Package com.southernstorm.noise.crypto.chacha20

Class ChaChaCore

  • public final class ChaChaCore
extends Object
    Implementation of the ChaCha20 core hash transformation.

    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method Description
      static void hash​(int[] output, int[] input)
      Hashes an input block with ChaCha20.
      static void initIV​(int[] output, long iv)
      Initializes the 64-bit initialization vector in a ChaCha20 block.
      static void initIV​(int[] output, long iv, long counter)
      Initializes the 64-bit initialization vector and counter in a ChaCha20 block.
      static void initKey256​(int[] output, byte[] key, int offset)
      Initializes a ChaCha20 block with a 256-bit key.
      static void xorBlock​(byte[] input, int inputOffset, byte[] output, int outputOffset, int length, int[] block)
      XOR's the output of ChaCha20 with a byte buffer.

    • Method Detail

      • hash

        public static void hash​(int[] output,
                        int[] input)
        Hashes an input block with ChaCha20.
        Parameters:
        output - The output block, which must contain at least 16 elements and must not overlap with the input.
        input - The input block, which must contain at least 16 elements.

      • initKey256

        public static void initKey256​(int[] output,
                              byte[] key,
                              int offset)
        Initializes a ChaCha20 block with a 256-bit key.
        Parameters:
        output - The output block, which must consist of at least 16 words.
        key - The buffer containing the key.
        offset - Offset of the key in the buffer.

      • initIV

        public static void initIV​(int[] output,
                          long iv)
        Initializes the 64-bit initialization vector in a ChaCha20 block.
        Parameters:
        output - The output block, which must consist of at least 16 words and must have been initialized by initKey256() or initKey128().
        iv - The 64-bit initialization vector value. The counter portion of the output block is set to zero.

      • initIV

        public static void initIV​(int[] output,
                          long iv,
                          long counter)
        Initializes the 64-bit initialization vector and counter in a ChaCha20 block.
        Parameters:
        output - The output block, which must consist of at least 16 words and must have been initialized by initKey256() or initKey128().
        iv - The 64-bit initialization vector value.
        counter - The 64-bit counter value.

      • xorBlock

        public static void xorBlock​(byte[] input,
                            int inputOffset,
                            byte[] output,
                            int outputOffset,
                            int length,
                            int[] block)
        XOR's the output of ChaCha20 with a byte buffer.
        Parameters:
        input - The input byte buffer.
        inputOffset - The offset of the first input byte.
        output - The output byte buffer (can be the same as the input).
        outputOffset - The offset of the first output byte.
        length - The number of bytes to XOR between 1 and 64.
        block - The ChaCha20 output block.
        Since:
        0.9.39 moved from ChaChaPolyCipherState