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
,
33 uint32_t w
[132],k
[132];
35 for(i
=0; i
<keyLen
/32; i
++)
36 w
[i
]=GET_32BIT_MSB_FIRST(keyMaterial
+ (keyLen
/8 - i
*4) - 4);
38 w
[i
]=(GET_32BIT_MSB_FIRST(keyMaterial
+ (keyLen
/8 - i
*4) - 4)
39 & ((1L<<((keyLen
&31)))-1)) | (1L<<((keyLen
&31)));
43 w
[i
]=ROL(w
[i
-8]^w
[i
-5]^w
[i
-3]^w
[i
-1]^PHI
^(i
-8),11);
47 w
[i
]=ROL(w
[i
-8]^w
[i
-5]^w
[i
-3]^w
[i
-1]^PHI
^i
,11);
49 RND03(w
[ 0], w
[ 1], w
[ 2], w
[ 3], k
[ 0], k
[ 1], k
[ 2], k
[ 3]);
50 RND02(w
[ 4], w
[ 5], w
[ 6], w
[ 7], k
[ 4], k
[ 5], k
[ 6], k
[ 7]);
51 RND01(w
[ 8], w
[ 9], w
[ 10], w
[ 11], k
[ 8], k
[ 9], k
[ 10], k
[ 11]);
52 RND00(w
[ 12], w
[ 13], w
[ 14], w
[ 15], k
[ 12], k
[ 13], k
[ 14], k
[ 15]);
53 RND31(w
[ 16], w
[ 17], w
[ 18], w
[ 19], k
[ 16], k
[ 17], k
[ 18], k
[ 19]);
54 RND30(w
[ 20], w
[ 21], w
[ 22], w
[ 23], k
[ 20], k
[ 21], k
[ 22], k
[ 23]);
55 RND29(w
[ 24], w
[ 25], w
[ 26], w
[ 27], k
[ 24], k
[ 25], k
[ 26], k
[ 27]);
56 RND28(w
[ 28], w
[ 29], w
[ 30], w
[ 31], k
[ 28], k
[ 29], k
[ 30], k
[ 31]);
57 RND27(w
[ 32], w
[ 33], w
[ 34], w
[ 35], k
[ 32], k
[ 33], k
[ 34], k
[ 35]);
58 RND26(w
[ 36], w
[ 37], w
[ 38], w
[ 39], k
[ 36], k
[ 37], k
[ 38], k
[ 39]);
59 RND25(w
[ 40], w
[ 41], w
[ 42], w
[ 43], k
[ 40], k
[ 41], k
[ 42], k
[ 43]);
60 RND24(w
[ 44], w
[ 45], w
[ 46], w
[ 47], k
[ 44], k
[ 45], k
[ 46], k
[ 47]);
61 RND23(w
[ 48], w
[ 49], w
[ 50], w
[ 51], k
[ 48], k
[ 49], k
[ 50], k
[ 51]);
62 RND22(w
[ 52], w
[ 53], w
[ 54], w
[ 55], k
[ 52], k
[ 53], k
[ 54], k
[ 55]);
63 RND21(w
[ 56], w
[ 57], w
[ 58], w
[ 59], k
[ 56], k
[ 57], k
[ 58], k
[ 59]);
64 RND20(w
[ 60], w
[ 61], w
[ 62], w
[ 63], k
[ 60], k
[ 61], k
[ 62], k
[ 63]);
65 RND19(w
[ 64], w
[ 65], w
[ 66], w
[ 67], k
[ 64], k
[ 65], k
[ 66], k
[ 67]);
66 RND18(w
[ 68], w
[ 69], w
[ 70], w
[ 71], k
[ 68], k
[ 69], k
[ 70], k
[ 71]);
67 RND17(w
[ 72], w
[ 73], w
[ 74], w
[ 75], k
[ 72], k
[ 73], k
[ 74], k
[ 75]);
68 RND16(w
[ 76], w
[ 77], w
[ 78], w
[ 79], k
[ 76], k
[ 77], k
[ 78], k
[ 79]);
69 RND15(w
[ 80], w
[ 81], w
[ 82], w
[ 83], k
[ 80], k
[ 81], k
[ 82], k
[ 83]);
70 RND14(w
[ 84], w
[ 85], w
[ 86], w
[ 87], k
[ 84], k
[ 85], k
[ 86], k
[ 87]);
71 RND13(w
[ 88], w
[ 89], w
[ 90], w
[ 91], k
[ 88], k
[ 89], k
[ 90], k
[ 91]);
72 RND12(w
[ 92], w
[ 93], w
[ 94], w
[ 95], k
[ 92], k
[ 93], k
[ 94], k
[ 95]);
73 RND11(w
[ 96], w
[ 97], w
[ 98], w
[ 99], k
[ 96], k
[ 97], k
[ 98], k
[ 99]);
74 RND10(w
[100], w
[101], w
[102], w
[103], k
[100], k
[101], k
[102], k
[103]);
75 RND09(w
[104], w
[105], w
[106], w
[107], k
[104], k
[105], k
[106], k
[107]);
76 RND08(w
[108], w
[109], w
[110], w
[111], k
[108], k
[109], k
[110], k
[111]);
77 RND07(w
[112], w
[113], w
[114], w
[115], k
[112], k
[113], k
[114], k
[115]);
78 RND06(w
[116], w
[117], w
[118], w
[119], k
[116], k
[117], k
[118], k
[119]);
79 RND05(w
[120], w
[121], w
[122], w
[123], k
[120], k
[121], k
[122], k
[123]);
80 RND04(w
[124], w
[125], w
[126], w
[127], k
[124], k
[125], k
[126], k
[127]);
81 RND03(w
[128], w
[129], w
[130], w
[131], k
[128], k
[129], k
[130], k
[131]);
85 key
->subkeys
[i
][j
] = k
[4*i
+j
];
88 void serpent_encrypt(struct keyInstance
*key
,
89 uint8_t plaintext
[16],
90 uint8_t ciphertext
[16])
92 register uint32_t x0
, x1
, x2
, x3
;
93 register uint32_t y0
, y1
, y2
, y3
;
95 x0
=GET_32BIT_MSB_FIRST(plaintext
+12);
96 x1
=GET_32BIT_MSB_FIRST(plaintext
+8);
97 x2
=GET_32BIT_MSB_FIRST(plaintext
+4);
98 x3
=GET_32BIT_MSB_FIRST(plaintext
);
100 /* Start to encrypt the plaintext x */
101 keying(x0
, x1
, x2
, x3
, key
->subkeys
[ 0]);
102 RND00(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
103 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
104 keying(x0
, x1
, x2
, x3
, key
->subkeys
[ 1]);
105 RND01(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
106 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
107 keying(x0
