Package org.bouncycastle.crypto

Interface Xof

  • All Superinterfaces:
    Digest, ExtendedDigest
    All Known Implementing Classes:
    Blake2xsDigest, CSHAKEDigest, KMAC, SHAKEDigest
    public interface Xof
extends ExtendedDigest
    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 Detail

      • doFinal

        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 - output array to write the output bytes to.
        outOff - offset to start writing the bytes at.
        outLen - the number of output bytes requested.
        Returns:
        the number of bytes written

      • doOutput

        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 - output array to write the output bytes to.
        outOff - offset to start writing the bytes at.
        outLen - the number of output bytes requested.
        Returns:
        the number of bytes written