edu.sdsc.inca.util
Class Crypter

java.lang.Object
  edu.sdsc.inca.util.Crypter

public class Crypter
extends java.lang.Object

The Crypter class provides the ability to de/encrypt strings.

Field Summary

protected javax.crypto.Cipher	decipher
protected javax.crypto.Cipher	encipher

Constructor Summary

Crypter(java.lang.String passphrase, java.lang.String algorithm)
Constructs a Crypter that can de/encrypt strings using a specified passphrase and algorithm.

Method Summary

protected java.lang.String	cryptMatchingSubstrings(java.lang.String s, java.util.regex.Pattern p, boolean decrypt) Returns a specified string with all substrings that match a specified pattern de/encrypted.
java.lang.String	decrypt(java.lang.String s) Returns the decrypted version of a specified string.
java.lang.String	decryptMatchingSubstrings(java.lang.String s, java.util.regex.Pattern p) Returns a specified string with all substrings that match a specified pattern decrypted.
java.lang.String	decryptMatchingSubstrings(java.lang.String s, java.lang.String p) Returns a specified string with all substrings that match a specified pattern decrypted.
java.lang.String	encrypt(java.lang.String s) Returns the encrypted version of a specified string.
java.lang.String	encryptMatchingSubstrings(java.lang.String s, java.util.regex.Pattern p) Returns a specified string with all substrings that match a specified pattern encrypted.
java.lang.String	encryptMatchingSubstrings(java.lang.String s, java.lang.String p) Returns a specified string with all substrings that match a specified pattern encrypted.
javax.crypto.Cipher	getDecipher() Return a cipher that can be used for decryption.
javax.crypto.Cipher	getEncipher() Return a cipher that can be used for encryption.

Methods inherited from class java.lang.Object

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

Field Detail

decipher

protected javax.crypto.Cipher decipher

encipher

protected javax.crypto.Cipher encipher

Constructor Detail

Crypter

public Crypter(java.lang.String passphrase,
               java.lang.String algorithm)
        throws CrypterException

Constructs a Crypter that can de/encrypt strings using a specified passphrase and algorithm. The caller must assure that an installed security provider supports the specified algorithm.

Parameters:

passphrase - the de/encryption passphrase

algorithm - the de/encryption algorithm, e.g., DES

Throws:

CrypterException - if initialization of the ciphers fail

Method Detail

decrypt

public java.lang.String decrypt(java.lang.String s)
                         throws CrypterException

Returns the decrypted version of a specified string.

Parameters:

s - the string to decrypt

Returns:

the decrypted equivalent of the string

Throws:

CrypterException - on error

decryptMatchingSubstrings

public java.lang.String decryptMatchingSubstrings(java.lang.String s,
                                                  java.util.regex.Pattern p)
                                           throws CrypterException

Returns a specified string with all substrings that match a specified pattern decrypted.

Parameters:

s - the string to decrypt

p - the pattern to search for and decrypt in the string

Returns:

the string with matching substrings decrypted

Throws:

CrypterException - on error

decryptMatchingSubstrings

public java.lang.String decryptMatchingSubstrings(java.lang.String s,
                                                  java.lang.String p)
                                           throws CrypterException,
                                                  java.util.regex.PatternSyntaxException

Returns a specified string with all substrings that match a specified pattern decrypted.

Parameters:

s - the string to decrypt

p - the pattern to search for and decrypt in the string

Returns:

the string with matching substrings decrypted

Throws:

CrypterException - on error

java.util.regex.PatternSyntaxException - if the pattern is faulty

encrypt

public java.lang.String encrypt(java.lang.String s)
                         throws CrypterException

Returns the encrypted version of a specified string.

Parameters:

s - the string to encrypt

Returns:

the encrypted equivalent of the string, or null on error

Throws:

CrypterException - on error

encryptMatchingSubstrings

public java.lang.String encryptMatchingSubstrings(java.lang.String s,
                                                  java.util.regex.Pattern p)
                                           throws CrypterException

Returns a specified string with all substrings that match a specified pattern encrypted.

Parameters:

s - the string to encrypt

p - the pattern to search for and encrypt in the string

Returns:

the string with matching substrings encrypted

Throws:

CrypterException

encryptMatchingSubstrings

public java.lang.String encryptMatchingSubstrings(java.lang.String s,
                                                  java.lang.String p)
                                           throws CrypterException,
                                                  java.util.regex.PatternSyntaxException

Returns a specified string with all substrings that match a specified pattern encrypted.

Parameters:

s - the string to encrypt

p - the pattern to search for and encrypt in the string

Returns:

the string with matching substrings encrypted

Throws:

CrypterException - on error

java.util.regex.PatternSyntaxException - if the pattern is faulty

getDecipher

public javax.crypto.Cipher getDecipher()

Return a cipher that can be used for decryption.

Returns:

A cipher object.

getEncipher

public javax.crypto.Cipher getEncipher()

Return a cipher that can be used for encryption.

Returns:

A cipher object.

cryptMatchingSubstrings

protected java.lang.String cryptMatchingSubstrings(java.lang.String s,
                                                   java.util.regex.Pattern p,
                                                   boolean decrypt)
                                            throws CrypterException

Returns a specified string with all substrings that match a specified pattern de/encrypted.

Parameters:

s - the string to encrypt

p - the pattern to search for and de/encrypt in the string

decrypt - whether the method should decrypt or decrypt

Returns:

the string with matching substrings de/encrypted

Throws:

CrypterException - on error