X509_OCSPID_PRINT(3)

okay bestie, welcome to the X509_OCSPID_PRINT(3) page 💅 the manual name is literally right there, and the whole vibe is pretty-printing hashes of a subject name and public key. slay.

🎀 NAME 🎀

X509_ocspid_print — pretty-print hashes of subject name and public key. no cap, that's the assignment. ✨

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✨ SYNOPSIS ✨

library “libcrypto” #include <openssl/x509.h>

int
X509_ocspid_print(BIO *bio, X509 *issuer);

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🌸 DESCRIPTION 🌸

X509_ocspid_print() produces human-readable output to bio containing hexadecimal representations of SHA-1 hashes of the DER-encoded forms of the subject name and the public key of the issuer certificate, as these hashes appear in OCSP requests. 🦋

like, that's the whole function's main character moment: hex representations, SHA-1 hashes, DER-encoded forms, subject name + public key, issuer certificate, OCSP requests. iconic. 👑

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💀 RETURN VALUES 💀

X509_ocspid_print() returns 1 for success or 0 for failure. that's it, bestie — 1 slays, 0 does not. 😭

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🎀 EXAMPLES 🎀

This function is used by the -ocspid flag of the openssl(1) x509 command. periodt. 💅

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👑 SEE ALSO 👑

go read these when you're done, iykyk:

• EVP_sha1(3)
• i2d_X509_NAME(3)
• OCSP_cert_to_id(3)
• OCSP_REQUEST_new(3)
• X509_get_pubkey(3)
• X509_get_subject_name(3)

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🌈 HISTORY 🌈

X509_ocspid_print() first appeared in OpenSSL 0.9.7 and has been available since OpenBSD 3.2. vintage behavior fr fr. 🫶

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xoxo, this page is from Debian, dated June 8, 2025, and the manual is X509_OCSPID_PRINT(3) 💖✨