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comparison: libpurple/ciphers/sha256.c

libpurple/ciphers/sha256.c

changeset 34415
378c6f53452d
parent 34414
751567312cdd
parent 33724
b40615082e93
child 34416
95be3544aa84
equal deleted inserted replaced
34414:751567312cdd 34415:378c6f53452d
1 /*
2 * purple
3 *
4 * Purple is the legal property of its developers, whose names are too numerous
5 * to list here. Please refer to the COPYRIGHT file distributed with this
6 * source distribution.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111-1301 USA
21 */
22 #include <cipher.h>
23
24 #if !GLIB_CHECK_VERSION(2,16,0)
25
26 #define SHA256_HMAC_BLOCK_SIZE 64
27 #define SHA256_ROTR(X,n) ((((X) >> (n)) | ((X) << (32-(n)))) & 0xFFFFFFFF)
28
29 static const guint32 sha256_K[64] =
30 {
31 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
32 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
33 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
34 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
35 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
36 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
37 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
38 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
39 };
40
41 struct SHA256Context {
42 guint32 H[8];
43 guint32 W[64];
44
45 gint lenW;
46
47 guint32 sizeHi;
48 guint32 sizeLo;
49 };
50
51 static size_t
52 sha256_get_block_size(PurpleCipherContext *context)
53 {
54 /* This does not change (in this case) */
55 return SHA256_HMAC_BLOCK_SIZE;
56 }
57
58 static void
59 sha256_hash_block(struct SHA256Context *sha256_ctx) {
60 gint i;
61 guint32 A, B, C, D, E, F, G, H, T1, T2;
62
63 for(i = 16; i < 64; i++) {
64 sha256_ctx->W[i] =
65 (SHA256_ROTR(sha256_ctx->W[i-2], 17) ^ SHA256_ROTR(sha256_ctx->W[i-2], 19) ^ (sha256_ctx->W[i-2] >> 10))
66 + sha256_ctx->W[i-7]
67 + (SHA256_ROTR(sha256_ctx->W[i-15], 7) ^ SHA256_ROTR(sha256_ctx->W[i-15], 18) ^ (sha256_ctx->W[i-15] >> 3))
68 + sha256_ctx->W[i-16];
69 }
70
71 A = sha256_ctx->H[0];
72 B = sha256_ctx->H[1];
73 C = sha256_ctx->H[2];
74 D = sha256_ctx->H[3];
75 E = sha256_ctx->H[4];
76 F = sha256_ctx->H[5];
77 G = sha256_ctx->H[6];
78 H = sha256_ctx->H[7];
79
80 for(i = 0; i < 64; i++) {
81 T1 = H
82 + (SHA256_ROTR(E, 6) ^ SHA256_ROTR(E, 11) ^ SHA256_ROTR(E, 25))
83 + ((E & F) ^ ((~E) & G))
84 + sha256_K[i] + sha256_ctx->W[i];
85 T2 = (SHA256_ROTR(A, 2) ^ SHA256_ROTR(A, 13) ^ SHA256_ROTR(A, 22))
86 + ((A & B) ^ (A & C) ^ (B & C));
87 H = G;
88 G = F;
89 F = E;
90 E = D + T1;
91 D = C;
92 C = B;
93 B = A;
94 A = T1 + T2;
95 }
96
97 sha256_ctx->H[0] += A;
98 sha256_ctx->H[1] += B;
99 sha256_ctx->H[2] += C;
100 sha256_ctx->H[3] += D;
101 sha256_ctx->H[4] += E;
102 sha256_ctx->H[5] += F;
103 sha256_ctx->H[6] += G;
104 sha256_ctx->H[7] += H;
105 }
106
107 static void
108 sha256_set_opt(PurpleCipherContext *context, const gchar *name, void *value) {
109 struct SHA256Context *ctx;
110
111 ctx = purple_cipher_context_get_data(context);
112
113 if(!strcmp(name, "sizeHi")) {
114 ctx->sizeHi = GPOINTER_TO_INT(value);
115 } else if(!strcmp(name, "sizeLo")) {
116 ctx->sizeLo = GPOINTER_TO_INT(value);
117 } else if(!strcmp(name, "lenW")) {
118 ctx->lenW = GPOINTER_TO_INT(value);
119 }
120 }
121
122 static void *
123 sha256_get_opt(PurpleCipherContext *context, const gchar *name) {
124 struct SHA256Context *ctx;
125
126 ctx = purple_cipher_context_get_data(context);
127
128 if(!strcmp(name, "sizeHi")) {
129 return GINT_TO_POINTER(ctx->sizeHi);
130 } else if(!strcmp(name, "sizeLo")) {
131 return GINT_TO_POINTER(ctx->sizeLo);
132 } else if(!strcmp(name, "lenW")) {
133 return GINT_TO_POINTER(ctx->lenW);
134 }
135
136 return NULL;
137 }
138
139 static void
140 sha256_init(PurpleCipherContext *context, void *extra) {
141 struct SHA256Context *sha256_ctx;
142
143 sha256_ctx = g_new0(struct SHA256Context, 1);
144
