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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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

ctx	The SHA-256 context. This must be initialized.
data	The 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

input	The buffer holding the data. This must be a readable buffer of length `ilen` Bytes.
ilen	The length of the input data in Bytes.
output	The 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.
is224	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.

void mbedtls_sha256_clone	(	mbedtls_sha256_context *	dst,
		const mbedtls_sha256_context *	src
	)

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

Parameters

dst	The destination context. This must be initialized.
src	The 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

ctx	The SHA-256 context. This must be initialized and have a hash operation started.
output	The 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

ctx	The 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

ctx	The 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

ctx	The context to use. This must be initialized.
is224	This 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

ctx	The SHA-256 context. This must be initialized and have a hash operation started.
input	The buffer holding the data. This must be a readable buffer of length `ilen` Bytes.
ilen	The length of the input data in Bytes.

Returns: 0 on success.; A negative error code on failure.

Macros

Functions

Detailed Description

Macro Definition Documentation

Function Documentation