Package com.southernstorm.noise.crypto.chacha20

Class ChaChaCore

java.lang.Object
com.southernstorm.noise.crypto.chacha20.ChaChaCore
public final class ChaChaCore extends Object
Implementation of the ChaCha20 core hash transformation.

  • Method Summary

    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.

    Methods inherited from class java.lang.Object

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

  • Method Details

    • 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