namespace Org.BouncyCastle.Tls.Crypto.Impl { public class TlsBlockCipher : TlsCipher, TlsCipherExt { protected readonly TlsCryptoParameters m_cryptoParams; protected readonly byte[] m_randomData; protected readonly bool m_encryptThenMac; protected readonly bool m_useExplicitIV; protected readonly bool m_acceptExtraPadding; protected readonly bool m_useExtraPadding; protected readonly TlsBlockCipherImpl m_decryptCipher; protected readonly TlsBlockCipherImpl m_encryptCipher; protected readonly TlsSuiteHmac m_readMac; protected readonly TlsSuiteHmac m_writeMac; protected readonly byte[] m_decryptConnectionID; protected readonly byte[] m_encryptConnectionID; protected readonly bool m_decryptUseInnerPlaintext; protected readonly bool m_encryptUseInnerPlaintext; public virtual bool UsesOpaqueRecordType { get; } public TlsBlockCipher(TlsCryptoParameters cryptoParams, TlsBlockCipherImpl encryptCipher, TlsBlockCipherImpl decryptCipher, TlsHmac clientMac, TlsHmac serverMac, int cipherKeySize); public virtual int GetCiphertextDecodeLimit(int plaintextLimit); public virtual int GetCiphertextEncodeLimit(int plaintextLength, int plaintextLimit); public virtual int GetPlaintextLimit(int ciphertextLimit); public virtual int GetPlaintextDecodeLimit(int ciphertextLimit); public virtual int GetPlaintextEncodeLimit(int ciphertextLimit); public virtual TlsEncodeResult EncodePlaintext(long seqNo, short contentType, ProtocolVersion recordVersion, int headerAllocation, byte[] plaintext, int offset, int len); public virtual TlsDecodeResult DecodeCiphertext(long seqNo, short recordType, ProtocolVersion recordVersion, byte[] ciphertext, int offset, int len); public virtual void RekeyDecoder(); public virtual void RekeyEncoder(); protected virtual int CheckPaddingConstantTime(byte[] buf, int off, int len, int blockSize, int macSize); protected virtual int ChooseExtraPadBlocks(int max); protected virtual int GetCiphertextLength(int blockSize, int macSize, int maxPadding, int plaintextLength); protected virtual int GetPlaintextLength(int blockSize, int macSize, int ciphertextLength); } }