Techno Life, Micromax New Version Official Firmware, Winmax official firmware, Nokia Flash File, WhatsApp Messenger, Lenovo, huawei, xiaomi, samsung galaxy

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 - these days more and more blogs that talk about technology, including blogs Techno Life but we are very experienced in this case because we have been there from a few years ago always present information about techno for you, well now we are about TripleDES encryption compatibility when using Java and .NET hopefully the information we will convey can answer your question to google, please see:

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;
}



information TripleDES encryption compatibility when using Java and .NET has been discussed

hopefully the meaning of TripleDES encryption compatibility when using Java and .NET that we write can be useful for you in adding insight about gadgets.

you just finished reading the article titled TripleDES encryption compatibility when using Java and .NET if you want to bookmark or share your links use the link https://lifeandeating.blogspot.com/2009/06/tripledes-encryption-compatibility-when.html do not forget to go back to this blog if you want to get the latest information about 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