4 * \brief This file contains an abstraction interface for use with the cipher
\r
5 * primitives provided by the library. It provides a common interface to all of
\r
6 * the available cipher operations.
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8 * \author Adriaan de Jong <dejong@fox-it.com>
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11 * Copyright (C) 2006-2018, Arm Limited (or its affiliates), All Rights Reserved
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12 * SPDX-License-Identifier: Apache-2.0
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14 * Licensed under the Apache License, Version 2.0 (the "License"); you may
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15 * not use this file except in compliance with the License.
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16 * You may obtain a copy of the License at
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18 * http://www.apache.org/licenses/LICENSE-2.0
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20 * Unless required by applicable law or agreed to in writing, software
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21 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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22 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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23 * See the License for the specific language governing permissions and
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24 * limitations under the License.
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26 * This file is part of Mbed TLS (https://tls.mbed.org)
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29 #ifndef MBEDTLS_CIPHER_H
\r
30 #define MBEDTLS_CIPHER_H
\r
32 #if !defined(MBEDTLS_CONFIG_FILE)
\r
35 #include MBEDTLS_CONFIG_FILE
\r
39 #include "platform_util.h"
\r
41 #if defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CCM_C) || defined(MBEDTLS_CHACHAPOLY_C)
\r
42 #define MBEDTLS_CIPHER_MODE_AEAD
\r
45 #if defined(MBEDTLS_CIPHER_MODE_CBC)
\r
46 #define MBEDTLS_CIPHER_MODE_WITH_PADDING
\r
49 #if defined(MBEDTLS_ARC4_C) || defined(MBEDTLS_CIPHER_NULL_CIPHER) || \
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50 defined(MBEDTLS_CHACHA20_C)
\r
51 #define MBEDTLS_CIPHER_MODE_STREAM
\r
54 #if ( defined(__ARMCC_VERSION) || defined(_MSC_VER) ) && \
\r
55 !defined(inline) && !defined(__cplusplus)
\r
56 #define inline __inline
\r
59 #define MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE -0x6080 /**< The selected feature is not available. */
\r
60 #define MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA -0x6100 /**< Bad input parameters. */
\r
61 #define MBEDTLS_ERR_CIPHER_ALLOC_FAILED -0x6180 /**< Failed to allocate memory. */
\r
62 #define MBEDTLS_ERR_CIPHER_INVALID_PADDING -0x6200 /**< Input data contains invalid padding and is rejected. */
\r
63 #define MBEDTLS_ERR_CIPHER_FULL_BLOCK_EXPECTED -0x6280 /**< Decryption of block requires a full block. */
\r
64 #define MBEDTLS_ERR_CIPHER_AUTH_FAILED -0x6300 /**< Authentication failed (for AEAD modes). */
\r
65 #define MBEDTLS_ERR_CIPHER_INVALID_CONTEXT -0x6380 /**< The context is invalid. For example, because it was freed. */
\r
67 /* MBEDTLS_ERR_CIPHER_HW_ACCEL_FAILED is deprecated and should not be used. */
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68 #define MBEDTLS_ERR_CIPHER_HW_ACCEL_FAILED -0x6400 /**< Cipher hardware accelerator failed. */
\r
70 #define MBEDTLS_CIPHER_VARIABLE_IV_LEN 0x01 /**< Cipher accepts IVs of variable length. */
\r
71 #define MBEDTLS_CIPHER_VARIABLE_KEY_LEN 0x02 /**< Cipher accepts keys of variable length. */
\r
78 * \brief Supported cipher types.
\r
80 * \warning RC4 and DES are considered weak ciphers and their use
\r
81 * constitutes a security risk. Arm recommends considering stronger
\r
85 MBEDTLS_CIPHER_ID_NONE = 0, /**< Placeholder to mark the end of cipher ID lists. */
\r
86 MBEDTLS_CIPHER_ID_NULL, /**< The identity cipher, treated as a stream cipher. */
\r
87 MBEDTLS_CIPHER_ID_AES, /**< The AES cipher. */
\r
88 MBEDTLS_CIPHER_ID_DES, /**< The DES cipher. */
\r
89 MBEDTLS_CIPHER_ID_3DES, /**< The Triple DES cipher. */
\r
90 MBEDTLS_CIPHER_ID_CAMELLIA, /**< The Camellia cipher. */
\r
91 MBEDTLS_CIPHER_ID_BLOWFISH, /**< The Blowfish cipher. */
\r
92 MBEDTLS_CIPHER_ID_ARC4, /**< The RC4 cipher. */
\r
93 MBEDTLS_CIPHER_ID_ARIA, /**< The Aria cipher. */
\r
94 MBEDTLS_CIPHER_ID_CHACHA20, /**< The ChaCha20 cipher. */
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95 } mbedtls_cipher_id_t;
\r
98 * \brief Supported {cipher type, cipher mode} pairs.
