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POTripleDES algorithm: from .NET to Java
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copied!<p>I have this vb.net code ( but I think meaning code is equivalent for c# too) that I have to replicate in Java and <strong>I can't modify</strong> it in anyway (just replicate):</p> <pre><code>Public Shared Function Encrypt(ByVal plainText As String, Optional key As String = "") As String If String.IsNullOrEmpty(key) Then key = "sfdjf48mdfdf3054" Dim encrypted As String = Nothing Try Dim inputBytes As Byte() = ASCIIEncoding.ASCII.GetBytes(plainText) Dim pwdhash As Byte() = Nothing 'generate an MD5 hash from the password. 'a hash is a one way encryption meaning once you generate 'the hash, you cant derive the password back from it. Dim hashmd5 As New MD5CryptoServiceProvider() pwdhash = hashmd5.ComputeHash(ASCIIEncoding.ASCII.GetBytes(key)) hashmd5 = Nothing ' Create a new TripleDES service provider Dim tdesProvider As New TripleDESCryptoServiceProvider() tdesProvider.Key = pwdhash tdesProvider.Mode = CipherMode.ECB encrypted = Convert.ToBase64String(tdesProvider.CreateEncryptor().TransformFinalBlock(inputBytes, 0, inputBytes.Length)) Catch e As Exception Dim str As String = e.Message Throw End Try Return encrypted End Function </code></pre> <p>Exactly, this is a .NET Utility Class function.</p> <p>Now,</p> <p>I don't know how to replicate</p> <pre><code>TripleDESCryptoServiceProvider() </code></pre> <p>In java code I began to write some code, but I don't know how to continue:</p> <pre><code>public static String encrypt(String plaintext, String enctoken){ if(enctoken == null) enctoken = "sfdjf48mdfdf3054"; String encrypted = null; byte[] plaintextByte = EncodingUtils.getAsciiBytes(plaintext); //nel caso non funzionasse provare getBytes semplicemente byte[] pwd = EncodingUtils.getAsciiBytes(Connessione.md5(enctoken)); try { Cipher cipher = Cipher.getInstance("DESEDE/ECB/NoPadding"); SecretKeySpec myKey = new SecretKeySpec(pwd,"DESede"); cipher.init( Cipher.ENCRYPT_MODE, myKey); try { byte[] encryptedPlainText= cipher.doFinal(plaintextByte); encrypted = Base64.encodeToString(encryptedPlainText, 0); return encrypted; } catch (IllegalBlockSizeException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (BadPaddingException e) { // TODO Auto-generated catch block e.printStackTrace(); } } catch (NoSuchAlgorithmException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (NoSuchPaddingException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (InvalidKeyException e) { // TODO Auto-generated catch block e.printStackTrace(); } return ""; } </code></pre> <p><strong>UPDATE:</strong></p> <p>I've just updated code. Now should be good. Enctoken String will be a string data rappresentation (just known). In this way, only if second parameter is NULL then fixed key is setted</p> <p><strong>UPDATE 2</strong></p> <p>Unfortunally c# hash is always different from Java hash!! How to replicate this in java ??</p> <pre><code> Dim hashmd5 As New MD5CryptoServiceProvider() pwdhash = hashmd5.ComputeHash(ASCIIEncoding.ASCII.GetBytes(key)) hashmd5 = Nothing ' Create a new TripleDES service provider Dim tdesProvider As New TripleDESCryptoServiceProvider() tdesProvider.Key = pwdhash tdesProvider.Mode = CipherMode.ECB encrypted = Convert.ToBase64String(tdesProvider.CreateEncryptor().TransformFinalBlock(inputBytes, 0, inputBytes.Length)) </code></pre> <p>I tried in this way but it doesn't work:</p> <p><strong>HASH</strong></p> <pre><code>public static final String md5(byte[] s) { try { MessageDigest m = MessageDigest.getInstance("MD5"); byte[] digest = m.digest(s); String hash = EncodingUtils.getAsciiString(digest, 0, 16); Log.i("MD5", "Hash: "+hash); return hash; } catch (NoSuchAlgorithmException e) { e.printStackTrace(); } return ""; } </code></pre>

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