GiftCofbEngine (Bouncy Castle Library 1.86 API Specification)

java.lang.Object
- org.bouncycastle.crypto.engines.GiftCofbEngine

All Implemented Interfaces:

AEADCipher
```
public class GiftCofbEngine
extends java.lang.Object
```
GIFT-COFB v1.1, based on the current round 3 submission, https://www.isical.ac.in/~lightweight/COFB/ Reference C implementation: https://csrc.nist.gov/CSRC/media/Projects/lightweight-cryptography/documents/finalist-round/updated-submissions/elephant.zip Specification: https://csrc.nist.gov/CSRC/media/Projects/lightweight-cryptography/documents/finalist-round/updated-spec-doc/gift-cofb-spec-final.pdf

Nested Class Summary

Nested Classes
Modifier and Type	Class and Description
`protected static interface`	`AEADBaseEngine.AADOperator`
`protected static class`	`AEADBaseEngine.AADOperatorType`
`protected static class`	`AEADBaseEngine.DataLimitCounter` Enforces the AEAD confidentiality / data limit (q) of draft-irtf-cfrg-aead-limits sec. 5/6: it bounds the total bytes processed under one key (nonce + AAD + message), throwing once 2^n is exceeded.
`protected static interface`	`AEADBaseEngine.DataOperator`
`protected static class`	`AEADBaseEngine.DataOperatorType`
`protected static class`	`AEADBaseEngine.DecryptionFailureCounter` Enforces the AEAD integrity limit (v) of draft-irtf-cfrg-aead-limits sec. 5/6: it bounds the number of failed decryptions (forgery attempts) permitted under one key, with the bound derived from the authentication-tag length (a shorter tag lowers the limit).
`protected static class`	`AEADBaseEngine.ErasableOutputStream`
`protected static class`	`AEADBaseEngine.ProcessingBufferType`
`protected static class`	`AEADBaseEngine.State`
`protected static class`	`AEADBaseEngine.StreamAADOperator`

Field Summary

Fields
Modifier and Type	Field and Description
`protected int`	`AADBufferSize`
`protected AEADBaseEngine.AADOperator`	`aadOperator`
`protected java.lang.String`	`algorithmName`
`protected int`	`BlockSize`
`protected AEADBaseEngine.DataLimitCounter`	`dataLimitCounter`
`protected AEADBaseEngine.DataOperator`	`dataOperator`
`protected AEADBaseEngine.DecryptionFailureCounter`	`decryptionFailureCounter`
`protected boolean`	`forEncryption`
`protected byte[]`	`initialAssociatedText`
`protected int`	`IV_SIZE`
`protected int`	`KEY_SIZE`
`protected byte[]`	`m_aad`
`protected int`	`m_aadPos`
`protected byte[]`	`m_buf`
`protected int`	`m_bufferSizeDecrypt`
`protected int`	`m_bufPos`
`protected AEADBaseEngine.State`	`m_state`
`protected byte[]`	`mac`
`protected int`	`MAC_SIZE`
`protected int`	`macSizeLowerBound`
`protected org.bouncycastle.crypto.engines.AEADBaseEngine.AADProcessingBuffer`	`processor`

Constructor Summary

Constructors
Constructor and Description

GiftCofbEngine()