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100 * \warning RC4 and DES are considered weak ciphers and their use
\r
101 * constitutes a security risk. Arm recommends considering stronger
\r
105 MBEDTLS_CIPHER_NONE = 0, /**< Placeholder to mark the end of cipher-pair lists. */
\r
106 MBEDTLS_CIPHER_NULL, /**< The identity stream cipher. */
\r
107 MBEDTLS_CIPHER_AES_128_ECB, /**< AES cipher with 128-bit ECB mode. */
\r
108 MBEDTLS_CIPHER_AES_192_ECB, /**< AES cipher with 192-bit ECB mode. */
\r
109 MBEDTLS_CIPHER_AES_256_ECB, /**< AES cipher with 256-bit ECB mode. */
\r
110 MBEDTLS_CIPHER_AES_128_CBC, /**< AES cipher with 128-bit CBC mode. */
\r
111 MBEDTLS_CIPHER_AES_192_CBC, /**< AES cipher with 192-bit CBC mode. */
\r
112 MBEDTLS_CIPHER_AES_256_CBC, /**< AES cipher with 256-bit CBC mode. */
\r
113 MBEDTLS_CIPHER_AES_128_CFB128, /**< AES cipher with 128-bit CFB128 mode. */
\r
114 MBEDTLS_CIPHER_AES_192_CFB128, /**< AES cipher with 192-bit CFB128 mode. */
\r
115 MBEDTLS_CIPHER_AES_256_CFB128, /**< AES cipher with 256-bit CFB128 mode. */
\r
116 MBEDTLS_CIPHER_AES_128_CTR, /**< AES cipher with 128-bit CTR mode. */
\r
117 MBEDTLS_CIPHER_AES_192_CTR, /**< AES cipher with 192-bit CTR mode. */
\r
118 MBEDTLS_CIPHER_AES_256_CTR, /**< AES cipher with 256-bit CTR mode. */
\r
119 MBEDTLS_CIPHER_AES_128_GCM, /**< AES cipher with 128-bit GCM mode. */
\r
120 MBEDTLS_CIPHER_AES_192_GCM, /**< AES cipher with 192-bit GCM mode. */
\r
121 MBEDTLS_CIPHER_AES_256_GCM, /**< AES cipher with 256-bit GCM mode. */
\r
122 MBEDTLS_CIPHER_CAMELLIA_128_ECB, /**< Camellia cipher with 128-bit ECB mode. */
\r
123 MBEDTLS_CIPHER_CAMELLIA_192_ECB, /**< Camellia cipher with 192-bit ECB mode. */
\r
124 MBEDTLS_CIPHER_CAMELLIA_256_ECB, /**< Camellia cipher with 256-bit ECB mode. */
\r
125 MBEDTLS_CIPHER_CAMELLIA_128_CBC, /**< Camellia cipher with 128-bit CBC mode. */
\r
126 MBEDTLS_CIPHER_CAMELLIA_192_CBC, /**< Camellia cipher with 192-bit CBC mode. */
\r
127 MBEDTLS_CIPHER_CAMELLIA_256_CBC, /**< Camellia cipher with 256-bit CBC mode. */
\r
128 MBEDTLS_CIPHER_CAMELLIA_128_CFB128, /**< Camellia cipher with 128-bit CFB128 mode. */
\r
129 MBEDTLS_CIPHER_CAMELLIA_192_CFB128, /**< Camellia cipher with 192-bit CFB128 mode. */
\r
130 MBEDTLS_CIPHER_CAMELLIA_256_CFB128, /**< Camellia cipher with 256-bit CFB128 mode. */
\r
131 MBEDTLS_CIPHER_CAMELLIA_128_CTR, /**< Camellia cipher with 128-bit CTR mode. */
\r
132 MBEDTLS_CIPHER_CAMELLIA_192_CTR, /**< Camellia cipher with 192-bit CTR mode. */
\r
133 MBEDTLS_CIPHER_CAMELLIA_256_CTR, /**< Camellia cipher with 256-bit CTR mode. */
\r
134 MBEDTLS_CIPHER_CAMELLIA_128_GCM, /**< Camellia cipher with 128-bit GCM mode. */
\r
135 MBEDTLS_CIPHER_CAMELLIA_192_GCM, /**< Camellia cipher with 192-bit GCM mode. */
\r
136 MBEDTLS_CIPHER_CAMELLIA_256_GCM, /**< Camellia cipher with 256-bit GCM mode. */
\r
137 MBEDTLS_CIPHER_DES_ECB, /**< DES cipher with ECB mode. */
\r
138 MBEDTLS_CIPHER_DES_CBC, /**< DES cipher with CBC mode. */
\r
139 MBEDTLS_CIPHER_DES_EDE_ECB, /**< DES cipher with EDE ECB mode. */
\r
140 MBEDTLS_CIPHER_DES_EDE_CBC, /**< DES cipher with EDE CBC mode. */
\r
141 MBEDTLS_CIPHER_DES_EDE3_ECB, /**< DES cipher with EDE3 ECB mode. */
\r
142 MBEDTLS_CIPHER_DES_EDE3_CBC, /**< DES cipher with EDE3 CBC mode. */
\r
143 MBEDTLS_CIPHER_BLOWFISH_ECB, /**< Blowfish cipher with ECB mode. */
\r
144 MBEDTLS_CIPHER_BLOWFISH_CBC, /**< Blowfish cipher with CBC mode. */
\r
145 MBEDTLS_CIPHER_BLOWFISH_CFB64, /**< Blowfish cipher with CFB64 mode. */
\r
146 MBEDTLS_CIPHER_BLOWFISH_CTR, /**< Blowfish cipher with CTR mode. */
\r
147 MBEDTLS_CIPHER_ARC4_128, /**< RC4 cipher with 128-bit mode. */
\r
148 MBEDTLS_CIPHER_AES_128_CCM, /**< AES cipher with 128-bit CCM mode. */
\r
149 MBEDTLS_CIPHER_AES_192_CCM, /**< AES cipher with 192-bit CCM mode. */
\r
150 MBEDTLS_CIPHER_AES_256_CCM, /**< AES cipher with 256-bit CCM mode. */
\r
151 MBEDTLS_CIPHER_CAMELLIA_128_CCM, /**< Camellia cipher with 128-bit CCM mode. */
\r
152 MBEDTLS_CIPHER_CAMELLIA_192_CCM, /**< Camellia cipher with 192-bit CCM mode. */
\r
153 MBEDTLS_CIPHER_CAMELLIA_256_CCM, /**< Camellia cipher with 256-bit CCM mode. */
\r
154 MBEDTLS_CIPHER_ARIA_128_ECB, /**< Aria cipher with 128-bit key and ECB mode. */
\r
155 MBEDTLS_CIPHER_ARIA_192_ECB, /**< Aria cipher with 192-bit key and ECB mode. */
\r
156 MBEDTLS_CIPHER_ARIA_256_ECB, /**< Aria cipher with 256-bit key and ECB mode. */
