Package org.bouncycastle.crypto.modes

Class CCMBlockCipher

java.lang.Object
org.bouncycastle.crypto.modes.CCMBlockCipher
All Implemented Interfaces:
AEADBlockCipher
public class CCMBlockCipher
extends Object
implements AEADBlockCipher
Implements the Counter with Cipher Block Chaining mode (CCM) detailed in NIST Special Publication 800-38C.

Note: this mode is a packet mode - it needs all the data up front.

  • Constructor Summary

    Constructors
    Constructor Description
    CCMBlockCipher​(BlockCipher c)
    Basic constructor.

  • 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.
    String getAlgorithmName()
    Return the name of the algorithm.
    byte[] getMac()
    Returns a byte array containing the mac calculated as part of the last encrypt or decrypt operation.
    int getOutputSize​(int len)
    return the size of the output buffer required for a processBytes plus a doFinal with an input of len bytes.
    BlockCipher getUnderlyingCipher()
    return the underlying block cipher that we are wrapping.
    int getUpdateOutputSize​(int len)
    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.
    void processAADByte​(byte in)
    Add a single byte to the associated data check.
    void processAADBytes​(byte[] in, 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[] in, int inOff, int inLen, byte[] out, int outOff)
    process a block of bytes from in putting the result into out.
    byte[] processPacket​(byte[] in, int inOff, int inLen)  
    void reset()
    Reset the cipher.

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Constructor Details

    • CCMBlockCipher

      public CCMBlockCipher​(BlockCipher c)
      Basic constructor.
      Parameters:
      c - the block cipher to be used.

  • Method Details

    • getUnderlyingCipher

      public BlockCipher getUnderlyingCipher()
      return the underlying block cipher that we are wrapping.
      Specified by:
      getUnderlyingCipher in interface AEADBlockCipher
      Returns:
      the underlying block cipher that we are wrapping.

    • init

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

    • getAlgorithmName

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

    • processAADByte

      public void processAADByte​(byte in)
      Description copied from interface: AEADBlockCipher
      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.
      Specified by:
      processAADByte in interface AEADBlockCipher
      Parameters:
      in - the byte to be processed.

    • processAADBytes

      public void processAADBytes​(byte[] in, int inOff, int len)
      Description copied from interface: AEADBlockCipher
      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.
      Specified by:
      processAADBytes in interface AEADBlockCipher
      Parameters:
      in - 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.

    • processByte

      public int processByte​(byte in, byte[] out, int outOff) throws DataLengthException, IllegalStateException
      Description copied from interface: AEADBlockCipher
      encrypt/decrypt a single byte.
      Specified by:
      processByte in interface AEADBlockCipher
      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.
      IllegalStateException

    • processBytes

      public int processBytes​(byte[] in, int inOff, int inLen, byte[] out, int outOff) throws DataLengthException, IllegalStateException
      Description copied from interface: AEADBlockCipher
      process a block of bytes from in putting the result into out.
      Specified by:
      processBytes in interface AEADBlockCipher
      Parameters:
      in - the input byte array.
      inOff - the offset into the in array where the data to be processed starts.
      inLen - the number of bytes to be processed.
      out - 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.
      IllegalStateException

    • doFinal

      public int doFinal​(byte[] out, int outOff) throws IllegalStateException, InvalidCipherTextException
      Description copied from interface: AEADBlockCipher
      Finish the operation either appending or verifying the MAC at the end of the data.
      Specified by:
      doFinal in interface AEADBlockCipher
      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.

    • reset

      public void reset()
      Description copied from interface: AEADBlockCipher
      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 AEADBlockCipher

    • getMac

      public byte[] getMac()
      Returns a byte array containing the mac calculated as part of the last encrypt or decrypt operation.
      Specified by:
      getMac in interface AEADBlockCipher
      Returns:
      the last mac calculated.

    • getUpdateOutputSize

      public int getUpdateOutputSize​(int len)
      Description copied from interface: AEADBlockCipher
      return the size of the output buffer required for a processBytes an input of len bytes.
      Specified by:
      getUpdateOutputSize in interface AEADBlockCipher
      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: AEADBlockCipher
      return the size of the output buffer required for a processBytes plus a doFinal with an input of len bytes.
      Specified by:
      getOutputSize in interface AEADBlockCipher
      Parameters:
      len - the length of the input.
      Returns:
      the space required to accommodate a call to processBytes and doFinal with len bytes of input.

    • processPacket

      public byte[] processPacket​(byte[] in, int inOff, int inLen) throws IllegalStateException, InvalidCipherTextException
      Throws:
      IllegalStateException
      InvalidCipherTextException