java.lang.Object
- org.jets3t.service.security.EncryptionUtil

```
public class EncryptionUtil
extends Object
```
Utility class to handle encryption and decryption in the JetS3t suite.
This class uses properties obtained through Jets3tProperties. For more information on these properties please refer to JetS3t Configuration

Author:

James Murty

Field Summary

Fields
Modifier and Type Field Description

static String DEFAULT_ALGORITHM

static String DEFAULT_VERSION

Constructor Summary

Constructors
Constructor	Description
`EncryptionUtil(String encryptionKey)`	Constructs class configured with the provided password, and set up to use the default encryption algorithm PBEWithMD5AndDES.
`EncryptionUtil(String encryptionKey, String algorithm, String version)`	Constructs class configured with the provided password, and set up to use the encryption method specified.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`static byte[]`	`convertRsaPemToDer(InputStream is)`	Convert a PEM encoded RSA certificate file into a DER format byte array.
`byte[]`	`decrypt(byte[] data)`	Decrypts byte data to bytes.
`byte[]`	`decrypt(byte[] data, int startIndex, int endIndex)`	Decrypts a byte data range to bytes.
`CipherInputStream`	`decrypt(InputStream is)`	Wraps an input stream in an decrypting cipher stream.
`CipherOutputStream`	`decrypt(OutputStream os)`	Wraps an output stream in a decrypting cipher stream.
`String`	`decryptString(byte[] data)`	Decrypts byte data to a UTF-8 string.
`String`	`decryptString(byte[] data, int startIndex, int endIndex)`	Decrypts a UTF-8 string.
`byte[]`	`encrypt(byte[] data)`	Encrypts byte data to bytes.
`CipherInputStream`	`encrypt(InputStream is)`	Wraps an input stream in an encrypting cipher stream.
`CipherOutputStream`	`encrypt(OutputStream os)`	Wraps an output stream in an encrypting cipher stream.
`byte[]`	`encrypt(String data)`	Encrypts a UTF-8 string to byte data.
`String`	`getAlgorithm()`
`long`	`getEncryptedOutputSize(long inputSize)`	Returns an estimate of the number of bytes that will result when data of the given length is encrypted.
`static boolean`	`isCipherAvailableForUse(String cipher)`	Returns true if the given cipher is available and can be used by this encryption utility.
`static String[]`	`listAvailablePbeCiphers(boolean testAvailability)`	Lists the PBE ciphers available on the system, optionally eliminating those ciphers that are apparently available but cannot actually be used (perhaps due to the lack of export-grade JCE settings).
`static Provider[]`	`listAvailableProviders()`
`static void`	`main(String[] args)`
`static byte[]`	`signWithRsaSha1(byte[] derPrivateKeyBytes, byte[] dataToSign)`	Generate an RSA SHA1 signature of the given data using the given private key DER certificate.

Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail
- DEFAULT_VERSION
```
public static final String DEFAULT_VERSION
```
  See Also:
  
  Constant Field Values
- DEFAULT_ALGORITHM
```
public static final String DEFAULT_ALGORITHM
```
  See Also:
  
  Constant Field Values

Constructor Detail
- EncryptionUtil
```
public EncryptionUtil(String encryptionKey,
                      String algorithm,
                      String version)
               throws InvalidKeyException,
                      NoSuchAlgorithmException,
                      NoSuchPaddingException,
                      InvalidKeySpecException
```
  Constructs class configured with the provided password, and set up to use the encryption method specified.
  
  Parameters:
  
  encryptionKey - the password to use for encryption/decryption.
  
  algorithm - the Java name of an encryption algorithm to use, eg PBEWithMD5AndDES
  
  version - the version of encyption to use, for historic and future compatibility. Unless using an historic version, this should always be DEFAULT_VERSION
  
  Throws:
  
  InvalidKeyException
  
  NoSuchAlgorithmException
  
  NoSuchPaddingException
  
  InvalidKeySpecException
- EncryptionUtil
```
public EncryptionUtil(String encryptionKey)
               throws InvalidKeyException,
                      NoSuchAlgorithmException,
                      NoSuchPaddingException,
                      InvalidKeySpecException
```
  Constructs class configured with the provided password, and set up to use the default encryption algorithm PBEWithMD5AndDES.
  
  Parameters:
  
  encryptionKey - the password to use for encryption/decryption.
  
  Throws:
  
  InvalidKeyException
  
  NoSuchAlgorithmException
  
  NoSuchPaddingException
  
  InvalidKeySpecException

Method Detail

encrypt

public byte[] encrypt(String data)
               throws IllegalStateException,
                      IllegalBlockSizeException,
                      BadPaddingException,
                      UnsupportedEncodingException,
                      InvalidKeySpecException,
                      InvalidKeyException,
                      InvalidAlgorithmParameterException,
                      NoSuchAlgorithmException,
                      NoSuchPaddingException

Encrypts a UTF-8 string to byte data.

