xref: /PHP-7.3/ext/hash/hash_snefru.c (revision 588db7ce)
1 /*
2   +----------------------------------------------------------------------+
3   | PHP Version 7                                                        |
4   +----------------------------------------------------------------------+
5   | Copyright (c) 1997-2018 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 #include "php_hash.h"
21 #include "php_hash_snefru.h"
22 #include "php_hash_snefru_tables.h"
23 
24 #define round(L, C, N, SB)	\
25 	SBE = SB[C & 0xff]; \
26 	L ^= SBE; \
27 	N ^= SBE
28 
29 #ifndef DBG_SNEFRU
30 #define DBG_SNEFRU 0
31 #endif
32 
33 #if DBG_SNEFRU
ph(uint32_t h[16])34 void ph(uint32_t h[16])
35 {
36 	int i;
37 	for (i = 0; i < 16; i++)
38 		printf ("%08lx", h[i]); printf("\n");
39 }
40 #endif
41 
Snefru(uint32_t input[16])42 static inline void Snefru(uint32_t input[16])
43 {
44 	static int shifts[4] = {16, 8, 16, 24};
45 	int b, index, rshift, lshift;
46 	const uint32_t *t0,*t1;
47 	uint32_t SBE,B00,B01,B02,B03,B04,B05,B06,B07,B08,B09,B10,B11,B12,B13,B14,B15;
48 
49 	B00 = input[0];
50 	B01 = input[1];
51 	B02 = input[2];
52 	B03 = input[3];
53 	B04 = input[4];
54 	B05 = input[5];
55 	B06 = input[6];
56 	B07 = input[7];
57 	B08 = input[8];
58 	B09 = input[9];
59 	B10 = input[10];
60 	B11 = input[11];
61 	B12 = input[12];
62 	B13 = input[13];
63 	B14 = input[14];
64 	B15 = input[15];
65 
66 	for (index = 0; index < 8; index++) {
67 		t0 = tables[2*index+0];
68 		t1 = tables[2*index+1];
69 		for (b = 0; b < 4; b++) {
70 			round(B15, B00, B01, t0);
71 			round(B00, B01, B02, t0);
72 			round(B01, B02, B03, t1);
73 			round(B02, B03, B04, t1);
74 			round(B03, B04, B05, t0);
75 			round(B04, B05, B06, t0);
76 			round(B05, B06, B07, t1);
77 			round(B06, B07, B08, t1);
78 			round(B07, B08, B09, t0);
79 			round(B08, B09, B10, t0);
80 			round(B09, B10, B11, t1);
81 			round(B10, B11, B12, t1);
82 			round(B11, B12, B13, t0);
83 			round(B12, B13, B14, t0);
84 			round(B13, B14, B15, t1);
85 			round(B14, B15, B00, t1);
86 
87 			rshift = shifts[b];
88 			lshift = 32-rshift;
89 
90 			B00 = (B00 >> rshift) | (B00 << lshift);
91 			B01 = (B01 >> rshift) | (B01 << lshift);
92 			B02 = (B02 >> rshift) | (B02 << lshift);
93 			B03 = (B03 >> rshift) | (B03 << lshift);
94 			B04 = (B04 >> rshift) | (B04 << lshift);
95 			B05 = (B05 >> rshift) | (B05 << lshift);
96 			B06 = (B06 >> rshift) | (B06 << lshift);
97 			B07 = (B07 >> rshift) | (B07 << lshift);
98 			B08 = (B08 >> rshift) | (B08 << lshift);
99 			B09 = (B09 >> rshift) | (B09 << lshift);
100 			B10 = (B10 >> rshift) | (B10 << lshift);
101 			B11 = (B11 >> rshift) | (B11 << lshift);
102 			B12 = (B12 >> rshift) | (B12 << lshift);
103 			B13 = (B13 >> rshift) | (B13 << lshift);
104 			B14 = (B14 >> rshift) | (B14 << lshift);
105 			B15 = (B15 >> rshift) | (B15 << lshift);
106 		}
107 	}
108 	input[0] ^= B15;
109 	input[1] ^= B14;
110 	input[2] ^= B13;
111 	input[3] ^= B12;
112 	input[4] ^= B11;
113 	input[5] ^= B10;
114 	input[6] ^= B09;
115 	input[7] ^= B08;
116 #if DBG_SNEFRU
117 	ph(input);
