target/linux/generic/backport-5.4/080-wireguard-0039-crypto-arm-curve25519-add-arch-specific-key-generati.patch

   1 From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
   2 From: "Jason A. Donenfeld" <Jason@zx2c4.com>
   3 Date: Wed, 11 Dec 2019 10:26:39 +0100
   4 Subject: [PATCH] crypto: arm/curve25519 - add arch-specific key generation
   5  function
   6
   7 commit 84faa307249b341f6ad8de3e1869d77a65e26669 upstream.
   8
   9 Somehow this was forgotten when Zinc was being split into oddly shaped
  10 pieces, resulting in linker errors. The x86_64 glue has a specific key
  11 generation implementation, but the Arm one does not. However, it can
  12 still receive the NEON speedups by calling the ordinary DH function
  13 using the base point.
  14
  15 Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
  16 Acked-by: Ard Biesheuvel <ardb@kernel.org>
  17 Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
  18 Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
  19 ---
  20  arch/arm/crypto/curve25519-glue.c | 7 +++++++
  21  1 file changed, 7 insertions(+)
  22
  23 --- a/arch/arm/crypto/curve25519-glue.c
  24 +++ b/arch/arm/crypto/curve25519-glue.c
  25 @@ -38,6 +38,13 @@ void curve25519_arch(u8 out[CURVE25519_K
  26  }
  27  EXPORT_SYMBOL(curve25519_arch);
  28
  29 +void curve25519_base_arch(u8 pub[CURVE25519_KEY_SIZE],
  30 +                         const u8 secret[CURVE25519_KEY_SIZE])
  31 +{
  32 +       return curve25519_arch(pub, secret, curve25519_base_point);
  33 +}
  34 +EXPORT_SYMBOL(curve25519_base_arch);
  35 +
  36  static int curve25519_set_secret(struct crypto_kpp *tfm, const void *buf,
  37                                  unsigned int len)
  38  {