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CONFIGURE.md

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Options for configuring liboqs builds

The following options can be passed to CMake before the build file generation process to customize the way liboqs is built. The syntax for doing so is: cmake .. [ARGS] [-D<OPTION_NAME>=<OPTION_VALUE>]..., where <OPTON_NAME> is:

BUILD_SHARED_LIBS

Can be set to ON or OFF. When ON, liboqs is built as a shared library.

Default: OFF.

This means liboqs is built as a static library by default.

CMAKE_BUILD_TYPE

Can be set to the following values:

  • Debug: This turns off all compiler optimizations and produces debugging information. When the compiler is Clang, the USE_SANITIZER option can also be specified to enable a Clang sanitizer. This value only has effect when the compiler is GCC or Clang

  • Release: This compiles code at the O3 optimization level, and sets other compiler flags that reduce the size of the binary.

Default: Release.

CMAKE_INSTALL_PREFIX

See the CMake documentation.

OQS_ENABLE_KEM_ALG/OQS_ENABLE_SIG_ALG/OQS_ENABLE_SIG_STFL_ALG

Note: ALG in OQS_ENABLE_KEM_ALG/OQS_ENABLE_SIG_ALG/OQS_ENABLE_SIG_STFL_ALG should be replaced with the specific algorithm name as demonstrated below.

This can be set to ON or OFF, and is ON by default. When OFF, ALG and its code are excluded from the build process. When ON, made available are additional options whereby individual variants of ALG can be excluded from the build process.

For example: if OQS_ENABLE_KEM_BIKE is set to ON, the options OQS_ENABLE_KEM_bike_l1, OQS_ENABLE_KEM_bike_l3, and OQS_ENABLE_KEM_bike_l5 are made available (and are set to be ON by default).

To enable XMSS stateful signature, set OQS_ENABLE_SIG_STFL_XMSS to ON, the options OQS_ENABLE_SIG_STFL_xmss_sha256_h10 and its variants are also set to be ON by default. Similarly, LMS stateful signature family can also be enabled by setting OQS_ENABLE_SIG_STFL_LMS to ON.

For a full list of such options and their default values, consult .CMake/alg_support.cmake.

Default: Unset.

OQS_ALGS_ENABLED

A selected algorithm set is enabled. Possible values are "STD" selecting all algorithms standardized by NIST; "NIST_R4" selecting all algorithms evaluated in round 4 of the NIST PQC competition; "NIST_SIG_ONRAMP" selecting algorithms evaluated in the NIST PQC "onramp" standardization for additional signature schemes; "All" (or any other value) selecting all algorithms integrated into liboqs. Parameter setting "STD" minimizes library size but may require re-running code generator scripts in projects integrating liboqs; e.g., oqs-provider and oqs-boringssl.

Attention: If you use any predefined value (STD or NIST_R4 or NIST_SIG_ONRAMP as of now) for this variable, the values added via OQS_ENABLE_KEM_ALG/OQS_ENABLE_SIG_ALG/OQS_ENABLE_SIG_STFL_ALG variables will be ignored.

Default: All.

OQS_BUILD_ONLY_LIB

Can be ON or OFF. When ON, only liboqs is built, and all the targets: run_tests, gen_docs, and prettyprint are excluded from the build system.

Default: OFF.

OQS_MINIMAL_BUILD

If set, this defines a semicolon-delimited list of algorithms to be contained in a minimal build of liboqs: Only algorithms explicitly set here are included in a build: For example running cmake -DOQS_MINIMAL_BUILD="KEM_kyber_768;SIG_dilithium_3" .. will build a minimum-size liboqs library only containing support for Kyber768 and Dilithium3.

The full list of identifiers that can be set is listed here for KEM algorithms and here for Signature algorithms. The default setting is empty, thus including all supported algorithms in the build.

Default: Unset.

OQS_DIST_BUILD

Can be ON or OFF. When ON, build liboqs for distribution. When OFF, build liboqs for use on a single machine.

The library is always built for a particular architecture, either x86-64, ARM32v7, or ARM64v8, depending on the setting of CMAKE_SYSTEM_PROCESSOR. But liboqs contains code that is optimized for micro-architectures as well, e.g. x86-64 with the AVX2 extension.

