3 * Copyright (C) 1998 Ross Anderson, Eli Biham, Lars Knudsen
5 * For more information see http://www.cl.cam.ac.uk/users/rja14/serpent.html
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2, or (at your option)
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software Foundation,
19 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
26 #include "serpentsboxes.h"
28 void serpent_makekey(struct keyInstance
*key
, int keyLen
,
32 uint32_t w
[132],k
[132];
34 for(i
=0; i
<keyLen
/32; i
++)
35 w
[i
]=GET_32BIT_MSB_FIRST(keyMaterial
+ (keyLen
/8 - i
*4) - 4);
37 w
[i
]=(GET_32BIT_MSB_FIRST(keyMaterial
+ (keyLen
/8 - i
*4) - 4)
38 & ((1L<<((keyLen
&31)))-1)) | (1L<<((keyLen
&31)));
42 w
[i
]=ROL(w
[i
-8]^w
[i
-5]^w
[i
-3]^w
[i
-1]^PHI
^(i
-8),11);
46 w
[i
]=ROL(w
[i
-8]^w
[i
-5]^w
[i
-3]^w
[i
-1]^PHI
^i
,11);
48 RND03(w
[ 0], w
[ 1], w
[ 2], w
[ 3], k
[ 0], k
[ 1], k
[ 2], k
[ 3]);
49 RND02(w
[ 4], w
[ 5], w
[ 6], w
[ 7], k
[ 4], k
[ 5], k
[ 6], k
[ 7]);
50 RND01(w
[ 8], w
[ 9], w
[ 10], w
[ 11], k
[ 8], k
[ 9], k
[ 10], k
[ 11]);
51 RND00(w
[ 12], w
[ 13], w
[ 14], w
[ 15], k
[ 12], k
[ 13], k
[ 14], k
[ 15]);
52 RND31(w
[ 16], w
[ 17], w
[ 18], w
[ 19], k
[ 16], k
[ 17], k
[ 18], k
[ 19]);
53 RND30(w
[ 20], w
[ 21], w
[ 22], w
[ 23], k
[ 20], k
[ 21], k
[ 22], k
[ 23]);
54 RND29(w
[ 24], w
[ 25], w
[ 26], w
[ 27], k
[ 24], k
[ 25], k
[ 26], k
[ 27]);
55 RND28(w
[ 28], w
[ 29], w
[ 30], w
[ 31], k
[ 28], k
[ 29], k
[ 30], k
[ 31]);
56 RND27(w
[ 32], w
[ 33], w
[ 34], w
[ 35], k
[ 32], k
[ 33], k
[ 34], k
[ 35]);
57 RND26(w
[ 36], w
[ 37], w
[ 38], w
[ 39], k
[ 36], k
[ 37], k
[ 38], k
[ 39]);
58 RND25(w
[ 40], w
[ 41], w
[ 42], w
[ 43], k
[ 40], k
[ 41], k
[ 42], k
[ 43]);
59 RND24(w
[ 44], w
[ 45], w
[ 46], w
[ 47], k
[ 44], k
[ 45], k
[ 46], k
[ 47]);
60 RND23(w
[ 48], w
[ 49], w
[ 50], w
[ 51], k
[ 48], k
[ 49], k
[ 50], k
[ 51]);
61 RND22(w
[ 52], w
[ 53], w
[ 54], w
[ 55], k
[ 52], k
[ 53], k
[ 54], k
[ 55]);
62 RND21(w
[ 56], w
[ 57], w
[ 58], w
[ 59], k
[ 56], k
[ 57], k
[ 58], k
[ 59]);
63 RND20(w
[ 60], w
[ 61], w
[ 62], w
[ 63], k
[ 60], k
[ 61], k
[ 62], k
[ 63]);
64 RND19(w
[ 64], w
[ 65], w
[ 66], w
[ 67], k
[ 64], k
[ 65], k
[ 66], k
[ 67]);
65 RND18(w
[ 68], w
[ 69], w
[ 70], w
[ 71], k
[ 68], k
[ 69], k
[ 70], k
[ 71]);
66 RND17(w
[ 72], w
[ 73], w
[ 74], w
[ 75], k
[ 72], k
[ 73], k
[ 74], k
[ 75]);
67 RND16(w
[ 76], w
[ 77], w
[ 78], w
[ 79], k
[ 76], k
[ 77], k
[ 78], k
[ 79]);
68 RND15(w
[ 80], w
[ 81], w
[ 82], w
[ 83], k
[ 80], k
[ 81], k
[ 82], k
[ 83]);
69 RND14(w
[ 84], w
[ 85], w
[ 86], w
[ 87], k
[ 84], k
[ 85], k
[ 86], k
[ 87]);
70 RND13(w
[ 88], w
[ 89], w
[ 90], w
[ 91], k
[ 88], k
[ 89], k
[ 90], k
[ 91]);
71 RND12(w
[ 92], w
[ 93], w
[ 94], w
[ 95], k
[ 92], k
[ 93], k
[ 94], k
[ 95]);
72 RND11(w
[ 96], w
[ 97], w
[ 98], w
[ 99], k
[ 96], k
[ 97], k
[ 98], k
[ 99]);
73 RND10(w
[100], w
[101], w
[102], w
[103], k
[100], k
[101], k
[102], k
[103]);
74 RND09(w
[104], w
[105], w
[106], w
[107], k
[104], k
[105], k
[106], k
[107]);
75 RND08(w
[108], w
[109], w
[110], w
[111], k
[108], k
[109], k
[110], k
[111]);
76 RND07(w
[112], w
[113], w
[114], w
[115], k
[112], k
[113], k
[114], k
[115]);
77 RND06(w
[116], w
[117], w
[118], w
[119], k
[116], k
[117], k
[118], k
[119]);
78 RND05(w
[120], w
[121], w
[122], w
[123], k
[120], k
[121], k
[122], k
[123]);
79 RND04(w
[124], w
[125], w
[126], w
[127], k
[124], k
[125], k
[126], k
[127]);
80 RND03(w
[128], w
[129], w
[130], w
[131], k
[128], k
[129], k
[130], k
[131]);
84 key
->subkeys
[i
][j
] = k
[4*i
+j
];
87 void serpent_encrypt(struct keyInstance
*key
,
88 uint8_t plaintext
[16],
89 uint8_t ciphertext
[16])
91 register uint32_t x0
, x1
, x2
, x3
;
92 register uint32_t y0
, y1
, y2
, y3
;
94 x0
=GET_32BIT_MSB_FIRST(plaintext
+12);
95 x1
=GET_32BIT_MSB_FIRST(plaintext
+8);
96 x2
=GET_32BIT_MSB_FIRST(plaintext
+4);
97 x3
=GET_32BIT_MSB_FIRST(plaintext
);
99 /* Start to encrypt the plaintext x */
100 keying(x0
, x1
, x2
, x3
, key
->subkeys
[ 0]);
