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