, x1
, x2
, x3
, key
->subkeys
[ 2]);
108 RND02(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
109 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
110 keying(x0
, x1
, x2
, x3
, key
->subkeys
[ 3]);
111 RND03(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
112 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
113 keying(x0
, x1
, x2
, x3
, key
->subkeys
[ 4]);
114 RND04(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
115 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
116 keying(x0
, x1
, x2
, x3
, key
->subkeys
[ 5]);
117 RND05(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
118 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
119 keying(x0
, x1
, x2
, x3
, key
->subkeys
[ 6]);
120 RND06(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
121 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
122 keying(x0
, x1
, x2
, x3
, key
->subkeys
[ 7]);
123 RND07(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
124 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
125 keying(x0
, x1
, x2
, x3
, key
->subkeys
[ 8]);
126 RND08(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
127 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
128 keying(x0
, x1
, x2
, x3
, key
->subkeys
[ 9]);
129 RND09(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
130 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
131 keying(x0
, x1
, x2
, x3
, key
->subkeys
[10]);
132 RND10(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
133 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
134 keying(x0
, x1
, x2
, x3
, key
->subkeys
[11]);
135 RND11(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
136 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
137 keying(x0
, x1
, x2
, x3
, key
->subkeys
[12]);
138 RND12(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
139 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
140 keying(x0
, x1
, x2
, x3
, key
->subkeys
[13]);
141 RND13(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
142 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
143 keying(x0
, x1
, x2
, x3
, key
->subkeys
[14]);
144 RND14(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
145 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
146 keying(x0
, x1
, x2
, x3
, key
->subkeys
[15]);
147 RND15(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
148 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
149 keying(x0
, x1
, x2
, x3
, key
->subkeys
[16]);
150 RND16(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
151 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
152 keying(x0
, x1
, x2
, x3
, key
->subkeys
[17]);
153 RND17(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
154 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
155 keying(x0
, x1
, x2
, x3
, key
->subkeys
[18]);
156 RND18(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
157 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
158 keying(x0
, x1
, x2
, x3
, key
->subkeys
[19]);
159 RND19(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
160 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
161 keying(x0
, x1
, x2
, x3
, key
->subkeys
[20]);
162 RND20(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
163 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
164 keying(x0
, x1
, x2
, x3
, key
->subkeys
[21]);
165 RND21(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
166 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
167 keying(x0
, x1
, x2
, x3
, key
->subkeys
[22]);
168 RND22(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
169 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
170 keying(x0
, x1
, x2
, x3
, key
->subkeys
[23]);
171 RND23(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
172 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
173 keying(x0
, x1
, x2
, x3
, key
->subkeys
[24]);
174 RND24(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
