diff options
| author |   Ard Biesheuvel <ardb@kernel.org> | 2019-11-08 13:22:08 +0100 |
|---|---|---|
| committer |   Herbert Xu <herbert@gondor.apana.org.au> | 2019-11-17 09:02:39 +0800 |
| commit | 5fb8ef25803ef33e2eb60b626435828b937bed75 (patch) | |
| tree | 156401ad072c1acc18f74cbdf8eb31859191b9ac /lib/crypto/Kconfig | |
| parent | crypto: lib - tidy up lib/crypto Kconfig and Makefile (diff) | |
| download | linux-dev-5fb8ef25803ef33e2eb60b626435828b937bed75.tar.xz linux-dev-5fb8ef25803ef33e2eb60b626435828b937bed75.zip | |
crypto: chacha - move existing library code into lib/crypto
Currently, our generic ChaCha implementation consists of a permute
function in lib/chacha.c that operates on the 64-byte ChaCha state
directly [and which is always included into the core kernel since it
is used by the /dev/random driver], and the crypto API plumbing to
expose it as a skcipher.
In order to support in-kernel users that need the ChaCha streamcipher
but have no need [or tolerance] for going through the abstractions of
the crypto API, let's expose the streamcipher bits via a library API
as well, in a way that permits the implementation to be superseded by
an architecture specific one if provided.
So move the streamcipher code into a separate module in lib/crypto,
and expose the init() and crypt() routines to users of the library.
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'lib/crypto/Kconfig')
| -rw-r--r-- | lib/crypto/Kconfig | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/lib/crypto/Kconfig b/lib/crypto/Kconfig index 261430051595..6a11931ae105 100644 --- a/lib/crypto/Kconfig +++ b/lib/crypto/Kconfig @@ -8,6 +8,32 @@ config CRYPTO_LIB_AES config CRYPTO_LIB_ARC4 tristate +config CRYPTO_ARCH_HAVE_LIB_CHACHA + tristate + help + Declares whether the architecture provides an arch-specific + accelerated implementation of the ChaCha library interface, + either builtin or as a module. + +config CRYPTO_LIB_CHACHA_GENERIC + tristate + select CRYPTO_ALGAPI + help + This symbol can be depended upon by arch implementations of the + ChaCha library interface that require the generic code as a + fallback, e.g., for SIMD implementations. If no arch specific + implementation is enabled, this implementation serves the users + of CRYPTO_LIB_CHACHA. + +config CRYPTO_LIB_CHACHA + tristate "ChaCha library interface" + depends on CRYPTO_ARCH_HAVE_LIB_CHACHA || !CRYPTO_ARCH_HAVE_LIB_CHACHA + select CRYPTO_LIB_CHACHA_GENERIC if CRYPTO_ARCH_HAVE_LIB_CHACHA=n + help + Enable the ChaCha library interface. This interface may be fulfilled + by either the generic implementation or an arch-specific one, if one + is available and enabled. + config CRYPTO_LIB_DES tristate |