ecc_is_key_valid(9)

💖 ecc_is_key_valid(9) 💖

okay bestie, welcome to the Kernel API Manual page for ecc_is_key_valid — yes it's a section 9 page, yes it's kernel-internal, and yes we're gonna get into it 🎀

---

✨ NAME ✨

ecc_is_key_valid — Validate a given ECDH private key

no like literally that's the whole job, it checks whether your ECDH private key is acceptable, and that's it, that's the function 💅

---

🌸 SYNOPSIS 🌸

int ecc_is_key_valid (unsigned int curve_id , unsigned int ndigits ,
       const u64 *private_key , unsigned int private_key_len );

look at her, four args, one int return, iconic signature ngl 🦋

---

🫶 ARGUMENTS 🫶

• curve_id — id representing the curve to use. it's giving "which curve are we on" energy, you gotta tell it 🌈
• ndigits — curve's number of digits. how many digits the curve has, so the function knows how much to look at ✨
• private_key — private key to be used for the given curve. this is the actual secret, handle with care fr fr 🔥
• private_key_len — private key length. the length of said private key, so she knows how big it is 💅

---

💀 RETURN 💀

0 if the key is acceptable — slay, key ate, we're so back 👑

a negative value otherwise — not slay, key is a no, try again bestie 😭

---

🧚 SEE ALSO 🧚

linked from the Kernel file ./include/crypto/internal/ecc.h, and honestly the whole friend group showed up:

• ecc_swap_digits(9)
• ecc_digits_from_bytes(9)
• ecc_gen_privkey(9)
• ecc_make_pub_key(9)
• crypto_ecdh_shared_secret(9)
• ecc_is_pubkey_valid_partial(9)
• ecc_is_pubkey_valid_full(9)
• vli_is_zero(9)
• vli_cmp(9)
• vli_sub(9)
• vli_from_be64(9)
• vli_from_le64(9)
• vli_mod_inv(9)
• vli_mod_mult_slow(9)
• vli_num_bits(9)
• ecc_alloc_point(9)
• ecc_free_point(9)
• ecc_point_is_zero(9)
• ecc_point_mult_shamir(9)

---

heads up bestie: this is kernel-internal stuff from ./include/crypto/internal — it's not some chill userspace API, so don't go calling it from your lil app okay? 🙈

---

and that's the whole page, no cap 🍓 signing off from the ./include/crypto/internal source, October 2026 version — stay valid, stay iconic, mwah 💖✨