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net.rim.device.api.crypto
Class ElGamalDecryptorEngine

java.lang.Object
  |
  +--net.rim.device.api.crypto.ElGamalDecryptorEngine
All Implemented Interfaces:
BlockDecryptorEngine, PrivateKeyDecryptorEngine

public final class ElGamalDecryptorEngine
extends Object
implements PrivateKeyDecryptorEngine

In order to decrypt with the ElGamal decryptor engine, two keys are required.

The version of ElGamal that we implemented can be found in "Applied Cryptography", by Bruce Schneier, in section 19.6 ( 1996 ).

The decrypting private key and a second ephemeral key must be recieved along with ciphertext. BOTH are necessary to decrypt the data.

Category:
Certicom: This element is part of the Certicom Cryptography APIs. The Certicom Cryptography APIs provide the tools you need, including ECC based algorithms, to integrate high performance data security into your applications, such as public key data encryption and decryption, digital signatures, and data authentication. Since the Certicom Cryptography API is already in the JDE, its use will remove the need for you to engage in time and resource intensive security integration so that you have lower development costs and a faster time to market. Use of the Certicom Cryptography API requires a license from Certicom. Please contact Certicom directly for more information on licensing fees and conditions.

Certicom Contact Information

Phone:613-254-9258

Email: sales@certicom.com

Website: http://www.certicom.com/rim
Signed: This element is only accessible by signed applications. If you intend to use this element, please visit http://www.blackberry.com/go/codesigning to obtain a set of code signing keys. Code signing is only required for applications running on BlackBerry smartphones; development on BlackBerry Smartphone Simulators can occur without code signing.

Since:
JDE 3.6.0

Constructor Summary
 Category: Certicom Category: Signed ElGamalDecryptorEngine(DHPrivateKey localPrivateKey, DHPublicKey remoteEphemeralKey)
          Creates an ElGamalDecryptorEngine object.
 
Method Summary
 Category: Certicom Category: Signed  void decrypt(byte[] ciphertext, int ciphertextOffset, byte[] plaintext, int plaintextOffset)
          Decrypts the plaintext using the ElGamal algorithm.
 Category: Certicom Category: Signed  String getAlgorithm()
          Returns the name of the algorithm used to encrypt the data.
 Category: Certicom Category: Signed  int getBlockLength()
          Returns the length of a block.
 
Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

ElGamalDecryptorEngine

public ElGamalDecryptorEngine(DHPrivateKey localPrivateKey,
                              DHPublicKey remoteEphemeralKey)
                       throws CryptoTokenException,
                              CryptoUnsupportedOperationException
Creates an ElGamalDecryptorEngine object.
Parameters:
localPrivateKey - The private key that the encrypted message with.
remoteEphemeralKey - The ephemeral key created by the encryptor engine.
Throws:
CryptoTokenException - Thrown if an error occurs with a crypto token or the crypto token is invalid.
CryptoUnsupportedOperationException - Thrown if a call is made to an unsupported operation.
Since:
JDE 3.6.0
Category:
Certicom: This element is part of the Certicom Cryptography APIs. The Certicom Cryptography APIs provide the tools you need, including ECC based algorithms, to integrate high performance data security into your applications, such as public key data encryption and decryption, digital signatures, and data authentication. Since the Certicom Cryptography API is already in the JDE, its use will remove the need for you to engage in time and resource intensive security integration so that you have lower development costs and a faster time to market. Use of the Certicom Cryptography API requires a license from Certicom. Please contact Certicom directly for more information on licensing fees and conditions.

Certicom Contact Information

Phone:613-254-9258

Email: sales@certicom.com

Website: http://www.certicom.com/rim
Signed: This element is only accessible by signed applications. If you intend to use this element, please visit http://www.blackberry.com/go/codesigning to obtain a set of code signing keys. Code signing is only required for applications running on BlackBerry smartphones; development on BlackBerry Smartphone Simulators can occur without code signing.

