3 DES with 32 byte key Length with Visual Basic DES Class to decipher an IBM 3624 Pinblock

Hey guys,

I have a problem on my hands at the moment as I am trying to decrypt a string with 16 bytes and 2 key components of 32 bytes. As below:

Key component 1 = F457E52AB083BCECA17F230B23B36B34
Key component 2 = 6D52616E5D755B4ADA948F31ECD5107C

Encrypted block = 2C187291DCEEB9B9

From what I have picked up the visual basic DES class does not support that. Is any way I get round this.

.NET Development5

The .NET Framework Supports TripleDES encryption however I was given an invalid data for that.

Same issue with me there. Can this be a bug or what.

I guess thats why you are an MVP. let me look at it again

Thanks

I don't suppose you know what the decrypted result is supposed to be

skimming through CCA Release 2.41 on IBM's website may yield necessary information. From what I read about people attacking IBM 3624 there are certain offsets applied before encrypting/decrypting.

I basically know that I am supposed to have a return value in the format of 1234FFFFFFFFFFFF. All hex values, with F being used for padding.