Command A3: Write Crypto Stuff (Sony calls it "Send Key")

00: BYTE  Command byte A3
01: BYTE  unused, send as Zero (might contain LUN)
02: DWORD Object Number
06: BYTE  unsused, send as Zero
07: BYTE  Magic Byte BD
08: WORD  Size of cryptographic data
0A: BYTE  key type
0B: BYTE  unused, send as Zero

Command A4: Read Crypto Stuff (Sony calls it "Request Key")

00: BYTE  Command byte A4
01: BYTE  unused, send as Zero (might contain LUN)
02: DWORD Object Number
06: BYTE  unsused, send as Zero
07: BYTE  Magic Byte BD
08: WORD  Size of cryptographic data
0A: BYTE  key type
0B: BYTE  unused, send as Zero