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Diffstat (limited to 'librhash/sha512.c')
| -rw-r--r-- | librhash/sha512.c | 255 |
1 files changed, 255 insertions, 0 deletions
diff --git a/librhash/sha512.c b/librhash/sha512.c new file mode 100644 index 0000000..a3e681d --- /dev/null +++ b/librhash/sha512.c @@ -0,0 +1,255 @@ +/* sha512.c - an implementation of SHA-384/512 hash functions + * based on FIPS 180-3 (Federal Information Processing Standart). + * + * Copyright: 2010-2012 Aleksey Kravchenko <rhash.admin@gmail.com> + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY + * or FITNESS FOR A PARTICULAR PURPOSE. Use this program at your own risk! + */ + +#include <string.h> +#include "byte_order.h" +#include "sha512.h" + +/* SHA-384 and SHA-512 constants for 80 rounds. These qwords represent + * the first 64 bits of the fractional parts of the cube + * roots of the first 80 prime numbers. */ +static const uint64_t rhash_k512[80] = { + I64(0x428a2f98d728ae22), I64(0x7137449123ef65cd), I64(0xb5c0fbcfec4d3b2f), + I64(0xe9b5dba58189dbbc), I64(0x3956c25bf348b538), I64(0x59f111f1b605d019), + I64(0x923f82a4af194f9b), I64(0xab1c5ed5da6d8118), I64(0xd807aa98a3030242), + I64(0x12835b0145706fbe), I64(0x243185be4ee4b28c), I64(0x550c7dc3d5ffb4e2), + I64(0x72be5d74f27b896f), I64(0x80deb1fe3b1696b1), I64(0x9bdc06a725c71235), + I64(0xc19bf174cf692694), I64(0xe49b69c19ef14ad2), I64(0xefbe4786384f25e3), + I64(0x0fc19dc68b8cd5b5), I64(0x240ca1cc77ac9c65), I64(0x2de92c6f592b0275), + I64(0x4a7484aa6ea6e483), I64(0x5cb0a9dcbd41fbd4), I64(0x76f988da831153b5), + I64(0x983e5152ee66dfab), I64(0xa831c66d2db43210), I64(0xb00327c898fb213f), + I64(0xbf597fc7beef0ee4), I64(0xc6e00bf33da88fc2), I64(0xd5a79147930aa725), + I64(0x06ca6351e003826f), I64(0x142929670a0e6e70), I64(0x27b70a8546d22ffc), + I64(0x2e1b21385c26c926), I64(0x4d2c6dfc5ac42aed), I64(0x53380d139d95b3df), + I64(0x650a73548baf63de), I64(0x766a0abb3c77b2a8), I64(0x81c2c92e47edaee6), + I64(0x92722c851482353b), I64(0xa2bfe8a14cf10364), I64(0xa81a664bbc423001), + I64(0xc24b8b70d0f89791), I64(0xc76c51a30654be30), I64(0xd192e819d6ef5218), + I64(0xd69906245565a910), I64(0xf40e35855771202a), I64(0x106aa07032bbd1b8), + I64(0x19a4c116b8d2d0c8), I64(0x1e376c085141ab53), I64(0x2748774cdf8eeb99), + I64(0x34b0bcb5e19b48a8), I64(0x391c0cb3c5c95a63), I64(0x4ed8aa4ae3418acb), + I64(0x5b9cca4f7763e373), I64(0x682e6ff3d6b2b8a3), I64(0x748f82ee5defb2fc), + I64(0x78a5636f43172f60), I64(0x84c87814a1f0ab72), I64(0x8cc702081a6439ec), + I64(0x90befffa23631e28), I64(0xa4506cebde82bde9), I64(0xbef9a3f7b2c67915), + I64(0xc67178f2e372532b), I64(0xca273eceea26619c), I64(0xd186b8c721c0c207), + I64(0xeada7dd6cde0eb1e), I64(0xf57d4f7fee6ed178), I64(0x06f067aa72176fba), + I64(0x0a637dc5a2c898a6), I64(0x113f9804bef90dae), I64(0x1b710b35131c471b), + I64(0x28db77f523047d84), I64(0x32caab7b40c72493), I64(0x3c9ebe0a15c9bebc), + I64(0x431d67c49c100d4c), I64(0x4cc5d4becb3e42b6), I64(0x597f299cfc657e2a), + I64(0x5fcb6fab3ad6faec), I64(0x6c44198c4a475817) +}; + +/* The SHA512/384 functions defined by FIPS 180-3, 4.1.3 */ +/* Optimized version of Ch(x,y,z)=((x & y) | (~x & z)) */ +#define Ch(x,y,z) ((z) ^ ((x) & ((y) ^ (z)))) +/* Optimized version of Maj(x,y,z)=((x & y) ^ (x & z) ^ (y & z)) */ +#define Maj(x,y,z) (((x) & (y)) ^ ((z) & ((x) ^ (y)))) + +#define Sigma0(x) (ROTR64((x), 28) ^ ROTR64((x), 34) ^ ROTR64((x), 39)) +#define Sigma1(x) (ROTR64((x), 14) ^ ROTR64((x), 18) ^ ROTR64((x), 41)) +#define sigma0(x) (ROTR64((x), 1) ^ ROTR64((x), 8) ^ ((x) >> 7)) +#define sigma1(x) (ROTR64((x), 19) ^ ROTR64((x), 61) ^ ((x) >> 6)) + +/* Recalculate element n-th of circular buffer W using formula + * W[n] = sigma1(W[n - 2]) + W[n - 7] + sigma0(W[n - 15]) + W[n - 16]; */ +#define RECALCULATE_W(W,n) (W[n] += \ + (sigma1(W[(n - 2) & 15]) + W[(n - 7) & 15] + sigma0(W[(n - 15) & 15]))) + +#define ROUND(a,b,c,d,e,f,g,h,k,data) { \ + uint64_t T1 = h + Sigma1(e) + Ch(e,f,g) + k + (data); \ + d += T1, h = T1 + Sigma0(a) + Maj(a,b,c); } +#define ROUND_1_16(a,b,c,d,e,f,g,h,n) \ + ROUND(a,b,c,d,e,f,g,h, rhash_k512[n], W[n] = be2me_64(block[n])) +#define ROUND_17_80(a,b,c,d,e,f,g,h,n) \ + ROUND(a,b,c,d,e,f,g,h, k[n], RECALCULATE_W(W, n)) + +/** + * Initialize context before calculating hash. + * + * @param ctx context to initialize + */ +void rhash_sha512_init(sha512_ctx *ctx) +{ + /* Initial values. These words were obtained by taking the first 32 + * bits of the fractional parts of the square roots of the first + * eight prime numbers. */ + static const uint64_t SHA512_H0[8] = { + I64(0x6a09e667f3bcc908), I64(0xbb67ae8584caa73b), I64(0x3c6ef372fe94f82b), + I64(0xa54ff53a5f1d36f1), I64(0x510e527fade682d1), I64(0x9b05688c2b3e6c1f), + I64(0x1f83d9abfb41bd6b), I64(0x5be0cd19137e2179) + }; + + ctx->length = 0; + ctx->digest_length = sha512_hash_size; + + /* initialize algorithm state */ + memcpy(ctx->hash, SHA512_H0, sizeof(ctx->hash)); +} + +/** + * Initialize context before calculaing hash. + * + * @param ctx context to initialize + */ +void rhash_sha384_init(struct sha512_ctx *ctx) +{ + /* Initial values from FIPS 180-3. These words were obtained by taking + * the first sixty-four bits of the fractional parts of the square + * roots of ninth through sixteenth prime numbers. */ + static const uint64_t SHA384_H0[8] = { + I64(0xcbbb9d5dc1059ed8), I64(0x629a292a367cd507), I64(0x9159015a3070dd17), + I64(0x152fecd8f70e5939), I64(0x67332667ffc00b31), I64(0x8eb44a8768581511), + I64(0xdb0c2e0d64f98fa7), I64(0x47b5481dbefa4fa4) + }; + + ctx->length = 0; + ctx->digest_length = sha384_hash_size; + + memcpy(ctx->hash, SHA384_H0, sizeof(ctx->hash)); +} + +/** + * The core transformation. Process a 512-bit block. + * + * @param hash algorithm state + * @param block the message block to process + */ +static void rhash_sha512_process_block(uint64_t hash[8], uint64_t block[16]) +{ + uint64_t A, B, C, D, E, F, G, H; + uint64_t W[16]; + const uint64_t *k; + int i; + + A = hash[0], B = hash[1], C = hash[2], D = hash[3]; + E = hash[4], F = hash[5], G = hash[6], H = hash[7]; + + /* Compute SHA using alternate Method: FIPS 180-3 6.1.3 */ + ROUND_1_16(A, B, C, D, E, F, G, H, 0); + ROUND_1_16(H, A, B, C, D, E, F, G, 1); + ROUND_1_16(G, H, A, B, C, D, E, F, 2); + ROUND_1_16(F, G, H, A, B, C, D, E, 3); + ROUND_1_16(E, F, G, H, A, B, C, D, 4); + ROUND_1_16(D, E, F, G, H, A, B, C, 5); + ROUND_1_16(C, D, E, F, G, H, A, B, 6); + ROUND_1_16(B, C, D, E, F, G, H, A, 7); + ROUND_1_16(A, B, C, D, E, F, G, H, 8); + ROUND_1_16(H, A, B, C, D, E, F, G, 9); + ROUND_1_16(G, H, A, B, C, D, E, F, 10); + ROUND_1_16(F, G, H, A, B, C, D, E, 