Class AESCBCNoPadding

java.lang.Object
javax.crypto.CipherSpi
com.ibm.crypto.hdwrCCA.provider.AESCBCNoPadding
public final class AESCBCNoPadding extends CipherSpi
This class implements the AES algorithm with CBC mode of operation and padding scheme NoPadding.

This documentation describes a Service Provider Interface. It is provided for implementation insight only. This class is not intended to be called directly by application developers. Please consult the 'Java Cryptography Architecture Standard' for details on how to use this interface through a public standard class.

  • Constructor Summary

    Constructors
    Constructor
    Description
    AESCBCNoPadding()
    Creates an instance of an AES cipher with CBC mode and NoPadding.

  • Method Summary

    Modifier and Type
    Method
    Description
    protected byte[]
    engineDoFinal(byte[] input, int inputOffset, int inputLen)
    Encrypts or decrypts data in a single-part operation, or finishes a multiple-part operation.
    protected int
    engineDoFinal(byte[] input, int inputOffset, int inputLen, byte[] output, int outputOffset)
    Encrypts or decrypts data in a single-part operation, or finishes a multiple-part operation.
    protected int
    engineGetBlockSize()
    Returns the block size in bytes.
    protected byte[]
    engineGetIV()
    Returns the initialization vector (IV) in a new buffer.
    protected int
    engineGetKeySize(Key key)
    Returns the key size of the given key object.
    protected int
    engineGetOutputSize(int inputLen)
    Returns the length in bytes that an output buffer would need to be in order to hold the result of the next update or doFinal operation, given the input length inputLen (in bytes).
    protected AlgorithmParameters
    engineGetParameters()
    Returns the parameters used with this cipher.
    protected void
    engineInit(int opmode, Key key, AlgorithmParameters params, SecureRandom random)
    Initializes this cipher with a key, a set of algorithm parameters, and a source of randomness.
    protected void
    engineInit(int opmode, Key key, SecureRandom random)
    Initializes this cipher with a key and a source of randomness.
    protected void
    engineInit(int opmode, Key key, AlgorithmParameterSpec params, SecureRandom random)
    Initializes this cipher with a key, a set of algorithm parameters, and a source of randomness.
    protected void
    engineSetMode(String mode)
    Sets the mode of this cipher.
    protected void
    engineSetPadding(String paddingScheme)
    Sets the padding mechanism of this cipher.
    protected Key
    engineUnwrap(byte[] wrappedKey, String wrappedKeyAlgorithm, int wrappedKeyType)
    Unwrap a previously wrapped key.
    protected byte[]
    engineUpdate(byte[] input, int inputOffset, int inputLen)
    Continues a multiple-part encryption or decryption operation (depending on how this cipher was initialized), processing another data part.
    protected int
    engineUpdate(byte[] input, int inputOffset, int inputLen, byte[] output, int outputOffset)
    Continues a multiple-part encryption or decryption operation (depending on how this cipher was initialized), processing another data part.
    protected byte[]
    engineWrap(Key key)
    Wrap a key.

    Methods inherited from class CipherSpi

    engineDoFinal, engineUpdate, engineUpdateAAD, engineUpdateAAD

    Methods inherited from class Object

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

  • Constructor Details

    • AESCBCNoPadding

      public AESCBCNoPadding()
      Creates an instance of an AES cipher with CBC mode and NoPadding.

  • Method Details

    • engineSetMode

      protected void engineSetMode(String mode) throws NoSuchAlgorithmException
      Sets the mode of this cipher.
      Specified by:
      engineSetMode in class CipherSpi
      Parameters:
      mode - the cipher mode
      Throws:
      NoSuchAlgorithmException - if the requested cipher mode does not exist

    • engineSetPadding

      protected void engineSetPadding(String paddingScheme) throws NoSuchPaddingException
      Sets the padding mechanism of this cipher.
      Specified by:
      engineSetPadding in class CipherSpi
      Parameters:
      paddingScheme - the padding mechanism
      Throws:
      NoSuchPaddingException - if the requested padding mechanism does not exist

    • engineGetBlockSize

      protected int engineGetBlockSize()
      Returns the block size in bytes.
      Specified by:
      engineGetBlockSize in class CipherSpi
      Returns:
      the block size in bytes.

    • engineGetOutputSize

      protected int engineGetOutputSize(int inputLen)
      Returns the length in bytes that an output buffer would need to be in order to hold the result of the next update or doFinal operation, given the input length inputLen (in bytes).

      This call takes into account any unprocessed (buffered) data from a previous update call, and padding.

      The actual output length of the next update or doFinal call may be smaller than the length returned by this method.

      Specified by:
      engineGetOutputSize in class CipherSpi
      Parameters:
      inputLen - the input length (in bytes)
      Returns:
      the required output buffer size (in bytes).

