sha256.h

00001 /**
00002  * \file mbedtls_sha256.h
00003  *
00004  * \brief SHA-224 and SHA-256 cryptographic hash function
00005  *
00006  *  Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
00007  *  SPDX-License-Identifier: Apache-2.0
00008  *
00009  *  Licensed under the Apache License, Version 2.0 (the "License"); you may
00010  *  not use this file except in compliance with the License.
00011  *  You may obtain a copy of the License at
00012  *
00013  *  http://www.apache.org/licenses/LICENSE-2.0
00014  *
00015  *  Unless required by applicable law or agreed to in writing, software
00016  *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
00017  *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00018  *  See the License for the specific language governing permissions and
00019  *  limitations under the License.
00020  *
00021  *  This file is part of mbed TLS (https://tls.mbed.org)
00022  */
00023 #ifndef MBEDTLS_SHA256_H
00024 #define MBEDTLS_SHA256_H
00025 
00026 #if !defined(MBEDTLS_CONFIG_FILE)
00027 #include "config.h"
00028 #else
00029 #include MBEDTLS_CONFIG_FILE
00030 #endif
00031 
00032 #include <stddef.h>
00033 #include <stdint.h>
00034 
00035 #if !defined(MBEDTLS_SHA256_ALT)
00036 // Regular implementation
00037 //
00038 
00039 #ifdef __cplusplus
00040 extern "C" {
00041 #endif
00042 
00043 /**
00044  * \brief          SHA-256 context structure
00045  */
00046 typedef struct
00047 {
00048     uint32_t total[2];          /*!< number of bytes processed  */
00049     uint32_t state[8];          /*!< intermediate digest state  */
00050     unsigned char buffer[64];   /*!< data block being processed */
00051     int is224 ;                  /*!< 0 => SHA-256, else SHA-224 */
00052 }
00053 mbedtls_sha256_context;
00054 
00055 /**
00056  * \brief          Initialize SHA-256 context
00057  *
00058  * \param ctx      SHA-256 context to be initialized
00059  */
00060 void mbedtls_sha256_init( mbedtls_sha256_context *ctx );
00061 
00062 /**
00063  * \brief          Clear SHA-256 context
00064  *
00065  * \param ctx      SHA-256 context to be cleared
00066  */
00067 void mbedtls_sha256_free( mbedtls_sha256_context *ctx );
00068 
00069 /**
00070  * \brief          Clone (the state of) a SHA-256 context
00071  *
00072  * \param dst      The destination context
00073  * \param src      The context to be cloned
00074  */
00075 void mbedtls_sha256_clone( mbedtls_sha256_context *dst,
00076                            const mbedtls_sha256_context *src );
00077 
00078 /**
00079  * \brief          SHA-256 context setup
00080  *
00081  * \param ctx      context to be initialized
00082  * \param is224    0 = use SHA256, 1 = use SHA224
00083  */
00084 void mbedtls_sha256_starts( mbedtls_sha256_context *ctx, int is224 );
00085 
00086 /**
00087  * \brief          SHA-256 process buffer
00088  *
00089  * \param ctx      SHA-256 context
00090  * \param input    buffer holding the  data
00091  * \param ilen     length of the input data
00092  */
00093 void mbedtls_sha256_update( mbedtls_sha256_context *ctx, const unsigned char *input,
00094                     size_t ilen );
00095 
00096 /**
00097  * \brief          SHA-256 final digest
00098  *
00099  * \param ctx      SHA-256 context
00100  * \param output   SHA-224/256 checksum result
00101  */
00102 void mbedtls_sha256_finish( mbedtls_sha256_context *ctx, unsigned char output[32] );
00103 
00104 /* Internal use */
00105 void mbedtls_sha256_process( mbedtls_sha256_context *ctx, const unsigned char data[64] );
00106 
00107 #ifdef __cplusplus
00108 }
00109 #endif
00110 
00111 #else  /* MBEDTLS_SHA256_ALT */
00112 #include "sha256_alt.h"
00113 #endif /* MBEDTLS_SHA256_ALT */
00114 
00115 #ifdef __cplusplus
00116 extern "C" {
00117 #endif
00118 
00119 /**
00120  * \brief          Output = SHA-256( input buffer )
00121  *
00122  * \param input    buffer holding the  data
00123  * \param ilen     length of the input data
00124  * \param output   SHA-224/256 checksum result
00125  * \param is224    0 = use SHA256, 1 = use SHA224
00126  */
00127 void mbedtls_sha256( const unsigned char *input, size_t ilen,
00128            unsigned char output[32], int is224 );
00129 
00130 /**
00131  * \brief          Checkup routine
00132  *
00133  * \return         0 if successful, or 1 if the test failed
00134  */
00135 int mbedtls_sha256_self_test( int verbose );
00136 
00137 #ifdef __cplusplus
00138 }
00139 #endif
00140 
00141 #endif /* mbedtls_sha256.h */