145 purple_cipher_context_set_data(context, sha256_ctx);
146
147 purple_cipher_context_reset(context, extra);
148 }
149
150 static void
151 sha256_reset(PurpleCipherContext *context, void *extra) {
152 struct SHA256Context *sha256_ctx;
153 gint i;
154
155 sha256_ctx = purple_cipher_context_get_data(context);
156
157 g_return_if_fail(sha256_ctx);
158
159 sha256_ctx->lenW = 0;
160 sha256_ctx->sizeHi = 0;
161 sha256_ctx->sizeLo = 0;
162
163 sha256_ctx->H[0] = 0x6a09e667;
164 sha256_ctx->H[1] = 0xbb67ae85;
165 sha256_ctx->H[2] = 0x3c6ef372;
166 sha256_ctx->H[3] = 0xa54ff53a;
167 sha256_ctx->H[4] = 0x510e527f;
168 sha256_ctx->H[5] = 0x9b05688c;
169 sha256_ctx->H[6] = 0x1f83d9ab;
170 sha256_ctx->H[7] = 0x5be0cd19;
171
172 for(i = 0; i < 64; i++)
173 sha256_ctx->W[i] = 0;
174 }
175
176 static void
177 sha256_uninit(PurpleCipherContext *context) {
178 struct SHA256Context *sha256_ctx;
179
180 purple_cipher_context_reset(context, NULL);
181
182 sha256_ctx = purple_cipher_context_get_data(context);
183
184 memset(sha256_ctx, 0, sizeof(struct SHA256Context));
185
186 g_free(sha256_ctx);
187 sha256_ctx = NULL;
188 }
189
190 static void
191 sha256_append(PurpleCipherContext *context, const guchar *data, size_t len) {
192 struct SHA256Context *sha256_ctx;
193 gint i;
194
195 sha256_ctx = purple_cipher_context_get_data(context);
196
197 g_return_if_fail(sha256_ctx);
198
199 for(i = 0; i < len; i++) {
200 sha256_ctx->W[sha256_ctx->lenW / 4] <<= 8;
201 sha256_ctx->W[sha256_ctx->lenW / 4] |= data[i];
202
203 if((++sha256_ctx->lenW) % 64 == 0) {
204 sha256_hash_block(sha256_ctx);
205 sha256_ctx->lenW = 0;
206 }
207
208 sha256_ctx->sizeLo += 8;
209 sha256_ctx->sizeHi += (sha256_ctx->sizeLo < 8);
210 }
211 }
212
213 static gboolean
214 sha256_digest(PurpleCipherContext *context, size_t in_len, guchar digest[32],
215 size_t *out_len)
216 {
217 struct SHA256Context *sha256_ctx;
218 guchar pad0x80 = 0x80, pad0x00 = 0x00;
219 guchar padlen[8];
220 gint i;
221
222 g_return_val_if_fail(in_len >= 32, FALSE);
223
224 sha256_ctx = purple_cipher_context_get_data(context);
225
226 g_return_val_if_fail(sha256_ctx, FALSE);
227
228 padlen[0] = (guchar)((sha256_ctx->sizeHi >> 24) & 255);
229 padlen[1] = (guchar)((sha256_ctx->sizeHi >> 16) & 255);
230 padlen[2] = (guchar)((sha256_ctx->sizeHi >> 8) & 255);
231 padlen[3] = (guchar)((sha256_ctx->sizeHi >> 0) & 255);
232 padlen[4] = (guchar)((sha256_ctx->sizeLo >> 24) & 255);
233 padlen[5] = (guchar)((sha256_ctx->sizeLo >> 16) & 255);
234 padlen[6] = (guchar)((sha256_ctx->sizeLo >> 8) & 255);
235 padlen[7] = (guchar)((sha256_ctx->sizeLo >> 0) & 255);
236
237 /* pad with a 1, then zeroes, then length */
238 purple_cipher_context_append(context, &pad0x80, 1);
239 while(sha256_ctx->lenW != 56)
240 purple_cipher_context_append(context, &pad0x00, 1);
241 purple_cipher_context_append(context, padlen, 8);
242
243 for(i = 0; i < 32; i++) {
244 digest[i] = (guchar)(sha256_ctx->H[i / 4] >> 24);
245 sha256_ctx->H[i / 4] <<= 8;
246 }
247
248 purple_cipher_context_reset(context, NULL);
249
250 if(out_len)
251 *out_len = 32;
252
253 return TRUE;
254 }
255
256 static PurpleCipherOps SHA256Ops = {
257 sha256_set_opt, /* Set Option */
258 sha256_get_opt, /* Get Option */
259 sha256_init, /* init */
260 sha256_reset, /* reset */
261 sha256_uninit, /* uninit */
262 NULL, /* set iv */
263 sha256_append, /* append */
264 sha256_digest, /* digest */
265 NULL, /* encrypt */
266 NULL, /* decrypt */
267 NULL, /* set salt */
268 NULL, /* get salt size */
269 NULL, /* set key */
270 NULL, /* get key size */
271 NULL, /* set batch mode */
272 NULL, /* get batch mode */
273 sha256_get_block_size, /* get block size */
274 NULL /* set key with len */
275 };
276
277 PurpleCipherOps *
278 purple_sha256_cipher_get_ops(void) {
279 return &SHA256Ops;
280 }
281
282 #endif /* !GLIB_CHECK_VERSION(2,16,0) */
283

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