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UPSTREAM: crypto: x86/chacha - add XChaCha12 support

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Now that the x86_64 SIMD implementations of ChaCha20 and XChaCha20 have
been refactored to support varying the number of rounds, add support for
XChaCha12.  This is identical to XChaCha20 except for the number of
rounds, which is 12 instead of 20.  This can be used by Adiantum.

Reviewed-by: Martin Willi <martin@strongswan.org>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
(cherry picked from commit 7a507d62258afd514583fadf1482451079fa0e4d)
Bug: 152722841
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: Ic146122b11b8bf5a0962a914aa8c8f631f3d047a
This commit is contained in:
Eric Biggers 2018-12-04 22:20:04 -08:00 committed by Greg Kroah-Hartman
parent 3fdd3e79ce
commit c4d866c3ae
2 changed files with 19 additions and 2 deletions
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17
arch/x86/crypto/chacha_glue.c
View file

@ -232,6 +232,21 @@ static struct skcipher_alg algs[] = {
.setkey = crypto_chacha20_setkey,
.encrypt = xchacha_simd,
.decrypt = xchacha_simd,
}, {
.base.cra_name = "xchacha12",
.base.cra_driver_name = "xchacha12-simd",
.base.cra_priority = 300,
.base.cra_blocksize = 1,
.base.cra_ctxsize = sizeof(struct chacha_ctx),
.base.cra_module = THIS_MODULE,
.min_keysize = CHACHA_KEY_SIZE,
.max_keysize = CHACHA_KEY_SIZE,
.ivsize = XCHACHA_IV_SIZE,
.chunksize = CHACHA_BLOCK_SIZE,
.setkey = crypto_chacha12_setkey,
.encrypt = xchacha_simd,
.decrypt = xchacha_simd,
},
};
@ -268,3 +283,5 @@ MODULE_ALIAS_CRYPTO("chacha20");
MODULE_ALIAS_CRYPTO("chacha20-simd");
MODULE_ALIAS_CRYPTO("xchacha20");
MODULE_ALIAS_CRYPTO("xchacha20-simd");
MODULE_ALIAS_CRYPTO("xchacha12");
MODULE_ALIAS_CRYPTO("xchacha12-simd");

4
crypto/Kconfig
View file

@ -1492,8 +1492,8 @@ config CRYPTO_CHACHA20_X86_64
select CRYPTO_BLKCIPHER
select CRYPTO_CHACHA20
help
SSSE3, AVX2, and AVX-512VL optimized implementations of the ChaCha20
and XChaCha20 stream ciphers.
SSSE3, AVX2, and AVX-512VL optimized implementations of the ChaCha20,
XChaCha20, and XChaCha12 stream ciphers.
config CRYPTO_SEED
tristate "SEED cipher algorithm"