STRUCT DBC_USER_NONCE(9)

💖 NAME 💖

struct dbc_user_nonce(9) — the nonce exchange structure, and yes it’s both input and output. This is straight from the Kernel API Manual, bestie, and it’s giving “tiny struct, big authentication energy.” 💅

🦋 SYNOPSIS 🦋

       struct dbc_user_nonce {
           __u32 auth_needed;
           __u8 nonce[DBC_NONCE_SIZE];
           __u8 signature[DBC_SIG_SIZE];
        };

🎀 Members 🎀

• auth_needed — whether the PSP should authenticate this request (input). It’s a __u32, and the vibes are very specific: 0 means no authentication, and the PSP will return a single use nonce. 1 means authentication, and the PSP will return a multi-use nonce. Lowkey a whole personality switch for one little number. ✨
• nonce — an 8 byte value used for future authentication (output). It lives in the __u8 nonce[DBC_NONCE_SIZE] field, and it’s literally the little future-auth token of the group. 🎀
• signature — optional 32 byte signature created by software using a previous nonce (input). It’s chillin’ in the __u8 signature[DBC_SIG_SIZE] field, and it is optional, so no pressure. 🦋

🌈 SEE ALSO 🌈

Go peek at these, bestie — they’re all in the same lore:

• Kernel file ./include/uapi/linux/psp-dbc.h
• AMD Dynamic Boost Control (DBC) interface(9)
• struct dbc_user_setuid(9)
• struct dbc_user_param(9)
• DBCIOCNONCE(9)
• DBCIOCUID(9)
• DBCIOCPARAM(9)
• enum dbc_cmd_msg(9)

Ok that’s the whole page, periodt. 💖 This one’s sourced from ./include/uapi/linux and dated October 2026 — mwah, bye bestie! 👑🌸