Momentum-Apps/flipbip/lib/crypto/ed25519_donna/ed25519_donna_portable.h

#define mul32x32_64(a, b) (((uint64_t)(a)) * (b))

#include <stdlib.h>
#include <string.h>
#include <stdint.h>

#define DONNA_INLINE
#undef ALIGN
#define ALIGN(x) __attribute__((aligned(x)))

static inline void U32TO8_LE(unsigned char* p, const uint32_t v) {
    p[0] = (unsigned char)(v);
    p[1] = (unsigned char)(v >> 8);
    p[2] = (unsigned char)(v >> 16);
    p[3] = (unsigned char)(v >> 24);
}

static inline uint32_t U8TO32_LE(const unsigned char* p) {
    return (
        ((uint32_t)(p[0])) | ((uint32_t)(p[1]) << 8) | ((uint32_t)(p[2]) << 16) |
        ((uint32_t)(p[3]) << 24));
}