Annotation of embedaddon/php/ext/hash/hash_salsa.c, revision 1.1.1.1
1.1 misho 1: /*
2: +----------------------------------------------------------------------+
3: | PHP Version 5 |
4: +----------------------------------------------------------------------+
5: | Copyright (c) 1997-2012 The PHP Group |
6: +----------------------------------------------------------------------+
7: | This source file is subject to version 3.01 of the PHP license, |
8: | that is bundled with this package in the file LICENSE, and is |
9: | available through the world-wide-web at the following url: |
10: | http://www.php.net/license/3_01.txt |
11: | If you did not receive a copy of the PHP license and are unable to |
12: | obtain it through the world-wide-web, please send a note to |
13: | license@php.net so we can mail you a copy immediately. |
14: +----------------------------------------------------------------------+
15: | Authors: Michael Wallner <mike@php.net> |
16: | Sara Golemon <pollita@php.net> |
17: +----------------------------------------------------------------------+
18: */
19:
20: /* $Id: hash_salsa.c 321634 2012-01-01 13:15:04Z felipe $ */
21:
22: #include "php_hash.h"
23: #include "php_hash_salsa.h"
24:
25: #define R(a,b) (((a) << (b)) | ((a) >> (32 - (b))))
26:
27: /* {{{ Salsa10
28:
29: The 64-byte input x to Salsa10 is viewed in little-endian form as 16 integers
30: x0, x1, x2, ..., x15 in {0,1,...,2^32-1}. These 16 integers are fed through
31: 320 invertible modifications, where each modification changes one integer.
32: The modifications involve, overall,
33:
34: * 10 additions of constants modulo 2^32;
35: * 320 more additions modulo 2^32;
36: * 80 ``or'' operations;
37: * 240 ``xor'' operations; and
38: * 320 constant-distance rotations.
39:
40: The resulting 16 integers are added to the original x0, x1, x2, ..., x15
41: respectively modulo 2^32, producing, in little-endian form, the 64-byte output
42: Salsa10(x).
43:
44: D.J.Bernstein
45: */
46: static void Salsa10(php_hash_uint32 x[16], php_hash_uint32 in[16])
47: {
48: int i;
49:
50: for (i = 10; i > 0; --i) {
51: x[ 4] ^= R(x[ 0]+x[12], 6); x[ 8] ^= R(x[ 4]+x[ 0],17);
52: x[12] += R(x[ 8]|x[ 4],16); x[ 0] += R(x[12]^x[ 8], 5);
53: x[ 9] += R(x[ 5]|x[ 1], 8); x[13] += R(x[ 9]|x[ 5], 7);
54: x[ 1] ^= R(x[13]+x[ 9],17); x[ 5] += R(x[ 1]^x[13],12);
55: x[14] ^= R(x[10]+x[ 6], 7); x[ 2] += R(x[14]^x[10],15);
56: x[ 6] ^= R(x[ 2]+x[14],13); x[10] ^= R(x[ 6]+x[ 2],15);
57: x[ 3] += R(x[15]|x[11],20); x[ 7] ^= R(x[ 3]+x[15],16);
58: x[11] += R(x[ 7]^x[ 3], 7); x[15] += R(x[11]^x[ 7], 8);
59: x[ 1] += R(x[ 0]|x[ 3], 8)^i;x[ 2] ^= R(x[ 1]+x[ 0],14);
60: x[ 3] ^= R(x[ 2]+x[ 1], 6); x[ 0] += R(x[ 3]^x[ 2],18);
61: x[ 6] += R(x[ 5]^x[ 4], 8); x[ 7] += R(x[ 6]^x[ 5],12);
62: x[ 4] += R(x[ 7]|x[ 6],13); x[ 5] ^= R(x[ 4]+x[ 7],15);
63: x[11] ^= R(x[10]+x[ 9],18); x[ 8] += R(x[11]^x[10],11);
64: x[ 9] ^= R(x[ 8]+x[11], 8); x[10] += R(x[ 9]|x[ 8], 6);
65: x[12] += R(x[15]^x[14],17); x[13] ^= R(x[12]+x[15],15);
66: x[14] += R(x[13]|x[12], 9); x[15] += R(x[14]^x[13], 7);
67: }
68: for (i = 0; i < 16; ++i) {
69: x[i] += in[i];
70: }
71: }
72: /* }}} */
73:
74: /* {{{ Salsa20
75:
76: The 64-byte input x to Salsa20 is viewed in little-endian form as 16 words
77: x0, x1, x2, ..., x15 in {0,1,...,2^32-1}. These 16 words are fed through 320
78: invertible modifications, where each modification changes one word. The
79: resulting 16 words are added to the original x0, x1, x2, ..., x15 respectively
80: modulo 2^32, producing, in little-endian form, the 64-byte output Salsa20(x).
