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package org.cosmopol.crypto;
import java.io.EOFException;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.Provider;
import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.ShortBufferException;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.BadPaddingException;
/**
* This class provides methods to generate keys, crypt or decrypt stream and
* files with a symetric-key algorithm such as the AES, DES and so on.
* @author Absil Romain
*/
public class SymetricEncryptor extends CipherEncryptor
{
private SecretKey key;
private String algorithm;
/**
* The constant for the AES symetric-key algorithm.
**/
public static String AES = "AES";
/**
* The constant for the DES symetric-key algorithm.
**/
public static String DES = "DES";
/**
* The constant for the triple DES (DES-EDE) symetric-key algorithm.
**/
public static String DES_EDE = "DESede";
/**
* The constant for the Blowfish symetric-key algorithm.
**/
public static String BLOWFISH = "Blowfish";
/**
* The constant for the RC2 symetric-key algorithm.
**/
public static String RC2 = "RC2";
/**
* The constant for the Arcfour symetric-key algorithm.
**/
public static String ARCFOUR = "RC4";
/**
* Constructs a new symetric encryptor with the specified key.<br>
* @param key the secret key to crypt or decrypt datas.
**/
public SymetricEncryptor(SecretKey key)
{
this.key = key;
this.algorithm = key.getAlgorithm();
}
/**
* Constructs a new symetric encryptor with the specified key file name
* containing the secret key.
* @param keyFileName the name of the file containing the secret key.
* @throws java.io.FileNotFoundException if the file containing the secret
* key doesn't exist.
* @throws java.io.IOException if an I/O error occurs during reading the
* key.
* @throws java.lang.ClassNotFoundException if the class of the key is
* unknown.
**/
public SymetricEncryptor(String keyFileName)
throws FileNotFoundException, IOException, ClassNotFoundException
{
ObjectInputStream in = new ObjectInputStream(new FileInputStream(keyFileName));
this.key = (SecretKey)in.readObject();
this.algorithm = key.getAlgorithm();
in.close();
}
/**
* Constructs a new symetric encryptor with the specified key file
* containing the secret key.
* @param keyFile the file containing the secret key.
* @throws java.io.FileNotFoundException if the file containing the secret
* key doesn't exist.
* @throws java.io.IOException if an I/O error occurs during reading the
* key.
* @throws java.lang.ClassNotFoundException if the class of the key is
* unknown.
*/
public SymetricEncryptor(File keyFile)
throws FileNotFoundException, IOException, ClassNotFoundException
{
ObjectInputStream in = new ObjectInputStream(new FileInputStream(keyFile));
this.key = (SecretKey)in.readObject();
this.algorithm = key.getAlgorithm();
in.close();
}
/**
* Returns the secret key of the underlying symetric encryptor.
* @return the secret key of the underlying symetric encryptor.
**/
public SecretKey getSecretKey()
{
return this.key;
}
/**
* Returns the algorithm's name of the underlying symetric encryptor.
* @return the algorithm's name of the underlying symetric encryptor.
**/
public String getAlgorithm()
{
return this.algorithm;
}
/**
* Returns a new instance of SymetricEncryptor generated with the specified
* algorithm.
* @param algorithm the algorithm of the symetric encryptor you want to be
* returned.
* @return a new instance of SymetricEncryptor generated with the specified
* algorithm.
* @see org.umh.crypto.SymetricEncryptor#AES
* @see org.umh.crypto.SymetricEncryptor#DES
* @see org.umh.crypto.SymetricEncryptor#DES_EDE
* @see org.umh.crypto.SymetricEncryptor#BLOWFISH
* @see org.umh.crypto.SymetricEncryptor#RC2
* @see org.umh.crypto.SymetricEncryptor#ARCFOUR
* @throws java.security.NoSuchAlgorithmException if the given algorithm
* is invalid.
*/
public static SymetricEncryptor getInstance(String algorithm)
throws NoSuchAlgorithmException
{
return new SymetricEncryptor(generateKey(algorithm));
}
/**
* Returns a new instance of SymetricEncryptor generated with the specified
* algorithm and provider name.
* @param algorithm the algorithm of the symetric encryptor you want to be
* returned.
* @param provider the provider's name of the algorithm of the symetric
* encryptor you want to be returned.
* @return a new instance of SymetricEncryptor generated with the specified
* algorithm.
* @see org.umh.crypto.SymetricEncryptor#AES
* @see org.umh.crypto.SymetricEncryptor#DES
* @see org.umh.crypto.SymetricEncryptor#DES_EDE
* @see org.umh.crypto.SymetricEncryptor#BLOWFISH
* @see org.umh.crypto.SymetricEncryptor#RC2
* @see org.umh.crypto.SymetricEncryptor#ARCFOUR
* @throws java.security.NoSuchAlgorithmException if the given algorithm
* is invalid.