When built for distribution, the library will run on any CPU of the target architecture. Function calls will be dispatched to micro-architecture optimized routines at run-time using CPU feature detection.

When built for use on a single machine, the library will only include the best available code for the target micro-architecture (see OQS_OPT_TARGET).

Default: ON.

OQS_USE_CPUFEATURE_INSTRUCTIONS

Note: CPUFEATURE in OQS_USE_CPUFEATURE_INSTRUCTIONS should be replaced with the specific CPU feature as noted below.

These can be set to ON or OFF and take effect if liboqs is built for use on a single machine. By default, the CPU features are automatically determined and set to ON or OFF based on the CPU features available on the build system. The default values can be overridden by providing CMake build options. The available options on x86-64 are: OQS_USE_ADX_INSTRUCTIONS, OQS_USE_AES_INSTRUCTIONS, OQS_USE_AVX_INSTRUCTIONS, OQS_USE_AVX2_INSTRUCTIONS, OQS_USE_AVX512_INSTRUCTIONS, OQS_USE_BMI1_INSTRUCTIONS, OQS_USE_BMI2_INSTRUCTIONS, OQS_USE_PCLMULQDQ_INSTRUCTIONS, OQS_USE_VPCLMULQDQ_INSTRUCTIONS, OQS_USE_POPCNT_INSTRUCTIONS, OQS_USE_SSE_INSTRUCTIONS, OQS_USE_SSE2_INSTRUCTIONS and OQS_USE_SSE3_INSTRUCTIONS. The available options on ARM64v8 are OQS_USE_ARM_AES_INSTRUCTIONS, OQS_USE_ARM_SHA2_INSTRUCTIONS, OQS_USE_ARM_SHA3_INSTRUCTIONS and OQS_USE_ARM_NEON_INSTRUCTIONS.

Default: Options valid on the build machine.

OQS_USE_OPENSSL

To save size and limit the amount of different cryptographic code bases, it is possible to use OpenSSL as a crypto code provider by setting this configuration option.

This can be set to ON or OFF. When ON, the additional options OQS_USE_AES_OPENSSL, OQS_USE_SHA2_OPENSSL, and OQS_USE_SHA3_OPENSSL are made available to control whether liboqs uses OpenSSL's AES, SHA-2, and SHA-3 implementations.

By default,

  • OQS_USE_AES_OPENSSL is ON (on x86-64 only if OQS_DIST_BUILD and OQS_USE_AES_INSTRUCTIONS are not set)
  • OQS_USE_SHA2_OPENSSL is ON
  • OQS_USE_SHA3_OPENSSL is OFF.

These default choices have been made to optimize the default performance of all algorithms. Changing them implies performance penalties.

When OQS_USE_OPENSSL is ON, CMake also scans the filesystem to find the minimum version of OpenSSL required by liboqs (which happens to be 1.1.1). The OPENSSL_ROOT_DIR option can be set to aid CMake in its search.

Default: ON.

OQS_DLOPEN_OPENSSL

Dynamically load OpenSSL through dlopen. When using liboqs from other cryptographic libraries, hard dependency on OpenSSL is sometimes undesirable. If this option is ON, loading of OpenSSL will be deferred until any of the OpenSSL functions is used.

Only has an effect if the system supports dlopen and ELF binary format, such as Linux or BSD family.

Stateful Hash Based Signatures

XMSS and LMS are the two supported Hash-Based Signatures schemes. OQS_ENABLE_SIG_STFL_XMSS and OQS_ENABLE_SIG_STFL_LMS control these algorithms, which are disabled by default. A third variable, OQS_HAZARDOUS_EXPERIMENTAL_ENABLE_SIG_STFL_KEY_SIG_GEN, also controls the ability to generate keys and signatures. This is also disabled by default. Each of these variables can be set to ON or OFF. When all three are ON, stateful signatures are fully functional and can generate key pairs, sign data, and verify signatures. If OQS_HAZARDOUS_EXPERIMENTAL_ENABLE_SIG_STFL_KEY_SIG_GEN is OFF signature verification is the only functional operation.

