MacTripleDes (.NET managed and CryptoApi unmanaged interop)

From: casey chesnut (casey_at_brains-N-brawn.com)
Date: 10/07/03 

Date: Mon, 6 Oct 2003 18:16:23 -0500

I need to do both keyed hashes (MacTripleDes and HmacSha1).
I can do HmacSha1 using pInvokes to the CryptoApi,
and then get the same hash value using .NET.

But I am not having the same luck with MacTripleDes.
On the managed side all i do is:
MACTripleDES mtd = new MACTripleDES(_key);
byte [] mHash = mtd.ComputeHash(_value);

For the cryptoApi, its something like this:
//get TripleDes key handle
IntPtr key = CryptGenKey(prov, Calg.TRIP_DES, GenKeyParam.EXPORTABLE);
//get 24 byte key as byte [] 'baKey' using nullKey export hack, and then
reverse it
IntPtr hash = CryptCreateHash(prov, Calg.MAC, key);
HashData(baKey, data);
byte [] hashVal = CryptGetHashParam(hash);
CryptDestroyHash(hash);
CryptDestroyKey(key);

Any ideas?

Thanks
casey

Relevant Pages

  • MacTripleDes (.NET managed and CryptoApi unmanaged interop)
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