Package com.southernstorm.noise.crypto

Class ChaChaCore

java.lang.Object

com.southernstorm.noise.crypto.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	initKey128(int[] output, byte[] key, int offset)	Initializes a ChaCha20 block with a 128-bit key.
static void	initKey256(int[] output, byte[] key, int offset)	Initializes a ChaCha20 block with a 256-bit key.

Methods inherited from class java.lang.Object

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

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.

initKey128

public static void initKey128(int[] output,
                              byte[] key,
                              int offset)

Initializes a ChaCha20 block with a 128-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.

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.