rice.p2p.util
Class SecurityUtils

java.lang.Object
  rice.p2p.util.SecurityUtils

public class SecurityUtils

extends java.lang.Object

This class contains a large number of static methods for performing security-related primitives, such as encrypt, decrypt, etc...

Version:

$Id: SecurityUtils.java,v 1.6 2005/05/16 17:48:11 amislove Exp $

Author:

amislove

Field Summary

static java.lang.String	APOP_ALGORITHM The name of the apop function.
static java.lang.String	ASYMMETRIC_ALGORITHM The name of the asymmetric cipher to use.
static java.lang.String	ASYMMETRIC_GENERATOR The name of the asymmetric generator to use.
static java.lang.String	DEPRECATED_ASYMMETRIC_ALGORITHM DESCRIBE THE FIELD
static java.lang.String	HASH_ALGORITHM The name of the hash function.
static java.lang.String	HMAC_ALGORITHM The name of the hmac function.
static byte[]	HMAC_IPAD The ipad byte array for use in hmac
static byte	HMAC_IPAD_BYTE The ipad of hmac keys, as defined in RFC 2195
static int	HMAC_KEY_LENGTH The length of hmac keys
static byte[]	HMAC_OPAD The opad byte array for use in hmac
static byte	HMAC_OPAD_BYTE The opad of hmac keys, as defined in RFC 2195
static java.lang.String	SIGNATURE_ALGORITHM The name of the signature algorithm to use.
static java.lang.String	SYMMETRIC_ALGORITHM The name of the symmetric cipher to use.
static java.lang.String	SYMMETRIC_GENERATOR The name of the symmetric cipher to use.
static int	SYMMETRIC_KEY_LENGTH The length of the symmetric keys

Method Summary

static byte[]	apop(byte[] challenge, byte[] password) Utility method for determining the apop of a challenge and password using a secure hashing algorithm.
static byte[]	decryptAsymmetric(byte[] data, java.security.PrivateKey key) Decrypts the given byte[] using the provided private key.
static byte[]	decryptSymmetric(byte[] data, byte[] key) Utility method for decrypting some data with symmetric encryption.
static java.lang.Object	deserialize(byte[] data) Utility method for deserializing an object from a byte[]
static byte[]	encryptAsymmetric(byte[] data, java.security.PublicKey key) Encrypts the given byte[] using the provided public key.
static byte[]	encryptSymmetric(byte[] data, byte[] key) Utility method for encrypting a block of data with symmetric encryption.
static byte[]	encryptSymmetric(byte[] data, byte[] key, int offset, int length) Utility method for encrypting a block of data with symmetric encryption.
static java.security.KeyPair	generateKeyAsymmetric() Utility method which will generate a non-weak DES key for applications to use.
static byte[]	generateKeySymmetric() Utility method which will generate a non-weak DES key for applications to use.
static byte[]	hash(byte[] input) Utility method for determining the hash of a byte[] using a secure hashing algorithm.
static byte[]	hmac(byte[] key, byte[] text) Utility method for determining the hmac of a byte[] and key using a secure hashing algorithm.
static byte[]	serialize(java.lang.Object o) Utility method for serializing an object to a byte[].
static byte[]	sign(byte[] data, java.security.PrivateKey key) Utility method for signing a block of data with the a private key
static boolean	verify(byte[] data, byte[] sig, java.security.PublicKey key) Utility method for verifying a signature

Methods inherited from class java.lang.Object

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

Field Detail

ASYMMETRIC_ALGORITHM

public static final java.lang.String ASYMMETRIC_ALGORITHM

The name of the asymmetric cipher to use.

See Also:

Constant Field Values

DEPRECATED_ASYMMETRIC_ALGORITHM

public static final java.lang.String DEPRECATED_ASYMMETRIC_ALGORITHM

DESCRIBE THE FIELD

See Also:

Constant Field Values

SYMMETRIC_ALGORITHM

public static final java.lang.String SYMMETRIC_ALGORITHM

The name of the symmetric cipher to use.

See Also:

Constant Field Values

ASYMMETRIC_GENERATOR

public static final java.lang.String ASYMMETRIC_GENERATOR

The name of the asymmetric generator to use.

See Also:

Constant Field Values

SYMMETRIC_GENERATOR

public static final java.lang.String SYMMETRIC_GENERATOR

The name of the symmetric cipher to use.

See Also:

Constant Field Values

SIGNATURE_ALGORITHM

public static final java.lang.String SIGNATURE_ALGORITHM

The name of the signature algorithm to use.

See Also:

Constant Field Values

SYMMETRIC_KEY_LENGTH

public static final int SYMMETRIC_KEY_LENGTH

The length of the symmetric keys

See Also:

Constant Field Values

HASH_ALGORITHM

public static final java.lang.String HASH_ALGORITHM

The name of the hash function.

See Also:

Constant Field Values

HMAC_ALGORITHM

public static final java.lang.String HMAC_ALGORITHM

The name of the hmac function.

See Also:

Constant Field Values

APOP_ALGORITHM

public static final java.lang.String APOP_ALGORITHM

The name of the apop function.

