de.innovationgate.utils.security

Class RSAEncrypter

java.lang.Object

de.innovationgate.utils.security.RSAEncrypter

public class RSAEncrypter
extends java.lang.Object

Util class to encrypt and decrypt data based on RSA keys. As RSA encryption is too slow and possible data length depends on the RSA key length we use the following widely accepted method:

• A random DES symmetric key is generated
• data is encrypted using DESEncrypter with the random DES key
• the random DES key is encrypted with the given RSA Public Key

Note: To be able to decrypt the data again the receiver of the encrypted data needs both the DES-ENCRYPTED DATA and the RSA-ENCRYPTED DES KEY!

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	RSAEncrypter.RSAEncryptedData Encrypted data created by RSAEncrypter

Constructor Summary

Constructors

Constructor and Description
RSAEncrypter(RSAKeyPair keyPair, java.lang.String passphrase)

Method Summary

Methods

Modifier and Type	Method and Description
byte[]	decrypt(RSAEncrypter.RSAEncryptedData input) Decrypts the given RSAEncryptedData
java.lang.Object	decryptItemValue(java.lang.Object value) Decrypts the given item value if it is RSA encryped.
RSAEncrypter.RSAEncryptedData	encrypt(byte[] data) Encrypt data by the given rsaKeyPair.
java.lang.String	encryptItemValue(java.lang.Object value) Encrypts the given item value to a string, which again can be stored as item value

Methods inherited from class java.lang.Object

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

Constructor Detail

RSAEncrypter

public RSAEncrypter(RSAKeyPair keyPair,
            java.lang.String passphrase)

Method Detail

encrypt

public RSAEncrypter.RSAEncryptedData encrypt(byte[] data)
                                      throws java.security.GeneralSecurityException,
                                             java.io.IOException

Encrypt data by the given rsaKeyPair.

Parameters:

data - The data to encrypt

Returns:

RSAEncryptedData

Throws:

java.security.GeneralSecurityException

java.io.IOException

decrypt

public byte[] decrypt(RSAEncrypter.RSAEncryptedData input)
               throws java.security.GeneralSecurityException,
                      java.io.IOException,
                      DESEncrypter.PersistentKeyException,
                      IncorrectPassphraseException

Decrypts the given RSAEncryptedData

Parameters:

input -

Returns:

decrypted data

Throws:

java.security.GeneralSecurityException

java.io.IOException

IncorrectPassphraseException

DESEncrypter.PersistentKeyException

decryptItemValue

public java.lang.Object decryptItemValue(java.lang.Object value)
                                  throws java.io.IOException,
                                         java.security.GeneralSecurityException,
                                         DESEncrypter.PersistentKeyException,
                                         IncorrectPassphraseException

Decrypts the given item value if it is RSA encryped. Otherwise it is given back in unmodified form

Parameters:

value - The item value

Returns:

Decrypted item value

Throws:

java.io.IOException

java.security.GeneralSecurityException

DESEncrypter.PersistentKeyException

IncorrectPassphraseException

encryptItemValue

public java.lang.String encryptItemValue(java.lang.Object value)
                                  throws java.io.IOException,
                                         java.security.GeneralSecurityException

Encrypts the given item value to a string, which again can be stored as item value

Parameters:

value - The item value to encrypt

Returns:

The encrypted item value

Throws:

java.io.IOException

java.security.GeneralSecurityException