\r
157 MBEDTLS_CIPHER_ARIA_128_CBC, /**< Aria cipher with 128-bit key and CBC mode. */
\r
158 MBEDTLS_CIPHER_ARIA_192_CBC, /**< Aria cipher with 192-bit key and CBC mode. */
\r
159 MBEDTLS_CIPHER_ARIA_256_CBC, /**< Aria cipher with 256-bit key and CBC mode. */
\r
160 MBEDTLS_CIPHER_ARIA_128_CFB128, /**< Aria cipher with 128-bit key and CFB-128 mode. */
\r
161 MBEDTLS_CIPHER_ARIA_192_CFB128, /**< Aria cipher with 192-bit key and CFB-128 mode. */
\r
162 MBEDTLS_CIPHER_ARIA_256_CFB128, /**< Aria cipher with 256-bit key and CFB-128 mode. */
\r
163 MBEDTLS_CIPHER_ARIA_128_CTR, /**< Aria cipher with 128-bit key and CTR mode. */
\r
164 MBEDTLS_CIPHER_ARIA_192_CTR, /**< Aria cipher with 192-bit key and CTR mode. */
\r
165 MBEDTLS_CIPHER_ARIA_256_CTR, /**< Aria cipher with 256-bit key and CTR mode. */
\r
166 MBEDTLS_CIPHER_ARIA_128_GCM, /**< Aria cipher with 128-bit key and GCM mode. */
\r
167 MBEDTLS_CIPHER_ARIA_192_GCM, /**< Aria cipher with 192-bit key and GCM mode. */
\r
168 MBEDTLS_CIPHER_ARIA_256_GCM, /**< Aria cipher with 256-bit key and GCM mode. */
\r
169 MBEDTLS_CIPHER_ARIA_128_CCM, /**< Aria cipher with 128-bit key and CCM mode. */
\r
170 MBEDTLS_CIPHER_ARIA_192_CCM, /**< Aria cipher with 192-bit key and CCM mode. */
\r
171 MBEDTLS_CIPHER_ARIA_256_CCM, /**< Aria cipher with 256-bit key and CCM mode. */
\r
172 MBEDTLS_CIPHER_AES_128_OFB, /**< AES 128-bit cipher in OFB mode. */
\r
173 MBEDTLS_CIPHER_AES_192_OFB, /**< AES 192-bit cipher in OFB mode. */
\r
174 MBEDTLS_CIPHER_AES_256_OFB, /**< AES 256-bit cipher in OFB mode. */
\r
175 MBEDTLS_CIPHER_AES_128_XTS, /**< AES 128-bit cipher in XTS block mode. */
\r
176 MBEDTLS_CIPHER_AES_256_XTS, /**< AES 256-bit cipher in XTS block mode. */
\r
177 MBEDTLS_CIPHER_CHACHA20, /**< ChaCha20 stream cipher. */
\r
178 MBEDTLS_CIPHER_CHACHA20_POLY1305, /**< ChaCha20-Poly1305 AEAD cipher. */
\r
179 MBEDTLS_CIPHER_AES_128_KW, /**< AES cipher with 128-bit NIST KW mode. */
\r
180 MBEDTLS_CIPHER_AES_192_KW, /**< AES cipher with 192-bit NIST KW mode. */
\r
181 MBEDTLS_CIPHER_AES_256_KW, /**< AES cipher with 256-bit NIST KW mode. */
\r
182 MBEDTLS_CIPHER_AES_128_KWP, /**< AES cipher with 128-bit NIST KWP mode. */
\r
183 MBEDTLS_CIPHER_AES_192_KWP, /**< AES cipher with 192-bit NIST KWP mode. */
\r
184 MBEDTLS_CIPHER_AES_256_KWP, /**< AES cipher with 256-bit NIST KWP mode. */
\r
185 } mbedtls_cipher_type_t;
\r
187 /** Supported cipher modes. */
\r
189 MBEDTLS_MODE_NONE = 0, /**< None. */
\r
190 MBEDTLS_MODE_ECB, /**< The ECB cipher mode. */
\r
191 MBEDTLS_MODE_CBC, /**< The CBC cipher mode. */
\r
192 MBEDTLS_MODE_CFB, /**< The CFB cipher mode. */
\r
193 MBEDTLS_MODE_OFB, /**< The OFB cipher mode. */
\r
194 MBEDTLS_MODE_CTR, /**< The CTR cipher mode. */
\r
195 MBEDTLS_MODE_GCM, /**< The GCM cipher mode. */
\r
196 MBEDTLS_MODE_STREAM, /**< The stream cipher mode. */
\r
197 MBEDTLS_MODE_CCM, /**< The CCM cipher mode. */
\r
198 MBEDTLS_MODE_XTS, /**< The XTS cipher mode. */
\r
199 MBEDTLS_MODE_CHACHAPOLY, /**< The ChaCha-Poly cipher mode. */
\r
200 MBEDTLS_MODE_KW, /**< The SP800-38F KW mode */
\r
201 MBEDTLS_MODE_KWP, /**< The SP800-38F KWP mode */
\r
202 } mbedtls_cipher_mode_t;
\r
204 /** Supported cipher padding types. */
\r
206 MBEDTLS_PADDING_PKCS7 = 0, /**< PKCS7 padding (default). */
\r
207 MBEDTLS_PADDING_ONE_AND_ZEROS, /**< ISO/IEC 7816-4 padding. */
\r
208 MBEDTLS_PADDING_ZEROS_AND_LEN, /**< ANSI X.923 padding. */
\r
209 MBEDTLS_PADDING_ZEROS, /**< Zero padding (not reversible). */
\r
210 MBEDTLS_PADDING_NONE, /**< Never pad (full blocks only). */
\r
211 } mbedtls_cipher_padding_t;
\r
213 /** Type of operation. */
\r
215 MBEDTLS_OPERATION_NONE = -1,
\r
216 MBEDTLS_DECRYPT = 0,
\r
218 } mbedtls_operation_t;
\r
221 /** Undefined key length. */
\r
222 MBEDTLS_KEY_LENGTH_NONE = 0,
\r
223 /** Key length, in bits (including parity), for DES keys. */
\r
224 MBEDTLS_KEY_LENGTH_DES = 64,
\r
225 /** Key length in bits, including parity, for DES in two-key EDE. */
\r
226 MBEDTLS_KEY_LENGTH_DES_EDE = 128,
\r
227 /** Key length in bits, including parity, for DES in three-key EDE. */
\r
228 MBEDTLS_KEY_LENGTH_DES_EDE3 = 192,
\r
231 /** Maximum length of any IV, in Bytes. */
\r
232 #define MBEDTLS_MAX_IV_LENGTH 16
\r
233 /** Maximum block size of any cipher, in Bytes. */
\r
234 #define MBEDTLS_MAX_BLOCK_LENGTH 16
\r
237 * Base cipher information (opaque struct).
