php - 从保存的私钥 PHP 生成公钥

Question

我已经以这种格式将私钥保存在数据库中，例如

-----BEGIN PRIVATE KEY-----
 MIICdgIBADA................CHGIdCtZEmTD7sbLUcFCYDbohnqaWf2d+2I
 EyC/Hg/tS4d+BQ==
 -----END PRIVATE KEY-----

我需要从中提取公钥。 openssl_pkey_get_details 需要资源，但如何从字符串创建资源？

我试过了

$public_key = openssl_pkey_get_details(openssl_pkey_get_public($private));  

错误是openssl_pkey_get_details() expects parameter 1 to be resource, boolean given

编辑 1:

我正在尝试@kbarborak 的解决方案，但 $pk_get 是错误的:

$pk_string = "-----BEGIN PRIVATE KEY-----\n".chunk_split($data[4], 64, "\n")."-----END PRIVATE KEY-----\n";
$pk_get = openssl_pkey_get_private($pk_string);

die(var_dump($pk_string));

var_dump 的输出是:

string(944) "-----BEGIN PRIVATE KEY-----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-----END PRIVATE KEY-----
"

Answer 1

提取公钥

// Private key as string
$pem_private_key = file_get_contents('mykey.pem');

$private_key = openssl_pkey_get_private($pem_private_key);

// Public key as PEM string
$pem_public_key = openssl_pkey_get_details($private_key)['key'];
// As PHP resource
$public_key = openssl_pkey_get_public($pem_public_key);

echo $pem_public_key;
echo $public_key;

准备私钥字符串

$pk_string = "-----BEGIN RSA PRIVATE KEY-----\n".chunk_split($data[4], 64, "\n")."-----END RSA PRIVATE KEY-----\n";
$pk_get = openssl_pkey_get_private($pk_string);

die(var_dump($pk_string));

使用 BEGIN RSA PRIVATE KEY 而不是 BEGIN PRIVATE KEY(与 END 相同)。

希望对您有所帮助。