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// SPDX-License-Identifier: BSD-2-Clause
// SPDX-FileCopyrightText: Copyright (c) 2025 Vicky Williams <https://que.trolling.win>
// SPDX-FileCopyrightText: Copyright (c) 2025 Runxi Yu <https://runxiyu.org>
#include "sha256.h"
unsigned char challenge[32];
char validate_hash(unsigned char *hash, unsigned char zero_bit_count)
{
unsigned char q = zero_bit_count / 8;
unsigned char r = zero_bit_count % 8;
for (unsigned char i = 0; i < q; i++)
if (hash[i] != 0)
return 0;
if (r > 0) {
unsigned char mask = (unsigned char)(0xFF << (8 - r));
if (hash[q] & mask)
return 0;
}
return 1;
}
unsigned char *get_challenge_ptr()
{
return challenge;
}
unsigned long long solve(unsigned char difficulty)
{
unsigned long long nonce;
SHA256_CTX context;
unsigned char hash[32];
nonce = 0;
for (;;) {
sha256_init(&context);
sha256_update(&context, challenge, sizeof(challenge));
sha256_update(&context, (unsigned char *)(&nonce),
sizeof(nonce));
sha256_final(&context, hash);
if (validate_hash(hash, difficulty))
break;
nonce++;
}
return nonce;
}
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