binary2word.bash

#!/bin/bash

# BIP39 wordlist URL
WORDLIST_URL="https://raw.githubusercontent.com/bitcoin/bips/master/bip-0039/english.txt"

# Function to download the BIP39 word list if it doesn't exist
download_wordlist() {
    if [ ! -f bip39_wordlist.txt ]; then
        echo "Downloading BIP39 word list..."
        curl -s $WORDLIST_URL -o bip39_wordlist.txt
        if [ $? -ne 0 ]; then
            echo "Failed to download BIP39 word list."
            exit 1
        fi
    fi
}

# Convert binary to decimal
binary_to_decimal() {
    echo "$((2#$1))"
}

# Get the word from the word list using the index
get_bip39_word() {
    local index=$1
    local word=$(sed -n "$((index))p" bip39_wordlist.txt)
    echo "$word"
}

# Check if input is binary
is_binary() {
    if [[ $1 =~ ^[01]+$ ]]; then
        return 0
    else
        return 1
    fi
}

# Main script execution
main() {
    # Check if input is provided
    if [ -z "$1" ]; then
        echo "Usage: $0 <binary_input>"
        exit 1
    fi

    # Validate input
    if ! is_binary "$1"; then
        echo "Error: Input should only contain 1s and 0s."
        exit 1
    fi

    # Download the BIP39 word list if necessary
    download_wordlist

    # Convert binary input to decimal
    decimal_value=$(binary_to_decimal "$1")

    # Validate if the decimal value is within the wordlist range
    if [ $decimal_value -lt 0 ] || [ $decimal_value -gt 2047 ]; then
        echo "Error: Decimal value out of range (0-2047)."
        exit 1
    fi

    # Get the corresponding word from the BIP39 word list
    bip39_word=$(get_bip39_word "$decimal_value")

    echo "BIP39 Word: $bip39_word"
}

# Run the main function with the provided argument
main "$1"