| /** |
| * \file cipher.h |
| * |
| * \brief This file contains an abstraction interface for use with the cipher |
| * primitives provided by the library. It provides a common interface to all of |
| * the available cipher operations. |
| * |
| * \author Adriaan de Jong <dejong@fox-it.com> |
| */ |
| /* |
| * Copyright The Mbed TLS Contributors |
| * SPDX-License-Identifier: Apache-2.0 |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); you may |
| * not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef MBEDTLS_CIPHER_H |
| #define MBEDTLS_CIPHER_H |
| #include "mbedtls/private_access.h" |
| |
| #include "mbedtls/build_info.h" |
| |
| #include <stddef.h> |
| #include "mbedtls/platform_util.h" |
| |
| #if defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CCM_C) || defined(MBEDTLS_CHACHAPOLY_C) |
| #define MBEDTLS_CIPHER_MODE_AEAD |
| #endif |
| |
| #if defined(MBEDTLS_CIPHER_MODE_CBC) |
| #define MBEDTLS_CIPHER_MODE_WITH_PADDING |
| #endif |
| |
| #if defined(MBEDTLS_CIPHER_NULL_CIPHER) || \ |
| defined(MBEDTLS_CHACHA20_C) |
| #define MBEDTLS_CIPHER_MODE_STREAM |
| #endif |
| |
| #if ( defined(__ARMCC_VERSION) || defined(_MSC_VER) ) && \ |
| !defined(inline) && !defined(__cplusplus) |
| #define inline __inline |
| #endif |
| |
| #define MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE -0x6080 /**< The selected feature is not available. */ |
| #define MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA -0x6100 /**< Bad input parameters. */ |
| #define MBEDTLS_ERR_CIPHER_ALLOC_FAILED -0x6180 /**< Failed to allocate memory. */ |
| #define MBEDTLS_ERR_CIPHER_INVALID_PADDING -0x6200 /**< Input data contains invalid padding and is rejected. */ |
| #define MBEDTLS_ERR_CIPHER_FULL_BLOCK_EXPECTED -0x6280 /**< Decryption of block requires a full block. */ |
| #define MBEDTLS_ERR_CIPHER_AUTH_FAILED -0x6300 /**< Authentication failed (for AEAD modes). */ |
| #define MBEDTLS_ERR_CIPHER_INVALID_CONTEXT -0x6380 /**< The context is invalid. For example, because it was freed. */ |
| |
| #define MBEDTLS_CIPHER_VARIABLE_IV_LEN 0x01 /**< Cipher accepts IVs of variable length. */ |
| #define MBEDTLS_CIPHER_VARIABLE_KEY_LEN 0x02 /**< Cipher accepts keys of variable length. */ |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| /** |
| * \brief Supported cipher types. |
| * |
| * \warning DES is considered weak cipher and its use |
| * constitutes a security risk. Arm recommends considering stronger |
| * ciphers instead. |
| */ |
| typedef enum { |
| MBEDTLS_CIPHER_ID_NONE = 0, /**< Placeholder to mark the end of cipher ID lists. */ |
| MBEDTLS_CIPHER_ID_NULL, /**< The identity cipher, treated as a stream cipher. */ |
| MBEDTLS_CIPHER_ID_AES, /**< The AES cipher. */ |
| MBEDTLS_CIPHER_ID_DES, /**< The DES cipher. */ |
| MBEDTLS_CIPHER_ID_3DES, /**< The Triple DES cipher. */ |
| MBEDTLS_CIPHER_ID_CAMELLIA, /**< The Camellia cipher. */ |
| MBEDTLS_CIPHER_ID_ARIA, /**< The Aria cipher. */ |
| MBEDTLS_CIPHER_ID_CHACHA20, /**< The ChaCha20 cipher. */ |
| } mbedtls_cipher_id_t; |
| |
| /** |
| * \brief Supported {cipher type, cipher mode} pairs. |
| * |
| * \warning DES is considered weak cipher and its use |
| * constitutes a security risk. Arm recommends considering stronger |
| * ciphers instead. |
| */ |
| typedef enum { |
| MBEDTLS_CIPHER_NONE = 0, /**< Placeholder to mark the end of cipher-pair lists. */ |
| MBEDTLS_CIPHER_NULL, /**< The identity stream cipher. */ |
| MBEDTLS_CIPHER_AES_128_ECB, /**< AES cipher with 128-bit ECB mode. */ |
| MBEDTLS_CIPHER_AES_192_ECB, /**< AES cipher with 192-bit ECB mode. */ |
| MBEDTLS_CIPHER_AES_256_ECB, /**< AES cipher with 256-bit ECB mode. */ |
| MBEDTLS_CIPHER_AES_128_CBC, /**< AES cipher with 128-bit CBC mode. */ |
| MBEDTLS_CIPHER_AES_192_CBC, /**< AES cipher with 192-bit CBC mode. */ |
| MBEDTLS_CIPHER_AES_256_CBC, /**< AES cipher with 256-bit CBC mode. */ |
| MBEDTLS_CIPHER_AES_128_CFB128, /**< AES cipher with 128-bit CFB128 mode. */ |
| MBEDTLS_CIPHER_AES_192_CFB128, /**< AES cipher with 192-bit CFB128 mode. */ |
| MBEDTLS_CIPHER_AES_256_CFB128, /**< AES cipher with 256-bit CFB128 mode. */ |
| MBEDTLS_CIPHER_AES_128_CTR, /**< AES cipher with 128-bit CTR mode. */ |
| MBEDTLS_CIPHER_AES_192_CTR, /**< AES cipher with 192-bit CTR mode. */ |
| MBEDTLS_CIPHER_AES_256_CTR, /**< AES cipher with 256-bit CTR mode. */ |
| MBEDTLS_CIPHER_AES_128_GCM, /**< AES cipher with 128-bit GCM mode. */ |
| MBEDTLS_CIPHER_AES_192_GCM, /**< AES cipher with 192-bit GCM mode. */ |
| MBEDTLS_CIPHER_AES_256_GCM, /**< AES cipher with 256-bit GCM mode. */ |
| MBEDTLS_CIPHER_CAMELLIA_128_ECB, /**< Camellia cipher with 128-bit ECB mode. */ |
| MBEDTLS_CIPHER_CAMELLIA_192_ECB, /**< Camellia cipher with 192-bit ECB mode. */ |
| MBEDTLS_CIPHER_CAMELLIA_256_ECB, /**< Camellia cipher with 256-bit ECB mode. */ |
| MBEDTLS_CIPHER_CAMELLIA_128_CBC, /**< Camellia cipher with 128-bit CBC mode. */ |
| MBEDTLS_CIPHER_CAMELLIA_192_CBC, /**< Camellia cipher with 192-bit CBC mode. */ |
| MBEDTLS_CIPHER_CAMELLIA_256_CBC, /**< Camellia cipher with 256-bit CBC mode. */ |
| MBEDTLS_CIPHER_CAMELLIA_128_CFB128, /**< Camellia cipher with 128-bit CFB128 mode. */ |
