Package com.itextpdf.bouncycastlefips.crypto.modes

Class GCMBlockCipherBCFips

java.lang.Object
com.itextpdf.bouncycastlefips.crypto.modes.GCMBlockCipherBCFips
All Implemented Interfaces:
IGCMBlockCipher
public class GCMBlockCipherBCFips extends Object implements IGCMBlockCipher
This class provides the functionality of a cryptographic cipher of aes-gcm for encryption and decryption via wrapping and correctly populating Cipher class.

  • Constructor Summary

    Constructors
    Constructor
    Description
    GCMBlockCipherBCFips(Cipher cipher)
    Creates new aes-gcm block cipher class.

  • Method Summary

    Modifier and Type
    Method
    Description
    void
    doFinal(byte[] plainText, int i)
    Finishes a multiple-part encryption or decryption operation, depending on how this cipher was initialized.
    boolean
    equals(Object o)
    Cipher
    getCipher()
    Gets actual aes-gcm cipher being wrapped.
    int
    getOutputSize(int len)
    Returns the length in bytes that an output buffer would need to be in order to hold the result of the next doFinal operation, given the input length (in bytes).
    int
    getUpdateOutputSize(int len)
    Returns the length in bytes that an output buffer would need to be in order to hold the result of the next update operation, given the input length (in bytes).
    int
    hashCode()
    void
    init(boolean forEncryption, byte[] key, int macSizeBits, byte[] iv)
    Initialize this cipher with a key and a set of algorithm parameters.
    void
    processBytes(byte[] input, int inputOffset, int len, byte[] output, int outOffset)
    Perform a multiple-part encryption or decryption operation (depending on how this cipher was initialized), processing another data part.
    String
    toString()

    Methods inherited from class java.lang.Object

    clone, finalize, getClass, notify, notifyAll, wait, wait, wait

  • Constructor Details

    • GCMBlockCipherBCFips

      public GCMBlockCipherBCFips (Cipher cipher)
      Creates new aes-gcm block cipher class.
      Parameters:
      cipher - crypto instance to populate for aes-gcm encryption

  • Method Details

    • getCipher

      public Cipher getCipher()
      Gets actual aes-gcm cipher being wrapped.
      Returns:
      wrapped Cipher

    • init

      public void init (boolean forEncryption, byte[] key, int macSizeBits, byte[] iv) throws GeneralSecurityException
      Initialize this cipher with a key and a set of algorithm parameters.
      Specified by:
      init in interface IGCMBlockCipher
      Parameters:
      forEncryption - true to use encrypt mode, false to use decrypt mode
      key - the encryption key
      macSizeBits - MAC size, MAC sizes from 32 bits to 128 bits (must be a multiple of 8)
      iv - the IV source buffer
      Throws:
      GeneralSecurityException - in case any error during encryption or decryption

    • getUpdateOutputSize

      public int getUpdateOutputSize (int len)
      Returns the length in bytes that an output buffer would need to be in order to hold the result of the next update operation, given the input length (in bytes).
      Specified by:
      getUpdateOutputSize in interface IGCMBlockCipher
      Parameters:
      len - input length (in bytes)
      Returns:
      output length in bytes

    • processBytes

      public void processBytes (byte[] input, int inputOffset, int len, byte[] output, int outOffset) throws GeneralSecurityException
      Perform a multiple-part encryption or decryption operation (depending on how this cipher was initialized), processing another data part.
      Specified by:
      processBytes in interface IGCMBlockCipher
      Parameters:
      input - the input buffer
      inputOffset - the offset in input where the input starts
      len - the input length
      output - the buffer for the result
      outOffset - the offset in output where the result is stored
      Throws:
      GeneralSecurityException - in case any error during encryption or decryption

    • getOutputSize

      public int getOutputSize (int len)
      Returns the length in bytes that an output buffer would need to be in order to hold the result of the next doFinal operation, given the input length (in bytes).
      Specified by:
      getOutputSize in interface IGCMBlockCipher
      Parameters:
      len - input length (in bytes)
      Returns:
      output length in bytes

    • doFinal

      public void doFinal (byte[] plainText, int i) throws GeneralSecurityException
      Finishes a multiple-part encryption or decryption operation, depending on how this cipher was initialized. Input data that may have been buffered during a previous update operation is processed, also the authentication tag is appended in the case of encryption, or verified in the case of decryption.
      Specified by:
      doFinal in interface IGCMBlockCipher
      Parameters:
      plainText - the buffer for the result
      i - the offset in output where the result is stored
      Throws:
      GeneralSecurityException - in case any error during encryption or decryption

    • equals

      public boolean equals (Object o)
      Overrides:
      equals in class Object

    • hashCode

      public int hashCode()
      Overrides:
      hashCode in class Object

    • toString

      public String toString()
      Overrides:
      toString in class Object