Constructors
Constructor and Description
`GiftCofbEngine()`

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`protected void`	`checkAAD()`
`protected boolean`	`checkData(boolean isDoFinal)`
`int`	`doFinal(byte[] output, int outOff)` Finish the operation either appending or verifying the MAC at the end of the data.
`protected void`	`ensureInitialized()`
`protected void`	`ensureSufficientInputBuffer(byte[] input, int inOff, int len)`
`protected void`	`ensureSufficientOutputBuffer(byte[] output, int outOff, int len)`
`protected void`	`finishAAD(AEADBaseEngine.State nextState, boolean isDoFinal)`
`protected void`	`finishAAD1(AEADBaseEngine.State nextState)`
`protected void`	`finishAAD2(AEADBaseEngine.State nextState)`
`protected void`	`finishAAD3(AEADBaseEngine.State nextState, boolean isDoFinal)`
`java.lang.String`	`getAlgorithmName()` Return the name of the algorithm.
`int`	`getBlockSize()`
`int`	`getIVBytesSize()`
`int`	`getKeyBytesSize()`
`byte[]`	`getMac()` 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.
`protected int`	`getTotalBytesForUpdate(int len)`
`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.
`protected void`	`init(byte[] key, byte[] iv)`
`void`	`processAADByte(byte input)` 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.
`protected void`	`processBufferAAD(byte[] in, int inOff)`
`protected void`	`processBufferDecrypt(byte[] inputM, int inOff, byte[] output, int outOff)`
`protected void`	`processBufferEncrypt(byte[] inputM, int inOff, byte[] output, int outOff)`
`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.
`protected int`	`processEncDecByte(byte[] output, int outOff)`
`protected int`	`processEncDecBytes(byte[] input, int inOff, int len, byte[] output, int outOff)`
`protected void`	`processFinalAAD()`
`protected void`	`processFinalBlock(byte[] output, int outOff)`
`void`	`reset()` Reset the cipher.
`protected void`	`reset(boolean clearMac)`
`protected void`	`setInnerMembers(AEADBaseEngine.ProcessingBufferType type, AEADBaseEngine.AADOperatorType aadOperatorType, AEADBaseEngine.DataOperatorType dataOperatorType)`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - forEncryption
```
protected boolean forEncryption
```
  - algorithmName
```
protected java.lang.String algorithmName
```
  - KEY_SIZE
```
protected int KEY_SIZE
```
  - IV_SIZE
```
protected int IV_SIZE
```
  - MAC_SIZE
```
protected int MAC_SIZE
```
  - macSizeLowerBound
```
protected int macSizeLowerBound
```
  - initialAssociatedText
```
protected byte[] initialAssociatedText
```
  - mac
```
protected byte[] mac
```
  - m_buf
```
protected byte[] m_buf
```
  - m_aad
```
protected byte[] m_aad
```
  - m_bufPos
```
protected int m_bufPos
```
  - m_aadPos
```
protected int m_aadPos
```
  - AADBufferSize
```
protected int AADBufferSize
```
  - BlockSize
```
protected int BlockSize
```
  - m_state
```
protected AEADBaseEngine.State m_state
```
  - m_bufferSizeDecrypt
```
protected int m_bufferSizeDecrypt
```
  - processor
```
protected org.bouncycastle.crypto.engines.AEADBaseEngine.AADProcessingBuffer processor
```
  - aadOperator
```
protected AEADBaseEngine.AADOperator aadOperator
```
  - dataOperator
```
protected AEADBaseEngine.DataOperator dataOperator
```
  - decryptionFailureCounter
```
protected AEADBaseEngine.DecryptionFailureCounter decryptionFailureCounter
```
  - dataLimitCounter
```
protected AEADBaseEngine.DataLimitCounter dataLimitCounter
```
- Constructor Detail
  - GiftCofbEngine
```
public GiftCofbEngine()
```
- Method Detail
  - processBufferAAD
```
protected void processBufferAAD(byte[] in,
                                int inOff)
```
  - processFinalAAD
```
protected void processFinalAAD()
```
  - finishAAD
```
protected void finishAAD(AEADBaseEngine.State nextState,
                         boolean isDoFinal)
```
  - init
```
protected void init(byte[] key,
                    byte[] iv)
```
  - processFinalBlock
```
protected void processFinalBlock(byte[] output,
                                 int outOff)
```
  - processBufferEncrypt
```
protected void processBufferEncrypt(byte[] inputM,
                                    int inOff,
                                    byte[] output,
                                    int outOff)
```
  - processBufferDecrypt
```
protected void processBufferDecrypt(byte[] inputM,
                                    int inOff,
                                    byte[] output,
                                    int outOff)
```
  - reset
```
protected void reset(boolean clearMac)
```
  - getAlgorithmName
```
public java.lang.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.
  - 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.
  - 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
