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I have tried to use sha3 but it return error since invalid address. Here is my code. The sha3 returns 32 bytes address. I wonder is there other function that returns 20 bytes .

var to_add = web3.sha3(str);
web3.eth.sendTransaction({from: '0xC5b0f45d8533909a80eA45Ed2FC42bd36C1Cccac', data:str,to:to_add},function(err, transactionHash)
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  • What's str???
    – goodvibration
    Commented Nov 18, 2020 at 17:45
  • web3.sha3 seems pretty old BTW. Are you still on web3.js v0.x?
    – goodvibration
    Commented Nov 18, 2020 at 17:47
  • @goodvibration str is user logging information. I need to store them in recipient(to address) . Yes I am using web3.js v0 since class requires that. thanks
    – chen Crush
    Commented Nov 18, 2020 at 17:51
  • What is its value, is what I meant to ask.
    – goodvibration
    Commented Nov 18, 2020 at 17:54
  • The value is not defined. It depends on which function user call. Bascially, the value can be "user a log in", or "user a log out "etc. So the length is not fixed
    – chen Crush
    Commented Nov 18, 2020 at 18:09

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Addresses are computed from a private key, see How is the address of an Ethereum contract computed?. If you are trying to generate them from a random hexadecimal string it is very likely you will not be able to access the funds transferred.

If you already have an hexadecimal string that comes from a valid address and its checksum is incorrect you can fix it with web3.utils.toChecksumAddress.

> badAddress = "0xaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";
> goodAddress = web3.utils.toChecksumAddress(badAddress);
> console.log(goodAddress);
0xaAaAaAaaAaAaAaaAaAAAAAAAAaaaAaAaAaaAaaAa
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