org.bouncycastle.crypto.kems
Class SM9KEMExtractor

java.lang.Object
  org.bouncycastle.crypto.kems.SM9KEMExtractor

All Implemented Interfaces:

EncapsulatedSecretExtractor

public class SM9KEMExtractor

extends java.lang.Object

implements EncapsulatedSecretExtractor

SM9 key encapsulation mechanism - decapsulation side (GM/T 0044.4-2016, clause 6). Recovers the shared key K from the encapsulation C using the user's private key de: w' = e(C, de), K = KDF(C || w' || ID, klen).

Constructor Summary

SM9KEMExtractor(SM9EncPrivateKeyParameters key, int keyLenBits)

Method Summary

byte[]	extractSecret(byte[] encapsulation) Extract the secret based on the recipient private key.
int	getEncapsulationLength() Return the length in bytes of the encapsulation.

Methods inherited from class java.lang.Object

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

Constructor Detail

SM9KEMExtractor

public SM9KEMExtractor(SM9EncPrivateKeyParameters key,
                       int keyLenBits)

Method Detail

extractSecret

public byte[] extractSecret(byte[] encapsulation)

Description copied from interface: EncapsulatedSecretExtractor

Extract the secret based on the recipient private key.

Specified by:

extractSecret in interface EncapsulatedSecretExtractor

Parameters:

encapsulation - the encapsulated secret.

getEncapsulationLength

public int getEncapsulationLength()

Description copied from interface: EncapsulatedSecretExtractor

Return the length in bytes of the encapsulation.

Specified by:

getEncapsulationLength in interface EncapsulatedSecretExtractor

Returns:

length in bytes of an encapsulation for this parameter set.