linux-kernel - [PATCH 1/2] crypto: arm/curve25519 - add arch-specific key generation function

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Message-Id: <20191211092640.107621-1-Jason@zx2c4.com>
Date:   Wed, 11 Dec 2019 10:26:39 +0100
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     linux-crypto@...r.kernel.org, herbert@...dor.apana.org.au
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        sfr@...b.auug.org.au, "Jason A. Donenfeld" <Jason@...c4.com>
Subject: [PATCH 1/2] crypto: arm/curve25519 - add arch-specific key generation function

Somehow this was forgotten when Zinc was being split into oddly shaped
pieces, resulting in linker errors. The x86_64 glue has a specific key
generation implementation, but the Arm one does not. However, it can
still receive the NEON speedups by calling the ordinary DH function
using the base point.

Signed-off-by: Jason A. Donenfeld <Jason@...c4.com>
---
 arch/arm/crypto/curve25519-glue.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/arm/crypto/curve25519-glue.c b/arch/arm/crypto/curve25519-glue.c
index f3f42cf3b893..776ae07e0469 100644
--- a/arch/arm/crypto/curve25519-glue.c
+++ b/arch/arm/crypto/curve25519-glue.c
@@ -38,6 +38,13 @@ void curve25519_arch(u8 out[CURVE25519_KEY_SIZE],
 }
 EXPORT_SYMBOL(curve25519_arch);
 
+void curve25519_base_arch(u8 pub[CURVE25519_KEY_SIZE],
+			  const u8 secret[CURVE25519_KEY_SIZE])
+{
+	return curve25519_arch(pub, secret, curve25519_base_point);
+}
+EXPORT_SYMBOL(curve25519_base_arch);
+
 static int curve25519_set_secret(struct crypto_kpp *tfm, const void *buf,
 				 unsigned int len)
 {
-- 
2.24.0