code: public boolean setRxMasterSalt(byte[] salt) {
  		boolean res = false;
  		if (salt.length == MASTER_SALT_SIZE_BYTES) {
  			rxMasterSalt = null;
  			rxMasterSalt = platform.getUtils().copy(salt);
  			res = true;
  			logDebug("setRxMasterSalt "
  					+ platform.getUtils().byteToHexString(rxMasterSalt));
  		} else {
  			logError("Wrong length for iRxMasterSalt: " + salt.length
  					+ " expected " + MASTER_SALT_SIZE_BYTES + " bytes");
  		}
  		return res;
  	}
docs: Sets the Master Salt to be used for generating the receive session keys
  (only supports salt size 112 bits for zrtp - see zrtp spec section 4.5.3)
  
  @param salt
  Master Salt string
  @return true if set, false otherwise (invalid length string)