* @throws java.security.NoSuchProviderException if the given provider
* is invalid.
*/
public static SymetricEncryptor getInstance(String algorithm, String provider)
throws NoSuchAlgorithmException, NoSuchProviderException
{
return new SymetricEncryptor(generateKey(algorithm, provider));
}
/**
* Returns a new instance of SymetricEncryptor generated with the specified
* algorithm and provider.
* @param algorithm the algorithm of the symetric encryptor you want to be
* returned.
* @param provider the provider of the algorithm of the symetric
* encryptor you want to be returned.
* @return a new instance of SymetricEncryptor generated with the specified
* algorithm.
* @see org.umh.crypto.SymetricEncryptor#AES
* @see org.umh.crypto.SymetricEncryptor#DES
* @see org.umh.crypto.SymetricEncryptor#DES_EDE
* @see org.umh.crypto.SymetricEncryptor#BLOWFISH
* @see org.umh.crypto.SymetricEncryptor#RC2
* @see org.umh.crypto.SymetricEncryptor#ARCFOUR
* @throws java.security.NoSuchAlgorithmException if the given algorithm
* is invalid.
*/
public static SymetricEncryptor getInstance(String algorithm, Provider provider)
throws NoSuchAlgorithmException
{
return new SymetricEncryptor(generateKey(algorithm, provider));
}
/**
* Returns a secret key generated with the specified algorithm.
* @param algorithm the algorithm of the symetric secret key you want to be
* returned.
* @return a secret key generated with the specified algorithm.
* @see org.umh.crypto.SymetricEncryptor#AES
* @see org.umh.crypto.SymetricEncryptor#DES
* @see org.umh.crypto.SymetricEncryptor#DES_EDE
* @see org.umh.crypto.SymetricEncryptor#BLOWFISH
* @see org.umh.crypto.SymetricEncryptor#RC2
* @see org.umh.crypto.SymetricEncryptor#ARCFOUR
* @throws java.security.NoSuchAlgorithmException if the given algorithm
* is invalid.
*/
public static SecretKey generateKey(String algorithm)
throws NoSuchAlgorithmException
{
KeyGenerator keygen = KeyGenerator.getInstance(algorithm);
SecureRandom random = new SecureRandom();
keygen.init(random);
SecretKey key = keygen.generateKey();
return key;
}
/**
* Returns a secret key generated with the specified algorithm and provider
* name.
* @param algorithm the algorithm of the symetric secret key you want to be
* returned.
* @param provider the provider's name of the algorithm of the symetric
* secret key you want to be returned.
* @return a secret key generated with the specified algorithm and provider
* name.
* @see org.umh.crypto.SymetricEncryptor#AES
* @see org.umh.crypto.SymetricEncryptor#DES
* @see org.umh.crypto.SymetricEncryptor#DES_EDE
* @see org.umh.crypto.SymetricEncryptor#BLOWFISH
* @see org.umh.crypto.SymetricEncryptor#RC2
* @see org.umh.crypto.SymetricEncryptor#ARCFOUR
* @throws java.security.NoSuchAlgorithmException if the given algorithm
* is invalid.
* @throws java.security.NoSuchProviderException if the given provider
* is invalid.
*/
public static SecretKey generateKey(String algorithm, String provider)
throws NoSuchAlgorithmException, NoSuchProviderException
{
KeyGenerator keygen = KeyGenerator.getInstance(algorithm, provider);
SecureRandom random = new SecureRandom();
keygen.init(random);
SecretKey key = keygen.generateKey();
return key;
}
/**
* Returns a secret key generated with the specified algorithm and provider.
* @param algorithm the algorithm of the symetric secret key you want to be
* returned.
* @param provider the provider of the algorithm of the symetric
* secret key you want to be returned.
* @return a secret key generated with the specified algorithm and provider.
* @see org.umh.crypto.SymetricEncryptor#AES
* @see org.umh.crypto.SymetricEncryptor#DES
* @see org.umh.crypto.SymetricEncryptor#DES_EDE
* @see org.umh.crypto.SymetricEncryptor#BLOWFISH
* @see org.umh.crypto.SymetricEncryptor#RC2
* @see org.umh.crypto.SymetricEncryptor#ARCFOUR
* @throws java.security.NoSuchAlgorithmException if the given algorithm
* is invalid.