81:
82: Each modification involves xor'ing into one word a rotated version of the sum
83: of two other words modulo 2^32. Thus the 320 modifications involve, overall,
84: 320 additions, 320 xor's, and 320 rotations. The rotations are all by constant
85: distances.
86:
87: The entire series of modifications is a series of 10 identical double-rounds.
88: Each double-round is a series of 2 rounds. Each round is a set of 4 parallel
89: quarter-rounds. Each quarter-round modifies 4 words.
90:
91: D.J.Bernstein
92: */
93: static void Salsa20(php_hash_uint32 x[16], php_hash_uint32 in[16])
94: {
95: int i;
96:
97: for (i = 20; i > 0; i -= 2) {
98: x[ 4] ^= R(x[ 0]+x[12], 7); x[ 8] ^= R(x[ 4]+x[ 0], 9);
99: x[12] ^= R(x[ 8]+x[ 4],13); x[ 0] ^= R(x[12]+x[ 8],18);
100: x[ 9] ^= R(x[ 5]+x[ 1], 7); x[13] ^= R(x[ 9]+x[ 5], 9);
101: x[ 1] ^= R(x[13]+x[ 9],13); x[ 5] ^= R(x[ 1]+x[13],18);
102: x[14] ^= R(x[10]+x[ 6], 7); x[ 2] ^= R(x[14]+x[10], 9);
103: x[ 6] ^= R(x[ 2]+x[14],13); x[10] ^= R(x[ 6]+x[ 2],18);
104: x[ 3] ^= R(x[15]+x[11], 7); x[ 7] ^= R(x[ 3]+x[15], 9);
105: x[11] ^= R(x[ 7]+x[ 3],13); x[15] ^= R(x[11]+x[ 7],18);
106: x[ 1] ^= R(x[ 0]+x[ 3], 7); x[ 2] ^= R(x[ 1]+x[ 0], 9);
107: x[ 3] ^= R(x[ 2]+x[ 1],13); x[ 0] ^= R(x[ 3]+x[ 2],18);
108: x[ 6] ^= R(x[ 5]+x[ 4], 7); x[ 7] ^= R(x[ 6]+x[ 5], 9);
109: x[ 4] ^= R(x[ 7]+x[ 6],13); x[ 5] ^= R(x[ 4]+x[ 7],18);
110: x[11] ^= R(x[10]+x[ 9], 7); x[ 8] ^= R(x[11]+x[10], 9);
111: x[ 9] ^= R(x[ 8]+x[11],13); x[10] ^= R(x[ 9]+x[ 8],18);
112: x[12] ^= R(x[15]+x[14], 7); x[13] ^= R(x[12]+x[15], 9);
113: x[14] ^= R(x[13]+x[12],13); x[15] ^= R(x[14]+x[13],18);
114: }
115: for (i = 0; i < 16; ++i) {
116: x[i] += in[i];
117: }
118: }
119: /* }}} */
120:
121: static inline void SalsaTransform(PHP_SALSA_CTX *context, const unsigned char input[64])
122: {
123: php_hash_uint32 i, j, a[16];
124:
125: #if 0
126: fprintf(stderr, "> INPUT: %.*s\n", 64, input);
127: #endif
128:
129: for (i = 0, j = 0; j < 64; i++, j += 4) {
130: a[i] = ((php_hash_uint32) input[j + 3]) | (((php_hash_uint32) input[j + 2]) << 8) |
131: (((php_hash_uint32) input[j + 1]) << 16) | (((php_hash_uint32) input[j]) << 24);
132: }
133:
134: if (!context->init) {
135: memcpy(context->state, a, sizeof(a));
136: context->init = 1;
137: }
138:
139: context->Transform(context->state, a);
140: memset(a, 0, sizeof(a));
141: }
142:
