STRUCT SGX_SIGSTRUCT(9)

okay bestie, this is struct sgx_sigstruct(9) from the Kernel API Manual — the enclave signature page, and it's giving signed-struct main character energy 🔥

🎀 NAME 🎀

struct sgx_sigstruct — an enclave signature. That's the whole vibe: it's the signature struct for an enclave, periodt. 💖

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✨ SYNOPSIS ✨

struct sgx_sigstruct {
    struct sgx_sigstruct_header header;
    u8 modulus[SGX_MODULUS_SIZE];
    u32 exponent;
    u8 signature[SGX_MODULUS_SIZE];
    struct sgx_sigstruct_body body;
    u8 reserved4[12];
    u8 q1[SGX_MODULUS_SIZE];
    u8 q2[SGX_MODULUS_SIZE];
};

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👑 Members 👑

• header — defines author of the enclave. Okay so this is the "who made this" part ✨
• modulus — the modulus of the public key. Big RSA math energy 🔥
• exponent — the exponent of the public key. The other half of the public-key moment 💅
• signature — the signature calculated over the fields except modulus, (and yes, that comma is in the original, bestie — we're keeping it 💅)
• body — defines contents of the enclave. This is the "what's inside" part 🫶
• q1 — a value used in RSA signature verification. Cryptography bestie behavior 🔐
• q2 — a value used in RSA signature verification. q1's little verification partner, no cap 🌸

psst: the synopsis also has u8 reserved4[12]; — it's in the struct, but this page doesn't give it its own member line, so we are absolutely not inventing lore for it 🙈

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💜 Description 💜

The header and body are the parts that are actual signed. The remaining fields define the signature of the enclave. That's it, that's the tea — header + body get signed, and the rest of the struct is the signature situation ✨

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🌈 SEE ALSO 🌈

Kernel file ./arch/x86/include/asm/sgx.h — yes, that exact path, bestie 🦋

• SGX_ENCLS_FAULT_FLAG(9)
• enum sgx_return_code(9)
• enum sgx_miscselect(9)
• enum sgx_attribute(9)
• struct sgx_secs(9)
• enum sgx_tcs_flags(9)
• struct sgx_tcs(9)
• struct sgx_pageinfo(9)
• enum sgx_page_type(9)
• enum sgx_secinfo_flags(9)
• struct sgx_secinfo(9)
• struct sgx_pcmd(9)
• struct sgx_sigstruct_header(9)
• struct sgx_sigstruct_body(9)

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mwah 💋 — source/version-line vibes: ./arch/x86/include/asm, date October 2026, page struct sgx_sigstruct(9). That's the whole footer, periodt 🫶