The PRNGDecryptor is used in conjunction with a PseudoRandomSource
to decrypt 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 BlockDecryptor uses for BlockDecryptorEngines. That is, it
allows you to use a PseudoRandomSource as an input stream instead
of relying on the decryption mechanisms exposed in the PseudoRandomSource
class.
Category:
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.
PRNGDecryptor(PseudoRandomSource keystream,
InputStream input)
Creates a PRNGDecryptor object based on an input stream
and a keystream that will create random numbers and decrypt the
ciphertext with them.
Method Summary
protected void
decrypt(byte[] data,
int offset,
int length)
Decrypts data according to the specific implementation of the chosen stream cipher.
Creates a PRNGDecryptor object based on an input stream
and a keystream that will create random numbers and decrypt the
ciphertext with them.
Parameters:
keystream - A PseudoRandomSource object to recreate the original random numbers in
order to decrypt the input stream.
input - An inputstream object containing the plaintext.
Since:
JDE 3.6.0
Category:
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
protected void decrypt(byte[] data,
int offset,
int length)
throws CryptoTokenException
data - A byte array containing the input to the stream cipher.
offset - The offset, or initial position within the array, of the information to decrypt.
length - The length, in bytes, of the information to decrypt.
Throws:
CryptoTokenException - Thrown when an error occurs with the crypto
token or the crypto token is invalid.
Category:
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.
A String that represents the name of the algorithm.
Since:
JDE 3.6.0
Category:
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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