1 /*
2 * Blowfish encryption/decryption for mISDN_dsp.
3 *
4 * Copyright Andreas Eversberg (jolly@eversberg.eu)
5 *
6 * This software may be used and distributed according to the terms
7 * of the GNU General Public License, incorporated herein by reference.
8 *
9 */
10
11 #include <linux/mISDNif.h>
12 #include <linux/mISDNdsp.h>
13 #include "core.h"
14 #include "dsp.h"
15
16 /*
17 * how to encode a sample stream to 64-bit blocks that will be encryped
18 *
19 * first of all, data is collected until a block of 9 samples are received.
20 * of course, a packet may have much more than 9 sample, but is may have
21 * not excacly the multiple of 9 samples. if there is a rest, the next
22 * received data will complete the block.
23 *
24 * the block is then converted to 9 uLAW samples without the least sigificant
25 * bit. the result is a 7-bit encoded sample.
26 *
27 * the samples will be reoganised to form 8 bytes of data:
28 * (5(6) means: encoded sample no. 5, bit 6)
29 *
30 * 0(6) 0(5) 0(4) 0(3) 0(2) 0(1) 0(0) 1(6)
31 * 1(5) 1(4) 1(3) 1(2) 1(1) 1(0) 2(6) 2(5)
32 * 2(4) 2(3) 2(2) 2(1) 2(0) 3(6) 3(5) 3(4)
33 * 3(3) 3(2) 3(1) 3(0) 4(6) 4(5) 4(4) 4(3)
34 * 4(2) 4(1) 4(0) 5(6) 5(5) 5(4) 5(3) 5(2)
35 * 5(1) 5(0) 6(6) 6(5) 6(4) 6(3) 6(2) 6(1)
36 * 6(0) 7(6) 7(5) 7(4) 7(3) 7(2) 7(1) 7(0)
37 * 8(6) 8(5) 8(4) 8(3) 8(2) 8(1) 8(0)
38 *
39 * the missing bit 0 of the last byte is filled with some
40 * random noise, to fill all 8 bytes.
41 *
42 * the 8 bytes will be encrypted using blowfish.
43 *
44 * the result will be converted into 9 bytes. the bit 7 is used for
45 * checksumme (CS) for sync (0, 1) and for the last bit:
46 * (5(6) means: crypted byte 5, bit 6)
47 *
48 * 1 0(7) 0(6) 0(5) 0(4) 0(3) 0(2) 0(1)
49 * 0 0(0) 1(7) 1(6) 1(5) 1(4) 1(3) 1(2)
50 * 0 1(1) 1(0) 2(7) 2(6) 2(5) 2(4) 2(3)
51 * 0 2(2) 2(1) 2(0) 3(7) 3(6) 3(5) 3(4)
52 * 0 3(3) 3(2) 3(1) 3(0) 4(7) 4(6) 4(5)
53 * CS 4(4) 4(3) 4(2) 4(1) 4(0) 5(7) 5(6)
54 * CS 5(5) 5(4) 5(3) 5(2) 5(1) 5(0) 6(7)
55 * CS 6(6) 6(5) 6(4) 6(3) 6(2) 6(1) 6(0)
56 * 7(0) 7(6) 7(5) 7(4) 7(3) 7(2) 7(1) 7(0)
57 *
58 * the checksum is used to detect transmission errors and frame drops.
59 *
60 * synchronisation of received block is done by shifting the upper bit of each
61 * byte (bit 7) to a shift register. if the rigister has the first five bits
62 * (10000), this is used to find the sync. only if sync has been found, the
63 * current block of 9 received bytes are decrypted. before that the check
64 * sum is calculated. if it is incorrect the block is dropped.
65 * this will avoid loud noise due to corrupt encrypted data.
66 *
67 * if the last block is corrupt, the current decoded block is repeated
68 * until a valid block has been received.
69 */
70
71 /*
72 * some blowfish parts are taken from the
73 * crypto-api for faster implementation
74 */
75
76 struct bf_ctx {
77 u32 p[18];
78 u32 s[1024];
79 };
80
81 static const u32 bf_pbox[16 + 2] = {
82 0x243f6a88, 0x85a308d3, 0x13198a2e, 0x03707344,
83 0xa4093822, 0x299f31d0, 0x082efa98, 0xec4e6c89,
84 0x452821e6, 0x38d01377, 0xbe5466cf, 0x34e90c6c,
85 0xc0ac29b7, 0xc97c50dd, 0x3f84d5b5, 0xb5470917,
86 0x9216d5d9, 0x8979fb1b,
87 };
88
89 static const u32 bf_sbox[256 * 4] = {
90 0xd1310ba6, 0x98dfb5ac, 0x2ffd72db, 0xd01adfb7,
