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我需要为可填写的表格创建数字签名。这意味着当用户填写表格时，他必须签署文档。使用他自己的私钥，我们的服务器将使用公钥检查他的私钥。我研究了它，但我找不到真正的答案。我将使用 php-openssl 并且可以填写表格。我可以用这个代码创建一个密钥对；

// generate 2048-bit RSA key    
$pkGenerate = openssl_pkey_new(array(

    'private_key_bits' => 2048,

    'private_key_type' => OPENSSL_KEYTYPE_RSA));

// get the private key    
openssl_pkey_export($pkGenerate,$pkGeneratePrivate);

// get the public key    
$pkGenerateDetails = openssl_pkey_get_details($pkGenerate);

$pkGeneratePublic = $pkGenerateDetails['key'];

// free resources    
openssl_pkey_free($pkGenerate);

// fetch/import public key from PEM formatted string    
// remember $pkGeneratePrivate now is PEM formatted...    
// this is an alternative method from the public retrieval in previous

$pkImport = openssl_pkey_get_private($pkGeneratePrivate); // import

$pkImportDetails = openssl_pkey_get_details($pkImport); // same as getting the public key in previous

$pkImportPublic = $pkImportDetails['key'];

openssl_pkey_free($pkImport); // clean up

echo "\n".$pkGeneratePrivate

    ."\n".$pkGeneratePublic

    ."\n".$pkImportPublic

    ."\n".'Public keys are '.
(strcmp($pkGeneratePublic,$pkImportPublic)?'different':'identical').'.';
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