Standards bodies, such as NIST, recommend that key and signature generation only by done in hardware in order to best enforce the one-time use of secret keys. Keys stored in a file system are extremely susceptible to simultaneous use. When enabled in this library a warning message will be generated by the config process. The name of the configuration variable has been chosen to make every user of this feature aware of its security risks. The OQS team explicitly discourages enabling this variable and reserves the right to remove this feature in future releases if its use causes actual harm. It remains present as long as it is responsibly used as per the stated warnings.

By default,

  • OQS_ENABLE_SIG_STFL_XMSS is OFF
  • OQS_ENABLE_SIG_STFL_LMS is OFF
  • OQS_HAZARDOUS_EXPERIMENTAL_ENABLE_SIG_STFL_KEY_SIG_GEN is OFF.

Default: OFF.

OQS_OPT_TARGET

An optimization target. Only has an effect if the compiler is GCC or Clang and OQS_DIST_BUILD=OFF. Can take any valid input to the -march (on x86-64) or -mcpu (on ARM32v7 or ARM64v8) option for CMAKE_C_COMPILER. Can also be set to one of the following special values.

  • auto: Use -march=native or -mcpu=native (if the compiler supports it).
  • generic: Use -march=x86-64 on x86-64, or -mcpu=cortex-a5 on ARM32v7, or -mcpu=cortex-a53 on ARM64v8.

Default: auto.

OQS_SPEED_USE_ARM_PMU

Can be ON or OFF. When ON, the benchmarking script will try to use the ARMv8 Performance Monitoring Unit (PMU). This will make cycle counts on ARMv8 platforms significantly more accurate.

In order to use this option, user mode access to the PMU must be enabled via a kernel module. If user mode access is not enabled via the kernel module, benchmarking will throw an Illegal Instruction error. A kernel module that has been found to work on several platforms can be found here for Linux. Follow the instructions there (i.e., clone the repository, cd enable_ccr and make install) to load the kernel module, after which benchmarking should work. Superuser permissions are required. Linux header files must also be installed on your platform, which may not be present by default.

Note that this option is not known to work on Apple M1 chips.

Default: OFF.

USE_SANITIZER

This has an effect when the compiler is Clang and when CMAKE_BUILD_TYPE is Debug. Then, it can be set to:

  • Address: This enables Clang's AddressSanitizer
  • Memory: This enables Clang's MemorySanitizer
  • MemoryWithOrigins: This enables Clang's MemorySanitizer with the added functionality of being able to track the origins of uninitialized values
  • Undefined: This enables Clang's UndefinedBehaviorSanitizer. The BLACKLIST_FILE option can be additionally set to a path to a file listing the entities Clang should ignore.
  • Thread: This enables Clang's ThreadSanitizer
  • Leak: This enables Clang's LeakSanitizer

Default: Unset.

OQS_ENABLE_TEST_CONSTANT_TIME

This is used in conjunction with tests/test_constant_time.py to use Valgrind to look for instances of secret-dependent control flow. liboqs must also be compiled with CMAKE_BUILD_TYPE set to Debug.

See the documentation in tests/test_constant_time.py for more usage information.

Default: OFF.

OQS_STRICT_WARNINGS

Can be ON or OFF. When ON, all compiler warnings are enabled and treated as errors. This setting is recommended to be enabled prior to submission of a Pull Request as CI runs with this setting active. When OFF, significantly fewer compiler warnings are enabled such as to avoid undue build errors triggered by (future) compiler warning features/unknown at the development time of this library.

Default: OFF.

OQS_EMBEDDED_BUILD

Can be ON or OFF. When ON, calls to standard library functions typically not present in a bare-metal embedded environment are excluded from compilation.

At the moment, this is only considered for random number generation, as both getentropy() and a file based /dev/urandom are not available on embedded targets (e.g. the Zephyr port).

Attention: When this option is enabled, you have to supply a custom callback for obtaining random numbers using the OQS_randombytes_custom_algorithm() API before accessing the cryptographic API. Otherwise, all key generation and signing operations will fail.

Default: OFF.