91 0xb8e1afed, 0x6a267e96, 0xba7c9045, 0xf12c7f99,
92 0x24a19947, 0xb3916cf7, 0x0801f2e2, 0x858efc16,
93 0x636920d8, 0x71574e69, 0xa458fea3, 0xf4933d7e,
94 0x0d95748f, 0x728eb658, 0x718bcd58, 0x82154aee,
95 0x7b54a41d, 0xc25a59b5, 0x9c30d539, 0x2af26013,
96 0xc5d1b023, 0x286085f0, 0xca417918, 0xb8db38ef,
97 0x8e79dcb0, 0x603a180e, 0x6c9e0e8b, 0xb01e8a3e,
98 0xd71577c1, 0xbd314b27, 0x78af2fda, 0x55605c60,
99 0xe65525f3, 0xaa55ab94, 0x57489862, 0x63e81440,
100 0x55ca396a, 0x2aab10b6, 0xb4cc5c34, 0x1141e8ce,
101 0xa15486af, 0x7c72e993, 0xb3ee1411, 0x636fbc2a,
102 0x2ba9c55d, 0x741831f6, 0xce5c3e16, 0x9b87931e,
103 0xafd6ba33, 0x6c24cf5c, 0x7a325381, 0x28958677,
104 0x3b8f4898, 0x6b4bb9af, 0xc4bfe81b, 0x66282193,
105 0x61d809cc, 0xfb21a991, 0x487cac60, 0x5dec8032,
106 0xef845d5d, 0xe98575b1, 0xdc262302, 0xeb651b88,
107 0x23893e81, 0xd396acc5, 0x0f6d6ff3, 0x83f44239,
108 0x2e0b4482, 0xa4842004, 0x69c8f04a, 0x9e1f9b5e,
109 0x21c66842, 0xf6e96c9a, 0x670c9c61, 0xabd388f0,
110 0x6a51a0d2, 0xd8542f68, 0x960fa728, 0xab5133a3,
111 0x6eef0b6c, 0x137a3be4, 0xba3bf050, 0x7efb2a98,
112 0xa1f1651d, 0x39af0176, 0x66ca593e, 0x82430e88,
113 0x8cee8619, 0x456f9fb4, 0x7d84a5c3, 0x3b8b5ebe,
114 0xe06f75d8, 0x85c12073, 0x401a449f, 0x56c16aa6,
115 0x4ed3aa62, 0x363f7706, 0x1bfedf72, 0x429b023d,
116 0x37d0d724, 0xd00a1248, 0xdb0fead3, 0x49f1c09b,
117 0x075372c9, 0x80991b7b, 0x25d479d8, 0xf6e8def7,
118 0xe3fe501a, 0xb6794c3b, 0x976ce0bd, 0x04c006ba,
119 0xc1a94fb6, 0x409f60c4, 0x5e5c9ec2, 0x196a2463,
120 0x68fb6faf, 0x3e6c53b5, 0x1339b2eb, 0x3b52ec6f,
121 0x6dfc511f, 0x9b30952c, 0xcc814544, 0xaf5ebd09,
122 0xbee3d004, 0xde334afd, 0x660f2807, 0x192e4bb3,
123 0xc0cba857, 0x45c8740f, 0xd20b5f39, 0xb9d3fbdb,
124 0x5579c0bd, 0x1a60320a, 0xd6a100c6, 0x402c7279,
125 0x679f25fe, 0xfb1fa3cc, 0x8ea5e9f8, 0xdb3222f8,
126 0x3c7516df, 0xfd616b15, 0x2f501ec8, 0xad0552ab,
127 0x323db5fa, 0xfd238760, 0x53317b48, 0x3e00df82,
128 0x9e5c57bb, 0xca6f8ca0, 0x1a87562e, 0xdf1769db,
129 0xd542a8f6, 0x287effc3, 0xac6732c6, 0x8c4f5573,
130 0x695b27b0, 0xbbca58c8, 0xe1ffa35d, 0xb8f011a0,
131 0x10fa3d98, 0xfd2183b8, 0x4afcb56c, 0x2dd1d35b,
132 0x9a53e479, 0xb6f84565, 0xd28e49bc, 0x4bfb9790,
133 0xe1ddf2da, 0xa4cb7e33, 0x62fb1341, 0xcee4c6e8,
134 0xef20cada, 0x36774c01, 0xd07e9efe, 0x2bf11fb4,
135 0x95dbda4d, 0xae909198, 0xeaad8e71, 0x6b93d5a0,
136 0xd08ed1d0, 0xafc725e0, 0x8e3c5b2f, 0x8e7594b7,
137 0x8ff6e2fb, 0xf2122b64, 0x8888b812, 0x900df01c,
138 0x4fad5ea0, 0x688fc31c, 0xd1cff191, 0xb3a8c1ad,
139 0x2f2f2218, 0xbe0e1777, 0xea752dfe, 0x8b021fa1,
140 0xe5a0cc0f, 0xb56f74e8, 0x18acf3d6, 0xce89e299,
141 0xb4a84fe0, 0xfd13e0b7, 0x7cc43b81, 0xd2ada8d9,
142 0x165fa266, 0x80957705, 0x93cc7314, 0x211a1477,
143 0xe6ad2065, 0x77b5fa86, 0xc75442f5, 0xfb9d35cf,
144 0xebcdaf0c, 0x7b3e89a0, 0xd6411bd3, 0xae1e7e49,
145 0x00250e2d, 0x2071b35e, 0x226800bb, 0x57b8e0af,
146 0x2464369b, 0xf009b91e, 0x5563911d, 0x59dfa6aa,
147 0x78c14389, 0xd95a537f, 0x207d5ba2, 0x02e5b9c5,
148 0x83260376, 0x6295cfa9, 0x11c81968, 0x4e734a41,
149 0xb3472dca, 0x7b14a94a, 0x1b510052, 0x9a532915,
150 0xd60f573f, 0xbc9bc6e4, 0x2b60a476, 0x81e67400,
151 0x08ba6fb5, 0x571be91f, 0xf296ec6b, 0x2a0dd915,
152 0xb6636521, 0xe7b9f9b6, 0xff34052e, 0xc5855664,
