org.bouncycastle.crypto

public Interface Xof

Known Direct Implementers: org.bouncycastle.crypto.macs.KMAC, org.bouncycastle.crypto.digests.AsconXof, org.bouncycastle.crypto.digests.Blake2xsDigest, org.bouncycastle.crypto.digests.Blake3Digest, org.bouncycastle.crypto.digests.Kangaroo.KangarooBase, org.bouncycastle.crypto.digests.ParallelHash, org.bouncycastle.crypto.digests.SHAKEDigest, org.bouncycastle.crypto.digests.TupleHash

With FIPS PUB 202 a new kind of message digest was announced which supported extendable output, or variable digest sizes. This interface provides the extra method required to support variable output on an extended digest implementation.

Method Summary

Modifier and Type	Method and Description
public int	Returns: the number of bytes written doFinal(byte[] output array to write the output bytes to. out, int offset to start writing the bytes at. outOff, int the number of output bytes requested. outLen) Output the results of the final calculation for this digest to outLen number of bytes.
public int	Returns: the number of bytes written doOutput(byte[] output array to write the output bytes to. out, int offset to start writing the bytes at. outOff, int the number of output bytes requested. outLen) Start outputting the results of the final calculation for this digest.

Inherited from org.bouncycastle.crypto.ExtendedDigest:: getByteLength

Method Detail

doFinal	back to summary
public int doFinal(byte[] out, int outOff, int outLen) Output the results of the final calculation for this digest to outLen number of bytes. Parameters out:byte[] output array to write the output bytes to. outOff:int offset to start writing the bytes at. outLen:int the number of output bytes requested. Returns:int the number of bytes written

doFinal

back to summary

public int doFinal(byte[] out, int outOff, int outLen)

Output the results of the final calculation for this digest to outLen number of bytes.

Parameters

out:byte[]: output array to write the output bytes to.
outOff:int: offset to start writing the bytes at.
outLen:int: the number of output bytes requested.

Returns:int

the number of bytes written

doOutput	back to summary
public int doOutput(byte[] out, int outOff, int outLen) Start outputting the results of the final calculation for this digest. Unlike doFinal, this method will continue producing output until the Xof is explicitly reset, or signals otherwise. Parameters out:byte[] output array to write the output bytes to. outOff:int offset to start writing the bytes at. outLen:int the number of output bytes requested. Returns:int the number of bytes written

doOutput

back to summary

public int doOutput(byte[] out, int outOff, int outLen)

Start outputting the results of the final calculation for this digest. Unlike doFinal, this method will continue producing output until the Xof is explicitly reset, or signals otherwise.

Parameters

out:byte[]: output array to write the output bytes to.
outOff:int: offset to start writing the bytes at.
outLen:int: the number of output bytes requested.

Returns:int

the number of bytes written