| MBEDTLS_CIPHER_CAMELLIA_192_CFB128, /**< Camellia cipher with 192-bit CFB128 mode. */ |
| MBEDTLS_CIPHER_CAMELLIA_256_CFB128, /**< Camellia cipher with 256-bit CFB128 mode. */ |
| MBEDTLS_CIPHER_CAMELLIA_128_CTR, /**< Camellia cipher with 128-bit CTR mode. */ |
| MBEDTLS_CIPHER_CAMELLIA_192_CTR, /**< Camellia cipher with 192-bit CTR mode. */ |
| MBEDTLS_CIPHER_CAMELLIA_256_CTR, /**< Camellia cipher with 256-bit CTR mode. */ |
| MBEDTLS_CIPHER_CAMELLIA_128_GCM, /**< Camellia cipher with 128-bit GCM mode. */ |
| MBEDTLS_CIPHER_CAMELLIA_192_GCM, /**< Camellia cipher with 192-bit GCM mode. */ |
| MBEDTLS_CIPHER_CAMELLIA_256_GCM, /**< Camellia cipher with 256-bit GCM mode. */ |
| MBEDTLS_CIPHER_DES_ECB, /**< DES cipher with ECB mode. */ |
| MBEDTLS_CIPHER_DES_CBC, /**< DES cipher with CBC mode. */ |
| MBEDTLS_CIPHER_DES_EDE_ECB, /**< DES cipher with EDE ECB mode. */ |
| MBEDTLS_CIPHER_DES_EDE_CBC, /**< DES cipher with EDE CBC mode. */ |
| MBEDTLS_CIPHER_DES_EDE3_ECB, /**< DES cipher with EDE3 ECB mode. */ |
| MBEDTLS_CIPHER_DES_EDE3_CBC, /**< DES cipher with EDE3 CBC mode. */ |
| MBEDTLS_CIPHER_AES_128_CCM, /**< AES cipher with 128-bit CCM mode. */ |
| MBEDTLS_CIPHER_AES_192_CCM, /**< AES cipher with 192-bit CCM mode. */ |
| MBEDTLS_CIPHER_AES_256_CCM, /**< AES cipher with 256-bit CCM mode. */ |
| MBEDTLS_CIPHER_CAMELLIA_128_CCM, /**< Camellia cipher with 128-bit CCM mode. */ |
| MBEDTLS_CIPHER_CAMELLIA_192_CCM, /**< Camellia cipher with 192-bit CCM mode. */ |
| MBEDTLS_CIPHER_CAMELLIA_256_CCM, /**< Camellia cipher with 256-bit CCM mode. */ |
| MBEDTLS_CIPHER_ARIA_128_ECB, /**< Aria cipher with 128-bit key and ECB mode. */ |
| MBEDTLS_CIPHER_ARIA_192_ECB, /**< Aria cipher with 192-bit key and ECB mode. */ |
| MBEDTLS_CIPHER_ARIA_256_ECB, /**< Aria cipher with 256-bit key and ECB mode. */ |
| MBEDTLS_CIPHER_ARIA_128_CBC, /**< Aria cipher with 128-bit key and CBC mode. */ |
| MBEDTLS_CIPHER_ARIA_192_CBC, /**< Aria cipher with 192-bit key and CBC mode. */ |
| MBEDTLS_CIPHER_ARIA_256_CBC, /**< Aria cipher with 256-bit key and CBC mode. */ |
| MBEDTLS_CIPHER_ARIA_128_CFB128, /**< Aria cipher with 128-bit key and CFB-128 mode. */ |
| MBEDTLS_CIPHER_ARIA_192_CFB128, /**< Aria cipher with 192-bit key and CFB-128 mode. */ |
| MBEDTLS_CIPHER_ARIA_256_CFB128, /**< Aria cipher with 256-bit key and CFB-128 mode. */ |
| MBEDTLS_CIPHER_ARIA_128_CTR, /**< Aria cipher with 128-bit key and CTR mode. */ |
| MBEDTLS_CIPHER_ARIA_192_CTR, /**< Aria cipher with 192-bit key and CTR mode. */ |
| MBEDTLS_CIPHER_ARIA_256_CTR, /**< Aria cipher with 256-bit key and CTR mode. */ |
| MBEDTLS_CIPHER_ARIA_128_GCM, /**< Aria cipher with 128-bit key and GCM mode. */ |
| MBEDTLS_CIPHER_ARIA_192_GCM, /**< Aria cipher with 192-bit key and GCM mode. */ |
| MBEDTLS_CIPHER_ARIA_256_GCM, /**< Aria cipher with 256-bit key and GCM mode. */ |
| MBEDTLS_CIPHER_ARIA_128_CCM, /**< Aria cipher with 128-bit key and CCM mode. */ |
| MBEDTLS_CIPHER_ARIA_192_CCM, /**< Aria cipher with 192-bit key and CCM mode. */ |
| MBEDTLS_CIPHER_ARIA_256_CCM, /**< Aria cipher with 256-bit key and CCM mode. */ |
| MBEDTLS_CIPHER_AES_128_OFB, /**< AES 128-bit cipher in OFB mode. */ |
| MBEDTLS_CIPHER_AES_192_OFB, /**< AES 192-bit cipher in OFB mode. */ |
| MBEDTLS_CIPHER_AES_256_OFB, /**< AES 256-bit cipher in OFB mode. */ |
| MBEDTLS_CIPHER_AES_128_XTS, /**< AES 128-bit cipher in XTS block mode. */ |
| MBEDTLS_CIPHER_AES_256_XTS, /**< AES 256-bit cipher in XTS block mode. */ |
| MBEDTLS_CIPHER_CHACHA20, /**< ChaCha20 stream cipher. */ |
| MBEDTLS_CIPHER_CHACHA20_POLY1305, /**< ChaCha20-Poly1305 AEAD cipher. */ |
| MBEDTLS_CIPHER_AES_128_KW, /**< AES cipher with 128-bit NIST KW mode. */ |
| MBEDTLS_CIPHER_AES_192_KW, /**< AES cipher with 192-bit NIST KW mode. */ |
| MBEDTLS_CIPHER_AES_256_KW, /**< AES cipher with 256-bit NIST KW mode. */ |
| MBEDTLS_CIPHER_AES_128_KWP, /**< AES cipher with 128-bit NIST KWP mode. */ |
| MBEDTLS_CIPHER_AES_192_KWP, /**< AES cipher with 192-bit NIST KWP mode. */ |
| MBEDTLS_CIPHER_AES_256_KWP, /**< AES cipher with 256-bit NIST KWP mode. */ |
| } mbedtls_cipher_type_t; |
| |
| /** Supported cipher modes. */ |
| typedef enum { |
| MBEDTLS_MODE_NONE = 0, /**< None. */ |
| MBEDTLS_MODE_ECB, /**< The ECB cipher mode. */ |
| MBEDTLS_MODE_CBC, /**< The CBC cipher mode. */ |
| MBEDTLS_MODE_CFB, /**< The CFB cipher mode. */ |
| MBEDTLS_MODE_OFB, /**< The OFB cipher mode. */ |
| MBEDTLS_MODE_CTR, /**< The CTR cipher mode. */ |
| MBEDTLS_MODE_GCM, /**< The GCM cipher mode. */ |
| MBEDTLS_MODE_STREAM, /**< The stream cipher mode. */ |
| MBEDTLS_MODE_CCM, /**< The CCM cipher mode. */ |
| MBEDTLS_MODE_XTS, /**< The XTS cipher mode. */ |
| MBEDTLS_MODE_CHACHAPOLY, /**< The ChaCha-Poly cipher mode. */ |
| MBEDTLS_MODE_KW, /**< The SP800-38F KW mode */ |
| MBEDTLS_MODE_KWP, /**< The SP800-38F KWP mode */ |
| } mbedtls_cipher_mode_t; |
| |
| /** Supported cipher padding types. */ |
| typedef enum { |
| MBEDTLS_PADDING_PKCS7 = 0, /**< PKCS7 padding (default). */ |
| MBEDTLS_PADDING_ONE_AND_ZEROS, /**< ISO/IEC 7816-4 padding. */ |
| MBEDTLS_PADDING_ZEROS_AND_LEN, /**< ANSI X.923 padding. */ |
| MBEDTLS_PADDING_ZEROS, /**< Zero padding (not reversible). */ |
