global: normalize -> clamp

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

4 files changed, 10 insertions, 17 deletions

diff --git a/src/crypto/zinc/curve25519/curve25519-fiat32.c b/src/crypto/zinc/curve25519/curve25519-fiat32.c
index 60a04e4..7f4f01c 100644
--- a/src/crypto/zinc/curve25519/curve25519-fiat32.c
+++ b/src/crypto/zinc/curve25519/curve25519-fiat32.c
@@ -760,7 +760,7 @@ static void curve25519_generic(u8 out[CURVE25519_KEY_SIZE],
 	u8 e[32];
 
 	memcpy(e, scalar, 32);
-	normalize_secret(e);
+	clamp_secret(e);
 
 	/* The following implementation was transcribed to Coq and proven to
 	 * correspond to unary scalar multiplication in affine coordinates given
diff --git a/src/crypto/zinc/curve25519/curve25519-hacl64.c b/src/crypto/zinc/curve25519/curve25519-hacl64.c
index 9129239..ff22d3b 100644
--- a/src/crypto/zinc/curve25519/curve25519-hacl64.c
+++ b/src/crypto/zinc/curve25519/curve25519-hacl64.c
@@ -767,7 +767,7 @@ static void curve25519_generic(u8 mypublic[CURVE25519_KEY_SIZE],
 		u8 e[32] __aligned(32) = { 0 };
 		u8 *scalar;
 		memcpy(e, secret, 32);
-		normalize_secret(e);
+		clamp_secret(e);
 		scalar = e;
 		{
 			u64 buf[15] = { 0 };
diff --git a/src/crypto/zinc/curve25519/curve25519-x86_64.c b/src/crypto/zinc/curve25519/curve25519-x86_64.c
index 239e345..81ef575 100644
--- a/src/crypto/zinc/curve25519/curve25519-x86_64.c
+++ b/src/crypto/zinc/curve25519/curve25519-x86_64.c
@@ -1935,13 +1935,6 @@ static __always_inline void cselect(u8 bit, u64 *const px, const u64 *const py)
 	);
 }
 
-static __always_inline void clamp_secret(u8 secret[CURVE25519_KEY_SIZE])
-{
-	secret[0] &= 248;
-	secret[31] &= 127;
-	secret[31] |= 64;
-}
-
 static void curve25519_adx(u8 shared[CURVE25519_KEY_SIZE],
 			   const u8 private_key[CURVE25519_KEY_SIZE],
 			   const u8 session_key[CURVE25519_KEY_SIZE])
diff --git a/src/crypto/zinc/curve25519/curve25519.c b/src/crypto/zinc/curve25519/curve25519.c
index f1bfe86..6b3f12a 100644
--- a/src/crypto/zinc/curve25519/curve25519.c
+++ b/src/crypto/zinc/curve25519/curve25519.c
@@ -20,6 +20,13 @@
 #include <linux/init.h>
 #include <crypto/algapi.h> // For crypto_memneq.
 
+static __always_inline void clamp_secret(u8 secret[CURVE25519_KEY_SIZE])
+{
+	secret[0] &= 248;
+	secret[31] &= 127;
+	secret[31] |= 64;
+}
+
 #if defined(CONFIG_ZINC_ARCH_X86_64)
 #include "curve25519-x86_64-glue.c"
 #elif defined(CONFIG_ZINC_ARCH_ARM)
@@ -42,13 +49,6 @@ static inline bool curve25519_base_arch(u8 pub[CURVE25519_KEY_SIZE],
 }
 #endif
 
-static __always_inline void normalize_secret(u8 secret[CURVE25519_KEY_SIZE])
-{
-	secret[0] &= 248;
-	secret[31] &= 127;
-	secret[31] |= 64;
-}
-
 #if defined(CONFIG_ARCH_SUPPORTS_INT128) && defined(__SIZEOF_INT128__)
 #include "curve25519-hacl64.c"
 #else
@@ -84,7 +84,7 @@ EXPORT_SYMBOL(curve25519_generate_public);
 void curve25519_generate_secret(u8 secret[CURVE25519_KEY_SIZE])
 {
 	get_random_bytes_wait(secret, CURVE25519_KEY_SIZE);
-	normalize_secret(secret);
+	clamp_secret(secret);
 }
 EXPORT_SYMBOL(curve25519_generate_secret);