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head/contrib/bearssl/src/config.h
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svn:eol-style | null | native \ No newline at end of property |
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/* | |||||
* Copyright (c) 2016 Thomas Pornin <pornin@bolet.org> | |||||
* | |||||
* Permission is hereby granted, free of charge, to any person obtaining | |||||
* a copy of this software and associated documentation files (the | |||||
* "Software"), to deal in the Software without restriction, including | |||||
* without limitation the rights to use, copy, modify, merge, publish, | |||||
* distribute, sublicense, and/or sell copies of the Software, and to | |||||
* permit persons to whom the Software is furnished to do so, subject to | |||||
* the following conditions: | |||||
* | |||||
* The above copyright notice and this permission notice shall be | |||||
* included in all copies or substantial portions of the Software. | |||||
* | |||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |||||
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |||||
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |||||
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |||||
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |||||
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |||||
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |||||
* SOFTWARE. | |||||
*/ | |||||
#ifndef CONFIG_H__ | |||||
#define CONFIG_H__ | |||||
/* | |||||
* This file contains compile-time flags that can override the | |||||
* autodetection performed in relevant files. Each flag is a macro; it | |||||
* deactivates the feature if defined to 0, activates it if defined to a | |||||
* non-zero integer (normally 1). If the macro is not defined, then | |||||
* autodetection applies. | |||||
*/ | |||||
/* | |||||
* When BR_64 is enabled, 64-bit integer types are assumed to be | |||||
* efficient (i.e. the architecture has 64-bit registers and can | |||||
* do 64-bit operations as fast as 32-bit operations). | |||||
* | |||||
#define BR_64 1 | |||||
*/ | |||||
/* | |||||
* When BR_LOMUL is enabled, then multiplications of 32-bit values whose | |||||
* result are truncated to the low 32 bits are assumed to be | |||||
* substantially more efficient than 32-bit multiplications that yield | |||||
* 64-bit results. This is typically the case on low-end ARM Cortex M | |||||
* systems (M0, M0+, M1, and arguably M3 and M4 as well). | |||||
* | |||||
#define BR_LOMUL 1 | |||||
*/ | |||||
/* | |||||
* When BR_SLOW_MUL is enabled, multiplications are assumed to be | |||||
* substantially slow with regards to other integer operations, thus | |||||
* making it worth to make more operations for a given task if it allows | |||||
* using less multiplications. | |||||
* | |||||
#define BR_SLOW_MUL 1 | |||||
*/ | |||||
/* | |||||
* When BR_SLOW_MUL15 is enabled, short multplications (on 15-bit words) | |||||
* are assumed to be substantially slow with regards to other integer | |||||
* operations, thus making it worth to make more integer operations if | |||||
* it allows using less multiplications. | |||||
* | |||||
#define BR_SLOW_MUL15 1 | |||||
*/ | |||||
/* | |||||
* When BR_CT_MUL31 is enabled, multiplications of 31-bit values (used | |||||
* in the "i31" big integer implementation) use an alternate implementation | |||||
* which is slower and larger than the normal multiplication, but should | |||||
* ensure constant-time multiplications even on architectures where the | |||||
* multiplication opcode takes a variable number of cycles to complete. | |||||
* | |||||
#define BR_CT_MUL31 1 | |||||
*/ | |||||
/* | |||||
* When BR_CT_MUL15 is enabled, multiplications of 15-bit values (held | |||||
* in 32-bit words) use an alternate implementation which is slower and | |||||
* larger than the normal multiplication, but should ensure | |||||
* constant-time multiplications on most/all architectures where the | |||||
* basic multiplication is not constant-time. | |||||
#define BR_CT_MUL15 1 | |||||
*/ | |||||
/* | |||||
* When BR_NO_ARITH_SHIFT is enabled, arithmetic right shifts (with sign | |||||
* extension) are performed with a sequence of operations which is bigger | |||||
* and slower than a simple right shift on a signed value. This avoids | |||||
* relying on an implementation-defined behaviour. However, most if not | |||||
* all C compilers use sign extension for right shifts on signed values, | |||||
* so this alternate macro is disabled by default. | |||||
#define BR_NO_ARITH_SHIFT 1 | |||||
*/ | |||||
/* | |||||
* When BR_RDRAND is enabled, the SSL engine will use the RDRAND opcode | |||||
* to automatically obtain quality randomness for seeding its internal | |||||
