Question

我有一个私钥和加密字符串。实际上字符串已使用.NET模块加密。现在我需要解密字符串。我在php中试过，但它引发了我的错误

 openssl_private_decrypt(): key parameter is not a valid private key

我在perl中尝试但是它需要自己的私钥，但是它需要使用我自己的私钥，它是在我们的服务器中生成的。

请建议我解决这个问题。 PHP，Ruby，Perl解决方案会更有帮助。

$crypttext="gKL/n5hkBg4jyjrLRqjQbf9gAS3xnbp1xmCmamPO33fW21JAJtlVQHYR6O1dOw3tfobMe/0uXm/kgivae9zHNey4Wt3UGzPwosUrx7V8zhC97AXya2tuENO1Fmc4Z8l9+UalwtUZxMGtl3Ua9DYuvxLP/TuavgRNpmG6eemGPag=";
$fp=fopen("private.pem","r");
$priv_key=fread($fp,8192);
fclose($fp);
openssl_private_decrypt(base64_decode($crypttext ),$newsource,false ) ;
echo "String decrypt : $newsource"**;

私钥

<BitStrength>1024</BitStrength><RSAKeyValue><Modulus>t2G2WWIal1EinPn54ZPc3S1UgGTDxr6RFc+XEMR723VSg9toU8lSfTD7C26bUcbDxBwP1/1MbdQcx/dKX+7UlB5z79vrwfT89rUZGWeH7VZvuAawtHURgucyGMhqAZ9NxDEAl5Uo3nsNL9j1JlSBfeZf8pU5sf70KezqJTRsfrE=</Modulus><Exponent>AQAB</Exponent><P>82dZbOjQCJ7NV6EuVJXqPlh4FB65LBL1w9696sKFZuIr8refGwTZOY05se6oHbT9mn8OFXVA6A/wmz7oWNPk9w==</P><Q>wN8uixNk73DIF2SHb0aunnW5XxAIq3KxeQKoUTBAzL7BqXmKjk6XDnfxDbybmcT51wGhiO20lGg51zuxnsPXlw==</Q><DP>Kv4+VXZqCJvEOY5G2LoCPjDyRNuIabiPoKFfenARkDKzAJReji81D21am4tENrsZcIiwvCmR5WurXECoWchT0Q==</DP><DQ>qGRzW4O0VYVvfVUNFi9tF/aKwR/boe0CXDfgwvnRKbHGnfP67+JX6o73zFmGtQuQYpMO+OEpD4WsMmnw2z/7ww==</DQ><InverseQ>czq4+xiiVxb63ZtKwkxyJoDLFH0f18YlfFQTrEoAx7UE9HdjOjsJFpZ54g0yK3/S/yVgIXPwMcw6LU1QvqazPg==</InverseQ><D>Ktp/tWWSlzfToeFcvpVCMMGOFK73fTM9Tl6Di9yOoRtKnBuixqmuSCkxEVvYmgSb7PEt1qiPur6ttyEX1VFHhaugTr3aVhUpF+k7ULaHrCb8UymXXW3pp/yl/QOMPWuNKVv/GU3aQ3VTc3WUaYuOnaIkJk7uoYDQn0QqWtxtT60=</D></RSAKeyValue>

Answer 1

phpseclib, a pure PHP RSA implementation，支持这种格式的XML私钥。用法示例：

<?php
include('Crypt/RSA.php');

$rsa = new Crypt_RSA();
$rsa->loadKey('...'); // private key

echo $rsa->decrypt($ciphertext);
?>

Answer 2

您需要转换密钥并实际使用它：

$crypttext="gKL/n5hkBg4jyjrLRqjQbf9gAS3xnbp1xmCmamPO33fW21JAJtlVQHYR6O1dOw3tfobMe/0uXm/kgivae9zHNey4Wt3UGzPwosUrx7V8zhC97AXya2tuENO1Fmc4Z8l9+UalwtUZxMGtl3Ua9DYuvxLP/TuavgRNpmG6eemGPag=";
$priv_key = openssl_pkey_get_private("file://path/to/private.pem");
openssl_private_decrypt(base64_decode($crypttext ), $newsource, $priv_key ) ;
echo "String decrypt : $newsource"**;

Answer 3

解决方案是以PHP期望的格式生成密钥（.pem文件，我认为格式称为DER ASN.1，但我不确定），使用openssl（通常在linux下）），然后仍然使用OpenSSL将其转换为.NET可以读取的格式。有关详细信息，请参阅this SO answer。

在Linux下：

openssl genrsa -out private.pem 1024
openssl rsa -in private.pem -out public.pem -pubout
openssl req -nodes -x509 -days 3650 -subj '/CN=www.example.com/emailAddress=info@example.com' -new -key private.pem -out certificate.crt
openssl pkcs12 -export -out certificate.pfx -inkey private.pem -in certificate.crt

在.NET下：

// Get the public key
X509Certificate2 pubCertificate = new X509Certificate2("certificate.crt", "passphrase", X509Certificates.X509KeyStorageFlags.Exportable);
RSACryptoServiceProvider public = (RSACryptoServiceProvider)(pubCertificate.PublicKey.Key);
System.Console.WriteLine(public.ToXmlString(false));

// Get the private key
X509Certificate2 privCertificate = new X509Certificate2("certificate.pfx", "passphrase", X509Certificates.X509KeyStorageFlags.Exportable);
RSACryptoServiceProvider private = (RSACryptoServiceProvider)(privCertificate .PrivateKey);
System.Console.WriteLine(private.ToXmlString(true));

使用私钥进行RSA解密

3 个答案: