[PATCH v3 5/6] crypto: x86/chacha - add XChaCha12 support
From: Eric Biggers <ebiggers@kernel.org>
Date: 2018-12-05 06:21:55
Also in:
lkml
Subsystem:
crypto api, the rest, x86 architecture (32-bit and 64-bit) · Maintainers:
Herbert Xu, "David S. Miller", Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen
From: Eric Biggers <redacted> 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 <redacted> Signed-off-by: Eric Biggers <redacted> --- arch/x86/crypto/chacha_glue.c | 17 +++++++++++++++++ crypto/Kconfig | 4 ++-- 2 files changed, 19 insertions(+), 2 deletions(-)
diff --git a/arch/x86/crypto/chacha_glue.c b/arch/x86/crypto/chacha_glue.c
index 35fd02b50d27..d19c2908be90 100644
--- a/arch/x86/crypto/chacha_glue.c
+++ b/arch/x86/crypto/chacha_glue.c@@ -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");
diff --git a/crypto/Kconfig b/crypto/Kconfig
index df466771e9bf..29865c599b04 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig@@ -1473,8 +1473,8 @@ 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"
--
2.19.2