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POJava Digital Signature different to C#
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  1. POJava Digital Signature different to C#
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    copied!<p>I have the following c# code to generate a digital signature from a private key:</p> <pre><code> static string Sign(string text, string certificate) { X509Certificate2 cert = new X509Certificate2(certificate, "TestPassword", X509KeyStorageFlags.Exportable); RSACryptoServiceProvider rsa = (RSACryptoServiceProvider)cert.PrivateKey; // Hash the data SHA1Managed sha1 = new SHA1Managed(); ASCIIEncoding encoding = new ASCIIEncoding(); byte[] data = encoding.GetBytes(text); byte[] hash = sha1.ComputeHash(data); // Sign the hash return System.Convert.ToBase64String(rsa.SignHash(hash, CryptoConfig.MapNameToOID("SHA1"))); } </code></pre> <p>I then created what I thought was the equivalent java code:</p> <pre><code>public static String signData(String dataToSign, String keyFile) { FileInputStream keyfis = null; try { keyfis = new FileInputStream(fileName); KeyStore store = KeyStore.getInstance("PKCS12"); store.load(keyfis, "TestPassword".toCharArray()); KeyStore.PrivateKeyEntry pvk = (KeyStore.PrivateKeyEntry)store. getEntry("testkey", new KeyStore.PasswordProtection("TestPassword".toCharArray())); PrivateKey privateKey = (PrivateKey)pvk.getPrivateKey(); byte[] data = dataToSign.getBytes("US-ASCII"); MessageDigest md = MessageDigest.getInstance("SHA1"); byte[] hashed = md.digest(data); Signature rsa = Signature.getInstance("SHA1withRSA"); rsa.initSign(privateKey); rsa.update(data); return Base64.encode(rsa.sign()); } catch (Exception ex) { Logger.getLogger(this.getClass().getName()).log(Level.SEVERE, null, ex); } finally { if ( keyfis != null ) { try { keyfis.close() } catch (Exception ex) { keyfis = null; } } } return null; } </code></pre> <p>Unfortunately the digital signatures do not match.</p> <p>Any assistance will be greatly appreciated. Thanks in advance.</p> <p><strong>EDIT</strong>: If I remove the MessageDigest from the java code then the output is the same. Why? I thought hashing is needed.</p> <p>Regards, Eugene</p>
 

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