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7.0 refactor
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@@ -0,0 +1,257 @@
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/* Copyright(c) By Steve Reid <steve@edmweb.com> */
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/* 100% Public Domain */
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#include "sha1.h"
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#include <string.h>
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/*
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* clang with std=-c99 uses __LITTLE_ENDIAN, by default
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* while for ex, RTOS gcc - LITTLE_ENDIAN, by default
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* it depends on __USE_BSD, but let's have everything
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*/
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#if !defined(BYTE_ORDER) && defined(__BYTE_ORDER)
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#define BYTE_ORDER __BYTE_ORDER
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#ifndef LITTLE_ENDIAN
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#define LITTLE_ENDIAN __LITTLE_ENDIAN
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#endif /* LITTLE_ENDIAN */
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#ifndef BIG_ENDIAN
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#define BIG_ENDIAN __LITTLE_ENDIAN
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#endif /* BIG_ENDIAN */
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#endif /* BYTE_ORDER */
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union char64long16 {
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unsigned char c[64];
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uint32_t l[16];
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};
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#define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
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static uint32_t blk0(union char64long16 *block, int i) {
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/* Forrest: SHA expect BIG_ENDIAN, swap if LITTLE_ENDIAN */
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#if BYTE_ORDER == LITTLE_ENDIAN
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block->l[i] =
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(rol(block->l[i], 24) & 0xFF00FF00) | (rol(block->l[i], 8) & 0x00FF00FF);
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#endif
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return block->l[i];
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}
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/* Avoid redefine warning (ARM /usr/include/sys/ucontext.h define R0~R4) */
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#undef blk
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#undef R0
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#undef R1
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#undef R2
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#undef R3
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#undef R4
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#define blk(i) \
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(block->l[i & 15] = rol(block->l[(i + 13) & 15] ^ block->l[(i + 8) & 15] ^ \
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block->l[(i + 2) & 15] ^ block->l[i & 15], \
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1))
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#define R0(v, w, x, y, z, i) \
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z += ((w & (x ^ y)) ^ y) + blk0(block, i) + 0x5A827999 + rol(v, 5); \
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w = rol(w, 30);
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#define R1(v, w, x, y, z, i) \
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z += ((w & (x ^ y)) ^ y) + blk(i) + 0x5A827999 + rol(v, 5); \
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w = rol(w, 30);
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#define R2(v, w, x, y, z, i) \
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z += (w ^ x ^ y) + blk(i) + 0x6ED9EBA1 + rol(v, 5); \
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w = rol(w, 30);
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#define R3(v, w, x, y, z, i) \
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z += (((w | x) & y) | (w & x)) + blk(i) + 0x8F1BBCDC + rol(v, 5); \
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w = rol(w, 30);
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#define R4(v, w, x, y, z, i) \
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z += (w ^ x ^ y) + blk(i) + 0xCA62C1D6 + rol(v, 5); \
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w = rol(w, 30);
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void mg_sha1_transform(uint32_t state[5], const unsigned char buffer[64]) {
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uint32_t a, b, c, d, e;
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union char64long16 block[1];
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memcpy(block, buffer, 64);
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a = state[0];
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b = state[1];
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c = state[2];
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d = state[3];
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e = state[4];
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R0(a, b, c, d, e, 0);
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R0(e, a, b, c, d, 1);
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R0(d, e, a, b, c, 2);
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R0(c, d, e, a, b, 3);
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R0(b, c, d, e, a, 4);
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R0(a, b, c, d, e, 5);
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R0(e, a, b, c, d, 6);
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R0(d, e, a, b, c, 7);
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R0(c, d, e, a, b, 8);
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R0(b, c, d, e, a, 9);
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R0(a, b, c, d, e, 10);
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R0(e, a, b, c, d, 11);
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R0(d, e, a, b, c, 12);
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R0(c, d, e, a, b, 13);
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R0(b, c, d, e, a, 14);
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R0(a, b, c, d, e, 15);
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R1(e, a, b, c, d, 16);
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R1(d, e, a, b, c, 17);
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R1(c, d, e, a, b, 18);
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R1(b, c, d, e, a, 19);
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R2(a, b, c, d, e, 20);
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R2(e, a, b, c, d, 21);
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R2(d, e, a, b, c, 22);
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R2(c, d, e, a, b, 23);
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R2(b, c, d, e, a, 24);
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R2(a, b, c, d, e, 25);
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R2(e, a, b, c, d, 26);
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R2(d, e, a, b, c, 27);
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R2(c, d, e, a, b, 28);
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R2(b, c, d, e, a, 29);
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R2(a, b, c, d, e, 30);
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R2(e, a, b, c, d, 31);
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R2(d, e, a, b, c, 32);
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R2(c, d, e, a, b, 33);
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R2(b, c, d, e, a, 34);
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R2(a, b, c, d, e, 35);
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R2(e, a, b, c, d, 36);
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R2(d, e, a, b, c, 37);
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R2(c, d, e, a, b, 38);
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R2(b, c, d, e, a, 39);
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R3(a, b, c, d, e, 40);
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R3(e, a, b, c, d, 41);
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R3(d, e, a, b, c, 42);
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R3(c, d, e, a, b, 43);
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R3(b, c, d, e, a, 44);
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R3(a, b, c, d, e, 45);
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R3(e, a, b, c, d, 46);
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R3(d, e, a, b, c, 47);
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R3(c, d, e, a, b, 48);
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R3(b, c, d, e, a, 49);
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R3(a, b, c, d, e, 50);
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R3(e, a, b, c, d, 51);
