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1/**
2 * \file des.h
3 *
4 * \brief DES block cipher
5 *
6 * \warning DES is considered a weak cipher and its use constitutes a
7 * security risk. We recommend considering stronger ciphers
8 * instead.
9 */
10/*
11 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
12 * SPDX-License-Identifier: GPL-2.0
13 *
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
18 *
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
23 *
24 * You should have received a copy of the GNU General Public License along
25 * with this program; if not, write to the Free Software Foundation, Inc.,
26 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
27 *
28 * This file is part of mbed TLS (https://tls.mbed.org)
29 *
30 */
31#ifndef MBEDTLS_DES_H
32#define MBEDTLS_DES_H
33
34#if !defined(MBEDTLS_CONFIG_FILE)
35#include "config.h"
36#else
37#include MBEDTLS_CONFIG_FILE
38#endif
39
40#include <stddef.h>
41#include <stdint.h>
42
43#define MBEDTLS_DES_ENCRYPT 1
44#define MBEDTLS_DES_DECRYPT 0
45
46#define MBEDTLS_ERR_DES_INVALID_INPUT_LENGTH -0x0032 /**< The data input has an invalid length. */
47#define MBEDTLS_ERR_DES_HW_ACCEL_FAILED -0x0033 /**< DES hardware accelerator failed. */
48
49#define MBEDTLS_DES_KEY_SIZE 8
50
51#ifdef __cplusplus
52extern "C" {
53#endif
54
55#if !defined(MBEDTLS_DES_ALT)
56// Regular implementation
57//
58
59/**
60 * \brief DES context structure
61 *
62 * \warning DES is considered a weak cipher and its use constitutes a
63 * security risk. We recommend considering stronger ciphers
64 * instead.
65 */
66typedef struct mbedtls_des_context
67{
68 uint32_t sk[32]; /*!< DES subkeys */
69}
70mbedtls_des_context;
71
72/**
73 * \brief Triple-DES context structure
74 */
75typedef struct mbedtls_des3_context
76{
77 uint32_t sk[96]; /*!< 3DES subkeys */
78}
79mbedtls_des3_context;
80
81#else /* MBEDTLS_DES_ALT */
82#include "des_alt.h"
83#endif /* MBEDTLS_DES_ALT */
84
85/**
86 * \brief Initialize DES context
87 *
88 * \param ctx DES context to be initialized
89 *
90 * \warning DES is considered a weak cipher and its use constitutes a
91 * security risk. We recommend considering stronger ciphers
92 * instead.
93 */
94void mbedtls_des_init( mbedtls_des_context *ctx );
95
96/**
97 * \brief Clear DES context
98 *
99 * \param ctx DES context to be cleared
100 *
101 * \warning DES is considered a weak cipher and its use constitutes a
102 * security risk. We recommend considering stronger ciphers
103 * instead.
104 */
105void mbedtls_des_free( mbedtls_des_context *ctx );
106
107/**
108 * \brief Initialize Triple-DES context
109 *
110 * \param ctx DES3 context to be initialized
111 */
112void mbedtls_des3_init( mbedtls_des3_context *ctx );
113
114/**
115 * \brief Clear Triple-DES context
116 *
117 * \param ctx DES3 context to be cleared
118 */
119void mbedtls_des3_free( mbedtls_des3_context *ctx );
120
121/**
122 * \brief Set key parity on the given key to odd.
123 *
124 * DES keys are 56 bits long, but each byte is padded with
125 * a parity bit to allow verification.
126 *
127 * \param key 8-byte secret key
128 *
129 * \warning DES is considered a weak cipher and its use constitutes a
130 * security risk. We recommend considering stronger ciphers
131 * instead.
132 */
133void mbedtls_des_key_set_parity( unsigned char key[MBEDTLS_DES_KEY_SIZE] );
134
135/**
136 * \brief Check that key parity on the given key is odd.
137 *
138 * DES keys are 56 bits long, but each byte is padded with
139 * a parity bit to allow verification.
140 *
141 * \param key 8-byte secret key
142 *
143 * \return 0 is parity was ok, 1 if parity was not correct.
144 *
145 * \warning DES is considered a weak cipher and its use constitutes a
146 * security risk. We recommend considering stronger ciphers
147 * instead.
148 */
149int mbedtls_des_key_check_key_parity( const unsigned char key[MBEDTLS_DES_KEY_SIZE] );
150
151/**
152 * \brief Check that key is not a weak or semi-weak DES key
153 *
154 * \param key 8-byte secret key
155 *
156 * \return 0 if no weak key was found, 1 if a weak key was identified.
157 *
158 * \warning DES is considered a weak cipher and its use constitutes a
159 * security risk. We recommend considering stronger ciphers
160 * instead.
161 */
162int mbedtls_des_key_check_weak( const unsigned char key[MBEDTLS_DES_KEY_SIZE] );
163
164/**
165 * \brief DES key schedule (56-bit, encryption)
166 *
167 * \param ctx DES context to be initialized
168 * \param key 8-byte secret key
169 *
170 * \return 0
171 *
172 * \warning DES is considered a weak cipher and its use constitutes a
173 * security risk. We recommend considering stronger ciphers
174 * instead.
175 */
176int mbedtls_des_setkey_enc( mbedtls_des_context *ctx, const unsigned char key[MBEDTLS_DES_KEY_SIZE] );
177
178/**
179 * \brief DES key schedule (56-bit, decryption)
180 *
181 * \param ctx DES context to be initialized
182 * \param key 8-byte secret key
183 *
184 * \return 0
185 *
186 * \warning DES is considered a weak cipher and its use constitutes a
187 * security risk. We recommend considering stronger ciphers
188 * instead.
