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feat(sha1): add SHA1 functions
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fallenoak
GitHub
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3 changed files with 269 additions and 0 deletions
192
common/SHA1.cpp
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192
common/SHA1.cpp
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#include "common/SHA1.hpp"
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#include <cstring>
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#define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
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#if defined(__BIG_ENDIAN__)
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#define blk0(i) block->l[i]
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#else
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#define blk0(i) (block->l[i] = (rol(block->l[i], 24) & 0xFF00FF00) | (rol(block->l[i], 8) & 0x00FF00FF))
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#endif
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#define blk(i) (block->l[i & 15] = rol(block->l[(i + 13) & 15] ^ block->l[(i + 8) & 15] ^ block->l[(i + 2) & 15] ^ block->l[i & 15], 1))
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#define R0(v, w, x, y, z, i) \
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z += ((w & (x ^ y)) ^ y) + blk0(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 SHA1_Final(uint8_t* const digest, SHA1_CONTEXT* context) {
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uint8_t finalcount[8];
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for (uint32_t i = 0; i < 8; i++) {
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finalcount[i] = static_cast<uint8_t>((context->count[(i >= 4 ? 0 : 1)] >> ((3 - (i & 3)) * 8)) & 255);
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}
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SHA1_Update(context, reinterpret_cast<const uint8_t*>("\200"), 1);
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while ((context->count[0] & 504) != 448) {
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SHA1_Update(context, reinterpret_cast<const uint8_t*>("\0"), 1);
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}
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SHA1_Update(context, finalcount, 8);
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for (uint32_t i = 0; i < SHA1_DIGEST_SIZE; i++) {
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digest[i] = static_cast<uint8_t>((context->state[i >> 2] >> ((3 - (i & 3)) * 8)) & 255);
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}
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memset(context->buffer, 0, sizeof(context->buffer));
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memset(context->state, 0, sizeof(context->state));
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memset(context->count, 0, sizeof(context->count));
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memset(finalcount, 0, sizeof(finalcount));
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}
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void SHA1_Init(SHA1_CONTEXT* 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] = 0;
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context->count[1] = 0;
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}
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void SHA1_Transform(uint32_t state[5], const uint8_t buffer[64]) {
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uint32_t a, b, c, d, e;
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typedef union {
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uint8_t c[64];
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uint32_t l[16];
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} CHAR64LONG16;
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CHAR64LONG16* block;
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block = reinterpret_cast<CHAR64LONG16*>(const_cast<uint8_t*>(buffer));
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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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}
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void SHA1_Update(SHA1_CONTEXT* context, const uint8_t* data, uint32_t len) {
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uint32_t i, j;
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j = (context->count[0] >> 3) & 63;
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if ((context->count[0] += len << 3) < (len << 3)) {
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context->count[1]++;
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}
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context->count[1] += (len >> 29);
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if ((j + len) > 63) {
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memcpy(&context->buffer[j], data, (i = 64 - j));
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SHA1_Transform(context->state, reinterpret_cast<uint8_t*>(context->buffer));
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for (; i + 63 < len; i += 64) {
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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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}
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memcpy(&context->buffer[j], &data[i], len - i);
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}
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20
common/SHA1.hpp
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20
common/SHA1.hpp
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#ifndef COMMON_SHA1_HPP
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#define COMMON_SHA1_HPP
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#include <cstdint>
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#define SHA1_DIGEST_SIZE 20
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typedef struct {
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uint32_t state[5];
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uint32_t count[2];
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char buffer[64];
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} SHA1_CONTEXT;
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void SHA1_Final(uint8_t* const digest, SHA1_CONTEXT* context);
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void SHA1_Init(SHA1_CONTEXT* context);
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void SHA1_Update(SHA1_CONTEXT* context, const uint8_t* data, uint32_t len);
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#endif
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