ch.imvs.sdes4j.srtp

Class SrtpSDesFactory

java.lang.Object

ch.imvs.sdes4j.srtp.SrtpSDesFactory

All Implemented Interfaces:

SDesFactory

public class SrtpSDesFactory
extends Object
implements SDesFactory

Factory for the SRTP grammar of RFC4568.

Author:

Ingo Bauersachs

Constructor Summary

Constructors

Constructor and Description
SrtpSDesFactory()

Method Summary

Modifier and Type	Method and Description
SrtpCryptoAttribute	createCryptoAttribute() Creates an empty crypto attribute for the grammar implementing this interface.
SrtpCryptoAttribute	createCryptoAttribute(int tag, String keyAlg) Creates an SRTP crypto attribute with the specified parameters, for use in an SDP.
SrtpCryptoAttribute	createCryptoAttribute(int tag, String keyAlg, SrtpSessionParam[] params) Creates an SRTP crypto attribute with the specified parameters, for use in an SDP.
SrtpCryptoSuite	createCryptoSuite(String suite) Creates a crypto suite instance for the grammar implementing this interface.
SrtpKeyParam	createKeyParam(String keyParam) Creates a key parameter instance for the grammar implementing this interface.
SrtpKeyParam[]	createKeyParamArray(int size) Utility method to create a typed array of KeyParameters.
SrtpSessionParam	createSessionParam(String sessionParam) Creates a session parameter instance for the grammar implementing this interface.
SrtpSessionParam[]	createSessionParamArray(int size) Utility method to create a typed array of SessionParams.
void	setRandomGenerator(Random r) Sets the random number generator to be used for generating the SDES keys.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

SrtpSDesFactory

public SrtpSDesFactory()

Method Detail

createCryptoAttribute

public SrtpCryptoAttribute createCryptoAttribute(int tag,
                                                 String keyAlg)

Creates an SRTP crypto attribute with the specified parameters, for use in an SDP.

If no random generator is set with setRandomGenerator(Random) then the SHA1PRNG, or if not available, the system's default SecureRandom will be used.

Parameters:

tag - decimal number used as an identifier for a particular crypto attribute

keyAlg - identifier that describes the encryption and authentication algorithms

Returns:

SRTP crypto attribute without session parameters.

createCryptoAttribute

public SrtpCryptoAttribute createCryptoAttribute(int tag,
                                                 String keyAlg,
                                                 SrtpSessionParam[] params)

Creates an SRTP crypto attribute with the specified parameters, for use in an SDP.

Parameters:

tag - decimal number used as an identifier for a particular crypto attribute

keyAlg - identifier that describes the encryption and authentication algorithms

params - Session parameters for the crypto attribute

Returns:

SRTP crypto attribute without session parameters.

setRandomGenerator

public void setRandomGenerator(Random r)

Description copied from interface: SDesFactory

Sets the random number generator to be used for generating the SDES keys.

Specified by:

setRandomGenerator in interface SDesFactory

Parameters:

r - The random number generator.

createCryptoAttribute

public SrtpCryptoAttribute createCryptoAttribute()

Description copied from interface: SDesFactory

Creates an empty crypto attribute for the grammar implementing this interface.

Specified by:

createCryptoAttribute in interface SDesFactory

Returns:

Empty crypto attribute to be filled by a parser.

createCryptoSuite

public SrtpCryptoSuite createCryptoSuite(String suite)

Description copied from interface: SDesFactory

Creates a crypto suite instance for the grammar implementing this interface.

Specified by:

createCryptoSuite in interface SDesFactory

Parameters:

suite - The suite name that defines the cryptographic parameters.

Returns:

A crypto suite instance based on the supplied suite name.

createKeyParam

public SrtpKeyParam createKeyParam(String keyParam)

Description copied from interface: SDesFactory

Creates a key parameter instance for the grammar implementing this interface.

Specified by:

createKeyParam in interface SDesFactory

Parameters:

keyParam - The textual representation of the key parameter field.

Returns:

The parsed key parameter.

createKeyParamArray

public SrtpKeyParam[] createKeyParamArray(int size)

Description copied from interface: SDesFactory

Utility method to create a typed array of KeyParameters.

Specified by:

createKeyParamArray in interface SDesFactory

Parameters:

size - The size of the array to create.

Returns:

KeyParam array of the specified size.

createSessionParam

public SrtpSessionParam createSessionParam(String sessionParam)

Description copied from interface: SDesFactory

Creates a session parameter instance for the grammar implementing this interface.

Specified by:

createSessionParam in interface SDesFactory

Parameters:

sessionParam - The textual representation of the session parameter.

Returns:

The parsed session parameter.

createSessionParamArray

public SrtpSessionParam[] createSessionParamArray(int size)

Description copied from interface: SDesFactory

Utility method to create a typed array of SessionParams.

Specified by:

createSessionParamArray in interface SDesFactory

Parameters:

size - The size of the array to create.

Returns:

SessionParam array of the specified size.