3

My question was first asked on stackoverflow but due lack of privileges I couldn't move it here directly.

I am trying to generate an Ethereum address based on a given private key following this "How are ethereum addresses generated?" and using this Keccak-256 Ethereum implementation. But it show this error:

Warning: openssl_pkey_get_details() expects parameter 1 to be resource, boolean given in /localweb/getethaddress.php on line 15

openssl_pkey_get_private error:0D07207B:asn1 encoding routines:ASN1_get_object:header too long
openssl_pkey_get_private error:0D068066:asn1 encoding routines:ASN1_CHECK_TLEN:bad object header
openssl_pkey_get_private error:0D07803A:asn1 encoding routines:ASN1_ITEM_EX_D2I:nested asn1 error
openssl_pkey_get_private error:10092010:elliptic curve routines:d2i_ECPrivateKey:EC lib
openssl_pkey_get_private error:100DE08E:elliptic curve routines:OLD_EC_PRIV_DECODE:decode error
openssl_pkey_get_private error:0D07207B:asn1 encoding routines:ASN1_get_object:header too long
openssl_pkey_get_private error:0D068066:asn1 encoding routines:ASN1_CHECK_TLEN:bad object header
openssl_pkey_get_private error:0D07803A:asn1 encoding routines:ASN1_ITEM_EX_D2I:nested asn1 error
openssl_pkey_get_private error:0907B00D:PEM 

routines:PEM_READ_BIO_PRIVATEKEY:ASN1 lib

My implementation:

<?php
    require_once 'keccak256.php';


    // Format the private key as PEM
    $header_private_key = "-----BEGIN EC PRIVATE KEY-----\n";
    $footer_private_key = "\n-----END EC PRIVATE KEY-----";
    //echo hex2bin("1a63b5c735d66d827f40f7d3a257da777cd7997d48bd5d319c36683c0ad3b1de");
    $eth_private_key = $header_private_key . "1a63b5c735d66d827f40f7d3a257da777cd7997d48bd5d319c36683c0ad3b1de" . $footer_private_key;

    // Load private key from a string
    $private_key = openssl_pkey_get_private($eth_private_key);
    var_dump($private_key);
    while ($msg = openssl_error_string())
        echo "openssl_pkey_get_private " . $msg . "<br />\n";

    // Get the Public key
    $_public_key = openssl_pkey_get_details($private_key)['key'];
    $eth_public_key = openssl_pkey_get_public($_public_key);

    // hash the public key
    $hash_public_key = Keccak256\Keccak256::hash($eth_public_key, 256);; 
    $eth_address = '0x' . substr($hash_public_key, -40);


    echo 'Your generated address: ' . $eth_address . '<br>';
    echo 'Myetherwallet address: 0x47180b59dd8c81f46186900bbd29cbf675b3fbd9';


    /*
        a generated address from Myetherwallet 40: 47180b59dd8c81f46186900bbd29cbf675b3fbd9
        private key 64: 1a63b5c735d66d827f40f7d3a257da777cd7997d48bd5d319c36683c0ad3b1de
    */
?>
  • Here's how they do in the terminal, Using OpenSSL and keccak-256sum from a terminal: kobl.one/blog/create-full-ethereum-keypair-and-address – MSwezey Jan 4 '18 at 8:40
  • @MSwezey I read that article too, but I am confused why the private key provided by Myetherwallet not the same length vs the generated by OpenSSL? – H Aßdøµ Jan 4 '18 at 8:44
  • @HAßdøµ It appears you are trying to wrap the raw private key in a certificate. The internal format used by PEM certificates can be quite complex. I suggest to search a library to do this in PHP, I only know of this js library does the correct encoding github.com/blockstack/key-encoder-js – Ismael Jan 4 '18 at 14:56
  • @Ismael Is is possible at least to convert it using OpenSSL? – H Aßdøµ Jan 4 '18 at 16:20
  • 1
    @Ismael I putted a question there: stackoverflow.com/questions/48101258/… – H Aßdøµ Jan 4 '18 at 19:35
0

There are some functions in web3p toolset, but I have no Idea if it will work.

https://github.com/web3p/ethereum-util/blob/0815348c3513e004d7dfa65ebeb31cda9d41f77e/src/Util.php#L133-L172

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.