| /** |
| * \file des.h |
| * |
| * \brief DES block cipher |
| * |
| * \warning DES is considered a weak cipher and its use constitutes a |
| * security risk. We recommend considering stronger ciphers |
| * instead. |
| */ |
| /* |
| * 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_DES_H |
| #define MBEDTLS_DES_H |
| #include "mbedtls/private_access.h" |
| |
| #include "mbedtls/build_info.h" |
| #include "mbedtls/platform_util.h" |
| |
| #include <stddef.h> |
| #include <stdint.h> |
| |
| #define MBEDTLS_DES_ENCRYPT 1 |
| #define MBEDTLS_DES_DECRYPT 0 |
| |
| /** The data input has an invalid length. */ |
| #define MBEDTLS_ERR_DES_INVALID_INPUT_LENGTH -0x0032 |
| |
| #define MBEDTLS_DES_KEY_SIZE 8 |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| #if !defined(MBEDTLS_DES_ALT) |
| // Regular implementation |
| // |
| |
| /** |
| * \brief DES context structure |
| * |
| * \warning DES is considered a weak cipher and its use constitutes a |
| * security risk. We recommend considering stronger ciphers |
| * instead. |
| */ |
| typedef struct mbedtls_des_context |
| { |
| uint32_t MBEDTLS_PRIVATE(sk)[32]; /*!< DES subkeys */ |
| } |
| mbedtls_des_context; |
| |
| /** |
| * \brief Triple-DES context structure |
| */ |
| typedef struct mbedtls_des3_context |
| { |
| uint32_t MBEDTLS_PRIVATE(sk)[96]; /*!< 3DES subkeys */ |
| } |
| mbedtls_des3_context; |
| |
| #else /* MBEDTLS_DES_ALT */ |
| #include "des_alt.h" |
| #endif /* MBEDTLS_DES_ALT */ |
| |
| /** |
| * \brief Initialize DES context |
| * |
| * \param ctx DES context to be initialized |
| * |
| * \warning DES is considered a weak cipher and its use constitutes a |
| * security risk. We recommend considering stronger ciphers |
| * instead. |
| */ |
| void mbedtls_des_init( mbedtls_des_context *ctx ); |
| |
| /** |
| * \brief Clear DES context |
| * |
| * \param ctx DES context to be cleared |
| * |
| * \warning DES is considered a weak cipher and its use constitutes a |
| * security risk. We recommend considering stronger ciphers |
| * instead. |
| */ |
| void mbedtls_des_free( mbedtls_des_context *ctx ); |
| |
| /** |
| * \brief Initialize Triple-DES context |
| * |
| * \param ctx DES3 context to be initialized |
| */ |
| void mbedtls_des3_init( mbedtls_des3_context *ctx ); |
| |
| /** |
| * \brief Clear Triple-DES context |
| * |
| * \param ctx DES3 context to be cleared |
| */ |
| void mbedtls_des3_free( mbedtls_des3_context *ctx ); |
| |
| /** |
| * \brief Set key parity on the given key to odd. |
| * |
| * DES keys are 56 bits long, but each byte is padded with |
| * a parity bit to allow verification. |
| * |
| * \param key 8-byte secret key |
| * |
| * \warning DES is considered a weak cipher and its use constitutes a |
| * security risk. We recommend considering stronger ciphers |
| * instead. |
| */ |
| void mbedtls_des_key_set_parity( unsigned char key[MBEDTLS_DES_KEY_SIZE] ); |
| |
| /** |
| * \brief Check that key parity on the given key is odd. |
| * |
| * DES keys are 56 bits long, but each byte is padded with |
| * a parity bit to allow verification. |
| * |
| * \param key 8-byte secret key |
| * |
| * \return 0 is parity was ok, 1 if parity was not correct. |
| * |
| * \warning DES is considered a weak cipher and its use constitutes a |
| * security risk. We recommend considering stronger ciphers |
| * instead. |
| */ |
| MBEDTLS_CHECK_RETURN_TYPICAL |
| int mbedtls_des_key_check_key_parity( const unsigned char key[MBEDTLS_DES_KEY_SIZE] ); |
