我正在尝试测试我的服务器端 IAB 签名验证方法。我想使用我的公钥和私钥（不是来自 Google 的），所以我伪造收据并用 id_rsa.pub 签名：
openssl dgst -binary -sha1 -sign /Users/user/.ssh/id_rsa receipt.json | openssl base64 > signature.txt
在 php 中，我想用 openssl_verify 验证它：
$publicKey = // content of /Users/user/.ssh/id_rsa.pub
// Public key in id_rsa.pub with proper header and footer
$publicKeyFull = "-----BEGIN PUBLIC KEY-----\n" . chunk_split($publicKey, 64, "\n") . "-----END PUBLIC KEY-----";
// Data
$data = // content of receipt.json WITHOUT LINE BREAKS
// Public key id
$publicKeyId = openssl_get_publickey($publicKeyFull);
// Signature
$signature = // content of signature.txt generated previously
// receipt.json, signature.txt, id_rsa.public
$verified = openssl_verify($data, base64_decode($signature), $publicKeyId, OPENSSL_ALGO_SHA1);
var_dump($verified);
验证总是错误的，我得到：
Warning: openssl_verify(): supplied key param cannot be coerced into a public key in...
我的 id_rsa.pub 密钥有什么问题？