hmac_drbg.c File Reference

HMAC_DRBG pseudorandom number generator. More...

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

Go to the source code of this file.

Macros
#define	TRACE_LEVEL   CRYPTO_TRACE_LEVEL

Functions
error_t	hmacDrbgInit (HmacDrbgContext *context, const HashAlgo *hashAlgo)
	Initialize PRNG context. More...
error_t	hmacDrbgSeed (HmacDrbgContext *context, const uint8_t *seed, size_t length)
	Seed the PRNG state. More...
error_t	hmacDrbgSeedEx (HmacDrbgContext *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	hmacDrbgReseed (HmacDrbgContext *context, const uint8_t *seed, size_t length)
	Reseed the PRNG state. More...
error_t	hmacDrbgReseedEx (HmacDrbgContext *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	hmacDrbgGenerate (HmacDrbgContext *context, uint8_t *output, size_t length)
	Generate pseudorandom data. More...
error_t	hmacDrbgGenerateEx (HmacDrbgContext *context, const uint8_t *additionalInput, size_t additionalInputLen, uint8_t *output, size_t outputLen)
	Generate pseudorandom data (with additional input) More...
void	hmacDrbgDeinit (HmacDrbgContext *context)
	Release PRNG context. More...
void	hmacDrbgUpdate (HmacDrbgContext *context, const DataChunk *providedData, uint_t providedDataLen)
	Update internal state. More...

Variables
const PrngAlgo	hmacDrbgPrngAlgo

Detailed Description

HMAC_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 hmac_drbg.c.

Macro Definition Documentation

TRACE_LEVEL

#define TRACE_LEVEL   CRYPTO_TRACE_LEVEL

Definition at line 32 of file hmac_drbg.c.

Function Documentation

hmacDrbgDeinit()

void hmacDrbgDeinit

(

HmacDrbgContext *

context

)

Release PRNG context.

Parameters

[in]

context

Pointer to the HMAC_DRBG context

Definition at line 401 of file hmac_drbg.c.

hmacDrbgGenerate()

error_t hmacDrbgGenerate	(	HmacDrbgContext *	context,
		uint8_t *	output,
		size_t	length
	)

Generate pseudorandom data.

Parameters

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

Returns

Error code

Definition at line 287 of file hmac_drbg.c.

hmacDrbgGenerateEx()

error_t hmacDrbgGenerateEx	(	HmacDrbgContext *	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 HMAC_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 306 of file hmac_drbg.c.

hmacDrbgInit()

error_t hmacDrbgInit	(	HmacDrbgContext *	context,
		const HashAlgo *	hashAlgo
	)

Initialize PRNG context.

Parameters

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

Returns

Error code

Definition at line 62 of file hmac_drbg.c.

hmacDrbgReseed()

error_t hmacDrbgReseed	(	HmacDrbgContext *	context,
		const uint8_t *	seed,
		size_t	length
	)

Reseed the PRNG state.

Parameters

[in]	context	Pointer to the HMAC_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 209 of file hmac_drbg.c.

hmacDrbgReseedEx()

error_t hmacDrbgReseedEx	(	HmacDrbgContext *	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 HMAC_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 228 of file hmac_drbg.c.

hmacDrbgSeed()

error_t hmacDrbgSeed	(	HmacDrbgContext *	context,
		const uint8_t *	seed,
		size_t	length
	)

Seed the PRNG state.

Parameters

[in]	context	Pointer to the HMAC_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 109 of file hmac_drbg.c.

hmacDrbgSeedEx()

error_t hmacDrbgSeedEx	(	HmacDrbgContext *	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 HMAC_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 131 of file hmac_drbg.c.

hmacDrbgUpdate()

void hmacDrbgUpdate	(	HmacDrbgContext *	context,
		const DataChunk *	providedData,
		uint_t	providedDataLen
	)

Update internal state.

Parameters

[in]	context	Pointer to the HMAC_DRBG context
[in]	providedData	The data to be used
[in]	providedDataLen	Number of data chunks representing the data

Definition at line 422 of file hmac_drbg.c.

Variable Documentation

hmacDrbgPrngAlgo

const PrngAlgo hmacDrbgPrngAlgo

Initial value:

=
{
   "HMAC_DRBG",
   sizeof(HmacDrbgContext),
   (PrngAlgoInit) NULL,
   (PrngAlgoSeed) hmacDrbgSeed,
   (PrngAlgoReseed) hmacDrbgReseed,
   (PrngAlgoGenerate) hmacDrbgGenerate,
   (PrngAlgoDeinit) hmacDrbgDeinit
}

Definition at line 43 of file hmac_drbg.c.