175 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
176 keying(x0
, x1
, x2
, x3
, key
->subkeys
[25]);
177 RND25(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
178 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
179 keying(x0
, x1
, x2
, x3
, key
->subkeys
[26]);
180 RND26(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
181 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
182 keying(x0
, x1
, x2
, x3
, key
->subkeys
[27]);
183 RND27(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
184 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
185 keying(x0
, x1
, x2
, x3
, key
->subkeys
[28]);
186 RND28(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
187 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
188 keying(x0
, x1
, x2
, x3
, key
->subkeys
[29]);
189 RND29(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
190 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
191 keying(x0
, x1
, x2
, x3
, key
->subkeys
[30]);
192 RND30(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
193 transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
194 keying(x0
, x1
, x2
, x3
, key
->subkeys
[31]);
195 RND31(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
196 x0
= y0
; x1
= y1
; x2
= y2
; x3
= y3
;
197 keying(x0
, x1
, x2
, x3
, key
->subkeys
[32]);
198 /* The ciphertext is now in x */
200 PUT_32BIT_MSB_FIRST(ciphertext
+12, x0
);
201 PUT_32BIT_MSB_FIRST(ciphertext
+8, x1
);
202 PUT_32BIT_MSB_FIRST(ciphertext
+4, x2
);
203 PUT_32BIT_MSB_FIRST(ciphertext
, x3
);
206 void serpent_decrypt(struct keyInstance
*key
,
207 uint8_t ciphertext
[16],
208 uint8_t plaintext
[16])
210 register uint32_t x0
, x1
, x2
, x3
;
211 register uint32_t y0
, y1
, y2
, y3
;
213 x0
=GET_32BIT_MSB_FIRST(ciphertext
+12);
214 x1
=GET_32BIT_MSB_FIRST(ciphertext
+8);
215 x2
=GET_32BIT_MSB_FIRST(ciphertext
+4);
216 x3
=GET_32BIT_MSB_FIRST(ciphertext
);
218 /* Start to decrypt the ciphertext x */
219 keying(x0
, x1
, x2
, x3
, key
->subkeys
[32]);
220 InvRND31(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
221 keying(y0
, y1
, y2
, y3
, key
->subkeys
[31]);
222 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
223 InvRND30(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
224 keying(y0
, y1
, y2
, y3
, key
->subkeys
[30]);
225 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
226 InvRND29(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
227 keying(y0
, y1
, y2
, y3
, key
->subkeys
[29]);
228 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
229 InvRND28(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
230 keying(y0
, y1
, y2
, y3
, key
->subkeys
[28]);
231 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
232 InvRND27(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
233 keying(y0
, y1
, y2
, y3
, key
->subkeys
[27]);
234 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
235 InvRND26(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
236 keying(y0
, y1
, y2
, y3
, key
->subkeys
[26]);
237 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
238 InvRND25(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
239 keying(y0
, y1
, y2
, y3
, key
->subkeys
[25]);
240 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
241 InvRND24(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
242 keying(y0
, y1
, y2
, y3
, key
->subkeys
[24]);
243 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
244 InvRND23(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
245 keying(y0
, y1
, y2
, y3
, key
->subkeys
[23]);
246 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
247 InvRND22(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
248 keying(y0
, y1
, y2
, y3
, key
->subkeys
[22]);
249 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
250 InvRND21(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
251 keying(y0
, y1
, y2
, y3
, key
->subkeys
[21]);
252 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
