org.openbase.bco.authentication.lib

Class EncryptionHelper

java.lang.Object

org.openbase.bco.authentication.lib.EncryptionHelper

public class EncryptionHelper
extends Object

A key that is used to encrypt and decrypt tickets during Kerberos authentication

Author:

Sebastian Fast

Constructor Summary

Constructors

Constructor and Description
EncryptionHelper()

Method Summary

Modifier and Type	Method and Description
static byte[]	createCipherBlockChainingVector() Creates an initialized vector used for Cipher Block Chaining.
static <T> T	decrypt(byte[] encryptedObject, byte[] key, Class<T> encryptedClass, boolean symmetric) Decrypts a ByteArray into an Object of type T.
static <T> T	decrypt(com.google.protobuf.ByteString encryptedObject, byte[] key, Class<T> encryptedClass, boolean symmetric) Decrypts a ByteString into an Object of type T.
static <T> T	decryptAsymmetric(com.google.protobuf.ByteString encryptedObject, byte[] key, Class<T> encryptedClass) Decrypt an object using an asymmetric key and directly cast it to type T.
static <T> T	decryptSymmetric(com.google.protobuf.ByteString encryptedObject, byte[] key, Class<T> encryptedClass) Decrypt an object with a symmetric key and directly cast it to type T.
static byte[]	encrypt(Serializable object, byte[] key, boolean symmetric) Encrypts any Object into a ByteString.
static com.google.protobuf.ByteString	encryptAsymmetric(Serializable object, byte[] key) Encrypts any Object into a ByteString using a symmetric key
static com.google.protobuf.ByteString	encryptSymmetric(Serializable object, byte[] key) Encrypts any Object into a ByteString using a symmetric key.
static byte[]	generateKey() Generate a key with given transformation and key length which can then be used for symmetric en- or decryption.
static KeyPair	generateKeyPair() Generate a key pair given transformation and key length which can then be used for asymmetric en- or decryption.
static byte[]	hash(String string) Hashes a string that has to be UTF-8 encoeded symmetrically.

Methods inherited from class java.lang.Object

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

Constructor Detail

EncryptionHelper

public EncryptionHelper()

Method Detail

generateKey

public static byte[] generateKey()

Generate a key with given transformation and key length which can then be used for symmetric en- or decryption.

Returns:

the generated key as a byte array

generateKeyPair

public static KeyPair generateKeyPair()

Generate a key pair given transformation and key length which can then be used for asymmetric en- or decryption.

Returns:

the generated key as a byte array

hash

public static byte[] hash(String string)

Hashes a string that has to be UTF-8 encoeded symmetrically.

Parameters:

string - String to be hashed

Returns:

Returns a byte[] representing the hashed string

encryptSymmetric

public static com.google.protobuf.ByteString encryptSymmetric(Serializable object,
                                                              byte[] key)
                                                       throws IOException

Encrypts any Object into a ByteString using a symmetric key.

Parameters:

object - Object to be encrypted

key - byte[] to encrypt object with

Returns:

Returns encrypted object as ByteString

Throws:

IOException - Any IO error occurring during the serialization and encryption.

encryptAsymmetric

public static com.google.protobuf.ByteString encryptAsymmetric(Serializable object,
                                                               byte[] key)
                                                        throws IOException

Encrypts any Object into a ByteString using a symmetric key

Parameters:

object - Object to be encrypted

key - byte[] to encrypt object with

Returns:

Returns encrypted object as ByteString

Throws:

IOException - Any IO error occurring during the serialization and encryption.

encrypt

public static byte[] encrypt(Serializable object,
                             byte[] key,
                             boolean symmetric)
                      throws IOException

Encrypts any Object into a ByteString.

Parameters:

object - Object to be encrypted

key - byte[] to encrypt object with

symmetric - if the encryption should use a symmetric or asymmetric key

Returns:

Returns encrypted object as ByteString

Throws:

IOException - Any IO error occurring during the serialization and encryption.

decryptSymmetric

public static <T> T decryptSymmetric(com.google.protobuf.ByteString encryptedObject,
                                     byte[] key,
                                     Class<T> encryptedClass)
                              throws IOException,
                                     BadPaddingException

Decrypt an object with a symmetric key and directly cast it to type T.

Type Parameters:

T - the type to which the encrypted object is casted

Parameters:

encryptedObject - the object encrypted as a ByteString

key - the key used to decrypt the object

encryptedClass - the class to which the decrypted object is cast

Returns:

the decrypted object cast as T

Throws:

IOException - if the encrypted data is corrupted

BadPaddingException - if the wrong key is used for decryption

ClassCastException - if the encrypted object can not be cast to T

decryptAsymmetric

public static <T> T decryptAsymmetric(com.google.protobuf.ByteString encryptedObject,
                                      byte[] key,
                                      Class<T> encryptedClass)
                               throws IOException,
                                      BadPaddingException

Decrypt an object using an asymmetric key and directly cast it to type T.

Type Parameters:

T - the type to which the encrypted object is casted

Parameters:

encryptedObject - the object encrypted as a ByteString

key - the key used to decrypt the object

encryptedClass - the class to which the decrypted object is cast

Returns:

the decrypted object cast as T

Throws:

IOException - if the encrypted data is corrupted

BadPaddingException - if the wrong key is used for decryption

ClassCastException - if the encrypted object can not be cast to T

decrypt

public static <T> T decrypt(com.google.protobuf.ByteString encryptedObject,
                            byte[] key,
                            Class<T> encryptedClass,
                            boolean symmetric)
                     throws IOException,
                            BadPaddingException,
                            ClassCastException

Decrypts a ByteString into an Object of type T.

Type Parameters:

T - the type to which the encrypted object is casted

Parameters:

encryptedObject - ByteString to be decrypted

key - byte[] to decrypt the encrypted object with

encryptedClass - the class to which the decrypted object is cast

symmetric - if the key is symmetric or asymmetric

Returns:

Returns decrypted object as Object

Throws:

BadPaddingException - if a wrong key is used

IOException - if corrupted data

ClassCastException - if the encrypted object can not be cast to T

decrypt

public static <T> T decrypt(byte[] encryptedObject,
                            byte[] key,
                            Class<T> encryptedClass,
                            boolean symmetric)
                     throws IOException,
                            BadPaddingException,
                            ClassCastException

Decrypts a ByteArray into an Object of type T.

Type Parameters:

T - the type to which the encrypted object is casted

Parameters:

encryptedObject - ByteString to be decrypted

key - byte[] to decrypt the encrypted object with

encryptedClass - the class to which the decrypted object is cast

symmetric - if the key is symmetric or asymmetric

Returns:

Returns decrypted object as Object

Throws:

BadPaddingException - if a wrong key is used

IOException - if corrupted data

ClassCastException - if the encrypted object can not be cast to T

createCipherBlockChainingVector

public static byte[] createCipherBlockChainingVector()

Creates an initialized vector used for Cipher Block Chaining. Use this same vector for encryption and decryption

Returns:

byteArray of length 16