ch.epfl.dedis.calypso

Class Encryption

java.lang.Object

ch.epfl.dedis.calypso.Encryption

public class Encryption
extends Object

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	Encryption.keyIv

Field Summary

Fields

Modifier and Type	Field and Description
static String	algo
static String	algoKey
static int	ivLength

Constructor Summary

Constructors

Constructor and Description
Encryption()

Method Summary

Modifier and Type	Method and Description
static byte[]	decryptData(byte[] dataEnc, byte[] keyMaterial) This method decrypts the data using the same encryption-method as is defined in the header of this class.
static byte[]	decryptData(com.google.protobuf.ByteString dataEnc, byte[] keyMaterial) Convenience method for use with googles-protobuf bytestring.
static byte[]	encryptData(byte[] data, byte[] keyMaterial) Encrypts the data using the encryption defined in the header.

Methods inherited from class java.lang.Object

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

Field Detail

algo

public static String algo

algoKey

public static String algoKey

ivLength

public static int ivLength

Constructor Detail

Encryption

public Encryption()

Method Detail

encryptData

public static byte[] encryptData(byte[] data,
                                 byte[] keyMaterial)
                          throws CothorityCryptoException

Encrypts the data using the encryption defined in the header.

Parameters:

data - the data to encrypt

keyMaterial - random string of length ivLength + keylength. The first ivLength bytes are taken as iv, the rest is taken as the symmetric symmetricKey.

Returns:

a combined

Throws:

CothorityCryptoException - if there's a problem with the cryptography

decryptData

public static byte[] decryptData(byte[] dataEnc,
                                 byte[] keyMaterial)
                          throws CothorityCryptoException

This method decrypts the data using the same encryption-method as is defined in the header of this class.

Parameters:

dataEnc - the encrypted data from the skipchain

keyMaterial - the decrypted keyMaterial

Returns:

decrypted data

Throws:

CothorityCryptoException - if there's a problem with the cryptography

decryptData

public static byte[] decryptData(com.google.protobuf.ByteString dataEnc,
                                 byte[] keyMaterial)
                          throws CothorityCryptoException

Convenience method for use with googles-protobuf bytestring.

Parameters:

dataEnc - as google protobuf bytestring

keyMaterial - the decrypted keyMaterial

Returns:

decypted data

Throws:

CothorityCryptoException - if there's a problem with the cryptography