org.bouncycastle.tls.crypto

Interface TlsCipher

All Known Implementing Classes:

TlsAEADCipher, TlsBlockCipher, TlsNullCipher, TlsNullNullCipher

public interface TlsCipher

Base interface for a TLS bulk cipher.

Method Summary

Modifier and Type	Method and Description
TlsDecodeResult	decodeCiphertext(long seqNo, short recordType, ProtocolVersion recordVersion, byte[] ciphertext, int offset, int len) Decode the passed in ciphertext using the current bulk cipher.
TlsEncodeResult	encodePlaintext(long seqNo, short contentType, ProtocolVersion recordVersion, int headerAllocation, byte[] plaintext, int offset, int len) 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 plaintextLength, int plaintextLimit) Return the maximum output size for a ciphertext given an actual input plaintext size of plaintextLength bytes and a maximum input plaintext size of plaintextLimit bytes.
int	getPlaintextLimit(int ciphertextLimit) Return the maximum size for the plaintext given ciphertextlimit bytes of ciphertext.
void	rekeyDecoder()
void	rekeyEncoder()
boolean	usesOpaqueRecordType()

Method Detail

getCiphertextDecodeLimit

int getCiphertextDecodeLimit(int plaintextLimit)

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

Parameters:

plaintextLimit - the maximum output size for the plaintext.

Returns:

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

getCiphertextEncodeLimit

int getCiphertextEncodeLimit(int plaintextLength,
                             int plaintextLimit)

Return the maximum output size for a ciphertext given an actual input plaintext size of plaintextLength bytes and a maximum input plaintext size of plaintextLimit bytes.

Parameters:

plaintextLength - the actual input size for the plaintext.

plaintextLimit - the maximum input size for the plaintext.

Returns:

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

getPlaintextLimit

int getPlaintextLimit(int ciphertextLimit)

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

Parameters:

ciphertextLimit - the maximum number of bytes of ciphertext.

Returns:

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

encodePlaintext

TlsEncodeResult encodePlaintext(long seqNo,
                                short contentType,
                                ProtocolVersion recordVersion,
                                int headerAllocation,
                                byte[] plaintext,
                                int offset,
                                int len)
                         throws java.io.IOException

Encode the passed in plaintext using the current bulk cipher.

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.

offset - offset into input array the plaintext starts at.

len - length of the plaintext in the array.

Returns:

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

Throws:

java.io.IOException

decodeCiphertext

TlsDecodeResult decodeCiphertext(long seqNo,
                                 short recordType,
                                 ProtocolVersion recordVersion,
                                 byte[] ciphertext,
                                 int offset,
                                 int len)
                          throws java.io.IOException

Decode the passed in ciphertext using the current bulk cipher.

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.

offset - offset into input array the ciphertext starts at.

len - length of the ciphertext in the array.

Returns:

A TlsDecodeResult containing the result of decoding.

Throws:

java.io.IOException

rekeyDecoder

void rekeyDecoder()
           throws java.io.IOException

Throws:

java.io.IOException

rekeyEncoder

void rekeyEncoder()
           throws java.io.IOException

Throws:

java.io.IOException

usesOpaqueRecordType

boolean usesOpaqueRecordType()