| MBEDTLS_PADDING_NONE, /**< Never pad (full blocks only). */ |
| } mbedtls_cipher_padding_t; |
| |
| /** Type of operation. */ |
| typedef enum { |
| MBEDTLS_OPERATION_NONE = -1, |
| MBEDTLS_DECRYPT = 0, |
| MBEDTLS_ENCRYPT, |
| } mbedtls_operation_t; |
| |
| enum { |
| /** Undefined key length. */ |
| MBEDTLS_KEY_LENGTH_NONE = 0, |
| /** Key length, in bits (including parity), for DES keys. */ |
| MBEDTLS_KEY_LENGTH_DES = 64, |
| /** Key length in bits, including parity, for DES in two-key EDE. */ |
| MBEDTLS_KEY_LENGTH_DES_EDE = 128, |
| /** Key length in bits, including parity, for DES in three-key EDE. */ |
| MBEDTLS_KEY_LENGTH_DES_EDE3 = 192, |
| }; |
| |
| /** Maximum length of any IV, in Bytes. */ |
| /* This should ideally be derived automatically from list of ciphers. |
| * This should be kept in sync with MBEDTLS_SSL_MAX_IV_LENGTH defined |
| * in library/ssl_misc.h. */ |
| #define MBEDTLS_MAX_IV_LENGTH 16 |
| |
| /** Maximum block size of any cipher, in Bytes. */ |
| /* This should ideally be derived automatically from list of ciphers. |
| * This should be kept in sync with MBEDTLS_SSL_MAX_BLOCK_LENGTH defined |
| * in library/ssl_misc.h. */ |
| #define MBEDTLS_MAX_BLOCK_LENGTH 16 |
| |
| /** Maximum key length, in Bytes. */ |
| /* This should ideally be derived automatically from list of ciphers. |
| * For now, only check whether XTS is enabled which uses 64 Byte keys, |
| * and use 32 Bytes as an upper bound for the maximum key length otherwise. |
| * This should be kept in sync with MBEDTLS_SSL_MAX_BLOCK_LENGTH defined |
| * in library/ssl_misc.h, which however deliberately ignores the case of XTS |
| * since the latter isn't used in SSL/TLS. */ |
| #if defined(MBEDTLS_CIPHER_MODE_XTS) |
| #define MBEDTLS_MAX_KEY_LENGTH 64 |
| #else |
| #define MBEDTLS_MAX_KEY_LENGTH 32 |
| #endif /* MBEDTLS_CIPHER_MODE_XTS */ |
| |
| /** |
| * Base cipher information (opaque struct). |
| */ |
| typedef struct mbedtls_cipher_base_t mbedtls_cipher_base_t; |
| |
| /** |
| * CMAC context (opaque struct). |
| */ |
| typedef struct mbedtls_cmac_context_t mbedtls_cmac_context_t; |
| |
| /** |
| * Cipher information. Allows calling cipher functions |
| * in a generic way. |
| */ |
| typedef struct mbedtls_cipher_info_t |
| { |
| /** Full cipher identifier. For example, |
| * MBEDTLS_CIPHER_AES_256_CBC. |
| */ |
| mbedtls_cipher_type_t MBEDTLS_PRIVATE(type); |
| |
| /** The cipher mode. For example, MBEDTLS_MODE_CBC. */ |
| mbedtls_cipher_mode_t MBEDTLS_PRIVATE(mode); |
| |
| /** The cipher key length, in bits. This is the |
| * default length for variable sized ciphers. |
| * Includes parity bits for ciphers like DES. |
| */ |
| unsigned int MBEDTLS_PRIVATE(key_bitlen); |
| |
| /** Name of the cipher. */ |
| const char * MBEDTLS_PRIVATE(name); |
| |
| /** IV or nonce size, in Bytes. |
| * For ciphers that accept variable IV sizes, |
| * this is the recommended size. |
| */ |
| unsigned int MBEDTLS_PRIVATE(iv_size); |
| |
| /** Bitflag comprised of MBEDTLS_CIPHER_VARIABLE_IV_LEN and |
| * MBEDTLS_CIPHER_VARIABLE_KEY_LEN indicating whether the |
| * cipher supports variable IV or variable key sizes, respectively. |
| */ |
| int MBEDTLS_PRIVATE(flags); |
| |
| /** The block size, in Bytes. */ |
| unsigned int MBEDTLS_PRIVATE(block_size); |
| |
| /** Struct for base cipher information and functions. */ |
| const mbedtls_cipher_base_t *MBEDTLS_PRIVATE(base); |
| |
| } mbedtls_cipher_info_t; |
| |
| /** |
| * Generic cipher context. |
| */ |
| typedef struct mbedtls_cipher_context_t |
| { |
| /** Information about the associated cipher. */ |
| const mbedtls_cipher_info_t *MBEDTLS_PRIVATE(cipher_info); |
| |
| /** Key length to use. */ |
| int MBEDTLS_PRIVATE(key_bitlen); |
| |
| /** Operation that the key of the context has been |
| * initialized for. |
| */ |
| mbedtls_operation_t MBEDTLS_PRIVATE(operation); |
| |
| #if defined(MBEDTLS_CIPHER_MODE_WITH_PADDING) |
| /** Padding functions to use, if relevant for |
| * the specific cipher mode. |
| */ |
| void (*MBEDTLS_PRIVATE(add_padding))( unsigned char *output, size_t olen, size_t data_len ); |
| int (*MBEDTLS_PRIVATE(get_padding))( unsigned char *input, size_t ilen, size_t *data_len ); |
| #endif |
| |
| /** Buffer for input that has not been processed yet. */ |
| unsigned char MBEDTLS_PRIVATE(unprocessed_data)[MBEDTLS_MAX_BLOCK_LENGTH]; |
| |
| /** Number of Bytes that have not been processed yet. */ |
| size_t MBEDTLS_PRIVATE(unprocessed_len); |
| |
| /** Current IV or NONCE_COUNTER for CTR-mode, data unit (or sector) number |
| * for XTS-mode. */ |
| unsigned char MBEDTLS_PRIVATE(iv)[MBEDTLS_MAX_IV_LENGTH]; |
| |
| /** IV size in Bytes, for ciphers with variable-length IVs. */ |
| size_t MBEDTLS_PRIVATE(iv_size); |
| |
| /** The cipher-specific context. */ |
| void *MBEDTLS_PRIVATE(cipher_ctx); |
| |
| #if defined(MBEDTLS_CMAC_C) |
| /** CMAC-specific context. */ |
| mbedtls_cmac_context_t *MBEDTLS_PRIVATE(cmac_ctx); |
| #endif |
| |
| #if defined(MBEDTLS_USE_PSA_CRYPTO) |
| /** Indicates whether the cipher operations should be performed |
| * by Mbed TLS' own crypto library or an external implementation |
