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UPSTREAM: crypto: chacha - move existing library code into lib/crypto

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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as well, in a way that permits the implementation to be superseded by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 <[email protected]>
Signed-off-by: Herbert Xu <[email protected]>
(cherry picked from commit 5fb8ef25803ef33e2eb60b626435828b937bed75)
Bug: 152722841
Signed-off-by: Jason A. Donenfeld <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
Change-Id: I15a2ab1be696f3c37ae6483348c840fdb1d05117
This commit is contained in:
Ard Biesheuvel 2019-11-08 13:22:08 +01:00 • committed by Alexander Martinz
commit 7dfbe55359
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GPG key ID: CF15BDD9A321A9B2
12 changed files with 199 additions and 86 deletions
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crypto/Kconfig
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@ -1434,6 +1434,7 @@ config CRYPTO_SALSA20
config CRYPTO_CHACHA20
tristate "ChaCha stream cipher algorithms"
select CRYPTO_LIB_CHACHA_GENERIC
select CRYPTO_BLKCIPHER
help
The ChaCha20, XChaCha20, and XChaCha12 stream cipher algorithms.