File: sha512.c

package info (click to toggle)
rhash 1.2.9-8%2Bdeb7u1
  • links: PTS, VCS
  • area: main
  • in suites: wheezy
  • size: 1,532 kB
  • sloc: ansic: 12,739; xml: 804; makefile: 626; java: 346; cs: 274; python: 226; perl: 173; sh: 147; ruby: 66; sed: 16
file content (252 lines) | stat: -rw-r--r-- 9,750 bytes parent folder | download
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
/* sha512.c - an implementation of SHA-384/512 hash functions
 * based on FIPS 180-3 (Federal Information Processing Standart).
 *
 * Copyright: 2010 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.
 */

#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 initalize
 */
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;
	/*unsigned *msg32 = (unsigned*)ctx->message;*/

	/* pad message and run for 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 64-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);
}