Parameters:: data - data to encrypt.
Returns:: encrypted data.
Throws:: IllegalStateException; IllegalBlockSizeException; BadPaddingException; UnsupportedEncodingException; InvalidKeySpecException; InvalidKeyException; InvalidAlgorithmParameterException; NoSuchAlgorithmException; NoSuchPaddingException

decryptString

public String decryptString(byte[] data)
                     throws InvalidKeyException,
                            InvalidAlgorithmParameterException,
                            UnsupportedEncodingException,
                            IllegalStateException,
                            IllegalBlockSizeException,
                            BadPaddingException,
                            NoSuchAlgorithmException,
                            NoSuchPaddingException

Decrypts byte data to a UTF-8 string.

Parameters:: data - data to decrypt.
Returns:: UTF-8 string of decrypted data.
Throws:: InvalidKeyException; InvalidAlgorithmParameterException; UnsupportedEncodingException; IllegalStateException; IllegalBlockSizeException; BadPaddingException; NoSuchAlgorithmException; NoSuchPaddingException

decryptString

public String decryptString(byte[] data,
                            int startIndex,
                            int endIndex)
                     throws InvalidKeyException,
                            InvalidAlgorithmParameterException,
                            UnsupportedEncodingException,
                            IllegalStateException,
                            IllegalBlockSizeException,
                            BadPaddingException,
                            NoSuchAlgorithmException,
                            NoSuchPaddingException

Decrypts a UTF-8 string.

Parameters:: data - data to decrypt.; startIndex - start index of data to decrypt.; endIndex - end index of data to decrypt.
Returns:: UTF-8 string of decrypted data.
Throws:: InvalidKeyException; InvalidAlgorithmParameterException; UnsupportedEncodingException; IllegalStateException; IllegalBlockSizeException; BadPaddingException; NoSuchAlgorithmException; NoSuchPaddingException

encrypt

public byte[] encrypt(byte[] data)
               throws IllegalStateException,
                      IllegalBlockSizeException,
                      BadPaddingException,
                      InvalidKeyException,
                      InvalidAlgorithmParameterException,
                      NoSuchAlgorithmException,
                      NoSuchPaddingException

Encrypts byte data to bytes.

Parameters:: data - data to encrypt.
Returns:: encrypted data.
Throws:: IllegalStateException; IllegalBlockSizeException; BadPaddingException; InvalidKeyException; InvalidAlgorithmParameterException; NoSuchAlgorithmException; NoSuchPaddingException

decrypt

public byte[] decrypt(byte[] data)
               throws InvalidKeyException,
                      InvalidAlgorithmParameterException,
                      IllegalStateException,
                      IllegalBlockSizeException,
                      BadPaddingException,
                      NoSuchAlgorithmException,
                      NoSuchPaddingException

Decrypts byte data to bytes.

Parameters:: data - data to decrypt
Returns:: decrypted data.
Throws:: InvalidKeyException; InvalidAlgorithmParameterException; IllegalStateException; IllegalBlockSizeException; BadPaddingException; NoSuchAlgorithmException; NoSuchPaddingException

decrypt

public byte[] decrypt(byte[] data,
                      int startIndex,
                      int endIndex)
               throws InvalidKeyException,
                      InvalidAlgorithmParameterException,
                      IllegalStateException,
                      IllegalBlockSizeException,
                      BadPaddingException,
                      NoSuchAlgorithmException,
                      NoSuchPaddingException

Decrypts a byte data range to bytes.

Parameters:: data -; startIndex -; endIndex -
Returns:: decrypted data.
Throws:: InvalidKeyException; InvalidAlgorithmParameterException; IllegalStateException; IllegalBlockSizeException; BadPaddingException; NoSuchAlgorithmException; NoSuchPaddingException

encrypt

public CipherInputStream encrypt(InputStream is)
                          throws InvalidKeyException,
                                 InvalidAlgorithmParameterException,
                                 NoSuchAlgorithmException,
                                 NoSuchPaddingException

Wraps an input stream in an encrypting cipher stream.

Parameters:: is -
Returns:: encrypting cipher input stream.
Throws:: InvalidKeyException; InvalidAlgorithmParameterException; NoSuchAlgorithmException; NoSuchPaddingException

decrypt

public CipherInputStream decrypt(InputStream is)
                          throws InvalidKeyException,
                                 InvalidAlgorithmParameterException,
                                 NoSuchAlgorithmException,
                                 NoSuchPaddingException

Wraps an input stream in an decrypting cipher stream.

