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Diffstat (limited to 'include/mbedtls/des.h')
| -rw-r--r-- | include/mbedtls/des.h | 363 |
1 files changed, 363 insertions, 0 deletions
diff --git a/include/mbedtls/des.h b/include/mbedtls/des.h new file mode 100644 index 000000000..be74cb111 --- /dev/null +++ b/include/mbedtls/des.h @@ -0,0 +1,363 @@ +/** + * \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 */ |