Package rs.baselib.crypto

Class Decrypter

java.lang.Object

rs.baselib.crypto.Decrypter

public class Decrypter
extends Object

The class for decrypting strings.

Author:

ralph

Constructor Summary

Constructors

Constructor	Description
Decrypter(byte[] bytephrase, byte[] salt, int iterationCount)	Constructor from bytephrase, salt and iteration spec.
Decrypter(char[] passPhrase)	Constructor from passphrase.
Decrypter(char[] passPhrase, byte[] salt)	Constructor from passphrase.
Decrypter(String passPhrase)	Constructor from passphrase.
Decrypter(String passPhrase, byte[] salt)	Constructor from passphrase.
Decrypter(String passPhrase, byte[] salt, int iterationCount)	Constructor from passphrase, salt and iteration spec.
Decrypter(Key key, String algorithm)	Constructor from secret key.
Decrypter(Key key, String algorithm, byte[] salt, int iterationCount)	Constructor from secret key.
Decrypter(Key key, String algorithm, AlgorithmParameterSpec paramSpec)	Constructor from secret key.
Decrypter(Cipher dCipher)	Constructor from secret key.

Method Summary

Modifier and Type	Method	Description
byte[]	decrypt(byte[] bytes)	Decrypt a byte array
String	decrypt(String str)	Takes a single string as an argument and returns an decrypted version of that string.
String	getAlgorithm()	Returns the algorithm.
AlgorithmParameterSpec	getAlgorithmParameterSpec()	Returns the algorithmParameterSpec.

Methods inherited from class java.lang.Object

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

Constructor Details

Decrypter

public Decrypter(Cipher dCipher)

Constructor from secret key.

Parameters:

dCipher - the cipher to be used

Decrypter

public Decrypter(Key key,
 String algorithm)
          throws DecryptionException

Constructor from secret key.

Parameters:

key - the secret key to be used

algorithm - algorithm (key's algorithm will be used if NULL)

Throws:

DecryptionException - when decrypting algorithm cannot be generated

Decrypter

public Decrypter(Key key,
 String algorithm,
 AlgorithmParameterSpec paramSpec)
          throws DecryptionException

Constructor from secret key.

Parameters:

key - the secret key to be used

algorithm - algorithm (key's algorithm will be used if NULL)

paramSpec - parameters to the decrypting algorithm (will be generated if NULL)

Throws:

DecryptionException - when decrypting algorithm cannot be generated

Decrypter

public Decrypter(Key key,
 String algorithm,
 byte[] salt,
 int iterationCount)
          throws DecryptionException

Constructor from secret key.

Parameters:

key - the secret key to be used

algorithm - algorithm (key's algorithm will be used if NULL)

salt - salt to be used

iterationCount - number of iterations for decryption

Throws:

DecryptionException - when decrypting algorithm cannot be generated

Decrypter

public Decrypter(byte[] bytephrase,
 byte[] salt,
 int iterationCount)
          throws DecryptionException

Constructor from bytephrase, salt and iteration spec.

Parameters:

bytephrase - bytephrase to be used

salt - salt to be used

iterationCount - number of iterations for decryption

Throws:

DecryptionException - when decrypting algorithm cannot be generated

Decrypter

public Decrypter(char[] passPhrase)
          throws DecryptionException

Constructor from passphrase.

Parameters:

passPhrase - passphrase to be used

Throws:

DecryptionException - when decrypting algorithm cannot be generated

Decrypter

public Decrypter(char[] passPhrase,
 byte[] salt)
          throws DecryptionException

Constructor from passphrase.

Parameters:

passPhrase - passphrase to be used

salt - salt to be used

Throws:

DecryptionException - when decrypting algorithm cannot be generated

Decrypter

public Decrypter(String passPhrase)
          throws DecryptionException

Constructor from passphrase.

Parameters:

passPhrase - passphrase to be used

Throws:

DecryptionException - when decrypting algorithm cannot be generated

Decrypter

public Decrypter(String passPhrase,
 byte[] salt)
          throws DecryptionException

Constructor from passphrase.

Parameters:

passPhrase - passphrase to be used

salt - salt to be used

Throws:

DecryptionException - when decrypting algorithm cannot be generated

Decrypter

public Decrypter(String passPhrase,
 byte[] salt,
 int iterationCount)
          throws DecryptionException

Constructor from passphrase, salt and iteration spec.

Parameters:

passPhrase - passphrase to be used

salt - salt to be used

iterationCount - number of iterations for decryption

Throws:

DecryptionException - when decrypting algorithm cannot be generated

Method Details

getAlgorithm

public String getAlgorithm()

Returns the algorithm.

Returns:

the algorithm

getAlgorithmParameterSpec

public AlgorithmParameterSpec getAlgorithmParameterSpec()

Returns the algorithmParameterSpec.

Returns:

the algorithmParameterSpec

decrypt

public String decrypt(String str)
               throws DecryptionException

Takes a single string as an argument and returns an decrypted version of that string.

Parameters:

str - string to be decrypted

Returns:

string decrypted version of the provided String

Throws:

DecryptionException - when decrypting fails

decrypt

public byte[] decrypt(byte[] bytes)
               throws DecryptionException

Decrypt a byte array

Parameters:

bytes - bytes to be decrypted

Returns:

byte decrypted version of the provided array

Throws:

DecryptionException - when decrypting fails