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/* SPDX-License-Identifier: GPL-2.0
*
* Copyright (C) 2015-2018 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
*/
#include "curve25519.h"
#include <linux/version.h>
#include <linux/string.h>
#include <linux/random.h>
#include <crypto/algapi.h>
static __always_inline void normalize_secret(u8 secret[CURVE25519_POINT_SIZE])
{
secret[0] &= 248;
secret[31] &= 127;
secret[31] |= 64;
}
#if defined(CONFIG_X86_64)
#include "curve25519-x86_64.h"
#elif IS_ENABLED(CONFIG_KERNEL_MODE_NEON) && defined(CONFIG_ARM)
#include "curve25519-arm.h"
#else
void __init curve25519_fpu_init(void) { }
#endif
#if defined(CONFIG_ARCH_SUPPORTS_INT128) && defined(__SIZEOF_INT128__)
#include "curve25519-hacl64.h"
#else
#include "curve25519-fiat32.h"
#endif
static const u8 null_point[CURVE25519_POINT_SIZE] = { 0 };
bool curve25519(u8 mypublic[CURVE25519_POINT_SIZE], const u8 secret[CURVE25519_POINT_SIZE], const u8 basepoint[CURVE25519_POINT_SIZE])
{
#if defined(CONFIG_X86_64)
if (curve25519_use_adx)
curve25519_adx(mypublic, secret, basepoint);
else if (curve25519_use_bmi2)
curve25519_bmi2(mypublic, secret, basepoint);
else
#elif IS_ENABLED(CONFIG_KERNEL_MODE_NEON) && defined(CONFIG_ARM)
if (curve25519_use_neon && may_use_simd()) {
kernel_neon_begin();
curve25519_neon(mypublic, secret, basepoint);
kernel_neon_end();
} else
#endif
curve25519_generic(mypublic, secret, basepoint);
return crypto_memneq(mypublic, null_point, CURVE25519_POINT_SIZE);
}
bool curve25519_generate_public(u8 pub[CURVE25519_POINT_SIZE], const u8 secret[CURVE25519_POINT_SIZE])
{
static const u8 basepoint[CURVE25519_POINT_SIZE] __aligned(32) = { 9 };
if (unlikely(!crypto_memneq(secret, null_point, CURVE25519_POINT_SIZE)))
return false;
#if defined(CONFIG_X86_64)
if (curve25519_use_adx) {
curve25519_adx_base(pub, secret);
return crypto_memneq(pub, null_point, CURVE25519_POINT_SIZE);
}
if (curve25519_use_bmi2) {
curve25519_bmi2_base(pub, secret);
return crypto_memneq(pub, null_point, CURVE25519_POINT_SIZE);
}
#endif
return curve25519(pub, secret, basepoint);
}
void curve25519_generate_secret(u8 secret[CURVE25519_POINT_SIZE])
{
get_random_bytes_wait(secret, CURVE25519_POINT_SIZE);
normalize_secret(secret);
}
#include "../selftest/curve25519.h"
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