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POHow to use 3DES algorithm on Android?
 

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  1. POHow to use 3DES algorithm on Android?
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    <p>On the server side, the encyption/decryption of the password field is done in C#.</p> <p>Now, i need to implement same functionality in my android application. So, i followed this tutorial: <a href="http://ttux.net/post/3des-java-encrypter-des-java-encryption/" rel="nofollow">http://ttux.net/post/3des-java-encrypter-des-java-encryption/</a> as below:</p> <pre><code> import java.security.MessageDigest; import java.security.spec.KeySpec; import java.util.Arrays; import javax.crypto.Cipher; import javax.crypto.SecretKey; import javax.crypto.SecretKeyFactory; import javax.crypto.spec.DESedeKeySpec; import javax.crypto.spec.IvParameterSpec; import org.apache.commons.codec.binary.Base64; public class Encrypter { private KeySpec keySpec; private SecretKey key; private IvParameterSpec iv; public Encrypter(String keyString, String ivString) { try { final MessageDigest md = MessageDigest.getInstance("md5"); final byte[] digestOfPassword = md.digest(Base64.decodeBase64(keyString.getBytes("utf-8"))); final byte[] keyBytes = Arrays.copyOf(digestOfPassword, 24); for (int j = 0, k = 16; j &lt; 8;) { keyBytes[k++] = keyBytes[j++]; } keySpec = new DESedeKeySpec(keyBytes); key = SecretKeyFactory.getInstance("DESede").generateSecret(keySpec); iv = new IvParameterSpec(ivString.getBytes()); } catch(Exception e) { e.printStackTrace(); } } public String encrypt(String value) { try { Cipher ecipher = Cipher.getInstance("DESede/CBC/PKCS5Padding","SunJCE"); ecipher.init(Cipher.ENCRYPT_MODE, key, iv); if(value==null) return null; // Encode the string into bytes using utf-8 byte[] utf8 = value.getBytes("UTF8"); // Encrypt byte[] enc = ecipher.doFinal(utf8); // Encode bytes to base64 to get a string return new String(Base64.encodeBase64(enc),"UTF-8"); } catch (Exception e) { e.printStackTrace(); } return null; } public String decrypt(String value) { try { Cipher dcipher = Cipher.getInstance("DESede/CBC/PKCS5Padding","SunJCE"); dcipher.init(Cipher.DECRYPT_MODE, key, iv); if(value==null) return null; // Decode base64 to get bytes byte[] dec = Base64.decodeBase64(value.getBytes()); // Decrypt byte[] utf8 = dcipher.doFinal(dec); // Decode using utf-8 return new String(utf8, "UTF8"); } catch (Exception e) { e.printStackTrace(); } return null; } } </code></pre> <p>but i dont know what values i need to provide for KeyValue and ivValue for the above code. Please help me...</p>
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