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256 lines
9.7 KiB
256 lines
9.7 KiB
/* sha512.c - an implementation of SHA-384/512 hash functions
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* based on FIPS 180-3 (Federal Information Processing Standart).
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*
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* Copyright (c) 2010, Aleksey Kravchenko <rhash.admin@gmail.com>
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
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* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
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* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
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* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <string.h>
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#include "byte_order.h"
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#include "sha512.h"
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/* SHA-384 and SHA-512 constants for 80 rounds. These qwords represent
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* the first 64 bits of the fractional parts of the cube
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* roots of the first 80 prime numbers. */
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static const uint64_t rhash_k512[80] = {
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I64(0x428a2f98d728ae22), I64(0x7137449123ef65cd), I64(0xb5c0fbcfec4d3b2f),
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I64(0xe9b5dba58189dbbc), I64(0x3956c25bf348b538), I64(0x59f111f1b605d019),
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I64(0x923f82a4af194f9b), I64(0xab1c5ed5da6d8118), I64(0xd807aa98a3030242),
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I64(0x12835b0145706fbe), I64(0x243185be4ee4b28c), I64(0x550c7dc3d5ffb4e2),
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I64(0x72be5d74f27b896f), I64(0x80deb1fe3b1696b1), I64(0x9bdc06a725c71235),
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I64(0xc19bf174cf692694), I64(0xe49b69c19ef14ad2), I64(0xefbe4786384f25e3),
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I64(0x0fc19dc68b8cd5b5), I64(0x240ca1cc77ac9c65), I64(0x2de92c6f592b0275),
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I64(0x4a7484aa6ea6e483), I64(0x5cb0a9dcbd41fbd4), I64(0x76f988da831153b5),
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I64(0x983e5152ee66dfab), I64(0xa831c66d2db43210), I64(0xb00327c898fb213f),
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I64(0xbf597fc7beef0ee4), I64(0xc6e00bf33da88fc2), I64(0xd5a79147930aa725),
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I64(0x06ca6351e003826f), I64(0x142929670a0e6e70), I64(0x27b70a8546d22ffc),
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I64(0x2e1b21385c26c926), I64(0x4d2c6dfc5ac42aed), I64(0x53380d139d95b3df),
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I64(0x650a73548baf63de), I64(0x766a0abb3c77b2a8), I64(0x81c2c92e47edaee6),
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I64(0x92722c851482353b), I64(0xa2bfe8a14cf10364), I64(0xa81a664bbc423001),
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I64(0xc24b8b70d0f89791), I64(0xc76c51a30654be30), I64(0xd192e819d6ef5218),
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I64(0xd69906245565a910), I64(0xf40e35855771202a), I64(0x106aa07032bbd1b8),
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I64(0x19a4c116b8d2d0c8), I64(0x1e376c085141ab53), I64(0x2748774cdf8eeb99),
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I64(0x34b0bcb5e19b48a8), I64(0x391c0cb3c5c95a63), I64(0x4ed8aa4ae3418acb),
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I64(0x5b9cca4f7763e373), I64(0x682e6ff3d6b2b8a3), I64(0x748f82ee5defb2fc),
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I64(0x78a5636f43172f60), I64(0x84c87814a1f0ab72), I64(0x8cc702081a6439ec),
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I64(0x90befffa23631e28), I64(0xa4506cebde82bde9), I64(0xbef9a3f7b2c67915),
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I64(0xc67178f2e372532b), I64(0xca273eceea26619c), I64(0xd186b8c721c0c207),
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I64(0xeada7dd6cde0eb1e), I64(0xf57d4f7fee6ed178), I64(0x06f067aa72176fba),
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I64(0x0a637dc5a2c898a6), I64(0x113f9804bef90dae), I64(0x1b710b35131c471b),
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I64(0x28db77f523047d84), I64(0x32caab7b40c72493), I64(0x3c9ebe0a15c9bebc),
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I64(0x431d67c49c100d4c), I64(0x4cc5d4becb3e42b6), I64(0x597f299cfc657e2a),
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I64(0x5fcb6fab3ad6faec), I64(0x6c44198c4a475817)
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};
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/* The SHA512/384 functions defined by FIPS 180-3, 4.1.3 */
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/* Optimized version of Ch(x,y,z)=((x & y) | (~x & z)) */
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#define Ch(x,y,z) ((z) ^ ((x) & ((y) ^ (z))))
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/* Optimized version of Maj(x,y,z)=((x & y) ^ (x & z) ^ (y & z)) */
