From 13c4a755e66cbff0ac0c65eece015bddbe152ed2 Mon Sep 17 00:00:00 2001 From: Runxi Yu Date: Mon, 24 Mar 2025 01:30:53 +0800 Subject: Use a WebAssembly solver --- wasm/solver.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) create mode 100644 wasm/solver.c (limited to 'wasm/solver.c') diff --git a/wasm/solver.c b/wasm/solver.c new file mode 100644 index 0000000..f1c4fa6 --- /dev/null +++ b/wasm/solver.c @@ -0,0 +1,51 @@ +#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; + + while(1) { + 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)) { + // we did it!! + break; + } + + nonce++; + } + + return nonce; +} -- cgit v1.2.3