SHA1Hash (I2P Anonymous Network - Java Documentation

java.lang.Object
- net.i2p.data.DataStructureImpl
- - net.i2p.data.SimpleDataStructure
  - - net.i2p.crypto.SHA1Hash

All Implemented Interfaces:

Serializable, DataStructure

Direct Known Subclasses:

InfoHash, NID, TokenKey
```
public class SHA1Hash
extends SimpleDataStructure
```
Because DSAEngine was abusing Hash for 20-byte hashes

Since:

0.8.1

Author:

zzz

See Also:

Serialized Form

Field Summary

Fields
Modifier and Type Field Description

static int HASH_LENGTH
- Fields inherited from class net.i2p.data.SimpleDataStructure
  _data

Fields
Modifier and Type	Field	Description
`static int`	`HASH_LENGTH`

Constructor Summary

Constructors
Constructor Description

SHA1Hash()

SHA1Hash(byte[] data)

Constructors
Constructor	Description
`SHA1Hash()`
`SHA1Hash(byte[] data)`

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`int`	`hashCode()`	a Hash is a hash, so just use the first 4 bytes for speed
`int`	`length()`	The legal length of the byte array in this data structure
`void`	`readBytes(InputStream in)`	Sets the data.
`void`	`setData(byte[] data)`	Sets the data.

Methods inherited from class net.i2p.data.DataStructureImpl
read

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from class net.i2p.data.SimpleDataStructure
calculateHash, equals, fromBase64, fromByteArray, getData, toBase64, toByteArray, toString, writeBytes

- Field Detail
  - HASH_LENGTH
```
public static final int HASH_LENGTH
```
    See Also:
    
    Constant Field Values
- Constructor Detail
  - SHA1Hash
```
public SHA1Hash()
```
    Since:
    
    0.9.9
  - SHA1Hash
```
public SHA1Hash(byte[] data)
```
    Throws:
    
    IllegalArgumentException - if data is not 20 bytes (null is ok)
- Method Detail
  - length
```
public int length()
```
    Description copied from class: SimpleDataStructure
    
    The legal length of the byte array in this data structure
    
    Specified by:
    
    length in class SimpleDataStructure
  - setData
```
public void setData(byte[] data)
```
    Description copied from class: SimpleDataStructure
    
    Sets the data.
    
    Overrides:
    
    setData in class SimpleDataStructure
    
    Parameters:
    
    data - of correct length, or null
    
    Throws:
    
    IllegalArgumentException - if data is not 20 bytes (null is ok)
  - readBytes
```
public void readBytes(InputStream in)
               throws DataFormatException,
                      IOException
```
    Description copied from class: SimpleDataStructure
    
    Sets the data.
    
    Specified by:
    
    readBytes in interface DataStructure
    
    Overrides:
    
    readBytes in class SimpleDataStructure
    
    Parameters:
    
    in - the stream to read
    
    Throws:
    
    DataFormatException - if the data is improperly formatted
    
    IOException - if there was a problem reading the stream
  - hashCode
```
public int hashCode()
```
    a Hash is a hash, so just use the first 4 bytes for speed
    
    Overrides:
    
    hashCode in class SimpleDataStructure

Class SHA1Hash

Field Summary

Fields inherited from class net.i2p.data.SimpleDataStructure

Constructor Summary

Method Summary

Methods inherited from class net.i2p.data.DataStructureImpl

Methods inherited from class java.lang.Object

Methods inherited from class net.i2p.data.SimpleDataStructure

Field Detail

HASH_LENGTH

Constructor Detail

SHA1Hash

SHA1Hash

Method Detail

length

setData

readBytes

hashCode