Package com.google.crypto.tink.aead.internal

Class InsecureNonceChaCha20

java.lang.Object

com.google.crypto.tink.aead.internal.InsecureNonceChaCha20

public class InsecureNonceChaCha20
extends java.lang.Object

A stream cipher, as described in RFC 8439 https://tools.ietf.org/html/rfc8439, section 2.4.

This cipher is meant to be used to construct an AEAD with Poly1305.

Constructor Summary

Constructors

Constructor	Description
InsecureNonceChaCha20(byte[] key, int initialCounter)

Method Summary

Modifier and Type	Method	Description
int[]	createInitialState(int[] nonce, int counter)
byte[]	decrypt(byte[] nonce, byte[] ciphertext)	Decrypts ciphertext using nonce.
byte[]	decrypt(byte[] nonce, java.nio.ByteBuffer ciphertext)	Decrypts ciphertext using nonce.
byte[]	encrypt(byte[] nonce, byte[] plaintext)	Encrypts plaintext using nonce.
void	encrypt(java.nio.ByteBuffer output, byte[] nonce, byte[] plaintext)	Encrypts plaintext using nonce and writes result to output.
int	nonceSizeInBytes()

Methods inherited from class java.lang.Object

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

Constructor Detail

InsecureNonceChaCha20

public InsecureNonceChaCha20(byte[] key,
                             int initialCounter)
                      throws java.security.InvalidKeyException

Throws:

java.security.InvalidKeyException

Method Detail

createInitialState

public int[] createInitialState(int[] nonce,
                                int counter)

nonceSizeInBytes

public int nonceSizeInBytes()

encrypt

public byte[] encrypt(byte[] nonce,
                      byte[] plaintext)
               throws java.security.GeneralSecurityException

Encrypts plaintext using nonce.

Throws:

java.security.GeneralSecurityException

encrypt

public void encrypt(java.nio.ByteBuffer output,
                    byte[] nonce,
                    byte[] plaintext)
             throws java.security.GeneralSecurityException

Encrypts plaintext using nonce and writes result to output.

Throws:

java.security.GeneralSecurityException

decrypt

public byte[] decrypt(byte[] nonce,
                      byte[] ciphertext)
               throws java.security.GeneralSecurityException

Decrypts ciphertext using nonce.

Throws:

java.security.GeneralSecurityException

decrypt

public byte[] decrypt(byte[] nonce,
                      java.nio.ByteBuffer ciphertext)
               throws java.security.GeneralSecurityException

Decrypts ciphertext using nonce.

Throws:

java.security.GeneralSecurityException