Convert bytes32 to address

Question

Is there a simple way to convert a bytes32, e.g. 0xca35b7d915458ef540ade6068dfe2f44e8fa733c, to an address?

bytes32 data = "0xca35b7d915458ef540ade6068dfe2f44e8fa733c";

I tried casting it with address(data) but that didn't work. I've also seen this solution here but that only works with bytes and not bytes32.

Here's the function I need in solidity:

function bytes32ToAddress(bytes32 input) public pure returns(address){
   // convert input to address
   return ...;
}

Answer 1

This works fine. Perhaps you were actually including single quotes in your code? If so, remove them.

pragma solidity ^0.4.24;

contract Test {
    function test(bytes32 data) external pure returns (address) {
        return address(data);
    }
}

Answer 2

For solidity 0.5.x you can use

pragma solidity ^0.5.0;

contract Test {
    function test(bytes32 data) external pure returns (address) {
        return address(uint160(uint256(data)));
    }
}

First convert the bytes32 to a uint256, later to uint160(20 bytes) and finaly to addres, this use big endian.

If you want use little endian you should use address(uint160(bytes20(b)))

For more information: solidity doc

Answer 3

assembly {
    mstore(0, hash)
    addr := mload(0)
}

Here is an example how to convert public key into address this way: Get address from public key in Solidity

Answer 4

If you convert a type that uses a larger byte size to an address, for example bytes32, then the address is truncated. To reduce conversion ambiguity version 0.4.24 and higher of the compiler force you make the truncation explicit in the conversion. Take for example the address 0x111122223333444455556666777788889999AAAABBBBCCCCDDDDEEEEFFFFCCCC. You can use address(uint160(bytes20(b))), which results in 0x111122223333444455556666777788889999aAaa, or you can use address(uint160(uint256(b))), which results in 0x777788889999AaAAbBbbCcccddDdeeeEfFFfCcCc.

https://docs.soliditylang.org/en/v0.5.9/types.html#address