| |
| /** |
| * \brief Check that key is not a weak or semi-weak DES key |
| * |
| * \param key 8-byte secret key |
| * |
| * \return 0 if no weak key was found, 1 if a weak key was identified. |
| * |
| * \warning DES is considered a weak cipher and its use constitutes a |
| * security risk. We recommend considering stronger ciphers |
| * instead. |
| */ |
| MBEDTLS_CHECK_RETURN_TYPICAL |
| int mbedtls_des_key_check_weak( const unsigned char key[MBEDTLS_DES_KEY_SIZE] ); |
| |
| /** |
| * \brief DES key schedule (56-bit, encryption) |
| * |
| * \param ctx DES context to be initialized |
| * \param key 8-byte secret key |
| * |
| * \return 0 |
| * |
| * \warning DES is considered a weak cipher and its use constitutes a |
| * security risk. We recommend considering stronger ciphers |
| * instead. |
| */ |
| MBEDTLS_CHECK_RETURN_TYPICAL |
| int mbedtls_des_setkey_enc( mbedtls_des_context *ctx, const unsigned char key[MBEDTLS_DES_KEY_SIZE] ); |
| |
| /** |
| * \brief DES key schedule (56-bit, decryption) |
| * |
| * \param ctx DES context to be initialized |
| * \param key 8-byte secret key |
| * |
| * \return 0 |
| * |
| * \warning DES is considered a weak cipher and its use constitutes a |
| * security risk. We recommend considering stronger ciphers |
| * instead. |
| */ |
| MBEDTLS_CHECK_RETURN_TYPICAL |
| int mbedtls_des_setkey_dec( mbedtls_des_context *ctx, const unsigned char key[MBEDTLS_DES_KEY_SIZE] ); |
| |
| /** |
| * \brief Triple-DES key schedule (112-bit, encryption) |
| * |
| * \param ctx 3DES context to be initialized |
| * \param key 16-byte secret key |
| * |
| * \return 0 |
| */ |
| MBEDTLS_CHECK_RETURN_TYPICAL |
| int mbedtls_des3_set2key_enc( mbedtls_des3_context *ctx, |
| const unsigned char key[MBEDTLS_DES_KEY_SIZE * 2] ); |
| |
| /** |
| * \brief Triple-DES key schedule (112-bit, decryption) |
| * |
| * \param ctx 3DES context to be initialized |
| * \param key 16-byte secret key |
| * |
| * \return 0 |
| */ |
| MBEDTLS_CHECK_RETURN_TYPICAL |
| int mbedtls_des3_set2key_dec( mbedtls_des3_context *ctx, |
| const unsigned char key[MBEDTLS_DES_KEY_SIZE * 2] ); |
| |
| /** |
| * \brief Triple-DES key schedule (168-bit, encryption) |
| * |
| * \param ctx 3DES context to be initialized |
| * \param key 24-byte secret key |
| * |
| * \return 0 |
| */ |
| MBEDTLS_CHECK_RETURN_TYPICAL |
| int mbedtls_des3_set3key_enc( mbedtls_des3_context *ctx, |
| const unsigned char key[MBEDTLS_DES_KEY_SIZE * 3] ); |
| |
| /** |
| * \brief Triple-DES key schedule (168-bit, decryption) |
| * |
| * \param ctx 3DES context to be initialized |
| * \param key 24-byte secret key |
| * |
| * \return 0 |
| */ |
| MBEDTLS_CHECK_RETURN_TYPICAL |
| int mbedtls_des3_set3key_dec( mbedtls_des3_context *ctx, |
| const unsigned char key[MBEDTLS_DES_KEY_SIZE * 3] ); |
| |
| /** |
| * \brief DES-ECB block encryption/decryption |
| * |
| * \param ctx DES context |
| * \param input 64-bit input block |
| * \param output 64-bit output block |
| * |
| * \return 0 if successful |
| * |
| * \warning DES is considered a weak cipher and its use constitutes a |
| * security risk. We recommend considering stronger ciphers |
| * instead. |
| */ |
| MBEDTLS_CHECK_RETURN_TYPICAL |
| int mbedtls_des_crypt_ecb( mbedtls_des_context *ctx, |
| const unsigned char input[8], |
| unsigned char output[8] ); |
| |
| #if defined(MBEDTLS_CIPHER_MODE_CBC) |
| /** |
| * \brief DES-CBC buffer encryption/decryption |
