167 lines
No EOL
6.1 KiB
C
167 lines
No EOL
6.1 KiB
C
/*
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MIT License
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Copyright (c) 2020 LekKit https://github.com/LekKit
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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*/
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#include "wasm.h"
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struct lekkit_sha256_buff {
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uint64_t data_size;
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uint32_t h[8];
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uint8_t last_chunk[64];
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uint8_t chunk_size;
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};
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void lekkit_sha256_init(struct lekkit_sha256_buff* buff) {
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buff->h[0] = 0x6a09e667;
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buff->h[1] = 0xbb67ae85;
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buff->h[2] = 0x3c6ef372;
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buff->h[3] = 0xa54ff53a;
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buff->h[4] = 0x510e527f;
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buff->h[5] = 0x9b05688c;
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buff->h[6] = 0x1f83d9ab;
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buff->h[7] = 0x5be0cd19;
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buff->data_size = 0;
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buff->chunk_size = 0;
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}
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static const uint32_t lekkit_k[64] = {
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0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
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0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
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0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
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0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
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0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
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0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
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0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
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0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
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};
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#define rotate_r(val, bits) (val >> bits | val << (32 - bits))
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static void lekkit_sha256_calc_chunk(struct lekkit_sha256_buff* buff, const uint8_t* chunk) {
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uint32_t w[64];
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uint32_t tv[8];
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uint32_t i;
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for (i=0; i<16; ++i){
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w[i] = (uint32_t) chunk[0] << 24 | (uint32_t) chunk[1] << 16 | (uint32_t) chunk[2] << 8 | (uint32_t) chunk[3];
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chunk += 4;
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}
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for (i=16; i<64; ++i){
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uint32_t s0 = rotate_r(w[i-15], 7) ^ rotate_r(w[i-15], 18) ^ (w[i-15] >> 3);
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uint32_t s1 = rotate_r(w[i-2], 17) ^ rotate_r(w[i-2], 19) ^ (w[i-2] >> 10);
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w[i] = w[i-16] + s0 + w[i-7] + s1;
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}
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for (i = 0; i < 8; ++i)
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tv[i] = buff->h[i];
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for (i=0; i<64; ++i){
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uint32_t S1 = rotate_r(tv[4], 6) ^ rotate_r(tv[4], 11) ^ rotate_r(tv[4], 25);
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uint32_t ch = (tv[4] & tv[5]) ^ (~tv[4] & tv[6]);
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uint32_t temp1 = tv[7] + S1 + ch + lekkit_k[i] + w[i];
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uint32_t S0 = rotate_r(tv[0], 2) ^ rotate_r(tv[0], 13) ^ rotate_r(tv[0], 22);
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uint32_t maj = (tv[0] & tv[1]) ^ (tv[0] & tv[2]) ^ (tv[1] & tv[2]);
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uint32_t temp2 = S0 + maj;
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tv[7] = tv[6];
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tv[6] = tv[5];
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tv[5] = tv[4];
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tv[4] = tv[3] + temp1;
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tv[3] = tv[2];
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tv[2] = tv[1];
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tv[1] = tv[0];
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tv[0] = temp1 + temp2;
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}
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for (i = 0; i < 8; ++i)
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buff->h[i] += tv[i];
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}
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void lekkit_sha256_update(struct lekkit_sha256_buff* buff, const void* data, uint32_t size) {
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const uint8_t* ptr = (const uint8_t*)data;
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buff->data_size += size;
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/* If there is data left in buff, concatenate it to process as new chunk */
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if (size + buff->chunk_size >= 64) {
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uint8_t tmp_chunk[64];
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__builtin_memcpy(tmp_chunk, buff->last_chunk, buff->chunk_size);
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__builtin_memcpy(tmp_chunk + buff->chunk_size, ptr, 64 - buff->chunk_size);
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ptr += (64 - buff->chunk_size);
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size -= (64 - buff->chunk_size);
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buff->chunk_size = 0;
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lekkit_sha256_calc_chunk(buff, tmp_chunk);
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}
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/* Run over data chunks */
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while (size >= 64) {
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lekkit_sha256_calc_chunk(buff, ptr);
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ptr += 64;
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size -= 64;
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}
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/* Save remaining data in buff, will be reused on next call or finalize */
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__builtin_memcpy(buff->last_chunk + buff->chunk_size, ptr, size);
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buff->chunk_size += size;
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}
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void lekkit_sha256_finalize(struct lekkit_sha256_buff* buff) {
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buff->last_chunk[buff->chunk_size] = 0x80;
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buff->chunk_size++;
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__builtin_memset(buff->last_chunk + buff->chunk_size, 0, 64 - buff->chunk_size);
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/* If there isn't enough space to fit int64, pad chunk with zeroes and prepare next chunk */
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if (buff->chunk_size > 56) {
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lekkit_sha256_calc_chunk(buff, buff->last_chunk);
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__builtin_memset(buff->last_chunk, 0, 64);
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}
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/* Add total size as big-endian int64 x8 */
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uint64_t size = buff->data_size * 8;
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int i;
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for (i = 8; i > 0; --i) {
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buff->last_chunk[55+i] = size & 255;
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size >>= 8;
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}
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lekkit_sha256_calc_chunk(buff, buff->last_chunk);
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}
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void lekkit_sha256_read(const struct lekkit_sha256_buff* buff, uint8_t* hash) {
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uint32_t i;
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for (i = 0; i < 8; i++) {
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hash[i*4] = (buff->h[i] >> 24) & 255;
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hash[i*4 + 1] = (buff->h[i] >> 16) & 255;
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hash[i*4 + 2] = (buff->h[i] >> 8) & 255;
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hash[i*4 + 3] = buff->h[i] & 255;
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}
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}
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struct lekkit_sha256_buff lekkit_shared_ctx;
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WASM_EXPORT void sha256(const void* data, uint32_t size) {
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lekkit_sha256_init(&lekkit_shared_ctx);
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lekkit_sha256_update(&lekkit_shared_ctx, data, size);
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lekkit_sha256_finalize(&lekkit_shared_ctx);
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lekkit_sha256_read(&lekkit_shared_ctx, shared_out);
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}
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#undef rotate_r |