153 0x53b02d5d, 0xa99f8fa1, 0x08ba4799, 0x6e85076a,
154 0x4b7a70e9, 0xb5b32944, 0xdb75092e, 0xc4192623,
155 0xad6ea6b0, 0x49a7df7d, 0x9cee60b8, 0x8fedb266,
156 0xecaa8c71, 0x699a17ff, 0x5664526c, 0xc2b19ee1,
157 0x193602a5, 0x75094c29, 0xa0591340, 0xe4183a3e,
158 0x3f54989a, 0x5b429d65, 0x6b8fe4d6, 0x99f73fd6,
159 0xa1d29c07, 0xefe830f5, 0x4d2d38e6, 0xf0255dc1,
160 0x4cdd2086, 0x8470eb26, 0x6382e9c6, 0x021ecc5e,
161 0x09686b3f, 0x3ebaefc9, 0x3c971814, 0x6b6a70a1,
162 0x687f3584, 0x52a0e286, 0xb79c5305, 0xaa500737,
163 0x3e07841c, 0x7fdeae5c, 0x8e7d44ec, 0x5716f2b8,
164 0xb03ada37, 0xf0500c0d, 0xf01c1f04, 0x0200b3ff,
165 0xae0cf51a, 0x3cb574b2, 0x25837a58, 0xdc0921bd,
166 0xd19113f9, 0x7ca92ff6, 0x94324773, 0x22f54701,
167 0x3ae5e581, 0x37c2dadc, 0xc8b57634, 0x9af3dda7,
168 0xa9446146, 0x0fd0030e, 0xecc8c73e, 0xa4751e41,
169 0xe238cd99, 0x3bea0e2f, 0x3280bba1, 0x183eb331,
170 0x4e548b38, 0x4f6db908, 0x6f420d03, 0xf60a04bf,
171 0x2cb81290, 0x24977c79, 0x5679b072, 0xbcaf89af,
172 0xde9a771f, 0xd9930810, 0xb38bae12, 0xdccf3f2e,
173 0x5512721f, 0x2e6b7124, 0x501adde6, 0x9f84cd87,
174 0x7a584718, 0x7408da17, 0xbc9f9abc, 0xe94b7d8c,
175 0xec7aec3a, 0xdb851dfa, 0x63094366, 0xc464c3d2,
176 0xef1c1847, 0x3215d908, 0xdd433b37, 0x24c2ba16,
177 0x12a14d43, 0x2a65c451, 0x50940002, 0x133ae4dd,
178 0x71dff89e, 0x10314e55, 0x81ac77d6, 0x5f11199b,
179 0x043556f1, 0xd7a3c76b, 0x3c11183b, 0x5924a509,
180 0xf28fe6ed, 0x97f1fbfa, 0x9ebabf2c, 0x1e153c6e,
181 0x86e34570, 0xeae96fb1, 0x860e5e0a, 0x5a3e2ab3,
182 0x771fe71c, 0x4e3d06fa, 0x2965dcb9, 0x99e71d0f,
183 0x803e89d6, 0x5266c825, 0x2e4cc978, 0x9c10b36a,
184 0xc6150eba, 0x94e2ea78, 0xa5fc3c53, 0x1e0a2df4,
185 0xf2f74ea7, 0x361d2b3d, 0x1939260f, 0x19c27960,
186 0x5223a708, 0xf71312b6, 0xebadfe6e, 0xeac31f66,
187 0xe3bc4595, 0xa67bc883, 0xb17f37d1, 0x018cff28,
188 0xc332ddef, 0xbe6c5aa5, 0x65582185, 0x68ab9802,
189 0xeecea50f, 0xdb2f953b, 0x2aef7dad, 0x5b6e2f84,
190 0x1521b628, 0x29076170, 0xecdd4775, 0x619f1510,
191 0x13cca830, 0xeb61bd96, 0x0334fe1e, 0xaa0363cf,
192 0xb5735c90, 0x4c70a239, 0xd59e9e0b, 0xcbaade14,
193 0xeecc86bc, 0x60622ca7, 0x9cab5cab, 0xb2f3846e,
194 0x648b1eaf, 0x19bdf0ca, 0xa02369b9, 0x655abb50,
195 0x40685a32, 0x3c2ab4b3, 0x319ee9d5, 0xc021b8f7,
196 0x9b540b19, 0x875fa099, 0x95f7997e, 0x623d7da8,
197 0xf837889a, 0x97e32d77, 0x11ed935f, 0x16681281,
198 0x0e358829, 0xc7e61fd6, 0x96dedfa1, 0x7858ba99,
199 0x57f584a5, 0x1b227263, 0x9b83c3ff, 0x1ac24696,
200 0xcdb30aeb, 0x532e3054, 0x8fd948e4, 0x6dbc3128,
201 0x58ebf2ef, 0x34c6ffea, 0xfe28ed61, 0xee7c3c73,
202 0x5d4a14d9, 0xe864b7e3, 0x42105d14, 0x203e13e0,
203 0x45eee2b6, 0xa3aaabea, 0xdb6c4f15, 0xfacb4fd0,
204 0xc742f442, 0xef6abbb5, 0x654f3b1d, 0x41cd2105,
205 0xd81e799e, 0x86854dc7, 0xe44b476a, 0x3d816250,
206 0xcf62a1f2, 0x5b8d2646, 0xfc8883a0, 0xc1c7b6a3,
207 0x7f1524c3, 0x69cb7492, 0x47848a0b, 0x5692b285,
208 0x095bbf00, 0xad19489d, 0x1462b174, 0x23820e00,
209 0x58428d2a, 0x0c55f5ea, 0x1dadf43e, 0x233f7061,
210 0x3372f092, 0x8d937e41, 0xd65fecf1, 0x6c223bdb,
211 0x7cde3759, 0xcbee7460, 0x4085f2a7, 0xce77326e,
212 0xa6078084, 0x19f8509e, 0xe8efd855, 0x61d99735,
213 0xa969a7aa, 0xc50c06c2, 0x5a04abfc, 0x800bcadc,
214 0x9e447a2e, 0xc3453484, 0xfdd56705, 0x0e1e9ec9,
