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POPkcs7 padding in java
 

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  1. POPkcs7 padding in java
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    <p>Iam using TripleDes /cbc/pkcs7padding in C#.net to encrypt file. and i need to decrypt in java.In java am using DESede/CBC/PKcs5padding But the file is decrypted,but corrupted.</p> <p>*In java is it possible to use pkcs7padding? or any other solution to decrypt the file in java with encrypted using pkcs7 padding</p> <p>C# code</p> <pre><code>namespace EncryptEpubFiles { public class Encryptor { public static bool EncryptBook(FileInfo fileToEncrypt,string outPathWithoutExtension,string keyString) { try { byte[] encryptedFileByteArray; //Start Encryption service provider TripleDESCryptoServiceProvider tDES = new TripleDESCryptoServiceProvider(); //Read all bytes from input file byte[] _fileByteArray = File.ReadAllBytes(fileToEncrypt.FullName); tDES.Key = GetBytes(keyString); tDES.Mode = CipherMode.CBC; //tDES.Padding = PaddingMode.PKCS7; tDES.Padding = PaddingMode.PKCS7; ICryptoTransform trans = tDES.CreateEncryptor(); //Create Encrypted file byte array encryptedFileByteArray = (trans.TransformFinalBlock(_fileByteArray, 0, ((_fileByteArray).Length))); //Write Encrypted file byte array to a filr with proper extension System.IO.File.WriteAllBytes((outPathWithoutExtension + ".akr"), encryptedFileByteArray); return true; } catch (Exception ex) { return false; } } </code></pre> <p>Java code</p> <pre><code>public class DecryptFinal { private static Cipher dcipher; private static byte[] iv = { (byte)0xB2, (byte)0x12, (byte)0xD5, (byte)0xB2, (byte)0x44, (byte)0x21, (byte)0xC3, (byte)0xC3 }; public static void main(String[] args){ try { String s = "123456789123456789111234"; AlgorithmParameterSpec paramSpec = new IvParameterSpec(iv); SecretKeyFactory keyfactory=SecretKeyFactory.getInstance("DESede"); byte[] encodedkey=s.getBytes(); System.out.println(); SecretKey key = keyfactory.generateSecret(new DESedeKeySpec(encodedkey)); System.out.println(new DESedeKeySpec(encodedkey)); SecretKeySpec(encodedKey,0,encodedKey.length,"DESede" ); dcipher = Cipher.getInstance("DESede/CBC/PKCS5Padding"); dcipher.init(Cipher.DECRYPT_MODE, key, paramSpec); FileInputStream fs =new FileInputStream("E:\\Test1\\Test1\\Encrypted Files\\Wedding bells.akr"); FileOutputStream os= new FileOutputStream("E:\\Test1\\Test1\\Encrypted Files\\Encrypted Files\\E-pub Totorials"); byte[] buf = new byte[1024];// bytes read from stream will be decrypted CipherInputStream cis = new CipherInputStream(fs, dcipher);// read in the decrypted bytes and write the clear text to out int numRead = 0; while ((numRead = cis.read(buf)) &gt;= 0) { os.write(buf, 0, numRead); } cis.close();// close all streams fs.close(); os.close(); } catch(FileNotFoundException e) { System.out.println("File Not Found:" + e.getMessage()); return; } 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(); } catch (InvalidAlgorithmParameterException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { System.out.println("I/O Error:" + e.getMessage()); } catch (InvalidKeySpecException e) { // TODO: handle exception e.printStackTrace(); } </code></pre>
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    1. COPKCS #7 padding is compatible with PKCS #5 padding. Your problem must lie elsewhere. Show the code for encryption in C# and decryption in Java. As a complete shot in the dark, I wonder if you are correctly specifying the IV value on both sides.
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      1. POPkcs7 padding in java
      1. USDuncan Jones
    2. COAs Duncan Jones noted you must use the same IV on the decrypt side that you used on the encrypt side. Must we point out that you didn't do that?
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      1. POPkcs7 padding in java
      1. USJames K Polk
    3. COAnother source of error may be the character encoding used for your key string s. Explicitly specify UTF-8 or whatever on both sides when moving from characters to bytes.
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      1. USrossum
 

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