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comparison rvinterf/etmsync/cl_des.c @ 14:3d148edb87c2

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eliminated the dependency on OpenSSL for Pirelli IMEI DES decryption
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 03 Oct 2016 07:00:55 +0000
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13:46ad66a231af 14:3d148edb87c2
1 /*
2 * This DES implementation is used for the purpose of decrypting
3 * Pirelli's factory IMEI record; it has been lifted out of TI's
4 * reference GSM firmware source.
5 */
6
7 #include "cl_des.h"
8
9 typedef unsigned char UBYTE;
10
11 /* 64+64+17*56+16*48+64+17*32+17*32 = 3000 bytes */
12 static UBYTE binmsg[64] , binkey[64], cd[17][56] , deskey[16][48] , ip[64];
13 static UBYTE l[17][32] , r[17][32];
14 /* 64+64+32+32+64+64+17*3+2 = 373 bytes */
15 static UBYTE rnew[64] , xorres[64] , scale[32] , perm[32] , rl[64] , encpt[64];
16
17 /* 64+16+48+64+48+32+64+8*66 = 864 bytes */
18 static
19 const UBYTE shtamt[16] = {1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1};
20 static
21 const UBYTE iporder[64] = {58,50,42,34,26,18,10,2,60,52,44,36,28,20,12,4,62,54,
22 46,38,30,22,14,6,64,56,48,40,32,24,16,8,57,49,41,33,
23 25,17,9,1,59,51,43,35,27,19,11,3,61,53,45,37,29,21,
24 13,5,63,55,47,39,31,23,15,7};
25 static
26 const UBYTE pc1[64] = {57,49,41,33,25,17,9,1,58,50,42,34,26,18,10,2,59,51,43,
27 35,27,19,11,3,60,52,44,36,63,55,47,39,31,23,15,7,62,54,
28 46,38,30,22,14,6,61,53,45,37,29,21,13,5,28,20,12,4};
29 static
30 const UBYTE pc2[48] = {14,17,11,24,1,5,3,28,15,6,21,10,23,19,12,4,26,8,
31 16,7,27,20,13,2,41,52,31,37,47,55,30,40,51,45,33,
32 48,44,49,39,56,34,53,46,42,50,36,29,32};
33 static
34 const UBYTE e[48] = {32,1,2,3,4,5,4,5,6,7,8,9,8,9,10,11,12,13,12,13,14,15,
35 16,17,16,17,18,19,20,21,20,21,22,23,24,25,24,25,26,27,
36 28,29,28, 29,30,31,32,1};
37 static
38 const UBYTE sp[32] = {16,7,20,21,29,12,28,17,1,15,23,26,5,18,31,10,
39 2,8,24,14,32,27,3,9,19,13,30,6,22,11,4,25};
40 static
41 const UBYTE ipinv[64] = {40,8,48,16,56,24,64,32,39,7,47,15,55,23,63,31,38,6,46,
42 14,54,22,62,30,37,5,45,13,53,21,61,29,36,4,44,12,52,
43 20,60,28,35,3,43,11,51,19,59,27,34,2,42,10,50,18,58,
44 26,33,1,41,9,49,17,57,25};
45 static
46 const UBYTE s[8][66] = {{14,4,13,1,2,15,11,8,3,10,6,12,5,9,0,7,0,15,7,4,14,2,13,
47 1,10,6,12,11,9,5,3,8,4,1,14,8,13,6,2,11,15,12,9,7,3,10,
48 5,0,15,12,8,2,4,9,1,7,5,11,3,14,10,0,6,13},
49 {15,1,8,14,6,11,3,4,9,7,2,13,12,0,5,10,3,13,4,7,15,2,8,
50 14,12,0,1,10,6,9,11,5,0,14,7,11,10,4,13,1,5,8,12,6,9,3,
51 2,15,13,8,10,1,3,15,4,2,11,6,7,12,0,5,14,9},
52 {10,0,9,14,6,3,15,5,1,13,12,7,11,4,2,8,13,7,0,9,3,4,6,
53 10,2,8,5,14,12,11,15,1,13,6,4,9,8,15,3,0,11,1,2,12,5,
54 10,14,7,1,10,13,0,6,9,8,7,4,15,14,3,11,5,2,12 },
55 {7,13,14,3,0,6,9,10,1,2,8,5,11,12,4,15,13,8,11,5,6,15,
56 0,3,4,7,2,12,1,10,14,9,10,6,9,0,12,11,7,13,15,1,3,14,
