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java.lang.Objectnet.rim.device.api.crypto.ElGamalDecryptorEngine
public final class ElGamalDecryptorEngine
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.
Constructor Summary | ||
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ElGamalDecryptorEngine(DHPrivateKey localPrivateKey,
DHPublicKey remoteEphemeralKey)
Creates an ElGamalDecryptorEngine object. |
Method Summary | ||
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void |
decrypt(byte[] ciphertext,
int ciphertextOffset,
byte[] plaintext,
int plaintextOffset)
Decrypts the plaintext using the ElGamal algorithm. |
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String |
getAlgorithm()
Returns the name of the algorithm used to encrypt the data. |
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int |
getBlockLength()
Returns the length of a block. |
Methods inherited from class java.lang.Object |
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equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public ElGamalDecryptorEngine(DHPrivateKey localPrivateKey, DHPublicKey remoteEphemeralKey) throws CryptoTokenException, CryptoUnsupportedOperationException
ElGamalDecryptorEngine
object.
localPrivateKey
- The private key that the encrypted message with.remoteEphemeralKey
- The ephemeral key created by the encryptor engine.
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.Method Detail |
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public void decrypt(byte[] ciphertext, int ciphertextOffset, byte[] plaintext, int plaintextOffset) throws CryptoTokenException
decrypt
in interface BlockDecryptorEngine
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.
CryptoTokenException
- Thrown if an error occurs with a crypto
token or the crypto token is invalid.public String getAlgorithm()
This method will always return the String "ElGamal".
getAlgorithm
in interface BlockDecryptorEngine
public int getBlockLength()
A block represents the amount of data that can encrypted or decrypted at one time.
getBlockLength
in interface BlockDecryptorEngine
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