org.spongycastle.crypto.tls

Class Chacha20Poly1305

java.lang.Object

org.spongycastle.crypto.tls.Chacha20Poly1305

All Implemented Interfaces:

TlsCipher

public class Chacha20Poly1305
extends java.lang.Object
implements TlsCipher

draft-ietf-tls-chacha20-poly1305-04

Field Summary

Fields

Modifier and Type	Field and Description
protected TlsContext	context
protected ChaCha7539Engine	decryptCipher
protected byte[]	decryptIV
protected ChaCha7539Engine	encryptCipher
protected byte[]	encryptIV

Constructor Summary

Constructors

Constructor and Description
Chacha20Poly1305(TlsContext context)

Method Summary

Modifier and Type	Method and Description
protected byte[]	calculateNonce(long seqNo, byte[] iv)
protected byte[]	calculateRecordMAC(KeyParameter macKey, byte[] additionalData, byte[] buf, int off, int len)
byte[]	decodeCiphertext(long seqNo, short type, byte[] ciphertext, int offset, int len)
byte[]	encodePlaintext(long seqNo, short type, byte[] plaintext, int offset, int len)
protected KeyParameter	generateRecordMACKey(StreamCipher cipher)
protected byte[]	getAdditionalData(long seqNo, short type, int len)
int	getPlaintextLimit(int ciphertextLimit)
protected KeyParameter	initRecord(StreamCipher cipher, boolean forEncryption, long seqNo, byte[] iv)
protected void	updateRecordMACLength(Mac mac, int len)
protected void	updateRecordMACText(Mac mac, byte[] buf, int off, int len)

Methods inherited from class java.lang.Object

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

Field Detail

context

protected TlsContext context

encryptCipher

protected ChaCha7539Engine encryptCipher

decryptCipher

protected ChaCha7539Engine decryptCipher

encryptIV

protected byte[] encryptIV

decryptIV

protected byte[] decryptIV

Constructor Detail

Chacha20Poly1305

public Chacha20Poly1305(TlsContext context)
                 throws java.io.IOException

Throws:

java.io.IOException

Method Detail

getPlaintextLimit

public int getPlaintextLimit(int ciphertextLimit)

Specified by:

getPlaintextLimit in interface TlsCipher

encodePlaintext

public byte[] encodePlaintext(long seqNo,
                              short type,
                              byte[] plaintext,
                              int offset,
                              int len)
                       throws java.io.IOException

Specified by:

encodePlaintext in interface TlsCipher

Throws:

java.io.IOException

decodeCiphertext

public byte[] decodeCiphertext(long seqNo,
                               short type,
                               byte[] ciphertext,
                               int offset,
                               int len)
                        throws java.io.IOException

Specified by:

decodeCiphertext in interface TlsCipher

Throws:

java.io.IOException

initRecord

protected KeyParameter initRecord(StreamCipher cipher,
                                  boolean forEncryption,
                                  long seqNo,
                                  byte[] iv)

calculateNonce

protected byte[] calculateNonce(long seqNo,
                                byte[] iv)

generateRecordMACKey

protected KeyParameter generateRecordMACKey(StreamCipher cipher)

calculateRecordMAC

protected byte[] calculateRecordMAC(KeyParameter macKey,
                                    byte[] additionalData,
                                    byte[] buf,
                                    int off,
                                    int len)

updateRecordMACLength

protected void updateRecordMACLength(Mac mac,
                                     int len)

updateRecordMACText

protected void updateRecordMACText(Mac mac,
                                   byte[] buf,
                                   int off,
                                   int len)

getAdditionalData

protected byte[] getAdditionalData(long seqNo,
                                   short type,
                                   int len)
                            throws java.io.IOException

Throws:

java.io.IOException