*/
public static SecretKey generateKey(String algorithm, Provider provider)
throws NoSuchAlgorithmException
{
KeyGenerator keygen = KeyGenerator.getInstance(algorithm, provider);
SecureRandom random = new SecureRandom();
keygen.init(random);
SecretKey key = keygen.generateKey();
return key;
}
/**
* Writes a secret key generated with the specified algorithm to the
* specified output file.
* @param algorithm the algorithm of the symetric secret key you want to be
* written.
* @param outputFileName the name of the file you want the key to be
* written.
* @see org.umh.crypto.SymetricEncryptor#AES
* @see org.umh.crypto.SymetricEncryptor#DES
* @see org.umh.crypto.SymetricEncryptor#DES_EDE
* @see org.umh.crypto.SymetricEncryptor#BLOWFISH
* @see org.umh.crypto.SymetricEncryptor#RC2
* @see org.umh.crypto.SymetricEncryptor#ARCFOUR
* @throws java.security.NoSuchAlgorithmException if the given algorithm
* is invalid.
* @throws java.io.IOException if an I/O error occurs during writing the
* key.
*/
public static void generateAndSaveKey(String algorithm, String outputFileName)
throws NoSuchAlgorithmException, IOException
{
SecretKey key = generateKey(algorithm);
ObjectOutputStream out = new ObjectOutputStream(
new FileOutputStream(outputFileName));
out.writeObject(key);
out.close();
}
/**
* Writes a secret key generated with the specified algorithm and provider
* to the specified output file.
* @param algorithm the algorithm of the symetric secret key you want to be
* written.
* @param provider the provider's name of the algorithm.
* @param outputFileName the name of the file you want the key to be
* written.
* @see org.umh.crypto.SymetricEncryptor#AES
* @see org.umh.crypto.SymetricEncryptor#DES
* @see org.umh.crypto.SymetricEncryptor#DES_EDE
* @see org.umh.crypto.SymetricEncryptor#BLOWFISH
* @see org.umh.crypto.SymetricEncryptor#RC2
* @see org.umh.crypto.SymetricEncryptor#ARCFOUR
* @throws java.security.NoSuchAlgorithmException if the given algorithm
* is invalid.
* @throws java.security.NoSuchProviderException if the given provider
* is invalid.
* @throws java.io.IOException if an I/O error occurs during writing the
* key.
*/
public static void generateAndSaveKey(String algorithm, String provider,
String outputFileName)
throws NoSuchAlgorithmException, NoSuchProviderException, IOException
{
SecretKey key = generateKey(algorithm, provider);
ObjectOutputStream out = new ObjectOutputStream(
new FileOutputStream(outputFileName));
out.writeObject(key);
out.close();
}
/**
* Writes a secret key generated with the specified algorithm and provider
* to the specified output file.
* @param algorithm the algorithm of the symetric secret key you want to be
* written.
* @param provider the provider's name of the algorithm.
* @param outputFileName the name of the file you want the key to be
* written.
* @see org.umh.crypto.SymetricEncryptor#AES
* @see org.umh.crypto.SymetricEncryptor#DES
* @see org.umh.crypto.SymetricEncryptor#DES_EDE
* @see org.umh.crypto.SymetricEncryptor#BLOWFISH
* @see org.umh.crypto.SymetricEncryptor#RC2
* @see org.umh.crypto.SymetricEncryptor#ARCFOUR
* @throws java.security.NoSuchAlgorithmException if the given algorithm
* is invalid.
* @throws java.io.IOException if an I/O error occurs during writing the
* key.
*/
public static void generateAndSaveKey(String algorithm, Provider provider,
String outputFileName)
throws NoSuchAlgorithmException, IOException
{
SecretKey key = generateKey(algorithm, provider);
ObjectOutputStream out = new ObjectOutputStream(
new FileOutputStream(outputFileName));
out.writeObject(key);
out.close();
}
/**
* Writes a secret key generated with the specified algorithm to the
* specified output file.
* @param algorithm the algorithm of the symetric secret key you want to be
* written.
* @param outputFile the file you want the key to be written.
* @see org.umh.crypto.SymetricEncryptor#AES
* @see org.umh.crypto.SymetricEncryptor#DES
* @see org.umh.crypto.SymetricEncryptor#DES_EDE
* @see org.umh.crypto.SymetricEncryptor#BLOWFISH
* @see org.umh.crypto.SymetricEncryptor#RC2
* @see org.umh.crypto.SymetricEncryptor#ARCFOUR
* @throws java.security.NoSuchAlgorithmException if the given algorithm
* is invalid.
* @throws java.io.IOException if an I/O error occurs during writing the
* key.
