2aa92dfe28
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API, let's expose the streamcipher bits via a library API as well, in a way that permits the implementation to be superseded by an architecture specific one if provided.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> (cherry picked from commit 5fb8ef25803ef33e2eb60b626435828b937bed75) Bug: 152722841 Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> Signed-off-by: Greg Kroah-Hartman <gregkh@google.com> Change-Id: I7fe321d1fcbaea1dc3f9f65dec74a6f40da2d489
30 lines
1022 B
Plaintext
30 lines
1022 B
Plaintext
# SPDX-License-Identifier: GPL-2.0
|
|
|
|
comment "Crypto library routines"
|
|
|
|
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.
|