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Diffstat (limited to 'src/sha256.c')
| -rw-r--r-- | src/sha256.c | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/src/sha256.c b/src/sha256.c new file mode 100644 index 0000000..639185c --- /dev/null +++ b/src/sha256.c @@ -0,0 +1,139 @@ +/* + Copyright (c) 2012-2013, Matthias Schiffer <mschiffer@universe-factory.net> + All rights reserved. + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions are met: + + 1. Redistributions of source code must retain the above copyright notice, + this list of conditions and the following disclaimer. + 2. Redistributions in binary form must reproduce the above copyright notice, + this list of conditions and the following disclaimer in the documentation + and/or other materials provided with the distribution. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE + FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR + SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER + CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, + OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +*/ + + +#include "sha256.h" + +#include <stdarg.h> +#include <stdbool.h> +#include <string.h> + +#include <arpa/inet.h> + + +static inline uint32_t rotr(uint32_t x, int r) { + return (x >> r) | (x << (32-r)); +} + +void fastd_sha256_blocks(uint8_t out[FASTD_SHA256_HASH_BYTES], ...) { + static const uint32_t k[64] = { + 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5, + 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, + 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, + 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967, + 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85, + 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070, + 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3, + 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2 + }; + + uint32_t h[8] = { + 0x6a09e667, + 0xbb67ae85, + 0x3c6ef372, + 0xa54ff53a, + 0x510e527f, + 0x9b05688c, + 0x1f83d9ab, + 0x5be0cd19 + }; + unsigned count = 0, i; + va_list ap; + const uint32_t *in1, *in2; + + va_start(ap, out); + + do { + uint32_t w[64], v[8]; + + in1 = va_arg(ap, const uint32_t*); + + if (in1) { + count++; + in2 = va_arg(ap, const uint32_t*); + + if (in2) + count++; + } + else { + in2 = NULL; + } + + if (in1) { + for (i = 0; i < 8; i++) + w[i] = ntohl(in1[i]); + } + else { + w[0] = 0x80000000; + memset(w+1, 0, 7*sizeof(uint32_t)); + } + + if (in2) { + for (i = 0; i < 8; i++) + w[i+8] = ntohl(in2[i]); + } + else { + w[8] = in1 ? 0x80000000 : 0; + memset(w+9, 0, 6*sizeof(uint32_t)); + w[15] = count << 8; + } + + for (i = 16; i < 64; i++) { + uint32_t s0 = rotr(w[i-15], 7) ^ rotr(w[i-15], 18) ^ (w[i-15] >> 3); + uint32_t s1 = rotr(w[i-2], 17) ^ rotr(w[i-2], 19) ^ (w[i-2] >> 10); + w[i] = w[i-16] + s0 + w[i-7] + s1; + } + + memcpy(v, h, sizeof(v)); + + for (i = 0; i < 64; i++) { + uint32_t s1 = rotr(v[4], 6) ^ rotr(v[4], 11) ^ rotr(v[4], 25); + uint32_t ch = (v[4] & v[5]) ^ ((~v[4]) & v[6]); + uint32_t temp1 = v[7] + s1 + ch + k[i] + w[i]; + uint32_t s0 = rotr(v[0], 2) ^ rotr(v[0], 13) ^ rotr(v[0], 22); + uint32_t maj = (v[0] & v[1]) ^ (v[0] & v[2]) ^ (v[1] & v[2]); + uint32_t temp2 = s0 + maj; + + v[7] = v[6]; + v[6] = v[5]; + v[5] = v[4]; + v[4] = v[3] + temp1; + v[3] = v[2]; + v[2] = v[1]; + v[1] = v[0]; + v[0] = temp1 + temp2; + } + + for (i = 0; i < 8; i++) + h[i] += v[i]; + + } while (in1 && in2); + + va_end(ap); + + uint32_t *out32 = (uint32_t*)out; + for (i = 0; i < 8; i++) + out32[i] = htonl(h[i]); +} |