Package net.messagevortex.asn1

Class AsymmetricKey

java.lang.Object

net.messagevortex.asn1.AbstractBlock

net.messagevortex.asn1.Key

net.messagevortex.asn1.AsymmetricKey

All Implemented Interfaces:

Serializable, Block, Dumpable

public class AsymmetricKey
extends Key
implements Serializable, Dumpable

Asymmetric Key Handling.

This class parses and encodes Asymmetric keys from/to ASN.1. It furthermore handles encoding and decoding of encrypted material.

See Also:

• Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
protected byte[]	privateKey
protected byte[]	publicKey
static final long	serialVersionUID

Fields inherited from class net.messagevortex.asn1.AbstractBlock

CRLF

Constructor Summary

Constructors

Constructor	Description
AsymmetricKey()	Creates a new Asymmetric key based on the default values.
AsymmetricKey(byte[] b)	Creates an asymmetric key based on the byte sequence.
AsymmetricKey(AlgorithmParameter params)	creates a new asymmetric key based on the parameters given.
AsymmetricKey(AlgorithmParameter params, boolean allowPrecalculated)	creates a new asymmetric key based on the parameters given.
AsymmetricKey(AsymmetricKey ak)	Copy Constructor.

Method Summary

Modifier and Type	Method	Description
byte[]	decrypt(byte[] b)	Decrypts a byte array using the key contained in this object.
String	dumpValueNotation(String prefix)	Generates the ASN1 notation of the object.
String	dumpValueNotation(String prefix, DumpType dumpType)	Generates the ASN1 notation of the object.
byte[]	encrypt(byte[] b)	Encrypts a byte array using the key contained in this object.
boolean	equals(Object key)	tests two asymmetric keys for equality.
Algorithm	getAlgorithm()	Gets the algorithm of this key type.
AlgorithmParameter	getAlgorithmParameter()	Gets the full algorithm parameters of this key.
int	getBlockSize()	Gets the size of the key stored in this object.
static String	getCacheFileName()
static double	getDequeueProbability()	Gets the current probability for dequeing a used key (nolrmally 1.0)
int	getKeySize()	Gets the size of the key stored in this object.
Mode	getMode()	Gets the mode used for encryption.
Padding	getPadding()	Gets the padding used for encryption.
byte[]	getPrivateKey()	Gets the private key of this object.
byte[]	getPublicKey()	Gets the public key in binary representation.
int	hashCode()	returns the hashcode of the dump representation.
boolean	hasPrivateKey()	Checks if the object contains a private key.
protected final void	parse(org.bouncycastle.asn1.ASN1Encodable to)
static String	setCacheFileName(String name)
static double	setDequeueProbability(double probability)	Sets the probability of reusing a precalculated key again.
Mode	setMode(Mode m)	Sets the mode used for encryption.
Padding	setPadding(Padding p)	Sets the padding used for encryption.
byte[]	setPrivateKey(byte[] b)	Sets the private key of this object.
byte[]	setPublicKey(byte[] b)	Sets the public key.
byte[]	sign(byte[] b)	Signs a byte array.
byte[]	sign(byte[] b, Algorithm mac)	Signs a byte array.
org.bouncycastle.asn1.ASN1Object	toAsn1Object(DumpType dt)	Dumps the key as ASN1 object.
String	toString()	Gets a textual representation of the objects parameters (without the keys).
boolean	verify(byte[] b, byte[] sig)	Verifies a given signature accourding to the objects public key.
boolean	verify(byte[] b, byte[] sig, Algorithm mac)	Verifies a given signature accourding to the objects public key.

Methods inherited from class net.messagevortex.asn1.AbstractBlock

fromBase64, fromHex, parse, prepareDump, toBase64, toBitString, toBytes, toDer, toHex

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Details

serialVersionUID

public static final long serialVersionUID

See Also:

• Constant Field Values

publicKey

protected byte[] publicKey

privateKey

protected byte[] privateKey

Constructor Details

AsymmetricKey

public AsymmetricKey(byte[] b)
              throws IOException

Creates an asymmetric key based on the byte sequence.

Parameters:

b - the byte array containing the key.

Throws:

IOException - if an error occures during parsing

AsymmetricKey

public AsymmetricKey(AsymmetricKey ak)

Copy Constructor.

This constuctor allows to create a copy of an AsymmetricKey

Parameters:

ak - the key to copy

AsymmetricKey

public AsymmetricKey()
              throws IOException

Creates a new Asymmetric key based on the default values.

Throws:

IOException - if an error happens during generation

AsymmetricKey

public AsymmetricKey(AlgorithmParameter params)
              throws IOException

creates a new asymmetric key based on the parameters given.

If available a precalculated key will be offered.

Parameters:

params - the parameters to be used

Throws:

IOException - if the key can not be generated with the given parameters

AsymmetricKey

public AsymmetricKey(AlgorithmParameter params,
 boolean allowPrecalculated)
              throws IOException

creates a new asymmetric key based on the parameters given.

This call is mainly used by the cache manager to enforce new calculation of a key.

Parameters:

params - the parameters to be used

allowPrecalculated - true if a precalculated key is allowed

Throws:

IOException - if the key can not be generated with the given parameters

Method Details

setCacheFileName

public static String setCacheFileName(String name)

getCacheFileName

public static String getCacheFileName()

parse

protected final void parse(org.bouncycastle.asn1.ASN1Encodable to)
                    throws IOException

Specified by:

parse in class AbstractBlock

Throws:

IOException

hasPrivateKey

public boolean hasPrivateKey()

Checks if the object contains a private key.

