Examples of freenet.crypt.PCFBMode.decipher()

freenet.crypt.PCFBMode.decipher()
Deciphers one byte of data, by XOR'ing the ciphertext byte with one byte from the encrypted buffer. Then places the received byte in the feedback register. If no bytes are available in the encrypted buffer, the feedback register is encrypted, providing block_size/8 new bytes for decryption

    byte[] hash = Arrays.copyOfRange(buf, offset+ivLength, offset+ivLength+digestLength);
    pcfb.blockDecipher(hash, 0, hash.length);


    int dataStart = ivLength + digestLength + offset+2;


    int byte1 = ((pcfb.decipher(buf[dataStart-2])) & 0xff);
    int byte2 = ((pcfb.decipher(buf[dataStart-1])) & 0xff);
    int dataLength = (byte1 << 8) + byte2;
    if(logDEBUG) Logger.debug(this, "Data length: "+dataLength+" (1 = "+byte1+" 2 = "+byte2+ ')');
    if(dataLength > length - (ivLength+hash.length+2)) {
      if(logDEBUG) Logger.debug(this, "Invalid data length "+dataLength+" ("+(length - (ivLength+hash.length+2))+") in tryProcessAuth");

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    pcfb.blockDecipher(hash, 0, hash.length);


    int dataStart = ivLength + digestLength + offset+2;


    int byte1 = ((pcfb.decipher(buf[dataStart-2])) & 0xff);
    int byte2 = ((pcfb.decipher(buf[dataStart-1])) & 0xff);
    int dataLength = (byte1 << 8) + byte2;
    if(logDEBUG) Logger.debug(this, "Data length: "+dataLength+" (1 = "+byte1+" 2 = "+byte2+ ')');
    if(dataLength > length - (ivLength+hash.length+2)) {
      if(logDEBUG) Logger.debug(this, "Invalid data length "+dataLength+" ("+(length - (ivLength+hash.length+2))+") in tryProcessAuth");
      return false;

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    byte[] hash = Arrays.copyOfRange(buf, offset+ivLength, offset+ivLength+digestLength);
    pcfb.blockDecipher(hash, 0, hash.length);


    int dataStart = ivLength + digestLength + offset+2;


    int byte1 = ((pcfb.decipher(buf[dataStart-2])) & 0xff);
    int byte2 = ((pcfb.decipher(buf[dataStart-1])) & 0xff);
    int dataLength = (byte1 << 8) + byte2;
    if(logMINOR) Logger.minor(this, "Data length: "+dataLength+" (1 = "+byte1+" 2 = "+byte2+ ')');
    if(dataLength > length - (ivLength+hash.length+2)) {
      if(logMINOR) Logger.minor(this, "Invalid data length "+dataLength+" ("+(length - (ivLength+hash.length+2))+") in tryProcessAuthAnon");

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    pcfb.blockDecipher(hash, 0, hash.length);


    int dataStart = ivLength + digestLength + offset+2;


    int byte1 = ((pcfb.decipher(buf[dataStart-2])) & 0xff);
    int byte2 = ((pcfb.decipher(buf[dataStart-1])) & 0xff);
    int dataLength = (byte1 << 8) + byte2;
    if(logMINOR) Logger.minor(this, "Data length: "+dataLength+" (1 = "+byte1+" 2 = "+byte2+ ')');
    if(dataLength > length - (ivLength+hash.length+2)) {
      if(logMINOR) Logger.minor(this, "Invalid data length "+dataLength+" ("+(length - (ivLength+hash.length+2))+") in tryProcessAuthAnon");
      return false;

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    byte[] hash = Arrays.copyOfRange(buf, offset+ivLength, offset+ivLength+digestLength);
    pcfb.blockDecipher(hash, 0, hash.length);


    int dataStart = ivLength + digestLength + offset+2;


    int byte1 = ((pcfb.decipher(buf[dataStart-2])) & 0xff);
    int byte2 = ((pcfb.decipher(buf[dataStart-1])) & 0xff);
    int dataLength = (byte1 << 8) + byte2;
    if(logDEBUG) Logger.minor(this, "Data length: "+dataLength+" (1 = "+byte1+" 2 = "+byte2+ ')');
    if(dataLength > length - (ivLength+hash.length+2)) {
      if(logDEBUG) Logger.debug(this, "Invalid data length "+dataLength+" ("+(length - (ivLength+hash.length+2))+") in tryProcessAuth");

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    pcfb.blockDecipher(hash, 0, hash.length);


    int dataStart = ivLength + digestLength + offset+2;


    int byte1 = ((pcfb.decipher(buf[dataStart-2])) & 0xff);
    int byte2 = ((pcfb.decipher(buf[dataStart-1])) & 0xff);
    int dataLength = (byte1 << 8) + byte2;
    if(logDEBUG) Logger.minor(this, "Data length: "+dataLength+" (1 = "+byte1+" 2 = "+byte2+ ')');
    if(dataLength > length - (ivLength+hash.length+2)) {
      if(logDEBUG) Logger.debug(this, "Invalid data length "+dataLength+" ("+(length - (ivLength+hash.length+2))+") in tryProcessAuth");
      return false;

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