com.vodafone360.people.engine.login
Class RSAEncryptionUtils

java.lang.Object
  com.vodafone360.people.engine.login.RSAEncryptionUtils

public class RSAEncryptionUtils
extends java.lang.Object

Utility class for encrypting/decrypting login and registration user credentials.

Field Summary

private static byte[]	DEFAULT_PUBKEY_EXPONENTIAL Exponential part of the public key.
private static byte[]	DEFAULT_PUBKEY_MODULO Default public key which can be used to encrypt data.
private static int	ROUND_UP_VALUE Ensures data length is always a multiple of 16 (by rounding up if necessary).

Constructor Summary

RSAEncryptionUtils()

Method Summary

static void	copyDefaultPublicKey(PublicKeyDetails key) Copies the default key into the given parameter.
protected static byte[]	encryptRSA(RSAKeyParameters pubKey, java.lang.String data) Encrypts bytes with the given RSA Public Key.
protected static RSAKeyParameters	getDefaultPublicKey() Fetches the default public key.
protected static RSAKeyParameters	getRSAPubKey(byte[] mod, byte[] exp) Composes a RSA Public Key from its components.
private static int	roundUp(int v, int t) Return the value of v rounded up to a multiple of t
private static byte[]	rsa(boolean encrypt, RSAKeyParameters key, byte[] data) Encrypts or Decrypts bytes with the given RSA Public or Private Key.
private static byte[]	trimZeros(byte[] data) Removes all the zeros from the end of the given array.

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_PUBKEY_MODULO

private static final byte[] DEFAULT_PUBKEY_MODULO

Default public key which can be used to encrypt data. The server has the suitable private key for decrypting the data. This is the modulo part.

DEFAULT_PUBKEY_EXPONENTIAL

private static final byte[] DEFAULT_PUBKEY_EXPONENTIAL

Exponential part of the public key.

ROUND_UP_VALUE

private static final int ROUND_UP_VALUE

Ensures data length is always a multiple of 16 (by rounding up if necessary).

See Also:

Constant Field Values

Constructor Detail

RSAEncryptionUtils

public RSAEncryptionUtils()

Method Detail

getDefaultPublicKey

protected static RSAKeyParameters getDefaultPublicKey()

Fetches the default public key.

Returns:

Public key

copyDefaultPublicKey

public static void copyDefaultPublicKey(PublicKeyDetails key)

Copies the default key into the given parameter.

Parameters:

key - Where the key should be copied.

getRSAPubKey

protected static RSAKeyParameters getRSAPubKey(byte[] mod,
                                               byte[] exp)

Composes a RSA Public Key from its components.

Parameters:

mod - the RSA modulo.

exp - the RSA exponent.

Returns:

the RSA public key.

encryptRSA

protected static byte[] encryptRSA(RSAKeyParameters pubKey,
                                   java.lang.String data)
                            throws InvalidCipherTextException

Encrypts bytes with the given RSA Public Key.

Parameters:

pubKey - the RSA Public Key.

data - the data to encrypt.

Returns:

the encrypted data.

Throws:

java.security.InvalidParameterException

InvalidCipherTextException

rsa

private static byte[] rsa(boolean encrypt,
                          RSAKeyParameters key,
                          byte[] data)
                   throws InvalidCipherTextException

Encrypts or Decrypts bytes with the given RSA Public or Private Key.

Parameters:

encrypt - true for encrypt, false for decrypt.

key - the RSA Public or Private Key.

data - the data to encrypt or decrypt.

Returns:

the encrypted or decrypted data.

Throws:

InvalidCipherTextException

roundUp

private static int roundUp(int v,
                           int t)

Return the value of v rounded up to a multiple of t

Parameters:

v - The value to round up

t - The multiple to use

Returns:

The rounded result

trimZeros

private static byte[] trimZeros(byte[] data)

Removes all the zeros from the end of the given array.

Parameters:

data - Initial array to trim

Returns:

New array which n less elements (where n = number of trailing zeros). If the given array is all zeros then the function will fail and the result will be the initial array (NULL if initial array is NULL)