I2PHMac (I2P Anonymous Network - Java Documentation

java.lang.Object
- org.bouncycastle.oldcrypto.macs.I2PHMac

All Implemented Interfaces:

Mac
```
public class I2PHMac
extends 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). As of 0.9.12, refactored to use standard MessageDigest. Deprecated - Do not use outside of router or Syndie. To be moved to router.

Constructor Summary

Constructors
Constructor Description

I2PHMac(MessageDigest digest)
Deprecated.
Use javax.crypto.Mac

I2PHMac(MessageDigest digest, int sz)

Constructors
Constructor	Description
`I2PHMac(MessageDigest digest)`	Deprecated. Use javax.crypto.Mac
`I2PHMac(MessageDigest digest, int sz)`

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`int`	`doFinal(byte[] out, int outOff)`	Compute the final statge of the MAC writing the output to the out parameter.
`String`	`getAlgorithmName()`	Return the name of the algorithm the MAC implements.
`int`	`getMacSize()`	Return the block size for this cipher (in bytes).
`MessageDigest`	`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
```
@Deprecated
public I2PHMac(MessageDigest digest)
```
    Deprecated.
    Use javax.crypto.Mac
    
    Standard HMAC, size == digest size.
  - I2PHMac
```
public I2PHMac(MessageDigest digest,
               int sz)
```
    Parameters:
    
    sz - override the digest's size, nonstandard if different. SEE NOTES in HMACGenerator about why this isn't compatible with standard HmacMD5
- Method Detail
  - getAlgorithmName
```
public 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 MessageDigest 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

Class I2PHMac

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

I2PHMac

I2PHMac

Method Detail

getAlgorithmName

getUnderlyingDigest

init

getMacSize

update

update

doFinal

reset