Hoe to convert a String to Triple DES Key

Hi
can Someone help me how to convert a string to TRipleDES key, some times the string can be less than
24 bytes ( but DESedeKeySpec needs at least 24 bytes).
thanks
chintha

I would take a slightly different approach than that offered by previous posts. This is from looking at what OpenSSL does for generating keys.
1) Do a String.getBytes() from your password (or String.getBytes("UTF-8") if you are using other than ASCII).
2) Generate a SHA-1 hash from the bytes. This gives you a 20 byte value.
3) Compute a SHA-1 hash of the original hash and the password. This will give you another 20 byte value.
4) Take the first 20 bytes from hash #1 and the first 4 bytes of hash #2 to get a 24 byte value.
5) Give the 24 byte value odd parity (this means that each byte has an odd number of 1 bytes). You'll need to write a bit of your own code to do this.
6) Finally, use this 24 byte, odd parity value to generate your DES key.
--Kevin

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In the applet definition part, I am having these definition:
public static final byte DEFAULT_PERSO_KEY_SET_REFERENCE = (byte) 0x81;
     public static final byte[] DEFAULT_PERSO_KEY_SET_ENC = {
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public Key keyEnc;
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keyEnc = (DESKey) KeyBuilder.buildKey(KeyBuilder.TYPE_DES, KeyBuilder.LENGTH_DES3_2KEY,
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               keyMac = (DESKey) KeyBuilder.buildKey(KeyBuilder.TYPE_DES, KeyBuilder.LENGTH_DES3_2KEY,
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Status: Wrong data
jcshell: Error code: 6a80 (Wrong data)
jcshell: Wrong response APDU: 6A80
Unexpected error; aborting execution

>
Status: Wrong data
jcshell: Error code: 6a80 (Wrong data)
jcshell: Wrong response APDU: 6A80
Unexpected error; aborting execution
>
usually unhandled exceptions do not look like this. If you catch the exception you can try to specify the reason. May be the problem in parity bits of des keys, though this error is not listed in possible exceptions of setKey method.

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Similar to this guy's problem: http://forum.java.sun.com/thread.jspa?messageID=3332692&#3332692
I am having an issue along the same lines... I'm writing a java client that is dealing with a C++ agent, which is expecting an encrypted TripleDES key. However when I create a DesEDE key, then encrypt it using a public RSA key, I am only sending 24 bytes, where the C++ code is expecting 32.
Luckily, I DO have a C++ client that is doing what I need to do, so I'm investigating exactly how they're doing with the padding/encoding in order to fix my problem. But it's using the crypto 5.1 library (crypto++ maybe) and its not the most readable code.
If anyone's done anything similar, I'd appreciate any tips/advice for how you dealt with it.
tOm

32/24 == 4/3 == the expansion ration converting bytes to Base64.
Is this a possibility?

Converting a byte array or hex string into DES key

i required to covert a hex represented of DES key into key object for cryptography operation to performed ...
can you help me to find out how to convert a hex representaion of key int DES key object

hi friend,
I think the key size is more than the required size. For DES algorithm, the key size is 64 bit long.But the code u have given has more than 64 bit, because of which this exception has been raised.
Reduce the key value to 64bit and try. If it doesnt work,try the code given below .I think it might be helpful for u
import javax.crypto.*;
import javax.crypto.spec.*;
public class Cryption
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          try
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     public byte[] decrypt(byte[] keyData,byte[] cipherMessage)
          try
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          catch(Exception e)
               e.printStackTrace();
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     public static void main(String[] args)
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          byte keyValue[] = keyString.getBytes();
          Cryption encryption = new Cryption();
          String Message = "Hello Welcome to world of Cryptography";
          System.out.println("Key Value (represented in HEX form): "+keyString);
          System.out.println("Key Value (represented in byte array form): "+keyValue);
          System.out.println("Original Message : "+Message);
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output :
Key Value (represented in HEX form): ABCDEF12
Key Value (represented in byte array form): [B@43c749
Original Message : Hello Welcome to world of Cryptography
Encrypted Message : "O3�?�M�,��,�]�3��R�?>C$
Decrypted Message : Hello Welcome to world of Cryptography
whenever u use any algorithm, first findout the key size or range that algorithm supports. It is very important
regards,
Deepa Raghuraman

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Thanks in advance,
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Hi trilok,
Please let me know what JCE provider you are using for decrypting the Key.
Please make sure that you have made the static or dynamic registration properly.
For Static registration:
Please go to JAVA_HOME/jre/lib/security/java.security
Please edit
security.provider.1=sun.security.provider.Sun
For Dynamic Registration
Security.addProvider(new com.sun.crypto.provider.SunJCE());
Also please refer this URL, which is the third party provider which supports RSA.
http://www.bouncycastle.org/latest_releases.html
I hope this will help you.
Thanks
Bakrudeen
Technical Support Engineer
Sun MicroSystems Inc, India

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Hi,
Thank you for your post! I would suggest posting your question in one of the MS Forums,
MSDN Forums » Windows Forms » Windows Forms General
located here:http://forums.microsoft.com/MSDN/ShowForum.aspx?ForumID=8&SiteID=1.
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Dear All,
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At line:1 char:1
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¯\_(ツ)_/¯

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Hoe to convert a String to Triple DES Key

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