| * of the PSA Crypto API. |
| * This is unset if the cipher context was established through |
| * mbedtls_cipher_setup(), and set if it was established through |
| * mbedtls_cipher_setup_psa(). |
| */ |
| unsigned char MBEDTLS_PRIVATE(psa_enabled); |
| #endif /* MBEDTLS_USE_PSA_CRYPTO */ |
| |
| } mbedtls_cipher_context_t; |
| |
| /** |
| * \brief This function retrieves the list of ciphers supported |
| * by the generic cipher module. |
| * |
| * For any cipher identifier in the returned list, you can |
| * obtain the corresponding generic cipher information structure |
| * via mbedtls_cipher_info_from_type(), which can then be used |
| * to prepare a cipher context via mbedtls_cipher_setup(). |
| * |
| * |
| * \return A statically-allocated array of cipher identifiers |
| * of type cipher_type_t. The last entry is zero. |
| */ |
| const int *mbedtls_cipher_list( void ); |
| |
| /** |
| * \brief This function retrieves the cipher-information |
| * structure associated with the given cipher name. |
| * |
| * \param cipher_name Name of the cipher to search for. This must not be |
| * \c NULL. |
| * |
| * \return The cipher information structure associated with the |
| * given \p cipher_name. |
| * \return \c NULL if the associated cipher information is not found. |
| */ |
| const mbedtls_cipher_info_t *mbedtls_cipher_info_from_string( const char *cipher_name ); |
| |
| /** |
| * \brief This function retrieves the cipher-information |
| * structure associated with the given cipher type. |
| * |
| * \param cipher_type Type of the cipher to search for. |
| * |
| * \return The cipher information structure associated with the |
| * given \p cipher_type. |
| * \return \c NULL if the associated cipher information is not found. |
| */ |
| const mbedtls_cipher_info_t *mbedtls_cipher_info_from_type( const mbedtls_cipher_type_t cipher_type ); |
| |
| /** |
| * \brief This function retrieves the cipher-information |
| * structure associated with the given cipher ID, |
| * key size and mode. |
| * |
| * \param cipher_id The ID of the cipher to search for. For example, |
| * #MBEDTLS_CIPHER_ID_AES. |
| * \param key_bitlen The length of the key in bits. |
| * \param mode The cipher mode. For example, #MBEDTLS_MODE_CBC. |
| * |
| * \return The cipher information structure associated with the |
| * given \p cipher_id. |
| * \return \c NULL if the associated cipher information is not found. |
| */ |
| const mbedtls_cipher_info_t *mbedtls_cipher_info_from_values( const mbedtls_cipher_id_t cipher_id, |
| int key_bitlen, |
| const mbedtls_cipher_mode_t mode ); |
| |
| /** |
| * \brief This function initializes a \p cipher_context as NONE. |
| * |
| * \param ctx The context to be initialized. This must not be \c NULL. |
| */ |
| void mbedtls_cipher_init( mbedtls_cipher_context_t *ctx ); |
| |
| /** |
| * \brief This function frees and clears the cipher-specific |
| * context of \p ctx. Freeing \p ctx itself remains the |
| * responsibility of the caller. |
| * |
| * \param ctx The context to be freed. If this is \c NULL, the |
| * function has no effect, otherwise this must point to an |
| * initialized context. |
| */ |
| void mbedtls_cipher_free( mbedtls_cipher_context_t *ctx ); |
| |
| |
| /** |
| * \brief This function prepares a cipher context for |
| * use with the given cipher primitive. |
| * |
| * \note After calling this function, you should call |
| * mbedtls_cipher_setkey() and, if the mode uses padding, |
| * mbedtls_cipher_set_padding_mode(), then for each |
| * message to encrypt or decrypt with this key, either: |
| * - mbedtls_cipher_crypt() for one-shot processing with |
| * non-AEAD modes; |
| * - mbedtls_cipher_auth_encrypt_ext() or |
| * mbedtls_cipher_auth_decrypt_ext() for one-shot |
| * processing with AEAD modes or NIST_KW; |
| * - for multi-part processing, see the documentation of |
| * mbedtls_cipher_reset(). |
| * |
| * \param ctx The context to prepare. This must be initialized by |
| * a call to mbedtls_cipher_init() first. |
| * \param cipher_info The cipher to use. |
| * |
| * \return \c 0 on success. |
| * \return #MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA on |
| * parameter-verification failure. |
| * \return #MBEDTLS_ERR_CIPHER_ALLOC_FAILED if allocation of the |
| * cipher-specific context fails. |
| */ |
| int mbedtls_cipher_setup( mbedtls_cipher_context_t *ctx, |
| const mbedtls_cipher_info_t *cipher_info ); |
| |
| #if defined(MBEDTLS_USE_PSA_CRYPTO) |
| /** |
| * \brief This function initializes a cipher context for |
| * PSA-based use with the given cipher primitive. |
| * |
| * \note See #MBEDTLS_USE_PSA_CRYPTO for information on PSA. |
| * |
| * \param ctx The context to initialize. May not be \c NULL. |
| * \param cipher_info The cipher to use. |
| * \param taglen For AEAD ciphers, the length in bytes of the |
| * authentication tag to use. Subsequent uses of |
| * mbedtls_cipher_auth_encrypt_ext() or |
| * mbedtls_cipher_auth_decrypt_ext() must provide |
| * the same tag length. |
| * For non-AEAD ciphers, the value must be \c 0. |
| * |
| * \return \c 0 on success. |
| * \return #MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA on |
