D,E,t) \
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E += ror27(A) + \
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(W[t] = ror31(W[t-3] ^ W[t-8] ^ W[t-14] ^ W[t-16])) + \
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(D^(B&(C^D))) + 0x5A827999; \
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B = ror2(B);
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SHA_F1(E,A,B,C,D,t + 1);
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SHA_F1(D,E,A,B,C,t + 2);
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SHA_F1(C,D,E,A,B,t + 3);
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SHA_F1(B,C,D,E,A,t + 4);
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#undef SHA_F1
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#define SHA_F2(A,B,C,D,E,t) \
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E += ror27(A) + \
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(W[t] = ror31(W[t-3] ^ W[t-8] ^ W[t-14] ^ W[t-16])) + \
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(B^C^D) + 0x6ED9EBA1; \
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B = ror2(B);
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for (t = 20; t < 40; t += 5) {
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SHA_F2(A,B,C,D,E,t + 0);
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SHA_F2(E,A,B,C,D,t + 1);
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SHA_F2(D,E,A,B,C,t + 2);
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SHA_F2(C,D,E,A,B,t + 3);
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SHA_F2(B,C,D,E,A,t + 4);
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}
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#undef SHA_F2
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#define SHA_F3(A,B,C,D,E,t) \
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E += ror27(A) + \
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(W[t] = ror31(W[t-3] ^ W[t-8] ^ W[t-14] ^ W[t-16])) + \
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((B&C)|(D&(B|C))) + 0x8F1BBCDC; \
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B = ror2(B);
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for (; t < 60; t += 5) {
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SHA_F3(A,B,C,D,E,t + 0);
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SHA_F3(E,A,B,C,D,t + 1);
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SHA_F3(D,E,A,B,C,t + 2);
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SHA_F3(C,D,E,A,B,t + 3);
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SHA_F3(B,C,D,E,A,t + 4);
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}
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#undef SHA_F3
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#define SHA_F4(A,B,C,D,E,t) \
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E += ror27(A) + \
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(W[t] = ror31(W[t-3] ^ W[t-8] ^ W[t-14] ^ W[t-16])) + \
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(B^C^D) + 0xCA62C1D6; \
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B = ror2(B);
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for (; t < 80; t += 5) {
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SHA_F4(A,B,C,D,E,t + 0);
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SHA_F4(E,A,B,C,D,t + 1);
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SHA_F4(D,E,A,B,C,t + 2);
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SHA_F4(C,D,E,A,B,t + 3);
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SHA_F4(B,C,D,E,A,t + 4);
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}
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#undef SHA_F4
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ctx->state[0] += A;
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ctx->state[1] += B;
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ctx->state[2] += C;
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ctx->state[3] += D;
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ctx->state[4] += E;
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}
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void vb2_sha1_update(struct vb2_sha1_context *ctx,
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const uint8_t *data,
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uint32_t size)
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{
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int i = ctx->count % sizeof(ctx->buf);
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const uint8_t *p = (const uint8_t*)data;
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ctx->count += size;
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while (size > sizeof(ctx->buf) - i) {
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memcpy(&ctx->buf.b[i], p, sizeof(ctx->buf) - i);
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size -= sizeof(ctx->buf) - i;
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p += sizeof(ctx->buf) - i;
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sha1_transform(ctx);
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i = 0;
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}
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while (size--) {
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ctx->buf.b[i++] = *p++;
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if (i == sizeof(ctx->buf)) {
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sha1_transform(ctx);
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i = 0;
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}
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}
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}
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uint8_t *vb2_sha1_finalize(struct vb2_sha1_context *ctx)
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{
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uint32_t cnt = ctx->count * 8;
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int i;
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vb2_sha1_update(ctx, (uint8_t*)"\x80", 1);
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while ((ctx->count % sizeof(ctx->buf)) != (sizeof(ctx->buf) - 8)) {
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vb2_sha1_update(ctx, (uint8_t*)"\0", 1);
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}
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for (i = 0; i < 8; ++i) {
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uint8_t tmp = cnt >> ((7 - i) * 8);
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vb2_sha1_update(ctx, &tmp, 1);
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}
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for (i = 0; i < 5; i++) {
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ctx->buf.w[i] = bswap_32(ctx->state[i]);
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}
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return ctx->buf.b;
