Solidity Address to Bytes – How to Convert an Address to Bytes

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What is the recommended way to convert an address to bytes in Solidity?

Best Answer

To be even more efficient:

function toBytes(address a) public pure returns (bytes memory b){
    assembly {
        let m := mload(0x40)
        a := and(a, 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF)
        mstore(add(m, 20), xor(0x140000000000000000000000000000000000000000, a))
        mstore(0x40, add(m, 52))
        b := m
   }
}

Takes just 695 gas vs 2500 for Gokulnath's answer and 5000 for Eth's

Edit for solidity ^0.5.0:

This is almost as efficient and much more readable:

function toBytes(address a) public pure returns (bytes memory) {
    return abi.encodePacked(a);
}
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