143: PHP_HASH_API void PHP_SALSA10Init(PHP_SALSA_CTX *context)
144: {
145: memset(context, 0, sizeof(*context));
146: context->Transform = Salsa10;
147: }
148:
149: PHP_HASH_API void PHP_SALSA20Init(PHP_SALSA_CTX *context)
150: {
151: memset(context, 0, sizeof(*context));
152: context->Transform = Salsa20;
153: }
154:
155: PHP_HASH_API void PHP_SALSAUpdate(PHP_SALSA_CTX *context, const unsigned char *input, size_t len)
156: {
157: if (context->length + len < 64) {
158: memcpy(&context->buffer[context->length], input, len);
159: context->length += len;
160: } else {
161: size_t i = 0, r = (context->length + len) % 64;
162:
163: if (context->length) {
164: i = 64 - context->length;
165: memcpy(&context->buffer[context->length], input, i);
166: SalsaTransform(context, context->buffer);
167: memset(context->buffer, 0, 64);
168: }
169:
170: for (; i + 64 <= len; i += 64) {
171: SalsaTransform(context, input + i);
172: }
173:
174: memcpy(context->buffer, input + i, r);
175: context->length = r;
176: }
177: }
178:
179: PHP_HASH_API void PHP_SALSAFinal(unsigned char digest[64], PHP_SALSA_CTX *context)
180: {
181: php_hash_uint32 i, j;
182:
183: if (context->length) {
184: SalsaTransform(context, context->buffer);
185: }
186:
187: for (i = 0, j = 0; j < 64; i++, j += 4) {
188: digest[j] = (unsigned char) ((context->state[i] >> 24) & 0xff);
189: digest[j + 1] = (unsigned char) ((context->state[i] >> 16) & 0xff);
190: digest[j + 2] = (unsigned char) ((context->state[i] >> 8) & 0xff);
191: digest[j + 3] = (unsigned char) (context->state[i] & 0xff);
192: }
193:
194: memset(context, 0, sizeof(*context));
195: }
196:
197: const php_hash_ops php_hash_salsa10_ops = {
198: (php_hash_init_func_t) PHP_SALSA10Init,
199: (php_hash_update_func_t) PHP_SALSAUpdate,
200: (php_hash_final_func_t) PHP_SALSAFinal,
201: (php_hash_copy_func_t) php_hash_copy,
202: 64,
203: 64,
204: sizeof(PHP_SALSA_CTX)
205: };
206:
207: const php_hash_ops php_hash_salsa20_ops = {
208: (php_hash_init_func_t) PHP_SALSA20Init,
209: (php_hash_update_func_t) PHP_SALSAUpdate,
210: (php_hash_final_func_t) PHP_SALSAFinal,
211: (php_hash_copy_func_t) php_hash_copy,
212: 64,
213: 64,
214: sizeof(PHP_SALSA_CTX)
215: };
216:
217: /*
218: * Local variables:
219: * tab-width: 4
220: * c-basic-offset: 4
221: * End:
222: * vim600: sw=4 ts=4 fdm=marker
223: * vim<600: sw=4 ts=4
224: */
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