| * parameter-verification failure. |
| * \return #MBEDTLS_ERR_CIPHER_ALLOC_FAILED if allocation of the |
| * cipher-specific context fails. |
| */ |
| int mbedtls_cipher_setup_psa( mbedtls_cipher_context_t *ctx, |
| const mbedtls_cipher_info_t *cipher_info, |
| size_t taglen ); |
| #endif /* MBEDTLS_USE_PSA_CRYPTO */ |
| |
| /** |
| * \brief This function returns the block size of the given cipher. |
| * |
| * \param ctx The context of the cipher. This must be initialized. |
| * |
| * \return The block size of the underlying cipher. |
| * \return \c 0 if \p ctx has not been initialized. |
| */ |
| static inline unsigned int mbedtls_cipher_get_block_size( |
| const mbedtls_cipher_context_t *ctx ) |
| { |
| MBEDTLS_INTERNAL_VALIDATE_RET( ctx != NULL, 0 ); |
| if( ctx->MBEDTLS_PRIVATE(cipher_info) == NULL ) |
| return 0; |
| |
| return ctx->MBEDTLS_PRIVATE(cipher_info)->MBEDTLS_PRIVATE(block_size); |
| } |
| |
| /** |
| * \brief This function returns the mode of operation for |
| * the cipher. For example, MBEDTLS_MODE_CBC. |
| * |
| * \param ctx The context of the cipher. This must be initialized. |
| * |
| * \return The mode of operation. |
| * \return #MBEDTLS_MODE_NONE if \p ctx has not been initialized. |
| */ |
| static inline mbedtls_cipher_mode_t mbedtls_cipher_get_cipher_mode( |
| const mbedtls_cipher_context_t *ctx ) |
| { |
| MBEDTLS_INTERNAL_VALIDATE_RET( ctx != NULL, MBEDTLS_MODE_NONE ); |
| if( ctx->MBEDTLS_PRIVATE(cipher_info) == NULL ) |
| return MBEDTLS_MODE_NONE; |
| |
| return ctx->MBEDTLS_PRIVATE(cipher_info)->MBEDTLS_PRIVATE(mode); |
| } |
| |
| /** |
| * \brief This function returns the size of the IV or nonce |
| * of the cipher, in Bytes. |
| * |
| * \param ctx The context of the cipher. This must be initialized. |
| * |
| * \return The recommended IV size if no IV has been set. |
| * \return \c 0 for ciphers not using an IV or a nonce. |
| * \return The actual size if an IV has been set. |
| */ |
| static inline int mbedtls_cipher_get_iv_size( |
| const mbedtls_cipher_context_t *ctx ) |
| { |
| MBEDTLS_INTERNAL_VALIDATE_RET( ctx != NULL, 0 ); |
| if( ctx->MBEDTLS_PRIVATE(cipher_info) == NULL ) |
| return 0; |
| |
| if( ctx->MBEDTLS_PRIVATE(iv_size) != 0 ) |
| return (int) ctx->MBEDTLS_PRIVATE(iv_size); |
| |
| return (int) ctx->MBEDTLS_PRIVATE(cipher_info)->MBEDTLS_PRIVATE(iv_size); |
| } |
| |
| /** |
| * \brief This function returns the type of the given cipher. |
| * |
| * \param ctx The context of the cipher. This must be initialized. |
| * |
| * \return The type of the cipher. |
| * \return #MBEDTLS_CIPHER_NONE if \p ctx has not been initialized. |
| */ |
| static inline mbedtls_cipher_type_t mbedtls_cipher_get_type( |
| const mbedtls_cipher_context_t *ctx ) |
| { |
| MBEDTLS_INTERNAL_VALIDATE_RET( |
| ctx != NULL, MBEDTLS_CIPHER_NONE ); |
| if( ctx->MBEDTLS_PRIVATE(cipher_info) == NULL ) |
| return MBEDTLS_CIPHER_NONE; |
| |
| return ctx->MBEDTLS_PRIVATE(cipher_info)->MBEDTLS_PRIVATE(type); |
| } |
| |
| /** |
| * \brief This function returns the name of the given cipher |
| * as a string. |
| * |
| * \param ctx The context of the cipher. This must be initialized. |
| * |
| * \return The name of the cipher. |
| * \return NULL if \p ctx has not been not initialized. |
| */ |
| static inline const char *mbedtls_cipher_get_name( |
| const mbedtls_cipher_context_t *ctx ) |
| { |
| MBEDTLS_INTERNAL_VALIDATE_RET( ctx != NULL, 0 ); |
| if( ctx->MBEDTLS_PRIVATE(cipher_info) == NULL ) |
| return 0; |
| |
| return ctx->MBEDTLS_PRIVATE(cipher_info)->MBEDTLS_PRIVATE(name); |
| } |
| |
| /** |
| * \brief This function returns the key length of the cipher. |
| * |
| * \param ctx The context of the cipher. This must be initialized. |
| * |
| * \return The key length of the cipher in bits. |
| * \return #MBEDTLS_KEY_LENGTH_NONE if ctx \p has not been |
| * initialized. |
| */ |
| static inline int mbedtls_cipher_get_key_bitlen( |
| const mbedtls_cipher_context_t *ctx ) |
| { |
| MBEDTLS_INTERNAL_VALIDATE_RET( |
| ctx != NULL, MBEDTLS_KEY_LENGTH_NONE ); |
| if( ctx->MBEDTLS_PRIVATE(cipher_info) == NULL ) |
| return MBEDTLS_KEY_LENGTH_NONE; |
| |
| return (int) ctx->MBEDTLS_PRIVATE(cipher_info)->MBEDTLS_PRIVATE(key_bitlen); |
| } |
| |
| /** |
| * \brief This function returns the operation of the given cipher. |
| * |
| * \param ctx The context of the cipher. This must be initialized. |
| * |
| * \return The type of operation: #MBEDTLS_ENCRYPT or #MBEDTLS_DECRYPT. |
| * \return #MBEDTLS_OPERATION_NONE if \p ctx has not been initialized. |
| */ |
| static inline mbedtls_operation_t mbedtls_cipher_get_operation( |
| const mbedtls_cipher_context_t *ctx ) |
| { |
| MBEDTLS_INTERNAL_VALIDATE_RET( |
| ctx != NULL, MBEDTLS_OPERATION_NONE ); |
| if( ctx->MBEDTLS_PRIVATE(cipher_info) == NULL ) |
| return MBEDTLS_OPERATION_NONE; |
| |
| return ctx->MBEDTLS_PRIVATE(operation); |
| } |
| |
| /** |
| * \brief This function sets the key to use with the given context. |
| * |
| * \param ctx The generic cipher context. This must be initialized and |
| * bound to a cipher information structure. |
| * \param key The key to use. This must be a readable buffer of at |
| * least \p key_bitlen Bits. |
