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byteorder.h8.2 KB · 340 lines
/* * Copyright 2025 The OpenSSL Project Authors. All Rights Reserved. * * Licensed under the Apache License 2.0 (the "License").  You may not use * this file except in compliance with the License.  You can obtain a copy * in the file LICENSE in the source distribution or at * https://www.openssl.org/source/license.html */ #ifndef OPENSSL_BYTEORDER_H#define OPENSSL_BYTEORDER_H#pragma once #include <openssl/e_os2.h>#include <string.h> /* * "Modern" compilers do a decent job of optimising these functions to just a * couple of instruction ([swap +] store, or load [+ swap]) when either no * swapping is required, or a suitable swap instruction is available. */ #if defined(_MSC_VER) && _MSC_VER >= 1300#include <stdlib.h>#pragma intrinsic(_byteswap_ushort)#pragma intrinsic(_byteswap_ulong)#pragma intrinsic(_byteswap_uint64)#define OSSL_HTOBE16(x) _byteswap_ushort(x)#define OSSL_HTOBE32(x) _byteswap_ulong(x)#define OSSL_HTOBE64(x) _byteswap_uint64(x)#define OSSL_BE16TOH(x) _byteswap_ushort(x)#define OSSL_BE32TOH(x) _byteswap_ulong(x)#define OSSL_BE64TOH(x) _byteswap_uint64(x)#define OSSL_HTOLE16(x) (x)#define OSSL_HTOLE32(x) (x)#define OSSL_HTOLE64(x) (x)#define OSSL_LE16TOH(x) (x)#define OSSL_LE32TOH(x) (x)#define OSSL_LE64TOH(x) (x) #elif defined(__GLIBC__) && defined(__GLIBC_PREREQ)#if (__GLIBC_PREREQ(2, 19)) && defined(_DEFAULT_SOURCE)#include <endian.h>#define OSSL_HTOBE16(x) htobe16(x)#define OSSL_HTOBE32(x) htobe32(x)#define OSSL_HTOBE64(x) htobe64(x)#define OSSL_BE16TOH(x) be16toh(x)#define OSSL_BE32TOH(x) be32toh(x)#define OSSL_BE64TOH(x) be64toh(x)#define OSSL_HTOLE16(x) htole16(x)#define OSSL_HTOLE32(x) htole32(x)#define OSSL_HTOLE64(x) htole64(x)#define OSSL_LE16TOH(x) le16toh(x)#define OSSL_LE32TOH(x) le32toh(x)#define OSSL_LE64TOH(x) le64toh(x)#endif #elif defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__)#if defined(__OpenBSD__)#include <sys/types.h>#else#include <sys/endian.h>#endif#define OSSL_HTOBE16(x) htobe16(x)#define OSSL_HTOBE32(x) htobe32(x)#define OSSL_HTOBE64(x) htobe64(x)#define OSSL_BE16TOH(x) be16toh(x)#define OSSL_BE32TOH(x) be32toh(x)#define OSSL_BE64TOH(x) be64toh(x)#define OSSL_HTOLE16(x) htole16(x)#define OSSL_HTOLE32(x) htole32(x)#define OSSL_HTOLE64(x) htole64(x)#define OSSL_LE16TOH(x) le16toh(x)#define OSSL_LE32TOH(x) le32toh(x)#define OSSL_LE64TOH(x) le64toh(x) #elif defined(__APPLE__)#include <libkern/OSByteOrder.h>#define OSSL_HTOBE16(x) OSSwapHostToBigInt16(x)#define OSSL_HTOBE32(x) OSSwapHostToBigInt32(x)#define OSSL_HTOBE64(x) OSSwapHostToBigInt64(x)#define OSSL_BE16TOH(x) OSSwapBigToHostInt16(x)#define OSSL_BE32TOH(x) OSSwapBigToHostInt32(x)#define OSSL_BE64TOH(x) OSSwapBigToHostInt64(x)#define OSSL_HTOLE16(x) OSSwapHostToLittleInt16(x)#define OSSL_HTOLE32(x) OSSwapHostToLittleInt32(x)#define OSSL_HTOLE64(x) OSSwapHostToLittleInt64(x)#define OSSL_LE16TOH(x) OSSwapLittleToHostInt16(x)#define OSSL_LE32TOH(x) OSSwapLittleToHostInt32(x)#define OSSL_LE64TOH(x) OSSwapLittleToHostInt64(x) #endif static ossl_inline ossl_unused unsigned char *OPENSSL_store_u16_le(unsigned char *out, uint16_t val){#ifdef OSSL_HTOLE16    uint16_t t = OSSL_HTOLE16(val);     memcpy(out, (unsigned char *)&t, 2);    return out + 2;#else    *out++ = (val & 0xff);    *out++ = (val >> 8) & 0xff;    return out;#endif} static ossl_inline ossl_unused unsigned char *OPENSSL_store_u16_be(unsigned char *out, uint16_t val){#ifdef OSSL_HTOBE16    uint16_t t = OSSL_HTOBE16(val);     memcpy(out, (unsigned char *)&t, 2);    return out + 2;#else    *out++ = (val >> 8) & 0xff;    *out++ = (val & 0xff);    return out;#endif} static ossl_inline ossl_unused unsigned char *OPENSSL_store_u32_le(unsigned char *out, uint32_t val){#ifdef OSSL_HTOLE32    uint32_t t = OSSL_HTOLE32(val);     memcpy(out, (unsigned char *)&t, 4);    return out + 4;#else    *out++ = (val & 0xff);    *out++ = (val >> 8) & 0xff;    *out++ = (val >> 16) & 0xff;    *out++ = (val >> 24) & 0xff;    return out;#endif} static ossl_inline ossl_unused unsigned char *OPENSSL_store_u32_be(unsigned