ecryptfs_co...ipher_string(9)

👑 ecryptfs_co...ipher_string(9) 👑

okay so bestie, we're in the Kernel API Manual today and this one is a tiny little function that does one extremely specific thing and honestly? it ate. it's giving "i have one job and i do it." let's get into it 💅

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✨ NAME ✨

ecryptfs_code_for_cipher_string — that's the whole name section, no cap. the manpage just drops the function name and dips 🙈 (the description got left on read, fr fr).

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✨ SYNOPSIS ✨

u8 ecryptfs_code_for_cipher_string (char *cipher_name , size_t key_bytes
);

so it hands you back a u8 — a whole little byte of an answer — and it wants two things from you: a char *cipher_name and a size_t key_bytes. that's the vibe check. 🦋

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✨ ARGUMENTS ✨

• cipher_name — the string alias for the cipher 🎀 like, the cute nickname your cipher goes by.
• key_bytes — length of key in bytes; used for AES code selection 🔥 so yeah, the key length actually matters here — it's not just decoration, it's how the AES code gets picked. main character parameter energy.

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✨ DESCRIPTION ✨

Returns zero on no match, or the cipher code on match 💖

that's it. that's the whole function. it looks at your cipher string, and either it's like "nope, zero" or it's like "yes bestie, here's your code ✨." no in-between, no drama. periodt.

lowkey important: zero means no match, not "cipher code zero" — don't get it twisted 🙈

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✨ SEE ALSO ✨

Kernel file ./fs/ecryptfs/crypto.c — that's where the magic lives, go read it iykyk 💜

and here's the whole friend group, literally the entire guest list:

• ecryptfs_from_hex(9)
• ecryptfs_derive_iv(9)
• ecryptfs_init_crypt_stat(9)
• ecryptfs_destroy_crypt_stat(9)
• virt_to_scatterlist(9)
• crypt_scatterlist(9)
• crypt_extent(9)
• ecryptfs_encrypt_page(9)
• ecryptfs_decrypt_page(9)
• ecryptfs_init_crypt_ctx(9)
• ecryptfs_copy_mount_wide_flags_to_inode_flags(9)
• ecryptfs_set_default_crypt_stat_vals(9)
• ecryptfs_new_file_context(9)
• ecryptfs_validate_marker(9)
• ecryptfs_process_flags(9)
• write_ecryptfs_marker(9)
• ecryptfs_cipher_code_to_string(9)
• ecryptfs_write_headers_virt(9)
• ecryptfs_write_metadata(9)
• set_default_header_data(9)
• ecryptfs_read_headers_virt(9)
• ecryptfs_read_xattr_region(9)
• ecryptfs_process_key_cipher(9)
• ecryptfs_destroy_crypto(9)
• ecryptfs_tfm_exists(9)
• ecryptfs_get_tfm_and_mutex_for_cipher_name(9)
• ecryptfs_encode_for_filename(9)
• ecryptfs_decode_from_filename(9)
• ecryptfs_encrypt_and_encode_filename(9)
• ecryptfs_decode_and_decrypt_filename(9)

like, that's THIRTY entries, we're not beating the "ecryptfs is a big family" allegations 😭🫶

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and that's the whole page babes 💖 brought to you by the fine folks over at ./fs/ecryptfs, stamped October 2026 — mwah, see you in the next manpage, slay 🌈⭐🎀