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/* $OpenBSD: crypto_internal.h,v 1.14 2024/11/08 14:05:43 jsing Exp $ */
/*
* Copyright (c) 2023 Joel Sing <jsing@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <endian.h>
#include <stddef.h>
#include <stdint.h>
#include <string.h>
#include "crypto_arch.h"
#ifndef HEADER_CRYPTO_INTERNAL_H
#define HEADER_CRYPTO_INTERNAL_H
#define CTASSERT(x) \
extern char _ctassert[(x) ? 1 : -1] __attribute__((__unused__))
/*
* Constant time functions for size_t.
*/
#ifndef HAVE_CRYPTO_CT_NE_ZERO
static inline int
crypto_ct_ne_zero(size_t v)
{
return (v | ~(v - 1)) >> ((sizeof(v) * 8) - 1);
}
#endif
#ifndef HAVE_CRYPTO_CT_NE_ZERO_MASK
static inline size_t
crypto_ct_ne_zero_mask(size_t v)
{
return 0 - crypto_ct_ne_zero(v);
}
#endif
#ifndef HAVE_CRYPTO_CT_EQ_ZERO
static inline int
crypto_ct_eq_zero(size_t v)
{
return 1 - crypto_ct_ne_zero(v);
}
#endif
#ifndef HAVE_CRYPTO_CT_EQ_ZERO_MASK_U8
static inline size_t
crypto_ct_eq_zero_mask(size_t v)
{
return 0 - crypto_ct_eq_zero(v);
}
#endif
#ifndef HAVE_CRYPTO_CT_LT
static inline int
crypto_ct_lt(size_t a, size_t b)
{
return (((a - b) | (b & ~a)) & (b | ~a)) >>
(sizeof(size_t) * 8 - 1);
}
#endif
#ifndef HAVE_CRYPTO_CT_LT_MASK
static inline size_t
crypto_ct_lt_mask(size_t a, size_t b)
{
return 0 - crypto_ct_lt(a, b);
}
#endif
#ifndef HAVE_CRYPTO_CT_GT
static inline int
crypto_ct_gt(size_t a, size_t b)
{
return crypto_ct_lt(b, a);
}
#endif
#ifndef HAVE_CRYPTO_CT_GT_MASK
static inline size_t
crypto_ct_gt_mask(size_t a, size_t b)
{
return 0 - crypto_ct_gt(a, b);
}
#endif
/*
* Constant time operations for uint8_t.
*/
#ifndef HAVE_CRYPTO_CT_NE_ZERO_U8
static inline int
crypto_ct_ne_zero_u8(uint8_t v)
{
return (uint8_t)(v | ~(v - 1)) >> ((sizeof(v) * 8) - 1);
}
#endif
#ifndef HAVE_CRYPTO_CT_NE_ZERO_MASK_U8
static inline uint8_t
crypto_ct_ne_zero_mask_u8(uint8_t v)
{
return 0 - crypto_ct_ne_zero_u8(v);
}
#endif
#ifndef HAVE_CRYPTO_CT_EQ_ZERO_U8
static inline int
crypto_ct_eq_zero_u8(uint8_t v)
{
return 1 - crypto_ct_ne_zero_u8(v);
}
#endif
#ifndef HAVE_CRYPTO_CT_EQ_ZERO_MASK_U8
static inline uint8_t
crypto_ct_eq_zero_mask_u8(uint8_t v)
{
return 0 - crypto_ct_eq_zero_u8(v);
}
#endif
#ifndef HAVE_CRYPTO_CT_NE_U8
static inline int
crypto_ct_ne_u8(uint8_t a, uint8_t b)
{
return crypto_ct_ne_zero_u8(a - b);
}
#endif
#ifndef HAVE_CRYPTO_CT_NE_MASK_U8
static inline uint8_t
crypto_ct_ne_mask_u8(uint8_t a, uint8_t b)
{
return 0 - crypto_ct_ne_u8(a, b);
}
#endif
#ifndef HAVE_CRYPTO_CT_EQ_U8
static inline int
crypto_ct_eq_u8(uint8_t a, uint8_t b)
{
return crypto_ct_eq_zero_u8(a - b);
}
#endif
#ifndef HAVE_CRYPTO_CT_EQ_MASK_U8
static inline uint8_t
crypto_ct_eq_mask_u8(uint8_t a, uint8_t b)
{
return 0 - crypto_ct_eq_u8(a, b);
}
#endif
/*
* crypto_load_be32toh() loads a 32 bit unsigned big endian value as a 32 bit
* unsigned host endian value, from the specified address in memory. The memory
* address may have any alignment.
