SHA512Digest

java.lang.Object

org.bouncycastle.crypto.digests.LongDigest

org.bouncycastle.crypto.digests.SHA512Digest

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

public class SHA512Digestextends LongDigest

FIPS 180-2 implementation of SHA-512.

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

Field Summary
Fields
Modifier and Type
Field
Description
private static final int
DIGEST_LENGTH
Digest size in bytes.
Fields inherited from class LongDigest
H1, H2, H3, H4, H5, H6, H7, H8, K, purpose
Modifier and Type
Field
Description
protected long
H1
Hash working variables H1-H8.
protected long
H2
Hash working variables H1-H8.
protected long
H3
Hash working variables H1-H8.
protected long
H4
Hash working variables H1-H8.
protected long
H5
Hash working variables H1-H8.
protected long
H6
Hash working variables H1-H8.
protected long
H7
Hash working variables H1-H8.
protected long
H8
Hash working variables H1-H8.
(package private) static final long[]
K
SHA-384 and SHA-512 constants (first 64 bits of fractional parts of cube roots of first 64 primes)
protected final CryptoServicePurpose
purpose
Crypto operation purpose.
Constructor Summary
Constructors
Constructor
Description
SHA512Digest()
Standard constructor
SHA512Digest(byte[] encodedState)
State constructor - create a digest initialised with the state of a previous one.
SHA512Digest(CryptoServicePurpose purpose)
Standard constructor, with purpose
SHA512Digest(SHA512Digest t)
Copy constructor.
Method Summary
Public Methods
Modifier and Type
Method
Description
Memoable
copy()
Produce a copy of this object with its configuration and in its current state.
protected CryptoServiceProperties
cryptoServiceProperties()
Returns the properties for the crypto service.
int
doFinal(byte[] out, int outOff)
close the digest, producing the final digest value.
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
void
reset()
Reset the chaining variables
void
reset(Memoable other)
Restore a copied object state into this object.
Methods inherited from class LongDigest
copyIn, finish, getByteLength, getEncodedStateSize, populateState, processBlock, processLength, processWord, restoreState, update, update
Modifier and Type
Method
Description
protected void
copyIn(LongDigest t)
Takes over another digest's buffer and byte counts.
void
finish()
Pads the message to a block boundary and compresses the final block.
int
getByteLength()
Gets the digest length in bytes, 128 for a SHA-512 family digest.
protected int
getEncodedStateSize()
Returns the size of the encoded state.
protected void
populateState(byte[] state)
Writes this digest's buffer, counts and chaining values into a byte array.
protected void
processBlock()
Expands and mixes the 80-word schedule, then updates the chaining values.
protected void
processLength(long lowW, long hiW)
Process the bit length data.
protected void
processWord(byte[] in, int inOff)
Process a word of input data.
protected void
restoreState(byte[] encodedState)
Reads back a state previously written by LongDigest.populateState(byte[]).
void
update(byte in)
Updates the digest with one byte.
void
update(byte[] in, int inOff, int len)
Updates the digest with the given bytes.
Methods inherited from class Object
clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details
- DIGEST_LENGTH
  private static final int DIGEST_LENGTH
  Digest size in bytes.
  See Also:
  Constant Field Values
Constructor Details
- SHA512Digest
  public SHA512Digest()
  Standard constructor
- SHA512Digest
  public SHA512Digest(CryptoServicePurpose purpose)
  Standard constructor, with purpose
  Parameters:
  purpose - the CryptoServicePurpose to register this digest under.
- SHA512Digest
  public SHA512Digest(SHA512Digest t)
  Copy constructor. This will copy the state of the provided message digest.
  Parameters:
  t - the digest to copy the purpose and buffered state from.
- SHA512Digest
  public SHA512Digest(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 Details
- getAlgorithmName
  public String getAlgorithmName()
  Description copied from interface: Digest
  return the algorithm name
  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.
  Returns:
  the size, in bytes, of the digest produced by this message digest.
- 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.
  Parameters:
  out - the array the digest is to be copied into.
  outOff - the offset into the out array the digest is to start at.
  Returns:
  the number of bytes written to out, equal to the digest size in bytes.
- reset
  public void reset()
  Reset the chaining variables
  Specified by:
  reset in interface Digest
  Overrides:
  reset in class LongDigest
- 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.
  Returns:
  a copy of this object
- 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.
  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
  Returns:
  an encoding of the digests internal state.
- cryptoServiceProperties
  protected CryptoServiceProperties cryptoServiceProperties()
  Description copied from class: LongDigest
  Returns the properties for the crypto service.
  Specified by:
  cryptoServiceProperties in class LongDigest
  Returns:
  the crypto service properties

Field Summary

Fields inherited from class LongDigest

Constructor Summary

Method Summary

Methods inherited from class LongDigest

Methods inherited from class Object

Field Details

DIGEST_LENGTH

Constructor Details

SHA512Digest

SHA512Digest

SHA512Digest

Method Details

getAlgorithmName

getDigestSize

doFinal

reset

copy

reset

getEncodedState

cryptoServiceProperties