TripleDES encryption compatibility when using Java and .NET - welcome to our blog that presents the full content How Gadget, the discussion this time we're discussing that you find that TripleDES encryption compatibility when using Java and .NET, we have provided complete information with images that are easy to understand, the explanation is simple but complete, therefore please read until the end :)

This is about : TripleDES encryption compatibility when using Java and .NET
And this article : TripleDES encryption compatibility when using Java and .NET

TripleDES encryption compatibility when using Java and .NET

Note: This article shows you how to generate a SecretKey to use with a TripleDES encryption cipher. The shared-secret key can be 24 byte or even 16 bytes long.

For a quick brief of how TripleDES (3DES) works have a look here.

The most common problem related to encrypting something in Java and decrypting in .NET or vice-versa is a misunderstanding of the Keying options that are defined in the standards and those implemented by Java and .NET

A DES key is made up of 56 bits and 8 parity bits (8 bytes)

A 3DES key is made up of a bunch of 3, 8-byte DES keys i.e. a 24 bytes long

If you are going to use a 24 byte key for both Java and .NET, you're safe; then encryption will be compatible.

Java will force you to use only a 24 byte key when using TripleDES; the subtly is that .NET supports both a 16 byte as well as a 24 byte key.

Now If you generate a key from a MD5 hash of a shared secret, it will be just 16 bytes. .NET has no problem with this. It implements Keying Option 2. It will intelligently take the first 8 bytes and append it after the 16th byte - forming a 24 byte key. Java, *sigh* sadly doesn't do this. You'll have to spoon feed it like so:

public SecretKey getSecretKey(byte[] encryptionKey) {
 SecretKey secretKey = null;
 if (encryptionKey == null)
   return null;

byte[] keyValue = new byte[24]; // final 3DES key

if (encryptionKey.length == 16) {
 // Create the third key from the first 8 bytes
 System.arraycopy(encryptionKey, 0, keyValue, 0, 16);
 System.arraycopy(encryptionKey, 0, keyValue, 16, 8);

} else if (encryptionKey.length != 24) {
 throw new IllegalArgumentException("A TripleDES key should be 24 bytes long");

} else {
 keyValue = encryptionKey;
}
 DESedeKeySpec keySpec;
try {
 keySpec = new DESedeKeySpec(keyValue);
 SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DESede");
 secretKey = keyFactory.generateSecret(keySpec);
} catch (Exception e) {
 throw new RuntimeException("Error in key Generation",e);
}
 return secretKey;
}

Information TripleDES encryption compatibility when using Java and .NET has been completed we present

A few of our information about the TripleDES encryption compatibility when using Java and .NET, we hope you benefit from this article

You have just read the article TripleDES encryption compatibility when using Java and .NET and many articles about gadget in our blog this, please read it. and url link of this article is https://howtomonetizeeverything.blogspot.com/2009/06/tripledes-encryption-compatibility-when.html Hopefully discussion articles on provide more knowledge about the world of tech gadgets.

Tag :

Tweet