  - setInnerMembers
```
protected void setInnerMembers(AEADBaseEngine.ProcessingBufferType type,
                               AEADBaseEngine.AADOperatorType aadOperatorType,
                               AEADBaseEngine.DataOperatorType dataOperatorType)
```
  - processAADByte
```
public void processAADByte(byte input)
```
    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.
    
    Specified by:
    
    processAADByte in interface AEADCipher
    
    Parameters:
    
    input - 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.
    
    Specified by:
    
    processAADBytes in interface AEADCipher
    
    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.
  - 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.
  - processEncDecByte
```
protected int processEncDecByte(byte[] output,
                                int outOff)
```
  - 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.
    
    Specified by:
    
    processBytes in interface AEADCipher
    
    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.
  - processEncDecBytes
```
protected int processEncDecBytes(byte[] input,
                                 int inOff,
                                 int len,
                                 byte[] output,
                                 int outOff)
```
  - doFinal
```
public int doFinal(byte[] output,
                   int outOff)
            throws java.lang.IllegalStateException,
                   InvalidCipherTextException
```
    Description copied from interface: AEADCipher
    
    Finish the operation either appending or verifying the MAC at the end of the data.
    
    Specified by:
    
    doFinal in interface AEADCipher
    
    Parameters:
    
    output - space for any resulting output data.
    
    outOff - offset into out to start copying the data at.
    
    Returns:
    
    number of bytes written into out.
    
    Throws:
    
    java.lang.IllegalStateException - if the cipher is in an inappropriate state.
    
    InvalidCipherTextException - if the MAC fails to match.
  - getBlockSize
```
public final int getBlockSize()
```
  - 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.
    
    Specified by:
    
    getUpdateOutputSize in interface AEADCipher
    
    Parameters:
    
    len - the length of the input.
    
    Returns:
    
    the space required to accommodate a call to processBytes with len bytes of input.
  - getTotalBytesForUpdate
```
protected int getTotalBytesForUpdate(int len)
```
  - 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).
    
    Specified by:
    
    getOutputSize in interface AEADCipher
    
    Parameters:
    
    len - the length of the input.
    
    Returns:
    
    the space required to accommodate a call to processBytes and doFinal with len bytes of input.
  - checkAAD
```
protected void checkAAD()
```
  - checkData
```
protected boolean checkData(boolean isDoFinal)
```
  - ensureSufficientOutputBuffer
```
protected final void ensureSufficientOutputBuffer(byte[] output,
                                                  int outOff,
                                                  int len)
```
  - ensureSufficientInputBuffer
```
protected final void ensureSufficientInputBuffer(byte[] input,
                                                 int inOff,
                                                 int len)
```
  - ensureInitialized
```
protected final void ensureInitialized()
```
  - finishAAD1
```
protected void finishAAD1(AEADBaseEngine.State nextState)
```
  - finishAAD2
```
protected void finishAAD2(AEADBaseEngine.State nextState)
```
  - finishAAD3
```
protected void finishAAD3(AEADBaseEngine.State nextState,
                          boolean isDoFinal)
```

Class GiftCofbEngine

Nested Class Summary

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

forEncryption

algorithmName

KEY_SIZE

IV_SIZE

MAC_SIZE

macSizeLowerBound

initialAssociatedText

mac

m_buf

m_aad

m_bufPos

m_aadPos

AADBufferSize

BlockSize

m_state

m_bufferSizeDecrypt

processor

aadOperator

dataOperator

decryptionFailureCounter

dataLimitCounter

Constructor Detail

GiftCofbEngine

Method Detail

processBufferAAD

processFinalAAD

finishAAD

init

processFinalBlock

processBufferEncrypt

processBufferDecrypt

reset

getAlgorithmName

getKeyBytesSize

getIVBytesSize

getMac

init

reset

setInnerMembers

processAADByte

processAADBytes

processByte

processEncDecByte

processBytes

processEncDecBytes

doFinal

getBlockSize

getUpdateOutputSize

getTotalBytesForUpdate

getOutputSize

checkAAD

checkData

ensureSufficientOutputBuffer

ensureSufficientInputBuffer

ensureInitialized

finishAAD1

finishAAD2

finishAAD3