101 RND00(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
102 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
103 keying(x0
, x1
, x2
, x3
, key
->subkeys
[ 1]);
104 RND01(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
105 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
106 keying(x0
, x1
, x2
, x3
, key
->subkeys
[ 2]);
107 RND02(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
108 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
109 keying(x0
, x1
, x2
, x3
, key
->subkeys
[ 3]);
110 RND03(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
111 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
112 keying(x0
, x1
, x2
, x3
, key
->subkeys
[ 4]);
113 RND04(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
114 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
115 keying(x0
, x1
, x2
, x3
, key
->subkeys
[ 5]);
116 RND05(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
117 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
118 keying(x0
, x1
, x2
, x3
, key
->subkeys
[ 6]);
119 RND06(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
120 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
121 keying(x0
, x1
, x2
, x3
, key
->subkeys
[ 7]);
122 RND07(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
123 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
124 keying(x0
, x1
, x2
, x3
, key
->subkeys
[ 8]);
125 RND08(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
126 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
127 keying(x0
, x1
, x2
, x3
, key
->subkeys
[ 9]);
128 RND09(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
129 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
130 keying(x0
, x1
, x2
, x3
, key
->subkeys
[10]);
131 RND10(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
132 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
133 keying(x0
, x1
, x2
, x3
, key
->subkeys
[11]);
134 RND11(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
135 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
136 keying(x0
, x1
, x2
, x3
, key
->subkeys
[12]);
137 RND12(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
138 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
139 keying(x0
, x1
, x2
, x3
, key
->subkeys
[13]);
140 RND13(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
141 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
142 keying(x0
, x1
, x2
, x3
, key
->subkeys
[14]);
143 RND14(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
144 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
145 keying(x0
, x1
, x2
, x3
, key
->subkeys
[15]);
146 RND15(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
147 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
148 keying(x0
, x1
, x2
, x3
, key
->subkeys
[16]);
149 RND16(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
150 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
151 keying(x0
, x1
, x2
, x3
, key
->subkeys
[17]);
152 RND17(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
153 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
154 keying(x0
, x1
, x2
, x3
, key
->subkeys
[18]);
155 RND18(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
156 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
157 keying(x0
, x1
, x2
, x3
, key
->subkeys
[19]);
158 RND19(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
159 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
160 keying(x0
, x1
, x2
, x3
, key
->subkeys
[20]);
161 RND20(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
162 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
163 keying(x0
, x1
, x2
, x3
, key
->subkeys
[21]);
164 RND21(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
165 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
166 keying(x0
, x1
, x2
, x3
, key
->subkeys
[22]);
167 RND22(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
168 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
169 keying(x0
, x1
, x2
, x3
, key
->subkeys
[23]);
170 RND23(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
