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java.lang.Objectjava.io.OutputStream
net.rim.device.api.crypto.CryptoOutputStream
net.rim.device.api.crypto.EncryptorOutputStream
net.rim.device.api.crypto.StreamEncryptor
net.rim.device.api.crypto.PRNGEncryptor
public final class PRNGEncryptor
The PRNGEncryptor is used in conjunction with a PseudoRandomSource to encrypt data provided to this class in a stream interface to the calling class.
A PRNG represents a Pseudo Random Number Generator.
It provides a similar relationship or functionality that the BlockEncryptor uses for BlockEncryptorEngines. That is, it allows you to use a PseudoRandomSource as an output stream instead of relying on the encryption mechanisms exposed in the PseudoRandomSource class.
PRNGDecryptor| Field Summary |
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| Fields inherited from class net.rim.device.api.crypto.CryptoOutputStream |
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_out |
| Constructor Summary | ||
|---|---|---|
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PRNGEncryptor(PseudoRandomSource keystream,
OutputStream output)
Creates a PRNGEncryptor object given a specified output
stream and a keystream will generate numbers to encrypt with. |
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| Method Summary | ||
|---|---|---|
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protected void |
encrypt(byte[] plaintext,
int plaintextOffset,
int plaintextLength,
byte[] ciphertext)
Encrypts data using the specific implementation of the chosen stream encryptor. |
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String |
getAlgorithm()
Returns the name of the encryption algorithm used, eg "ARC4". |
| Methods inherited from class net.rim.device.api.crypto.StreamEncryptor |
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flush, write |
| Methods inherited from class net.rim.device.api.crypto.CryptoOutputStream |
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close, flush, getOutputStream, write, write |
| 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 PRNGEncryptor(PseudoRandomSource keystream,
OutputStream output)
PRNGEncryptor object given a specified output
stream and a keystream will generate numbers to encrypt with.
output - An OutputStream object that will contain the ciphertext after the class
has completed its task.keystream - A PseudoRandomSource object to create random numbers that
provide a secure method for encrypting the stream.| Method Detail |
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public String getAlgorithm()
getAlgorithm in class CryptoOutputStream
protected void encrypt(byte[] plaintext,
int plaintextOffset,
int plaintextLength,
byte[] ciphertext)
throws CryptoTokenException
StreamEncryptor
encrypt in class StreamEncryptorplaintext - A byte array containing the input to the stream cipher.plaintextOffset - The offset, or initial position within the array, of the information to encrypt.plaintextLength - The length of the information to encrypt.ciphertext - A byte array to hold the output of the stream cipher.
CryptoTokenException - Thrown when a problem occurs with the crypto token
or the crypto token is invalid.
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