| * \param key_bitlen The key length to use, in Bits. |
| * \param operation The operation that the key will be used for: |
| * #MBEDTLS_ENCRYPT or #MBEDTLS_DECRYPT. |
| * |
| * \return \c 0 on success. |
| * \return #MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA on |
| * parameter-verification failure. |
| * \return A cipher-specific error code on failure. |
| */ |
| int mbedtls_cipher_setkey( mbedtls_cipher_context_t *ctx, |
| const unsigned char *key, |
| int key_bitlen, |
| const mbedtls_operation_t operation ); |
| |
| #if defined(MBEDTLS_CIPHER_MODE_WITH_PADDING) |
| /** |
| * \brief This function sets the padding mode, for cipher modes |
| * that use padding. |
| * |
| * The default passing mode is PKCS7 padding. |
| * |
| * \param ctx The generic cipher context. This must be initialized and |
| * bound to a cipher information structure. |
| * \param mode The padding mode. |
| * |
| * \return \c 0 on success. |
| * \return #MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE |
| * if the selected padding mode is not supported. |
| * \return #MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA if the cipher mode |
| * does not support padding. |
| */ |
| int mbedtls_cipher_set_padding_mode( mbedtls_cipher_context_t *ctx, |
| mbedtls_cipher_padding_t mode ); |
| #endif /* MBEDTLS_CIPHER_MODE_WITH_PADDING */ |
| |
| /** |
| * \brief This function sets the initialization vector (IV) |
| * or nonce. |
| * |
| * \note Some ciphers do not use IVs nor nonce. For these |
| * ciphers, this function has no effect. |
| * |
| * \param ctx The generic cipher context. This must be initialized and |
| * bound to a cipher information structure. |
| * \param iv The IV to use, or NONCE_COUNTER for CTR-mode ciphers. This |
| * must be a readable buffer of at least \p iv_len Bytes. |
| * \param iv_len The IV length for ciphers with variable-size IV. |
| * This parameter is discarded by ciphers with fixed-size IV. |
| * |
| * \return \c 0 on success. |
| * \return #MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA on |
| * parameter-verification failure. |
| */ |
| int mbedtls_cipher_set_iv( mbedtls_cipher_context_t *ctx, |
| const unsigned char *iv, |
| size_t iv_len ); |
| |
| /** |
| * \brief This function resets the cipher state. |
| * |
| * \note With non-AEAD ciphers, the order of calls for each message |
| * is as follows: |
| * 1. mbedtls_cipher_set_iv() if the mode uses an IV/nonce. |
| * 2. mbedtls_cipher_reset() |
| * 3. mbedtls_cipher_update() one or more times |
| * 4. mbedtls_cipher_finish() |
| * . |
| * This sequence can be repeated to encrypt or decrypt multiple |
| * messages with the same key. |
| * |
| * \note With AEAD ciphers, the order of calls for each message |
| * is as follows: |
| * 1. mbedtls_cipher_set_iv() if the mode uses an IV/nonce. |
| * 2. mbedtls_cipher_reset() |
| * 3. mbedtls_cipher_update_ad() |
| * 4. mbedtls_cipher_update() one or more times |
| * 5. mbedtls_cipher_finish() |
| * 6. mbedtls_cipher_check_tag() (for decryption) or |
| * mbedtls_cipher_write_tag() (for encryption). |
| * . |
| * This sequence can be repeated to encrypt or decrypt multiple |
| * messages with the same key. |
| * |
| * \param ctx The generic cipher context. This must be bound to a key. |
| * |
| * \return \c 0 on success. |
| * \return #MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA on |
| * parameter-verification failure. |
| */ |
| int mbedtls_cipher_reset( mbedtls_cipher_context_t *ctx ); |
| |
| #if defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CHACHAPOLY_C) |
| /** |
| * \brief This function adds additional data for AEAD ciphers. |
| * Currently supported with GCM and ChaCha20+Poly1305. |
| * |
| * \param ctx The generic cipher context. This must be initialized. |
| * \param ad The additional data to use. This must be a readable |
| * buffer of at least \p ad_len Bytes. |
| * \param ad_len The length of \p ad in Bytes. |
| * |
| * \return \c 0 on success. |
| * \return A specific error code on failure. |
| */ |
| int mbedtls_cipher_update_ad( mbedtls_cipher_context_t *ctx, |
| const unsigned char *ad, size_t ad_len ); |
| #endif /* MBEDTLS_GCM_C || MBEDTLS_CHACHAPOLY_C */ |
| |
| /** |
| * \brief The generic cipher update function. It encrypts or |
| * decrypts using the given cipher context. Writes as |
| * many block-sized blocks of data as possible to output. |
| * Any data that cannot be written immediately is either |
| * added to the next block, or flushed when |
| * mbedtls_cipher_finish() is called. |
| * Exception: For MBEDTLS_MODE_ECB, expects a single block |
| * in size. For example, 16 Bytes for AES. |
| * |
| * \param ctx The generic cipher context. This must be initialized and |
| * bound to a key. |
| * \param input The buffer holding the input data. This must be a |
| * readable buffer of at least \p ilen Bytes. |
| * \param ilen The length of the input data. |
| * \param output The buffer for the output data. This must be able to |
| * hold at least `ilen + block_size`. This must not be the |
| * same buffer as \p input. |
| * \param olen The length of the output data, to be updated with the |
