org.bouncycastle.crypto.tls

Class TlsBlockCipher

java.lang.Object

org.bouncycastle.crypto.tls.TlsBlockCipher

All Implemented Interfaces:

TlsCipher

public class TlsBlockCipher
extends java.lang.Object
implements TlsCipher

A generic TLS 1.0-1.2 / SSLv3 block cipher. This can be used for AES or 3DES for example.

Field Summary

Fields

Modifier and Type	Field and Description
protected TlsContext	context
protected BlockCipher	decryptCipher
protected BlockCipher	encryptCipher
protected boolean	encryptThenMAC
protected byte[]	randomData
protected TlsMac	readMac
protected boolean	useExplicitIV
protected TlsMac	writeMac

Constructor Summary

Constructors

Constructor and Description
TlsBlockCipher(TlsContext context, BlockCipher clientWriteCipher, BlockCipher serverWriteCipher, Digest clientWriteDigest, Digest serverWriteDigest, int cipherKeySize)

Method Summary

Methods

Modifier and Type	Method and Description
protected int	checkPaddingConstantTime(byte[] buf, int off, int len, int blockSize, int macSize)
protected int	chooseExtraPadBlocks(java.security.SecureRandom r, int max)
byte[]	decodeCiphertext(long seqNo, short type, byte[] ciphertext, int offset, int len)
byte[]	encodePlaintext(long seqNo, short type, byte[] plaintext, int offset, int len)
int	getPlaintextLimit(int ciphertextLimit)
TlsMac	getReadMac()
TlsMac	getWriteMac()
protected int	lowestBitSet(int x)

Methods inherited from class java.lang.Object

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

Field Detail

context

protected TlsContext context

randomData

protected byte[] randomData

useExplicitIV

protected boolean useExplicitIV

encryptThenMAC

protected boolean encryptThenMAC

encryptCipher

protected BlockCipher encryptCipher

decryptCipher

protected BlockCipher decryptCipher

writeMac

protected TlsMac writeMac

readMac

protected TlsMac readMac

Constructor Detail

TlsBlockCipher

public TlsBlockCipher(TlsContext context,
              BlockCipher clientWriteCipher,
              BlockCipher serverWriteCipher,
              Digest clientWriteDigest,
              Digest serverWriteDigest,
              int cipherKeySize)
               throws java.io.IOException

Throws:

java.io.IOException

Method Detail

getWriteMac

public TlsMac getWriteMac()

getReadMac

public TlsMac getReadMac()

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)

Specified by:

encodePlaintext in interface TlsCipher

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

checkPaddingConstantTime

protected int checkPaddingConstantTime(byte[] buf,
                           int off,
                           int len,
                           int blockSize,
                           int macSize)

chooseExtraPadBlocks

protected int chooseExtraPadBlocks(java.security.SecureRandom r,
                       int max)

lowestBitSet

protected int lowestBitSet(int x)