hash_drbg.c File Reference

Hash_DRBG pseudorandom number generator. More...

#include "core/crypto.h"
#include "rng/hash_drbg.h"
#include "debug.h"

Go to the source code of this file.

Macros
#define	TRACE_LEVEL   CRYPTO_TRACE_LEVEL

Functions
error_t	hashDrbgInit (HashDrbgContext *context, const HashAlgo *hashAlgo)
	Initialize PRNG context. More...
error_t	hashDrbgSeed (HashDrbgContext *context, const uint8_t *seed, size_t length)
	Seed the PRNG state. More...
error_t	hashDrbgSeedEx (HashDrbgContext *context, const uint8_t *entropyInput, size_t entropyInputLen, const uint8_t *nonce, size_t nonceLen, const uint8_t *personalizationString, size_t personalizationStringLen)
	Seed the PRNG state (with nonce and personalization string) More...
error_t	hashDrbgReseed (HashDrbgContext *context, const uint8_t *seed, size_t length)
	Reseed the PRNG state. More...
error_t	hashDrbgReseedEx (HashDrbgContext *context, const uint8_t *entropyInput, size_t entropyInputLen, const uint8_t *additionalInput, size_t additionalInputLen)
	Reseed the PRNG state (with additional input) More...
error_t	hashDrbgGenerate (HashDrbgContext *context, uint8_t *output, size_t length)
	Generate pseudorandom data. More...
error_t	hashDrbgGenerateEx (HashDrbgContext *context, const uint8_t *additionalInput, size_t additionalInputLen, uint8_t *output, size_t outputLen)
	Generate pseudorandom data (with additional input) More...
void	hashDrbgDeinit (HashDrbgContext *context)
	Release PRNG context. More...
void	hashDf (HashDrbgContext *context, const DataChunk *input, uint_t inputLen, uint8_t *output, size_t outputLen)
	Hash derivation function. More...
void	hashGen (HashDrbgContext *context, uint8_t *output, size_t outputLen)
	Hash generation sub function. More...
void	hashDrbgAdd (uint8_t *a, size_t aLen, const uint8_t *b, size_t bLen)
	Add blocks. More...
void	hashDrbgInc (uint8_t *a, size_t aLen)
	Increment block. More...

Variables
const PrngAlgo	hashDrbgPrngAlgo

Detailed Description

Hash_DRBG pseudorandom number generator.

License

SPDX-License-Identifier: GPL-2.0-or-later

Copyright (C) 2010-2025 Oryx Embedded SARL. All rights reserved.

This file is part of CycloneCRYPTO Open.

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

Author

Oryx Embedded SARL (www.oryx-embedded.com)

Version

2.5.4

Definition in file hash_drbg.c.

Macro Definition Documentation

TRACE_LEVEL

#define TRACE_LEVEL   CRYPTO_TRACE_LEVEL

Definition at line 32 of file hash_drbg.c.

Function Documentation

hashDf()

void hashDf	(	HashDrbgContext *	context,
		const DataChunk *	input,
		uint_t	inputLen,
		uint8_t *	output,
		size_t	outputLen
	)

Hash derivation function.

Parameters

[in]	context	Pointer to the Hash_DRBG context
[in]	input	The string to be hashed
[in]	inputLen	Number of data chunks representing the input
[out]	output	Buffer where to store the output value
[out]	outputLen	The number of bytes to be returned

Definition at line 463 of file hash_drbg.c.

hashDrbgAdd()

void hashDrbgAdd	(	uint8_t *	a,
		size_t	aLen,
		const uint8_t *	b,
		size_t	bLen
	)

Add blocks.

Parameters

[in,out]	a	Pointer to the first block
[in]	aLen	Length of the first block, in bytes
[in]	b	Pointer to the second block
[in]	bLen	Length of the second block, in bytes

Definition at line 565 of file hash_drbg.c.

hashDrbgDeinit()

void hashDrbgDeinit

(

HashDrbgContext *

context

)

Release PRNG context.

Parameters

[in]

context

Pointer to the Hash_DRBG context

Definition at line 440 of file hash_drbg.c.

hashDrbgGenerate()

error_t hashDrbgGenerate	(	HashDrbgContext *	context,
		uint8_t *	output,
		size_t	length
	)

Generate pseudorandom data.

