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    <p>The .cer file contains (it is the common case) only the X509 certificate in an unencrypted form. In that case, no password is required to decode the certificate. I suppose the X509Certificate2 constructor tries to determine the encoding format of the Byte[] parameter and ignore the password parameter when it is not required. And it is more than likely that, after being created, the <code>PrivateKey</code> property of the object is <code>null</code>.</p> <p>When loading a .cer file you should use the constructor which takes only 1 Byte[] parameter. The documentation of that constructor clearly specifies the supported data formats:</p> <blockquote> <p>This constructor creates a new X509Certificate2 object using certificate information from a byte array. The byte array can be binary (DER) encoded or Base64-encoded X.509 data. The byte array can also be a PKCS7 (Authenticode) signed file; the signer certificate is used to create the object.</p> </blockquote> <p>The <a href="http://www.rsa.com/rsalabs/node.asp?id=2138" rel="nofollow">PKCS#12 format</a> (.p12 or .pfx file) is a container format for certificates and private keys. In that case the password is required to decrypt the encrypted private key. Actually the behaviour with a PKCS#12 file is specified in the The X509Certificate2 constructor documentation:</p> <blockquote> <p>This constructor is used with PKCS12 (PFX) files that contain the certificate's private key. Calling this constructor with the correct password decrypts the private key and saves it to a key container.</p> </blockquote>
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    1. CO+1. .cer files are used to store public keys usually, as discussed in http://www.lextm.com/2012/02/simple-publicprivate-key-signing-sample.html
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    2. COOk, that's what I needed. Thanks.
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    3. COlink seems to have changed to http://www.lextm.com/index.php/2012/02/simple-publicprivate-key-signing-sample-code/
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