\r
239 typedef struct mbedtls_cipher_base_t mbedtls_cipher_base_t;
\r
242 * CMAC context (opaque struct).
\r
244 typedef struct mbedtls_cmac_context_t mbedtls_cmac_context_t;
\r
247 * Cipher information. Allows calling cipher functions
\r
248 * in a generic way.
\r
250 typedef struct mbedtls_cipher_info_t
\r
252 /** Full cipher identifier. For example,
\r
253 * MBEDTLS_CIPHER_AES_256_CBC.
\r
255 mbedtls_cipher_type_t type;
\r
257 /** The cipher mode. For example, MBEDTLS_MODE_CBC. */
\r
258 mbedtls_cipher_mode_t mode;
\r
260 /** The cipher key length, in bits. This is the
\r
261 * default length for variable sized ciphers.
\r
262 * Includes parity bits for ciphers like DES.
\r
264 unsigned int key_bitlen;
\r
266 /** Name of the cipher. */
\r
269 /** IV or nonce size, in Bytes.
\r
270 * For ciphers that accept variable IV sizes,
\r
271 * this is the recommended size.
\r
273 unsigned int iv_size;
\r
275 /** Bitflag comprised of MBEDTLS_CIPHER_VARIABLE_IV_LEN and
\r
276 * MBEDTLS_CIPHER_VARIABLE_KEY_LEN indicating whether the
\r
277 * cipher supports variable IV or variable key sizes, respectively.
\r
281 /** The block size, in Bytes. */
\r
282 unsigned int block_size;
\r
284 /** Struct for base cipher information and functions. */
\r
285 const mbedtls_cipher_base_t *base;
\r
287 } mbedtls_cipher_info_t;
\r
290 * Generic cipher context.
\r
292 typedef struct mbedtls_cipher_context_t
\r
294 /** Information about the associated cipher. */
\r
295 const mbedtls_cipher_info_t *cipher_info;
\r
297 /** Key length to use. */
\r
300 /** Operation that the key of the context has been
\r
303 mbedtls_operation_t operation;
\r
305 #if defined(MBEDTLS_CIPHER_MODE_WITH_PADDING)
\r
306 /** Padding functions to use, if relevant for
\r
307 * the specific cipher mode.
\r
309 void (*add_padding)( unsigned char *output, size_t olen, size_t data_len );
\r
310 int (*get_padding)( unsigned char *input, size_t ilen, size_t *data_len );
\r
313 /** Buffer for input that has not been processed yet. */
\r
314 unsigned char unprocessed_data[MBEDTLS_MAX_BLOCK_LENGTH];
\r
316 /** Number of Bytes that have not been processed yet. */
\r
317 size_t unprocessed_len;
\r
319 /** Current IV or NONCE_COUNTER for CTR-mode, data unit (or sector) number
\r
321 unsigned char iv[MBEDTLS_MAX_IV_LENGTH];
\r
323 /** IV size in Bytes, for ciphers with variable-length IVs. */
\r
326 /** The cipher-specific context. */
\r
329 #if defined(MBEDTLS_CMAC_C)
\r
330 /** CMAC-specific context. */
\r
331 mbedtls_cmac_context_t *cmac_ctx;
\r
334 #if defined(MBEDTLS_USE_PSA_CRYPTO)
\r
335 /** Indicates whether the cipher operations should be performed
\r
336 * by Mbed TLS' own crypto library or an external implementation
\r
337 * of the PSA Crypto API.
\r
338 * This is unset if the cipher context was established through
\r
339 * mbedtls_cipher_setup(), and set if it was established through
\r
340 * mbedtls_cipher_setup_psa().
\r
342 unsigned char psa_enabled;
\r
343 #endif /* MBEDTLS_USE_PSA_CRYPTO */
\r
345 } mbedtls_cipher_context_t;
\r
348 * \brief This function retrieves the list of ciphers supported
\r
349 * by the generic cipher module.
\r
351 * For any cipher identifier in the returned list, you can
\r
352 * obtain the corresponding generic cipher information structure
\r
353 * via mbedtls_cipher_info_from_type(), which can then be used
\r
354 * to prepare a cipher context via mbedtls_cipher_setup().
\r
357 * \return A statically-allocated array of cipher identifiers
\r
358 * of type cipher_type_t. The last entry is zero.
\r
360 const int *mbedtls_cipher_list( void );
\r
363 * \brief This function retrieves the cipher-information
\r
364 * structure associated with the given cipher name.
\r
366 * \param cipher_name Name of the cipher to search for. This must not be
\r
369 * \return The cipher information structure associated with the
\r
370 * given \p cipher_name.
\r
371 * \return \c NULL if the associated cipher information is not found.
\r
373 const mbedtls_cipher_info_t *mbedtls_cipher_info_from_string( const char *cipher_name );
\r
376 * \brief This function retrieves the cipher-information
\r
377 * structure associated with the given cipher type.
