org.spongycastle.tls.crypto.impl

Class TlsAEADCipher

java.lang.Object

org.spongycastle.tls.crypto.impl.TlsAEADCipher

All Implemented Interfaces:

TlsCipher

public class TlsAEADCipher
extends java.lang.Object
implements TlsCipher

A generic TLS 1.2 AEAD cipher.

Field Summary

Fields

Modifier and Type	Field and Description
protected TlsCryptoParameters	cryptoParams
protected TlsAEADCipherImpl	decryptCipher
protected byte[]	decryptImplicitNonce
protected TlsAEADCipherImpl	encryptCipher
protected byte[]	encryptImplicitNonce
protected int	macSize
static int	NONCE_RFC5288
static int	NONCE_RFC7905
protected int	nonceMode
protected int	record_iv_length

Constructor Summary

Constructors

Constructor and Description
TlsAEADCipher(TlsCryptoParameters cryptoParams, TlsAEADCipherImpl encryptCipher, TlsAEADCipherImpl decryptCipher, int cipherKeySize, int macSize)
TlsAEADCipher(TlsCryptoParameters cryptoParams, TlsAEADCipherImpl encryptCipher, TlsAEADCipherImpl decryptCipher, int cipherKeySize, int macSize, int nonceMode)

Method Summary

Modifier and Type	Method and Description
byte[]	decodeCiphertext(long seqNo, short type, byte[] ciphertext, int offset, int len) Validate and decrypt the passed in cipher text using the current cipher suite.
byte[]	encodePlaintext(long seqNo, short type, byte[] plaintext, int offset, int len) Encrypt and MAC the passed in plain text using the current cipher suite.
protected byte[]	getAdditionalData(long seqNo, short type, int len)
int	getPlaintextLimit(int ciphertextLimit) Return the maximum size for the plaintext given ciphertextlimit bytes of ciphertext.

Methods inherited from class java.lang.Object

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

Field Detail

NONCE_RFC5288

public static final int NONCE_RFC5288

See Also:

Constant Field Values

NONCE_RFC7905

public static final int NONCE_RFC7905

See Also:

Constant Field Values

cryptoParams

protected final TlsCryptoParameters cryptoParams

macSize

protected final int macSize

record_iv_length

protected final int record_iv_length

decryptCipher

protected final TlsAEADCipherImpl decryptCipher

encryptCipher

protected final TlsAEADCipherImpl encryptCipher

encryptImplicitNonce

protected final byte[] encryptImplicitNonce

decryptImplicitNonce

protected final byte[] decryptImplicitNonce

nonceMode

protected final int nonceMode

Constructor Detail

TlsAEADCipher

public TlsAEADCipher(TlsCryptoParameters cryptoParams,
                     TlsAEADCipherImpl encryptCipher,
                     TlsAEADCipherImpl decryptCipher,
                     int cipherKeySize,
                     int macSize)
              throws java.io.IOException

Throws:

java.io.IOException

TlsAEADCipher

public TlsAEADCipher(TlsCryptoParameters cryptoParams,
                     TlsAEADCipherImpl encryptCipher,
                     TlsAEADCipherImpl decryptCipher,
                     int cipherKeySize,
                     int macSize,
                     int nonceMode)
              throws java.io.IOException

Throws:

java.io.IOException

Method Detail

getPlaintextLimit

public int getPlaintextLimit(int ciphertextLimit)

Description copied from interface: TlsCipher

Return the maximum size for the plaintext given ciphertextlimit bytes of ciphertext.

Specified by:

getPlaintextLimit in interface TlsCipher

Parameters:

ciphertextLimit - the maximum number of bytes of ciphertext.

Returns:

the maximum size of the plaintext for ciphertextlimit bytes of input.

encodePlaintext

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

Description copied from interface: TlsCipher

Encrypt and MAC the passed in plain text using the current cipher suite.

Specified by:

encodePlaintext in interface TlsCipher

Parameters:

seqNo - sequence number of the message represented by plaintext.

type - content type of the message represented by plaintext.

plaintext - array holding input plain text to the cipher.

offset - offset into input array the plain text starts at.

len - length of the plaintext in the array.

Returns:

the resulting cipher text.

Throws:

java.io.IOException

decodeCiphertext

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

Description copied from interface: TlsCipher

Validate and decrypt the passed in cipher text using the current cipher suite.

Specified by:

decodeCiphertext in interface TlsCipher

Parameters:

seqNo - sequence number of the message represented by ciphertext.

type - content type of the message represented by ciphertext.

ciphertext - array holding input cipher text to the cipher.

offset - offset into input array the cipher text starts at.

len - length of the cipher text in the array.

Returns:

the resulting plaintext.

Throws:

java.io.IOException

getAdditionalData

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

Throws:

java.io.IOException