*/
#ifndef HAVE_CRYPTO_LOAD_BE32TOH
static inline uint32_t
crypto_load_be32toh(const uint8_t *src)
{
uint32_t v;
memcpy(&v, src, sizeof(v));
return be32toh(v);
}
#endif
/*
* crypto_store_htobe32() stores a 32 bit unsigned host endian value as a 32 bit
* unsigned big endian value, at the specified address in memory. The memory
* address may have any alignment.
*/
#ifndef HAVE_CRYPTO_STORE_HTOBE32
static inline void
crypto_store_htobe32(uint8_t *dst, uint32_t v)
{
v = htobe32(v);
memcpy(dst, &v, sizeof(v));
}
#endif
/*
* crypto_load_be64toh() loads a 64 bit unsigned big endian value as a 64 bit
* unsigned host endian value, from the specified address in memory. The memory
* address may have any alignment.
*/
#ifndef HAVE_CRYPTO_LOAD_BE64TOH
static inline uint64_t
crypto_load_be64toh(const uint8_t *src)
{
uint64_t v;
memcpy(&v, src, sizeof(v));
return be64toh(v);
}
#endif
/*
* crypto_store_htobe64() stores a 64 bit unsigned host endian value as a 64 bit
* unsigned big endian value, at the specified address in memory. The memory
* address may have any alignment.
*/
#ifndef HAVE_CRYPTO_STORE_HTOBE64
static inline void
crypto_store_htobe64(uint8_t *dst, uint64_t v)
{
v = htobe64(v);
memcpy(dst, &v, sizeof(v));
}
#endif
/*
* crypto_load_le32toh() loads a 32 bit unsigned little endian value as a 32 bit
* unsigned host endian value, from the specified address in memory. The memory
* address may have any alignment.
*/
#ifndef HAVE_CRYPTO_LOAD_LE32TOH
static inline uint32_t
crypto_load_le32toh(const uint8_t *src)
{
uint32_t v;
memcpy(&v, src, sizeof(v));
return le32toh(v);
}
#endif
/*
* crypto_store_htole32() stores a 32 bit unsigned host endian value as a 32 bit
* unsigned little endian value, at the specified address in memory. The memory
* address may have any alignment.
*/
#ifndef HAVE_CRYPTO_STORE_HTOLE32
static inline void
crypto_store_htole32(uint8_t *dst, uint32_t v)
{
v = htole32(v);
memcpy(dst, &v, sizeof(v));
}
#endif
#ifndef HAVE_CRYPTO_ROL_U32
static inline uint32_t
crypto_rol_u32(uint32_t v, size_t shift)
{
return (v << shift) | (v >> (32 - shift));
}
#endif
#ifndef HAVE_CRYPTO_ROR_U32
static inline uint32_t
crypto_ror_u32(uint32_t v, size_t shift)
{
return (v << (32 - shift)) | (v >> shift);
}
#endif
#ifndef HAVE_CRYPTO_ROL_U64
static inline uint64_t
crypto_rol_u64(uint64_t v, size_t shift)
{
return (v << shift) | (v >> (64 - shift));
}
#endif
#ifndef HAVE_CRYPTO_ROR_U64
static inline uint64_t
crypto_ror_u64(uint64_t v, size_t shift)
{
return (v << (64 - shift)) | (v >> shift);
}
#endif
void crypto_cpu_caps_init(void);
uint64_t crypto_cpu_caps_ia32(void);
#endif
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