\r
379 * \param cipher_type Type of the cipher to search for.
\r
381 * \return The cipher information structure associated with the
\r
382 * given \p cipher_type.
\r
383 * \return \c NULL if the associated cipher information is not found.
\r
385 const mbedtls_cipher_info_t *mbedtls_cipher_info_from_type( const mbedtls_cipher_type_t cipher_type );
\r
388 * \brief This function retrieves the cipher-information
\r
389 * structure associated with the given cipher ID,
\r
390 * key size and mode.
\r
392 * \param cipher_id The ID of the cipher to search for. For example,
\r
393 * #MBEDTLS_CIPHER_ID_AES.
\r
394 * \param key_bitlen The length of the key in bits.
\r
395 * \param mode The cipher mode. For example, #MBEDTLS_MODE_CBC.
\r
397 * \return The cipher information structure associated with the
\r
398 * given \p cipher_id.
\r
399 * \return \c NULL if the associated cipher information is not found.
\r
401 const mbedtls_cipher_info_t *mbedtls_cipher_info_from_values( const mbedtls_cipher_id_t cipher_id,
\r
403 const mbedtls_cipher_mode_t mode );
\r
406 * \brief This function initializes a \p cipher_context as NONE.
\r
408 * \param ctx The context to be initialized. This must not be \c NULL.
\r
410 void mbedtls_cipher_init( mbedtls_cipher_context_t *ctx );
\r
413 * \brief This function frees and clears the cipher-specific
\r
414 * context of \p ctx. Freeing \p ctx itself remains the
\r
415 * responsibility of the caller.
\r
417 * \param ctx The context to be freed. If this is \c NULL, the
\r
418 * function has no effect, otherwise this must point to an
\r
419 * initialized context.
\r
421 void mbedtls_cipher_free( mbedtls_cipher_context_t *ctx );
\r
425 * \brief This function initializes a cipher context for
\r
426 * use with the given cipher primitive.
\r
428 * \param ctx The context to initialize. This must be initialized.
\r
429 * \param cipher_info The cipher to use.
\r
431 * \return \c 0 on success.
\r
432 * \return #MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA on
\r
433 * parameter-verification failure.
\r
434 * \return #MBEDTLS_ERR_CIPHER_ALLOC_FAILED if allocation of the
\r
435 * cipher-specific context fails.
\r
437 * \internal Currently, the function also clears the structure.
\r
438 * In future versions, the caller will be required to call
\r
439 * mbedtls_cipher_init() on the structure first.
\r
441 int mbedtls_cipher_setup( mbedtls_cipher_context_t *ctx,
\r
442 const mbedtls_cipher_info_t *cipher_info );
\r
444 #if defined(MBEDTLS_USE_PSA_CRYPTO)
\r
446 * \brief This function initializes a cipher context for
\r
447 * PSA-based use with the given cipher primitive.
\r
449 * \note See #MBEDTLS_USE_PSA_CRYPTO for information on PSA.
\r
451 * \param ctx The context to initialize. May not be \c NULL.
\r
452 * \param cipher_info The cipher to use.
\r
453 * \param taglen For AEAD ciphers, the length in bytes of the
\r
454 * authentication tag to use. Subsequent uses of
\r
455 * mbedtls_cipher_auth_encrypt() or
\r
456 * mbedtls_cipher_auth_decrypt() must provide
\r
457 * the same tag length.
\r
458 * For non-AEAD ciphers, the value must be \c 0.
\r
460 * \return \c 0 on success.
\r
461 * \return #MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA on
\r
462 * parameter-verification failure.
\r
463 * \return #MBEDTLS_ERR_CIPHER_ALLOC_FAILED if allocation of the
\r
464 * cipher-specific context fails.
\r
466 int mbedtls_cipher_setup_psa( mbedtls_cipher_context_t *ctx,
\r
467 const mbedtls_cipher_info_t *cipher_info,
\r
469 #endif /* MBEDTLS_USE_PSA_CRYPTO */
\r
472 * \brief This function returns the block size of the given cipher.
\r
474 * \param ctx The context of the cipher. This must be initialized.
\r
476 * \return The block size of the underlying cipher.
\r
477 * \return \c 0 if \p ctx has not been initialized.
\r
479 static inline unsigned int mbedtls_cipher_get_block_size(
\r
480 const mbedtls_cipher_context_t *ctx )
\r
482 MBEDTLS_INTERNAL_VALIDATE_RET( ctx != NULL, 0 );
\r
483 if( ctx->cipher_info == NULL )
\r
486 return ctx->cipher_info->block_size;
\r
490 * \brief This function returns the mode of operation for
\r
491 * the cipher. For example, MBEDTLS_MODE_CBC.
\r
493 * \param ctx The context of the cipher. This must be initialized.
\r
495 * \return The mode of operation.
\r
496 * \return #MBEDTLS_MODE_NONE if \p ctx has not been initialized.
\r
498 static inline mbedtls_cipher_mode_t mbedtls_cipher_get_cipher_mode(
\r
499 const mbedtls_cipher_context_t *ctx )
\r
501 MBEDTLS_INTERNAL_VALIDATE_RET( ctx != NULL, MBEDTLS_MODE_NONE );
\r
502 if( ctx->cipher_info == NULL )
\r
503 return MBEDTLS_MODE_NONE;
\r
505 return ctx->cipher_info->mode;
\r
509 * \brief This function returns the size of the IV or nonce
\r
510 * of the cipher, in Bytes.
\r
512 * \param ctx The context of the cipher. This must be initialized.
\r
514 * \return The recommended IV size if no IV has been set.
\r
515 * \return \c 0 for ciphers not using an IV or a nonce.
\r
516 * \return The actual size if an IV has been set.
