Bouncy Castle Cryptography 1.11 API Specification: Class CFBBlockCipherMac
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Bouncy Castle Cryptography 1.11 | ||||||||
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java.lang.Object | +--org.bouncycastle.crypto.macs.CFBBlockCipherMac
Constructor Summary | |
CFBBlockCipherMac(BlockCipher cipher)
create a standard MAC based on a CFB block cipher. |
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CFBBlockCipherMac(BlockCipher cipher,
BlockCipherPadding padding)
create a standard MAC based on a CFB block cipher. |
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CFBBlockCipherMac(BlockCipher cipher,
int cfbBitSize,
int macSizeInBits)
create a standard MAC based on a block cipher with the size of the MAC been given in bits. |
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CFBBlockCipherMac(BlockCipher cipher,
int cfbBitSize,
int macSizeInBits,
BlockCipherPadding padding)
create a standard MAC based on a block cipher with the size of the MAC been given in bits. |
Method Summary | |
int |
doFinal(byte[] out,
int outOff)
Compute the final statge of the MAC writing the output to the out parameter. |
java.lang.String |
getAlgorithmName()
Return the name of the algorithm the MAC implements. |
int |
getMacSize()
Return the block size for this cipher (in bytes). |
void |
init(CipherParameters params)
Initialise the MAC. |
void |
reset()
Reset the mac generator. |
void |
update(byte in)
add a single byte to the mac for processing. |
void |
update(byte[] in,
int inOff,
int len)
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Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
public CFBBlockCipherMac(BlockCipher cipher)
cipher
- the cipher to be used as the basis of the MAC generation.public CFBBlockCipherMac(BlockCipher cipher, BlockCipherPadding padding)
cipher
- the cipher to be used as the basis of the MAC generation.padding
- the padding to be used.public CFBBlockCipherMac(BlockCipher cipher, int cfbBitSize, int macSizeInBits)
Note: the size of the MAC must be at least 24 bits (FIPS Publication 81), or 16 bits if being used as a data authenticator (FIPS Publication 113), and in general should be less than the size of the block cipher as it reduces the chance of an exhaustive attack (see Handbook of Applied Cryptography).
cipher
- the cipher to be used as the basis of the MAC generation.cfbBitSize
- the size of an output block produced by the CFB mode.macSizeInBits
- the size of the MAC in bits, must be a multiple of 8.public CFBBlockCipherMac(BlockCipher cipher, int cfbBitSize, int macSizeInBits, BlockCipherPadding padding)
Note: the size of the MAC must be at least 24 bits (FIPS Publication 81), or 16 bits if being used as a data authenticator (FIPS Publication 113), and in general should be less than the size of the block cipher as it reduces the chance of an exhaustive attack (see Handbook of Applied Cryptography).
cipher
- the cipher to be used as the basis of the MAC generation.cfbBitSize
- the size of an output block produced by the CFB mode.macSizeInBits
- the size of the MAC in bits, must be a multiple of 8.padding
- a padding to be used.Method Detail |
public java.lang.String getAlgorithmName()
Mac
getAlgorithmName
in interface Mac
org.bouncycastle.crypto.Mac
public void init(CipherParameters params)
Mac
init
in interface Mac
org.bouncycastle.crypto.Mac
param
- the key and other data required by the MAC.java.lang.IllegalArgumentException
- if the params argument is
inappropriate.public int getMacSize()
Mac
getMacSize
in interface Mac
org.bouncycastle.crypto.Mac
public void update(byte in)
Mac
update
in interface Mac
org.bouncycastle.crypto.Mac
in
- the byte to be processed.java.lang.IllegalStateException
- if the MAC is not initialised.public void update(byte[] in, int inOff, int len)
update
in interface Mac
org.bouncycastle.crypto.Mac
in
- the array containing the input.inOff
- the index in the array the data begins at.len
- the length of the input starting at inOff.java.lang.IllegalStateException
- if the MAC is not initialised.DataLengthException
- if there isn't enough data in in.public int doFinal(byte[] out, int outOff)
Mac
doFinal leaves the MAC in the same state it was after the last init.
doFinal
in interface Mac
org.bouncycastle.crypto.Mac
out
- the array the MAC is to be output to.outOff
- the offset into the out buffer the output is to start at.DataLengthException
- if there isn't enough space in out.java.lang.IllegalStateException
- if the MAC is not initialised.public void reset()
reset
in interface Mac
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