| * actual number of Bytes written. This must not be |
| * \c NULL. |
| * |
| * \return \c 0 on success. |
| * \return #MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA on |
| * parameter-verification failure. |
| * \return #MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE on an |
| * unsupported mode for a cipher. |
| * \return A cipher-specific error code on failure. |
| */ |
| int mbedtls_cipher_update( mbedtls_cipher_context_t *ctx, |
| const unsigned char *input, |
| size_t ilen, unsigned char *output, |
| size_t *olen ); |
| |
| /** |
| * \brief The generic cipher finalization function. If data still |
| * needs to be flushed from an incomplete block, the data |
| * contained in it is padded to the size of |
| * the last block, and written to the \p output buffer. |
| * |
| * \param ctx The generic cipher context. This must be initialized and |
| * bound to a key. |
| * \param output The buffer to write data to. This needs to be a writable |
| * buffer of at least \p block_size Bytes. |
| * \param olen The length of the data written to the \p output buffer. |
| * This may not be \c NULL. |
| * |
| * \return \c 0 on success. |
| * \return #MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA on |
| * parameter-verification failure. |
| * \return #MBEDTLS_ERR_CIPHER_FULL_BLOCK_EXPECTED on decryption |
| * expecting a full block but not receiving one. |
| * \return #MBEDTLS_ERR_CIPHER_INVALID_PADDING on invalid padding |
| * while decrypting. |
| * \return A cipher-specific error code on failure. |
| */ |
| int mbedtls_cipher_finish( mbedtls_cipher_context_t *ctx, |
| unsigned char *output, size_t *olen ); |
| |
| #if defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CHACHAPOLY_C) |
| /** |
| * \brief This function writes a tag for AEAD ciphers. |
| * Currently supported with GCM and ChaCha20+Poly1305. |
| * This must be called after mbedtls_cipher_finish(). |
| * |
| * \param ctx The generic cipher context. This must be initialized, |
| * bound to a key, and have just completed a cipher |
| * operation through mbedtls_cipher_finish() the tag for |
| * which should be written. |
| * \param tag The buffer to write the tag to. This must be a writable |
| * buffer of at least \p tag_len Bytes. |
| * \param tag_len The length of the tag to write. |
| * |
| * \return \c 0 on success. |
| * \return A specific error code on failure. |
| */ |
| int mbedtls_cipher_write_tag( mbedtls_cipher_context_t *ctx, |
| unsigned char *tag, size_t tag_len ); |
| |
| /** |
| * \brief This function checks the tag for AEAD ciphers. |
| * Currently supported with GCM and ChaCha20+Poly1305. |
| * This must be called after mbedtls_cipher_finish(). |
| * |
| * \param ctx The generic cipher context. This must be initialized. |
| * \param tag The buffer holding the tag. This must be a readable |
| * buffer of at least \p tag_len Bytes. |
| * \param tag_len The length of the tag to check. |
| * |
| * \return \c 0 on success. |
| * \return A specific error code on failure. |
| */ |
| int mbedtls_cipher_check_tag( mbedtls_cipher_context_t *ctx, |
| const unsigned char *tag, size_t tag_len ); |
| #endif /* MBEDTLS_GCM_C || MBEDTLS_CHACHAPOLY_C */ |
| |
| /** |
| * \brief The generic all-in-one encryption/decryption function, |
| * for all ciphers except AEAD constructs. |
| * |
| * \param ctx The generic cipher context. This must be initialized. |
| * \param iv The IV to use, or NONCE_COUNTER for CTR-mode ciphers. |
| * This must be a readable buffer of at least \p iv_len |
| * Bytes. |
| * \param iv_len The IV length for ciphers with variable-size IV. |
| * This parameter is discarded by ciphers with fixed-size |
| * IV. |
| * \param input The buffer holding the input data. This must be a |
| * readable buffer of at least \p ilen Bytes. |
| * \param ilen The length of the input data in Bytes. |
| * \param output The buffer for the output data. This must be able to |
| * hold at least `ilen + block_size`. This must not be the |
| * same buffer as \p input. |
| * \param olen The length of the output data, to be updated with the |
| * actual number of Bytes written. This must not be |
| * \c NULL. |
| * |
| * \note Some ciphers do not use IVs nor nonce. For these |
| * ciphers, use \p iv = NULL and \p iv_len = 0. |
| * |
| * \return \c 0 on success. |
| * \return #MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA on |
| * parameter-verification failure. |
| * \return #MBEDTLS_ERR_CIPHER_FULL_BLOCK_EXPECTED on decryption |
| * expecting a full block but not receiving one. |
| * \return #MBEDTLS_ERR_CIPHER_INVALID_PADDING on invalid padding |
| * while decrypting. |
| * \return A cipher-specific error code on failure. |
| */ |
| int mbedtls_cipher_crypt( mbedtls_cipher_context_t *ctx, |
| const unsigned char *iv, size_t iv_len, |
| const unsigned char *input, size_t ilen, |
| unsigned char *output, size_t *olen ); |
| |
| #if defined(MBEDTLS_CIPHER_MODE_AEAD) || defined(MBEDTLS_NIST_KW_C) |
| /** |
| * \brief The authenticated encryption (AEAD/NIST_KW) function. |
| * |
| * \note For AEAD modes, the tag will be appended to the |
| * ciphertext, as recommended by RFC 5116. |