\r
518 static inline int mbedtls_cipher_get_iv_size(
\r
519 const mbedtls_cipher_context_t *ctx )
\r
521 MBEDTLS_INTERNAL_VALIDATE_RET( ctx != NULL, 0 );
\r
522 if( ctx->cipher_info == NULL )
\r
525 if( ctx->iv_size != 0 )
\r
526 return (int) ctx->iv_size;
\r
528 return (int) ctx->cipher_info->iv_size;
\r
532 * \brief This function returns the type of the given cipher.
\r
534 * \param ctx The context of the cipher. This must be initialized.
\r
536 * \return The type of the cipher.
\r
537 * \return #MBEDTLS_CIPHER_NONE if \p ctx has not been initialized.
\r
539 static inline mbedtls_cipher_type_t mbedtls_cipher_get_type(
\r
540 const mbedtls_cipher_context_t *ctx )
\r
542 MBEDTLS_INTERNAL_VALIDATE_RET(
\r
543 ctx != NULL, MBEDTLS_CIPHER_NONE );
\r
544 if( ctx->cipher_info == NULL )
\r
545 return MBEDTLS_CIPHER_NONE;
\r
547 return ctx->cipher_info->type;
\r
551 * \brief This function returns the name of the given cipher
\r
554 * \param ctx The context of the cipher. This must be initialized.
\r
556 * \return The name of the cipher.
\r
557 * \return NULL if \p ctx has not been not initialized.
\r
559 static inline const char *mbedtls_cipher_get_name(
\r
560 const mbedtls_cipher_context_t *ctx )
\r
562 MBEDTLS_INTERNAL_VALIDATE_RET( ctx != NULL, 0 );
\r
563 if( ctx->cipher_info == NULL )
\r
566 return ctx->cipher_info->name;
\r
570 * \brief This function returns the key length of the cipher.
\r
572 * \param ctx The context of the cipher. This must be initialized.
\r
574 * \return The key length of the cipher in bits.
\r
575 * \return #MBEDTLS_KEY_LENGTH_NONE if ctx \p has not been
\r
578 static inline int mbedtls_cipher_get_key_bitlen(
\r
579 const mbedtls_cipher_context_t *ctx )
\r
581 MBEDTLS_INTERNAL_VALIDATE_RET(
\r
582 ctx != NULL, MBEDTLS_KEY_LENGTH_NONE );
\r
583 if( ctx->cipher_info == NULL )
\r
584 return MBEDTLS_KEY_LENGTH_NONE;
\r
586 return (int) ctx->cipher_info->key_bitlen;
\r
590 * \brief This function returns the operation of the given cipher.
\r
592 * \param ctx The context of the cipher. This must be initialized.
\r
594 * \return The type of operation: #MBEDTLS_ENCRYPT or #MBEDTLS_DECRYPT.
\r
595 * \return #MBEDTLS_OPERATION_NONE if \p ctx has not been initialized.
\r
597 static inline mbedtls_operation_t mbedtls_cipher_get_operation(
\r
598 const mbedtls_cipher_context_t *ctx )
\r
600 MBEDTLS_INTERNAL_VALIDATE_RET(
\r
601 ctx != NULL, MBEDTLS_OPERATION_NONE );
\r
602 if( ctx->cipher_info == NULL )
\r
603 return MBEDTLS_OPERATION_NONE;
\r
605 return ctx->operation;
\r
609 * \brief This function sets the key to use with the given context.
\r
611 * \param ctx The generic cipher context. This must be initialized and
\r
612 * bound to a cipher information structure.
\r
613 * \param key The key to use. This must be a readable buffer of at
\r
614 * least \p key_bitlen Bits.
\r
615 * \param key_bitlen The key length to use, in Bits.
\r
616 * \param operation The operation that the key will be used for:
\r
617 * #MBEDTLS_ENCRYPT or #MBEDTLS_DECRYPT.
\r
619 * \return \c 0 on success.
\r
620 * \return #MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA on
\r
621 * parameter-verification failure.
\r
622 * \return A cipher-specific error code on failure.
\r
624 int mbedtls_cipher_setkey( mbedtls_cipher_context_t *ctx,
\r
625 const unsigned char *key,
\r
627 const mbedtls_operation_t operation );
\r
629 #if defined(MBEDTLS_CIPHER_MODE_WITH_PADDING)
\r
631 * \brief This function sets the padding mode, for cipher modes
\r
632 * that use padding.
\r
634 * The default passing mode is PKCS7 padding.
\r
636 * \param ctx The generic cipher context. This must be initialized and
\r
637 * bound to a cipher information structure.
\r
638 * \param mode The padding mode.
\r
640 * \return \c 0 on success.
\r
641 * \return #MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE
\r
642 * if the selected padding mode is not supported.
\r
643 * \return #MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA if the cipher mode
\r
644 * does not support padding.
\r
646 int mbedtls_cipher_set_padding_mode( mbedtls_cipher_context_t *ctx,
\r
647 mbedtls_cipher_padding_t mode );
\r
648 #endif /* MBEDTLS_CIPHER_MODE_WITH_PADDING */
\r
651 * \brief This function sets the initialization vector (IV)
\r
654 * \note Some ciphers do not use IVs nor nonce. For these
\r
655 * ciphers, this function has no effect.
\r
657 * \param ctx The generic cipher context. This must be initialized and
\r
658 * bound to a cipher information structure.
\r
659 * \param iv The IV to use, or NONCE_COUNTER for CTR-mode ciphers. This
\r
660 * must be a readable buffer of at least \p iv_len Bytes.
\r
661 * \param iv_len The IV length for ciphers with variable-size IV.
\r
662 * This parameter is discarded by ciphers with fixed-size IV.
\r
664 * \return \c 0 on success.
\r
665 * \return #MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA on
\r
666 * parameter-verification failure.
\r
668 int mbedtls_cipher_set_iv( mbedtls_cipher_context_t *ctx,
\r
669 const unsigned char *iv,
\r
673 * \brief This function resets the cipher state.
