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76 lines
3.3 KiB
C
76 lines
3.3 KiB
C
/* Minimal standalone SHA-256 (FIPS 180-4). Verified against Python hashlib in
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* the test suite. Off the hot path (challenge generation only). */
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#include "sha256.h"
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#include <string.h>
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static uint32_t rotr(uint32_t x, uint32_t n) { return (x >> n) | (x << (32 - n)); }
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static const uint32_t K[64] = {
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0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1,
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0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
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0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, 0xe49b69c1, 0xefbe4786,
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0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
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0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147,
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0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
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0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85, 0xa2bfe8a1, 0xa81a664b,
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0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
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0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a,
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0x5b9cca4f, 0x682e6ff3, 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
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0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2};
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static void sha256_block(uint32_t state[8], const uint8_t block[64]) {
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uint32_t w[64];
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for (int i = 0; i < 16; i++)
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w[i] = ((uint32_t)block[i * 4] << 24) | ((uint32_t)block[i * 4 + 1] << 16) |
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((uint32_t)block[i * 4 + 2] << 8) | (uint32_t)block[i * 4 + 3];
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for (int i = 16; i < 64; i++) {
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uint32_t s0 = rotr(w[i - 15], 7) ^ rotr(w[i - 15], 18) ^ (w[i - 15] >> 3);
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uint32_t s1 = rotr(w[i - 2], 17) ^ rotr(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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uint32_t a = state[0], b = state[1], c = state[2], d = state[3];
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uint32_t e = state[4], f = state[5], g = state[6], h = state[7];
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for (int i = 0; i < 64; i++) {
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uint32_t S1 = rotr(e, 6) ^ rotr(e, 11) ^ rotr(e, 25);
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uint32_t ch = (e & f) ^ (~e & g);
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uint32_t t1 = h + S1 + ch + K[i] + w[i];
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uint32_t S0 = rotr(a, 2) ^ rotr(a, 13) ^ rotr(a, 22);
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uint32_t maj = (a & b) ^ (a & c) ^ (b & c);
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uint32_t t2 = S0 + maj;
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h = g; g = f; f = e; e = d + t1;
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d = c; c = b; b = a; a = t1 + t2;
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}
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state[0] += a; state[1] += b; state[2] += c; state[3] += d;
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state[4] += e; state[5] += f; state[6] += g; state[7] += h;
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}
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void sha256(const uint8_t *data, size_t len, uint8_t out[32]) {
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uint32_t state[8] = {0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a,
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0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19};
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size_t full = len / 64;
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for (size_t i = 0; i < full; i++)
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sha256_block(state, data + i * 64);
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/* Final block(s): remaining bytes, 0x80, zero pad, 64-bit big-endian length. */
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uint8_t buf[128];
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size_t rem = len - full * 64;
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memset(buf, 0, sizeof buf);
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memcpy(buf, data + full * 64, rem);
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buf[rem] = 0x80;
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size_t padlen = (rem < 56) ? 64 : 128;
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uint64_t bitlen = (uint64_t)len * 8;
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for (int i = 0; i < 8; i++)
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buf[padlen - 1 - i] = (uint8_t)(bitlen >> (8 * i));
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sha256_block(state, buf);
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if (padlen == 128)
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sha256_block(state, buf + 64);
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for (int i = 0; i < 8; i++) {
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out[i * 4] = (uint8_t)(state[i] >> 24);
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out[i * 4 + 1] = (uint8_t)(state[i] >> 16);
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out[i * 4 + 2] = (uint8_t)(state[i] >> 8);
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out[i * 4 + 3] = (uint8_t)(state[i]);
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}
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}
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