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authorEric Biggers <ebiggers@google.com>2018-12-05 09:20:04 +0300
committerHerbert Xu <herbert@gondor.apana.org.au>2018-12-13 13:24:58 +0300
commit7a507d62258afd514583fadf1482451079fa0e4d (patch)
treebff7778a6fcb50dc9f8030fe7710f011ce857ff2
parent8b65f34c5821e7361488dc668d21195ea4c9f14d (diff)
downloadlinux-7a507d62258afd514583fadf1482451079fa0e4d.tar.xz
crypto: x86/chacha - add XChaCha12 support
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>
-rw-r--r--arch/x86/crypto/chacha_glue.c17
-rw-r--r--crypto/Kconfig4
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 dc3a0e3ea2ac..045af6eeb7e2 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"