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1 | #include <assert.h> |
2 | #include "ssh.h" |
3 | |
033b4cef |
4 | |
d1e726bc |
5 | /* des.c - implementation of DES |
6 | */ |
7 | |
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8 | /* |
d1e726bc |
9 | * Description of DES |
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10 | * ------------------ |
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11 | * |
12 | * Unlike the description in FIPS 46, I'm going to use _sensible_ indices: |
13 | * bits in an n-bit word are numbered from 0 at the LSB to n-1 at the MSB. |
14 | * And S-boxes are indexed by six consecutive bits, not by the outer two |
15 | * followed by the middle four. |
16 | * |
17 | * The DES encryption routine requires a 64-bit input, and a key schedule K |
18 | * containing 16 48-bit elements. |
19 | * |
20 | * First the input is permuted by the initial permutation IP. |
21 | * Then the input is split into 32-bit words L and R. (L is the MSW.) |
22 | * Next, 16 rounds. In each round: |
23 | * (L, R) <- (R, L xor f(R, K[i])) |
24 | * Then the pre-output words L and R are swapped. |
25 | * Then L and R are glued back together into a 64-bit word. (L is the MSW, |
26 | * again, but since we just swapped them, the MSW is the R that came out |
27 | * of the last round.) |
28 | * The 64-bit output block is permuted by the inverse of IP and returned. |
29 | * |
30 | * Decryption is identical except that the elements of K are used in the |
31 | * opposite order. (This wouldn't work if that word swap didn't happen.) |
32 | * |
33 | * The function f, used in each round, accepts a 32-bit word R and a |
34 | * 48-bit key block K. It produces a 32-bit output. |
35 | * |
36 | * First R is expanded to 48 bits using the bit-selection function E. |
37 | * The resulting 48-bit block is XORed with the key block K to produce |
38 | * a 48-bit block X. |
39 | * This block X is split into eight groups of 6 bits. Each group of 6 |
40 | * bits is then looked up in one of the eight S-boxes to convert |
41 | * it to 4 bits. These eight groups of 4 bits are glued back |
42 | * together to produce a 32-bit preoutput block. |
43 | * The preoutput block is permuted using the permutation P and returned. |
44 | * |
45 | * Key setup maps a 64-bit key word into a 16x48-bit key schedule. Although |
46 | * the approved input format for the key is a 64-bit word, eight of the |
47 | * bits are discarded, so the actual quantity of key used is 56 bits. |
48 | * |
49 | * First the input key is converted to two 28-bit words C and D using |
50 | * the bit-selection function PC1. |
51 | * Then 16 rounds of key setup occur. In each round, C and D are each |
52 | * rotated left by either 1 or 2 bits (depending on which round), and |
53 | * then converted into a key schedule element using the bit-selection |
54 | * function PC2. |
55 | * |
56 | * That's the actual algorithm. Now for the tedious details: all those |
57 | * painful permutations and lookup tables. |
58 | * |
59 | * IP is a 64-to-64 bit permutation. Its output contains the following |
60 | * bits of its input (listed in order MSB to LSB of output). |
61 | * |
62 | * 6 14 22 30 38 46 54 62 4 12 20 28 36 44 52 60 |
63 | * 2 10 18 26 34 42 50 58 0 8 16 24 32 40 48 56 |
64 | * 7 15 23 31 39 47 55 63 5 13 21 29 37 45 53 61 |
65 | * 3 11 19 27 35 43 51 59 1 9 17 25 33 41 49 57 |
66 | * |
67 | * E is a 32-to-48 bit selection function. Its output contains the following |
68 | * bits of its input (listed in order MSB to LSB of output). |
69 | * |
70 | * 0 31 30 29 28 27 28 27 26 25 24 23 24 23 22 21 20 19 20 19 18 17 16 15 |
71 | * 16 15 14 13 12 11 12 11 10 9 8 7 8 7 6 5 4 3 4 3 2 1 0 31 |
72 | * |
73 | * The S-boxes are arbitrary table-lookups each mapping a 6-bit input to a |
74 | * 4-bit output. In other words, each S-box is an array[64] of 4-bit numbers. |
75 | * The S-boxes are listed below. The first S-box listed is applied to the |
76 | * most significant six bits of the block X; the last one is applied to the |
77 | * least significant. |
78 | * |
79 | * 14 0 4 15 13 7 1 4 2 14 15 2 11 13 8 1 |
80 | * 3 10 10 6 6 12 12 11 5 9 9 5 0 3 7 8 |
81 | * 4 15 1 12 14 8 8 2 13 4 6 9 2 1 11 7 |
82 | * 15 5 12 11 9 3 7 14 3 10 10 0 5 6 0 13 |
83 | * |
84 | * 15 3 1 13 8 4 14 7 6 15 11 2 3 8 4 14 |
85 | * 9 12 7 0 2 1 13 10 12 6 0 9 5 11 10 5 |
86 | * 0 13 14 8 7 10 11 1 10 3 4 15 13 4 1 2 |
87 | * 5 11 8 6 12 7 6 12 9 0 3 5 2 14 15 9 |
88 | * |
89 | * 10 13 0 7 9 0 14 9 6 3 3 4 15 6 5 10 |
90 | * 1 2 13 8 12 5 7 14 11 12 4 11 2 15 8 1 |
91 | * 13 1 6 10 4 13 9 0 8 6 15 9 3 8 0 7 |
92 | * 11 4 1 15 2 14 12 3 5 11 10 5 14 2 7 12 |
93 | * |
94 | * 7 13 13 8 14 11 3 5 0 6 6 15 9 0 10 3 |
95 | * 1 4 2 7 8 2 5 12 11 1 12 10 4 14 15 9 |
96 | * 10 3 6 15 9 0 0 6 12 10 11 1 7 13 13 8 |
97 | * 15 9 1 4 3 5 14 11 5 12 2 7 8 2 4 14 |
98 | * |
99 | * 2 14 12 11 4 2 1 12 7 4 10 7 11 13 6 1 |
100 | * 8 5 5 0 3 15 15 10 13 3 0 9 14 8 9 6 |
101 | * 4 11 2 8 1 12 11 7 10 1 13 14 7 2 8 13 |
102 | * 15 6 9 15 12 0 5 9 6 10 3 4 0 5 14 3 |
103 | * |
104 | * 12 10 1 15 10 4 15 2 9 7 2 12 6 9 8 5 |
105 | * 0 6 13 1 3 13 4 14 14 0 7 11 5 3 11 8 |
106 | * 9 4 14 3 15 2 5 12 2 9 8 5 12 15 3 10 |
107 | * 7 11 0 14 4 1 10 7 1 6 13 0 11 8 6 13 |
108 | * |
109 | * 4 13 11 0 2 11 14 7 15 4 0 9 8 1 13 10 |
110 | * 3 14 12 3 9 5 7 12 5 2 10 15 6 8 1 6 |