215 0xdb73dbd3, 0x105588cd, 0x675fda79, 0xe3674340,
216 0xc5c43465, 0x713e38d8, 0x3d28f89e, 0xf16dff20,
217 0x153e21e7, 0x8fb03d4a, 0xe6e39f2b, 0xdb83adf7,
218 0xe93d5a68, 0x948140f7, 0xf64c261c, 0x94692934,
219 0x411520f7, 0x7602d4f7, 0xbcf46b2e, 0xd4a20068,
220 0xd4082471, 0x3320f46a, 0x43b7d4b7, 0x500061af,
221 0x1e39f62e, 0x97244546, 0x14214f74, 0xbf8b8840,
222 0x4d95fc1d, 0x96b591af, 0x70f4ddd3, 0x66a02f45,
223 0xbfbc09ec, 0x03bd9785, 0x7fac6dd0, 0x31cb8504,
224 0x96eb27b3, 0x55fd3941, 0xda2547e6, 0xabca0a9a,
225 0x28507825, 0x530429f4, 0x0a2c86da, 0xe9b66dfb,
226 0x68dc1462, 0xd7486900, 0x680ec0a4, 0x27a18dee,
227 0x4f3ffea2, 0xe887ad8c, 0xb58ce006, 0x7af4d6b6,
228 0xaace1e7c, 0xd3375fec, 0xce78a399, 0x406b2a42,
229 0x20fe9e35, 0xd9f385b9, 0xee39d7ab, 0x3b124e8b,
230 0x1dc9faf7, 0x4b6d1856, 0x26a36631, 0xeae397b2,
231 0x3a6efa74, 0xdd5b4332, 0x6841e7f7, 0xca7820fb,
232 0xfb0af54e, 0xd8feb397, 0x454056ac, 0xba489527,
233 0x55533a3a, 0x20838d87, 0xfe6ba9b7, 0xd096954b,
234 0x55a867bc, 0xa1159a58, 0xcca92963, 0x99e1db33,
235 0xa62a4a56, 0x3f3125f9, 0x5ef47e1c, 0x9029317c,
236 0xfdf8e802, 0x04272f70, 0x80bb155c, 0x05282ce3,
237 0x95c11548, 0xe4c66d22, 0x48c1133f, 0xc70f86dc,
238 0x07f9c9ee, 0x41041f0f, 0x404779a4, 0x5d886e17,
239 0x325f51eb, 0xd59bc0d1, 0xf2bcc18f, 0x41113564,
240 0x257b7834, 0x602a9c60, 0xdff8e8a3, 0x1f636c1b,
241 0x0e12b4c2, 0x02e1329e, 0xaf664fd1, 0xcad18115,
242 0x6b2395e0, 0x333e92e1, 0x3b240b62, 0xeebeb922,
243 0x85b2a20e, 0xe6ba0d99, 0xde720c8c, 0x2da2f728,
244 0xd0127845, 0x95b794fd, 0x647d0862, 0xe7ccf5f0,
245 0x5449a36f, 0x877d48fa, 0xc39dfd27, 0xf33e8d1e,
246 0x0a476341, 0x992eff74, 0x3a6f6eab, 0xf4f8fd37,
247 0xa812dc60, 0xa1ebddf8, 0x991be14c, 0xdb6e6b0d,
248 0xc67b5510, 0x6d672c37, 0x2765d43b, 0xdcd0e804,
249 0xf1290dc7, 0xcc00ffa3, 0xb5390f92, 0x690fed0b,
250 0x667b9ffb, 0xcedb7d9c, 0xa091cf0b, 0xd9155ea3,
251 0xbb132f88, 0x515bad24, 0x7b9479bf, 0x763bd6eb,
252 0x37392eb3, 0xcc115979, 0x8026e297, 0xf42e312d,
253 0x6842ada7, 0xc66a2b3b, 0x12754ccc, 0x782ef11c,
254 0x6a124237, 0xb79251e7, 0x06a1bbe6, 0x4bfb6350,
255 0x1a6b1018, 0x11caedfa, 0x3d25bdd8, 0xe2e1c3c9,
256 0x44421659, 0x0a121386, 0xd90cec6e, 0xd5abea2a,
257 0x64af674e, 0xda86a85f, 0xbebfe988, 0x64e4c3fe,
258 0x9dbc8057, 0xf0f7c086, 0x60787bf8, 0x6003604d,
259 0xd1fd8346, 0xf6381fb0, 0x7745ae04, 0xd736fccc,
260 0x83426b33, 0xf01eab71, 0xb0804187, 0x3c005e5f,
261 0x77a057be, 0xbde8ae24, 0x55464299, 0xbf582e61,
262 0x4e58f48f, 0xf2ddfda2, 0xf474ef38, 0x8789bdc2,
263 0x5366f9c3, 0xc8b38e74, 0xb475f255, 0x46fcd9b9,
264 0x7aeb2661, 0x8b1ddf84, 0x846a0e79, 0x915f95e2,
265 0x466e598e, 0x20b45770, 0x8cd55591, 0xc902de4c,
266 0xb90bace1, 0xbb8205d0, 0x11a86248, 0x7574a99e,
267 0xb77f19b6, 0xe0a9dc09, 0x662d09a1, 0xc4324633,
268 0xe85a1f02, 0x09f0be8c, 0x4a99a025, 0x1d6efe10,
269 0x1ab93d1d, 0x0ba5a4df, 0xa186f20f, 0x2868f169,
270 0xdcb7da83, 0x573906fe, 0xa1e2ce9b, 0x4fcd7f52,
271 0x50115e01, 0xa70683fa, 0xa002b5c4, 0x0de6d027,
272 0x9af88c27, 0x773f8641, 0xc3604c06, 0x61a806b5,
273 0xf0177a28, 0xc0f586e0, 0x006058aa, 0x30dc7d62,
274 0x11e69ed7, 0x2338ea63, 0x53c2dd94, 0xc2c21634,
275 0xbbcbee56, 0x90bcb6de, 0xebfc7da1, 0xce591d76,
276 0x6f05e409, 0x4b7c0188, 0x39720a3d, 0x7c927c24,
277 0x86e3725f, 0x724d9db9, 0x1ac15bb4, 0xd39eb8fc,