char *out, uint32_t val){#ifdef OSSL_HTOBE32    uint32_t t = OSSL_HTOBE32(val);     memcpy(out, (unsigned char *)&t, 4);    return out + 4;#else    *out++ = (val >> 24) & 0xff;    *out++ = (val >> 16) & 0xff;    *out++ = (val >> 8) & 0xff;    *out++ = (val & 0xff);    return out;#endif} static ossl_inline ossl_unused unsigned char *OPENSSL_store_u64_le(unsigned char *out, uint64_t val){#ifdef OSSL_HTOLE64    uint64_t t = OSSL_HTOLE64(val);     memcpy(out, (unsigned char *)&t, 8);    return out + 8;#else    *out++ = (val & 0xff);    *out++ = (val >> 8) & 0xff;    *out++ = (val >> 16) & 0xff;    *out++ = (val >> 24) & 0xff;    *out++ = (val >> 32) & 0xff;    *out++ = (val >> 40) & 0xff;    *out++ = (val >> 48) & 0xff;    *out++ = (val >> 56) & 0xff;    return out;#endif} static ossl_inline ossl_unused unsigned char *OPENSSL_store_u64_be(unsigned char *out, uint64_t val){#ifdef OSSL_HTOLE64    uint64_t t = OSSL_HTOBE64(val);     memcpy(out, (unsigned char *)&t, 8);    return out + 8;#else    *out++ = (val >> 56) & 0xff;    *out++ = (val >> 48) & 0xff;    *out++ = (val >> 40) & 0xff;    *out++ = (val >> 32) & 0xff;    *out++ = (val >> 24) & 0xff;    *out++ = (val >> 16) & 0xff;    *out++ = (val >> 8) & 0xff;    *out++ = (val & 0xff);    return out;#endif} static ossl_inline ossl_unused const unsigned char *OPENSSL_load_u16_le(uint16_t *val, const unsigned char *in){#ifdef OSSL_LE16TOH    uint16_t t;     memcpy((unsigned char *)&t, in, 2);    *val = OSSL_LE16TOH(t);    return in + 2;#else    uint16_t b0 = *in++;    uint16_t b1 = *in++;     *val = b0 | (b1 << 8);    return in;#endif} static ossl_inline ossl_unused const unsigned char *OPENSSL_load_u16_be(uint16_t *val, const unsigned char *in){#ifdef OSSL_LE16TOH    uint16_t t;     memcpy((unsigned char *)&t, in, 2);    *val = OSSL_BE16TOH(t);    return in + 2;#else    uint16_t b1 = *in++;    uint16_t b0 = *in++;     *val = b0 | (b1 << 8);    return in;#endif} static ossl_inline ossl_unused const unsigned char *OPENSSL_load_u32_le(uint32_t *val, const unsigned char *in){#ifdef OSSL_LE32TOH    uint32_t t;     memcpy((unsigned char *)&t, in, 4);    *val = OSSL_LE32TOH(t);    return in + 4;#else    uint32_t b0 = *in++;    uint32_t b1 = *in++;    uint32_t b2 = *in++;    uint32_t b3 = *in++;     *val = b0 | (b1 << 8) | (b2 << 16) | (b3 << 24);    return in;#endif} static ossl_inline ossl_unused const unsigned char *OPENSSL_load_u32_be(uint32_t *val, const unsigned char *in){#ifdef OSSL_LE32TOH    uint32_t t;     memcpy((unsigned char *)&t, in, 4);    *val = OSSL_BE32TOH(t);    return in + 4;#else    uint32_t b3 = *in++;    uint32_t b2 = *in++;    uint32_t b1 = *in++;    uint32_t b0 = *in++;     *val = b0 | (b1 << 8) | (b2 << 16) | (b3 << 24);    return in;#endif} static ossl_inline ossl_unused const unsigned char *OPENSSL_load_u64_le(uint64_t *val, const unsigned char *in){#ifdef OSSL_LE64TOH    uint64_t t;     memcpy((unsigned char *)&t, in, 8);    *val = OSSL_LE64TOH(t);    return in + 8;#else    uint64_t b0 = *in++;    uint64_t b1 = *in++;    uint64_t b2 = *in++;    uint64_t b3 = *in++;    uint64_t b4 = *in++;    uint64_t b5 = *in++;    uint64_t b6 = *in++;    uint64_t b7 = *in++;     *val = b0 | (b1 << 8) | (b2 << 16) | (b3 << 24)        | (b4 << 32) | (b5 << 40) | (b6 << 48) | (b7 << 56);    return in;#endif} static ossl_inline ossl_unused const unsigned char *OPENSSL_load_u64_be(uint64_t *val, const unsigned char *in){#ifdef OSSL_LE64TOH    uint64_t t;     memcpy((unsigned char *)&t, in, 8);    *val = OSSL_BE64TOH(t);    return in + 8;#else    uint64_t b7 = *in++;    uint64_t b6 = *in++;    uint64_t b5 = *in++;    uint64_t b4 = *in++;    uint64_t b3 = *in++;    uint64_t b2 = *in++;    uint64_t b1 = *in++;    uint64_t b0 = *in++;     *val = b0 | (b1 << 8) | (b2 << 16) | (b3 << 24)        | (b4 << 32) | (b5 << 40) | (b6 << 48) | (b7 << 56);    return in;#endif} #undef OSSL_HTOBE16#undef OSSL_HTOBE32#undef OSSL_HTOBE64#undef OSSL_BE16TOH#undef OSSL_BE32TOH#undef OSSL_BE64TOH#undef OSSL_HTOLE16#undef OSSL_HTOLE32#undef OSSL_HTOLE64#undef OSSL_LE16TOH#undef OSSL_LE32TOH#undef OSSL_LE64TOH #endif