111 | * 1 6 4 11 11 13 13 8 12 1 3 4 7 10 14 7 |
112 | * 10 9 15 5 6 0 8 15 0 14 5 2 9 3 2 12 |
113 | * |
114 | * 13 1 2 15 8 13 4 8 6 10 15 3 11 7 1 4 |
115 | * 10 12 9 5 3 6 14 11 5 0 0 14 12 9 7 2 |
116 | * 7 2 11 1 4 14 1 7 9 4 12 10 14 8 2 13 |
117 | * 0 15 6 12 10 9 13 0 15 3 3 5 5 6 8 11 |
118 | * |
119 | * P is a 32-to-32 bit permutation. Its output contains the following |
120 | * bits of its input (listed in order MSB to LSB of output). |
121 | * |
122 | * 16 25 12 11 3 20 4 15 31 17 9 6 27 14 1 22 |
123 | * 30 24 8 18 0 5 29 23 13 19 2 26 10 21 28 7 |
124 | * |
125 | * PC1 is a 64-to-56 bit selection function. Its output is in two words, |
126 | * C and D. The word C contains the following bits of its input (listed |
127 | * in order MSB to LSB of output). |
128 | * |
129 | * 7 15 23 31 39 47 55 63 6 14 22 30 38 46 |
130 | * 54 62 5 13 21 29 37 45 53 61 4 12 20 28 |
131 | * |
132 | * And the word D contains these bits. |
133 | * |
134 | * 1 9 17 25 33 41 49 57 2 10 18 26 34 42 |
135 | * 50 58 3 11 19 27 35 43 51 59 36 44 52 60 |
136 | * |
137 | * PC2 is a 56-to-48 bit selection function. Its input is in two words, |
138 | * C and D. These are treated as one 56-bit word (with C more significant, |
139 | * so that bits 55 to 28 of the word are bits 27 to 0 of C, and bits 27 to |
140 | * 0 of the word are bits 27 to 0 of D). The output contains the following |
141 | * bits of this 56-bit input word (listed in order MSB to LSB of output). |
142 | * |
143 | * 42 39 45 32 55 51 53 28 41 50 35 46 33 37 44 52 30 48 40 49 29 36 43 54 |
144 | * 15 4 25 19 9 1 26 16 5 11 23 8 12 7 17 0 22 3 10 14 6 20 27 24 |
145 | */ |
146 | |
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147 | /* |
148 | * Implementation details |
149 | * ---------------------- |
150 | * |
151 | * If you look at the code in this module, you'll find it looks |
152 | * nothing _like_ the above algorithm. Here I explain the |
153 | * differences... |
154 | * |
155 | * Key setup has not been heavily optimised here. We are not |
156 | * concerned with key agility: we aren't codebreakers. We don't |
157 | * mind a little delay (and it really is a little one; it may be a |
158 | * factor of five or so slower than it could be but it's still not |
159 | * an appreciable length of time) while setting up. The only tweaks |
160 | * in the key setup are ones which change the format of the key |
161 | * schedule to speed up the actual encryption. I'll describe those |
162 | * below. |
163 | * |
164 | * The first and most obvious optimisation is the S-boxes. Since |
165 | * each S-box always targets the same four bits in the final 32-bit |
166 | * word, so the output from (for example) S-box 0 must always be |
167 | * shifted left 28 bits, we can store the already-shifted outputs |
168 | * in the lookup tables. This reduces lookup-and-shift to lookup, |
169 | * so the S-box step is now just a question of ORing together eight |
170 | * table lookups. |
171 | * |
172 | * The permutation P is just a bit order change; it's invariant |
173 | * with respect to OR, in that P(x)|P(y) = P(x|y). Therefore, we |
174 | * can apply P to every entry of the S-box tables and then we don't |
175 | * have to do it in the code of f(). This yields a set of tables |
176 | * which might be called SP-boxes. |
177 | * |
178 | * The bit-selection function E is our next target. Note that E is |
179 | * immediately followed by the operation of splitting into 6-bit |
180 | * chunks. Examining the 6-bit chunks coming out of E we notice |
181 | * they're all contiguous within the word (speaking cyclically - |
182 | * the end two wrap round); so we can extract those bit strings |
183 | * individually rather than explicitly running E. This would yield |
184 | * code such as |
185 | * |
186 | * y |= SPboxes[0][ (rotl(R, 5) ^ top6bitsofK) & 0x3F ]; |
187 | * t |= SPboxes[1][ (rotl(R,11) ^ next6bitsofK) & 0x3F ]; |
188 | * |
189 | * and so on; and the key schedule preparation would have to |
190 | * provide each 6-bit chunk separately. |
191 | * |
192 | * Really we'd like to XOR in the key schedule element before |
193 | * looking up bit strings in R. This we can't do, naively, because |
194 | * the 6-bit strings we want overlap. But look at the strings: |
195 | * |
196 | * 3322222222221111111111 |
197 | * bit 10987654321098765432109876543210 |
198 | * |
199 | * box0 XXXXX X |
200 | * box1 XXXXXX |
201 | * box2 XXXXXX |
202 | * box3 XXXXXX |
203 | * box4 XXXXXX |
204 | * box5 XXXXXX |
205 | * box6 XXXXXX |
206 | * box7 X XXXXX |
207 | * |
208 | * The bit strings we need to XOR in for boxes 0, 2, 4 and 6 don't |
209 | * overlap with each other. Neither do the ones for boxes 1, 3, 5 |
210 | * and 7. So we could provide the key schedule in the form of two |
211 | * words that we can separately XOR into R, and then every S-box |
212 | * index is available as a (cyclically) contiguous 6-bit substring |
213 | * of one or the other of the results. |
214 | * |
215 | * The comments in Eric Young's libdes implementation point out |
216 | * that two of these bit strings require a rotation (rather than a |
217 | * simple shift) to extract. It's unavoidable that at least _one_ |
218 | * must do; but we can actually run the whole inner algorithm (all |
219 | * 16 rounds) rotated one bit to the left, so that what the `real' |