278 0xed545578, 0x08fca5b5, 0xd83d7cd3, 0x4dad0fc4,
279 0x1e50ef5e, 0xb161e6f8, 0xa28514d9, 0x6c51133c,
280 0x6fd5c7e7, 0x56e14ec4, 0x362abfce, 0xddc6c837,
281 0xd79a3234, 0x92638212, 0x670efa8e, 0x406000e0,
282 0x3a39ce37, 0xd3faf5cf, 0xabc27737, 0x5ac52d1b,
283 0x5cb0679e, 0x4fa33742, 0xd3822740, 0x99bc9bbe,
284 0xd5118e9d, 0xbf0f7315, 0xd62d1c7e, 0xc700c47b,
285 0xb78c1b6b, 0x21a19045, 0xb26eb1be, 0x6a366eb4,
286 0x5748ab2f, 0xbc946e79, 0xc6a376d2, 0x6549c2c8,
287 0x530ff8ee, 0x468dde7d, 0xd5730a1d, 0x4cd04dc6,
288 0x2939bbdb, 0xa9ba4650, 0xac9526e8, 0xbe5ee304,
289 0xa1fad5f0, 0x6a2d519a, 0x63ef8ce2, 0x9a86ee22,
290 0xc089c2b8, 0x43242ef6, 0xa51e03aa, 0x9cf2d0a4,
291 0x83c061ba, 0x9be96a4d, 0x8fe51550, 0xba645bd6,
292 0x2826a2f9, 0xa73a3ae1, 0x4ba99586, 0xef5562e9,
293 0xc72fefd3, 0xf752f7da, 0x3f046f69, 0x77fa0a59,
294 0x80e4a915, 0x87b08601, 0x9b09e6ad, 0x3b3ee593,
295 0xe990fd5a, 0x9e34d797, 0x2cf0b7d9, 0x022b8b51,
296 0x96d5ac3a, 0x017da67d, 0xd1cf3ed6, 0x7c7d2d28,
297 0x1f9f25cf, 0xadf2b89b, 0x5ad6b472, 0x5a88f54c,
298 0xe029ac71, 0xe019a5e6, 0x47b0acfd, 0xed93fa9b,
299 0xe8d3c48d, 0x283b57cc, 0xf8d56629, 0x79132e28,
300 0x785f0191, 0xed756055, 0xf7960e44, 0xe3d35e8c,
301 0x15056dd4, 0x88f46dba, 0x03a16125, 0x0564f0bd,
302 0xc3eb9e15, 0x3c9057a2, 0x97271aec, 0xa93a072a,
303 0x1b3f6d9b, 0x1e6321f5, 0xf59c66fb, 0x26dcf319,
304 0x7533d928, 0xb155fdf5, 0x03563482, 0x8aba3cbb,
305 0x28517711, 0xc20ad9f8, 0xabcc5167, 0xccad925f,
306 0x4de81751, 0x3830dc8e, 0x379d5862, 0x9320f991,
307 0xea7a90c2, 0xfb3e7bce, 0x5121ce64, 0x774fbe32,
308 0xa8b6e37e, 0xc3293d46, 0x48de5369, 0x6413e680,
309 0xa2ae0810, 0xdd6db224, 0x69852dfd, 0x09072166,
310 0xb39a460a, 0x6445c0dd, 0x586cdecf, 0x1c20c8ae,
311 0x5bbef7dd, 0x1b588d40, 0xccd2017f, 0x6bb4e3bb,
312 0xdda26a7e, 0x3a59ff45, 0x3e350a44, 0xbcb4cdd5,
313 0x72eacea8, 0xfa6484bb, 0x8d6612ae, 0xbf3c6f47,
314 0xd29be463, 0x542f5d9e, 0xaec2771b, 0xf64e6370,
315 0x740e0d8d, 0xe75b1357, 0xf8721671, 0xaf537d5d,
316 0x4040cb08, 0x4eb4e2cc, 0x34d2466a, 0x0115af84,
317 0xe1b00428, 0x95983a1d, 0x06b89fb4, 0xce6ea048,
318 0x6f3f3b82, 0x3520ab82, 0x011a1d4b, 0x277227f8,
319 0x611560b1, 0xe7933fdc, 0xbb3a792b, 0x344525bd,
320 0xa08839e1, 0x51ce794b, 0x2f32c9b7, 0xa01fbac9,
321 0xe01cc87e, 0xbcc7d1f6, 0xcf0111c3, 0xa1e8aac7,
322 0x1a908749, 0xd44fbd9a, 0xd0dadecb, 0xd50ada38,
323 0x0339c32a, 0xc6913667, 0x8df9317c, 0xe0b12b4f,
324 0xf79e59b7, 0x43f5bb3a, 0xf2d519ff, 0x27d9459c,
325 0xbf97222c, 0x15e6fc2a, 0x0f91fc71, 0x9b941525,
326 0xfae59361, 0xceb69ceb, 0xc2a86459, 0x12baa8d1,
327 0xb6c1075e, 0xe3056a0c, 0x10d25065, 0xcb03a442,
328 0xe0ec6e0e, 0x1698db3b, 0x4c98a0be, 0x3278e964,
329 0x9f1f9532, 0xe0d392df, 0xd3a0342b, 0x8971f21e,
330 0x1b0a7441, 0x4ba3348c, 0xc5be7120, 0xc37632d8,
331 0xdf359f8d, 0x9b992f2e, 0xe60b6f47, 0x0fe3f11d,
332 0xe54cda54, 0x1edad891, 0xce6279cf, 0xcd3e7e6f,
333 0x1618b166, 0xfd2c1d05, 0x848fd2c5, 0xf6fb2299,
334 0xf523f357, 0xa6327623, 0x93a83531, 0x56cccd02,
335 0xacf08162, 0x5a75ebb5, 0x6e163697, 0x88d273cc,
336 0xde966292, 0x81b949d0, 0x4c50901b, 0x71c65614,
337 0xe6c6c7bd, 0x327a140a, 0x45e1d006, 0xc3f27b9a,
338 0xc9aa53fd, 0x62a80f00, 0xbb25bfe2, 0x35bdd2f6,
339 0x71126905, 0xb2040222, 0xb6cbcf7c, 0xcd769c2b,
