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[6/6] crypto: x86/chacha - add XChaCha12 support

Message ID 20181128064445.3813-7-ebiggers@kernel.org (mailing list archive)
State Superseded
Delegated to: Herbert Xu
Headers show
Series crypto: x86_64 optimized XChaCha and NHPoly1305 (for Adiantum) | expand

Commit Message

Eric Biggers Nov. 28, 2018, 6:44 a.m. UTC 
From: Eric Biggers <ebiggers@google.com>

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.

Signed-off-by: Eric Biggers <ebiggers@google.com>
---
 arch/x86/crypto/chacha_glue.c | 17 +++++++++++++++++
 crypto/Kconfig                |  4 ++--
 2 files changed, 19 insertions(+), 2 deletions(-)
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Patch

diff --git a/arch/x86/crypto/chacha_glue.c b/arch/x86/crypto/chacha_glue.c
index c643993a29c9f..1aa43cdd5f7cb 100644
--- a/arch/x86/crypto/chacha_glue.c
+++ b/arch/x86/crypto/chacha_glue.c
@@ -186,6 +186,21 @@  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,
 	},
 };
 
@@ -217,3 +232,5 @@  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 ecfc10a3e9f3e..a3ee51a711447 100644
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -1473,8 +1473,8 @@  config CRYPTO_CHACHA20_X86_64
 	select CRYPTO_BLKCIPHER
 	select CRYPTO_CHACHA20
 	help
-	  SSSE3 and AVX2 optimized implementations of the ChaCha20 and XChaCha20
-	  stream ciphers.
+	  SSSE3 and AVX2 optimized implementations of the ChaCha20, XChaCha20,
+	  and XChaCha12 stream ciphers.
 
 config CRYPTO_SEED
 	tristate "SEED cipher algorithm"