171 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
172 keying(x0
, x1
, x2
, x3
, key
->subkeys
[24]);
173 RND24(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
174 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
175 keying(x0
, x1
, x2
, x3
, key
->subkeys
[25]);
176 RND25(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
177 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
178 keying(x0
, x1
, x2
, x3
, key
->subkeys
[26]);
179 RND26(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
180 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
181 keying(x0
, x1
, x2
, x3
, key
->subkeys
[27]);
182 RND27(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
183 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
184 keying(x0
, x1
, x2
, x3
, key
->subkeys
[28]);
185 RND28(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
186 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
187 keying(x0
, x1
, x2
, x3
, key
->subkeys
[29]);
188 RND29(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
189 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
190 keying(x0
, x1
, x2
, x3
, key
->subkeys
[30]);
191 RND30(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
192 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
193 keying(x0
, x1
, x2
, x3
, key
->subkeys
[31]);
194 RND31(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
195 x0
= y0
; x1
= y1
; x2
= y2
; x3
= y3
;
196 keying(x0
, x1
, x2
, x3
, key
->subkeys
[32]);
197 /* The ciphertext is now in x */
199 PUT_32BIT_MSB_FIRST(ciphertext
+12, x0
);
200 PUT_32BIT_MSB_FIRST(ciphertext
+8, x1
);
201 PUT_32BIT_MSB_FIRST(ciphertext
+4, x2
);
202 PUT_32BIT_MSB_FIRST(ciphertext
, x3
);
205 void serpent_decrypt(struct keyInstance
*key
,
206 uint8_t ciphertext
[16],
207 uint8_t plaintext
[16])
209 register uint32_t x0
, x1
, x2
, x3
;
210 register uint32_t y0
, y1
, y2
, y3
;
212 x0
=GET_32BIT_MSB_FIRST(ciphertext
+12);
213 x1
=GET_32BIT_MSB_FIRST(ciphertext
+8);
214 x2
=GET_32BIT_MSB_FIRST(ciphertext
+4);
215 x3
=GET_32BIT_MSB_FIRST(ciphertext
);
217 /* Start to decrypt the ciphertext x */
218 keying(x0
, x1
, x2
, x3
, key
->subkeys
[32]);
219 InvRND31(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
220 keying(y0
, y1
, y2
, y3
, key
->subkeys
[31]);
221 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
222 InvRND30(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
223 keying(y0
, y1
, y2
, y3
, key
->subkeys
[30]);
224 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
225 InvRND29(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
226 keying(y0
, y1
, y2
, y3
, key
->subkeys
[29]);
227 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
228 InvRND28(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
229 keying(y0
, y1
, y2
, y3
, key
->subkeys
[28]);
230 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
231 InvRND27(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
232 keying(y0
, y1
, y2
, y3
, key
->subkeys
[27]);
233 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
234 InvRND26(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
235 keying(y0
, y1
, y2
, y3
, key
->subkeys
[26]);
236 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
237 InvRND25(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
238 keying(y0
, y1
, y2
, y3
, key
->subkeys
[25]);
239 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
240 InvRND24(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
241 keying(y0
, y1
, y2
, y3
, key
->subkeys
[24]);
242 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
243 InvRND23(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
244 keying(y0
, y1
, y2
, y3
, key
->subkeys
[23]);
245 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
246 InvRND22(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
247 keying(y0
, y1
, y2
, y3
, key
->subkeys
[22]);
248 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
249 InvRND21(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