340 0x53113ec0, 0x1640e3d3, 0x38abbd60, 0x2547adf0,
341 0xba38209c, 0xf746ce76, 0x77afa1c5, 0x20756060,
342 0x85cbfe4e, 0x8ae88dd8, 0x7aaaf9b0, 0x4cf9aa7e,
343 0x1948c25c, 0x02fb8a8c, 0x01c36ae4, 0xd6ebe1f9,
344 0x90d4f869, 0xa65cdea0, 0x3f09252d, 0xc208e69f,
345 0xb74e6132, 0xce77e25b, 0x578fdfe3, 0x3ac372e6,
346 };
347
348 /*
349 * Round loop unrolling macros, S is a pointer to a S-Box array
350 * organized in 4 unsigned longs at a row.
351 */
352 #define GET32_3(x) (((x) & 0xff))
353 #define GET32_2(x) (((x) >> (8)) & (0xff))
354 #define GET32_1(x) (((x) >> (16)) & (0xff))
355 #define GET32_0(x) (((x) >> (24)) & (0xff))
356
357 #define bf_F(x) (((S[GET32_0(x)] + S[256 + GET32_1(x)]) ^ \
358 S[512 + GET32_2(x)]) + S[768 + GET32_3(x)])
359
360 #define EROUND(a, b, n) do { b ^= P[n]; a ^= bf_F(b); } while (0)
361 #define DROUND(a, b, n) do { a ^= bf_F(b); b ^= P[n]; } while (0)
362
363
364 /*
365 * encrypt isdn data frame
366 * every block with 9 samples is encrypted
367 */
368 void
dsp_bf_encrypt(struct dsp * dsp,u8 * data,int len)369 dsp_bf_encrypt(struct dsp *dsp, u8 *data, int len)
370 {
371 int i = 0, j = dsp->bf_crypt_pos;
372 u8 *bf_data_in = dsp->bf_data_in;
373 u8 *bf_crypt_out = dsp->bf_crypt_out;
374 u32 *P = dsp->bf_p;
375 u32 *S = dsp->bf_s;
376 u32 yl, yr;
377 u32 cs;
378 u8 nibble;
379
380 while (i < len) {
381 /* collect a block of 9 samples */
382 if (j < 9) {
383 bf_data_in[j] = *data;
384 *data++ = bf_crypt_out[j++];
385 i++;
386 continue;
387 }
388 j = 0;
389 /* transcode 9 samples xlaw to 8 bytes */
390 yl = dsp_audio_law2seven[bf_data_in[0]];
391 yl = (yl << 7) | dsp_audio_law2seven[bf_data_in[1]];
392 yl = (yl << 7) | dsp_audio_law2seven[bf_data_in[2]];
393 yl = (yl << 7) | dsp_audio_law2seven[bf_data_in[3]];
394 nibble = dsp_audio_law2seven[bf_data_in[4]];
395 yr = nibble;
396 yl = (yl << 4) | (nibble >> 3);
397 yr = (yr << 7) | dsp_audio_law2seven[bf_data_in[5]];
398 yr = (yr << 7) | dsp_audio_law2seven[bf_data_in[6]];
399 yr = (yr << 7) | dsp_audio_law2seven[bf_data_in[7]];
400 yr = (yr << 7) | dsp_audio_law2seven[bf_data_in[8]];
401 yr = (yr << 1) | (bf_data_in[0] & 1);
402
403 /* fill unused bit with random noise of audio input */
404 /* encrypt */
405
406 EROUND(yr, yl, 0);
407 EROUND(yl, yr, 1);
408 EROUND(yr, yl, 2);
409 EROUND(yl, yr, 3);
410 EROUND(yr, yl, 4);
411 EROUND(yl, yr, 5);
412 EROUND(yr, yl, 6);
413 EROUND(yl, yr, 7);
414 EROUND(yr, yl, 8);
415 EROUND(yl, yr, 9);
416 EROUND(yr, yl, 10);
417 EROUND(yl, yr, 11);
418 EROUND(yr, yl, 12);
419 EROUND(yl, yr, 13);
420 EROUND(yr, yl, 14);
421 EROUND(yl, yr, 15);
422 yl ^= P[16];
423 yr ^= P[17];
424
425 /* calculate 3-bit checksumme */
426 cs = yl ^ (yl >> 3) ^ (yl >> 6) ^ (yl >> 9) ^ (yl >> 12) ^ (yl >> 15)
427 ^ (yl >> 18) ^ (yl >> 21) ^ (yl >> 24) ^ (yl >> 27) ^ (yl >> 30)
428 ^ (yr << 2) ^ (yr >> 1) ^ (yr >> 4) ^ (yr >> 7) ^ (yr >> 10)
429 ^ (yr >> 13) ^ (yr >> 16) ^ (yr >> 19) ^ (yr >> 22) ^ (yr >> 25)
430 ^ (yr >> 28) ^ (yr >> 31);
431
432 /*
433 * transcode 8 crypted bytes to 9 data bytes with sync
434 * and checksum information
435 */
436 bf_crypt_out[0] = (yl >> 25) | 0x80;
437 bf_crypt_out[1] = (yl >> 18) & 0x7f;
438 bf_crypt_out[2] = (yl >> 11) & 0x7f;
439 bf_crypt_out[3] = (yl >> 4) & 0x7f;
