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

Class InsecureNonceChaCha20Poly1305Jce

java.lang.Object

com.google.crypto.tink.aead.internal.InsecureNonceChaCha20Poly1305Jce

@Immutable
public final class InsecureNonceChaCha20Poly1305Jce
extends java.lang.Object

Implements ChaCha20Poly1305, as described in RFC 8439, section 2.8.

It is similar to ChaCha20Poly1305Jce, but it offers an interface for the user to choose the nonce, which is needed in HPKE.

It uses the JCE, and requires that algorithm "ChaCha20-Poly1305" is present.

Method Summary

Modifier and Type	Method	Description
static InsecureNonceChaCha20Poly1305Jce	create(byte[] key)
byte[]	decrypt(byte[] nonce, byte[] ciphertext, byte[] associatedData)	Decrypts ciphertext with nonce and associatedData.
byte[]	decrypt(byte[] nonce, byte[] ciphertextWithPrefix, int ciphertextOffset, byte[] associatedData)	Decrypts ciphertextWithPrefix with nonce and associatedData.
byte[]	encrypt(byte[] nonce, byte[] plaintext, byte[] associatedData)	Encrypts plaintext with nonce and associatedData.
byte[]	encrypt(byte[] nonce, byte[] plaintext, int ciphertextOffset, byte[] associatedData)	Encrypts plaintext with nonce and associatedData.
static boolean	isSupported()

Methods inherited from class java.lang.Object

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

Method Detail

create

public static InsecureNonceChaCha20Poly1305Jce create(byte[] key)
                                               throws java.security.GeneralSecurityException

Throws:

java.security.GeneralSecurityException

isSupported

public static boolean isSupported()

encrypt

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

Encrypts plaintext with nonce and associatedData.

Throws:

java.security.GeneralSecurityException

encrypt

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

Encrypts plaintext with nonce and associatedData.

The ciphertextOffset is the offset at which the ciphertext will start in the returned byte array.

Throws:

java.security.GeneralSecurityException

decrypt

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

Decrypts ciphertext with nonce and associatedData.

Throws:

java.security.GeneralSecurityException

decrypt

public byte[] decrypt(byte[] nonce,
                      byte[] ciphertextWithPrefix,
                      int ciphertextOffset,
                      byte[] associatedData)
               throws java.security.GeneralSecurityException

Decrypts ciphertextWithPrefix with nonce and associatedData.

The ciphertextOffset is the offset at which the ciphertext starts in the ciphertextWithPrefix.

Throws:

java.security.GeneralSecurityException