Parameters:: is -
Returns:: decrypting cipher input stream.
Throws:: InvalidKeyException; InvalidAlgorithmParameterException; NoSuchAlgorithmException; NoSuchPaddingException

encrypt

public CipherOutputStream encrypt(OutputStream os)
                           throws InvalidKeyException,
                                  InvalidAlgorithmParameterException,
                                  NoSuchAlgorithmException,
                                  NoSuchPaddingException

Wraps an output stream in an encrypting cipher stream.

Parameters:: os -
Returns:: encrypting cipher output stream.
Throws:: InvalidKeyException; InvalidAlgorithmParameterException; NoSuchAlgorithmException; NoSuchPaddingException

decrypt

public CipherOutputStream decrypt(OutputStream os)
                           throws InvalidKeyException,
                                  InvalidAlgorithmParameterException,
                                  NoSuchAlgorithmException,
                                  NoSuchPaddingException

Wraps an output stream in a decrypting cipher stream.

Parameters:: os -
Returns:: decrypting cipher output stream.
Throws:: InvalidKeyException; InvalidAlgorithmParameterException; NoSuchAlgorithmException; NoSuchPaddingException

getEncryptedOutputSize
```
public long getEncryptedOutputSize(long inputSize)
                            throws InvalidKeyException,
                                   InvalidAlgorithmParameterException,
                                   NoSuchAlgorithmException,
                                   NoSuchPaddingException
```
Returns an estimate of the number of bytes that will result when data of the given length is encrypted. The accuracy of this estimate may depend on the cipher you are using, so be wary of trusting this estimate without supporting evidence.

Parameters:

inputSize - The number of bytes you intend to encrypt.

Returns:

an estimate of the number of bytes that will be generated by the encryption cipher for the given number of bytes of input.

Throws:

InvalidKeyException

InvalidAlgorithmParameterException

NoSuchAlgorithmException

NoSuchPaddingException

getAlgorithm
```
public String getAlgorithm()
```
Returns:

the Java name of the cipher algorithm being used by this class.

isCipherAvailableForUse
```
public static boolean isCipherAvailableForUse(String cipher)
```
Returns true if the given cipher is available and can be used by this encryption utility. To determine whether the cipher can actually be used a test string is encrypted using the cipher.

Parameters:

cipher -

Returns:

true if the cipher is available and can be used, false otherwise.

listAvailablePbeCiphers
```
public static String[] listAvailablePbeCiphers(boolean testAvailability)
```
Lists the PBE ciphers available on the system, optionally eliminating those ciphers that are apparently available but cannot actually be used (perhaps due to the lack of export-grade JCE settings).

Parameters:

testAvailability - if true each apparently available cipher is tested and only those that pass isCipherAvailableForUse(String) are returned.

Returns:

a list of all the available PBE cipher names on the system.

listAvailableProviders

public static Provider[] listAvailableProviders()

signWithRsaSha1

public static byte[] signWithRsaSha1(byte[] derPrivateKeyBytes,
                                     byte[] dataToSign)
                              throws NoSuchAlgorithmException,
                                     InvalidKeyException,
                                     SignatureException,
                                     InvalidKeySpecException,
                                     NoSuchProviderException

Generate an RSA SHA1 signature of the given data using the given private key DER certificate. Based on example code from: http://www.java2s.com/Tutorial/Java/0490__Security/RSASignatureGeneration.htm http://forums.sun.com/thread.jspa?threadID=5175986

Throws:: NoSuchAlgorithmException; InvalidKeyException; SignatureException; InvalidKeySpecException; NoSuchProviderException

convertRsaPemToDer
```
public static byte[] convertRsaPemToDer(InputStream is)
                                 throws IOException
```
Convert a PEM encoded RSA certificate file into a DER format byte array.

Parameters:

is - Input stream for PEM encoded RSA certificate data.

Returns:

The RSA certificate data in DER format.

Throws:

IOException

main

public static void main(String[] args)
                 throws Exception

Throws:: Exception

Modifier and Type	Field	Description
`static String`	`DEFAULT_ALGORITHM`
`static String`	`DEFAULT_VERSION`

Class EncryptionUtil

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

DEFAULT_VERSION

DEFAULT_ALGORITHM

Constructor Detail

EncryptionUtil

EncryptionUtil

Method Detail

encrypt

decryptString

decryptString

encrypt

decrypt

decrypt

encrypt

decrypt

encrypt

decrypt

getEncryptedOutputSize

getAlgorithm

isCipherAvailableForUse

listAvailablePbeCiphers

listAvailableProviders

signWithRsaSha1

convertRsaPemToDer

main