java.lang.Object
- org.bouncycastle.crypto.digests.GeneralDigest
- - org.bouncycastle.crypto.digests.SHA256Digest

All Implemented Interfaces:: Digest, EncodableDigest, ExtendedDigest, Memoable

public class SHA256Digest
extends GeneralDigest
implements EncodableDigest

FIPS 180-2 implementation of SHA-256.

         block  word  digest
 SHA-1   512    32    160
 SHA-256 512    32    256
 SHA-384 1024   64    384
 SHA-512 1024   64    512

Constructor Summary

Constructors
Constructor	Description
`SHA256Digest()`	Standard constructor
`SHA256Digest(byte[] encodedState)`	State constructor - create a digest initialised with the state of a previous one.
`SHA256Digest(SHA256Digest t)`	Copy constructor.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`Memoable`	`copy()`	Produce a copy of this object with its configuration and in its current state.
`int`	`doFinal(byte[] out, int outOff)`	close the digest, producing the final digest value.
`java.lang.String`	`getAlgorithmName()`	return the algorithm name
`int`	`getDigestSize()`	return the size, in bytes, of the digest produced by this message digest.
`byte[]`	`getEncodedState()`	Return an encoded byte array for the digest's internal state
`protected void`	`processBlock()`
`protected void`	`processLength(long bitLength)`
`protected void`	`processWord(byte[] in, int inOff)`
`void`	`reset()`	reset the chaining variables
`void`	`reset(Memoable other)`	Restore a copied object state into this object.

Methods inherited from class org.bouncycastle.crypto.digests.GeneralDigest
copyIn, finish, getByteLength, populateState, update, update

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

- Constructor Detail
  - SHA256Digest
```
public SHA256Digest()
```
    Standard constructor
  - SHA256Digest
```
public SHA256Digest(SHA256Digest t)
```
    Copy constructor. This will copy the state of the provided message digest.
  - SHA256Digest
```
public SHA256Digest(byte[] encodedState)
```
    State constructor - create a digest initialised with the state of a previous one.
    
    Parameters:
    
    encodedState - the encoded state from the originating digest.
- Method Detail
  - getAlgorithmName
```
public java.lang.String getAlgorithmName()
```
    Description copied from interface: Digest
    
    return the algorithm name
    
    Specified by:
    
    getAlgorithmName in interface Digest
    
    Returns:
    
    the algorithm name
  - getDigestSize
```
public int getDigestSize()
```
    Description copied from interface: Digest
    
    return the size, in bytes, of the digest produced by this message digest.
    
    Specified by:
    
    getDigestSize in interface Digest
    
    Returns:
    
    the size, in bytes, of the digest produced by this message digest.
  - processWord
```
protected void processWord(byte[] in,
                           int inOff)
```
    Specified by:
    
    processWord in class GeneralDigest
  - processLength
```
protected void processLength(long bitLength)
```
    Specified by:
    
    processLength in class GeneralDigest
  - doFinal
```
public int doFinal(byte[] out,
                   int outOff)
```
    Description copied from interface: Digest
    
    close the digest, producing the final digest value. The doFinal call leaves the digest reset.
    
    Specified by:
    
    doFinal in interface Digest
    
    Parameters:
    
    out - the array the digest is to be copied into.
    
    outOff - the offset into the out array the digest is to start at.
  - reset
```
public void reset()
```
    reset the chaining variables
    
    Specified by:
    
    reset in interface Digest
    
    Overrides:
    
    reset in class GeneralDigest
  - processBlock
```
protected void processBlock()
```
    Specified by:
    
    processBlock in class GeneralDigest
  - copy
```
public Memoable copy()
```
    Description copied from interface: Memoable
    
    Produce a copy of this object with its configuration and in its current state.
    The returned object may be used simply to store the state, or may be used as a similar object starting from the copied state.
    
    Specified by:
    
    copy in interface Memoable
  - reset
```
public void reset(Memoable other)
```
    Description copied from interface: Memoable
    
    Restore a copied object state into this object.
    Implementations of this method should try to avoid or minimise memory allocation to perform the reset.
    
    Specified by:
    
    reset in interface Memoable
    
    Parameters:
    
    other - an object originally copied from an object of the same type as this instance.
  - getEncodedState
```
public byte[] getEncodedState()
```
    Description copied from interface: EncodableDigest
    
    Return an encoded byte array for the digest's internal state
    
    Specified by:
    
    getEncodedState in interface EncodableDigest
    
    Returns:
    
    an encoding of the digests internal state.

Class SHA256Digest

Constructor Summary

Method Summary

Methods inherited from class org.bouncycastle.crypto.digests.GeneralDigest

Methods inherited from class java.lang.Object

Constructor Detail

SHA256Digest

SHA256Digest

SHA256Digest

Method Detail

getAlgorithmName

getDigestSize

processWord

processLength

doFinal

reset

processBlock

copy

reset

getEncodedState