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Example: add the multilevel_build_no_stdlib example
- This commit add an example demonstrating how to build mlkem-native without the standard library (-nostdlib) - Create an example folder named `multilevel_build_no_stdlib` - Add the `example_no_stdlib_config.h` reference from `test/custom_stdlib_config.h`, this config provide custom implementations for mlk_memcpy and mlk_memset - Add the `-nostdlib` cflag during generating objects file. - Integrate this example to the `tests` script and ./Makefile - Add this example to the `base.yml` for CI testing Signed-off-by: willieyz <[email protected]>
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‎.github/workflows/base.yml‎

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- name: multilevel_build_native
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run: |
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CFLAGS="-O0" make run -C examples/multilevel_build_native
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- name: multilevel_build_no_stdlib
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run: |
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CFLAGS="-O0" make run -C examples/multilevel_build_no_stdlib
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simpasm:
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strategy:
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fail-fast: false

‎BIBLIOGRAPHY.md‎

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* URL: https://csrc.nist.gov/projects/cryptographic-module-validation-program/fips-140-3-ig-announcements
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* Referenced from:
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- [examples/basic_deterministic/mlkem_native/custom_no_randomized_config.h](examples/basic_deterministic/mlkem_native/custom_no_randomized_config.h)
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- [examples/multilevel_build_no_stdlib/mlkem_native/example_no_stdlib_config.h](examples/multilevel_build_no_stdlib/mlkem_native/example_no_stdlib_config.h)
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- [integration/liboqs/config_aarch64.h](integration/liboqs/config_aarch64.h)
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- [integration/liboqs/config_c.h](integration/liboqs/config_c.h)
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- [integration/liboqs/config_x86_64.h](integration/liboqs/config_x86_64.h)

‎Makefile‎

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-make clean -C examples/monolithic_build_multilevel_native >/dev/null
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-make clean -C examples/multilevel_build >/dev/null
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-make clean -C examples/multilevel_build_native >/dev/null
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-make clean -C examples/multilevel_build_no_stdlib > /dev/null

‎examples/README.md‎

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See [multilevel_build](multilevel_build) for an example of how to build one instance of mlkem-native per security level,
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in such a way that level-independent code is shared.
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## Multi-level build without the standard library (C only)
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See multilevel_build_no_stdlib for an example of how to build one instance of mlkem-native per security level without the standard library.
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In this example, `mlk_memcpy` and `mlk_memset` are replaced with custom implementations through [custom_no_stdlib_config.h](../test/custom_stdlib_config.h).
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## Multi-level build (with native code)
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See [multilevel_build_native](multilevel_build_native) for an example of how to build one instance of mlkem-native per

‎examples/multilevel_build/Makefile‎

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-Wno-unknown-pragmas \
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-Wno-unused-command-line-argument \
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-fomit-frame-pointer \
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-DMLK_CONFIG_NAMESPACE_PREFIX=mlkem \
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-DMLK_CONFIG_NAMESPACE_PREFIX=mlkem \
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-std=c99 \
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-pedantic \
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-MMD \

‎examples/multilevel_build_no_stdlib/.gitignore‎

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# SPDX-License-Identifier: Apache-2.0 OR ISC OR MIT
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build