| * |
| * \note Upon exit, the content of the IV is updated so that you can |
| * call the function same function again on the following |
| * block(s) of data and get the same result as if it was |
| * encrypted in one call. This allows a "streaming" usage. |
| * If on the other hand you need to retain the contents of the |
| * IV, you should either save it manually or use the cipher |
| * module instead. |
| * |
| * \param ctx DES context |
| * \param mode MBEDTLS_DES_ENCRYPT or MBEDTLS_DES_DECRYPT |
| * \param length length of the input data |
| * \param iv initialization vector (updated after use) |
| * \param input buffer holding the input data |
| * \param output buffer holding the output data |
| * |
| * \warning DES is considered a weak cipher and its use constitutes a |
| * security risk. We recommend considering stronger ciphers |
| * instead. |
| */ |
| MBEDTLS_CHECK_RETURN_TYPICAL |
| int mbedtls_des_crypt_cbc( mbedtls_des_context *ctx, |
| int mode, |
| size_t length, |
| unsigned char iv[8], |
| const unsigned char *input, |
| unsigned char *output ); |
| #endif /* MBEDTLS_CIPHER_MODE_CBC */ |
| |
| /** |
| * \brief 3DES-ECB block encryption/decryption |
| * |
| * \param ctx 3DES context |
| * \param input 64-bit input block |
| * \param output 64-bit output block |
| * |
| * \return 0 if successful |
| */ |
| MBEDTLS_CHECK_RETURN_TYPICAL |
| int mbedtls_des3_crypt_ecb( mbedtls_des3_context *ctx, |
| const unsigned char input[8], |
| unsigned char output[8] ); |
| |
| #if defined(MBEDTLS_CIPHER_MODE_CBC) |
| /** |
| * \brief 3DES-CBC buffer encryption/decryption |
| * |
| * \note Upon exit, the content of the IV is updated so that you can |
| * call the function same function again on the following |
| * block(s) of data and get the same result as if it was |
| * encrypted in one call. This allows a "streaming" usage. |
| * If on the other hand you need to retain the contents of the |
| * IV, you should either save it manually or use the cipher |
| * module instead. |
| * |
| * \param ctx 3DES context |
| * \param mode MBEDTLS_DES_ENCRYPT or MBEDTLS_DES_DECRYPT |
| * \param length length of the input data |
| * \param iv initialization vector (updated after use) |
| * \param input buffer holding the input data |
| * \param output buffer holding the output data |
| * |
| * \return 0 if successful, or MBEDTLS_ERR_DES_INVALID_INPUT_LENGTH |
| */ |
| MBEDTLS_CHECK_RETURN_TYPICAL |
| int mbedtls_des3_crypt_cbc( mbedtls_des3_context *ctx, |
| int mode, |
| size_t length, |
| unsigned char iv[8], |
| const unsigned char *input, |
| unsigned char *output ); |
| #endif /* MBEDTLS_CIPHER_MODE_CBC */ |
| |
| /** |
| * \brief Internal function for key expansion. |
| * (Only exposed to allow overriding it, |
| * see MBEDTLS_DES_SETKEY_ALT) |
| * |
| * \param SK Round keys |
| * \param key Base key |
| * |
| * \warning DES is considered a weak cipher and its use constitutes a |
| * security risk. We recommend considering stronger ciphers |
| * instead. |
| */ |
| void mbedtls_des_setkey( uint32_t SK[32], |
| const unsigned char key[MBEDTLS_DES_KEY_SIZE] ); |
| |
| #if defined(MBEDTLS_SELF_TEST) |
| |
| /** |
| * \brief Checkup routine |
| * |
| * \return 0 if successful, or 1 if the test failed |
| */ |
| MBEDTLS_CHECK_RETURN_CRITICAL |
| int mbedtls_des_self_test( int verbose ); |
| |
| #endif /* MBEDTLS_SELF_TEST */ |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif /* des.h */ |