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R3(d, e, a, b, c, 52);
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R3(c, d, e, a, b, 53);
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R3(b, c, d, e, a, 54);
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R3(a, b, c, d, e, 55);
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R3(e, a, b, c, d, 56);
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R3(d, e, a, b, c, 57);
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R3(c, d, e, a, b, 58);
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R3(b, c, d, e, a, 59);
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R4(a, b, c, d, e, 60);
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R4(e, a, b, c, d, 61);
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R4(d, e, a, b, c, 62);
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R4(c, d, e, a, b, 63);
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R4(b, c, d, e, a, 64);
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R4(a, b, c, d, e, 65);
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R4(e, a, b, c, d, 66);
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R4(d, e, a, b, c, 67);
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R4(c, d, e, a, b, 68);
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R4(b, c, d, e, a, 69);
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R4(a, b, c, d, e, 70);
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R4(e, a, b, c, d, 71);
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R4(d, e, a, b, c, 72);
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R4(c, d, e, a, b, 73);
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R4(b, c, d, e, a, 74);
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R4(a, b, c, d, e, 75);
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R4(e, a, b, c, d, 76);
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R4(d, e, a, b, c, 77);
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R4(c, d, e, a, b, 78);
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R4(b, c, d, e, a, 79);
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state[0] += a;
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state[1] += b;
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state[2] += c;
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state[3] += d;
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state[4] += e;
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/* Erase working structures. The order of operations is important,
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* used to ensure that compiler doesn't optimize those out. */
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memset(block, 0, sizeof(block));
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a = b = c = d = e = 0;
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(void) a;
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(void) b;
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(void) c;
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(void) d;
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(void) e;
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}
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void mg_sha1_init(mg_sha1_ctx *context) {
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context->state[0] = 0x67452301;
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context->state[1] = 0xEFCDAB89;
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context->state[2] = 0x98BADCFE;
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context->state[3] = 0x10325476;
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context->state[4] = 0xC3D2E1F0;
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context->count[0] = context->count[1] = 0;
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}
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void mg_sha1_update(mg_sha1_ctx *context, const unsigned char *data,
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size_t len) {
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size_t i, j;
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j = context->count[0];
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if ((context->count[0] += (uint32_t) len << 3) < j) context->count[1]++;
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context->count[1] += (uint32_t)(len >> 29);
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j = (j >> 3) & 63;
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if ((j + len) > 63) {
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memcpy(&context->buffer[j], data, (i = 64 - j));
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mg_sha1_transform(context->state, context->buffer);
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for (; i + 63 < len; i += 64) {
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mg_sha1_transform(context->state, &data[i]);
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}
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j = 0;
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} else
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i = 0;
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memcpy(&context->buffer[j], &data[i], len - i);
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}
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void mg_sha1_final(unsigned char digest[20], mg_sha1_ctx *context) {
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unsigned i;
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unsigned char finalcount[8], c;
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for (i = 0; i < 8; i++) {
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finalcount[i] = (unsigned char) ((context->count[(i >= 4 ? 0 : 1)] >>
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((3 - (i & 3)) * 8)) &
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255);
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}
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c = 0200;
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mg_sha1_update(context, &c, 1);
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while ((context->count[0] & 504) != 448) {
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c = 0000;
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mg_sha1_update(context, &c, 1);
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}
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mg_sha1_update(context, finalcount, 8);
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for (i = 0; i < 20; i++) {
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digest[i] =
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(unsigned char) ((context->state[i >> 2] >> ((3 - (i & 3)) * 8)) & 255);
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}
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memset(context, '\0', sizeof(*context));
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memset(&finalcount, '\0', sizeof(finalcount));
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}
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void mg_hmac_sha1(const unsigned char *key, size_t keylen,
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const unsigned char *data, size_t datalen,
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unsigned char out[20]) {
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mg_sha1_ctx ctx;
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unsigned char buf1[64], buf2[64], tmp_key[20], i;
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if (keylen > sizeof(buf1)) {
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mg_sha1_init(&ctx);
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mg_sha1_update(&ctx, key, keylen);
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mg_sha1_final(tmp_key, &ctx);
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key = tmp_key;
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keylen = sizeof(tmp_key);
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}
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memset(buf1, 0, sizeof(buf1));
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memset(buf2, 0, sizeof(buf2));
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memcpy(buf1, key, keylen);
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memcpy(buf2, key, keylen);
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for (i = 0; i < sizeof(buf1); i++) {
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buf1[i] ^= 0x36;
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buf2[i] ^= 0x5c;
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}
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mg_sha1_init(&ctx);
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mg_sha1_update(&ctx, buf1, sizeof(buf1));
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mg_sha1_update(&ctx, data, datalen);
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mg_sha1_final(out, &ctx);
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mg_sha1_init(&ctx);
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mg_sha1_update(&ctx, buf2, sizeof(buf2));
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mg_sha1_update(&ctx, out, 20);
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mg_sha1_final(out, &ctx);
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}
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