Initial commit.

client/nojscap.go

@@ -0,0 +1,66 @@
+package main
+
+import (
+    "crypto/sha256"
+    "encoding/hex"
+    "fmt"
+    "os"
+    "strconv"
+)
+
+func checkDifficulty(hash []byte, difficultyBits int) bool {
+    bits := difficultyBits
+    i := 0
+    for bits > 0 {
+        b := hash[i]
+        if bits >= 8 {
+            if b != 0 {
+                return false
+            }
+            bits -= 8
+        } else {
+            mask := byte(0xFF << (8 - bits))
+            if (b & mask) != 0 {
+                return false
+            }
+            bits = 0
+        }
+        i++
+    }
+    return true
+}
+
+func main() {
+    if len(os.Args) != 3 {
+        fmt.Fprintf(os.Stderr, "Usage: %s <challenge_string> <difficulty_bits>\n", os.Args[0])
+        os.Exit(1)
+    }
+
+    challenge := os.Args[1]
+    difficultyBits, err := strconv.Atoi(os.Args[2])
+    if err != nil || difficultyBits <= 0 || difficultyBits > 256 {
+        fmt.Fprintln(os.Stderr, "Difficulty bits must be between 1 and 256")
+        os.Exit(1)
+    }
+
+    var counter uint64 = 0
+
+    for {
+        input := fmt.Sprintf("%s%d", challenge, counter)
+        hash := sha256.Sum256([]byte(input))
+
+        if checkDifficulty(hash[:], difficultyBits) {
+            fmt.Printf("===================\n")
+            fmt.Printf("Found nonce: %d\n", counter)
+            fmt.Printf("===================\n")
+            fmt.Printf("Hash: %s\n", hex.EncodeToString(hash[:]))
+            break
+        }
+
+        if counter&0xFFFFF == 0 {
+            fmt.Printf("Attempts: %d\n", counter)
+        }
+
+        counter++
+    }
+}