220 | * DES description sees as L=0x80000001 we see as L=0x00000003. |
221 | * This requires rotating all our SP-box entries one bit to the |
222 | * left, and rotating each word of the key schedule elements one to |
223 | * the left, and rotating L and R one bit left just after IP and |
224 | * one bit right again just before FP. And in each round we convert |
225 | * a rotate into a shift, so we've saved a few per cent. |
226 | * |
227 | * That's about it for the inner loop; the SP-box tables as listed |
228 | * below are what I've described here (the original S value, |
229 | * shifted to its final place in the input to P, run through P, and |
230 | * then rotated one bit left). All that remains is to optimise the |
231 | * initial permutation IP. |
232 | * |
233 | * IP is not an arbitrary permutation. It has the nice property |
234 | * that if you take any bit number, write it in binary (6 bits), |
235 | * permute those 6 bits and invert some of them, you get the final |
236 | * position of that bit. Specifically, the bit whose initial |
237 | * position is given (in binary) as fedcba ends up in position |
238 | * AcbFED (where a capital letter denotes the inverse of a bit). |
239 | * |
240 | * We have the 64-bit data in two 32-bit words L and R, where bits |
241 | * in L are those with f=1 and bits in R are those with f=0. We |
242 | * note that we can do a simple transformation: suppose we exchange |
243 | * the bits with f=1,c=0 and the bits with f=0,c=1. This will cause |
244 | * the bit fedcba to be in position cedfba - we've `swapped' bits c |
245 | * and f in the position of each bit! |
246 | * |
247 | * Better still, this transformation is easy. In the example above, |
248 | * bits in L with c=0 are bits 0x0F0F0F0F, and those in R with c=1 |
249 | * are 0xF0F0F0F0. So we can do |
250 | * |
251 | * difference = ((R >> 4) ^ L) & 0x0F0F0F0F |
252 | * R ^= (difference << 4) |
253 | * L ^= difference |
254 | * |
255 | * to perform the swap. Let's denote this by bitswap(4,0x0F0F0F0F). |
256 | * Also, we can invert the bit at the top just by exchanging L and |
257 | * R. So in a few swaps and a few of these bit operations we can |
258 | * do: |
259 | * |
260 | * Initially the position of bit fedcba is fedcba |
261 | * Swap L with R to make it Fedcba |
262 | * Perform bitswap( 4,0x0F0F0F0F) to make it cedFba |
263 | * Perform bitswap(16,0x0000FFFF) to make it ecdFba |
264 | * Swap L with R to make it EcdFba |
265 | * Perform bitswap( 2,0x33333333) to make it bcdFEa |
266 | * Perform bitswap( 8,0x00FF00FF) to make it dcbFEa |
267 | * Swap L with R to make it DcbFEa |
268 | * Perform bitswap( 1,0x55555555) to make it acbFED |
269 | * Swap L with R to make it AcbFED |
270 | * |
271 | * (In the actual code the four swaps are implicit: R and L are |
272 | * simply used the other way round in the first, second and last |
273 | * bitswap operations.) |
274 | * |
275 | * The final permutation is just the inverse of IP, so it can be |
276 | * performed by a similar set of operations. |
277 | */ |
278 | |
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279 | typedef struct { |
280 | word32 k0246[16], k1357[16]; |
281 | word32 eiv0, eiv1; |
282 | word32 div0, div1; |
283 | } DESContext; |
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284 | |
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285 | #define rotl(x, c) ( (x << c) | (x >> (32-c)) ) |
286 | #define rotl28(x, c) ( ( (x << c) | (x >> (28-c)) ) & 0x0FFFFFFF) |
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287 | |
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288 | static word32 bitsel(word32 * input, const int *bitnums, int size) |
289 | { |
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290 | word32 ret = 0; |
291 | while (size--) { |
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292 | int bitpos = *bitnums++; |
293 | ret <<= 1; |
294 | if (bitpos >= 0) |
295 | ret |= 1 & (input[bitpos / 32] >> (bitpos % 32)); |
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296 | } |
297 | return ret; |
298 | } |
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299 | |
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300 | void des_key_setup(word32 key_msw, word32 key_lsw, DESContext * sched) |
301 | { |
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302 | |
303 | static const int PC1_Cbits[] = { |
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304 | 7, 15, 23, 31, 39, 47, 55, 63, 6, 14, 22, 30, 38, 46, |
305 | 54, 62, 5, 13, 21, 29, 37, 45, 53, 61, 4, 12, 20, 28 |
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306 | }; |
307 | static const int PC1_Dbits[] = { |
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308 | 1, 9, 17, 25, 33, 41, 49, 57, 2, 10, 18, 26, 34, 42, |
309 | 50, 58, 3, 11, 19, 27, 35, 43, 51, 59, 36, 44, 52, 60 |
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310 | }; |
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311 | /* |
312 | * The bit numbers in the two lists below don't correspond to |
313 | * the ones in the above description of PC2, because in the |
314 | * above description C and D are concatenated so `bit 28' means |
315 | * bit 0 of C. In this implementation we're using the standard |
316 | * `bitsel' function above and C is in the second word, so bit |