‎examples/multilevel_build_no_stdlib/Makefile‎

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# (SPDX-License-Identifier: CC-BY-4.0)
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.PHONY: build run clean mlkem512_objs mlkem768_objs mlkem1024_objs mlkem_objs size size_objs
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.DEFAULT_GOAL := all
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Q ?= @
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# Append cross-prefix for cross compilation
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# Remove or ignore for native builds
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CC ?= gcc
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SIZE ?= size
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# When called from the root Makefile, CROSS_PREFIX has already been added here
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ifeq (,$(findstring $(CROSS_PREFIX),$(CC)))
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CC := $(CROSS_PREFIX)$(CC)
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endif
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ifeq (,$(findstring $(CROSS_PREFIX),$(SIZE)))
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SIZE := $(CROSS_PREFIX)$(SIZE)
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endif
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# Part A:
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#
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# mlkem-native source and header files
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#
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# If you are not concerned about minimizing for a specific backend,
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# you can just include _all_ source files into your build.
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MLK_SOURCE_ALL := $(wildcard \
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mlkem_native/mlkem/src/*.c \
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mlkem_native/mlkem/src/**/*.c \
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mlkem_native/mlkem/src/**/**/*.c \
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mlkem_native/mlkem/src/**/**/**/*.c)
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MLK_SOURCE:=$(foreach S,$(MLK_SOURCE_ALL),\
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$(if $(findstring /native/,$S),,$S))
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INC=-Imlkem_native -Imlkem_native/mlkem -Imlkem_native/mlkem/src
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BUILD_DIR=build
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MLKEM512_DIR = $(BUILD_DIR)/mlkem512
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MLKEM768_DIR = $(BUILD_DIR)/mlkem768
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MLKEM1024_DIR = $(BUILD_DIR)/mlkem1024
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MLKEM512_OBJS=$(patsubst %,$(MLKEM512_DIR)/%.o,$(MLK_SOURCE))
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MLKEM768_OBJS=$(patsubst %,$(MLKEM768_DIR)/%.o,$(MLK_SOURCE))
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MLKEM1024_OBJS=$(patsubst %,$(MLKEM1024_DIR)/%.o,$(MLK_SOURCE))
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$(MLKEM512_OBJS): $(MLKEM512_DIR)/%.c.o: %.c
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$(Q)[ -d $(@D) ] || mkdir -p $(@D)
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$(Q)$(CC) -nostdlib -DMLK_CONFIG_MULTILEVEL_WITH_SHARED -DMLK_CONFIG_PARAMETER_SET=512 $(INC) $(CFLAGS) -c $^ -o $@
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$(MLKEM768_OBJS): $(MLKEM768_DIR)/%.c.o: %.c
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$(Q)[ -d $(@D) ] || mkdir -p $(@D)
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$(Q)$(CC) -nostdlib -DMLK_CONFIG_MULTILEVEL_NO_SHARED -DMLK_CONFIG_PARAMETER_SET=768 $(INC) $(CFLAGS) -c $^ -o $@
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$(MLKEM1024_OBJS): $(MLKEM1024_DIR)/%.c.o: %.c
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$(Q)[ -d $(@D) ] || mkdir -p $(@D)
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$(Q)$(CC) -nostdlib -DMLK_CONFIG_MULTILEVEL_NO_SHARED -DMLK_CONFIG_PARAMETER_SET=1024 $(INC) $(CFLAGS) -c $^ -o $@
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mlkem512_objs: $(MLKEM512_OBJS)
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mlkem768_objs: $(MLKEM768_OBJS)
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mlkem1024_objs: $(MLKEM1024_OBJS)
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mlkem_objs: mlkem512_objs mlkem768_objs mlkem1024_objs
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# Part B:
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#
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# Random number generator
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#
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# !!! WARNING !!!
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#
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# The randombytes() implementation used here is for TESTING ONLY.
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# You MUST NOT use this implementation outside of testing.
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#
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# !!! WARNING !!!
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RNG_SOURCE=$(wildcard test_only_rng/*.c)
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# Part C:
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#
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# Your application source code
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APP_SOURCE=$(wildcard *.c)
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BIN=test_binary
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CFLAGS := \
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-Wall \
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-Wextra \
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-Werror \
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-Wmissing-prototypes \
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-Wshadow \
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-Werror \
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-Wpointer-arith \
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-Wredundant-decls \
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-Wno-long-long \
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-Wno-unknown-pragmas \
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-Wno-unused-command-line-argument \
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-fomit-frame-pointer \
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-DMLK_CONFIG_NAMESPACE_PREFIX=mlkem \
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-std=c99 \
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-pedantic \
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-MMD \
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-O3 \
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$(CFLAGS)
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BINARY_NAME_FULL=$(BUILD_DIR)/$(BIN)
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CFLAGS += -DMLK_CONFIG_FILE="\"example_no_stdlib_config.h\""
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$(BINARY_NAME_FULL): $(APP_SOURCE) $(RNG_SOURCE) $(MLKEM512_OBJS) $(MLKEM768_OBJS) $(MLKEM1024_OBJS)
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echo "$@"
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mkdir -p $(BUILD_DIR)
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$(CC) $(CFLAGS) $(INC) $^ -o $@
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all: build size_objs
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build: $(BINARY_NAME_FULL)
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run: $(BINARY_NAME_FULL)
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$(EXEC_WRAPPER) ./$(BINARY_NAME_FULL)
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size: build
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@echo "=== Size info for $(BINARY_NAME_FULL) ==="
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$(Q)$(SIZE) $(BINARY_NAME_FULL)
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size_objs: size
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$(Q)echo "=== Object size summary ==="
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$(Q)$(SIZE) $(shell find $(BUILD_DIR)/mlkem512 -name '*.o') | (read header; echo "$$header"; awk '$$5 != 0' | sort -k5 -n -r)
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$(Q)$(SIZE) $(shell find $(BUILD_DIR)/mlkem768 -name '*.o') | (read header; echo "$$header"; awk '$$5 != 0' | sort -k5 -n -r)
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$(Q)$(SIZE) $(shell find $(BUILD_DIR)/mlkem1024 -name '*.o') | (read header; echo "$$header"; awk '$$5 != 0' | sort -k5 -n -r)
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clean:
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rm -rf $(BUILD_DIR)

‎examples/multilevel_build_no_stdlib/README.md‎

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[//]: # (SPDX-License-Identifier: CC-BY-4.0)
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# Multi-level build with no standard library
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This directory contains a minimal example for how to build mlkem-native with support for all 3 security levels
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MLKEM-512, MLKEM-768, and MLKEM-1024, and so that level-independent code is shared. In this example, only the C-backend
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of mlkem-native is used.
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The library is built 3 times in different build directories `build/mlkem{512,768,1024}`. For the MLKEM-512 build, we set
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`MLK_CONFIG_MULTILEVEL_WITH_SHARED` to force the inclusion of all level-independent code in the
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MLKEM512-build. For MLKEM-768 and MLKEM-1024, we set `MLK_CONFIG_MULTILEVEL_NO_SHARED` to not include any
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level-independent code, beside this, this example replace the `mlk_memcpy`, `mlk_memset` with the custom implementation memcpy and memset instead of using the stdlib by adding `example_no_stdlib_config.h`, and add the `-nostdlib` during objects file building,
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Finally, we use the common namespace prefix `mlkem` as `MLK_CONFIG_NAMESPACE_PREFIX` for all three builds;
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the suffix 512/768/1024 will be added to level-dependent functions automatically.
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## Usage
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Build this example with `make build`, run with `make run`.

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