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Diffstat (limited to 'lib/crypto/arm/curve25519.h')
| -rw-r--r-- | lib/crypto/arm/curve25519.h | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/lib/crypto/arm/curve25519.h b/lib/crypto/arm/curve25519.h new file mode 100644 index 000000000000..f6d66494eb8f --- /dev/null +++ b/lib/crypto/arm/curve25519.h @@ -0,0 +1,47 @@ +// SPDX-License-Identifier: GPL-2.0 OR MIT +/* + * Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved. + * + * Based on public domain code from Daniel J. Bernstein and Peter Schwabe. This + * began from SUPERCOP's curve25519/neon2/scalarmult.s, but has subsequently been + * manually reworked for use in kernel space. + */ + +#include <asm/hwcap.h> +#include <asm/neon.h> +#include <asm/simd.h> +#include <crypto/internal/simd.h> +#include <linux/types.h> +#include <linux/jump_label.h> + +asmlinkage void curve25519_neon(u8 mypublic[CURVE25519_KEY_SIZE], + const u8 secret[CURVE25519_KEY_SIZE], + const u8 basepoint[CURVE25519_KEY_SIZE]); + +static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_neon); + +static void curve25519_arch(u8 out[CURVE25519_KEY_SIZE], + const u8 scalar[CURVE25519_KEY_SIZE], + const u8 point[CURVE25519_KEY_SIZE]) +{ + if (static_branch_likely(&have_neon) && crypto_simd_usable()) { + kernel_neon_begin(); + curve25519_neon(out, scalar, point); + kernel_neon_end(); + } else { + curve25519_generic(out, scalar, point); + } +} + +static void curve25519_base_arch(u8 pub[CURVE25519_KEY_SIZE], + const u8 secret[CURVE25519_KEY_SIZE]) +{ + curve25519_arch(pub, secret, curve25519_base_point); +} + +#define curve25519_mod_init_arch curve25519_mod_init_arch +static void curve25519_mod_init_arch(void) +{ + if (elf_hwcap & HWCAP_NEON) + static_branch_enable(&have_neon); +} |