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POJava and .NET interop on (RSA) signatures
 

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  1. POJava and .NET interop on (RSA) signatures
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    <p>I'm signing some data on a .net-based smartcard and trying to verify that signature in a java environment - but without success.</p> <p><strong>Smartcard (c#):</strong></p> <pre><code>RSACryptoServiceProvider rsaProvider = new RSACryptoServiceProvider(1024); // In a different method, rsaParams.Exponent and rsaParams.Modulus are set rsaProvider.ImportParameters(rsaParams); // Here I'm importing the key SHA1 sha1 = SHA1.Create(); byte[] signature = rsaProvider.SignData(data, sha1); </code></pre> <p><strong>Client (Java):</strong></p> <pre><code>Signature sig = Signature.getInstance("SHA1withRSA"); sig.initVerify(rsaPublicKey); // initiate the signature with public key sig.update(data); // update signature with the data that was signed by the card sig.verify(signedData); // Test card signature - this always returns false </code></pre> <p>I then tried to create the signature on the Java client (for testing) - and it turns out that the signature created on the Java client is different from the one created on the smartcard. I created it like this:</p> <pre><code>Signature sig = Signature.getInstance("SHA1withRSA"); sig.initSign(rsaPrivateKey); sig.update(data); locallySigned = sig.sign(); </code></pre> <p>Now I understand that the signature is something like the hash of (passed data + the used algorithm). Is it possible that the implementations are not compatible here? Am I missing something else? Thanks!</p> <p>PS: Yes, I verified that both input and output are transferred correctly from/to the card, that the key parameters are set and that input/output are exactly the same.</p> <p><strong>Edit:</strong> Key Generation in Java:</p> <pre><code>// Create a key-pair and install the private key on the card KeyPairGenerator keyGen = KeyPairGenerator.getInstance("RSA"); SecureRandom random = SecureRandom.getInstance("SHA1PRNG", "SUN"); keyGen.initialize(1024, random); KeyPair keyPair = keyGen.genKeyPair(); privateKey = (RSAPrivateKey)keyPair.getPrivate(); publicKey = (RSAPublicKey)keyPair.getPublic(); </code></pre> <p>and then I'm setting exp and mod of the private key on the card.</p>
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