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java.lang.Object org.bouncycastle.crypto.modes.PGPCFBBlockCipher
public class PGPCFBBlockCipher
Implements OpenPGP's rather strange version of Cipher-FeedBack (CFB) mode on top of a simple cipher. For further info see RFC 2440.
Field Summary | |
---|---|
private int |
blockSize
|
private BlockCipher |
cipher
|
private int |
count
|
private boolean |
forEncryption
|
private byte[] |
FR
|
private byte[] |
FRE
|
private boolean |
inlineIv
|
private byte[] |
IV
|
private byte[] |
tmp
|
Constructor Summary | |
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PGPCFBBlockCipher(BlockCipher cipher,
boolean inlineIv)
Basic constructor. |
Method Summary | |
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private int |
decryptBlock(byte[] in,
int inOff,
byte[] out,
int outOff)
Do the appropriate processing for CFB mode decryption. |
private int |
decryptBlockWithIV(byte[] in,
int inOff,
byte[] out,
int outOff)
Do the appropriate processing for CFB IV mode decryption. |
private int |
encryptBlock(byte[] in,
int inOff,
byte[] out,
int outOff)
Do the appropriate processing for CFB mode encryption. |
private int |
encryptBlockWithIV(byte[] in,
int inOff,
byte[] out,
int outOff)
Do the appropriate processing for CFB IV mode encryption. |
private byte |
encryptByte(byte data,
int blockOff)
Encrypt one byte of data according to CFB mode. |
java.lang.String |
getAlgorithmName()
return the algorithm name and mode. |
int |
getBlockSize()
return the block size we are operating at. |
BlockCipher |
getUnderlyingCipher()
return the underlying block cipher that we are wrapping. |
void |
init(boolean forEncryption,
CipherParameters params)
Initialise the cipher and, possibly, the initialisation vector (IV). |
int |
processBlock(byte[] in,
int inOff,
byte[] out,
int outOff)
Process one block of input from the array in and write it to the out array. |
void |
reset()
reset the chaining vector back to the IV and reset the underlying cipher. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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private byte[] IV
private byte[] FR
private byte[] FRE
private byte[] tmp
private BlockCipher cipher
private int count
private int blockSize
private boolean forEncryption
private boolean inlineIv
Constructor Detail |
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public PGPCFBBlockCipher(BlockCipher cipher, boolean inlineIv)
cipher
- the block cipher to be used as the basis of the
feedback mode.inlineIv
- if true this is for PGP CFB with a prepended iv.Method Detail |
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public BlockCipher getUnderlyingCipher()
public java.lang.String getAlgorithmName()
getAlgorithmName
in interface BlockCipher
public int getBlockSize()
getBlockSize
in interface BlockCipher
public int processBlock(byte[] in, int inOff, byte[] out, int outOff) throws DataLengthException, java.lang.IllegalStateException
processBlock
in interface BlockCipher
in
- the array containing the input data.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.
java.lang.IllegalStateException
- if the cipher isn't initialised.public void reset()
reset
in interface BlockCipher
public void init(boolean forEncryption, CipherParameters params) throws java.lang.IllegalArgumentException
init
in interface BlockCipher
forEncryption
- if true the cipher is initialised for
encryption, if false for decryption.params
- the key and other data required by the cipher.
java.lang.IllegalArgumentException
- if the params argument is
inappropriate.private byte encryptByte(byte data, int blockOff)
data
- the byte to encryptwhere
- am i in the current block, determines when to resync the blockprivate int encryptBlockWithIV(byte[] in, int inOff, byte[] out, int outOff) throws DataLengthException, java.lang.IllegalStateException
in
- the array containing the data to be encrypted.inOff
- offset into the in array the data starts at.out
- the array the encrypted 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.
java.lang.IllegalStateException
- if the cipher isn't initialised.private int decryptBlockWithIV(byte[] in, int inOff, byte[] out, int outOff) throws DataLengthException, java.lang.IllegalStateException
in
- the array containing the data to be decrypted.inOff
- offset into the in array the data starts at.out
- the array the encrypted 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.
java.lang.IllegalStateException
- if the cipher isn't initialised.private int encryptBlock(byte[] in, int inOff, byte[] out, int outOff) throws DataLengthException, java.lang.IllegalStateException
in
- the array containing the data to be encrypted.inOff
- offset into the in array the data starts at.out
- the array the encrypted 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.
java.lang.IllegalStateException
- if the cipher isn't initialised.private int decryptBlock(byte[] in, int inOff, byte[] out, int outOff) throws DataLengthException, java.lang.IllegalStateException
in
- the array containing the data to be decrypted.inOff
- offset into the in array the data starts at.out
- the array the encrypted 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.
java.lang.IllegalStateException
- if the cipher isn't initialised.
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