Parameters

[in]	context	Pointer to the Hash_DRBG context
[out]	output	Buffer where to store the pseudorandom bytes
[in]	length	Requested number of bytes

Returns

Error code

Definition at line 327 of file hash_drbg.c.

hashDrbgGenerateEx()

error_t hashDrbgGenerateEx	(	HashDrbgContext *	context,
		const uint8_t *	additionalInput,
		size_t	additionalInputLen,
		uint8_t *	output,
		size_t	outputLen
	)

Generate pseudorandom data (with additional input)

Parameters

[in]	context	Pointer to the Hash_DRBG context
[in]	additionalInput	Additional input string received from the consuming application
[in]	additionalInputLen	Length of the additional input string, in bytes
[out]	output	Buffer where to store the pseudorandom bytes
[in]	outputLen	Requested number of bytes

Returns

Error code

Definition at line 346 of file hash_drbg.c.

hashDrbgInc()

void hashDrbgInc	(	uint8_t *	a,
		size_t	aLen
	)

Increment block.

Parameters

[in]	a	Pointer to the block to be incremented
[in]	aLen	Length of the block, in bytes

Definition at line 588 of file hash_drbg.c.

hashDrbgInit()

error_t hashDrbgInit	(	HashDrbgContext *	context,
		const HashAlgo *	hashAlgo
	)

Initialize PRNG context.

Parameters

[in]	context	Pointer to the Hash_DRBG context to initialize
[in]	hashAlgo	Approved hash function

Returns

Error code

Definition at line 62 of file hash_drbg.c.

hashDrbgReseed()

error_t hashDrbgReseed	(	HashDrbgContext *	context,
		const uint8_t *	seed,
		size_t	length
	)

Reseed the PRNG state.

Parameters

[in]	context	Pointer to the Hash_DRBG context
[in]	seed	String of bits obtained from the randomness source
[in]	length	Length of the string, in bytes

Returns

Error code

Definition at line 225 of file hash_drbg.c.

hashDrbgReseedEx()

error_t hashDrbgReseedEx	(	HashDrbgContext *	context,
		const uint8_t *	entropyInput,
		size_t	entropyInputLen,
		const uint8_t *	additionalInput,
		size_t	additionalInputLen
	)

Reseed the PRNG state (with additional input)

Parameters

[in]	context	Pointer to the Hash_DRBG context
[in]	entropyInput	String of bits obtained from the randomness source
[in]	entropyInputLen	Length of the string, in bytes
[in]	additionalInput	Additional input string received from the consuming application
[in]	additionalInputLen	Length of the additional input string, in bytes

Returns

Error code

Definition at line 244 of file hash_drbg.c.

hashDrbgSeed()

error_t hashDrbgSeed	(	HashDrbgContext *	context,
		const uint8_t *	seed,
		size_t	length
	)

Seed the PRNG state.

Parameters

[in]	context	Pointer to the Hash_DRBG context
[in]	seed	String of bits obtained from the randomness source
[in]	length	Length of the string, in bytes

Returns

Error code

Definition at line 120 of file hash_drbg.c.

hashDrbgSeedEx()

error_t hashDrbgSeedEx	(	HashDrbgContext *	context,
		const uint8_t *	entropyInput,
		size_t	entropyInputLen,
		const uint8_t *	nonce,
		size_t	nonceLen,
		const uint8_t *	personalizationString,
		size_t	personalizationStringLen
	)

Seed the PRNG state (with nonce and personalization string)

Parameters

[in]	context	Pointer to the Hash_DRBG context
[in]	entropyInput	String of bits obtained from the randomness source
[in]	entropyInputLen	Length of the string, in bytes
[in]	nonce	Nonce
[in]	nonceLen	Length of the nonce, in bytes
[in]	personalizationString	Personalization string received from the consuming application
[in]	personalizationStringLen	Length of the personalization string, in bytes

Returns

Error code

Definition at line 142 of file hash_drbg.c.

hashGen()

void hashGen	(	HashDrbgContext *	context,
		uint8_t *	output,
		size_t	outputLen
	)

Hash generation sub function.

Parameters

[in]	context	Pointer to the Hash_DRBG context
[out]	output	Buffer where to store the output value
[out]	outputLen	The number of bytes to be returned

Definition at line 517 of file hash_drbg.c.

Variable Documentation

hashDrbgPrngAlgo

const PrngAlgo hashDrbgPrngAlgo

Initial value:

=
{
   "Hash_DRBG",
   sizeof(HashDrbgContext),
   (PrngAlgoInit) NULL,
   (PrngAlgoSeed) hashDrbgSeed,
   (PrngAlgoReseed) hashDrbgReseed,
   (PrngAlgoGenerate) hashDrbgGenerate,
   (PrngAlgoDeinit) hashDrbgDeinit
}

Definition at line 43 of file hash_drbg.c.