Top Description Fields Constructors Methods
org.bouncycastle.crypto.digests

public Class SHA1Digest

extends GeneralDigest
implements EncodableDigest
Class Inheritance
All Implemented Interfaces
org.bouncycastle.crypto.digests.EncodableDigest
Imports
org.bouncycastle.crypto.CryptoServiceProperties, .CryptoServicePurpose, .CryptoServicesRegistrar, org.bouncycastle.util.Memoable, .Pack
implementation of SHA-1 as outlined in "Handbook of Applied Cryptography", pages 346 - 349. It is interesting to ponder why the, apart from the extra IV, the other difference here from MD5 is the "endianness" of the word processing!

Field Summary

Modifier and TypeField and Description
private static final int
DIGEST_LENGTH

private int
H1

private int
H2

private int
H3

private int
H4

private int
H5

private int[]
X

private int
xOff

private static final int
Y1

private static final int
Y2

private static final int
Y3

private static final int
Y4

Inherited from org.bouncycastle.crypto.digests.GeneralDigest:
purpose

Constructor Summary

AccessConstructor and Description
public
SHA1Digest()

Standard constructor

public
SHA1Digest(CryptoServicePurpose purpose)

Standard constructor, with Purpose

public
SHA1Digest(SHA1Digest t)

Copy constructor.

public
SHA1Digest(byte[]
the encoded state from the originating digest.
encodedState)

State constructor - create a digest initialised with the state of a previous one.

Method Summary

Modifier and TypeMethod and Description
public Memoable
copy()

Implements org.bouncycastle.util.Memoable.copy.

Produce a copy of this object with its configuration and in its current state.
private void
copyIn(SHA1Digest t)

protected CryptoServiceProperties
cryptoServiceProperties()

Implements abstract org.bouncycastle.crypto.digests.GeneralDigest.cryptoServiceProperties.

public int
doFinal(byte[]
the array the digest is to be copied into.
out, int
the offset into the out array the digest is to start at.
outOff)

Implements org.bouncycastle.crypto.Digest.doFinal.

close the digest, producing the final digest value.
private int
f(int u, int v, int w)

private int
g(int u, int v, int w)

public String
getAlgorithmName()

Implements org.bouncycastle.crypto.Digest.getAlgorithmName.

return the algorithm name
public int
getDigestSize()

Implements org.bouncycastle.crypto.Digest.getDigestSize.

return the size, in bytes, of the digest produced by this message digest.
public byte[]
getEncodedState()

Implements org.bouncycastle.crypto.digests.EncodableDigest.getEncodedState.

Return an encoded byte array for the digest's internal state
private int
h(int u, int v, int w)

protected void
processBlock()

Implements abstract org.bouncycastle.crypto.digests.GeneralDigest.processBlock.

protected void
processLength(long bitLength)

Implements abstract org.bouncycastle.crypto.digests.GeneralDigest.processLength.

protected void
processWord(byte[] in, int inOff)

Implements abstract org.bouncycastle.crypto.digests.GeneralDigest.processWord.

public void
reset()

Overrides org.bouncycastle.crypto.digests.GeneralDigest.reset.

Implements org.bouncycastle.crypto.Digest.reset.

reset the chaining variables
public void
reset(Memoable
an object originally copied from an object of the same type as this instance.
other)

Implements org.bouncycastle.util.Memoable.reset.

Restore a copied object state into this object.
Inherited from org.bouncycastle.crypto.digests.GeneralDigest:
copyInfinishgetByteLengthpopulateStateupdateupdate

Field Detail

DIGEST_LENGTHback to summary
private static final int DIGEST_LENGTH
H1back to summary
private int H1
H2back to summary
private int H2
H3back to summary
private int H3
H4back to summary
private int H4
H5back to summary
private int H5
Xback to summary
private int[] X
xOffback to summary
private int xOff
Y1back to summary
private static final int Y1
Y2back to summary
private static final int Y2
Y3back to summary
private static final int Y3
Y4back to summary
private static final int Y4

Constructor Detail

SHA1Digestback to summary
public SHA1Digest()

Standard constructor

SHA1Digestback to summary
public SHA1Digest(CryptoServicePurpose purpose)

Standard constructor, with Purpose

SHA1Digestback to summary
public SHA1Digest(SHA1Digest t)

Copy constructor. This will copy the state of the provided message digest.

SHA1Digestback to summary
public SHA1Digest(byte[] encodedState)

State constructor - create a digest initialised with the state of a previous one.

Parameters
encodedState:byte[]

the encoded state from the originating digest.

Method Detail

copyback to summary
public Memoable copy()

Implements org.bouncycastle.util.Memoable.copy.

Doc from org.bouncycastle.util.Memoable.copy.

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.

copyInback to summary
private void copyIn(SHA1Digest t)
cryptoServicePropertiesback to summary
protected CryptoServiceProperties cryptoServiceProperties()

Implements abstract org.bouncycastle.crypto.digests.GeneralDigest.cryptoServiceProperties.

doFinalback to summary
public int doFinal(byte[] out, int outOff)

Implements org.bouncycastle.crypto.Digest.doFinal.

Doc from org.bouncycastle.crypto.Digest.doFinal.

close the digest, producing the final digest value. The doFinal call leaves the digest reset.

Parameters
out:byte[]

the array the digest is to be copied into.

outOff:int

the offset into the out array the digest is to start at.

fback to summary
private int f(int u, int v, int w)
gback to summary
private int g(int u, int v, int w)
getAlgorithmNameback to summary
public String getAlgorithmName()

Implements org.bouncycastle.crypto.Digest.getAlgorithmName.

Doc from org.bouncycastle.crypto.Digest.getAlgorithmName.

return the algorithm name

Returns:String

the algorithm name

getDigestSizeback to summary
public int getDigestSize()

Implements org.bouncycastle.crypto.Digest.getDigestSize.

Doc from org.bouncycastle.crypto.Digest.getDigestSize.

return the size, in bytes, of the digest produced by this message digest.

Returns:int

the size, in bytes, of the digest produced by this message digest.

getEncodedStateback to summary
public byte[] getEncodedState()

Implements org.bouncycastle.crypto.digests.EncodableDigest.getEncodedState.

Doc from org.bouncycastle.crypto.digests.EncodableDigest.getEncodedState.

Return an encoded byte array for the digest's internal state

Returns:byte[]

an encoding of the digests internal state.

hback to summary
private int h(int u, int v, int w)
processBlockback to summary
protected void processBlock()

Implements abstract org.bouncycastle.crypto.digests.GeneralDigest.processBlock.

processLengthback to summary
protected void processLength(long bitLength)

Implements abstract org.bouncycastle.crypto.digests.GeneralDigest.processLength.

processWordback to summary
protected void processWord(byte[] in, int inOff)

Implements abstract org.bouncycastle.crypto.digests.GeneralDigest.processWord.

resetback to summary
public void reset()

Overrides org.bouncycastle.crypto.digests.GeneralDigest.reset.

Implements org.bouncycastle.crypto.Digest.reset.

reset the chaining variables

resetback to summary
public void reset(Memoable other)

Implements org.bouncycastle.util.Memoable.reset.

Doc from org.bouncycastle.util.Memoable.reset.

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:Memoable

an object originally copied from an object of the same type as this instance.