57 5,2,8,4,3,15,0,6,10,1,13,8,9,4,5,11,12,7,2,14 },
58 {2,12,4,1,7,10,11,6,8,5,3,15,13,0,14,9,14,11,2,12,4,7,
59 13,1,5,0,15,10,3,9,8,6,4,2,1,11,10,13,7,8,15,9,12,5,6,
60 3,0,14,11,8,12,7,1,14,2,13,6,15,0,9,10,4,5,3 },
61 {12,1,10,15,9,2,6,8,0,13,3,4,14,7,5,11,10,15,4,2,7,12,
62 9,5,6,1,13,14,0,11,3,8,9,14,15,5,2,8,12,3,7,0,4,10,1,
63 13,11,6,4,3,2,12,9,5,15,10,11,14,1,7,6,0,8,13 },
64 {4,11,2,14,15,0,8,13,3,12,9,7,5,10,6,1,13,0,11,7,4,9,1,
65 10,14,3,5,12,2,15,8,6,1,4,11,13,12,3,7,14,10,15,6,8,0,
66 5,9,2,6,11,13,8,1,4,10,7,9,5,0,15,14,2,3,12 },
67 {13,2,8,4,6,15,11,1,10,9,3,14,5,0,12,7,1,15,13,8,10,3,7,
68 4,12,5,6,11,0,14,9,2,7,11,4,1,9,12,14,2,0,6,10,13,15,3,
69 5,8,2,1,14,7,4,10,8,13,15,12,9,0,3,5,6,11 }};
70
71
72 /*==== FUNCTIONS ==================================================*/
73
74 #define LOCAL static
75
76 /*
77 +------------------------------------------------------------------------------
78 | Function : des_hex2bin4
79 +------------------------------------------------------------------------------
80 | Description : The function converts a 4 bit hex value to 4 binary values
81 |
82 | Parameters : hex : value in hex
83 | m : pointer to buffer of 4 elements to store binary values
84 +------------------------------------------------------------------------------
85 */
86 LOCAL void des_hex2bin4(UBYTE hex, UBYTE *m)
87 {
88 m[0] = (hex & 0x08) >> 3;
89 m[1] = (hex & 0x04) >> 2;
90 m[2] = (hex & 0x02) >> 1;
91 m[3] = hex & 0x01;
92 }
93
94 /*
95 +------------------------------------------------------------------------------
96 | Function : des_hex2bin8
97 +------------------------------------------------------------------------------
98 | Description : The function converts a 8 bit hex value to 8 binary values
99 |
100 | Parameters : hex : value in hex
101 | m : pointer to buffer of 8 elements to store binary values
102 +------------------------------------------------------------------------------
103 */
104 LOCAL void des_hex2bin8(UBYTE hex, UBYTE *m)
105 {
106 m[0] = (hex & 0x80) >> 7;
107 m[1] = (hex & 0x40) >> 6;
108 m[2] = (hex & 0x20) >> 5;
109 m[3] = (hex & 0x10) >> 4;
110 m[4] = (hex & 0x08) >> 3;
111 m[5] = (hex & 0x04) >> 2;
112 m[6] = (hex & 0x02) >> 1;
113 m[7] = hex & 0x01;
114 }
115
116 /*
117 +------------------------------------------------------------------------------
118 | Function : des_bin2hex
119 +------------------------------------------------------------------------------
120 | Description : The function converts 8 bin values to an 8 bit hex value
121 |
122 | Parameters : m[8] : input bin values
123 | Return : converted hex value
124 +------------------------------------------------------------------------------
125 */
126
127 LOCAL UBYTE des_bin2hex(UBYTE *m)
128 {
129 UBYTE hex;
130 return hex = (m[0]<<7) | (m[1]<<6) | (m[2]<<5) | (m[3]<<4) |
131 (m[4]<<3) | (m[5]<<2) | (m[6]<<1) | m[7];
132 }
133
134
135
