java.lang.Object | |
↳ | org.bouncycastle.crypto.modes.OpenPGPCFBBlockCipher |
Implements OpenPGP's rather strange version of Cipher-FeedBack (CFB) mode on top of a simple cipher. This class assumes the IV has been prepended to the data stream already, and just accomodates the reset after (blockSize + 2) bytes have been read.
For further info see RFC 2440.
Public Constructors | |||||||||||
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Basic constructor.
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Public Methods | |||||||||||
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return the algorithm name and mode.
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return the block size we are operating at.
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return the underlying block cipher that we are wrapping.
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Initialise the cipher and, possibly, the initialisation vector (IV).
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Process one block of input from the array in and write it to
the out array.
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reset the chaining vector back to the IV and reset the underlying
cipher.
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Inherited Methods | |||||||||||
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From class
java.lang.Object
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From interface
org.bouncycastle.crypto.BlockCipher
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Basic constructor.
cipher | the block cipher to be used as the basis of the feedback mode. |
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return the algorithm name and mode.
return the block size we are operating at.
return the underlying block cipher that we are wrapping.
Initialise the cipher and, possibly, the initialisation vector (IV). If an IV isn't passed as part of the parameter, the IV will be all zeros. An IV which is too short is handled in FIPS compliant fashion.
forEncryption | if true the cipher is initialised for encryption, if false for decryption. |
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params | the key and other data required by the cipher. |
IllegalArgumentException | if the params argument is inappropriate. |
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Process one block of input from the array in and write it to the out array.
in | the array containing the input data. |
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inOff | offset into the in array the data starts at. |
out | the array the output data will be copied into. |
outOff | the offset into the out array the output will start at. |
DataLengthException | if there isn't enough data in in, or space in out. |
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IllegalStateException | if the cipher isn't initialised. |
reset the chaining vector back to the IV and reset the underlying cipher.