317 | * 0 of C is addressed by writing `32' here. |
318 | */ |
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319 | static const int PC2_0246[] = { |
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320 | 49, 36, 59, 55, -1, -1, 37, 41, 48, 56, 34, 52, -1, -1, 15, 4, |
321 | 25, 19, 9, 1, -1, -1, 12, 7, 17, 0, 22, 3, -1, -1, 46, 43 |
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322 | }; |
323 | static const int PC2_1357[] = { |
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324 | -1, -1, 57, 32, 45, 54, 39, 50, -1, -1, 44, 53, 33, 40, 47, 58, |
325 | -1, -1, 26, 16, 5, 11, 23, 8, -1, -1, 10, 14, 6, 20, 27, 24 |
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326 | }; |
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327 | static const int leftshifts[] = |
328 | { 1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1 }; |
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329 | |
330 | word32 C, D; |
331 | word32 buf[2]; |
332 | int i; |
333 | |
334 | buf[0] = key_lsw; |
335 | buf[1] = key_msw; |
336 | |
337 | C = bitsel(buf, PC1_Cbits, 28); |
338 | D = bitsel(buf, PC1_Dbits, 28); |
339 | |
340 | for (i = 0; i < 16; i++) { |
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341 | C = rotl28(C, leftshifts[i]); |
342 | D = rotl28(D, leftshifts[i]); |
343 | buf[0] = D; |
344 | buf[1] = C; |
345 | sched->k0246[i] = bitsel(buf, PC2_0246, 32); |
346 | sched->k1357[i] = bitsel(buf, PC2_1357, 32); |
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347 | } |
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348 | |
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349 | sched->eiv0 = sched->eiv1 = 0; |
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350 | sched->div0 = sched->div1 = 0; /* for good measure */ |
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351 | } |
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352 | |
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353 | static const word32 SPboxes[8][64] = { |
354 | {0x01010400, 0x00000000, 0x00010000, 0x01010404, |
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355 | 0x01010004, 0x00010404, 0x00000004, 0x00010000, |
356 | 0x00000400, 0x01010400, 0x01010404, 0x00000400, |
357 | 0x01000404, 0x01010004, 0x01000000, 0x00000004, |
358 | 0x00000404, 0x01000400, 0x01000400, 0x00010400, |
359 | 0x00010400, 0x01010000, 0x01010000, 0x01000404, |
360 | 0x00010004, 0x01000004, 0x01000004, 0x00010004, |
361 | 0x00000000, 0x00000404, 0x00010404, 0x01000000, |
362 | 0x00010000, 0x01010404, 0x00000004, 0x01010000, |
363 | 0x01010400, 0x01000000, 0x01000000, 0x00000400, |
364 | 0x01010004, 0x00010000, 0x00010400, 0x01000004, |
365 | 0x00000400, 0x00000004, 0x01000404, 0x00010404, |
366 | 0x01010404, 0x00010004, 0x01010000, 0x01000404, |
367 | 0x01000004, 0x00000404, 0x00010404, 0x01010400, |
368 | 0x00000404, 0x01000400, 0x01000400, 0x00000000, |
369 | 0x00010004, 0x00010400, 0x00000000, 0x01010004L}, |
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370 | |
371 | {0x80108020, 0x80008000, 0x00008000, 0x00108020, |
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372 | 0x00100000, 0x00000020, 0x80100020, 0x80008020, |
373 | 0x80000020, 0x80108020, 0x80108000, 0x80000000, |
374 | 0x80008000, 0x00100000, 0x00000020, 0x80100020, |
375 | 0x00108000, 0x00100020, 0x80008020, 0x00000000, |
376 | 0x80000000, 0x00008000, 0x00108020, 0x80100000, |
377 | 0x00100020, 0x80000020, 0x00000000, 0x00108000, |
378 | 0x00008020, 0x80108000, 0x80100000, 0x00008020, |
379 | 0x00000000, 0x00108020, 0x80100020, 0x00100000, |
380 | 0x80008020, 0x80100000, 0x80108000, 0x00008000, |
381 | 0x80100000, 0x80008000, 0x00000020, 0x80108020, |
382 | 0x00108020, 0x00000020, 0x00008000, 0x80000000, |
383 | 0x00008020, 0x80108000, 0x00100000, 0x80000020, |
384 | 0x00100020, 0x80008020, 0x80000020, 0x00100020, |
385 | 0x00108000, 0x00000000, 0x80008000, 0x00008020, |
386 | 0x80000000, 0x80100020, 0x80108020, 0x00108000L}, |
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387 | |
388 | {0x00000208, 0x08020200, 0x00000000, 0x08020008, |
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389 | 0x08000200, 0x00000000, 0x00020208, 0x08000200, |
390 | 0x00020008, 0x08000008, 0x08000008, 0x00020000, |
391 | 0x08020208, 0x00020008, 0x08020000, 0x00000208, |
392 | 0x08000000, 0x00000008, 0x08020200, 0x00000200, |
393 | 0x00020200, 0x08020000, 0x08020008, 0x00020208, |
394 | 0x08000208, 0x00020200, 0x00020000, 0x08000208, |
395 | 0x00000008, 0x08020208, 0x00000200, 0x08000000, |
396 | 0x08020200, 0x08000000, 0x00020008, 0x00000208, |
397 | 0x00020000, 0x08020200, 0x08000200, 0x00000000, |
398 | 0x00000200, 0x00020008, 0x08020208, 0x08000200, |
399 | 0x08000008, 0x00000200, 0x00000000, 0x08020008, |
400 | 0x08000208, 0x00020000, 0x08000000, 0x08020208, |
401 | 0x00000008, 0x00020208, 0x00020200, 0x08000008, |
402 | 0x08020000, 0x08000208, 0x00000208, 0x08020000, |
403 | 0x00020208, 0x00000008, 0x08020008, 0x00020200L}, |
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404 | |
405 | {0x00802001, 0x00002081, 0x00002081, 0x00000080, |
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406 | 0x00802080, 0x00800081, 0x00800001, 0x00002001, |
407 | 0x00000000, 0x00802000, 0x00802000, 0x00802081, |
408 | 0x00000081, 0x00000000, 0x00800080, 0x00800001, |
