path: root/security/keys/Kconfig
diff options
authorJason A. Donenfeld <>2020-05-11 15:51:01 -0600
committerDavid Howells <>2020-06-02 17:22:31 +0100
commit521fd61c84a19b31dfbaa8dde3d2577e4e115d12 (patch)
tree7b7ab3cf346080b9cb2a1ab022330bed3b7e1f99 /security/keys/Kconfig
parent2ce113fa525faf62fc308a10d1e5af07456b7460 (diff)
security/keys: rewrite big_key crypto to use library interface
A while back, I noticed that the crypto and crypto API usage in big_keys were entirely broken in multiple ways, so I rewrote it. Now, I'm rewriting it again, but this time using the simpler ChaCha20Poly1305 library function. This makes the file considerably more simple; the diffstat alone should justify this commit. It also should be faster, since it no longer requires a mutex around the "aead api object" (nor allocations), allowing us to encrypt multiple items in parallel. We also benefit from being able to pass any type of pointer, so we can get rid of the ridiculously complex custom page allocator that big_key really doesn't need. [DH: Change the select CRYPTO_LIB_CHACHA20POLY1305 to a depends on as select doesn't propagate and the build can end up with an =y dependending on some =m pieces. The depends on CRYPTO also had to be removed otherwise the configurator complains about a recursive dependency.] Cc: Andy Lutomirski <> Cc: Greg KH <> Cc: Linus Torvalds <> Cc: Reviewed-by: Eric Biggers <> Signed-off-by: Jason A. Donenfeld <> Signed-off-by: David Howells <>
Diffstat (limited to 'security/keys/Kconfig')
1 files changed, 1 insertions, 3 deletions
diff --git a/security/keys/Kconfig b/security/keys/Kconfig
index 47c041563d41..8153ea01d7bb 100644
--- a/security/keys/Kconfig
+++ b/security/keys/Kconfig
@@ -60,9 +60,7 @@ config BIG_KEYS
bool "Large payload keys"
depends on KEYS
depends on TMPFS
- select CRYPTO
- select CRYPTO_AES
- select CRYPTO_GCM
+ depends on CRYPTO_LIB_CHACHA20POLY1305 = y
This option provides support for holding large keys within the kernel
(for example Kerberos ticket caches). The data may be stored out to