* PRNG. Since that opcode is present only in recent x86 CPU, its | |||||
* support is dynamically tested; if the current CPU does not support | |||||
* it, then another random source will be used, such as /dev/urandom or | |||||
* CryptGenRandom(). | |||||
* | |||||
#define BR_RDRAND 1 | |||||
*/ | |||||
/* | |||||
* When BR_USE_URANDOM is enabled, the SSL engine will use /dev/urandom | |||||
* to automatically obtain quality randomness for seedings its internal | |||||
* PRNG. | |||||
* | |||||
#define BR_USE_URANDOM 1 | |||||
*/ | |||||
/* | |||||
* When BR_USE_WIN32_RAND is enabled, the SSL engine will use the Win32 | |||||
* (CryptoAPI) functions (CryptAcquireContext(), CryptGenRandom()...) to | |||||
* automatically obtain quality randomness for seedings its internal PRNG. | |||||
* | |||||
* Note: if both BR_USE_URANDOM and BR_USE_WIN32_RAND are defined, the | |||||
* former takes precedence. | |||||
* | |||||
#define BR_USE_WIN32_RAND 1 | |||||
*/ | |||||
/* | |||||
* When BR_USE_UNIX_TIME is enabled, the X.509 validation engine obtains | |||||
* the current time from the OS by calling time(), and assuming that the | |||||
* returned value (a 'time_t') is an integer that counts time in seconds | |||||
* since the Unix Epoch (Jan 1st, 1970, 00:00 UTC). | |||||
* | |||||
#define BR_USE_UNIX_TIME 1 | |||||
*/ | |||||
/* | |||||
* When BR_USE_WIN32_TIME is enabled, the X.509 validation engine obtains | |||||
* the current time from the OS by calling the Win32 function | |||||
* GetSystemTimeAsFileTime(). | |||||
* | |||||
* Note: if both BR_USE_UNIX_TIME and BR_USE_WIN32_TIME are defined, the | |||||
* former takes precedence. | |||||
* | |||||
#define BR_USE_WIN32_TIME 1 | |||||
*/ | |||||
/* | |||||
* When BR_ARMEL_CORTEXM_GCC is enabled, some operations are replaced with | |||||
* inline assembly which is shorter and/or faster. This should be used | |||||
* only when all of the following are true: | |||||
* - target architecture is ARM in Thumb mode | |||||
* - target endianness is little-endian | |||||
* - compiler is GCC (or GCC-compatible for inline assembly syntax) | |||||
* | |||||
* This is meant for the low-end cores (Cortex M0, M0+, M1, M3). | |||||
* Note: if BR_LOMUL is not explicitly enabled or disabled, then | |||||
* enabling BR_ARMEL_CORTEXM_GCC also enables BR_LOMUL. | |||||
* | |||||
#define BR_ARMEL_CORTEXM_GCC 1 | |||||
*/ | |||||
/* | |||||
* When BR_AES_X86NI is enabled, the AES implementation using the x86 "NI" | |||||
* instructions (dedicated AES opcodes) will be compiled. If this is not | |||||
* enabled explicitly, then that AES implementation will be compiled only | |||||
* if a compatible compiler is detected. If set explicitly to 0, the | |||||
* implementation will not be compiled at all. | |||||
* | |||||
#define BR_AES_X86NI 1 | |||||
*/ | |||||
/* | |||||
* When BR_SSE2 is enabled, SSE2 intrinsics will be used for some | |||||
* algorithm implementations that use them (e.g. chacha20_sse2). If this | |||||
* is not enabled explicitly, then support for SSE2 intrinsics will be | |||||
* automatically detected. If set explicitly to 0, then SSE2 code will | |||||
* not be compiled at all. | |||||
* | |||||
#define BR_SSE2 1 | |||||
*/ | |||||
/* | |||||
* When BR_POWER8 is enabled, the AES implementation using the POWER ISA | |||||
* 2.07 opcodes (available on POWER8 processors and later) is compiled. | |||||
* If this is not enabled explicitly, then that implementation will be | |||||
* compiled only if a compatible compiler is detected, _and_ the target | |||||
* architecture is POWER8 or later. | |||||
* | |||||
#define BR_POWER8 1 | |||||
*/ | |||||
/* | |||||
* When BR_INT128 is enabled, then code using the 'unsigned __int64' | |||||
* and 'unsigned __int128' types will be used to leverage 64x64->128 | |||||
* unsigned multiplications. This should work with GCC and compatible | |||||
* compilers on 64-bit architectures. | |||||
* | |||||
#define BR_INT128 1 | |||||
*/ | |||||
/* | |||||
* When BR_UMUL128 is enabled, then code using the '_umul128()' and | |||||
* '_addcarry_u64()' intrinsics will be used to implement 64x64->128 | |||||
* unsigned multiplications. This should work on Visual C on x64 systems. | |||||
* | |||||
#define BR_UMUL128 1 | |||||
*/ | |||||
/* | |||||
* When BR_LE_UNALIGNED is enabled, then the current architecture is | |||||
* assumed to use little-endian encoding for integers, and to tolerate | |||||
* unaligned accesses with no or minimal time penalty. | |||||
* | |||||
#define BR_LE_UNALIGNED 1 | |||||
*/ | |||||
/* | |||||
* When BR_BE_UNALIGNED is enabled, then the current architecture is | |||||
* assumed to use big-endian encoding for integers, and to tolerate | |||||
* unaligned accesses with no or minimal time penalty. | |||||
* | |||||
#define BR_BE_UNALIGNED 1 | |||||
*/ | |||||
#endif |