409 | 0x00000001, 0x00002000, 0x00800000, 0x00802001, |
410 | 0x00000080, 0x00800000, 0x00002001, 0x00002080, |
411 | 0x00800081, 0x00000001, 0x00002080, 0x00800080, |
412 | 0x00002000, 0x00802080, 0x00802081, 0x00000081, |
413 | 0x00800080, 0x00800001, 0x00802000, 0x00802081, |
414 | 0x00000081, 0x00000000, 0x00000000, 0x00802000, |
415 | 0x00002080, 0x00800080, 0x00800081, 0x00000001, |
416 | 0x00802001, 0x00002081, 0x00002081, 0x00000080, |
417 | 0x00802081, 0x00000081, 0x00000001, 0x00002000, |
418 | 0x00800001, 0x00002001, 0x00802080, 0x00800081, |
419 | 0x00002001, 0x00002080, 0x00800000, 0x00802001, |
420 | 0x00000080, 0x00800000, 0x00002000, 0x00802080L}, |
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421 | |
422 | {0x00000100, 0x02080100, 0x02080000, 0x42000100, |
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423 | 0x00080000, 0x00000100, 0x40000000, 0x02080000, |
424 | 0x40080100, 0x00080000, 0x02000100, 0x40080100, |
425 | 0x42000100, 0x42080000, 0x00080100, 0x40000000, |
426 | 0x02000000, 0x40080000, 0x40080000, 0x00000000, |
427 | 0x40000100, 0x42080100, 0x42080100, 0x02000100, |
428 | 0x42080000, 0x40000100, 0x00000000, 0x42000000, |
429 | 0x02080100, 0x02000000, 0x42000000, 0x00080100, |
430 | 0x00080000, 0x42000100, 0x00000100, 0x02000000, |
431 | 0x40000000, 0x02080000, 0x42000100, 0x40080100, |
432 | 0x02000100, 0x40000000, 0x42080000, 0x02080100, |
433 | 0x40080100, 0x00000100, 0x02000000, 0x42080000, |
434 | 0x42080100, 0x00080100, 0x42000000, 0x42080100, |
435 | 0x02080000, 0x00000000, 0x40080000, 0x42000000, |
436 | 0x00080100, 0x02000100, 0x40000100, 0x00080000, |
437 | 0x00000000, 0x40080000, 0x02080100, 0x40000100L}, |
d1e726bc |
438 | |
439 | {0x20000010, 0x20400000, 0x00004000, 0x20404010, |
32874aea |
440 | 0x20400000, 0x00000010, 0x20404010, 0x00400000, |
441 | 0x20004000, 0x00404010, 0x00400000, 0x20000010, |
442 | 0x00400010, 0x20004000, 0x20000000, 0x00004010, |
443 | 0x00000000, 0x00400010, 0x20004010, 0x00004000, |
444 | 0x00404000, 0x20004010, 0x00000010, 0x20400010, |
445 | 0x20400010, 0x00000000, 0x00404010, 0x20404000, |
446 | 0x00004010, 0x00404000, 0x20404000, 0x20000000, |
447 | 0x20004000, 0x00000010, 0x20400010, 0x00404000, |
448 | 0x20404010, 0x00400000, 0x00004010, 0x20000010, |
449 | 0x00400000, 0x20004000, 0x20000000, 0x00004010, |
450 | 0x20000010, 0x20404010, 0x00404000, 0x20400000, |
451 | 0x00404010, 0x20404000, 0x00000000, 0x20400010, |
452 | 0x00000010, 0x00004000, 0x20400000, 0x00404010, |
453 | 0x00004000, 0x00400010, 0x20004010, 0x00000000, |
454 | 0x20404000, 0x20000000, 0x00400010, 0x20004010L}, |
d1e726bc |
455 | |
456 | {0x00200000, 0x04200002, 0x04000802, 0x00000000, |
32874aea |
457 | 0x00000800, 0x04000802, 0x00200802, 0x04200800, |
458 | 0x04200802, 0x00200000, 0x00000000, 0x04000002, |
459 | 0x00000002, 0x04000000, 0x04200002, 0x00000802, |
460 | 0x04000800, 0x00200802, 0x00200002, 0x04000800, |
461 | 0x04000002, 0x04200000, 0x04200800, 0x00200002, |
462 | 0x04200000, 0x00000800, 0x00000802, 0x04200802, |
463 | 0x00200800, 0x00000002, 0x04000000, 0x00200800, |
464 | 0x04000000, 0x00200800, 0x00200000, 0x04000802, |
465 | 0x04000802, 0x04200002, 0x04200002, 0x00000002, |
466 | 0x00200002, 0x04000000, 0x04000800, 0x00200000, |
467 | 0x04200800, 0x00000802, 0x00200802, 0x04200800, |
468 | 0x00000802, 0x04000002, 0x04200802, 0x04200000, |
469 | 0x00200800, 0x00000000, 0x00000002, 0x04200802, |
470 | 0x00000000, 0x00200802, 0x04200000, 0x00000800, |
471 | 0x04000002, 0x04000800, 0x00000800, 0x00200002L}, |
d1e726bc |
472 | |
473 | {0x10001040, 0x00001000, 0x00040000, 0x10041040, |
32874aea |
474 | 0x10000000, 0x10001040, 0x00000040, 0x10000000, |
475 | 0x00040040, 0x10040000, 0x10041040, 0x00041000, |
476 | 0x10041000, 0x00041040, 0x00001000, 0x00000040, |
477 | 0x10040000, 0x10000040, 0x10001000, 0x00001040, |
478 | 0x00041000, 0x00040040, 0x10040040, 0x10041000, |
479 | 0x00001040, 0x00000000, 0x00000000, 0x10040040, |
480 | 0x10000040, 0x10001000, 0x00041040, 0x00040000, |
481 | 0x00041040, 0x00040000, 0x10041000, 0x00001000, |
482 | 0x00000040, 0x10040040, 0x00001000, 0x00041040, |
483 | 0x10001000, 0x00000040, 0x10000040, 0x10040000, |
484 | 0x10040040, 0x10000000, 0x00040000, 0x10001040, |
485 | 0x00000000, 0x10041040, 0x00040040, 0x10000040, |
486 | 0x10040000, 0x10001000, 0x10001040, 0x00000000, |
487 | 0x10041040, 0x00041000, 0x00041000, 0x00001040, |
488 | 0x00001040, 0x00040040, 0x10000000, 0x10041000L} |
d1e726bc |
489 | }; |
374330e2 |
490 | |
d1e726bc |
491 | #define f(R, K0246, K1357) (\ |
492 | s0246 = R ^ K0246, \ |
493 | s1357 = R ^ K1357, \ |
494 | s0246 = rotl(s0246, 28), \ |
495 | SPboxes[0] [(s0246 >> 24) & 0x3F] | \ |
496 | SPboxes[1] [(s1357 >> 24) & 0x3F] | \ |
497 | SPboxes[2] [(s0246 >> 16) & 0x3F] | \ |
498 | SPboxes[3] [(s1357 >> 16) & 0x3F] | \ |
499 | SPboxes[4] [(s0246 >> 8) & 0x3F] | \ |
500 | SPboxes[5] [(s1357 >> 8) & 0x3F] | \ |
501 | SPboxes[6] [(s0246 ) & 0x3F] | \ |
502 | SPboxes[7] [(s1357 ) & 0x3F]) |
503 | |
504 | #define bitswap(L, R, n, mask) (\ |
505 | swap = mask & ( (R >> n) ^ L ), \ |
506 | R ^= swap << n, \ |
507 | L ^= swap) |
508 | |
509 | /* Initial permutation */ |
510 | #define IP(L, R) (\ |
511 | bitswap(R, L, 4, 0x0F0F0F0F), \ |
512 | bitswap(R, L, 16, 0x0000FFFF), \ |
513 | bitswap(L, R, 2, 0x33333333), \ |
514 | bitswap(L, R, 8, 0x00FF00FF), \ |
