194 lines
6.7 KiB
C
194 lines
6.7 KiB
C
/**
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* \file sha256.h
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*
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* \brief This file contains SHA-224 and SHA-256 definitions and functions.
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*
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* The Secure Hash Algorithms 224 and 256 (SHA-224 and SHA-256) cryptographic
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* hash functions are defined in <em>FIPS 180-4: Secure Hash Standard (SHS)</em>.
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*/
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/*
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* Copyright The Mbed TLS Contributors
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef MBEDTLS_SHA256_H
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#define MBEDTLS_SHA256_H
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#if !defined(MBEDTLS_CONFIG_FILE)
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#include "mbedtls/config.h"
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#else
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#include MBEDTLS_CONFIG_FILE
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#endif
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#include <stddef.h>
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#include <stdint.h>
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#define MBEDTLS_ERR_SHA256_BAD_INPUT_DATA -0x0074 /**< SHA-256 input data was malformed. */
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#ifdef __cplusplus
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extern "C" {
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#endif
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#if !defined(MBEDTLS_SHA256_ALT)
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// Regular implementation
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//
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/**
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* \brief The SHA-256 context structure.
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*
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* The structure is used both for SHA-256 and for SHA-224
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* checksum calculations. The choice between these two is
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* made in the call to mbedtls_sha256_starts_ret().
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*/
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typedef struct mbedtls_sha256_context
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{
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uint32_t total[2]; /*!< The number of Bytes processed. */
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uint32_t state[8]; /*!< The intermediate digest state. */
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unsigned char buffer[64]; /*!< The data block being processed. */
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int is224; /*!< Determines which function to use:
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0: Use SHA-256, or 1: Use SHA-224. */
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}
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mbedtls_sha256_context;
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#else /* MBEDTLS_SHA256_ALT */
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#include "sha256_alt.h"
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#endif /* MBEDTLS_SHA256_ALT */
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/**
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* \brief This function initializes a SHA-256 context.
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*
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* \param ctx The SHA-256 context to initialize. This must not be \c NULL.
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*/
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void mbedtls_sha256_init( mbedtls_sha256_context *ctx );
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/**
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* \brief This function clears a SHA-256 context.
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*
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* \param ctx The SHA-256 context to clear. This may be \c NULL, in which
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* case this function returns immediately. If it is not \c NULL,
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* it must point to an initialized SHA-256 context.
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*/
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void mbedtls_sha256_free( mbedtls_sha256_context *ctx );
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/**
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* \brief This function clones the state of a SHA-256 context.
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*
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* \param dst The destination context. This must be initialized.
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* \param src The context to clone. This must be initialized.
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*/
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void mbedtls_sha256_clone( mbedtls_sha256_context *dst,
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const mbedtls_sha256_context *src );
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/**
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* \brief This function starts a SHA-224 or SHA-256 checksum
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* calculation.
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*
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* \param ctx The context to use. This must be initialized.
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* \param is224 This determines which function to use. This must be
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* either \c 0 for SHA-256, or \c 1 for SHA-224.
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*
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* \return \c 0 on success.
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* \return A negative error code on failure.
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*/
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int mbedtls_sha256_starts_ret( mbedtls_sha256_context *ctx, int is224 );
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/**
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* \brief This function feeds an input buffer into an ongoing
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* SHA-256 checksum calculation.
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*
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* \param ctx The SHA-256 context. This must be initialized
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* and have a hash operation started.
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* \param input The buffer holding the data. This must be a readable
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* buffer of length \p ilen Bytes.
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* \param ilen The length of the input data in Bytes.
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*
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* \return \c 0 on success.
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* \return A negative error code on failure.
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*/
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int mbedtls_sha256_update_ret( mbedtls_sha256_context *ctx,
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const unsigned char *input,
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size_t ilen );
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/**
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* \brief This function finishes the SHA-256 operation, and writes
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* the result to the output buffer.
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*
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* \param ctx The SHA-256 context. This must be initialized
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* and have a hash operation started.
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* \param output The SHA-224 or SHA-256 checksum result.
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* This must be a writable buffer of length \c 32 bytes
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* for SHA-256, \c 28 bytes for SHA-224.
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*
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* \return \c 0 on success.
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* \return A negative error code on failure.
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*/
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int mbedtls_sha256_finish_ret( mbedtls_sha256_context *ctx,
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unsigned char *output );
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/**
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* \brief This function processes a single data block within
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* the ongoing SHA-256 computation. This function is for
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* internal use only.
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*
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* \param ctx The SHA-256 context. This must be initialized.
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* \param data The buffer holding one block of data. This must
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* be a readable buffer of length \c 64 Bytes.
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*
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* \return \c 0 on success.
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* \return A negative error code on failure.
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*/
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int mbedtls_internal_sha256_process( mbedtls_sha256_context *ctx,
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const unsigned char data[64] );
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/**
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* \brief This function calculates the SHA-224 or SHA-256
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* checksum of a buffer.
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*
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* The function allocates the context, performs the
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* calculation, and frees the context.
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*
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* The SHA-256 result is calculated as
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* output = SHA-256(input buffer).
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*
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* \param input The buffer holding the data. This must be a readable
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* buffer of length \p ilen Bytes.
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* \param ilen The length of the input data in Bytes.
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* \param output The SHA-224 or SHA-256 checksum result.
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* This must be a writable buffer of length \c 32 bytes
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* for SHA-256, \c 28 bytes for SHA-224.
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* \param is224 Determines which function to use. This must be
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* either \c 0 for SHA-256, or \c 1 for SHA-224.
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*/
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int mbedtls_sha256_ret( const unsigned char *input,
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size_t ilen,
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unsigned char *output,
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int is224 );
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#if defined(MBEDTLS_SELF_TEST)
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/**
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* \brief The SHA-224 and SHA-256 checkup routine.
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*
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* \return \c 0 on success.
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* \return \c 1 on failure.
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*/
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int mbedtls_sha256_self_test( int verbose );
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#endif /* MBEDTLS_SELF_TEST */
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#ifdef __cplusplus
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}
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#endif
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#endif /* mbedtls_sha256.h */
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