    • engineGetIV

      protected byte[] engineGetIV()
      Returns the initialization vector (IV) in a new buffer.

      This is useful in the case where a random IV has been created (see engineInit(int, Key, SecureRandom)), or in the context of password-based encryption or decryption, where the IV is derived from a user-provided password.

      Specified by:
      engineGetIV in class CipherSpi
      Returns:
      the initialization vector in a new buffer, or null if the underlying algorithm does not use an IV, or if the IV has not yet been set.

    • engineGetParameters

      protected AlgorithmParameters engineGetParameters()
      Returns the parameters used with this cipher.

      The returned parameters may be the same that were used to initialize this cipher, or may contain the default set of parameters or a set of randomly generated parameters used by the underlying cipher implementation (provided that the underlying cipher implementation uses a default set of parameters or creates new parameters if it needs parameters but was not initialized with any).

      Specified by:
      engineGetParameters in class CipherSpi
      Returns:
      the parameters used with this cipher, or null if this cipher does not use any parameters.

    • engineInit

      protected void engineInit(int opmode, Key key, SecureRandom random) throws InvalidKeyException
      Initializes this cipher with a key and a source of randomness.

      The cipher is initialized for one of the following four operations: encryption, decryption, key wrapping or key unwrapping, depending on the value of opmode.

      If this cipher requires an initialization vector (IV), it will get it from random. This behaviour should only be used in encryption or key wrapping mode, however. When initializing a cipher that requires an IV for decryption or key unwrapping, the IV (same IV that was used for encryption or key wrapping) must be provided explicitly as a parameter, in order to get the correct result.

      This method also cleans existing buffer and other related state information.

      Specified by:
      engineInit in class CipherSpi
      Parameters:
      opmode - the operation mode of this cipher (this is one of the following: ENCRYPT_MODE, DECRYPT_MODE, WRAP_MODE or UNWRAP_MODE)
      key - the secret key
      random - the source of randomness
      Throws:
      InvalidKeyException - if the given key is inappropriate for initializing this cipher

    • engineInit

      protected void engineInit(int opmode, Key key, AlgorithmParameterSpec params, SecureRandom random) throws InvalidKeyException, InvalidAlgorithmParameterException
      Initializes this cipher with a key, a set of algorithm parameters, and a source of randomness.

      The cipher is initialized for one of the following four operations: encryption, decryption, key wrapping or key unwrapping, depending on the value of opmode.

      If this cipher (including its underlying feedback or padding scheme) requires any random bytes, it will get them from random.

      Specified by:
      engineInit in class CipherSpi
      Parameters:
      opmode - the operation mode of this cipher (this is one of the following: ENCRYPT_MODE, DECRYPT_MODE, WRAP_MODE or UNWRAP_MODE)
      key - the encryption key
      params - the algorithm parameters
      random - the source of randomness
      Throws:
      InvalidKeyException - if the given key is inappropriate for initializing this cipher
      InvalidAlgorithmParameterException - if the given algorithm parameters are inappropriate for this cipher

    • engineInit

      protected void engineInit(int opmode, Key key, AlgorithmParameters params, SecureRandom random) throws InvalidKeyException, InvalidAlgorithmParameterException
      Initializes this cipher with a key, a set of algorithm parameters, and a source of randomness.

      The cipher is initialized for one of the following four operations: encryption, decryption, key wrapping or key unwrapping, depending on the value of opmode.

      If this cipher (including its underlying feedback or padding scheme) requires any random bytes, it will get them from random.

      Specified by:
      engineInit in class CipherSpi
      Parameters:
      opmode - the operation mode of this cipher (this is one of the following: ENCRYPT_MODE, DECRYPT_MODE, WRAP_MODE or UNWRAP_MODE)
      key - the encryption key
      params - the algorithm parameters
      random - the source of randomness
      Throws:
      InvalidKeyException - if the given key is inappropriate for initializing this cipher
      InvalidAlgorithmParameterException - if the given algorithm parameters are inappropriate for this cipher

    • engineUpdate

      protected byte[] engineUpdate(byte[] input, int inputOffset, int inputLen)
      Continues a multiple-part encryption or decryption operation (depending on how this cipher was initialized), processing another data part.

      The first inputLen bytes in the input buffer, starting at inputOffset, are processed, and the result is stored in a new buffer.

      Specified by:
      engineUpdate in class CipherSpi
      Parameters:
      input - the input buffer
      inputOffset - the offset in input where the input starts
      inputLen - the input length
      Returns:
      the new buffer with the result.

    • engineUpdate

      protected int engineUpdate(byte[] input, int inputOffset, int inputLen, byte[] output, int outputOffset) throws ShortBufferException
      Continues a multiple-part encryption or decryption operation (depending on how this cipher was initialized), processing another data part.

