EVP_PKCS82PKEY(3)

💅 EVP_PKCS82PKEY(3) — bestie edition

okay so this is a page from the libcrypto manual (yes, that libcrypto, the OpenSSL one 💖) and it's literally just two little functions that swap your key back and forth between EVP_PKEY and PKCS#8 PrivateKeyInfo. no cap, that's the whole vibe.

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✨ NAME ✨

EVP_PKCS82PKEY, EVP_PKEY2PKCS8 — convert between EVP_PKEY and PKCS#8 PrivateKeyInfo

like... they're a conversion duo 🫶 one goes this way, one goes that way.

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🌸 SYNOPSIS 🌸

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

EVP_PKEY *
EVP_PKCS82PKEY(const PKCS8_PRIV_KEY_INFO *keyinfo);

PKCS8_PRIV_KEY_INFO *
EVP_PKEY2PKCS8(EVP_PKEY *pkey);

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🎀 DESCRIPTION 🎀

• EVP_PKCS82PKEY() — extracts the private key from a PKCS#8 PrivateKeyInfo structure. it's giving "get the key out of the fancy wrapper" energy 🔥
• EVP_PKEY2PKCS8() — creates a PKCS#8 PrivateKeyInfo structure representing the private key contained in pkey. so it wraps your key up all pretty ✨

supported algorithms include DH, DSA, EC, and RSA. those four, periodt 👑

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💀 RETURN VALUES 💀

these functions return a newly allocated object, or NULL if the algorithm indicated in keyinfo or pkey is unsupported, or if memory allocation, decoding, or encoding fails.

so yeah bestie, always check for NULL — that's the vibe check 😭🙈

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🦋 SEE ALSO 🦋

• EVP_PKEY_base_id(3)
• EVP_PKEY_new(3)
• PKCS8_pkey_set0(3)
• PKCS8_PRIV_KEY_INFO_new(3)
• X509_ALGOR_get0(3)

go read these if you're nosy (respectfully) 💜

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🌈 HISTORY 🌈

these functions first appeared in OpenSSL 0.9.3 and have been available since OpenBSD 2.6.

like, they've been iconic for a minute 👑

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<cute>kay that's the whole page! this gem is from the Debian build of the manual, dated June 8, 2025 — and the original header was EVP_PKCS82PKEY(3). slay, go convert some keys 💅🎀🫶</cute>