// SPDX-License-Identifier:MIT
pragma solidity ^0.5.17;

library RSKAddrValidator {
	/*
	 * @param addr it is an address to check that it does not originates from
	 * signing with PK = ZERO. RSK has a small difference in which @ZERO_PK_ADDR is
	 * also an address from PK = ZERO. So we check for both of them.
	 * */
	function checkPKNotZero(address addr) internal pure returns (bool) {
		return (addr != 0xdcc703c0E500B653Ca82273B7BFAd8045D85a470 && addr != address(0));
	}

	/*
	 * Safely compares two addresses, checking they do not originate from
	 * a zero private key.
	 * */
	function safeEquals(address addr1, address addr2) internal pure returns (bool) {
		return (addr1 == addr2 && addr1 != 0xdcc703c0E500B653Ca82273B7BFAd8045D85a470 && addr1 != address(0));
	}
}