LIBRESSL-SSL_GET_EX_DATA_X509_STORE_CTX_IDX(3)

🎀 NAME 🎀

okay so this is the manual page for SSL_get_ex_data_X509_STORE_CTX_idx(3) from the Library Functions Manual, and it is literally all about getting the ex_data index you use to access the SSL structure from an X509_STORE_CTX. bestie, it's giving “tiny function, very specific job” energy 💅

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🌟 SYNOPSIS 🌟

here's the summoning spell, exactly as written:

library “libssl” libcrypto #include <openssl/ssl.h>

int
SSL_get_ex_data_X509_STORE_CTX_idx(void);

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💖 DESCRIPTION 💖

SSL_get_ex_data_X509_STORE_CTX_idx() returns the index number under which the pointer to the SSL object is stored into the X509_STORE_CTX object. no cap, that's the whole vibe of the function 🫶

Whenever an X509_STORE_CTX object is created for the verification of the peer's certificate during a handshake, a pointer to the SSL object is stored into the X509_STORE_CTX object to identify the connection affected. so yes, it's the little breadcrumb that tells you which connection you're looking at 🌸

To retrieve this pointer, the X509_STORE_CTX_get_ex_data(3) function can be used with the correct index. and this index is globally the same for all X509_STORE_CTX objects, which is honestly so convenient of it ✨ it can be retrieved using SSL_get_ex_data_X509_STORE_CTX_idx(). the index value is set when SSL_get_ex_data_X509_STORE_CTX_idx() is first called either by the application program directly or indirectly during other SSL setup functions or during the handshake. iykyk 💫

The value depends on other index values defined for X509_STORE_CTX objects before the SSL index is created. so it's not just out here making up numbers for fun — it's got dependencies, like every main character 😭

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🦋 RETURN VALUES 🦋

• ≥0 — the index value to access the pointer. slay, you got your index 💖
• <0 — an error occurred, check the error stack for a detailed error message. not the vibe, but at least the stack is there to spill the tea 💀

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🌈 EXAMPLES 🌈

The index returned from SSL_get_ex_data_X509_STORE_CTX_idx() provides access to the SSL object for the connection during verify_callback() when checking the peer's certificate. check the example in SSL_CTX_set_verify(3) — that's where the demo lives, bestie 👑✨

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👑 SEE ALSO 👑

go peek at these icons:

• CRYPTO_set_ex_data(3)
• ssl(3)
• SSL_CTX_set_verify(3)

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🧚 HISTORY 🧚

SSL_get_ex_data_X509_STORE_CTX_idx() first appeared in SSLeay 0.9.1 and has been available since OpenBSD 2.6. honestly? longevity icon behavior 💅🫶

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cute little sign-off: this page is from Debian, dated August 25,, and the footer title is SSL_GET_EX_DATA_X509_STORE_CTX_IDX(3). mwah, go call your ex_data with the right index 💖✨🎀