org.bouncycastle.crypto.digests
Class ShortenedDigest
java.lang.Object
org.bouncycastle.crypto.digests.ShortenedDigest
- Digest, ExtendedDigest
public class ShortenedDigest
extends java.lang.Object
Wrapper class that reduces the output length of a particular digest to
only the first n bytes of the digest function.
int | doFinal(byte[] out, int outOff) - close the digest, producing the final digest value.
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String | getAlgorithmName() - return the algorithm name
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int | getByteLength()
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int | getDigestSize() - return the size, in bytes, of the digest produced by this message digest.
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void | reset() - reset the digest back to it's initial state.
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void | update(byte in) - update the message digest with a single byte.
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void | update(byte[] in, int inOff, int len) - update the message digest with a block of bytes.
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ShortenedDigest
public ShortenedDigest(ExtendedDigest baseDigest,
int length)
Base constructor.
baseDigest
- underlying digest to use.length
- length in bytes of the output of doFinal.
doFinal
public int doFinal(byte[] out,
int outOff)
close the digest, producing the final digest value. The doFinal
call leaves the digest reset.
- doFinal in interface Digest
out
- the array the digest is to be copied into.outOff
- the offset into the out array the digest is to start at.
getAlgorithmName
public String getAlgorithmName()
return the algorithm name
- getAlgorithmName in interface Digest
getDigestSize
public int getDigestSize()
return the size, in bytes, of the digest produced by this message digest.
- getDigestSize in interface Digest
- the size, in bytes, of the digest produced by this message digest.
reset
public void reset()
reset the digest back to it's initial state.
- reset in interface Digest
update
public void update(byte in)
update the message digest with a single byte.
- update in interface Digest
in
- the input byte to be entered.
update
public void update(byte[] in,
int inOff,
int len)
update the message digest with a block of bytes.
- update in interface Digest
in
- the byte array containing the data.inOff
- the offset into the byte array where the data starts.len
- the length of the data.