440 bf_crypt_out[4] = ((yl << 3) & 0x78) | ((yr >> 29) & 0x07);
441 bf_crypt_out[5] = ((yr >> 22) & 0x7f) | ((cs << 5) & 0x80);
442 bf_crypt_out[6] = ((yr >> 15) & 0x7f) | ((cs << 6) & 0x80);
443 bf_crypt_out[7] = ((yr >> 8) & 0x7f) | (cs << 7);
444 bf_crypt_out[8] = yr;
445 }
446
447 /* write current count */
448 dsp->bf_crypt_pos = j;
449
450 }
451
452
453 /*
454 * decrypt isdn data frame
455 * every block with 9 bytes is decrypted
456 */
457 void
dsp_bf_decrypt(struct dsp * dsp,u8 * data,int len)458 dsp_bf_decrypt(struct dsp *dsp, u8 *data, int len)
459 {
460 int i = 0;
461 u8 j = dsp->bf_decrypt_in_pos;
462 u8 k = dsp->bf_decrypt_out_pos;
463 u8 *bf_crypt_inring = dsp->bf_crypt_inring;
464 u8 *bf_data_out = dsp->bf_data_out;
465 u16 sync = dsp->bf_sync;
466 u32 *P = dsp->bf_p;
467 u32 *S = dsp->bf_s;
468 u32 yl, yr;
469 u8 nibble;
470 u8 cs, cs0, cs1, cs2;
471
472 while (i < len) {
473 /*
474 * shift upper bit and rotate data to buffer ring
475 * send current decrypted data
476 */
477 sync = (sync << 1) | ((*data) >> 7);
478 bf_crypt_inring[j++ & 15] = *data;
479 *data++ = bf_data_out[k++];
480 i++;
481 if (k == 9)
482 k = 0; /* repeat if no sync has been found */
483 /* check if not in sync */
484 if ((sync & 0x1f0) != 0x100)
485 continue;
486 j -= 9;
487 /* transcode receive data to 64 bit block of encrypted data */
488 yl = bf_crypt_inring[j++ & 15];
489 yl = (yl << 7) | bf_crypt_inring[j++ & 15]; /* bit7 = 0 */
490 yl = (yl << 7) | bf_crypt_inring[j++ & 15]; /* bit7 = 0 */
491 yl = (yl << 7) | bf_crypt_inring[j++ & 15]; /* bit7 = 0 */
492 nibble = bf_crypt_inring[j++ & 15]; /* bit7 = 0 */
493 yr = nibble;
494 yl = (yl << 4) | (nibble >> 3);
495 cs2 = bf_crypt_inring[j++ & 15];
496 yr = (yr << 7) | (cs2 & 0x7f);
497 cs1 = bf_crypt_inring[j++ & 15];
498 yr = (yr << 7) | (cs1 & 0x7f);
499 cs0 = bf_crypt_inring[j++ & 15];
500 yr = (yr << 7) | (cs0 & 0x7f);
501 yr = (yr << 8) | bf_crypt_inring[j++ & 15];
502
503 /* calculate 3-bit checksumme */
504 cs = yl ^ (yl >> 3) ^ (yl >> 6) ^ (yl >> 9) ^ (yl >> 12) ^ (yl >> 15)
505 ^ (yl >> 18) ^ (yl >> 21) ^ (yl >> 24) ^ (yl >> 27) ^ (yl >> 30)
506 ^ (yr << 2) ^ (yr >> 1) ^ (yr >> 4) ^ (yr >> 7) ^ (yr >> 10)
507 ^ (yr >> 13) ^ (yr >> 16) ^ (yr >> 19) ^ (yr >> 22) ^ (yr >> 25)
508 ^ (yr >> 28) ^ (yr >> 31);
509
510 /* check if frame is valid */
511 if ((cs & 0x7) != (((cs2 >> 5) & 4) | ((cs1 >> 6) & 2) | (cs0 >> 7))) {
512 if (dsp_debug & DEBUG_DSP_BLOWFISH)
513 printk(KERN_DEBUG
514 "DSP BLOWFISH: received corrupt frame, "
515 "checksumme is not correct\n");
516 continue;
517 }
518
519 /* decrypt */
520 yr ^= P[17];
521 yl ^= P[16];
522 DROUND(yl, yr, 15);
523 DROUND(yr, yl, 14);
524 DROUND(yl, yr, 13);
525 DROUND(yr, yl, 12);
526 DROUND(yl, yr, 11);
527 DROUND(yr, yl, 10);
528 DROUND(yl, yr, 9);
529 DROUND(yr, yl, 8);
530 DROUND(yl, yr, 7);
531 DROUND(yr, yl, 6);
532 DROUND(yl, yr, 5);
533 DROUND(yr, yl, 4);
534 DROUND(yl, yr, 3);
535 DROUND(yr, yl, 2);
536 DROUND(yl, yr, 1);
537 DROUND(yr, yl, 0);
538
539 /* transcode 8 crypted bytes to 9 sample bytes */
540 bf_data_out[0] = dsp_audio_seven2law[(yl >> 25) & 0x7f];
541 bf_data_out[1] = dsp_audio_seven2law[(yl >> 18) & 0x7f];
542 bf_data_out[2] = dsp_audio_seven2law[(yl >> 11) & 0x7f];
