Class Grain128AEADEngine

java.lang.Object
org.bouncycastle.crypto.engines.Grain128AEADEngine
All Implemented Interfaces:
AEADCipher

public class Grain128AEADEngine extends Object
Grain-128 AEAD, based on the current round 3 submission, https://grain-128aead.github.io/
  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    protected String
     
    protected boolean
     
    protected byte[]
     
    protected int
     
    protected int
     
    protected byte[]
     
    protected int
     
  • Constructor Summary

    Constructors
    Constructor
    Description
     
  • Method Summary

    Modifier and Type
    Method
    Description
    int
    doFinal(byte[] out, int outOff)
    Finish the operation either appending or verifying the MAC at the end of the data.
    Return the name of the algorithm.
    int
     
    int
     
    byte[]
    Return the value of the MAC associated with the last stream processed.
    int
    getOutputSize(int len)
    return the size of the output buffer required for a processBytes plus a doFinal with an input of len bytes.
    int
    return the size of the output buffer required for a processBytes an input of len bytes.
    void
    init(boolean forEncryption, CipherParameters params)
    initialise the underlying cipher.
    protected void
    init(byte[] key, byte[] iv)
    Initialize a Grain-128AEAD cipher.
    void
    processAADByte(byte in)
    Add a single byte to the associated data check.
    void
    processAADBytes(byte[] input, int inOff, int len)
    Add a sequence of bytes to the associated data check.
    int
    processByte(byte in, byte[] out, int outOff)
    encrypt/decrypt a single byte.
    int
    processBytes(byte[] input, int inOff, int len, byte[] output, int outOff)
    process a block of bytes from in putting the result into out.
    void
    Reset the cipher.
    protected void
    reset(boolean clearMac)
     

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
  • Field Details

    • forEncryption

      protected boolean forEncryption
    • algorithmName

      protected String algorithmName
    • KEY_SIZE

      protected int KEY_SIZE
    • IV_SIZE

      protected int IV_SIZE
    • MAC_SIZE

      protected int MAC_SIZE
    • initialAssociatedText

      protected byte[] initialAssociatedText
    • mac

      protected byte[] mac
  • Constructor Details

    • Grain128AEADEngine

      public Grain128AEADEngine()
  • Method Details

    • init

      protected void init(byte[] key, byte[] iv) throws IllegalArgumentException
      Initialize a Grain-128AEAD cipher.
      Throws:
      IllegalArgumentException - If the params argument is inappropriate.
    • processBytes

      public int processBytes(byte[] input, int inOff, int len, byte[] output, int outOff) throws DataLengthException
      Description copied from interface: AEADCipher
      process a block of bytes from in putting the result into out.
      Parameters:
      input - the input byte array.
      inOff - the offset into the in array where the data to be processed starts.
      len - the number of bytes to be processed.
      output - the output buffer the processed bytes go into.
      outOff - the offset into the output byte array the processed data starts at.
      Returns:
      the number of bytes written to out.
      Throws:
      DataLengthException - if the output buffer is too small.
    • reset

      protected void reset(boolean clearMac)
    • processAADByte

      public void processAADByte(byte in)
      Description copied from interface: AEADCipher
      Add a single byte to the associated data check.
      If the implementation supports it, this will be an online operation and will not retain the associated data.
      Parameters:
      in - the byte to be processed.
    • processAADBytes

      public void processAADBytes(byte[] input, int inOff, int len)
      Description copied from interface: AEADCipher
      Add a sequence of bytes to the associated data check.
      If the implementation supports it, this will be an online operation and will not retain the associated data.
      Parameters:
      input - the input byte array.
      inOff - the offset into the in array where the data to be processed starts.
      len - the number of bytes to be processed.
    • doFinal

      public int doFinal(byte[] out, int outOff) throws IllegalStateException, InvalidCipherTextException
      Description copied from interface: AEADCipher
      Finish the operation either appending or verifying the MAC at the end of the data.
      Parameters:
      out - space for any resulting output data.
      outOff - offset into out to start copying the data at.
      Returns:
      number of bytes written into out.
      Throws:
      IllegalStateException - if the cipher is in an inappropriate state.
      InvalidCipherTextException - if the MAC fails to match.
    • getUpdateOutputSize

      public int getUpdateOutputSize(int len)
      Description copied from interface: AEADCipher
      return the size of the output buffer required for a processBytes an input of len bytes.

      The returned size may be dependent on the initialisation of this cipher and may not be accurate once subsequent input data is processed - this method should be invoked immediately prior to input data being processed.

      Parameters:
      len - the length of the input.
      Returns:
      the space required to accommodate a call to processBytes with len bytes of input.
    • getOutputSize

      public int getOutputSize(int len)
      Description copied from interface: AEADCipher
      return the size of the output buffer required for a processBytes plus a doFinal with an input of len bytes.

      The returned size may be dependent on the initialisation of this cipher and may not be accurate once subsequent input data is processed - this method should be invoked immediately prior to a call to final processing of input data and a call to AEADCipher.doFinal(byte[], int).

      Parameters:
      len - the length of the input.
      Returns:
      the space required to accommodate a call to processBytes and doFinal with len bytes of input.
    • getAlgorithmName

      public String getAlgorithmName()
      Description copied from interface: AEADCipher
      Return the name of the algorithm.
      Specified by:
      getAlgorithmName in interface AEADCipher
      Returns:
      the algorithm name.
    • getKeyBytesSize

      public int getKeyBytesSize()
    • getIVBytesSize

      public int getIVBytesSize()
    • getMac

      public byte[] getMac()
      Description copied from interface: AEADCipher
      Return the value of the MAC associated with the last stream processed.
      Specified by:
      getMac in interface AEADCipher
      Returns:
      MAC for plaintext data.
    • reset

      public void reset()
      Description copied from interface: AEADCipher
      Reset the cipher. After resetting the cipher is in the same state as it was after the last init (if there was one).
      Specified by:
      reset in interface AEADCipher
    • processByte

      public int processByte(byte in, byte[] out, int outOff) throws DataLengthException
      Description copied from interface: AEADCipher
      encrypt/decrypt a single byte.
      Specified by:
      processByte in interface AEADCipher
      Parameters:
      in - the byte to be processed.
      out - the output buffer the processed byte goes into.
      outOff - the offset into the output byte array the processed data starts at.
      Returns:
      the number of bytes written to out.
      Throws:
      DataLengthException - if the output buffer is too small.
    • init

      public void init(boolean forEncryption, CipherParameters params)
      Description copied from interface: AEADCipher
      initialise the underlying cipher. Parameter can either be an AEADParameters or a ParametersWithIV object.
      Specified by:
      init in interface AEADCipher
      Parameters:
      forEncryption - true if we are setting up for encryption, false otherwise.
      params - the necessary parameters for the underlying cipher to be initialised.