Package fr.cryptohash

Class MD2

  • All Implemented Interfaces:
    Digest
    public class MD2
extends DigestEngine

    This class implements the MD2 digest algorithm under the Digest API, using the DigestEngine class. MD4 is described in RFC 1319.

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 Copyright (c) 2007-2010  Projet RNRT SAPHIR
 
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 ===========================(LICENSE END)=============================
    Version:
    $Revision: 214 $
    Author:
    Thomas Pornin <thomas.pornin@cryptolog.com>

    • Constructor Detail

      • MD2

        public MD2()
        Create the object.

    • Method Detail

      • copy

        public Digest copy()
        Description copied from interface: Digest
        Clone the current state. The returned object evolves independantly of this object.
        Returns:
        the clone
        See Also:
        Digest

      • getDigestLength

        public int getDigestLength()
        Description copied from interface: Digest
        Get the natural hash function output length (in bytes).
        Returns:
        the digest output length (in bytes)
        See Also:
        Digest

      • getBlockLength

        public int getBlockLength()
        Description copied from interface: Digest

        Return the "block length" for the hash function. This value is naturally defined for iterated hash functions (Merkle-Damgard). It is used in HMAC (that's what the HMAC specification names the "B" parameter).

        If the function is "block-less" then this function may return -n where n is an integer such that the block length for HMAC ("B") will be inferred from the key length, by selecting the smallest multiple of n which is no smaller than the key length. For instance, for the Fugue-xxx hash functions, this function returns -4: the virtual block length B is the HMAC key length, rounded up to the next multiple of 4.

        Returns:
        the internal block length (in bytes), or -n
        See Also:
        Digest

      • doPadding

        protected void doPadding​(byte[] output,
                         int outputOffset)
        Description copied from class: DigestEngine
        Perform the final padding and store the result in the provided buffer. This method shall call DigestEngine.flush() and then DigestEngine.update(byte) with the appropriate padding data in order to get the full input data.
        Specified by:
        doPadding in class DigestEngine
        Parameters:
        output - the output buffer
        outputOffset - the output offset
        See Also:
        DigestEngine

      • doInit

        protected void doInit()
        Description copied from class: DigestEngine
        This function is called at object creation time; the implementation should use it to perform initialization tasks. After this method is called, the implementation should be ready to process data or meaningfully honour calls such as Digest.getDigestLength().
        Specified by:
        doInit in class DigestEngine
        See Also:
        DigestEngine

      • processBlock

        protected void processBlock​(byte[] data)
        Description copied from class: DigestEngine
        Process one block of data.
        Specified by:
        processBlock in class DigestEngine
        Parameters:
        data - the data block
        See Also:
        DigestEngine

      • toString

        public String toString()
        Description copied from interface: Digest

        Get the display name for this function (e.g. "SHA-1" for SHA-1).

        Specified by:
        toString in interface Digest
        Overrides:
        toString in class Object
        See Also:
        Digest