Initial commit.

client/nojscap.py

@@ -0,0 +1,52 @@
+import hashlib
+import sys
+
+def check_difficulty(hash_bytes: bytes, difficulty_bits: int) -> bool:
+    bits = difficulty_bits
+    i = 0
+    while bits > 0:
+        byte = hash_bytes[i]
+        if bits >= 8:
+            if byte != 0:
+                return False
+            bits -= 8
+        else:
+            mask = 0xFF << (8 - bits) & 0xFF
+            if (byte & mask) != 0:
+                return False
+            bits = 0
+        i += 1
+    return True
+
+def main():
+    if len(sys.argv) != 3:
+        print(f"Usage: {sys.argv[0]} <challenge_string> <difficulty_bits>")
+        sys.exit(1)
+
+    challenge = sys.argv[1]
+    try:
+        difficulty_bits = int(sys.argv[2])
+    except ValueError:
+        print("Difficulty must be a number")
+        sys.exit(1)
+
+    if difficulty_bits <= 0 or difficulty_bits > 256:
+        print("Difficulty bits must be between 1 and 256")
+        sys.exit(1)
+
+    counter = 0
+    while True:
+        input_str = f"{challenge}{counter}"
+        hash_bytes = hashlib.sha256(input_str.encode()).digest()
+        if check_difficulty(hash_bytes, difficulty_bits):
+            print("====================")
+            print(f"Found nonce: {counter}")
+            print("====================")
+            print(f"Hash: {hash_bytes.hex()}")
+            break
+        if counter & 0xFFFFF == 0:
+            print(f"Attempts: {counter}")
+        counter += 1
+
+if __name__ == "__main__":
+    main()