first commit

README.md

@@ -1,2 +1,33 @@
 # bip39checksum-go
-A simple go program to find the last BIP39 mnemonic word
+
+A simple program written in Go to find the last BIP39 mnemonic word (checksum).
+
+This program test all possible words and print them.
+
+
+Inspired by: [GitHub - massmux/bip39checksum: BIP39 checksum word finder](https://github.com/massmux/bip39checksum)
+
+## Dependencies
+
+`go get github.com/tyler-smith/go-bip39`
+
+
+
+## How to run
+
+### Run the program yourself
+
+`go run bip39checksum.go`
+
+### Use the compiled binary (Linux)
+
+1. `chmod +x bip39checksum.go`
+
+2. ./bip39checksum
+
+
+
+## Disclamer
+
+This program is provided "as is", I am not responsible for any loss of funds caused by the use of this program.
+It is strongly recommended to use it on an offline computer.

bip39checksum.go

@@ -0,0 +1,50 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"github.com/tyler-smith/go-bip39"
+	"os"
+)
+
+// 23 words for testing
+// loud omit domain valve topic engine velvet chat foil few wrap unable practice snap gift version brass board broom loud amateur cabin toss
+
+func main() {
+	reader := bufio.NewReader(os.Stdin)
+
+	fmt.Print("Please insert your mnemonic phrase: ")
+	input, _ := reader.ReadString('\n')
+	words := brute(input)
+	n := len(words)
+
+	if n > 0 {
+		fmt.Println("\nPossible last words for this mnemonic: ")
+		PrintWords(words)
+	} else {
+		fmt.Println("Mnemonic invalid")
+	}
+
+}
+
+func brute(mnemonic string) []string {
+	english := bip39.GetWordList()
+	var valid_words []string
+
+	for _, word := range english {
+		current := mnemonic + " " + word
+		valid := bip39.IsMnemonicValid(current)
+
+		if valid {
+			valid_words = append(valid_words, word)
+		}
+	}
+	return valid_words
+}
+
+func PrintWords(arr []string) {
+	for _, w := range arr {
+		fmt.Printf("- %s\n", w)
+	}
+
+}