SHA

java.lang.Object
- java.security.MessageDigestSpi
- - com.ibm.crypto.fips.provider.SHA

All Implemented Interfaces:

java.lang.Cloneable
```
public final class SHA
extends java.security.MessageDigestSpi
implements java.lang.Cloneable
```
This class implements the Secure Hash Algorithm (SHA) developed by the National Institute of Standards and Technology along with the National Security Agency. This is the updated version of SHA fip-180 as superseded by fip-180-1.

Constructor Summary

Constructors
Constructor and Description

SHA()
Standard constructor, creates a new SHA instance, allocates its buffers from the heap.

Constructors
Constructor and Description
`SHA()` Standard constructor, creates a new SHA instance, allocates its buffers from the heap.

Method Summary

Methods
Modifier and Type	Method and Description
`java.lang.Object`	`clone()` Clones this object.
`protected byte[]`	`engineDigest()`
`protected int`	`engineDigest(byte[] buf, int offset, int len)`
`protected int`	`engineGetDigestLength()` Return the digest length in bytes
`protected void`	`engineReset()`
`protected void`	`engineUpdate(byte b)` Update adds the passed byte to the digested data.
`protected void`	`engineUpdate(byte[] input, int offset, int len)` Update adds the selected part of an array of bytes to the digest.
`void`	`init()` Initialize the SHA information
`protected java.lang.Object`	`internalClone()` Clones this object.
`protected byte[]`	`internalDigest()`
`protected byte[]`	`internalDigest(byte[] buf)`
`protected int`	`internalDigest(byte[] buf, int offset, int len)`
`protected int`	`internalGetDigestLength()` Return the digest length in bytes
`protected void`	`internalInit()` Initialize the SHA information
`protected void`	`internalReset()`
`protected void`	`internalUpdate(byte b)` Update adds the passed byte to the digested data.
`protected void`	`internalUpdate(byte[] input, int offset, int len)` Update adds the selected part of an array of bytes to the digest.

Methods inherited from class java.security.MessageDigestSpi
engineUpdate

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

- Constructor Detail
  - SHA
```
public SHA()
```
    Standard constructor, creates a new SHA instance, allocates its buffers from the heap.
- Method Detail
  - init
```
public void init()
```
    Initialize the SHA information
    
    Throws:
    
    FIPSRuntimeException - if SelfTest.isFipsRunnable returns false.
  - internalInit
```
protected void internalInit()
```
    Initialize the SHA information
  - engineReset
```
protected void engineReset()
```
    Specified by:
    
    engineReset in class java.security.MessageDigestSpi
    
    Throws:
    
    FIPSRuntimeException - if SelfTest.isFipsRunnable returns false.
  - internalReset
```
protected void internalReset()
```
  - engineGetDigestLength
```
protected int engineGetDigestLength()
```
    Return the digest length in bytes
    
    Overrides:
    
    engineGetDigestLength in class java.security.MessageDigestSpi
    
    Throws:
    
    FIPSRuntimeException - if SelfTest.isFipsRunnable returns false.
  - internalGetDigestLength
```
protected int internalGetDigestLength()
```
    Return the digest length in bytes
  - engineUpdate
```
protected void engineUpdate(byte b)
```
    Update adds the passed byte to the digested data.
    
    Specified by:
    
    engineUpdate in class java.security.MessageDigestSpi
    
    Throws:
    
    FIPSRuntimeException - if SelfTest.isFipsRunnable returns false.
  - internalUpdate
```
protected void internalUpdate(byte b)
```
    Update adds the passed byte to the digested data.
  - engineUpdate
```
protected void engineUpdate(byte[] input,
                int offset,
                int len)
```
    Update adds the selected part of an array of bytes to the digest. This version is more efficient than the byte-at-a-time version; it avoids data copies and reduces per-byte call overhead.
    
    Specified by:
    
    engineUpdate in class java.security.MessageDigestSpi
    
    Throws:
    
    FIPSRuntimeException - if SelfTest.isFipsRunnable returns false.
  - internalUpdate
```
protected void internalUpdate(byte[] input,
                  int offset,
                  int len)
```
    Update adds the selected part of an array of bytes to the digest. This version is more efficient than the byte-at-a-time version; it avoids data copies and reduces per-byte call overhead.
  - engineDigest
```
protected byte[] engineDigest()
```
    Specified by:
    
    engineDigest in class java.security.MessageDigestSpi
    
    Throws:
    
    FIPSRuntimeException - if SelfTest.isFipsRunnable returns false.
  - internalDigest
```
protected byte[] internalDigest()
```
  - engineDigest
```
protected int engineDigest(byte[] buf,
               int offset,
               int len)
                    throws java.security.DigestException
```
    Overrides:
    
    engineDigest in class java.security.MessageDigestSpi
    
    Throws:
    
    FIPSRuntimeException - if SelfTest.isFipsRunnable returns false.
    
    java.security.DigestException
  - internalDigest
```
protected int internalDigest(byte[] buf,
                 int offset,
                 int len)
                      throws java.security.DigestException
```
    Throws:
    
    java.security.DigestException
  - internalDigest
```
protected byte[] internalDigest(byte[] buf)
                         throws java.security.DigestException
```
    Throws:
    
    java.security.DigestException
  - clone
```
public java.lang.Object clone()
```
    Clones this object.
    
    Overrides:
    
    clone in class java.security.MessageDigestSpi
    
    Throws:
    
    FIPSRuntimeException - if SelfTest.isFipsRunnable returns false.
  - internalClone
```
protected java.lang.Object internalClone()
```
    Clones this object.

Methods inherited from class java.security.MessageDigestSpi

Methods inherited from class java.lang.Object

SHA

init

internalInit

engineReset

internalReset

engineGetDigestLength

internalGetDigestLength

engineUpdate

internalUpdate

engineUpdate

internalUpdate

engineDigest

internalDigest

engineDigest

internalDigest

internalDigest

clone

internalClone