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POEncrypt by "DES-EDE3-CBC" in ruby and decrypt in Java
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copied!<p>I am trying to encrypt data by the cipher "DES-EDE3-CBC" in Ruby, then decrypt the encrypted data in Java.</p> <p>Here is the code in Ruby I do the encrypting: </p> <pre><code>require 'digest' require 'openssl' require 'base64' ALG = "DES-EDE3-CBC" key = "80f28a1ef4aa9df6ee2ee3210316b98f383eb344" cipher = OpenSSL::Cipher::Cipher.new(ALG) cipher.pkcs5_keyivgen(key, nil) cipher.encrypt data = "hello" result = cipher.update(data) result << cipher.final # Write the data to file. File.open("enc.txt", "wb"){|f| f.write result} </code></pre> <p>Then decrypt in Java:</p> <pre><code>import java.security.*; import java.*; import java.io.*; import javax.crypto.*; import javax.crypto.spec.*; public class Test{ public static void main(String[] args) throws Exception { String key = "80f28a1ef4aa9df6ee2ee3210316b98f383eb344"; // Init the key DESKeySpec desKeySpec = new DESKeySpec(key.getBytes()); SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES"); Key secretKey = keyFactory.generateSecret(desKeySpec); Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding"); cipher.init(Cipher.DECRYPT_MODE, secretKey); byte[] buf = new byte[1024]; InputStream input = new FileInputStream(new File("enc.txt")); FileOutputStream output = new FileOutputStream(new File("dec.txt")); int count = input.read(buf); // Read and decrypt file content while (count >= 0) { output.write(cipher.update(buf, 0, count)); count = input.read(buf); } output.write(cipher.doFinal()); output.flush(); } } </code></pre> <p>But I always get the exception when running the Java code:</p> <pre><code>Exception in thread "main" javax.crypto.BadPaddingException: Given final block not properly padded at com.sun.crypto.provider.CipherCore.doFinal(CipherCore.java:811) at com.sun.crypto.provider.CipherCore.doFinal(CipherCore.java:676) at com.sun.crypto.provider.DESCipher.engineDoFinal(DESCipher.java:314) at javax.crypto.Cipher.doFinal(Cipher.java:1969) at Test.main(Test.java:29) </code></pre> <p>I think the problem is the "DES-EDE3-CBC" cipher in Ruby is not compatible with Java "DES/ECB/PKCS5Padding". How I can do it?</p>

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