250 keying(y0
, y1
, y2
, y3
, key
->subkeys
[21]);
251 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
252 InvRND20(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
253 keying(y0
, y1
, y2
, y3
, key
->subkeys
[20]);
254 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
255 InvRND19(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
256 keying(y0
, y1
, y2
, y3
, key
->subkeys
[19]);
257 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
258 InvRND18(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
259 keying(y0
, y1
, y2
, y3
, key
->subkeys
[18]);
260 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
261 InvRND17(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
262 keying(y0
, y1
, y2
, y3
, key
->subkeys
[17]);
263 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
264 InvRND16(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
265 keying(y0
, y1
, y2
, y3
, key
->subkeys
[16]);
266 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
267 InvRND15(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
268 keying(y0
, y1
, y2
, y3
, key
->subkeys
[15]);
269 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
270 InvRND14(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
271 keying(y0
, y1
, y2
, y3
, key
->subkeys
[14]);
272 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
273 InvRND13(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
274 keying(y0
, y1
, y2
, y3
, key
->subkeys
[13]);
275 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
276 InvRND12(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
277 keying(y0
, y1
, y2
, y3
, key
->subkeys
[12]);
278 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
279 InvRND11(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
280 keying(y0
, y1
, y2
, y3
, key
->subkeys
[11]);
281 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
282 InvRND10(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
283 keying(y0
, y1
, y2
, y3
, key
->subkeys
[10]);
284 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
285 InvRND09(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
286 keying(y0
, y1
, y2
, y3
, key
->subkeys
[ 9]);
287 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
288 InvRND08(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
289 keying(y0
, y1
, y2
, y3
, key
->subkeys
[ 8]);
290 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
291 InvRND07(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
292 keying(y0
, y1
, y2
, y3
, key
->subkeys
[ 7]);
293 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
294 InvRND06(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
295 keying(y0
, y1
, y2
, y3
, key
->subkeys
[ 6]);
296 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
297 InvRND05(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
298 keying(y0
, y1
, y2
, y3
, key
->subkeys
[ 5]);
299 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
300 InvRND04(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
301 keying(y0
, y1
, y2
, y3
, key
->subkeys
[ 4]);
302 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
303 InvRND03(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
304 keying(y0
, y1
, y2
, y3
, key
->subkeys
[ 3]);
305 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
306 InvRND02(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
307 keying(y0
, y1
, y2
, y3
, key
->subkeys
[ 2]);
308 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
309 InvRND01(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
310 keying(y0
, y1
, y2
, y3
, key
->subkeys
[ 1]);
311 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
312 InvRND00(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
313 x0
= y0
; x1
= y1
; x2
= y2
; x3
= y3
;
314 keying(x0
, x1
, x2
, x3
, key
->subkeys
[ 0]);
315 /* The plaintext is now in x */
317 PUT_32BIT_MSB_FIRST(plaintext
+12, x0
);
318 PUT_32BIT_MSB_FIRST(plaintext
+8, x1
);
319 PUT_32BIT_MSB_FIRST(plaintext
+4, x2
);
320 PUT_32BIT_MSB_FIRST(plaintext
, x3
);