*/
public static void generateAndSaveKey(String algorithm, File outputFile)
throws NoSuchAlgorithmException, IOException
{
SecretKey key = generateKey(algorithm);
ObjectOutputStream out = new ObjectOutputStream(
new FileOutputStream(outputFile));
out.writeObject(key);
out.close();
}
/**
* Writes a secret key generated with the specified algorithm and provider
* to the specified output file.
* @see org.umh.crypto.SymetricEncryptor#AES
* @see org.umh.crypto.SymetricEncryptor#DES
* @see org.umh.crypto.SymetricEncryptor#DES_EDE
* @see org.umh.crypto.SymetricEncryptor#BLOWFISH
* @see org.umh.crypto.SymetricEncryptor#RC2
* @see org.umh.crypto.SymetricEncryptor#ARCFOUR
* @param algorithm the algorithm of the symetric secret key you want to be
* written.
* @param provider the provider's name of the algorithm.
* @param outputFile the file you want the key to be written.
* @throws java.security.NoSuchProviderException if the given provider is invalid.
* @throws java.security.NoSuchAlgorithmException if the given algorithm is invalid.
* @throws java.io.IOException if an I/O error occurs during writing the
* key.
*/
public static void generateAndSaveKey(String algorithm, String provider, File outputFile)
throws NoSuchAlgorithmException, NoSuchProviderException, IOException
{
SecretKey key = generateKey(algorithm, provider);
ObjectOutputStream out = new ObjectOutputStream(
new FileOutputStream(outputFile));
out.writeObject(key);
out.close();
}
/**
* Writes a secret key generated with the specified algorithm and provider
* to the specified output file.
* @param algorithm the algorithm of the symetric secret key you want to be
* written.
* @param provider the provider's name of the algorithm.
* @param outputFile the file you want the key to be written.
* @see org.umh.crypto.SymetricEncryptor#AES
* @see org.umh.crypto.SymetricEncryptor#DES
* @see org.umh.crypto.SymetricEncryptor#DES_EDE
* @see org.umh.crypto.SymetricEncryptor#BLOWFISH
* @see org.umh.crypto.SymetricEncryptor#RC2
* @see org.umh.crypto.SymetricEncryptor#ARCFOUR
* @throws java.security.NoSuchAlgorithmException if the given algorithm
* is invalid.
* @throws java.io.IOException if an I/O error occurs during writing the
* key.
*/
public static void generateAndSaveKey(String algorithm, Provider provider, File outputFile)
throws NoSuchAlgorithmException, IOException
{
SecretKey key = generateKey(algorithm, provider);
ObjectOutputStream out = new ObjectOutputStream(
new FileOutputStream(outputFile));
out.writeObject(key);
out.close();
}
/**
* Encrypts the specified input file to the specified output file with the
* underlying symetric encryptor.
* @param inputFileName the name of the file you want to be encrypted.
* @param outputFileName the name of the file where you want the encrypted
* datas to be written.
* @throws FileNotFoundException if the input file doesn't exists.
* @throws IOException if an I/O error occurs during reading the input file
* or writting the encrypted datas to the output file.
* @throws InvalidKeyException if the key of the underlying symetric
* encryptor is not a valid key for this operation.
* @throws NoSuchPaddingException if the algorithm contains a padding
* scheme that is not available.
**/
public void encryptFile(String inputFileName, String outputFileName)
throws FileNotFoundException, IOException, InvalidKeyException,
NoSuchPaddingException
{
InputStream in = new FileInputStream(inputFileName);
OutputStream out = new FileOutputStream(outputFileName);
Cipher cipher = null;
try
{
cipher = Cipher.getInstance(algorithm);
}
catch(NoSuchAlgorithmException ex)//never launched
{
ex.printStackTrace();
}
cipher.init(Cipher.ENCRYPT_MODE, key);
super.crypt(in, out, cipher);
in.close();
out.close();
}
/**
* Encrypts the specified input file to the specified output file with the
* underlying symetric encryptor.
* @param inputFile the file you want to be encrypted.
* @param outputFile the file where you want the encrypted datas to be
* written.
* @throws FileNotFoundException if the input file doesn't exists.
* @throws IOException if an I/O error occurs during reading the input file
* or writting the encrypted datas to the output file.
* @throws InvalidKeyException if the key of the underlying symetric
* encryptor is not a valid key for this operation.
* @throws NoSuchPaddingException if the algorithm contains a padding
* scheme that is not available.
