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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. |
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 StreamEncryptor
plaintext
- 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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