95 lines
2.3 KiB
C
95 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2018-2020 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
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*/
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#include "curve25519.h"
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#include <stdint.h>
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#include <string.h>
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#ifndef __BYTE_ORDER__
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#include <sys/param.h>
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#if !defined(BYTE_ORDER) || !defined(BIG_ENDIAN) || !defined(LITTLE_ENDIAN)
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#error "Unable to determine endianness."
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#endif
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#define __BYTE_ORDER__ BYTE_ORDER
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#define __ORDER_BIG_ENDIAN__ BIG_ENDIAN
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#define __ORDER_LITTLE_ENDIAN__ LITTLE_ENDIAN
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#endif
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#ifdef __linux__
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#include <linux/types.h>
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typedef __u64 u64;
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typedef __u32 u32;
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typedef __u8 u8;
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typedef __s64 s64;
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#else
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typedef uint64_t u64, __le64;
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typedef uint32_t u32, __le32;
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typedef uint8_t u8;
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typedef int64_t s64;
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#endif
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#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
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#define le64_to_cpup(a) __builtin_bswap64(*(a))
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#define le32_to_cpup(a) __builtin_bswap32(*(a))
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#define cpu_to_le64(a) __builtin_bswap64(a)
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#else
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#define le64_to_cpup(a) (*(a))
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#define le32_to_cpup(a) (*(a))
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#define cpu_to_le64(a) (a)
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#endif
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static inline __le32 get_unaligned_le32(const u8 *a)
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{
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__le32 l;
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__builtin_memcpy(&l, a, sizeof(l));
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return le32_to_cpup(&l);
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}
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static inline __le64 get_unaligned_le64(const u8 *a)
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{
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__le64 l;
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__builtin_memcpy(&l, a, sizeof(l));
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return le64_to_cpup(&l);
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}
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static inline void put_unaligned_le64(u64 s, u8 *d)
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{
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__le64 l = cpu_to_le64(s);
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__builtin_memcpy(d, &l, sizeof(l));
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}
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#ifndef __always_inline
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#define __always_inline __inline __attribute__((__always_inline__))
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#endif
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#ifndef noinline
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#define noinline __attribute__((noinline))
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#endif
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#ifndef __aligned
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#define __aligned(x) __attribute__((aligned(x)))
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#endif
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#ifndef __force
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#define __force
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#endif
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static noinline void memzero_explicit(void *s, size_t count)
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{
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memset(s, 0, count);
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asm volatile("": :"r"(s) : "memory");
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}
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#ifdef __SIZEOF_INT128__
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#include "curve25519-hacl64.h"
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#else
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#include "curve25519-fiat32.h"
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#endif
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void curve25519_generate_public(uint8_t pub[static CURVE25519_KEY_SIZE], const uint8_t secret[static CURVE25519_KEY_SIZE])
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{
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static const uint8_t basepoint[CURVE25519_KEY_SIZE] __aligned(sizeof(uintptr_t)) = { 9 };
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curve25519(pub, secret, basepoint);
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}
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void curve25519(uint8_t mypublic[static CURVE25519_KEY_SIZE], const uint8_t secret[static CURVE25519_KEY_SIZE], const uint8_t basepoint[static CURVE25519_KEY_SIZE])
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{
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curve25519_generic(mypublic, secret, basepoint);
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}
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