\r
675 * \param ctx The generic cipher context. This must be initialized.
\r
677 * \return \c 0 on success.
\r
678 * \return #MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA on
\r
679 * parameter-verification failure.
\r
681 int mbedtls_cipher_reset( mbedtls_cipher_context_t *ctx );
\r
683 #if defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CHACHAPOLY_C)
\r
685 * \brief This function adds additional data for AEAD ciphers.
\r
686 * Currently supported with GCM and ChaCha20+Poly1305.
\r
687 * This must be called exactly once, after
\r
688 * mbedtls_cipher_reset().
\r
690 * \param ctx The generic cipher context. This must be initialized.
\r
691 * \param ad The additional data to use. This must be a readable
\r
692 * buffer of at least \p ad_len Bytes.
\r
693 * \param ad_len The length of \p ad in Bytes.
\r
695 * \return \c 0 on success.
\r
696 * \return A specific error code on failure.
\r
698 int mbedtls_cipher_update_ad( mbedtls_cipher_context_t *ctx,
\r
699 const unsigned char *ad, size_t ad_len );
\r
700 #endif /* MBEDTLS_GCM_C || MBEDTLS_CHACHAPOLY_C */
\r
703 * \brief The generic cipher update function. It encrypts or
\r
704 * decrypts using the given cipher context. Writes as
\r
705 * many block-sized blocks of data as possible to output.
\r
706 * Any data that cannot be written immediately is either
\r
707 * added to the next block, or flushed when
\r
708 * mbedtls_cipher_finish() is called.
\r
709 * Exception: For MBEDTLS_MODE_ECB, expects a single block
\r
710 * in size. For example, 16 Bytes for AES.
\r
712 * \note If the underlying cipher is used in GCM mode, all calls
\r
713 * to this function, except for the last one before
\r
714 * mbedtls_cipher_finish(), must have \p ilen as a
\r
715 * multiple of the block size of the cipher.
\r
717 * \param ctx The generic cipher context. This must be initialized and
\r
719 * \param input The buffer holding the input data. This must be a
\r
720 * readable buffer of at least \p ilen Bytes.
\r
721 * \param ilen The length of the input data.
\r
722 * \param output The buffer for the output data. This must be able to
\r
723 * hold at least `ilen + block_size`. This must not be the
\r
724 * same buffer as \p input.
\r
725 * \param olen The length of the output data, to be updated with the
\r
726 * actual number of Bytes written. This must not be
\r
729 * \return \c 0 on success.
\r
730 * \return #MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA on
\r
731 * parameter-verification failure.
\r
732 * \return #MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE on an
\r
733 * unsupported mode for a cipher.
\r
734 * \return A cipher-specific error code on failure.
\r
736 int mbedtls_cipher_update( mbedtls_cipher_context_t *ctx,
\r
737 const unsigned char *input,
\r
738 size_t ilen, unsigned char *output,
\r
742 * \brief The generic cipher finalization function. If data still
\r
743 * needs to be flushed from an incomplete block, the data
\r
744 * contained in it is padded to the size of
\r
745 * the last block, and written to the \p output buffer.
\r
747 * \param ctx The generic cipher context. This must be initialized and
\r
749 * \param output The buffer to write data to. This needs to be a writable
\r
750 * buffer of at least \p block_size Bytes.
\r
751 * \param olen The length of the data written to the \p output buffer.
\r
752 * This may not be \c NULL.
\r
754 * \return \c 0 on success.
\r
755 * \return #MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA on
\r
756 * parameter-verification failure.
\r
757 * \return #MBEDTLS_ERR_CIPHER_FULL_BLOCK_EXPECTED on decryption
\r
758 * expecting a full block but not receiving one.
\r
759 * \return #MBEDTLS_ERR_CIPHER_INVALID_PADDING on invalid padding
\r
760 * while decrypting.
\r
761 * \return A cipher-specific error code on failure.
\r
763 int mbedtls_cipher_finish( mbedtls_cipher_context_t *ctx,
\r
764 unsigned char *output, size_t *olen );
\r
766 #if defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CHACHAPOLY_C)
\r
768 * \brief This function writes a tag for AEAD ciphers.
\r
769 * Currently supported with GCM and ChaCha20+Poly1305.
\r
770 * This must be called after mbedtls_cipher_finish().
\r
772 * \param ctx The generic cipher context. This must be initialized,
\r
773 * bound to a key, and have just completed a cipher
\r
774 * operation through mbedtls_cipher_finish() the tag for
\r
775 * which should be written.
\r
776 * \param tag The buffer to write the tag to. This must be a writable
\r
777 * buffer of at least \p tag_len Bytes.
\r
778 * \param tag_len The length of the tag to write.
\r
780 * \return \c 0 on success.
\r
781 * \return A specific error code on failure.
\r
783 int mbedtls_cipher_write_tag( mbedtls_cipher_context_t *ctx,
\r
784 unsigned char *tag, size_t tag_len );
\r
787 * \brief This function checks the tag for AEAD ciphers.
\r
788 * Currently supported with GCM and ChaCha20+Poly1305.
\r
789 * This must be called after mbedtls_cipher_finish().
\r
791 * \param ctx The generic cipher context. This must be initialized.
\r
792 * \param tag The buffer holding the tag. This must be a readable
\r
793 * buffer of at least \p tag_len Bytes.
\r
794 * \param tag_len The length of the tag to check.
\r
796 * \return \c 0 on success.
\r
797 * \return A specific error code on failure.
\r
799 int mbedtls_cipher_check_tag( mbedtls_cipher_context_t *ctx,
\r
800 const unsigned char *tag, size_t tag_len );
\r
801 #endif /* MBEDTLS_GCM_C || MBEDTLS_CHACHAPOLY_C */
\r
804 * \brief The generic all-in-one encryption/decryption function,
\r
805 * for all ciphers except AEAD constructs.
