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 KeyIV represents a secret key and an IV.

Field Summary

Fields

Modifier and Type	Field and Description
static String	ALGO
static String	ALGO_KEY
static int	GCM_TLEN
static int	IV_LEN
static int	KEY_LEN
static int	KEYMATERIAL_LEN

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[]	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 final String ALGO

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Constant Field Values

ALGO_KEY

public static final String ALGO_KEY

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Constant Field Values

KEY_LEN

public static final int KEY_LEN

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Constant Field Values

IV_LEN

public static final int IV_LEN

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Constant Field Values

GCM_TLEN

public static final int GCM_TLEN

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Constant Field Values

KEYMATERIAL_LEN

public static final int KEYMATERIAL_LEN

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Constant Field Values

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 IV_LEN + keylength. The first IV_LEN bytes are taken as iv, the rest is taken as the symmetric symmetricKey, which must be at least 16 bytes long.

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