Package com.itextpdf.bouncycastle.crypto.modes

Class GCMBlockCipherBC

  • All Implemented Interfaces:
    IGCMBlockCipher
    public class GCMBlockCipherBC
extends java.lang.Object
implements IGCMBlockCipher
    This class provides the functionality of a cryptographic cipher of aes-gcm for encryption and decryption via wrapping the corresponding GCMBlockCipher class from bouncy-castle.

    • Field Summary

      Fields 
      Modifier and Type Field Description
      private org.bouncycastle.crypto.modes.GCMBlockCipher cipher  

    • Constructor Summary

      Constructors 
      Constructor Description
      GCMBlockCipherBC​(org.bouncycastle.crypto.modes.GCMBlockCipher cipher)
      Creates new wrapper for GCMBlockCipher aes-gcm block cipher class.

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      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​(java.lang.Object o)
      org.bouncycastle.crypto.modes.GCMBlockCipher getCipher()
      Gets actual org.bouncycastle object 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.
      java.lang.String toString()

      • Methods inherited from class java.lang.Object

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

    • Field Detail

      • cipher

        private final org.bouncycastle.crypto.modes.GCMBlockCipher cipher

    • Constructor Detail

      • GCMBlockCipherBC

        public GCMBlockCipherBC​(org.bouncycastle.crypto.modes.GCMBlockCipher cipher)
        Creates new wrapper for GCMBlockCipher aes-gcm block cipher class.
        Parameters:
        cipher - bouncy-castle class to wrap

    • Method Detail

      • getCipher

        public org.bouncycastle.crypto.modes.GCMBlockCipher getCipher()
        Gets actual org.bouncycastle object being wrapped.
        Returns:
        wrapped GCMBlockCipher

      • init

        public void init​(boolean forEncryption,
                 byte[] key,
                 int macSizeBits,
                 byte[] iv)
        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

      • 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)
        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

      • 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)
        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

      • equals

        public boolean equals​(java.lang.Object o)
        Overrides:
        equals in class java.lang.Object

      • hashCode

        public int hashCode()
        Overrides:
        hashCode in class java.lang.Object

      • toString

        public java.lang.String toString()
        Overrides:
        toString in class java.lang.Object