Class SHA1Digest
- java.lang.Object
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- org.gudy.bouncycastle.crypto.digests.GeneralDigest
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- org.gudy.bouncycastle.crypto.digests.SHA1Digest
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- All Implemented Interfaces:
Digest
public class SHA1Digest extends GeneralDigest
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 "endienness" of the word processing!
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Constructor Summary
Constructors Constructor Description SHA1Digest()
Standard constructorSHA1Digest(SHA1Digest t)
Copy constructor.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description int
doFinal(byte[] out, int outOff)
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)
java.lang.String
getAlgorithmName()
return the algorithm nameint
getDigestSize()
return the size, in bytes, of the digest produced by this message digest.private int
h(int u, int v, int w)
protected void
processBlock()
protected void
processLength(long bitLength)
protected void
processWord(byte[] in, int inOff)
void
reset()
reset the chaining variablesprivate int
rotateLeft(int x, int n)
private void
unpackWord(int word, byte[] out, int outOff)
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Methods inherited from class org.gudy.bouncycastle.crypto.digests.GeneralDigest
finish, update, update
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Field Detail
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DIGEST_LENGTH
private static final int DIGEST_LENGTH
- See Also:
- Constant Field Values
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H1
private int H1
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H2
private int H2
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H3
private int H3
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H4
private int H4
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H5
private int H5
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X
private int[] X
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xOff
private int xOff
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Y1
private static final int Y1
- See Also:
- Constant Field Values
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Y2
private static final int Y2
- See Also:
- Constant Field Values
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Y3
private static final int Y3
- See Also:
- Constant Field Values
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Y4
private static final int Y4
- See Also:
- Constant Field Values
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Constructor Detail
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SHA1Digest
public SHA1Digest()
Standard constructor
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SHA1Digest
public SHA1Digest(SHA1Digest t)
Copy constructor. This will copy the state of the provided message digest.
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Method Detail
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getAlgorithmName
public java.lang.String getAlgorithmName()
Description copied from interface:Digest
return the algorithm name- Returns:
- the algorithm name
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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.
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processWord
protected void processWord(byte[] in, int inOff)
- Specified by:
processWord
in classGeneralDigest
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unpackWord
private void unpackWord(int word, byte[] out, int outOff)
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processLength
protected void processLength(long bitLength)
- Specified by:
processLength
in classGeneralDigest
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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.
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reset
public void reset()
reset the chaining variables- Specified by:
reset
in interfaceDigest
- Overrides:
reset
in classGeneralDigest
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f
private int f(int u, int v, int w)
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h
private int h(int u, int v, int w)
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g
private int g(int u, int v, int w)
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rotateLeft
private int rotateLeft(int x, int n)
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processBlock
protected void processBlock()
- Specified by:
processBlock
in classGeneralDigest
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