189 */
190int mbedtls_des_setkey_dec( mbedtls_des_context *ctx, const unsigned char key[MBEDTLS_DES_KEY_SIZE] );
191
192/**
193 * \brief Triple-DES key schedule (112-bit, encryption)
194 *
195 * \param ctx 3DES context to be initialized
196 * \param key 16-byte secret key
197 *
198 * \return 0
199 */
200int mbedtls_des3_set2key_enc( mbedtls_des3_context *ctx,
201 const unsigned char key[MBEDTLS_DES_KEY_SIZE * 2] );
202
203/**
204 * \brief Triple-DES key schedule (112-bit, decryption)
205 *
206 * \param ctx 3DES context to be initialized
207 * \param key 16-byte secret key
208 *
209 * \return 0
210 */
211int mbedtls_des3_set2key_dec( mbedtls_des3_context *ctx,
212 const unsigned char key[MBEDTLS_DES_KEY_SIZE * 2] );
213
214/**
215 * \brief Triple-DES key schedule (168-bit, encryption)
216 *
217 * \param ctx 3DES context to be initialized
218 * \param key 24-byte secret key
219 *
220 * \return 0
221 */
222int mbedtls_des3_set3key_enc( mbedtls_des3_context *ctx,
223 const unsigned char key[MBEDTLS_DES_KEY_SIZE * 3] );
224
225/**
226 * \brief Triple-DES key schedule (168-bit, decryption)
227 *
228 * \param ctx 3DES context to be initialized
229 * \param key 24-byte secret key
230 *
231 * \return 0
232 */
233int mbedtls_des3_set3key_dec( mbedtls_des3_context *ctx,
234 const unsigned char key[MBEDTLS_DES_KEY_SIZE * 3] );
235
236/**
237 * \brief DES-ECB block encryption/decryption
238 *
239 * \param ctx DES context
240 * \param input 64-bit input block
241 * \param output 64-bit output block
242 *
243 * \return 0 if successful
244 *
245 * \warning DES is considered a weak cipher and its use constitutes a
246 * security risk. We recommend considering stronger ciphers
247 * instead.
248 */
249int mbedtls_des_crypt_ecb( mbedtls_des_context *ctx,
250 const unsigned char input[8],
251 unsigned char output[8] );
252
253#if defined(MBEDTLS_CIPHER_MODE_CBC)
254/**
255 * \brief DES-CBC buffer encryption/decryption
256 *
257 * \note Upon exit, the content of the IV is updated so that you can
258 * call the function same function again on the following
259 * block(s) of data and get the same result as if it was
260 * encrypted in one call. This allows a "streaming" usage.
261 * If on the other hand you need to retain the contents of the
262 * IV, you should either save it manually or use the cipher
263 * module instead.
264 *
265 * \param ctx DES context
266 * \param mode MBEDTLS_DES_ENCRYPT or MBEDTLS_DES_DECRYPT
267 * \param length length of the input data
268 * \param iv initialization vector (updated after use)
269 * \param input buffer holding the input data
270 * \param output buffer holding the output data
271 *
272 * \warning DES is considered a weak cipher and its use constitutes a
273 * security risk. We recommend considering stronger ciphers
274 * instead.
275 */
276int mbedtls_des_crypt_cbc( mbedtls_des_context *ctx,
277 int mode,
278 size_t length,
279 unsigned char iv[8],
280 const unsigned char *input,
281 unsigned char *output );
282#endif /* MBEDTLS_CIPHER_MODE_CBC */
283
284/**
285 * \brief 3DES-ECB block encryption/decryption
286 *
287 * \param ctx 3DES context
288 * \param input 64-bit input block
289 * \param output 64-bit output block
290 *
291 * \return 0 if successful
292 */
293int mbedtls_des3_crypt_ecb( mbedtls_des3_context *ctx,
294 const unsigned char input[8],
295 unsigned char output[8] );
296
297#if defined(MBEDTLS_CIPHER_MODE_CBC)
298/**
299 * \brief 3DES-CBC buffer encryption/decryption
300 *
301 * \note Upon exit, the content of the IV is updated so that you can
302 * call the function same function again on the following
303 * block(s) of data and get the same result as if it was
304 * encrypted in one call. This allows a "streaming" usage.
305 * If on the other hand you need to retain the contents of the
306 * IV, you should either save it manually or use the cipher
307 * module instead.
308 *
309 * \param ctx 3DES context
310 * \param mode MBEDTLS_DES_ENCRYPT or MBEDTLS_DES_DECRYPT
311 * \param length length of the input data
312 * \param iv initialization vector (updated after use)
313 * \param input buffer holding the input data
314 * \param output buffer holding the output data
315 *
316 * \return 0 if successful, or MBEDTLS_ERR_DES_INVALID_INPUT_LENGTH
317 */
318int mbedtls_des3_crypt_cbc( mbedtls_des3_context *ctx,
319 int mode,
320 size_t length,
321 unsigned char iv[8],
322 const unsigned char *input,
323 unsigned char *output );
324#endif /* MBEDTLS_CIPHER_MODE_CBC */
325
326/**
327 * \brief Internal function for key expansion.
328 * (Only exposed to allow overriding it,
329 * see MBEDTLS_DES_SETKEY_ALT)
330 *
331 * \param SK Round keys
332 * \param key Base key
333 *
334 * \warning DES is considered a weak cipher and its use constitutes a
335 * security risk. We recommend considering stronger ciphers
336 * instead.
337 */
338void mbedtls_des_setkey( uint32_t SK[32],
339 const unsigned char key[MBEDTLS_DES_KEY_SIZE] );
340
341/**
342 * \brief Checkup routine
343 *
344 * \return 0 if successful, or 1 if the test failed
345 */
346int mbedtls_des_self_test( int verbose );
347
348#ifdef __cplusplus
349}
350#endif
351
352#endif /* des.h */
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