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POEncryption / Decryption using Rijndael with key 256bit on Android
 

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  1. POEncryption / Decryption using Rijndael with key 256bit on Android
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    <p>I am developing an Android application that consumes a WS. For exchange of information between the android application and WebService, you must use the algorithm encryption / decryption Rijndael with 256 bit key.</p> <p>That is, all the information returned from the WS, will be encrypted, so I decrypts them using the algorithm.</p> <p>Likewise, all the information I send to WS should be encrypted. Therefore, I will use the encryption algorithm.</p> <p>I have not found the Rijndael ready to be used in the android platform. But I have the same algorithm in C #.</p> <pre><code>public class KeydKey { public KeydKey() { } #region Metodos de Criptografia #region key public string key(string vstrTextToBeEncrypted, string vstrEncryptionKey) { byte[] bytValue; byte[] bytKey; byte[] bytEncoded; byte[] bytIV = { 121, 241, 10, 1, 132, 74, 11, 39, 255, 91, 45, 78, 14, 211, 22, 62 }; int intLength; int intRemaining; MemoryStream objMemoryStream = new MemoryStream(); CryptoStream objCryptoStream; RijndaelManaged objRijndaelManaged; //O valor deve estar dentro da tabela ASCII (i.e., no DBCS chars) bytValue = Encoding.UTF32.GetBytes(vstrTextToBeEncrypted.ToCharArray()); intLength = vstrEncryptionKey.Length; /* ******A chave cifrada será de 256 bits long (32 bytes) ****** Se for maior que 32 bytes então será truncado. ****** Se for menor que 32 bytes será alocado. ****** Usando upper-case Xs */ if (intLength &gt;= 32) { vstrEncryptionKey = vstrEncryptionKey.Substring(0, 32); } else { intLength = vstrEncryptionKey.Length; intRemaining = 32 - intLength; string tmp = ""; vstrEncryptionKey = vstrEncryptionKey + tmp.PadRight(intRemaining, 'X'); } bytKey = Encoding.ASCII.GetBytes(vstrEncryptionKey.ToCharArray()); objRijndaelManaged = new RijndaelManaged(); /* ****** Cria o valor a ser crifrado e depois escreve ****** Convertido em uma disposição do byte */ try { objCryptoStream = new CryptoStream(objMemoryStream, objRijndaelManaged.CreateEncryptor(bytKey, bytIV), CryptoStreamMode.Write); objCryptoStream.Write(bytValue, 0, bytValue.Length); objCryptoStream.FlushFinalBlock(); bytEncoded = objMemoryStream.ToArray(); objMemoryStream.Close(); objCryptoStream.Close(); return Convert.ToBase64String(bytEncoded); } catch (Exception ex) { return null; } } #endregion #region dkey public string dkey(string vstrstringToBeDecrypted, string vstrDecryptionKey) { byte[] bytDataToBeDecrypted; byte[] bytTemp = new byte[0]; byte[] bytIV = { 121, 241, 10, 1, 132, 74, 11, 39, 255, 91, 45, 78, 14, 211, 22, 62 }; MemoryStream objMemoryStream = new MemoryStream(); CryptoStream objCryptoStream; RijndaelManaged objRijndaelManaged; byte[] bytDecryptionKey; int intLength; int intRemaining; string strReturnstring = string.Empty; //Convert base64 cifrada para byte array bytDataToBeDecrypted = Convert.FromBase64String(vstrstringToBeDecrypted); intLength = vstrDecryptionKey.Length; /* ******A chave cifrada será de 256 bits long (32 bytes) ****** Se for maior que 32 bytes então será truncado. ****** Se for menor que 32 bytes será alocado. ****** Usando upper-case Xs */ if (intLength &gt;= 32) { vstrDecryptionKey = vstrDecryptionKey.Substring(0, 32); } else { intLength = vstrDecryptionKey.Length; intRemaining = 32 - intLength; string tmp = ""; vstrDecryptionKey = vstrDecryptionKey + tmp.PadRight(intRemaining, 'X'); } bytDecryptionKey = Encoding.ASCII.GetBytes(vstrDecryptionKey.ToCharArray()); objRijndaelManaged = new RijndaelManaged(); Array.Resize(ref bytTemp, bytDataToBeDecrypted.Length); objMemoryStream = new MemoryStream(bytDataToBeDecrypted); try { objCryptoStream = new CryptoStream(objMemoryStream, objRijndaelManaged.CreateDecryptor(bytDecryptionKey, bytIV), CryptoStreamMode.Read); objCryptoStream.Read(bytTemp, 0, bytTemp.Length); //objCryptoStream.FlushFinalBlock(); objMemoryStream.Close(); objCryptoStream.Close(); return Encoding.UTF32.GetString(bytTemp).Replace("\0", ""); } catch (Exception ex) { return null; } } #endregion #endregion } </code></pre> <p>Someone tell me where I can get the algorithm for android? Or help me translate the algorithm that I have Java?</p> <p>Thank you!</p>
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    1. USTaynã Bonaldo
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    1. COIt might help to know that rijndael is AES.
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    2. COI did not understand how the implementation!
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    3. COJava's security platform is somewhat contrived in my opinion. try searching on google for "java AES encryption example"
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