253 InvRND20(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
254 keying(y0
, y1
, y2
, y3
, key
->subkeys
[20]);
255 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
256 InvRND19(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
257 keying(y0
, y1
, y2
, y3
, key
->subkeys
[19]);
258 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
259 InvRND18(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
260 keying(y0
, y1
, y2
, y3
, key
->subkeys
[18]);
261 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
262 InvRND17(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
263 keying(y0
, y1
, y2
, y3
, key
->subkeys
[17]);
264 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
265 InvRND16(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
266 keying(y0
, y1
, y2
, y3
, key
->subkeys
[16]);
267 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
268 InvRND15(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
269 keying(y0
, y1
, y2
, y3
, key
->subkeys
[15]);
270 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
271 InvRND14(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
272 keying(y0
, y1
, y2
, y3
, key
->subkeys
[14]);
273 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
274 InvRND13(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
275 keying(y0
, y1
, y2
, y3
, key
->subkeys
[13]);
276 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
277 InvRND12(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
278 keying(y0
, y1
, y2
, y3
, key
->subkeys
[12]);
279 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
280 InvRND11(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
281 keying(y0
, y1
, y2
, y3
, key
->subkeys
[11]);
282 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
283 InvRND10(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
284 keying(y0
, y1
, y2
, y3
, key
->subkeys
[10]);
285 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
286 InvRND09(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
287 keying(y0
, y1
, y2
, y3
, key
->subkeys
[ 9]);
288 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
289 InvRND08(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
290 keying(y0
, y1
, y2
, y3
, key
->subkeys
[ 8]);
291 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
292 InvRND07(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
293 keying(y0
, y1
, y2
, y3
, key
->subkeys
[ 7]);
294 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
295 InvRND06(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
296 keying(y0
, y1
, y2
, y3
, key
->subkeys
[ 6]);
297 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
298 InvRND05(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
299 keying(y0
, y1
, y2
, y3
, key
->subkeys
[ 5]);
300 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
301 InvRND04(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
302 keying(y0
, y1
, y2
, y3
, key
->subkeys
[ 4]);
303 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
304 InvRND03(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
305 keying(y0
, y1
, y2
, y3
, key
->subkeys
[ 3]);
306 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
307 InvRND02(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
308 keying(y0
, y1
, y2
, y3
, key
->subkeys
[ 2]);
309 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
310 InvRND01(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
311 keying(y0
, y1
, y2
, y3
, key
->subkeys
[ 1]);
312 inv_transform(y0
, y1
, y2
, y3
, x0
, x1
, x2
, x3
);
313 InvRND00(x0
, x1
, x2
, x3
, y0
, y1
, y2
, y3
);
314 x0
= y0
; x1
= y1
; x2
= y2
; x3
= y3
;
315 keying(x0
, x1
, x2
, x3
, key
->subkeys
[ 0]);
316 /* The plaintext is now in x */
318 PUT_32BIT_MSB_FIRST(plaintext
+12, x0
);
319 PUT_32BIT_MSB_FIRST(plaintext
+8, x1
);
320 PUT_32BIT_MSB_FIRST(plaintext
+4, x2
);
321 PUT_32BIT_MSB_FIRST(plaintext
, x3
);