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How to get private key from PKCS # 12 (.p12) file using C #

I am trying to sign some data using a PKCS # 12 certificate, however I have a problem getting the private key from a PKCS # 12 file (.p12).

    public byte[] sign(string text)
    {
        string password = "1111";
        X509Certificate2 cert = new X509Certificate2("c:\\certificate.p12",password);
        byte[] certData = cert.Export(X509ContentType.Pfx,password);

        X509Certificate2 newCert = new X509Certificate2(certData, password);
        RSACryptoServiceProvider crypt = (RSACryptoServiceProvider)newCert.PrivateKey;

        SHA1Managed sha1 = new SHA1Managed();
        UnicodeEncoding encoding = new UnicodeEncoding();
        byte[] data = encoding.GetBytes(text);
        byte[] hash = sha1.ComputeHash(data);
        return crypt.SignHash(hash, CryptoConfig.MapNameToOID("SHA1"));
    }

The problem is that newCert.PrivateKey is null, but if I use .pfx certicitae then it works.

    public byte[] sign(string text)
    {
        string password = "1234";
        X509Certificate2 cert = new X509Certificate2("c:\\certificate.pfx", password);
        RSACryptoServiceProvider crypt = (RSACryptoServiceProvider)cert.PrivateKey;
        SHA1Managed sha1 = new SHA1Managed();
        UnicodeEncoding encoding = new UnicodeEncoding();
        byte[] data = encoding.GetBytes(text);
        byte[] hash = sha1.ComputeHash(data);
        return crypt.SignHash(hash, CryptoConfig.MapNameToOID("SHA1"));
    }

So the question is, how to get this private key from a .p12 file?

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4 answers

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X509ContentType.Pkcs12 X509ContentType.Pfx
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docs , .export() Pfx, Cert, SerializedCert, Pkcs12.

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key.p12 . , , .

http://www.flexiprovider.de/examples/ExampleSMIMEsign.html

Security.addProvider(new de.flexiprovider.core.FlexiCoreProvider());
    // Next, we have to read the private PKCS #12 file, since the the
    // private key used for signing is contained in this file:
    DERDecoder dec = new DERDecoder(getResources().openRawResource(
            R.raw.key));
    PFX pfx = new PFX();
    try {
        pfx.decode(dec);
        SafeBag safeBag = pfx.getAuthSafe().getSafeContents(0)
                .getSafeBag(0);
        PKCS8ShroudedKeyBag kBag = (PKCS8ShroudedKeyBag) safeBag
                .getBagValue();
        char[] password = "my password for the p12".toCharArray();
        privKey = kBag.getPrivateKey(password);
        new AsyncLoadStorage(this).execute();
    } catch (ASN1Exception e) {
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