543 bf_data_out[3] = dsp_audio_seven2law[(yl >> 4) & 0x7f];
544 bf_data_out[4] = dsp_audio_seven2law[((yl << 3) & 0x78) |
545 ((yr >> 29) & 0x07)];
546
547 bf_data_out[5] = dsp_audio_seven2law[(yr >> 22) & 0x7f];
548 bf_data_out[6] = dsp_audio_seven2law[(yr >> 15) & 0x7f];
549 bf_data_out[7] = dsp_audio_seven2law[(yr >> 8) & 0x7f];
550 bf_data_out[8] = dsp_audio_seven2law[(yr >> 1) & 0x7f];
551 k = 0; /* start with new decoded frame */
552 }
553
554 /* write current count and sync */
555 dsp->bf_decrypt_in_pos = j;
556 dsp->bf_decrypt_out_pos = k;
557 dsp->bf_sync = sync;
558 }
559
560
561 /* used to encrypt S and P boxes */
562 static inline void
encrypt_block(const u32 * P,const u32 * S,u32 * dst,u32 * src)563 encrypt_block(const u32 *P, const u32 *S, u32 *dst, u32 *src)
564 {
565 u32 yl = src[0];
566 u32 yr = src[1];
567
568 EROUND(yr, yl, 0);
569 EROUND(yl, yr, 1);
570 EROUND(yr, yl, 2);
571 EROUND(yl, yr, 3);
572 EROUND(yr, yl, 4);
573 EROUND(yl, yr, 5);
574 EROUND(yr, yl, 6);
575 EROUND(yl, yr, 7);
576 EROUND(yr, yl, 8);
577 EROUND(yl, yr, 9);
578 EROUND(yr, yl, 10);
579 EROUND(yl, yr, 11);
580 EROUND(yr, yl, 12);
581 EROUND(yl, yr, 13);
582 EROUND(yr, yl, 14);
583 EROUND(yl, yr, 15);
584
585 yl ^= P[16];
586 yr ^= P[17];
587
588 dst[0] = yr;
589 dst[1] = yl;
590 }
591
592 /*
593 * initialize the dsp for encryption and decryption using the same key
594 * Calculates the blowfish S and P boxes for encryption and decryption.
595 * The margin of keylen must be 4-56 bytes.
596 * returns 0 if ok.
597 */
598 int
dsp_bf_init(struct dsp * dsp,const u8 * key,uint keylen)599 dsp_bf_init(struct dsp *dsp, const u8 *key, uint keylen)
600 {
601 short i, j, count;
602 u32 data[2], temp;
603 u32 *P = (u32 *)dsp->bf_p;
604 u32 *S = (u32 *)dsp->bf_s;
605
606 if (keylen < 4 || keylen > 56)
607 return 1;
608
609 /* Set dsp states */
610 i = 0;
611 while (i < 9) {
612 dsp->bf_crypt_out[i] = 0xff;
613 dsp->bf_data_out[i] = dsp_silence;
614 i++;
615 }
616 dsp->bf_crypt_pos = 0;
617 dsp->bf_decrypt_in_pos = 0;
618 dsp->bf_decrypt_out_pos = 0;
619 dsp->bf_sync = 0x1ff;
620 dsp->bf_enable = 1;
621
622 /* Copy the initialization s-boxes */
623 for (i = 0, count = 0; i < 256; i++)
624 for (j = 0; j < 4; j++, count++)
625 S[count] = bf_sbox[count];
626
627 /* Set the p-boxes */
628 for (i = 0; i < 16 + 2; i++)
629 P[i] = bf_pbox[i];
630
631 /* Actual subkey generation */
632 for (j = 0, i = 0; i < 16 + 2; i++) {
633 temp = (((u32)key[j] << 24) |
634 ((u32)key[(j + 1) % keylen] << 16) |
635 ((u32)key[(j + 2) % keylen] << 8) |
636 ((u32)key[(j + 3) % keylen]));
637
638 P[i] = P[i] ^ temp;
639 j = (j + 4) % keylen;
640 }
641
642 data[0] = 0x00000000;
643 data[1] = 0x00000000;
644
645 for (i = 0; i < 16 + 2; i += 2) {
646 encrypt_block(P, S, data, data);
647
648 P[i] = data[0];
649 P[i + 1] = data[1];
650 }
651
652 for (i = 0; i < 4; i++) {
653 for (j = 0, count = i * 256; j < 256; j += 2, count += 2) {
654 encrypt_block(P, S, data, data);
655
656 S[count] = data[0];
657 S[count + 1] = data[1];
658 }
659 }
660
661 return 0;
662 }
663
664
665 /*
666 * turn encryption off
667 */
668 void
dsp_bf_cleanup(struct dsp * dsp)669 dsp_bf_cleanup(struct dsp *dsp)
670 {
671 dsp->bf_enable = 0;
672 }
673