515 | bitswap(R, L, 1, 0x55555555)) |
516 | |
517 | /* Final permutation */ |
518 | #define FP(L, R) (\ |
519 | bitswap(R, L, 1, 0x55555555), \ |
520 | bitswap(L, R, 8, 0x00FF00FF), \ |
521 | bitswap(L, R, 2, 0x33333333), \ |
522 | bitswap(R, L, 16, 0x0000FFFF), \ |
523 | bitswap(R, L, 4, 0x0F0F0F0F)) |
524 | |
32874aea |
525 | void des_encipher(word32 * output, word32 L, word32 R, DESContext * sched) |
526 | { |
d1e726bc |
527 | word32 swap, s0246, s1357; |
528 | |
529 | IP(L, R); |
530 | |
531 | L = rotl(L, 1); |
532 | R = rotl(R, 1); |
533 | |
32874aea |
534 | L ^= f(R, sched->k0246[0], sched->k1357[0]); |
535 | R ^= f(L, sched->k0246[1], sched->k1357[1]); |
536 | L ^= f(R, sched->k0246[2], sched->k1357[2]); |
537 | R ^= f(L, sched->k0246[3], sched->k1357[3]); |
538 | L ^= f(R, sched->k0246[4], sched->k1357[4]); |
539 | R ^= f(L, sched->k0246[5], sched->k1357[5]); |
540 | L ^= f(R, sched->k0246[6], sched->k1357[6]); |
541 | R ^= f(L, sched->k0246[7], sched->k1357[7]); |
542 | L ^= f(R, sched->k0246[8], sched->k1357[8]); |
543 | R ^= f(L, sched->k0246[9], sched->k1357[9]); |
d1e726bc |
544 | L ^= f(R, sched->k0246[10], sched->k1357[10]); |
545 | R ^= f(L, sched->k0246[11], sched->k1357[11]); |
546 | L ^= f(R, sched->k0246[12], sched->k1357[12]); |
547 | R ^= f(L, sched->k0246[13], sched->k1357[13]); |
548 | L ^= f(R, sched->k0246[14], sched->k1357[14]); |
549 | R ^= f(L, sched->k0246[15], sched->k1357[15]); |
550 | |
551 | L = rotl(L, 31); |
552 | R = rotl(R, 31); |
553 | |
32874aea |
554 | swap = L; |
555 | L = R; |
556 | R = swap; |
d1e726bc |
557 | |
558 | FP(L, R); |
559 | |
560 | output[0] = L; |
561 | output[1] = R; |
562 | } |
374330e2 |
563 | |
32874aea |
564 | void des_decipher(word32 * output, word32 L, word32 R, DESContext * sched) |
565 | { |
d1e726bc |
566 | word32 swap, s0246, s1357; |
374330e2 |
567 | |
d1e726bc |
568 | IP(L, R); |
374330e2 |
569 | |
d1e726bc |
570 | L = rotl(L, 1); |
571 | R = rotl(R, 1); |
374330e2 |
572 | |
d1e726bc |
573 | L ^= f(R, sched->k0246[15], sched->k1357[15]); |
574 | R ^= f(L, sched->k0246[14], sched->k1357[14]); |
575 | L ^= f(R, sched->k0246[13], sched->k1357[13]); |
576 | R ^= f(L, sched->k0246[12], sched->k1357[12]); |
577 | L ^= f(R, sched->k0246[11], sched->k1357[11]); |
578 | R ^= f(L, sched->k0246[10], sched->k1357[10]); |
32874aea |
579 | L ^= f(R, sched->k0246[9], sched->k1357[9]); |
580 | R ^= f(L, sched->k0246[8], sched->k1357[8]); |
581 | L ^= f(R, sched->k0246[7], sched->k1357[7]); |
582 | R ^= f(L, sched->k0246[6], sched->k1357[6]); |
583 | L ^= f(R, sched->k0246[5], sched->k1357[5]); |
584 | R ^= f(L, sched->k0246[4], sched->k1357[4]); |
585 | L ^= f(R, sched->k0246[3], sched->k1357[3]); |
586 | R ^= f(L, sched->k0246[2], sched->k1357[2]); |
587 | L ^= f(R, sched->k0246[1], sched->k1357[1]); |
588 | R ^= f(L, sched->k0246[0], sched->k1357[0]); |
d1e726bc |
589 | |
590 | L = rotl(L, 31); |
591 | R = rotl(R, 31); |
592 | |
32874aea |
593 | swap = L; |
594 | L = R; |
595 | R = swap; |
d1e726bc |
596 | |
597 | FP(L, R); |
598 | |
599 | output[0] = L; |
600 | output[1] = R; |
374330e2 |
601 | } |
602 | |
d1e726bc |
603 | #define GET_32BIT_MSB_FIRST(cp) \ |
604 | (((unsigned long)(unsigned char)(cp)[3]) | \ |
605 | ((unsigned long)(unsigned char)(cp)[2] << 8) | \ |
606 | ((unsigned long)(unsigned char)(cp)[1] << 16) | \ |
607 | ((unsigned long)(unsigned char)(cp)[0] << 24)) |
608 | |
609 | #define PUT_32BIT_MSB_FIRST(cp, value) do { \ |
610 | (cp)[3] = (value); \ |
611 | (cp)[2] = (value) >> 8; \ |
612 | (cp)[1] = (value) >> 16; \ |
613 | (cp)[0] = (value) >> 24; } while (0) |
614 | |
615 | static void des_cbc_encrypt(unsigned char *dest, const unsigned char *src, |
32874aea |
616 | unsigned int len, DESContext * sched) |
617 | { |
d1e726bc |
618 | word32 out[2], iv0, iv1; |
619 | unsigned int i; |
620 | |
621 | assert((len & 7) == 0); |
622 | |
623 | iv0 = sched->eiv0; |
624 | iv1 = sched->eiv1; |
625 | for (i = 0; i < len; i += 8) { |
32874aea |
626 | iv0 ^= GET_32BIT_MSB_FIRST(src); |
627 | src += 4; |
628 | iv1 ^= GET_32BIT_MSB_FIRST(src); |
629 | src += 4; |
630 | des_encipher(out, iv0, iv1, sched); |
631 | iv0 = out[0]; |
632 | iv1 = out[1]; |
633 | PUT_32BIT_MSB_FIRST(dest, iv0); |
634 | dest += 4; |
635 | PUT_32BIT_MSB_FIRST(dest, iv1); |
636 | dest += 4; |
374330e2 |
637 | } |
d1e726bc |
638 | sched->eiv0 = iv0; |
639 | sched->eiv1 = iv1; |
374330e2 |
640 | } |
641 | |
d1e726bc |
642 | static void des_cbc_decrypt(unsigned char *dest, const unsigned char *src, |
32874aea |
643 | unsigned int len, DESContext * sched) |
644 | { |
d1e726bc |
645 | word32 out[2], iv0, iv1, xL, xR; |
646 | unsigned int i; |
647 | |
648 | assert((len & 7) == 0); |
649 | |
650 | iv0 = sched->div0; |
651 | iv1 = sched->div1; |
652 | for (i = 0; i < len; i += 8) { |
32874aea |
653 | xL = GET_32BIT_MSB_FIRST(src); |
654 | src += 4; |
655 | xR = GET_32BIT_MSB_FIRST(src); |
656 | src += 4; |
657 | des_decipher(out, xL, xR, sched); |
658 | iv0 ^= out[0]; |
659 | iv1 ^= out[1]; |
660 | PUT_32BIT_MSB_FIRST(dest, iv0); |
661 | dest += 4; |
662 | PUT_32BIT_MSB_FIRST(dest, iv1); |
663 | dest += 4; |
664 | iv0 = xL; |
665 | iv1 = xR; |
374330e2 |
666 | } |
d1e726bc |
667 | sched->div0 = iv0; |
668 | sched->div1 = iv1; |
374330e2 |
669 | } |
670 | |
d1e726bc |
671 | static void des_3cbc_encrypt(unsigned char *dest, const unsigned char *src, |
