Cari Blog Ini

Diberdayakan oleh Blogger.
Minggu, 14 Juni 2009

TripleDES encryption compatibility when using Java and .NET

TripleDES encryption compatibility when using Java and .NET - welcome to the blog Software Gadget the end of this much calm product information launcing, yes every day there are always products that are removed from various brands, both physical hardware products and software that need new knowledge to use it, well now we will discuss first about TripleDES encryption compatibility when using Java and .NET as you search we have collected a lot of data to make this information as complete as possible for you, please read:

Articles : TripleDES encryption compatibility when using Java and .NET
full Link : TripleDES encryption compatibility when using Java and .NET

You can also see our article on:


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;
}



so much information TripleDES encryption compatibility when using Java and .NET

hopefully the information TripleDES encryption compatibility when using Java and .NET that we provide can be useful for you in the set of technology products that fit your daily needs,

have just read the article titled TripleDES encryption compatibility when using Java and .NET if you feel useful information and you want to bookmark or share please use the link https://ramblingsofker.blogspot.com/2009/06/tripledes-encryption-compatibility-when.html and do not forget to go back to this blog if you want to know information about the latest gadgets.

Tag :
Share on Facebook
Share on Twitter
Share on Google+
Tags :

Related : TripleDES encryption compatibility when using Java and .NET

0 komentar:

Posting Komentar