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PORead Private Key from PFX-file
 

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    <p>I know, there are <em>many</em> posts about this, but still I cannot find a solution to get this to work. I have generated a <em>PFX</em>-file with <strong>openssl</strong> on my machine like this:</p> <pre><code>openssl x509 -req -days 365 -in "myReqest.csr" -signkey "myPrivateKey.pem" -out "myCertificate.crt" openssl pkcs12 -export -out "myCertificate.pfx" -inkey "myPrivateKey.pem" -in "myCertificate.crt" -certfile "myCertificate.crt" </code></pre> <p>In my C# app, I access the private key like this:</p> <pre><code>var cert = new X509Certificate2("myCertificate.pfx", "myPassword"); cert.HasPrivateKey; // This is always true! cert.PrivateKey; // Works on my machine (only) </code></pre> <p>This works perfectly fine (on <em>my</em> machine), but when I run the same code on <em>another</em> machine, it throws: <strong><em>"Key set not found"</em></strong>, even though <code>HasPrivateKey</code> returns <code>true</code>! Shouldn't the private key be included in the *.pfx-file? Can you tell me:</p> <ol> <li><p>Was the certificate/private key somehow automatically installed on my machine by <em>openssl</em> when I created it?</p></li> <li><p>How can I read the private key from the *.PFX-file (or alternatively from the *.PEM-file)?</p></li> </ol> <p>StackTrace of Exception:</p> <pre><code>at System.Security.Cryptography.Utils.CreateProvHandle(CspParameters parameters, Boolean randomKeyContaier) at System.Security.Cryptography.Utils.GetKeyPairHelper(CspAlgorithmType keyType, CspParameters parameters, Boolean randomKeyContaier, Int32 dwKeySize, SafeProvHandle&amp; safeProvHandle, SafeKeyHandle&amp; safeKeyHandle) at System.Security.Cryptography.RSACryptoServiceProvider.GetKeyPair() at System.Security.Cryptography.RSACryptoServiceProvider..ctor(Int32 dwKeySize, CspParameters parameters, Boolean useDefaultKeySize) at System.Security.Cryptography.RSACryptoServiceProvider..ctor(CspParameters parameter) at System.Security.Cryptography.X509Certificates.X509Certificate2.get_PrivateKey() </code></pre> <p><strong><em>Update:</em></strong></p> <p>I've found out, that the following does work:</p> <pre><code>// on my machine // read certificate from file (exportable!) X509Certificate2 cert = new X509Certificate2("filename.pfx", "password", X509KeyStorageFlags.Exportable) // sign data etc. ((RSACryptoServiceProvider)cert.PrivateKey).SignData(... // export private key to XML-file File.WriteAllText("filename.xml", cert.PrivateKey.ToXmlString(true)); // on the other machine // create new RSA object RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(); // import private key from xml rsa.FromXmlString(File.ReadAllText("filename.xml")); // verify data etc. rsa.VerifyData(... </code></pre> <p>However, to me, this is only a workaround, I would like to do it an a more conventional/standard compliant way!</p>
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    1. USabatishchev
    1. USmarsze
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    1. COWild guess: it's a *private* key generated on *your* machine, so *your* machine only can use it (I abused italics for emphasis)
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      1. USAlex
    2. COare you also running the openssl commands on the other machine? (all you mentioned was "code").
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      1. USPeter Ritchie
    3. CO@Alex This is not very helpful. I thought the private key was supposed to be included in the certificate file, since it resided in a separate file which I created beforehand and which I included explicitly when creating the certificate with openssl.
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