Returns:

true if the object contains a private key

dumpValueNotation

public String dumpValueNotation(String prefix)

Generates the ASN1 notation of the object.

Parameters:

prefix - the line prefix to be used (normally "")

Returns:

the string representation of the ASN1 dump

dumpValueNotation

public String dumpValueNotation(String prefix,
 DumpType dumpType)

Generates the ASN1 notation of the object.

Specified by:

dumpValueNotation in interface Block

Parameters:

prefix - the line prefix to be used (normally "")

dumpType - the dump type to be used (normally DumpType.PUBLIC_ONLY)

Returns:

the string representation of the ASN1 dump

toAsn1Object

public org.bouncycastle.asn1.ASN1Object toAsn1Object(DumpType dt)
                                              throws IOException

Dumps the key as ASN1 object.

Specified by:

toAsn1Object in interface Dumpable

Parameters:

dt - the dump type to be used

Returns:

the ASN1 object suitable for encoding

Throws:

IOException - if not encodable

encrypt

public byte[] encrypt(byte[] b)
               throws IOException

Encrypts a byte array using the key contained in this object.

Specified by:

encrypt in class Key

Parameters:

b - the plain text byte array to encrypt

Returns:

the encrypted byte array including padding

Throws:

IOException

decrypt

public byte[] decrypt(byte[] b)
               throws IOException

Decrypts a byte array using the key contained in this object.

Specified by:

decrypt in class Key

Parameters:

b - the encrypted byte array

Returns:

the plain text byte array

Throws:

IOException

sign

public byte[] sign(byte[] b)
            throws IOException

Signs a byte array.

This method uses the default hashing algorithm.

Parameters:

b - the byte array to be signed

Returns:

the signature

Throws:

IOException - if unable to carry out signature

sign

public byte[] sign(byte[] b,
 Algorithm mac)
            throws IOException

Signs a byte array.

Parameters:

b - the byte array to be signed

mac - the hashing algorithm to be used

Returns:

the signature

Throws:

IOException - if unable to carry out signature

verify

public boolean verify(byte[] b,
 byte[] sig)
               throws IOException

Verifies a given signature accourding to the objects public key.

Parameters:

b - the byte array representing the message

sig - the byte array representing the signature

Returns:

true if signature could be verified successfully

Throws:

IOException - if signature processing failed

verify

public boolean verify(byte[] b,
 byte[] sig,
 Algorithm mac)
               throws IOException

Verifies a given signature accourding to the objects public key.

Parameters:

b - the byte array representing the message

sig - the byte array representing the signature

mac - the mac algorithm to verify the signature

Returns:

true if signature could be verified successfully

Throws:

IOException - if signature processing failed

setDequeueProbability

public static double setDequeueProbability(double probability)

Sets the probability of reusing a precalculated key again.

This capability is used to reduce cpu load during tests.

Parameters:

probability - the new probability to be set

Returns:

the previously set probability

getDequeueProbability

public static double getDequeueProbability()

Gets the current probability for dequeing a used key (nolrmally 1.0)

Returns:

the current probability set

setPublicKey

public byte[] setPublicKey(byte[] b)

Sets the public key.

Parameters:

b - the byte array representing the public key

Returns:

the previously set public key

Throws:

NullPointerException - if key was tried to set to null

getPublicKey

public byte[] getPublicKey()

Gets the public key in binary representation.

Returns:

the public key

setPrivateKey

public byte[] setPrivateKey(byte[] b)

Sets the private key of this object.

Parameters:

b - the byte representation of the key to be set.

Returns:

the previously set private key

getPrivateKey

public byte[] getPrivateKey()

Gets the private key of this object.

Returns:

the pyte representation of the private key

getAlgorithm

public Algorithm getAlgorithm()

Gets the algorithm of this key type.

Returns:

the algorithm used for generation

getAlgorithmParameter

public AlgorithmParameter getAlgorithmParameter()

Gets the full algorithm parameters of this key.

Returns:

the algorithm parameters used for generation

getPadding

public Padding getPadding()

Gets the padding used for encryption.

Returns:

the padding which is used for encryption

setPadding

public Padding setPadding(Padding p)

Sets the padding used for encryption.

Parameters:

p - the padding to be set

Returns:

the previously set padding

getKeySize

public int getKeySize()

Gets the size of the key stored in this object.

Returns:

the key size in bits

getBlockSize

public int getBlockSize()

Gets the size of the key stored in this object.

Returns:

the key size in bits

getMode

public Mode getMode()

Gets the mode used for encryption.

Returns:

the mode set used for encryption

setMode

public Mode setMode(Mode m)

Sets the mode used for encryption.

Parameters:

m - the mode to be set

Returns:

the mode previously set

equals

public boolean equals(Object key)

tests two asymmetric keys for equality.

Two keys are considered equal if they contain the same parameters and the same keys (public and private)

Overrides:

equals in class Object

Parameters:

key - the other key

Returns:

true if both keys are considered equivalent

hashCode

public int hashCode()

returns the hashcode of the dump representation.

Overrides:

hashCode in class Object

toString

public String toString()

Gets a textual representation of the objects parameters (without the keys).

Overrides:

toString in class Object

Returns:

the string