org.bouncycastle.crypto.macs
Class I2PHMac

java.lang.Object
  extended by org.bouncycastle.crypto.macs.I2PHMac
All Implemented Interfaces:
Mac

public class I2PHMac
extends java.lang.Object
implements Mac

HMAC implementation based on RFC2104 H(K XOR opad, H(K XOR ipad, text)) modified by jrandom to use the session key byte array directly and to cache a frequently used buffer (called on doFinal). changes released into the public domain in 2005. This is renamed from HMac because the constructor HMac(digest, sz) does not exist in the standard bouncycastle library, thus it conflicts in JVMs that contain the standard library (Android).


Constructor Summary
I2PHMac(Digest digest)
           
I2PHMac(Digest digest, int sz)
           
 
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).
 Digest getUnderlyingDigest()
           
 void init(byte[] key)
          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)
           
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

I2PHMac

public I2PHMac(Digest digest)

I2PHMac

public I2PHMac(Digest digest,
               int sz)
Method Detail

getAlgorithmName

public java.lang.String getAlgorithmName()
Description copied from interface: Mac
Return the name of the algorithm the MAC implements.

Specified by:
getAlgorithmName in interface Mac
Returns:
the name of the algorithm the MAC implements.

getUnderlyingDigest

public Digest getUnderlyingDigest()

init

public void init(byte[] key)
Description copied from interface: Mac
Initialise the MAC.

Specified by:
init in interface Mac
Parameters:
key - the key required by the MAC.

getMacSize

public int getMacSize()
Description copied from interface: Mac
Return the block size for this cipher (in bytes).

Specified by:
getMacSize in interface Mac
Returns:
the block size for this cipher in bytes.

update

public void update(byte in)
Description copied from interface: Mac
add a single byte to the mac for processing.

Specified by:
update in interface Mac
Parameters:
in - the byte to be processed.

update

public void update(byte[] in,
                   int inOff,
                   int len)
Specified by:
update in interface Mac
Parameters:
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.

doFinal

public int doFinal(byte[] out,
                   int outOff)
Description copied from interface: Mac
Compute the final statge of the MAC writing the output to the out parameter.

doFinal leaves the MAC in the same state it was after the last init.

Specified by:
doFinal in interface Mac
Parameters:
out - the array the MAC is to be output to.
outOff - the offset into the out buffer the output is to start at.

reset

public void reset()
Reset the mac generator.

Specified by:
reset in interface Mac