**/
public void encryptFile(File inputFile, File outputFile)
throws FileNotFoundException, IOException, InvalidKeyException,
NoSuchPaddingException
{
InputStream in = new FileInputStream(inputFile);
OutputStream out = new FileOutputStream(outputFile);
Cipher cipher = null;
try
{
cipher = Cipher.getInstance(algorithm);
}
catch(NoSuchAlgorithmException ex)//never launched
{
ex.printStackTrace();
}
cipher.init(Cipher.ENCRYPT_MODE, key);
super.crypt(in, out, cipher);
in.close();
out.close();
}
/**
* Decrypts the specified input file to the specified output file with the
* underlying symetric encryptor.
* @param inputFileName the name of the file you want to be decrypted.
* @param outputFileName the name of the file where you want the decrypted
* datas to be written.
* @throws FileNotFoundException if the input file doesn't exists.
* @throws IOException if an I/O error occurs during reading the input file
* or writting the decrypted datas to the output file.
* @throws InvalidKeyException if the key of the underlying symetric
* encryptor is not a valid key for this operation.
* @throws NoSuchPaddingException if the algorithm contains a padding
* scheme that is not available.
**/
public void decryptFile(String inputFileName, String outputFileName)
throws FileNotFoundException, IOException, InvalidKeyException,
NoSuchPaddingException
{
InputStream in = new FileInputStream(inputFileName);
OutputStream out = new FileOutputStream(outputFileName);
Cipher cipher = null;
try
{
cipher = Cipher.getInstance(algorithm);
}
catch(NoSuchAlgorithmException ex)//never launched
{
ex.printStackTrace();
}
cipher.init(Cipher.DECRYPT_MODE, key);
super.crypt(in, out, cipher);
in.close();
out.close();
}
/**
* Decrypts the specified input file to the specified output file with the
* underlying symetric encryptor.
* @param inputFile the file you want to be decrypted.
* @param outputFile the file where you want the decrypted datas to be
* written.
* @throws FileNotFoundException if the input file doesn't exists.
* @throws IOException if an I/O error occurs during reading the input file
* or writting the decrypted datas to the output file.
* @throws InvalidKeyException if the key of the underlying symetric
* encryptor is not a valid key for this operation.
* @throws NoSuchPaddingException if the algorithm contains a padding
* scheme that is not available.
**/
public void decryptFile(File inputFile, File outputFile)
throws FileNotFoundException, IOException, InvalidKeyException,
NoSuchPaddingException
{
InputStream in = new FileInputStream(inputFile);
OutputStream out = new FileOutputStream(outputFile);
Cipher cipher = null;
try
{
cipher = Cipher.getInstance(algorithm);
}
catch(NoSuchAlgorithmException ex)//never launched
{
ex.printStackTrace();
}
cipher.init(Cipher.DECRYPT_MODE, key);
super.crypt(in, out, cipher);
in.close();
out.close();
}
/**
* Encrypts the specified input stream to the specified output stream with
* the underlying symetric encryptor.
* @param in the input stream you want to be encrypted.
* @param out the output stream where you want the encrypted datas to be
* written.
* @throws IOException if an I/O error occurs during reading the input stream
* or writting the decrypted datas to the output stream.
* @throws InvalidKeyException if the key of the underlying symetric
* encryptor is not a valid key for this operation.
* @throws NoSuchPaddingException if the algorithm contains a padding
* scheme that is not available.
**/
public void encryptStream(InputStream in, OutputStream out)
throws IOException, InvalidKeyException, NoSuchPaddingException
{
Cipher cipher = null;
try
{
cipher = Cipher.getInstance(algorithm);
}
catch(NoSuchAlgorithmException ex)//never launched
{
ex.printStackTrace();
}
cipher.init(Cipher.ENCRYPT_MODE, key);
super.crypt(in, out, cipher);
in.close();
out.close();
}
/**
* Decrypts the specified input stream to the specified output stream with
* the underlying symetric encryptor.
* @param in the input stream you want to be decrypted.
* @param out the output stream where you want the decrypted datas to be
* written.
* @throws IOException if an I/O error occurs during reading the input stream
* or writting the decrypted datas to the output stream.
* @throws InvalidKeyException if the key of the underlying symetric
* encryptor is not a valid key for this operation.
* @throws NoSuchPaddingException if the algorithm contains a padding
* scheme that is not available.
*/
public void decryptStream(InputStream in, OutputStream out)
throws IOException, InvalidKeyException, NoSuchPaddingException
{
Cipher cipher = null;
try
{
cipher = Cipher.getInstance(algorithm);
}
catch(NoSuchAlgorithmException ex)//never launched
{
ex.printStackTrace();
}
cipher.init(Cipher.DECRYPT_MODE, key);
super.crypt(in, out, cipher);
in.close();
out.close();
}
} |
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