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byteorder.h
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/* * 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