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POConverting a byte array to a X.509 certificate
 

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  1. POConverting a byte array to a X.509 certificate
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    <p>I'm trying to port a piece of Java code into .NET that takes a Base64 encoded string, converts it to a byte array, and then uses it to make a X.509 certificate to get the modulus &amp; exponent for RSA encryption.</p> <p>This is the Java code I'm trying to convert:</p> <pre><code>byte[] externalPublicKey = Base64.decode("base 64 encoded string"); KeyFactory keyFactory = KeyFactory.getInstance("RSA"); EncodedKeySpec publicKeySpec = new X509EncodedKeySpec(externalPublicKey); Key publicKey = keyFactory.generatePublic(publicKeySpec); RSAPublicKey pbrtk = (java.security.interfaces.RSAPublicKey) publicKey; BigInteger modulus = pbrtk.getModulus(); BigInteger pubExp = pbrtk.getPublicExponent(); </code></pre> <p>I've been trying to figure out the best way to convert this into .NET. So far, I've come up with this:</p> <pre><code>byte[] bytes = Convert.FromBase64String("base 64 encoded string"); X509Certificate2 x509 = new X509Certificate2(bytes); RSA rsa = (RSA)x509.PrivateKey; RSAParameters rsaParams = rsa.ExportParameters(false); byte[] modulus = rsaParams.Modulus; byte[] exponent = rsaParams.Exponent; </code></pre> <p>Which to me looks like it should work, but it throws a <a href="http://msdn.microsoft.com/en-us/library/system.security.cryptography.cryptographicexception.aspx" rel="nofollow noreferrer">CryptographicException</a> when I use the base 64 encoded string from the Java code to generate the X509 certificate. The exact message I receive is:</p> <blockquote> <p>Cannot find the requested object.</p> </blockquote> <p>Is Java's X.509 implementation just incompatible with .NET's, or am I doing something wrong in my conversion from Java to .NET? </p> <p>Or is there simply no conversion from Java to .NET in this case?</p>
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      1. USJoão Dias Amaro
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    1. COPerhaps you could post the base64 string of an cert so people could look at it?
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    2. COIt is just a public key, it is *not* an X509 certificate.
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      1. USJames K Polk
 

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