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authorJason A. Donenfeld <Jason@zx2c4.com>2020-03-01 17:52:35 +0300
committerHerbert Xu <herbert@gondor.apana.org.au>2020-03-05 10:28:09 +0300
commit1579f1bc3b753d17a44de3457d5c6f4a5b14c752 (patch)
treefbec2103aa55f71c32035e1e0cfdf530d8939059 /include/crypto/curve25519.h
parentc9cc0517bba9f0213f1e55172feceb99e5512daf (diff)
downloadlinux-1579f1bc3b753d17a44de3457d5c6f4a5b14c752.tar.xz
crypto: x86/curve25519 - support assemblers with no adx support
Some older version of GAS do not support the ADX instructions, similarly to how they also don't support AVX and such. This commit adds the same build-time detection mechanisms we use for AVX and others for ADX, and then makes sure that the curve25519 library dispatcher calls the right functions. Reported-by: Willy Tarreau <w@1wt.eu> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'include/crypto/curve25519.h')
-rw-r--r--include/crypto/curve25519.h6
1 files changed, 4 insertions, 2 deletions
diff --git a/include/crypto/curve25519.h b/include/crypto/curve25519.h
index 4e6dc840b159..9ecb3c1f0f15 100644
--- a/include/crypto/curve25519.h
+++ b/include/crypto/curve25519.h
@@ -33,7 +33,8 @@ bool __must_check curve25519(u8 mypublic[CURVE25519_KEY_SIZE],
const u8 secret[CURVE25519_KEY_SIZE],
const u8 basepoint[CURVE25519_KEY_SIZE])
{
- if (IS_ENABLED(CONFIG_CRYPTO_ARCH_HAVE_LIB_CURVE25519))
+ if (IS_ENABLED(CONFIG_CRYPTO_ARCH_HAVE_LIB_CURVE25519) &&
+ (!IS_ENABLED(CONFIG_CRYPTO_CURVE25519_X86) || IS_ENABLED(CONFIG_AS_ADX)))
curve25519_arch(mypublic, secret, basepoint);
else
curve25519_generic(mypublic, secret, basepoint);
@@ -49,7 +50,8 @@ __must_check curve25519_generate_public(u8 pub[CURVE25519_KEY_SIZE],
CURVE25519_KEY_SIZE)))
return false;
- if (IS_ENABLED(CONFIG_CRYPTO_ARCH_HAVE_LIB_CURVE25519))
+ if (IS_ENABLED(CONFIG_CRYPTO_ARCH_HAVE_LIB_CURVE25519) &&
+ (!IS_ENABLED(CONFIG_CRYPTO_CURVE25519_X86) || IS_ENABLED(CONFIG_AS_ADX)))
curve25519_base_arch(pub, secret);
else
curve25519_generic(pub, secret, curve25519_base_point);