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How to extract a DES secret key
Modified on 2012/02/02 13:41
by
Administrator
Categorized as
CSharp
Secret (simmetric) keys can be extracted from the token if the token allows extractions and/or the key is marked as extractable. This is a snippet to extract the value of a DES secret key: @@// Searchs for an DES private key object CryptokiCollection template = new CryptokiCollection(); template.Add(new ObjectAttribute(ObjectAttribute.CKA_CLASS, CryptokiObject.CKO_SECRET_KEY)); template.Add(new ObjectAttribute(ObjectAttribute.CKA_KEY_TYPE, Key.CKK_DES)); // this may be: Key.CKK_DES2, Key.CKK_DES3, Key.CKK_AES, etc. // Launches the search specifying the template just created CryptokiCollection objects = session.Objects.Find(template, 1); if(objects.count == 0) { // KEY NOT FOUND return false; } // takes the first object as key SecretKey secretKey = (SecretKey)objects[0]; // check if extractable if(!secretKey.Extractable) { // NOT EXTRACTABLE return false; } // Extracts the key value byte[] keyValue= secretKey.KeyValue; @@
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