      The first inputLen bytes in the input buffer, starting at inputOffset, are processed, and the result is stored in the output buffer, starting at outputOffset.

      Specified by:
      engineUpdate in class CipherSpi
      Parameters:
      input - the input buffer
      inputOffset - the offset in input where the input starts
      inputLen - the input length
      output - the buffer for the result
      outputOffset - the offset in output where the result is stored
      Returns:
      the number of bytes stored in output.
      Throws:
      ShortBufferException - if the given output buffer is too small to hold the result

    • engineDoFinal

      protected byte[] engineDoFinal(byte[] input, int inputOffset, int inputLen) throws IllegalBlockSizeException, BadPaddingException
      Encrypts or decrypts data in a single-part operation, or finishes a multiple-part operation. The data is encrypted or decrypted, depending on how this cipher was initialized.

      The first inputLen bytes in the input buffer, starting at inputOffset, and any input bytes that may have been buffered during a previous update operation, are processed, with padding (if requested) being applied. The result is stored in a new buffer.

      The cipher is reset to its initial state (uninitialized) after this call.

      Specified by:
      engineDoFinal in class CipherSpi
      Parameters:
      input - the input buffer
      inputOffset - the offset in input where the input starts
      inputLen - the input length
      Returns:
      the new buffer with the result.
      Throws:
      IllegalBlockSizeException - if this cipher is a block cipher, no padding has been requested (only in encryption mode), and the total input length of the data processed by this cipher is not a multiple of block size
      BadPaddingException - if this cipher is in decryption mode, and (un)padding has been requested, but the decrypted data is not bounded by the appropriate padding bytes

    • engineDoFinal

      protected int engineDoFinal(byte[] input, int inputOffset, int inputLen, byte[] output, int outputOffset) throws IllegalBlockSizeException, ShortBufferException, BadPaddingException
      Encrypts or decrypts data in a single-part operation, or finishes a multiple-part operation. The data is encrypted or decrypted, depending on how this cipher was initialized.

      The first inputLen bytes in the input buffer, starting at inputOffset, and any input bytes that may have been buffered during a previous update operation, are processed, with padding (if requested) being applied. The result is stored in the output buffer, starting at outputOffset.

      The cipher is reset to its initial state (uninitialized) after this call.

      Specified by:
      engineDoFinal in class CipherSpi
      Parameters:
      input - the input buffer
      inputOffset - the offset in input where the input starts
      inputLen - the input length
      output - the buffer for the result
      outputOffset - the offset in output where the result is stored
      Returns:
      the number of bytes stored in output.
      Throws:
      IllegalBlockSizeException - if this cipher is a block cipher, no padding has been requested (only in encryption mode), and the total input length of the data processed by this cipher is not a multiple of block size
      ShortBufferException - if the given output buffer is too small to hold the result
      BadPaddingException - if this cipher is in decryption mode, and (un)padding has been requested, but the decrypted data is not bounded by the appropriate padding bytes

    • engineGetKeySize

      protected int engineGetKeySize(Key key)
      Returns the key size of the given key object.
      Overrides:
      engineGetKeySize in class CipherSpi
      Parameters:
      key - the key object.
      Returns:
      the key size of the given key object as determined by the underlying AES cipher implementation.

    • engineWrap

      protected byte[] engineWrap(Key key) throws IllegalBlockSizeException, InvalidKeyException
      Wrap a key.
      Overrides:
      engineWrap in class CipherSpi
      Parameters:
      key - the key to be wrapped.
      Returns:
      the wrapped key.
      Throws:
      IllegalBlockSizeException - if this cipher is a block cipher, no padding has been requested, and the length of the encoding of the key to be wrapped is not a multiple of the block size.
      InvalidKeyException - if it is impossible or unsafe to wrap the key with this cipher (e.g., a hardware protected key is being passed to a software only cipher).

    • engineUnwrap

      protected Key engineUnwrap(byte[] wrappedKey, String wrappedKeyAlgorithm, int wrappedKeyType) throws InvalidKeyException, NoSuchAlgorithmException
      Unwrap a previously wrapped key.
      Overrides:
      engineUnwrap in class CipherSpi
      Parameters:
      wrappedKey - the key to be unwrapped.
      wrappedKeyAlgorithm - the algorithm the wrapped key is for.
      wrappedKeyType - the type of the wrapped key. This is one of Cipher.SECRET_KEY, Cipher.PRIVATE_KEY, or Cipher.PUBLIC_KEY.
      Returns:
      the unwrapped key.
      Throws:
      InvalidKeyException - if wrappedKey does not represent a wrapped key, or if the algorithm associated with the wrapped key is different from wrappedKeyAlgorithm and/or its key type is different from wrappedKeyType.
      NoSuchAlgorithmException - if no installed providers can create keys for the wrappedKeyAlgorithm.