32874aea |
672 | unsigned int len, DESContext * scheds) |
673 | { |
d1e726bc |
674 | des_cbc_encrypt(dest, src, len, &scheds[0]); |
675 | des_cbc_decrypt(dest, src, len, &scheds[1]); |
676 | des_cbc_encrypt(dest, src, len, &scheds[2]); |
374330e2 |
677 | } |
678 | |
033b4cef |
679 | static void des_cbc3_encrypt(unsigned char *dest, const unsigned char *src, |
32874aea |
680 | unsigned int len, DESContext * scheds) |
681 | { |
033b4cef |
682 | word32 out[2], iv0, iv1; |
683 | unsigned int i; |
684 | |
685 | assert((len & 7) == 0); |
686 | |
687 | iv0 = scheds->eiv0; |
688 | iv1 = scheds->eiv1; |
689 | for (i = 0; i < len; i += 8) { |
32874aea |
690 | iv0 ^= GET_32BIT_MSB_FIRST(src); |
691 | src += 4; |
692 | iv1 ^= GET_32BIT_MSB_FIRST(src); |
693 | src += 4; |
694 | des_encipher(out, iv0, iv1, &scheds[0]); |
695 | des_decipher(out, out[0], out[1], &scheds[1]); |
696 | des_encipher(out, out[0], out[1], &scheds[2]); |
697 | iv0 = out[0]; |
698 | iv1 = out[1]; |
699 | PUT_32BIT_MSB_FIRST(dest, iv0); |
700 | dest += 4; |
701 | PUT_32BIT_MSB_FIRST(dest, iv1); |
702 | dest += 4; |
033b4cef |
703 | } |
704 | scheds->eiv0 = iv0; |
705 | scheds->eiv1 = iv1; |
706 | } |
707 | |
d1e726bc |
708 | static void des_3cbc_decrypt(unsigned char *dest, const unsigned char *src, |
32874aea |
709 | unsigned int len, DESContext * scheds) |
710 | { |
d1e726bc |
711 | des_cbc_decrypt(dest, src, len, &scheds[2]); |
712 | des_cbc_encrypt(dest, src, len, &scheds[1]); |
713 | des_cbc_decrypt(dest, src, len, &scheds[0]); |
374330e2 |
714 | } |
715 | |
033b4cef |
716 | static void des_cbc3_decrypt(unsigned char *dest, const unsigned char *src, |
32874aea |
717 | unsigned int len, DESContext * scheds) |
718 | { |
033b4cef |
719 | word32 out[2], iv0, iv1, xL, xR; |
720 | unsigned int i; |
721 | |
722 | assert((len & 7) == 0); |
723 | |
724 | iv0 = scheds->div0; |
725 | iv1 = scheds->div1; |
726 | for (i = 0; i < len; i += 8) { |
32874aea |
727 | xL = GET_32BIT_MSB_FIRST(src); |
728 | src += 4; |
729 | xR = GET_32BIT_MSB_FIRST(src); |
730 | src += 4; |
731 | des_decipher(out, xL, xR, &scheds[2]); |
732 | des_encipher(out, out[0], out[1], &scheds[1]); |
733 | des_decipher(out, out[0], out[1], &scheds[0]); |
734 | iv0 ^= out[0]; |
735 | iv1 ^= out[1]; |
736 | PUT_32BIT_MSB_FIRST(dest, iv0); |
737 | dest += 4; |
738 | PUT_32BIT_MSB_FIRST(dest, iv1); |
739 | dest += 4; |
740 | iv0 = xL; |
741 | iv1 = xR; |
033b4cef |
742 | } |
743 | scheds->div0 = iv0; |
744 | scheds->div1 = iv1; |
745 | } |
746 | |
d39f364a |
747 | static DESContext cskeys[3], sckeys[3]; |
374330e2 |
748 | |
32874aea |
749 | static void des3_cskey(unsigned char *key) |
750 | { |
d1e726bc |
751 | des_key_setup(GET_32BIT_MSB_FIRST(key), |
32874aea |
752 | GET_32BIT_MSB_FIRST(key + 4), &cskeys[0]); |
753 | des_key_setup(GET_32BIT_MSB_FIRST(key + 8), |
754 | GET_32BIT_MSB_FIRST(key + 12), &cskeys[1]); |
755 | des_key_setup(GET_32BIT_MSB_FIRST(key + 16), |
756 | GET_32BIT_MSB_FIRST(key + 20), &cskeys[2]); |
d39f364a |
757 | logevent("Initialised triple-DES client->server encryption"); |
758 | } |
759 | |
0d7c43a6 |
760 | static void des_cskey(unsigned char *key) |
761 | { |
762 | des_key_setup(GET_32BIT_MSB_FIRST(key), |
763 | GET_32BIT_MSB_FIRST(key + 4), &cskeys[0]); |
764 | logevent("Initialised single-DES client->server encryption"); |
765 | } |
766 | |
32874aea |
767 | static void des3_csiv(unsigned char *key) |
768 | { |
d39f364a |
769 | cskeys[0].eiv0 = GET_32BIT_MSB_FIRST(key); |
32874aea |
770 | cskeys[0].eiv1 = GET_32BIT_MSB_FIRST(key + 4); |
d39f364a |
771 | } |
772 | |
32874aea |
773 | static void des3_sciv(unsigned char *key) |
774 | { |
d39f364a |
775 | sckeys[0].div0 = GET_32BIT_MSB_FIRST(key); |
32874aea |
776 | sckeys[0].div1 = GET_32BIT_MSB_FIRST(key + 4); |
d39f364a |
777 | } |
778 | |
32874aea |
779 | static void des3_sckey(unsigned char *key) |
780 | { |
d39f364a |
781 | des_key_setup(GET_32BIT_MSB_FIRST(key), |
32874aea |
782 | GET_32BIT_MSB_FIRST(key + 4), &sckeys[0]); |
783 | des_key_setup(GET_32BIT_MSB_FIRST(key + 8), |
784 | GET_32BIT_MSB_FIRST(key + 12), &sckeys[1]); |
785 | des_key_setup(GET_32BIT_MSB_FIRST(key + 16), |
786 | GET_32BIT_MSB_FIRST(key + 20), &sckeys[2]); |
d39f364a |
787 | logevent("Initialised triple-DES server->client encryption"); |
788 | } |
789 | |
0d7c43a6 |
790 | static void des_sckey(unsigned char *key) |
791 | { |
792 | des_key_setup(GET_32BIT_MSB_FIRST(key), |
793 | GET_32BIT_MSB_FIRST(key + 4), &sckeys[0]); |
794 | logevent("Initialised single-DES server->client encryption"); |
795 | } |
796 | |
32874aea |
797 | static void des3_sesskey(unsigned char *key) |
798 | { |
d39f364a |
799 | des3_cskey(key); |
800 | des3_sckey(key); |
374330e2 |
801 | } |
802 | |
32874aea |
803 | static void des3_encrypt_blk(unsigned char *blk, int len) |
804 | { |
d39f364a |
805 | des_3cbc_encrypt(blk, blk, len, cskeys); |
374330e2 |
806 | } |
807 | |
32874aea |
808 | static void des3_decrypt_blk(unsigned char *blk, int len) |
809 | { |
d39f364a |
810 | des_3cbc_decrypt(blk, blk, len, sckeys); |
374330e2 |
811 | } |
812 | |
32874aea |
813 | static void des3_ssh2_encrypt_blk(unsigned char *blk, int len) |
814 | { |
033b4cef |
815 | des_cbc3_encrypt(blk, blk, len, cskeys); |
816 | } |
817 | |
32874aea |
818 | static void des3_ssh2_decrypt_blk(unsigned char *blk, int len) |