11); + ROUND_1_16(E, F, G, H, A, B, C, D, 12); + ROUND_1_16(D, E, F, G, H, A, B, C, 13); + ROUND_1_16(C, D, E, F, G, H, A, B, 14); + ROUND_1_16(B, C, D, E, F, G, H, A, 15); + + for (i = 16, k = &rhash_k512[16]; i < 80; i += 16, k += 16) { + ROUND_17_80(A, B, C, D, E, F, G, H, 0); + ROUND_17_80(H, A, B, C, D, E, F, G, 1); + ROUND_17_80(G, H, A, B, C, D, E, F, 2); + ROUND_17_80(F, G, H, A, B, C, D, E, 3); + ROUND_17_80(E, F, G, H, A, B, C, D, 4); + ROUND_17_80(D, E, F, G, H, A, B, C, 5); + ROUND_17_80(C, D, E, F, G, H, A, B, 6); + ROUND_17_80(B, C, D, E, F, G, H, A, 7); + ROUND_17_80(A, B, C, D, E, F, G, H, 8); + ROUND_17_80(H, A, B, C, D, E, F, G, 9); + ROUND_17_80(G, H, A, B, C, D, E, F, 10); + ROUND_17_80(F, G, H, A, B, C, D, E, 11); + ROUND_17_80(E, F, G, H, A, B, C, D, 12); + ROUND_17_80(D, E, F, G, H, A, B, C, 13); + ROUND_17_80(C, D, E, F, G, H, A, B, 14); + ROUND_17_80(B, C, D, E, F, G, H, A, 15); + } + + hash[0] += A, hash[1] += B, hash[2] += C, hash[3] += D; + hash[4] += E, hash[5] += F, hash[6] += G, hash[7] += H; +} + +/** + * Calculate message hash. + * Can be called repeatedly with chunks of the message to be hashed. + * + * @param ctx the algorithm context containing current hashing state + * @param msg message chunk + * @param size length of the message chunk + */ +void rhash_sha512_update(sha512_ctx *ctx, const unsigned char *msg, size_t size) +{ + size_t index = (size_t)ctx->length & 127; + ctx->length += size; + + /* fill partial block */ + if (index) { + size_t left = sha512_block_size - index; + memcpy((char*)ctx->message + index, msg, (size < left ? size : left)); + if (size < left) return; + + /* process partial block */ + rhash_sha512_process_block(ctx->hash, ctx->message); + msg += left; + size -= left; + } + while (size >= sha512_block_size) { + uint64_t* aligned_message_block; + if (IS_ALIGNED_64(msg)) { + /* the most common case is processing of an already aligned message + without copying it */ + aligned_message_block = (uint64_t*)msg; + } else { + memcpy(ctx->message, msg, sha512_block_size); + aligned_message_block = ctx->message; + } + + rhash_sha512_process_block(ctx->hash, aligned_message_block); + msg += sha512_block_size; + size -= sha512_block_size; + } + if (size) { + memcpy(ctx->message, msg, size); /* save leftovers */ + } +} + +/** + * Store calculated hash into the given array. + * + * @param ctx the algorithm context containing current hashing state + * @param result calculated hash in binary form + */ +void rhash_sha512_final(sha512_ctx *ctx, unsigned char* result) +{ + size_t index = ((unsigned)ctx->length & 127) >> 3; + unsigned shift = ((unsigned)ctx->length & 7) * 8; + + /* pad message and process the last block */ + + /* append the byte 0x80 to the message */ + ctx->message[index] &= le2me_64( ~(I64(0xFFFFFFFFFFFFFFFF) << shift) ); + ctx->message[index++] ^= le2me_64( I64(0x80) << shift ); + + /* if no room left in the message to store 128-bit message length */ + if (index >= 15) { + if (index == 15) ctx->message[index] = 0; + rhash_sha512_process_block(ctx->hash, ctx->message); + index = 0; + } + while (index < 15) { + ctx->message[index++] = 0; + } + ctx->message[15] = be2me_64(ctx->length << 3); + rhash_sha512_process_block(ctx->hash, ctx->message); + + if (result) be64_copy(result, 0, ctx->hash, ctx->digest_length); +} |