mirror of
https://github.com/trezor/trezor-firmware.git
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128 lines
4.0 KiB
C
128 lines
4.0 KiB
C
/**
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* Copyright (c) 2013 Tomas Dzetkulic
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* Copyright (c) 2013 Pavol Rusnak
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR 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
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES
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* OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <stdint.h>
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#include "aux.h"
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// process sha256 chunk (of length 64 bytes)
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void process_chunk(const uint8_t *chunk, uint32_t *hash)
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{
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static const uint32_t k0[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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uint32_t i, s0, s1, a, b, c, d, e, f, g, h, ch, temp, maj, w[64];
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for (i = 0; i < 16; i++) {
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w[i] = read_be(chunk + 4 * i);
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}
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for (; i < 64; i++) {
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s0 = ror(w[i-15], 7) ^ ror(w[i-15], 18) ^ (w[i-15]>>3);
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s1 = ror(w[i-2], 17) ^ ror(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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a = hash[0];
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b = hash[1];
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c = hash[2];
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d = hash[3];
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e = hash[4];
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f = hash[5];
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g = hash[6];
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h = hash[7];
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for (i = 0; i < 64; i++) {
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s1 = ror(e, 6) ^ ror(e, 11) ^ ror(e, 25);
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ch = (e & f) ^ ((~ e) & g);
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temp = h + s1 + ch + k0[i] + w[i];
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d = d + temp;
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s0 = ror(a, 2) ^ ror(a, 13) ^ ror(a, 22);
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maj = (a & (b ^ c)) ^ (b & c);
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temp = temp + s0 + maj;
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h = g;
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g = f;
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f = e;
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e = d;
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d = c;
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c = b;
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b = a;
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a = temp;
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}
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hash[0] += a;
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hash[1] += b;
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hash[2] += c;
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hash[3] += d;
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hash[4] += e;
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hash[5] += f;
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hash[6] += g;
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hash[7] += h;
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}
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// compute sha256 of a message with len length in bytes
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// hash is a pointer to at least 32byte array
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void sha256(const uint8_t *msg, const uint32_t len, uint8_t *hash)
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{
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// initial hash vales
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static const uint32_t h0[8] = {
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0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19
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};
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uint32_t l = len, i, h[8];
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uint8_t last_chunks[128]; //for storing last 1 or 2 chunks
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for (i = 0; i < 8; i++) {
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h[i] = h0[i];
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}
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// process complete message chunks
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while (l >= 64) {
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process_chunk(msg, h);
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l -= 64;
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msg += 64;
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}
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// process rest of the message
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for (i = 0; i < l; i++) {
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last_chunks[i] = msg[i];
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}
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// add '1' bit
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last_chunks[i++] = 0x80;
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// pad message with zeroes
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for (; (i & 63) != 56; i++) {
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last_chunks[i] = 0;
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}
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// add message length in bits
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l = 8 * len;
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write_be(last_chunks + i, 0);
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write_be(last_chunks + i + 4, l);
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// process remaining 1 or 2 chunks
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process_chunk(last_chunks, h);
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if (i > 64) {
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process_chunk(last_chunks + 64, h);
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}
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// write the result
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for (i = 0; i < 8; i++) {
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write_be(hash + 4 * i, h[i]);
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}
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}
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