819 | { |
033b4cef |
820 | des_cbc3_decrypt(blk, blk, len, sckeys); |
821 | } |
822 | |
0d7c43a6 |
823 | static void des_ssh2_encrypt_blk(unsigned char *blk, int len) |
824 | { |
825 | des_cbc_encrypt(blk, blk, len, cskeys); |
826 | } |
827 | |
828 | static void des_ssh2_decrypt_blk(unsigned char *blk, int len) |
829 | { |
830 | des_cbc_decrypt(blk, blk, len, sckeys); |
831 | } |
832 | |
32874aea |
833 | void des3_decrypt_pubkey(unsigned char *key, unsigned char *blk, int len) |
834 | { |
7cca0d81 |
835 | DESContext ourkeys[3]; |
836 | des_key_setup(GET_32BIT_MSB_FIRST(key), |
32874aea |
837 | GET_32BIT_MSB_FIRST(key + 4), &ourkeys[0]); |
838 | des_key_setup(GET_32BIT_MSB_FIRST(key + 8), |
839 | GET_32BIT_MSB_FIRST(key + 12), &ourkeys[1]); |
7cca0d81 |
840 | des_key_setup(GET_32BIT_MSB_FIRST(key), |
32874aea |
841 | GET_32BIT_MSB_FIRST(key + 4), &ourkeys[2]); |
7cca0d81 |
842 | des_3cbc_decrypt(blk, blk, len, ourkeys); |
ee5c1422 |
843 | memset(ourkeys, 0, sizeof(ourkeys)); |
7cca0d81 |
844 | } |
845 | |
32874aea |
846 | void des3_encrypt_pubkey(unsigned char *key, unsigned char *blk, int len) |
847 | { |
6e522441 |
848 | DESContext ourkeys[3]; |
849 | des_key_setup(GET_32BIT_MSB_FIRST(key), |
32874aea |
850 | GET_32BIT_MSB_FIRST(key + 4), &ourkeys[0]); |
851 | des_key_setup(GET_32BIT_MSB_FIRST(key + 8), |
852 | GET_32BIT_MSB_FIRST(key + 12), &ourkeys[1]); |
6e522441 |
853 | des_key_setup(GET_32BIT_MSB_FIRST(key), |
32874aea |
854 | GET_32BIT_MSB_FIRST(key + 4), &ourkeys[2]); |
6e522441 |
855 | des_3cbc_encrypt(blk, blk, len, ourkeys); |
ee5c1422 |
856 | memset(ourkeys, 0, sizeof(ourkeys)); |
6e522441 |
857 | } |
858 | |
9dda6459 |
859 | void des3_decrypt_pubkey_ossh(unsigned char *key, unsigned char *iv, |
860 | unsigned char *blk, int len) |
861 | { |
862 | DESContext ourkeys[3]; |
863 | des_key_setup(GET_32BIT_MSB_FIRST(key), |
864 | GET_32BIT_MSB_FIRST(key + 4), &ourkeys[0]); |
865 | des_key_setup(GET_32BIT_MSB_FIRST(key + 8), |
866 | GET_32BIT_MSB_FIRST(key + 12), &ourkeys[1]); |
867 | des_key_setup(GET_32BIT_MSB_FIRST(key + 16), |
868 | GET_32BIT_MSB_FIRST(key + 20), &ourkeys[2]); |
869 | ourkeys[0].div0 = GET_32BIT_MSB_FIRST(iv); |
870 | ourkeys[0].div1 = GET_32BIT_MSB_FIRST(iv+4); |
871 | des_cbc3_decrypt(blk, blk, len, ourkeys); |
ee5c1422 |
872 | memset(ourkeys, 0, sizeof(ourkeys)); |
9dda6459 |
873 | } |
874 | |
875 | void des3_encrypt_pubkey_ossh(unsigned char *key, unsigned char *iv, |
876 | unsigned char *blk, int len) |
877 | { |
878 | DESContext ourkeys[3]; |
879 | des_key_setup(GET_32BIT_MSB_FIRST(key), |
880 | GET_32BIT_MSB_FIRST(key + 4), &ourkeys[0]); |
881 | des_key_setup(GET_32BIT_MSB_FIRST(key + 8), |
882 | GET_32BIT_MSB_FIRST(key + 12), &ourkeys[1]); |
883 | des_key_setup(GET_32BIT_MSB_FIRST(key + 16), |
884 | GET_32BIT_MSB_FIRST(key + 20), &ourkeys[2]); |
885 | ourkeys[0].eiv0 = GET_32BIT_MSB_FIRST(iv); |
886 | ourkeys[0].eiv1 = GET_32BIT_MSB_FIRST(iv+4); |
887 | des_cbc3_encrypt(blk, blk, len, ourkeys); |
ee5c1422 |
888 | memset(ourkeys, 0, sizeof(ourkeys)); |
9dda6459 |
889 | } |
890 | |
65a22376 |
891 | static const struct ssh2_cipher ssh_3des_ssh2 = { |
d39f364a |
892 | des3_csiv, des3_cskey, |
893 | des3_sciv, des3_sckey, |
033b4cef |
894 | des3_ssh2_encrypt_blk, |
895 | des3_ssh2_decrypt_blk, |
896 | "3des-cbc", |
d2a0e0be |
897 | 8, 168 |
033b4cef |
898 | }; |
899 | |
0d7c43a6 |
900 | /* |
901 | * Single DES in ssh2. It isn't clear that "des-cbc" is an official |
902 | * cipher name, but ssh.com support it and apparently aren't the |
903 | * only people to do so, so we sigh and implement it anyway. |
904 | */ |
905 | static const struct ssh2_cipher ssh_des_ssh2 = { |
906 | des3_csiv, des_cskey, /* iv functions shared with 3des */ |
907 | des3_sciv, des_sckey, |
908 | des_ssh2_encrypt_blk, |
909 | des_ssh2_decrypt_blk, |
910 | "des-cbc", |
911 | 8, 56 |
912 | }; |
913 | |
65a22376 |
914 | static const struct ssh2_cipher *const des3_list[] = { |
0a3f1d48 |
915 | &ssh_3des_ssh2 |
916 | }; |
917 | |
65a22376 |
918 | const struct ssh2_ciphers ssh2_3des = { |
0a3f1d48 |
919 | sizeof(des3_list) / sizeof(*des3_list), |
920 | des3_list |
921 | }; |
922 | |
0d7c43a6 |
923 | static const struct ssh2_cipher *const des_list[] = { |
924 | &ssh_des_ssh2 |
925 | }; |
926 | |
927 | const struct ssh2_ciphers ssh2_des = { |
928 | sizeof(des3_list) / sizeof(*des_list), |
929 | des_list |
930 | }; |
931 | |
65a22376 |
932 | const struct ssh_cipher ssh_3des = { |
033b4cef |
933 | des3_sesskey, |
374330e2 |
934 | des3_encrypt_blk, |
e5574168 |
935 | des3_decrypt_blk, |
0a3f1d48 |
936 | 8 |
374330e2 |
937 | }; |
938 | |
32874aea |
939 | static void des_sesskey(unsigned char *key) |
940 | { |
0d7c43a6 |
941 | des_cskey(key); |
942 | des_sckey(key); |
9697bfd2 |
943 | } |
944 | |
32874aea |
945 | static void des_encrypt_blk(unsigned char *blk, int len) |
946 | { |
d39f364a |
947 | des_cbc_encrypt(blk, blk, len, cskeys); |
9697bfd2 |
948 | } |
949 | |
32874aea |
950 | static void des_decrypt_blk(unsigned char *blk, int len) |
951 | { |
d39f364a |
952 | des_cbc_decrypt(blk, blk, len, cskeys); |
9697bfd2 |
953 | } |
954 | |
65a22376 |
955 | const struct ssh_cipher ssh_des = { |
9697bfd2 |
956 | des_sesskey, |
957 | des_encrypt_blk, |
e5574168 |
958 | des_decrypt_blk, |
0a3f1d48 |
959 | 8 |
9697bfd2 |
960 | }; |