IOCTL_AACS_GET_CHALLENGE_KEY IOCTL (ntddcdvd.h)
Queries the logical unit for the device's challenge key. The challenge key consists of a point on an elliptic curve and its associated signature.
Major code
Input buffer
The buffer at Irp->AssociatedIrp.SystemBuffer contains a value of type DVD_SESSION_ID that specifies an Authentication Grant Identifier (AGID). The AGID identifies the secure session.
Input buffer length
Length of a DVD_SESSION_ID.
Output buffer
The buffer at Irp->AssociatedIrp.SystemBuffer contains the drive challenge key with a format of AACS_CHALLENGE_KEY.
Output buffer length
Length of an AACS_CHALLENGE_KEY.
Status block
The Information field is set to the number of bytes transferred. The Status field is set to STATUS_SUCCESS or possibly STATUS_INSUFFICIENT_RESOURCES.
Remarks
The IOCTL_AACS_GET_CHALLENGE_KEY request corresponds to the step in the Advanced Access Content System (AACS) authentication algorithm (AACS-Auth) in which the drive provides the host with a point on the curve. For a complete description of AACS-Auth, see the Advanced Access Content System, Introduction and Common Cryptographic Elements specification that is published by Advanced Access Content System Licensing Administrator (AACS LA).
Requirements
| Requirement | Value |
|---|---|
| Header | ntddcdvd.h (include Ntddcdvd.h) |