Method Detail

decrypt

public void decrypt(byte[] ciphertext,
                    int ciphertextOffset,
                    byte[] plaintext,
                    int plaintextOffset)
             throws CryptoTokenException
Decrypts the plaintext using the ElGamal algorithm.
Parameters:
ciphertext - The byte array containing the ciphertext to decode.
ciphertextOffset - The offset, or start position, of the ciphertext within the array.
plaintext - The array to store the plaintext.
plaintextOffset - The offset, or start position, of the plaintext withiin the array.
Throws:
CryptoTokenException - Thrown if an error occurs with a crypto token or the crypto token is invalid.
Since:
JDE 3.6.0
Category:
Certicom: This element is part of the Certicom Cryptography APIs. The Certicom Cryptography APIs provide the tools you need, including ECC based algorithms, to integrate high performance data security into your applications, such as public key data encryption and decryption, digital signatures, and data authentication. Since the Certicom Cryptography API is already in the JDE, its use will remove the need for you to engage in time and resource intensive security integration so that you have lower development costs and a faster time to market. Use of the Certicom Cryptography API requires a license from Certicom. Please contact Certicom directly for more information on licensing fees and conditions.

Certicom Contact Information

Phone:613-254-9258

Email: sales@certicom.com

Website: http://www.certicom.com/rim
Signed: This element is only accessible by signed applications. If you intend to use this element, please visit http://www.blackberry.com/go/codesigning to obtain a set of code signing keys. Code signing is only required for applications running on BlackBerry smartphones; development on BlackBerry Smartphone Simulators can occur without code signing.


getAlgorithm

public String getAlgorithm()
Returns the name of the algorithm used to encrypt the data.

This method will always return the String "ElGamal".

Returns:
The name of the algorithm used, ie "ElGamal".
Since:
JDE 3.6.0
Category:
Certicom: This element is part of the Certicom Cryptography APIs. The Certicom Cryptography APIs provide the tools you need, including ECC based algorithms, to integrate high performance data security into your applications, such as public key data encryption and decryption, digital signatures, and data authentication. Since the Certicom Cryptography API is already in the JDE, its use will remove the need for you to engage in time and resource intensive security integration so that you have lower development costs and a faster time to market. Use of the Certicom Cryptography API requires a license from Certicom. Please contact Certicom directly for more information on licensing fees and conditions.

Certicom Contact Information

Phone:613-254-9258

Email: sales@certicom.com

Website: http://www.certicom.com/rim
Signed: This element is only accessible by signed applications. If you intend to use this element, please visit http://www.blackberry.com/go/codesigning to obtain a set of code signing keys. Code signing is only required for applications running on BlackBerry smartphones; development on BlackBerry Smartphone Simulators can occur without code signing.


getBlockLength

public int getBlockLength()
Returns the length of a block.

A block represents the amount of data that can encrypted or decrypted at one time.

Returns:
The required length of each block, in bytes, to be passed through the decryptor.
Since:
JDE 3.6.0
Category:
Certicom: This element is part of the Certicom Cryptography APIs. The Certicom Cryptography APIs provide the tools you need, including ECC based algorithms, to integrate high performance data security into your applications, such as public key data encryption and decryption, digital signatures, and data authentication. Since the Certicom Cryptography API is already in the JDE, its use will remove the need for you to engage in time and resource intensive security integration so that you have lower development costs and a faster time to market. Use of the Certicom Cryptography API requires a license from Certicom. Please contact Certicom directly for more information on licensing fees and conditions.

Certicom Contact Information

Phone:613-254-9258

Email: sales@certicom.com

Website: http://www.certicom.com/rim
Signed: This element is only accessible by signed applications. If you intend to use this element, please visit http://www.blackberry.com/go/codesigning to obtain a set of code signing keys. Code signing is only required for applications running on BlackBerry smartphones; development on BlackBerry Smartphone Simulators can occur without code signing.




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