mbed TLS v3.1.0
Macros | Functions
sha256.h File Reference

This file contains SHA-224 and SHA-256 definitions and functions. More...

#include "mbedtls/private_access.h"
#include "mbedtls/build_info.h"
#include <stddef.h>
#include <stdint.h>
#include "sha256_alt.h"
Include dependency graph for sha256.h:
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Go to the source code of this file.

Macros

#define MBEDTLS_ERR_SHA256_BAD_INPUT_DATA   -0x0074
 

Functions

void mbedtls_sha256_init (mbedtls_sha256_context *ctx)
 This function initializes a SHA-256 context. More...
 
void mbedtls_sha256_free (mbedtls_sha256_context *ctx)
 This function clears a SHA-256 context. More...
 
void mbedtls_sha256_clone (mbedtls_sha256_context *dst, const mbedtls_sha256_context *src)
 This function clones the state of a SHA-256 context. More...
 
int mbedtls_sha256_starts (mbedtls_sha256_context *ctx, int is224)
 This function starts a SHA-224 or SHA-256 checksum calculation. More...
 
int mbedtls_sha256_update (mbedtls_sha256_context *ctx, const unsigned char *input, size_t ilen)
 This function feeds an input buffer into an ongoing SHA-256 checksum calculation. More...
 
int mbedtls_sha256_finish (mbedtls_sha256_context *ctx, unsigned char *output)
 This function finishes the SHA-256 operation, and writes the result to the output buffer. More...
 
int mbedtls_internal_sha256_process (mbedtls_sha256_context *ctx, const unsigned char data[64])
 This function processes a single data block within the ongoing SHA-256 computation. This function is for internal use only. More...
 
int mbedtls_sha256 (const unsigned char *input, size_t ilen, unsigned char *output, int is224)
 This function calculates the SHA-224 or SHA-256 checksum of a buffer. More...
 
int mbedtls_sha256_self_test (int verbose)
 The SHA-224 and SHA-256 checkup routine. More...
 

Detailed Description

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 FIPS 180-4: Secure Hash Standard (SHS).

Definition in file sha256.h.

Macro Definition Documentation

#define MBEDTLS_ERR_SHA256_BAD_INPUT_DATA   -0x0074

SHA-256 input data was malformed.

Definition at line 35 of file sha256.h.

Function Documentation

int mbedtls_internal_sha256_process ( mbedtls_sha256_context *  ctx,
const unsigned char  data[64] 
)

This function processes a single data block within the ongoing SHA-256 computation. This function is for internal use only.

Parameters
ctxThe SHA-256 context. This must be initialized.
dataThe buffer holding one block of data. This must be a readable buffer of length 64 Bytes.
Returns
0 on success.
A negative error code on failure.
int mbedtls_sha256 ( const unsigned char *  input,
size_t  ilen,
unsigned char *  output,
int  is224 
)

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).

Parameters
inputThe buffer holding the data. This must be a readable buffer of length ilen Bytes.
ilenThe length of the input data in Bytes.
outputThe SHA-224 or SHA-256 checksum result. This must be a writable buffer of length 32 bytes for SHA-256, 28 bytes for SHA-224.
is224Determines which function to use. This must be either 0 for SHA-256, or 1 for SHA-224.
Returns
0 on success.
A negative error code on failure.
void mbedtls_sha256_clone ( mbedtls_sha256_context *  dst,
const mbedtls_sha256_context *  src 
)

This function clones the state of a SHA-256 context.

Parameters
dstThe destination context. This must be initialized.
srcThe context to clone. This must be initialized.
int mbedtls_sha256_finish ( mbedtls_sha256_context *  ctx,
unsigned char *  output 
)

This function finishes the SHA-256 operation, and writes the result to the output buffer.

Parameters
ctxThe SHA-256 context. This must be initialized and have a hash operation started.
outputThe SHA-224 or SHA-256 checksum result. This must be a writable buffer of length 32 bytes for SHA-256, 28 bytes for SHA-224.
Returns
0 on success.
A negative error code on failure.
void mbedtls_sha256_free ( mbedtls_sha256_context *  ctx)

This function clears a SHA-256 context.

Parameters
ctxThe SHA-256 context to clear. This may be NULL, in which case this function returns immediately. If it is not NULL, it must point to an initialized SHA-256 context.
void mbedtls_sha256_init ( mbedtls_sha256_context *  ctx)

This function initializes a SHA-256 context.

Parameters
ctxThe SHA-256 context to initialize. This must not be NULL.
int mbedtls_sha256_self_test ( int  verbose)

The SHA-224 and SHA-256 checkup routine.

Returns
0 on success.
1 on failure.
int mbedtls_sha256_starts ( mbedtls_sha256_context *  ctx,
int  is224 
)

This function starts a SHA-224 or SHA-256 checksum calculation.

Parameters
ctxThe context to use. This must be initialized.
is224This determines which function to use. This must be either 0 for SHA-256, or 1 for SHA-224.
Returns
0 on success.
A negative error code on failure.
int mbedtls_sha256_update ( mbedtls_sha256_context *  ctx,
const unsigned char *  input,
size_t  ilen 
)

This function feeds an input buffer into an ongoing SHA-256 checksum calculation.

Parameters
ctxThe SHA-256 context. This must be initialized and have a hash operation started.
inputThe buffer holding the data. This must be a readable buffer of length ilen Bytes.
ilenThe length of the input data in Bytes.
Returns
0 on success.
A negative error code on failure.