| * (NIST_KW doesn't have a separate tag.) |
| * |
| * \param ctx The generic cipher context. This must be initialized and |
| * bound to a key, with an AEAD algorithm or NIST_KW. |
| * \param iv The nonce to use. This must be a readable buffer of |
| * at least \p iv_len Bytes and may be \c NULL if \p |
| * iv_len is \c 0. |
| * \param iv_len The length of the nonce. For AEAD ciphers, this must |
| * satisfy the constraints imposed by the cipher used. |
| * For NIST_KW, this must be \c 0. |
| * \param ad The additional data to authenticate. This must be a |
| * readable buffer of at least \p ad_len Bytes, and may |
| * be \c NULL is \p ad_len is \c 0. |
| * \param ad_len The length of \p ad. For NIST_KW, this must be \c 0. |
| * \param input The buffer holding the input data. This must be a |
| * readable buffer of at least \p ilen Bytes, and may be |
| * \c NULL if \p ilen is \c 0. |
| * \param ilen The length of the input data. |
| * \param output The buffer for the output data. This must be a |
| * writable buffer of at least \p output_len Bytes, and |
| * must not be \c NULL. |
| * \param output_len The length of the \p output buffer in Bytes. For AEAD |
| * ciphers, this must be at least \p ilen + \p tag_len. |
| * For NIST_KW, this must be at least \p ilen + 8 |
| * (rounded up to a multiple of 8 if KWP is used); |
| * \p ilen + 15 is always a safe value. |
| * \param olen This will be filled with the actual number of Bytes |
| * written to the \p output buffer. This must point to a |
| * writable object of type \c size_t. |
| * \param tag_len The desired length of the authentication tag. For AEAD |
| * ciphers, this must match the constraints imposed by |
| * the cipher used, and in particular must not be \c 0. |
| * For NIST_KW, this must be \c 0. |
| * |
| * \return \c 0 on success. |
| * \return #MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA on |
| * parameter-verification failure. |
| * \return A cipher-specific error code on failure. |
| */ |
| int mbedtls_cipher_auth_encrypt_ext( mbedtls_cipher_context_t *ctx, |
| const unsigned char *iv, size_t iv_len, |
| const unsigned char *ad, size_t ad_len, |
| const unsigned char *input, size_t ilen, |
| unsigned char *output, size_t output_len, |
| size_t *olen, size_t tag_len ); |
| |
| /** |
| * \brief The authenticated encryption (AEAD/NIST_KW) function. |
| * |
| * \note If the data is not authentic, then the output buffer |
| * is zeroed out to prevent the unauthentic plaintext being |
| * used, making this interface safer. |
| * |
| * \note For AEAD modes, the tag must be appended to the |
| * ciphertext, as recommended by RFC 5116. |
| * (NIST_KW doesn't have a separate tag.) |
| * |
| * \param ctx The generic cipher context. This must be initialized and |
| * bound to a key, with an AEAD algorithm or NIST_KW. |
| * \param iv The nonce to use. This must be a readable buffer of |
| * at least \p iv_len Bytes and may be \c NULL if \p |
| * iv_len is \c 0. |
| * \param iv_len The length of the nonce. For AEAD ciphers, this must |
| * satisfy the constraints imposed by the cipher used. |
| * For NIST_KW, this must be \c 0. |
| * \param ad The additional data to authenticate. This must be a |
| * readable buffer of at least \p ad_len Bytes, and may |
| * be \c NULL is \p ad_len is \c 0. |
| * \param ad_len The length of \p ad. For NIST_KW, this must be \c 0. |
| * \param input The buffer holding the input data. This must be a |
| * readable buffer of at least \p ilen Bytes, and may be |
| * \c NULL if \p ilen is \c 0. |
| * \param ilen The length of the input data. For AEAD ciphers this |
| * must be at least \p tag_len. For NIST_KW this must be |
| * at least \c 8. |
| * \param output The buffer for the output data. This must be a |
| * writable buffer of at least \p output_len Bytes, and |
| * may be \c NULL if \p output_len is \c 0. |
| * \param output_len The length of the \p output buffer in Bytes. For AEAD |
| * ciphers, this must be at least \p ilen - \p tag_len. |
| * For NIST_KW, this must be at least \p ilen - 8. |
| * \param olen This will be filled with the actual number of Bytes |
| * written to the \p output buffer. This must point to a |
| * writable object of type \c size_t. |
| * \param tag_len The actual length of the authentication tag. For AEAD |
| * ciphers, this must match the constraints imposed by |
| * the cipher used, and in particular must not be \c 0. |
| * For NIST_KW, this must be \c 0. |
| * |
| * \return \c 0 on success. |
| * \return #MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA on |
| * parameter-verification failure. |
| * \return #MBEDTLS_ERR_CIPHER_AUTH_FAILED if data is not authentic. |
| * \return A cipher-specific error code on failure. |
| */ |
| int mbedtls_cipher_auth_decrypt_ext( mbedtls_cipher_context_t *ctx, |
| const unsigned char *iv, size_t iv_len, |
| const unsigned char *ad, size_t ad_len, |
| const unsigned char *input, size_t ilen, |
| unsigned char *output, size_t output_len, |
| size_t *olen, size_t tag_len ); |
| #endif /* MBEDTLS_CIPHER_MODE_AEAD || MBEDTLS_NIST_KW_C */ |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif /* MBEDTLS_CIPHER_H */ |
