Package org.bouncycastle.crypto.tls

Class TlsMac

  • public class TlsMac
extends java.lang.Object
    A generic TLS MAC implementation, acting as an HMAC based on some underlying Digest.

    • Constructor Summary

      Constructors 
      Constructor Description
      TlsMac​(TlsContext context, Digest digest, byte[] key, int keyOff, int keyLen)
      Generate a new instance of an TlsMac.

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      byte[] calculateMac​(long seqNo, short type, byte[] message, int offset, int length)
      Calculate the MAC for some given data.
      byte[] calculateMacConstantTime​(long seqNo, short type, byte[] message, int offset, int length, int fullLength, byte[] dummyData)  
      protected int getDigestBlockCount​(int inputLength)  
      byte[] getMACSecret()  
      int getSize()  
      protected byte[] truncate​(byte[] bs)  

      • Methods inherited from class java.lang.Object

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

    • Field Detail

      • secret

        protected byte[] secret

      • mac

        protected Mac mac

      • digestBlockSize

        protected int digestBlockSize

      • digestOverhead

        protected int digestOverhead

      • macLength

        protected int macLength

    • Constructor Detail

      • TlsMac

        public TlsMac​(TlsContext context,
              Digest digest,
              byte[] key,
              int keyOff,
              int keyLen)
        Generate a new instance of an TlsMac.
        Parameters:
        context - the TLS client context
        digest - The digest to use.
        key - A byte-array where the key for this MAC is located.
        keyOff - The number of bytes to skip, before the key starts in the buffer.
        keyLen - The length of the key.

    • Method Detail

      • getMACSecret

        public byte[] getMACSecret()
        Returns:
        the MAC write secret

      • getSize

        public int getSize()
        Returns:
        The output length of this MAC.

      • calculateMac

        public byte[] calculateMac​(long seqNo,
                           short type,
                           byte[] message,
                           int offset,
                           int length)
        Calculate the MAC for some given data.
        Parameters:
        type - The message type of the message.
        message - A byte-buffer containing the message.
        offset - The number of bytes to skip, before the message starts.
        length - The length of the message.
        Returns:
        A new byte-buffer containing the MAC value.

      • calculateMacConstantTime

        public byte[] calculateMacConstantTime​(long seqNo,
                                       short type,
                                       byte[] message,
                                       int offset,
                                       int length,
                                       int fullLength,
                                       byte[] dummyData)

      • getDigestBlockCount

        protected int getDigestBlockCount​(int inputLength)

      • truncate

        protected byte[] truncate​(byte[] bs)