用php实现steem的private key转为public key的功能

直接上代码:

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use BitWasp\Bitcoin\Key\Factory\PrivateKeyFactory;
use BitWasp\Buffertools\Buffer;
use BitWasp\Buffertools\Buffertools;
use BitWasp\Bitcoin\Crypto\Hash;
use BitWasp\Bitcoin\Base58;
use BitWasp\Bitcoin\Bitcoin;
use BitWasp\Bitcoin\Crypto\EcAdapter\Impl\PhpEcc\Key\PublicKey;

function getPubKeyFromPrivKeyWif($wif) {
$factory = new PrivateKeyFactory();
$privKey = $factory->fromWif($wif);
$publicKey = $privKey->getPublicKey();
$pubKeyBuff = doSerialize($publicKey);
$checkSum = Hash::ripemd160($pubKeyBuff);
$addy = Buffertools::concat($pubKeyBuff, $checkSum->slice(0, 4));
$pubdata = Base58::encode($addy);
$pubKeyStr = 'STM'.$pubdata;
return $pubKeyStr;
}

function doSerialize(PublicKey $pubKey) {
$point = $pubKey->getPoint();
$prefix = getPubKeyPrefix($pubKey);
$xBuff = Buffer::hex(gmp_strval($point->getX(), 16), 32);
$yBuff = Buffer::hex(gmp_strval($point->getY(), 16), 32);
$data = Buffertools::concat($prefix , $xBuff);
// steem的compress与btc相反
if ($pubKey->isCompressed()) {
$data = Buffertools::concat($data, $yBuff);
}
return $data;
}

function getPubKeyPrefix($pubKey) {
// steem的compress与btc相反
return !$pubKey->isCompressed() ?
Bitcoin::getEcAdapter()->getMath()->isEven($pubKey->getPoint()->getY())
? Buffer::hex('02', 1) : Buffer::hex('03', 1)
: Buffer::hex('04', 1);
}

之前一直搞不出来,就是因为不知道为什么 Steem 判断压缩的变量跟 BTC 的正好是反的。不懂,先略过吧。

ET碎碎念,每周一,晚六点一刻更新,欢迎订阅