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fscrypt only uses SHA-256 for AES-128-CBC-ESSIV, which isn't the default and is only recommended on platforms that have hardware accelerated AES-CBC but not AES-XTS. There's no link-time dependency, since SHA-256 is requested via the crypto API on first use. To reduce bloat, we should limit FS_ENCRYPTION to selecting the default algorithms only. SHA-256 by itself isn't that much bloat, but it's being discussed to move ESSIV into a crypto API template, which would incidentally bring in other things like "authenc" support, which would all end up being built-in since FS_ENCRYPTION is now a bool. For Adiantum encryption we already just document that users who want to use it have to enable CONFIG_CRYPTO_ADIANTUM themselves. So, let's do the same for AES-128-CBC-ESSIV and CONFIG_CRYPTO_SHA256. Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Reviewed-by: Theodore Ts'o <tytso@mit.edu> Signed-off-by: Eric Biggers <ebiggers@google.com> |
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| .. | ||
| bio.c | ||
| crypto.c | ||
| fname.c | ||
| fscrypt_private.h | ||
| hooks.c | ||
| Kconfig | ||
| keyinfo.c | ||
| Makefile | ||
| policy.c | ||