136 /*
137 +------------------------------------------------------------------------------
138 | Function : des_shift
139 +------------------------------------------------------------------------------
140 | Description : The function performs shifting
141 |
142 | Parameters : dst : pointer to destination buffer
143 | src : pointer to source buffer
144 | sht : shift value
145 +------------------------------------------------------------------------------
146 */
147
148 LOCAL void des_shift(UBYTE *dst, UBYTE *src, UBYTE sht)
149 {
150 UBYTE c1 , c2 , d1 , d2;
151 int i;
152
153 c1 = src[0];
154 c2 = src[1];
155 d1 = src[28];
156 d2 = src[29];
157
158 for ( i = 0 ; i < 28 - sht ; i++) {
159 dst[i] = src[i + sht]; /* copying c[i] */
160 dst[28 + i] = src[28 + i + sht]; /* copying d[i] */
161 }
162
163 if (sht == 1){
164 dst[27] = c1;
165 dst[55] = d1;
166 } else {
167 dst[26] = c1;
168 dst[27] = c2;
169 dst[54] = d1;
170 dst[55] = d2;
171 }
172 }
173
174 /*
175 +------------------------------------------------------------------------------
176 | Function : des_indx
177 +------------------------------------------------------------------------------
178 | Description : The function generates index for S table
179 |
180 | Parameters : m[6] :
181 | Return : index value
182 +------------------------------------------------------------------------------
183 */
184 LOCAL UBYTE des_indx(UBYTE *m)
185 {
186 return( (((m[0]<<1) + m[5])<<4) + ((m[1]<<3) + (m[2]<<2) + (m[3]<<1) + m[4]));
187 }
188
189 /*
190 +------------------------------------------------------------------------------
191 | Function : cl_des
192 +------------------------------------------------------------------------------
193 | Description : The function performs DES encrypting or decrypting
194 |
195 | Parameters : inMsgPtr : pointer to input message M. The length of message
196 | has to be min. 8 bytes e.g. M = 0123456789abcdef
197 | desKeyPtr : pointer to DES key. Length has to be 8 bytes
198 | outMsgPtr : output encrypted/decrypted message. The length is 8 b.
199 | code : CL_DES_ENCRYPTION, CL_DES_DECRYPTION
200 +------------------------------------------------------------------------------
201 */
202 void cl_des(UBYTE *inMsgPtr, UBYTE *desKeyPtr, UBYTE *outMsgPtr, UBYTE code)
203 {
204
205 int y , z , g;
206 UBYTE temp, more;
207
208 /*
209 * convert message from hex to bin format
210 */
211 for(y = 0; y < 8; y++){
212 des_hex2bin8(inMsgPtr[y], &binmsg[8 * y]);
213 }
214
215 /*
216 * Convert DES key value from hex to bin format
217 */
218 for( y = 0; y < 8; y++){
219 des_hex2bin8(desKeyPtr[y], &binkey[8 * y]);
220 }
221
222 /*
223 * Step 1: Create 16 subkeys, each of which is 48-bits long.
224 *
225 * The 64-bit key is permuted according to the table pc1,
226 * to get the 56 bit subkey K+. The subkey K+ consists of left
227 * and right halves C0 and D0, where each half has 28 bits.