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#define Maj(x,y,z) (((x) & (y)) ^ ((z) & ((x) ^ (y))))
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#define Sigma0(x) (ROTR64((x), 28) ^ ROTR64((x), 34) ^ ROTR64((x), 39))
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#define Sigma1(x) (ROTR64((x), 14) ^ ROTR64((x), 18) ^ ROTR64((x), 41))
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#define sigma0(x) (ROTR64((x), 1) ^ ROTR64((x), 8) ^ ((x) >> 7))
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#define sigma1(x) (ROTR64((x), 19) ^ ROTR64((x), 61) ^ ((x) >> 6))
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/* Recalculate element n-th of circular buffer W using formula
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* W[n] = sigma1(W[n - 2]) + W[n - 7] + sigma0(W[n - 15]) + W[n - 16]; */
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#define RECALCULATE_W(W,n) (W[n] += \
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(sigma1(W[(n - 2) & 15]) + W[(n - 7) & 15] + sigma0(W[(n - 15) & 15])))
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#define ROUND(a,b,c,d,e,f,g,h,k,data) { \
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uint64_t T1 = h + Sigma1(e) + Ch(e,f,g) + k + (data); \
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d += T1, h = T1 + Sigma0(a) + Maj(a,b,c); }
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#define ROUND_1_16(a,b,c,d,e,f,g,h,n) \
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ROUND(a,b,c,d,e,f,g,h, rhash_k512[n], W[n] = be2me_64(block[n]))
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#define ROUND_17_80(a,b,c,d,e,f,g,h,n) \
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ROUND(a,b,c,d,e,f,g,h, k[n], RECALCULATE_W(W, n))
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/**
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* Initialize context before calculating hash.
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*
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* @param ctx context to initialize
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*/
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void rhash_sha512_init(sha512_ctx* ctx)
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{
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/* Initial values. These words were obtained by taking the first 32
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* bits of the fractional parts of the square roots of the first
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* eight prime numbers. */
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static const uint64_t SHA512_H0[8] = {
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I64(0x6a09e667f3bcc908), I64(0xbb67ae8584caa73b), I64(0x3c6ef372fe94f82b),
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I64(0xa54ff53a5f1d36f1), I64(0x510e527fade682d1), I64(0x9b05688c2b3e6c1f),
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I64(0x1f83d9abfb41bd6b), I64(0x5be0cd19137e2179)
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};
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ctx->length = 0;
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ctx->digest_length = sha512_hash_size;
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/* initialize algorithm state */
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memcpy(ctx->hash, SHA512_H0, sizeof(ctx->hash));
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}
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/**
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* Initialize context before calculaing hash.
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*
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* @param ctx context to initialize
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*/
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void rhash_sha384_init(struct sha512_ctx* ctx)
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{
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/* Initial values from FIPS 180-3. These words were obtained by taking
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* the first sixty-four bits of the fractional parts of the square
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* roots of ninth through sixteenth prime numbers. */
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static const uint64_t SHA384_H0[8] = {
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I64(0xcbbb9d5dc1059ed8), I64(0x629a292a367cd507), I64(0x9159015a3070dd17),
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I64(0x152fecd8f70e5939), I64(0x67332667ffc00b31), I64(0x8eb44a8768581511),
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I64(0xdb0c2e0d64f98fa7), I64(0x47b5481dbefa4fa4)
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};
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ctx->length = 0;
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ctx->digest_length = sha384_hash_size;
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memcpy(ctx->hash, SHA384_H0, sizeof(ctx->hash));
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}
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/**
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* The core transformation. Process a 512-bit block.
