fcrypt_pcbc_decrypt(9)

💜 fcrypt_pcbc_decrypt(9) 💜

okay so bestie, welcome to fcrypt_pcbc_decrypt(9) — it's a page straight out of the Kernel API Manual, and it's literally about undoing the FCrypt cipher's PCBC-mode encryption. yes, the un-fun direction. we're taking scrambled blocks and handing you back your data. slay 🫶

---

✨ NAME ✨

fcrypt_pcbc_decrypt — Decrypt data using FCrypt cipher in PCBC mode

like, that's the whole gig. decrypt. FCrypt. PCBC mode. no cap 💅

---

🌸 SYNOPSIS 🌸

void fcrypt_pcbc_decrypt (const struct fcrypt_key *key , const u8
iv[FCRYPT_BSIZE] , const void *src , void *dst , size_t nblocks );

look at that signature, it's giving main character energy ⭐

---

🦋 ARGUMENTS 🦋

• key — The key 🔑 like, the actual key you're decrypting with. it's a const struct fcrypt_key *, so nobody's touching it, it's just vibing there being a key.
• iv — The 8-byte initialization vector 🎀 fr fr, it's const u8 iv[FCRYPT_BSIZE], and FCRYPT_BSIZE is the 8-byte situation. you need it, don't lose it.
• src — The source data 📥 the ciphertext lives here. const void *, so we're reading only, hands off.
• dst — The destination data 💌 Both in-place and out-of-place are supported. so you can decrypt right back into the same buffer (src == dst, go off) or into a whole separate one. iconic flexibility, we love to see it.
• nblocks — The number of 8-byte blocks to decrypt 🔢 not bytes, babes, blocks. 8-byte blocks. that distinction is gonna matter, iykyk.

---

🌈 SEE ALSO 🌈

• Kernel file ./net/rxrpc/fcrypt.c 🗂️
• fcrypt_preparekey(9) — get your key ready first, bestie
• fcrypt_pcbc_encrypt(9) — the other direction, the one where you hide the data 💀

---

lowkey a reminder: this is decrypt, so fcrypt_pcbc_encrypt(9) is your sibling page — if you're going the other way, that's where you wanna be 🙈

---

and that's the page! 🧚 it came to us from ./net/rxrpc, dated October 2026, under the Kernel API Manual banner — stay encrypted out there, bestie 💖🍓