to MS people !!!

From: Oleg (anonymous_at_discussions.microsoft.com)
Date: 11/24/03

  • Next message: Michel Gallant: "How banks protect their data integrity" 
    Date: Mon, 24 Nov 2003 06:14:24 -0800

    Hello MS people !!!

    I'm trying to realize how CryptDeriveKey() works !!!
    I'm creating 24 bytes length symmetric key for 3DES
    algorithm. These are the steps I do (WITH
    PROV_RSA_SCHANNEL):

    1. CryptCreateHash(.... CALG_MD5.....);
    2. CryptHashData( 24 bytes array {1,2,3,4,5...24})
    3. CryptDeriveKey(... CALG_3DES....)
    4. encrypt the data....

    and here I want to see the real key data:
    5. CryptExportKey( .... PLAINTEXTKEYBLOB ....)
       the return data DOESN'T look like something
    understandable !!!

    THE QUESTION:
    How the key is derived ???? How it's created ??? This data
    doesn't look like something at least similar to MD5 hash
    of intial key data.
    I'm fighting with C++ client and C# server that DON'T
    understand each other !!! In C# I use the same key that is
    passed to CryptHashData() at the client side.

    Thanks in advance !!!

  • Next message: Michel Gallant: "How banks protect their data integrity"