118 #endif
119 }
120 
SnefruTransform(PHP_SNEFRU_CTX * context,const unsigned char input[32])121 static inline void SnefruTransform(PHP_SNEFRU_CTX *context, const unsigned char input[32])
122 {
123 	int i, j;
124 
125 	for (i = 0, j = 0; i < 32; i += 4, ++j) {
126 		context->state[8+j] =	((input[i] & 0xff) << 24) | ((input[i+1] & 0xff) << 16) |
127 								((input[i+2] & 0xff) << 8) | (input[i+3] & 0xff);
128 	}
129 	Snefru(context->state);
130 	ZEND_SECURE_ZERO(&context->state[8], sizeof(uint32_t) * 8);
131 }
132 
PHP_SNEFRUInit(PHP_SNEFRU_CTX * context)133 PHP_HASH_API void PHP_SNEFRUInit(PHP_SNEFRU_CTX *context)
134 {
135 	memset(context, 0, sizeof(*context));
136 }
137 
138 static const uint32_t MAX32 = 0xffffffffLU;
139 
PHP_SNEFRUUpdate(PHP_SNEFRU_CTX * context,const unsigned char * input,size_t len)140 PHP_HASH_API void PHP_SNEFRUUpdate(PHP_SNEFRU_CTX *context, const unsigned char *input, size_t len)
141 {
142 	if ((MAX32 - context->count[1]) < (len * 8)) {
143 		context->count[0]++;
144 		context->count[1] = MAX32 - context->count[1];
145 		context->count[1] = (len * 8) - context->count[1];
146 	} else {
147 		context->count[1] += len * 8;
148 	}
149 
150 	if (context->length + len < 32) {
151 		memcpy(&context->buffer[context->length], input, len);
152 		context->length += (unsigned char)len;
153 	} else {
154 		size_t i = 0, r = (context->length + len) % 32;
155 
156 		if (context->length) {
157 			i = 32 - context->length;
158 			memcpy(&context->buffer[context->length], input, i);
159 			SnefruTransform(context, context->buffer);
160 		}
161 
162 		for (; i + 32 <= len; i += 32) {
163 			SnefruTransform(context, input + i);
164 		}
165 
166 		memcpy(context->buffer, input + i, r);
167 		ZEND_SECURE_ZERO(&context->buffer[r], 32 - r);
168 		context->length = (unsigned char)r;
169 	}
170 }
171 
PHP_SNEFRUFinal(unsigned char digest[32],PHP_SNEFRU_CTX * context)172 PHP_HASH_API void PHP_SNEFRUFinal(unsigned char digest[32], PHP_SNEFRU_CTX *context)
173 {
174 	uint32_t i, j;
175 
176 	if (context->length) {
177 		SnefruTransform(context, context->buffer);
178 	}
179 
180 	context->state[14] = context->count[0];
181 	context->state[15] = context->count[1];
182 	Snefru(context->state);
183 
184 	for (i = 0, j = 0; j < 32; i++, j += 4) {
185 		digest[j] = (unsigned char) ((context->state[i] >> 24) & 0xff);
186 		digest[j + 1] = (unsigned char) ((context->state[i] >> 16) & 0xff);
187 		digest[j + 2] = (unsigned char) ((context->state[i] >> 8) & 0xff);
188 		digest[j + 3] = (unsigned char) (context->state[i] & 0xff);
189 	}
190 
191 	ZEND_SECURE_ZERO(context, sizeof(*context));
192 }
193 
194 const php_hash_ops php_hash_snefru_ops = {
195 	(php_hash_init_func_t) PHP_SNEFRUInit,
196 	(php_hash_update_func_t) PHP_SNEFRUUpdate,
197 	(php_hash_final_func_t) PHP_SNEFRUFinal,
198 	(php_hash_copy_func_t) php_hash_copy,
199 	32,
200 	32,
201 	sizeof(PHP_SNEFRU_CTX),
202 	1
203 };
204 
205 /*
206  * Local variables:
207  * tab-width: 4
208  * c-basic-offset: 4
209  * End:
210  * vim600: sw=4 ts=4 fdm=marker
211  * vim<600: sw=4 ts=4
212  */
213