/*
 * Circe configuration for mlkem-native.
 *
 * Selected instead of contrib/mlkem-native/mlkem/mlkem_native_config.h by
 * building with -DMLK_CONFIG_FILE="circe_mlkem_config.h" (see
 * contrib/meson.build).
 *
 * Circe only needs ML-KEM-768 with the randomized (randombytes) API.
 */

#ifndef MLK_CONFIG_H
#define MLK_CONFIG_H

/* ML-KEM-768. */
#define MLK_CONFIG_PARAMETER_SET 768

/* Namespace prefix for exported symbols (matches the upstream default for
 * 768). */
#define MLK_CONFIG_NAMESPACE_PREFIX PQCP_MLKEM_NATIVE_MLKEM768

/*
 * Randomized API.
 *
 * We deliberately leave MLK_CONFIG_NO_RANDOMIZED_API and
 * MLK_CONFIG_CUSTOM_RANDOMBYTES *unset*: mlkem-native keeps
 * crypto_kem_keypair() and crypto_kem_enc() and expects the consumer to
 * provide
 *
 *     int randombytes(uint8_t *out, size_t outlen);   // 0 on success
 *
 * No deterministic/derand-only build.
 */

/*
 * Implementation-only options.
 *
 * MLK_BUILD_INTERNAL is defined by the library's src/common.h before this file
 * is included, so these only affect the library build, not consumers that
 * merely include mlkem_native.h.
 */
#if defined(MLK_BUILD_INTERNAL)

/*
 * Use the optimized native backends on AArch64 and x86-64, and the portable C
 * backends everywhere else. The architecture is detected from the compiler's
 * predefined macros, matching mlkem-native's own src/sys.h; the actual backend
 * (NEON / AVX2, and the SHA3/Keccak accelerator) is then selected
 * automatically from the -march flags passed by contrib/meson.build.
 */
#if defined(__aarch64__) || defined(__x86_64__)
#define MLK_CONFIG_USE_NATIVE_BACKEND_ARITH
#define MLK_CONFIG_ARITH_BACKEND_FILE "native/meta.h"
#define MLK_CONFIG_USE_NATIVE_BACKEND_FIPS202
#define MLK_CONFIG_FIPS202_BACKEND_FILE "fips202/native/auto.h"
#endif

/*
 * Freestanding build: no libc is linked, so route mlkem-native's memcpy /
 * memset / stack-zeroization through Circe's portable implementations in
 * common/memory.c. This drops the library's <string.h> includes and leaves no
 * unresolved libc symbols.
 */
#define MLK_CONFIG_CUSTOM_MEMCPY
#define MLK_CONFIG_CUSTOM_MEMSET
#define MLK_CONFIG_CUSTOM_ZEROIZE
#if !defined(__ASSEMBLER__)
#include "src/sys.h" /* for MLK_INLINE */
#include <stddef.h>
#include <stdint.h>

/* Defined in common/memory.c */
void *circe_memcpy (void *restrict dest, const void *restrict src, size_t n);
void *circe_memset (void *dest, int value, size_t count);

static MLK_INLINE void *
mlk_memcpy (void *dest, const void *src, size_t n)
{
  return circe_memcpy (dest, src, n);
}
static MLK_INLINE void *
mlk_memset (void *s, int c, size_t n)
{
  return circe_memset (s, c, n);
}
static MLK_INLINE void
mlk_zeroize (void *ptr, size_t len)
{
  circe_memset (ptr, 0, len);
}
#endif /* !__ASSEMBLER__ */

#endif /* MLK_BUILD_INTERNAL */

#endif /* MLK_CONFIG_H */