See Also:

Constant Field Values

HMAC_KEY_LENGTH

public static final int HMAC_KEY_LENGTH

The length of hmac keys

See Also:

Constant Field Values

HMAC_IPAD_BYTE

public static final byte HMAC_IPAD_BYTE

The ipad of hmac keys, as defined in RFC 2195

See Also:

Constant Field Values

HMAC_OPAD_BYTE

public static final byte HMAC_OPAD_BYTE

The opad of hmac keys, as defined in RFC 2195

See Also:

Constant Field Values

HMAC_IPAD

public static final byte[] HMAC_IPAD

The ipad byte array for use in hmac

HMAC_OPAD

public static final byte[] HMAC_OPAD

The opad byte array for use in hmac

Method Detail

serialize

public static byte[] serialize(java.lang.Object o)
                        throws java.io.IOException

Utility method for serializing an object to a byte[].

Parameters:

o - The object to serialize

Returns:

The byte[] of the object

Throws:

java.io.IOException - If serialization does not happen properly

deserialize

public static java.lang.Object deserialize(byte[] data)
                                    throws java.io.IOException,
                                           java.lang.ClassNotFoundException

Utility method for deserializing an object from a byte[]

Parameters:

data - The data to deserialize

Returns:

The object

Throws:

java.io.IOException - If deserialization does not happen properly

java.lang.ClassNotFoundException - If the deserialized class is not found

hash

public static byte[] hash(byte[] input)
                   throws java.lang.SecurityException

Utility method for determining the hash of a byte[] using a secure hashing algorithm.

Parameters:

input - The input

Returns:

The hash value

Throws:

java.lang.SecurityException - If the hashing does not happen properly

apop

public static byte[] apop(byte[] challenge,
                          byte[] password)
                   throws java.lang.SecurityException

Utility method for determining the apop of a challenge and password using a secure hashing algorithm.

Parameters:

password - The password

challenge - The challengr

Returns:

The hash value

Throws:

java.lang.SecurityException - If the hashing does not happen properly

hmac

public static byte[] hmac(byte[] key,
                          byte[] text)
                   throws java.lang.SecurityException

Utility method for determining the hmac of a byte[] and key using a secure hashing algorithm.

Parameters:

text - The text

key - The key

Returns:

The hmac value

Throws:

java.lang.SecurityException - If the hmacing does not happen properly

encryptSymmetric

public static byte[] encryptSymmetric(byte[] data,
                                      byte[] key)
                               throws java.lang.SecurityException

Utility method for encrypting a block of data with symmetric encryption.

Parameters:

data - The data

key - The key

Returns:

The ciphertext

Throws:

java.lang.SecurityException - If the encryption does not happen properly

encryptSymmetric

public static byte[] encryptSymmetric(byte[] data,
                                      byte[] key,
                                      int offset,
                                      int length)
                               throws java.lang.SecurityException

Utility method for encrypting a block of data with symmetric encryption.

Parameters:

data - The data

key - The key

offset - The offset into the data

length - The length of data to write

Returns:

The ciphertext

Throws:

java.lang.SecurityException - If the encryption does not happen properly

decryptSymmetric

public static byte[] decryptSymmetric(byte[] data,
                                      byte[] key)
                               throws java.lang.SecurityException

Utility method for decrypting some data with symmetric encryption.

Parameters:

data - The data to decrypt

key - The key

Returns:

The decrypted data

Throws:

java.lang.SecurityException - If the decryption does not happen properly

sign

public static byte[] sign(byte[] data,
                          java.security.PrivateKey key)
                   throws java.lang.SecurityException

Utility method for signing a block of data with the a private key

Parameters:

data - The data

key - The key to use to sign

Returns:

The signature

Throws:

java.lang.SecurityException - If the signing does not happen properly

verify

public static boolean verify(byte[] data,
                             byte[] sig,
                             java.security.PublicKey key)
                      throws java.lang.SecurityException

Utility method for verifying a signature

Parameters:

data - The data to verify

sig - The proposed signature

key - The key to verify against

Returns:

Whether or not the sig matches.

Throws:

java.lang.SecurityException - If the verification does not happen properly

encryptAsymmetric

public static byte[] encryptAsymmetric(byte[] data,
                                       java.security.PublicKey key)
                                throws java.lang.SecurityException

Encrypts the given byte[] using the provided public key. TO DO: Check length of input

Parameters:

data - The data to encrypt

key - The key to encrypt with

Returns:

The encrypted data

Throws:

java.lang.SecurityException - If the encryption does not happen properly

decryptAsymmetric

public static byte[] decryptAsymmetric(byte[] data,
                                       java.security.PrivateKey key)
                                throws java.lang.SecurityException

Decrypts the given byte[] using the provided private key. TO DO: Check length of input

Parameters:

data - The data to decrypt

key - The private key to use

Returns:

The decrypted data

Throws:

java.lang.SecurityException - If the decryption does not happen properly

generateKeySymmetric

public static byte[] generateKeySymmetric()

Utility method which will generate a non-weak DES key for applications to use.

Returns:

A new, random DES key

generateKeyAsymmetric

public static java.security.KeyPair generateKeyAsymmetric()

Utility method which will generate a non-weak DES key for applications to use.

Returns:

A new, random DES key