\r
807 * \param ctx The generic cipher context. This must be initialized.
\r
808 * \param iv The IV to use, or NONCE_COUNTER for CTR-mode ciphers.
\r
809 * This must be a readable buffer of at least \p iv_len
\r
811 * \param iv_len The IV length for ciphers with variable-size IV.
\r
812 * This parameter is discarded by ciphers with fixed-size
\r
814 * \param input The buffer holding the input data. This must be a
\r
815 * readable buffer of at least \p ilen Bytes.
\r
816 * \param ilen The length of the input data in Bytes.
\r
817 * \param output The buffer for the output data. This must be able to
\r
818 * hold at least `ilen + block_size`. This must not be the
\r
819 * same buffer as \p input.
\r
820 * \param olen The length of the output data, to be updated with the
\r
821 * actual number of Bytes written. This must not be
\r
824 * \note Some ciphers do not use IVs nor nonce. For these
\r
825 * ciphers, use \p iv = NULL and \p iv_len = 0.
\r
827 * \return \c 0 on success.
\r
828 * \return #MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA on
\r
829 * parameter-verification failure.
\r
830 * \return #MBEDTLS_ERR_CIPHER_FULL_BLOCK_EXPECTED on decryption
\r
831 * expecting a full block but not receiving one.
\r
832 * \return #MBEDTLS_ERR_CIPHER_INVALID_PADDING on invalid padding
\r
833 * while decrypting.
\r
834 * \return A cipher-specific error code on failure.
\r
836 int mbedtls_cipher_crypt( mbedtls_cipher_context_t *ctx,
\r
837 const unsigned char *iv, size_t iv_len,
\r
838 const unsigned char *input, size_t ilen,
\r
839 unsigned char *output, size_t *olen );
\r
841 #if defined(MBEDTLS_CIPHER_MODE_AEAD)
\r
843 * \brief The generic autenticated encryption (AEAD) function.
\r
845 * \param ctx The generic cipher context. This must be initialized and
\r
847 * \param iv The IV to use, or NONCE_COUNTER for CTR-mode ciphers.
\r
848 * This must be a readable buffer of at least \p iv_len
\r
850 * \param iv_len The IV length for ciphers with variable-size IV.
\r
851 * This parameter is discarded by ciphers with fixed-size IV.
\r
852 * \param ad The additional data to authenticate. This must be a
\r
853 * readable buffer of at least \p ad_len Bytes.
\r
854 * \param ad_len The length of \p ad.
\r
855 * \param input The buffer holding the input data. This must be a
\r
856 * readable buffer of at least \p ilen Bytes.
\r
857 * \param ilen The length of the input data.
\r
858 * \param output The buffer for the output data. This must be able to
\r
859 * hold at least \p ilen Bytes.
\r
860 * \param olen The length of the output data, to be updated with the
\r
861 * actual number of Bytes written. This must not be
\r
863 * \param tag The buffer for the authentication tag. This must be a
\r
864 * writable buffer of at least \p tag_len Bytes.
\r
865 * \param tag_len The desired length of the authentication tag.
\r
867 * \return \c 0 on success.
\r
868 * \return #MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA on
\r
869 * parameter-verification failure.
\r
870 * \return A cipher-specific error code on failure.
\r
872 int mbedtls_cipher_auth_encrypt( mbedtls_cipher_context_t *ctx,
\r
873 const unsigned char *iv, size_t iv_len,
\r
874 const unsigned char *ad, size_t ad_len,
\r
875 const unsigned char *input, size_t ilen,
\r
876 unsigned char *output, size_t *olen,
\r
877 unsigned char *tag, size_t tag_len );
\r
880 * \brief The generic autenticated decryption (AEAD) function.
\r
882 * \note If the data is not authentic, then the output buffer
\r
883 * is zeroed out to prevent the unauthentic plaintext being
\r
884 * used, making this interface safer.
\r
886 * \param ctx The generic cipher context. This must be initialized and
\r
887 * and bound to a key.
\r
888 * \param iv The IV to use, or NONCE_COUNTER for CTR-mode ciphers.
\r
889 * This must be a readable buffer of at least \p iv_len
\r
891 * \param iv_len The IV length for ciphers with variable-size IV.
\r
892 * This parameter is discarded by ciphers with fixed-size IV.
\r
893 * \param ad The additional data to be authenticated. This must be a
\r
894 * readable buffer of at least \p ad_len Bytes.
\r
895 * \param ad_len The length of \p ad.
\r
896 * \param input The buffer holding the input data. This must be a
\r
897 * readable buffer of at least \p ilen Bytes.
\r
898 * \param ilen The length of the input data.
\r
899 * \param output The buffer for the output data.
\r
900 * This must be able to hold at least \p ilen Bytes.
\r
901 * \param olen The length of the output data, to be updated with the
\r
902 * actual number of Bytes written. This must not be
\r
904 * \param tag The buffer holding the authentication tag. This must be
\r
905 * a readable buffer of at least \p tag_len Bytes.
\r
906 * \param tag_len The length of the authentication tag.
\r
908 * \return \c 0 on success.
\r
909 * \return #MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA on
\r
910 * parameter-verification failure.
\r
911 * \return #MBEDTLS_ERR_CIPHER_AUTH_FAILED if data is not authentic.
\r
912 * \return A cipher-specific error code on failure.
\r
914 int mbedtls_cipher_auth_decrypt( mbedtls_cipher_context_t *ctx,
\r
915 const unsigned char *iv, size_t iv_len,
\r
916 const unsigned char *ad, size_t ad_len,
\r
917 const unsigned char *input, size_t ilen,
\r
918 unsigned char *output, size_t *olen,
\r
919 const unsigned char *tag, size_t tag_len );
\r
920 #endif /* MBEDTLS_CIPHER_MODE_AEAD */
\r
926 #endif /* MBEDTLS_CIPHER_H */
\r