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}
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#else /* #if defined(HAVE_ENDIAN_H) && defined(HAVE_LITTLE_ENDIAN) */
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#define rol(bits, value) (((value) << (bits)) | ((value) >> (32 - (bits))))
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static void sha1_transform(struct vb2_sha1_context *ctx)
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{
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/* Note that this array uses 80*4=320 bytes of stack */
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uint32_t W[80];
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uint32_t A, B, C, D, E;
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uint8_t *p = ctx->buf;
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int t;
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for(t = 0; t < 16; ++t) {
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uint32_t tmp = *p++ << 24;
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tmp |= *p++ << 16;
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tmp |= *p++ << 8;
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tmp |= *p++;
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W[t] = tmp;
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}
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for(; t < 80; t++) {
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W[t] = rol(1,W[t-3] ^ W[t-8] ^ W[t-14] ^ W[t-16]);
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}
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A = ctx->state[0];
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B = ctx->state[1];
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C = ctx->state[2];
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D = ctx->state[3];
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E = ctx->state[4];
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for(t = 0; t < 80; t++) {
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uint32_t tmp = rol(5,A) + E + W[t];
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if (t < 20)
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tmp += (D^(B&(C^D))) + 0x5A827999;
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else if ( t < 40)
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tmp += (B^C^D) + 0x6ED9EBA1;
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else if ( t < 60)
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tmp += ((B&C)|(D&(B|C))) + 0x8F1BBCDC;
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else
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tmp += (B^C^D) + 0xCA62C1D6;
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E = D;
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D = C;
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C = rol(30,B);
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B = A;
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A = tmp;
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}
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ctx->state[0] += A;
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ctx->state[1] += B;
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ctx->state[2] += C;
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ctx->state[3] += D;
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ctx->state[4] += E;
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}
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void vb2_sha1_update(struct vb2_sha1_context *ctx,
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const uint8_t *data,
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uint32_t size)
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{
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int i = (int)(ctx->count % sizeof(ctx->buf));
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const uint8_t* p = (const uint8_t*) data;
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ctx->count += size;
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while (size--) {
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ctx->buf[i++] = *p++;
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if (i == sizeof(ctx->buf)) {
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sha1_transform(ctx);
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i = 0;
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}
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}
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}
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void vb2_sha1_finalize(struct vb2_sha1_context *ctx, uint8_t *digest)
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{
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uint32_t cnt = ctx->count << 3;
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int i;
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vb2_sha1_update(ctx, (uint8_t*)"\x80", 1);
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while ((ctx->count % sizeof(ctx->buf)) != (sizeof(ctx->buf) - 8)) {
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vb2_sha1_update(ctx, (uint8_t*)"\0", 1);
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}
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for (i = 0; i < 8; ++i) {
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uint8_t tmp = (uint8_t)((uint64_t)cnt >> ((7 - i) * 8));
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vb2_sha1_update(ctx, &tmp, 1);
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}
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for (i = 0; i < 5; i++) {
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uint32_t tmp = ctx->state[i];
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*digest++ = (uint8_t)(tmp >> 24);
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*digest++ = (uint8_t)(tmp >> 16);
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*digest++ = (uint8_t)(tmp >> 8);
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*digest++ = (uint8_t)(tmp >> 0);
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}
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}
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#endif /* endianness */
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void vb2_sha1_init(struct vb2_sha1_context *ctx)
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{
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ctx->state[0] = 0x67452301;
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ctx->state[1] = 0xefcdab89;
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ctx->state[2] = 0x98badcfe;
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ctx->state[3] = 0x10325476;
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ctx->state[4] = 0xc3d2e1f0;
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ctx->count = 0;
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}
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