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*
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* @param hash algorithm state
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* @param block the message block to process
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*/
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static void rhash_sha512_process_block(uint64_t hash[8], uint64_t block[16])
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{
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uint64_t A, B, C, D, E, F, G, H;
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uint64_t W[16];
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const uint64_t* k;
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int i;
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A = hash[0], B = hash[1], C = hash[2], D = hash[3];
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E = hash[4], F = hash[5], G = hash[6], H = hash[7];
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/* Compute SHA using alternate Method: FIPS 180-3 6.1.3 */
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ROUND_1_16(A, B, C, D, E, F, G, H, 0);
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ROUND_1_16(H, A, B, C, D, E, F, G, 1);
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ROUND_1_16(G, H, A, B, C, D, E, F, 2);
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ROUND_1_16(F, G, H, A, B, C, D, E, 3);
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ROUND_1_16(E, F, G, H, A, B, C, D, 4);
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ROUND_1_16(D, E, F, G, H, A, B, C, 5);
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ROUND_1_16(C, D, E, F, G, H, A, B, 6);
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ROUND_1_16(B, C, D, E, F, G, H, A, 7);
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ROUND_1_16(A, B, C, D, E, F, G, H, 8);
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ROUND_1_16(H, A, B, C, D, E, F, G, 9);
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ROUND_1_16(G, H, A, B, C, D, E, F, 10);
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ROUND_1_16(F, G, H, A, B, C, D, E, 11);
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ROUND_1_16(E, F, G, H, A, B, C, D, 12);
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ROUND_1_16(D, E, F, G, H, A, B, C, 13);
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ROUND_1_16(C, D, E, F, G, H, A, B, 14);
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ROUND_1_16(B, C, D, E, F, G, H, A, 15);
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for (i = 16, k = &rhash_k512[16]; i < 80; i += 16, k += 16) {
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ROUND_17_80(A, B, C, D, E, F, G, H, 0);
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ROUND_17_80(H, A, B, C, D, E, F, G, 1);
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ROUND_17_80(G, H, A, B, C, D, E, F, 2);
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ROUND_17_80(F, G, H, A, B, C, D, E, 3);
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ROUND_17_80(E, F, G, H, A, B, C, D, 4);
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ROUND_17_80(D, E, F, G, H, A, B, C, 5);
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ROUND_17_80(C, D, E, F, G, H, A, B, 6);
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ROUND_17_80(B, C, D, E, F, G, H, A, 7);
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ROUND_17_80(A, B, C, D, E, F, G, H, 8);
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ROUND_17_80(H, A, B, C, D, E, F, G, 9);
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ROUND_17_80(G, H, A, B, C, D, E, F, 10);
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ROUND_17_80(F, G, H, A, B, C, D, E, 11);
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ROUND_17_80(E, F, G, H, A, B, C, D, 12);
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ROUND_17_80(D, E, F, G, H, A, B, C, 13);
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ROUND_17_80(C, D, E, F, G, H, A, B, 14);
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ROUND_17_80(B, C, D, E, F, G, H, A, 15);
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}
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hash[0] += A, hash[1] += B, hash[2] += C, hash[3] += D;
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hash[4] += E, hash[5] += F, hash[6] += G, hash[7] += H;
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}
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/**
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* Calculate message hash.
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* Can be called repeatedly with chunks of the message to be hashed.
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*
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* @param ctx the algorithm context containing current hashing state
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* @param msg message chunk
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* @param size length of the message chunk
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*/
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void rhash_sha512_update(sha512_ctx* ctx, const unsigned char* msg, size_t size)
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{
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size_t index = (size_t)ctx->length & 127;
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ctx->length += size;
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/* fill partial block */
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if (index) {
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size_t left = sha512_block_size - index;
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memcpy((char*)ctx->message + index, msg, (size < left ? size : left));
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if (size < left) return;
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/* process partial block */
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rhash_sha512_process_block(ctx->hash, ctx->message);
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msg += left;
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size -= left;
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}
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while (size >= sha512_block_size) {
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uint64_t* aligned_message_block;
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if (IS_ALIGNED_64(msg)) {
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/* the most common case is processing of an already aligned message
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without copying it */
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aligned_message_block = (uint64_t*)msg;
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} else {
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memcpy(ctx->message, msg, sha512_block_size);
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aligned_message_block = ctx->message;
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}
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rhash_sha512_process_block(ctx->hash, aligned_message_block);
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msg += sha512_block_size;
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size -= sha512_block_size;
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}
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if (size) {
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memcpy(ctx->message, msg, size); /* save leftovers */
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}
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}
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/**
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* Store calculated hash into the given array.
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*
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* @param ctx the algorithm context containing current hashing state
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* @param result calculated hash in binary form
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*/
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void rhash_sha512_final(sha512_ctx* ctx, unsigned char* result)
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{
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size_t index = ((unsigned)ctx->length & 127) >> 3;
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unsigned shift = ((unsigned)ctx->length & 7) * 8;
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/* pad message and process the last block */
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/* append the byte 0x80 to the message */
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ctx->message[index] &= le2me_64( ~(I64(0xFFFFFFFFFFFFFFFF) << shift) );
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ctx->message[index++] ^= le2me_64( I64(0x80) << shift );
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/* if no room left in the message to store 128-bit message length */
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if (index >= 15) {
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if (index == 15) ctx->message[index] = 0;
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rhash_sha512_process_block(ctx->hash, ctx->message);
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index = 0;
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}
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while (index < 15) {
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ctx->message[index++] = 0;
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}
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ctx->message[15] = be2me_64(ctx->length << 3);
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rhash_sha512_process_block(ctx->hash, ctx->message);
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if (result) be64_copy(result, 0, ctx->hash, ctx->digest_length);
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}
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