org.spongycastle.crypto.kems

Class ECIESKeyEncapsulation

java.lang.Object

org.spongycastle.crypto.kems.ECIESKeyEncapsulation

All Implemented Interfaces:

KeyEncapsulation

public class ECIESKeyEncapsulation
extends java.lang.Object
implements KeyEncapsulation

The ECIES Key Encapsulation Mechanism (ECIES-KEM) from ISO 18033-2.

Constructor Summary

Constructors

Constructor and Description
ECIESKeyEncapsulation(DerivationFunction kdf, java.security.SecureRandom rnd) Set up the ECIES-KEM.
ECIESKeyEncapsulation(DerivationFunction kdf, java.security.SecureRandom rnd, boolean cofactorMode, boolean oldCofactorMode, boolean singleHashMode) Set up the ECIES-KEM.

Method Summary

Modifier and Type	Method and Description
protected ECMultiplier	createBasePointMultiplier()
CipherParameters	decrypt(byte[] in, int keyLen) Decrypt an encapsulated session key.
CipherParameters	decrypt(byte[] in, int inOff, int inLen, int keyLen) Decrypt an encapsulated session key.
protected KeyParameter	deriveKey(int keyLen, byte[] C, byte[] PEH)
CipherParameters	encrypt(byte[] out, int keyLen) Generate and encapsulate a random session key.
CipherParameters	encrypt(byte[] out, int outOff, int keyLen) Generate and encapsulate a random session key.
void	init(CipherParameters key) Initialise the ECIES-KEM.

Methods inherited from class java.lang.Object

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

Constructor Detail

ECIESKeyEncapsulation

public ECIESKeyEncapsulation(DerivationFunction kdf,
                             java.security.SecureRandom rnd)

Set up the ECIES-KEM.

Parameters:

kdf - the key derivation function to be used.

rnd - the random source for the session key.

ECIESKeyEncapsulation

public ECIESKeyEncapsulation(DerivationFunction kdf,
                             java.security.SecureRandom rnd,
                             boolean cofactorMode,
                             boolean oldCofactorMode,
                             boolean singleHashMode)

Set up the ECIES-KEM.

Parameters:

kdf - the key derivation function to be used.

rnd - the random source for the session key.

cofactorMode - if true use the new cofactor ECDH.

oldCofactorMode - if true use the old cofactor ECDH.

singleHashMode - if true use single hash mode.

Method Detail

init

public void init(CipherParameters key)
          throws java.lang.IllegalArgumentException

Initialise the ECIES-KEM.

Specified by:

init in interface KeyEncapsulation

Parameters:

key - the recipient's public (for encryption) or private (for decryption) key.

Throws:

java.lang.IllegalArgumentException

encrypt

public CipherParameters encrypt(byte[] out,
                                int outOff,
                                int keyLen)
                         throws java.lang.IllegalArgumentException

Generate and encapsulate a random session key.

Specified by:

encrypt in interface KeyEncapsulation

Parameters:

out - the output buffer for the encapsulated key.

outOff - the offset for the output buffer.

keyLen - the length of the session key.

Returns:

the random session key.

Throws:

java.lang.IllegalArgumentException

encrypt

public CipherParameters encrypt(byte[] out,
                                int keyLen)

Generate and encapsulate a random session key.

Parameters:

out - the output buffer for the encapsulated key.

keyLen - the length of the session key.

Returns:

the random session key.

decrypt

public CipherParameters decrypt(byte[] in,
                                int inOff,
                                int inLen,
                                int keyLen)
                         throws java.lang.IllegalArgumentException

Decrypt an encapsulated session key.

Specified by:

decrypt in interface KeyEncapsulation

Parameters:

in - the input buffer for the encapsulated key.

inOff - the offset for the input buffer.

inLen - the length of the encapsulated key.

keyLen - the length of the session key.

Returns:

the session key.

Throws:

java.lang.IllegalArgumentException

decrypt

public CipherParameters decrypt(byte[] in,
                                int keyLen)

Decrypt an encapsulated session key.

Parameters:

in - the input buffer for the encapsulated key.

keyLen - the length of the session key.

Returns:

the session key.

createBasePointMultiplier

protected ECMultiplier createBasePointMultiplier()

deriveKey

protected KeyParameter deriveKey(int keyLen,
                                 byte[] C,
                                 byte[] PEH)