mirror of
https://github.com/kazu-yamamoto/crypton.git
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176 lines
5.7 KiB
C
176 lines
5.7 KiB
C
/*
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* Copyright (C) 2006-2009 Vincent Hanquez <vincent@snarc.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <string.h>
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#include "cryptonite_sha256.h"
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#include "cryptonite_bitfn.h"
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void cryptonite_sha224_init(struct sha224_ctx *ctx)
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{
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memset(ctx, 0, sizeof(*ctx));
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ctx->h[0] = 0xc1059ed8;
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ctx->h[1] = 0x367cd507;
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ctx->h[2] = 0x3070dd17;
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ctx->h[3] = 0xf70e5939;
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ctx->h[4] = 0xffc00b31;
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ctx->h[5] = 0x68581511;
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ctx->h[6] = 0x64f98fa7;
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ctx->h[7] = 0xbefa4fa4;
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}
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void cryptonite_sha256_init(struct sha256_ctx *ctx)
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{
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memset(ctx, 0, sizeof(*ctx));
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ctx->h[0] = 0x6a09e667;
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ctx->h[1] = 0xbb67ae85;
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ctx->h[2] = 0x3c6ef372;
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ctx->h[3] = 0xa54ff53a;
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ctx->h[4] = 0x510e527f;
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ctx->h[5] = 0x9b05688c;
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ctx->h[6] = 0x1f83d9ab;
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ctx->h[7] = 0x5be0cd19;
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}
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/* 232 times the cube root of the first 64 primes 2..311 */
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static const uint32_t k[] = {
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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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};
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#define e0(x) (ror32(x, 2) ^ ror32(x,13) ^ ror32(x,22))
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#define e1(x) (ror32(x, 6) ^ ror32(x,11) ^ ror32(x,25))
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#define s0(x) (ror32(x, 7) ^ ror32(x,18) ^ (x >> 3))
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#define s1(x) (ror32(x,17) ^ ror32(x,19) ^ (x >> 10))
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static void sha256_do_chunk(struct sha256_ctx *ctx, uint32_t buf[])
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{
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uint32_t a, b, c, d, e, f, g, h, t1, t2;
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int i;
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uint32_t w[64];
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cpu_to_be32_array(w, buf, 16);
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for (i = 16; i < 64; i++)
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w[i] = s1(w[i - 2]) + w[i - 7] + s0(w[i - 15]) + w[i - 16];
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a = ctx->h[0]; b = ctx->h[1]; c = ctx->h[2]; d = ctx->h[3];
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e = ctx->h[4]; f = ctx->h[5]; g = ctx->h[6]; h = ctx->h[7];
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#define R(a, b, c, d, e, f, g, h, k, w) \
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t1 = h + e1(e) + (g ^ (e & (f ^ g))) + k + w; \
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t2 = e0(a) + ((a & b) | (c & (a | b))); \
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d += t1; \
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h = t1 + t2;
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for (i = 0; i < 64; i += 8) {
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R(a, b, c, d, e, f, g, h, k[i + 0], w[i + 0]);
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R(h, a, b, c, d, e, f, g, k[i + 1], w[i + 1]);
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R(g, h, a, b, c, d, e, f, k[i + 2], w[i + 2]);
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R(f, g, h, a, b, c, d, e, k[i + 3], w[i + 3]);
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R(e, f, g, h, a, b, c, d, k[i + 4], w[i + 4]);
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R(d, e, f, g, h, a, b, c, k[i + 5], w[i + 5]);
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R(c, d, e, f, g, h, a, b, k[i + 6], w[i + 6]);
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R(b, c, d, e, f, g, h, a, k[i + 7], w[i + 7]);
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}
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#undef R
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ctx->h[0] += a; ctx->h[1] += b; ctx->h[2] += c; ctx->h[3] += d;
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ctx->h[4] += e; ctx->h[5] += f; ctx->h[6] += g; ctx->h[7] += h;
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}
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void cryptonite_sha224_update(struct sha224_ctx *ctx, const uint8_t *data, uint32_t len)
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{
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return cryptonite_sha256_update(ctx, data, len);
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}
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void cryptonite_sha256_update(struct sha256_ctx *ctx, const uint8_t *data, uint32_t len)
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{
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uint32_t index, to_fill;
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/* check for partial buffer */
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index = (uint32_t) (ctx->sz & 0x3f);
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to_fill = 64 - index;
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ctx->sz += len;
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/* process partial buffer if there's enough data to make a block */
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if (index && len >= to_fill) {
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memcpy(ctx->buf + index, data, to_fill);
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sha256_do_chunk(ctx, (uint32_t *) ctx->buf);
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len -= to_fill;
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data += to_fill;
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index = 0;
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}
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/* process as much 64-block as possible */
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for (; len >= 64; len -= 64, data += 64)
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sha256_do_chunk(ctx, (uint32_t *) data);
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/* append data into buf */
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if (len)
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memcpy(ctx->buf + index, data, len);
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}
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void cryptonite_sha224_finalize(struct sha224_ctx *ctx, uint8_t *out)
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{
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uint8_t intermediate[SHA256_DIGEST_SIZE];
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cryptonite_sha256_finalize(ctx, intermediate);
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memcpy(out, intermediate, SHA224_DIGEST_SIZE);
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}
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void cryptonite_sha256_finalize(struct sha256_ctx *ctx, uint8_t *out)
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{
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static uint8_t padding[64] = { 0x80, };
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uint64_t bits;
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uint32_t i, index, padlen;
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uint32_t *p = (uint32_t *) out;
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/* cpu -> big endian */
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bits = cpu_to_be64(ctx->sz << 3);
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/* pad out to 56 */
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index = (uint32_t) (ctx->sz & 0x3f);
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padlen = (index < 56) ? (56 - index) : ((64 + 56) - index);
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cryptonite_sha256_update(ctx, padding, padlen);
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/* append length */
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cryptonite_sha256_update(ctx, (uint8_t *) &bits, sizeof(bits));
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/* store to digest */
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for (i = 0; i < 8; i++)
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p[i] = cpu_to_be32(ctx->h[i]);
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}
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