CFBDecryptor is the class used to iterate a given block cipher in 8 or 64-bit
Cipher Feedback (CFB) mode. CFB mode is defined in FIPS 81.
Note: CFB mode uses encryption for both the encryption and decryption of
the block cipher and hence should only be used with symmetric cryptography
and not with asymmetric cryptography.
For a code sample using the CFB decryptor, click here.
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.
Creates the CFB cipher with the given encryptor engine and initialization vector.
It is imperative that the initialization vector is always unique for each key used
or a cryptanalyst can retrieve the plaintext.
Parameters:
engine - The SymmetricKeyEncryptorEngine object to use for decryption.
iv - The initialization vector. This must
have the same length as the block length of the engine.
input - The underlying InputStream object used to read in data for decryption.
eightBitCFB - A boolean to indicate the amount of cipher feedback.
If set, then 8 bits of cipher feedback are used, otherwise, the encryptor engine's
block size determines the amount of cipher feedback.
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 dataOffset,
int dataLength)
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.
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.
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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