linux-kernel - [PATCH 4/6] lib/crypto: curve25519: Move a couple functions out-of-line

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Message-ID: <20250901201815.594177-5-ebiggers@kernel.org>
Date: Mon,  1 Sep 2025 13:18:13 -0700
From: Eric Biggers <ebiggers@...nel.org>
To: linux-crypto@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	Ard Biesheuvel <ardb@...nel.org>,
	"Jason A . Donenfeld" <Jason@...c4.com>,
	Zhiqi Song <songzhiqi1@...wei.com>,
	Longfang Liu <liulongfang@...wei.com>,
	x86@...nel.org,
	linux-arm-kernel@...ts.infradead.org,
	linuxppc-dev@...ts.ozlabs.org,
	Eric Biggers <ebiggers@...nel.org>
Subject: [PATCH 4/6] lib/crypto: curve25519: Move a couple functions out-of-line

Move curve25519() and curve25519_generate_public() from curve25519.h to
curve25519.c.  There's no good reason for them to be inline.

Signed-off-by: Eric Biggers <ebiggers@...nel.org>
---
 include/crypto/curve25519.h | 28 +++-------------------------
 lib/crypto/curve25519.c     | 34 +++++++++++++++++++++++++++++++++-
 2 files changed, 36 insertions(+), 26 deletions(-)

diff --git a/include/crypto/curve25519.h b/include/crypto/curve25519.h
index 4e6dc840b1592..78aa5f28c847f 100644
--- a/include/crypto/curve25519.h
+++ b/include/crypto/curve25519.h
@@ -4,11 +4,10 @@
  */
 
 #ifndef CURVE25519_H
 #define CURVE25519_H
 
-#include <crypto/algapi.h> // For crypto_memneq.
 #include <linux/types.h>
 #include <linux/random.h>
 
 enum curve25519_lengths {
 	CURVE25519_KEY_SIZE = 32
@@ -26,37 +25,16 @@ void curve25519_arch(u8 out[CURVE25519_KEY_SIZE],
 		     const u8 point[CURVE25519_KEY_SIZE]);
 
 void curve25519_base_arch(u8 pub[CURVE25519_KEY_SIZE],
 			  const u8 secret[CURVE25519_KEY_SIZE]);
 
-static inline
 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))
-		curve25519_arch(mypublic, secret, basepoint);
-	else
-		curve25519_generic(mypublic, secret, basepoint);
-	return crypto_memneq(mypublic, curve25519_null_point,
-			     CURVE25519_KEY_SIZE);
-}
+			     const u8 basepoint[CURVE25519_KEY_SIZE]);
 
-static inline bool
-__must_check curve25519_generate_public(u8 pub[CURVE25519_KEY_SIZE],
-					const u8 secret[CURVE25519_KEY_SIZE])
-{
-	if (unlikely(!crypto_memneq(secret, curve25519_null_point,
-				    CURVE25519_KEY_SIZE)))
-		return false;
-
-	if (IS_ENABLED(CONFIG_CRYPTO_ARCH_HAVE_LIB_CURVE25519))
-		curve25519_base_arch(pub, secret);
-	else
-		curve25519_generic(pub, secret, curve25519_base_point);
-	return crypto_memneq(pub, curve25519_null_point, CURVE25519_KEY_SIZE);
-}
+bool __must_check curve25519_generate_public(u8 pub[CURVE25519_KEY_SIZE],
+					     const u8 secret[CURVE25519_KEY_SIZE]);
 
 static inline void curve25519_clamp_secret(u8 secret[CURVE25519_KEY_SIZE])
 {
 	secret[0] &= 248;
 	secret[31] = (secret[31] & 127) | 64;
diff --git a/lib/crypto/curve25519.c b/lib/crypto/curve25519.c
index 25f16777865bf..1b786389d714a 100644
--- a/lib/crypto/curve25519.c
+++ b/lib/crypto/curve25519.c
@@ -8,12 +8,44 @@
  *
  * Information: https://cr.yp.to/ecdh.html
  */
 
 #include <crypto/curve25519.h>
-#include <linux/module.h>
+#include <crypto/utils.h>
+#include <linux/export.h>
 #include <linux/init.h>
+#include <linux/module.h>
+
+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))
+		curve25519_arch(mypublic, secret, basepoint);
+	else
+		curve25519_generic(mypublic, secret, basepoint);
+	return crypto_memneq(mypublic, curve25519_null_point,
+			     CURVE25519_KEY_SIZE);
+}
+EXPORT_SYMBOL(curve25519);
+
+bool __must_check
+curve25519_generate_public(u8 pub[CURVE25519_KEY_SIZE],
+			   const u8 secret[CURVE25519_KEY_SIZE])
+{
+	if (unlikely(!crypto_memneq(secret, curve25519_null_point,
+				    CURVE25519_KEY_SIZE)))
+		return false;
+
+	if (IS_ENABLED(CONFIG_CRYPTO_ARCH_HAVE_LIB_CURVE25519))
+		curve25519_base_arch(pub, secret);
+	else
+		curve25519_generic(pub, secret, curve25519_base_point);
+	return crypto_memneq(pub, curve25519_null_point, CURVE25519_KEY_SIZE);
+}
+EXPORT_SYMBOL(curve25519_generate_public);
 
 static int __init curve25519_init(void)
 {
 	return 0;
 }
-- 
2.50.1