Messages in this thread | | | From | Richard Weinberger <> | Subject | fscrypt: in-place decrypt vs. out-of-place encrypt? | Date | Thu, 22 Sep 2016 10:49:41 +0200 |
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Hi!
While reading the fscrypt code I noticed that some functions use the bounce pages and some not. fscrypt_decrypt_page() and fscrypt_decrypt_bio_pages() work in-place while fscrypt_encrypt_page() and fscrypt_zeroout_range() use a bounce page.
So, both ext4 and f2fs encrypt data using an extra buffer but decrypt mostly in-place without the need of an extra buffer. Why that? I'd assume when decryption can be done in-place also encryption is possible that way.
I'm working on fscrypt for UBIFS and would like to avoid an extra buffer since memory is low on embedded systems.
Thanks, //richard
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