de.upb.swtpra05.group03.crypto
Class BobCrypto

java.lang.Object
  de.upb.swtpra05.group03.crypto.Crypto
      de.upb.swtpra05.group03.crypto.BobCrypto

Direct Known Subclasses:

ShuttleCrypto

public class BobCrypto

extends Crypto

crypto class used for the 'bob' role known from DiffieHellman example

Version:

$Revision: 1.3 $

Field Summary

private javax.crypto.KeyAgreement	keyAgree object used for the key agreement
private java.security.KeyPairGenerator	keyPairGen used to generate a public private key pair
private java.security.SecureRandom	random random number generator used for key agreement

Fields inherited from class de.upb.swtpra05.group03.crypto.Crypto

AGREEMENT_ALGORITHM, CIPHER_ALGORITHM, KEY_ALGORITHM, pubKeyFactory, SIGNATURE_ALGORITHM, signer, state, STATE_INIT, STATE_READY, STATE_WAITING, verifyer

Constructor Summary

BobCrypto()
Constructor

Method Summary

DataSigPair	generatePublicKey(DataSigPair dsp) generates a public key for the key agreement by using the others public key and creates the secret key
void	reset() reset the state to INIT so a new key agreement can be made
void	saveSeed() saves the seed of the random number generator into a file

Methods inherited from class de.upb.swtpra05.group03.crypto.Crypto

decryptObject, encryptObject, genPublicKeyFromX509, getSecretKey, isReady, loadSigningKeys, setSecretKey, setSecretKey, sign, verify

Methods inherited from class java.lang.Object

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

Field Detail

keyAgree

private final javax.crypto.KeyAgreement keyAgree

object used for the key agreement

random

private java.security.SecureRandom random

random number generator used for key agreement

keyPairGen

private final java.security.KeyPairGenerator keyPairGen

used to generate a public private key pair

Constructor Detail

BobCrypto

public BobCrypto()
          throws java.security.NoSuchAlgorithmException,
                 javax.crypto.NoSuchPaddingException

Constructor

Throws:

javax.crypto.NoSuchPaddingException

java.security.NoSuchAlgorithmException

Method Detail

generatePublicKey

public DataSigPair generatePublicKey(DataSigPair dsp)
                              throws java.security.SignatureException,
                                     java.security.NoSuchAlgorithmException,
                                     java.security.spec.InvalidKeySpecException,
                                     java.security.InvalidAlgorithmParameterException,
                                     java.security.InvalidKeyException

generates a public key for the key agreement by using the others public key and creates the secret key

Parameters:

dsp - object containing key and signature

Returns:

public key

Throws:

java.security.SignatureException

java.security.NoSuchAlgorithmException

java.security.spec.InvalidKeySpecException

java.security.InvalidAlgorithmParameterException

java.security.InvalidKeyException

saveSeed

public void saveSeed()

saves the seed of the random number generator into a file

reset

public void reset()

Description copied from class: Crypto

reset the state to INIT so a new key agreement can be made

Overrides:

reset in class Crypto