| /** |
| * \file sha256.h |
| * |
| * \brief This file contains SHA-224 and SHA-256 definitions and functions. |
| * |
| * The Secure Hash Algorithms 224 and 256 (SHA-224 and SHA-256) cryptographic |
| * hash functions are defined in <em>FIPS 180-4: Secure Hash Standard (SHS)</em>. |
| */ |
| /* |
| * 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_SHA256_H |
| #define MBEDTLS_SHA256_H |
| #include "mbedtls/private_access.h" |
| |
| #include "mbedtls/build_info.h" |
| |
| #include <stddef.h> |
| #include <stdint.h> |
| |
| #define MBEDTLS_ERR_SHA256_BAD_INPUT_DATA -0x0074 /**< SHA-256 input data was malformed. */ |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| #if !defined(MBEDTLS_SHA256_ALT) |
| // Regular implementation |
| // |
| |
| /** |
| * \brief The SHA-256 context structure. |
| * |
| * The structure is used both for SHA-256 and for SHA-224 |
| * checksum calculations. The choice between these two is |
| * made in the call to mbedtls_sha256_starts(). |
| */ |
| typedef struct mbedtls_sha256_context |
| { |
| uint32_t MBEDTLS_PRIVATE(total)[2]; /*!< The number of Bytes processed. */ |
| uint32_t MBEDTLS_PRIVATE(state)[8]; /*!< The intermediate digest state. */ |
| unsigned char MBEDTLS_PRIVATE(buffer)[64]; /*!< The data block being processed. */ |
| int MBEDTLS_PRIVATE(is224); /*!< Determines which function to use: |
| 0: Use SHA-256, or 1: Use SHA-224. */ |
| } |
| mbedtls_sha256_context; |
| |
| #else /* MBEDTLS_SHA256_ALT */ |
| #include "sha256_alt.h" |
| #endif /* MBEDTLS_SHA256_ALT */ |
| |
| /** |
| * \brief This function initializes a SHA-256 context. |
| * |
| * \param ctx The SHA-256 context to initialize. This must not be \c NULL. |
| */ |
| void mbedtls_sha256_init( mbedtls_sha256_context *ctx ); |
| |
| /** |
| * \brief This function clears a SHA-256 context. |
| * |
| * \param ctx The SHA-256 context to clear. This may be \c NULL, in which |
| * case this function returns immediately. If it is not \c NULL, |
| * it must point to an initialized SHA-256 context. |
| */ |
| void mbedtls_sha256_free( mbedtls_sha256_context *ctx ); |
| |
| /** |
| * \brief This function clones the state of a SHA-256 context. |
| * |
| * \param dst The destination context. This must be initialized. |
| * \param src The context to clone. This must be initialized. |
| */ |
| void mbedtls_sha256_clone( mbedtls_sha256_context *dst, |
| const mbedtls_sha256_context *src ); |
| |
| /** |
| * \brief This function starts a SHA-224 or SHA-256 checksum |
| * calculation. |
| * |
| * \param ctx The context to use. This must be initialized. |
| * \param is224 This determines which function to use. This must be |
| * either \c 0 for SHA-256, or \c 1 for SHA-224. |
| * |
| * \return \c 0 on success. |
| * \return A negative error code on failure. |
| */ |
| int mbedtls_sha256_starts( mbedtls_sha256_context *ctx, int is224 ); |
| |
| /** |
| * \brief This function feeds an input buffer into an ongoing |
| * SHA-256 checksum calculation. |
| * |
| * \param ctx The SHA-256 context. This must be initialized |
| * and have a hash operation started. |
| * \param input The buffer holding the data. This must be a readable |
| * buffer of length \p ilen Bytes. |
| * \param ilen The length of the input data in Bytes. |
| * |
| * \return \c 0 on success. |
| * \return A negative error code on failure. |
| */ |
| int mbedtls_sha256_update( mbedtls_sha256_context *ctx, |
| const unsigned char *input, |
| size_t ilen ); |
| |
| /** |
| * \brief This function finishes the SHA-256 operation, and writes |
| * the result to the output buffer. |
| * |
| * \param ctx The SHA-256 context. This must be initialized |
| * and have a hash operation started. |
| * \param output The SHA-224 or SHA-256 checksum result. |
| * This must be a writable buffer of length \c 32 bytes |
| * for SHA-256, \c 28 bytes for SHA-224. |
| * |
| * \return \c 0 on success. |
| * \return A negative error code on failure. |
| */ |
| int mbedtls_sha256_finish( mbedtls_sha256_context *ctx, |
| unsigned char *output ); |
| |
| /** |
| * \brief This function processes a single data block within |
| * the ongoing SHA-256 computation. This function is for |
| * internal use only. |
| * |
| * \param ctx The SHA-256 context. This must be initialized. |
| * \param data The buffer holding one block of data. This must |
| * be a readable buffer of length \c 64 Bytes. |
| * |
| * \return \c 0 on success. |
| * \return A negative error code on failure. |
| */ |
| int mbedtls_internal_sha256_process( mbedtls_sha256_context *ctx, |
| const unsigned char data[64] ); |
| |
| /** |
| * \brief This function calculates the SHA-224 or SHA-256 |
| * checksum of a buffer. |
| * |
| * The function allocates the context, performs the |
| * calculation, and frees the context. |
| * |
| * The SHA-256 result is calculated as |
| * output = SHA-256(input buffer). |
| * |
| * \param input The buffer holding the data. This must be a readable |
| * buffer of length \p ilen Bytes. |
| * \param ilen The length of the input data in Bytes. |
| * \param output The SHA-224 or SHA-256 checksum result. |
| * This must be a writable buffer of length \c 32 bytes |
| * for SHA-256, \c 28 bytes for SHA-224. |
| * \param is224 Determines which function to use. This must be |
| * either \c 0 for SHA-256, or \c 1 for SHA-224. |
| */ |
| int mbedtls_sha256( const unsigned char *input, |
| size_t ilen, |
| unsigned char *output, |
| int is224 ); |
| |
| #if defined(MBEDTLS_SELF_TEST) |
| |
| /** |
| * \brief The SHA-224 and SHA-256 checkup routine. |
| * |
| * \return \c 0 on success. |
| * \return \c 1 on failure. |
| */ |
| int mbedtls_sha256_self_test( int verbose ); |
| |
| #endif /* MBEDTLS_SELF_TEST */ |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif /* mbedtls_sha256.h */ |
