#include <edsign.cuh>
#include <ed25519.cuh>
#include <sha512.cuh>
__device__ __forceinline__ void expand_key(unsigned char* expanded, const unsigned char* secret) {
    struct sha512_state s;
    memcpy(&s, &sha512_initial_state, sizeof(s));
    sha512_final(&s, secret);
    sha512_get(&s, expanded);
    expanded[0] &= 0xf8;
    expanded[31] &= 0x7f;
    expanded[31] |= 0x40;
}
__device__ __forceinline__ void sm_pack(unsigned char* r, const unsigned char* k) {
    struct ed25519_pt p;
    ed25519_smult(&p, k);
    unsigned char x[32], y[32];
    ed25519_unproject(x, y, &p);
    ed25519_pack(r, x, y);
}
__device__ void ed25519_keygen(unsigned char private_key[64], unsigned char public_key[32], unsigned char random_seed[32]) {
    unsigned char expanded[64];
    expand_key(expanded, random_seed);
    sm_pack(public_key, expanded);
    memcpy(private_key, random_seed, 32);
    memcpy(private_key + 32, public_key, 32);
}