228 */
229 for(y = 0 ; y < 56 ; y++)
230 cd[0][y] = binkey[pc1[y] - 1];
231 /*
232 * Create futher 15 subkeys C1-C16 and D1-D16 by left shifts of
233 * each previous key, i.e. C2 and D2 are obtained from C1 and D1 and so on.
234 */
235 for(y = 0 ; y < 16 ; y++)
236 des_shift(cd[y + 1] , cd[y] , shtamt[y]);
237
238 /*
239 * Form the keys K1-K16 by applying the pc2 permutation
240 * table to each of the concatenated pairs CnDn.
241 */
242 for(y = 0; y < 16; y++){
243 for(z = 0 ; z < 48 ; z++){
244 deskey[y][z] = cd[y + 1][pc2[z] - 1];
245 }
246 }
247
248 /*
249 * Step 2: Encode each 64-bit block of data
250 *
251 * Perform initial permutation IP of th e64 bits the message data M.
252 * This rearranges the bits according to the iporder table.
253 */
254 for(y = 0; y < 64; y++)
255 ip[y] = binmsg[iporder[y] - 1];
256
257 /*
258 * Divide the permuted block IP into left half L0
259 * and a right half R0 each of 32 bits.
260 */
261 for(y = 0; y < 32; y++){
262 l[0][y] = ip[y];
263 r[0][y] = ip[y + 32];
264 }
265
266 /*
267 * Proceed through 16 iterations, operation on two blocks:
268 * a data block of 32 bits and a key Kn of 48 bits to produce a block of 32
269 * bits. This results in a final block L16R16. In each iteration, we take
270 * the right 32 bits of the previous result and make them the left 32 bits
271 * of the current step. For the right 32 bits in the current step, we XOR
272 * the left 32 bits of the previous step.
273 */
274 for (y = 0; y < 16; y++){
275 if (code == CL_DES_ENCRYPTION)/* encryption */
276 g = y;
277 else /* decryption */
278 g = 15 - y;
279
280 /*
281 * Copie the right bits Rn of the current step
282 * to the left bits Ln+1 of the next step
283 */
284 for(z = 0; z < 32; z++)
285 l[y + 1][z] = r[y][z];
286
287 /*
288 * Expand the block Rn from 32 to 48 bits by using the selection table E.
289 * Then XOR the result with the key Kn+1.
290 */
291 for(z = 0; z < 48; z++){
292 rnew[z] = r[y][e[z] - 1];
293 xorres[z] = (rnew[z] ^ deskey[g][z]);
294 }
295
296 /*
297 * We now have 48 bits, or eight groups of six bits. We use them as
298 * addresses in tables calle "S boxes". Each group of six bits will
299 * give us an address in a different S box.
300 */
301 for(z = 0; z < 8; z++){
302 temp = s[z][des_indx(&xorres[z * 6])];
303 des_hex2bin4(temp, &scale[z * 4]);
304 }
305
306 /*
307 * Perform a permutation P of the S box output.
308 */
309 for(z = 0; z < 32; z++)
310 perm[z] = scale[sp[z] - 1];
311
312 /*
313 * XOR the result with the left half of current step
314 * and copie it to the right half of the next step
315 */
316 for(z = 0; z < 32; z++)
317 r[y+1][z] = (l[y][z] ^ perm[z]);
318 }
319
320 /*
321 * Reserve the order of the final block L16R16 to R16L16
322 */
323 for( z = 0; z < 32; z++){
324 rl[z] = r[16][z];
325 rl[z + 32] = l[16][z];
326 }
327
328 /*
329 * Apply the final inverse permutation IP
330 */
331 for( z = 0; z < 64; z++){
332 encpt[z] = rl[ipinv[z] - 1];
333 }
334
335 /*
336 * Convert from bin to hex format
337 */
338 for(z = 0; z < 8; z++){
339 outMsgPtr[z] = des_bin2hex(&encpt[8 * z]);
340 }
341 }