Package org.bouncycastle.tls.crypto.impl

Class TlsAEADCipher

java.lang.Object

org.bouncycastle.tls.crypto.impl.TlsAEADCipher

All Implemented Interfaces:

TlsCipher

public final class TlsAEADCipher
extends Object
implements TlsCipher

A generic TLS 1.2 AEAD cipher.

Field Summary

Fields

Modifier and Type	Field	Description
static final int	AEAD_CCM
static final int	AEAD_CHACHA20_POLY1305
static final int	AEAD_GCM

Constructor Summary

Constructors

Constructor	Description
TlsAEADCipher(TlsCryptoParameters cryptoParams, TlsAEADCipherImpl encryptCipher, TlsAEADCipherImpl decryptCipher, int keySize, int macSize, int aeadType)

Method Summary

Modifier and Type	Method	Description
TlsDecodeResult	decodeCiphertext(long seqNo, short recordType, ProtocolVersion recordVersion, byte[] ciphertext, int ciphertextOffset, int ciphertextLength)	Decode the passed in ciphertext using the current bulk cipher.
TlsEncodeResult	encodePlaintext(long seqNo, short contentType, ProtocolVersion recordVersion, int headerAllocation, byte[] plaintext, int plaintextOffset, int plaintextLength)	Encode the passed in plaintext using the current bulk cipher.
int	getCiphertextDecodeLimit(int plaintextLimit)	Return the maximum input size for a ciphertext given a maximum output size for the plaintext of plaintextLimit bytes.
int	getCiphertextEncodeLimit(int plaintextLimit)	Return the maximum output size for a ciphertext given a maximum input size for the plaintext of plaintextLimit bytes.
int	getPlaintextDecodeLimit(int ciphertextLimit)	Return the maximum output size for the plaintext given a maximum input size for the ciphertext of ciphertextLimit bytes.
int	getPlaintextEncodeLimit(int ciphertextLimit)	Return the maximum input size for the plaintext given a maximum output size for the ciphertext of ciphertextLimit bytes.
void	rekeyDecoder()
void	rekeyEncoder()
boolean	usesOpaqueRecordTypeDecode()
boolean	usesOpaqueRecordTypeEncode()

Methods inherited from class java.lang.Object

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

Field Details

AEAD_CCM

public static final int AEAD_CCM

See Also:

• Constant Field Values

AEAD_CHACHA20_POLY1305

public static final int AEAD_CHACHA20_POLY1305

See Also:

• Constant Field Values

AEAD_GCM

public static final int AEAD_GCM

See Also:

• Constant Field Values

Constructor Details

TlsAEADCipher

public TlsAEADCipher(TlsCryptoParameters cryptoParams,
 TlsAEADCipherImpl encryptCipher,
 TlsAEADCipherImpl decryptCipher,
 int keySize,
 int macSize,
 int aeadType)
              throws IOException

Throws:

IOException

Method Details

getCiphertextDecodeLimit

public int getCiphertextDecodeLimit(int plaintextLimit)

Description copied from interface: TlsCipher

Return the maximum input size for a ciphertext given a maximum output size for the plaintext of plaintextLimit bytes.

Specified by:

getCiphertextDecodeLimit in interface TlsCipher

Parameters:

plaintextLimit - the maximum output size for the plaintext.

Returns:

the maximum input size of the ciphertext for plaintextLimit bytes of output.

getCiphertextEncodeLimit

public int getCiphertextEncodeLimit(int plaintextLimit)

Description copied from interface: TlsCipher

Return the maximum output size for a ciphertext given a maximum input size for the plaintext of plaintextLimit bytes.

Specified by:

getCiphertextEncodeLimit in interface TlsCipher

Parameters:

plaintextLimit - the maximum input size for the plaintext.

Returns:

the maximum output size of the ciphertext for plaintextLimit bytes of input.

getPlaintextDecodeLimit

public int getPlaintextDecodeLimit(int ciphertextLimit)

Description copied from interface: TlsCipher

Return the maximum output size for the plaintext given a maximum input size for the ciphertext of ciphertextLimit bytes.

Specified by:

getPlaintextDecodeLimit in interface TlsCipher

Parameters:

ciphertextLimit - the maximum input size for the ciphertext.

Returns:

the maximum output size of the plaintext for ciphertextLimit bytes of input.

getPlaintextEncodeLimit

public int getPlaintextEncodeLimit(int ciphertextLimit)

Description copied from interface: TlsCipher

Return the maximum input size for the plaintext given a maximum output size for the ciphertext of ciphertextLimit bytes.

Specified by:

getPlaintextEncodeLimit in interface TlsCipher

Parameters:

ciphertextLimit - the maximum output size for the ciphertext.

Returns:

the maximum input size of the plaintext for ciphertextLimit bytes of output.

encodePlaintext

public TlsEncodeResult encodePlaintext(long seqNo,
 short contentType,
 ProtocolVersion recordVersion,
 int headerAllocation,
 byte[] plaintext,
 int plaintextOffset,
 int plaintextLength)
                                throws IOException

Description copied from interface: TlsCipher

Encode the passed in plaintext using the current bulk cipher.

Specified by:

encodePlaintext in interface TlsCipher

Parameters:

seqNo - sequence number of the message represented by plaintext.

contentType - content type of the message represented by plaintext.

recordVersion - ProtocolVersion used for the record.

headerAllocation - extra bytes to allocate at start of returned byte array.

plaintext - array holding input plaintext to the cipher.

plaintextOffset - offset into input array the plaintext starts at.

plaintextLength - length of the plaintext in the array.

Returns:

A TlsEncodeResult containing the result of encoding (after 'headerAllocation' unused bytes).

Throws:

IOException

decodeCiphertext

public TlsDecodeResult decodeCiphertext(long seqNo,
 short recordType,
 ProtocolVersion recordVersion,
 byte[] ciphertext,
 int ciphertextOffset,
 int ciphertextLength)
                                 throws IOException

Description copied from interface: TlsCipher

Decode the passed in ciphertext using the current bulk cipher.

Specified by:

decodeCiphertext in interface TlsCipher

Parameters:

seqNo - sequence number of the message represented by ciphertext.

recordType - content type used in the record for this message.

recordVersion - ProtocolVersion used for the record.

ciphertext - array holding input ciphertext to the cipher.

ciphertextOffset - offset into input array the ciphertext starts at.

ciphertextLength - length of the ciphertext in the array.

Returns:

A TlsDecodeResult containing the result of decoding.

Throws:

IOException

rekeyDecoder

public void rekeyDecoder()
                  throws IOException

Specified by:

rekeyDecoder in interface TlsCipher

Throws:

IOException

rekeyEncoder

public void rekeyEncoder()
                  throws IOException

Specified by:

rekeyEncoder in interface TlsCipher

Throws:

IOException

usesOpaqueRecordTypeDecode

public boolean usesOpaqueRecordTypeDecode()

Specified by:

usesOpaqueRecordTypeDecode in interface TlsCipher

usesOpaqueRecordTypeEncode

public boolean usesOpaqueRecordTypeEncode()

Specified by:

usesOpaqueRecordTypeEncode in interface TlsCipher