PBKDF2 from PKCS #5. More...

#include <pwdbased.h>

Inheritance diagram for PKCS5_PBKDF2_HMAC< T >:

Collaboration diagram for PKCS5_PBKDF2_HMAC< T >:

Public Member Functions
size_t	MaxDerivedKeyLength () const
	Provides the maximum derived key length. More...

bool	UsesPurposeByte () const
	Determines if the derivation function uses the purpose byte. More...

unsigned int	DeriveKey (byte derived, size_t derivedLen, byte purpose, const byte password, size_t passwordLen, const byte *salt, size_t saltLen, unsigned int iterations, double timeInSeconds=0) const
	Derive key from the password. More...

Public Member Functions inherited from PasswordBasedKeyDerivationFunction
virtual	~PasswordBasedKeyDerivationFunction ()

Detailed Description

template<class T>
class PKCS5_PBKDF2_HMAC< T >

PBKDF2 from PKCS #5.

Template Parameters

T	a HashTransformation class

Definition at line 62 of file pwdbased.h.

Member Function Documentation

template<class T >

unsigned int PKCS5_PBKDF2_HMAC< T >::DeriveKey	(	byte *	derived,
		size_t	derivedLen,
		byte	purpose,
		const byte *	password,
		size_t	passwordLen,
		const byte *	salt,
		size_t	saltLen,
		unsigned int	iterations,
		double	timeInSeconds = `0`
	)		const

virtual

Derive key from the password.

Parameters

derived	the byte buffer to receive the derived password
derivedLen	the size of the byte buffer to receive the derived password
purpose	an octet indicating the purpose of the derivation
password	the byte buffer with the password
passwordLen	the size of the password, in bytes
salt	the byte buffer with the salt
saltLen	the size of the salt, in bytes
iterations	the number of iterations to attempt
timeInSeconds	the length of time the derivation function should execute

Returns: iteration count achieved

DeriveKey returns the actual iteration count achieved. If timeInSeconds == 0, then the complete number of iterations will be obtained. If timeInSeconds != 0, then DeriveKey will iterate until time elapsed, as measured by ThreadUserTimer.

Implements PasswordBasedKeyDerivationFunction.

Definition at line 111 of file pwdbased.h.

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template<class T>

size_t PKCS5_PBKDF2_HMAC< T >::MaxDerivedKeyLength ( ) const

inlinevirtual

Provides the maximum derived key length.