[+Cc linux-fscrypt] On Mon, Mar 20, 2023 at 06:49:29PM +0800, Xiubo Li wrote: > Hi Eric, > > BTW, I am planing to support the fscrypt in userspace ceph client. Is there > any userland implementation of fscrypt ? If no then what should I use > instead ? > I assume that you mean userspace code that encrypts files the same way the kernel does? There's some code in xfstests that reproduces all the fscrypt encryption for testing purposes (https://git.kernel.org/pub/scm/fs/xfs/xfstests-dev.git/tree/src/fscrypt-crypt-util.c?h=for-next). It does *not* use production-quality implementations of the algorithms, though. It just has minimal implementations for testing without depending on OpenSSL. Similar testing code can also be found in Android's vts_kernel_encryption_test (https://android.googlesource.com/platform/test/vts-testcase/kernel/+/refs/heads/master/encryption). It uses BoringSSL for the algorithms when possible, but unlike the xfstest it does not test filenames encryption. There's also some code in mkfs.ubifs in mtd-utils (http://git.infradead.org/mtd-utils.git) that supports creating encrypted files. However, it's outdated since it only supports policy version 1. Which algorithms do you need to support? The HKDF-SHA512 + AES-256-XTS + AES-256-CTS combo shouldn't be hard to support if your program can depend on OpenSSL (1.1.0 or later). - Eric
|