Find all possibilities for the last seed word

seed_picker.sh

#! /usr/bin/env bash

function run() {
    read_wordlist

    local input
    printf "Enter seed words: "
    read -r input

    local seed_words=()
    eval "seed_words=($input)"
    local word_count=${#seed_words[@]}

    verify_word_count "$word_count"
    verify_valid_words "${seed_words[@]}"

    printf "Seed has %d words\n\n" "$((word_count + 1))"
    checksum_size=$((("$word_count" + 1) / 3))
    bitstring=$(string_to_bistring "$input")

    local possible_words=()
    printf "Finding all %d words that match the checksum:\n" "$((2 ** (11 - "$checksum_size")))"
    for index in "${!wordlist[@]}"; do
        if verify_checksum "$index"; then
            bip_word="${wordlist[$index]}"
            possible_words[${#possible_words[@]}]="$bip_word"
            echo -n "*"
        else
            echo -n "."
        fi
    done

    printf "\nPossible words: %d\n\n" "${#possible_words[@]}"
    echo "${possible_words[*]}"

}

function verify_word_count() {
    if [ "$1" -lt 11 ] || [ "$1" -gt 23 ] || [ $(("$1" % 3)) -ne 2 ]; then
        printf "Invalid word count: %d\nEnter 11, 14, 17, 20 or 23 words\n" "$1" >&2
        exit 1
    fi
}

function verify_valid_words() {
    local arr=("$@")

    for word in "${arr[@]}"; do
        local found=false
        for bip_word in "${wordlist[@]}"; do
            if [ "$word" == "$bip_word" ]; then
                found=true
                break
            fi
        done

        if ! "$found"; then
            printf "word %s is invalid\n" "$word" >&2
            exit 1
        fi
    done
}

function string_to_bistring() {
    local string=()
    eval "string=($1)"

    local bitstring=""
    for word in "${string[@]}"; do
        for index in "${!wordlist[@]}"; do
            local bip_word="${wordlist[$index]}"
            if [ "$word" == "$bip_word" ]; then
                bitstring+=$(dec_to_bin index)
                break
            fi
        done
    done

    printf "%s" "$bitstring"
}

function verify_checksum() {
    local bits_last_word
    bits_last_word=$(dec_to_bin index)
    local full_bitstring="${bitstring}${bits_last_word}"
    local length=${#full_bitstring}
    local bits_without_checksum="${full_bitstring:0:length-checksum_size}"
    local hex_string
    hex_string=$(bin_to_hex "$bits_without_checksum")
    local hash
    hash=$(sha256 "$hex_string")
    local checksum_bits
    checksum_bits=$(hex_to_bin "${hash:0:2}")
    local actual_checksum_bits="${checksum_bits:0:checksum_size}"
    local input_checksum_bits="${full_bitstring:length-checksum_size}"

    [ "$input_checksum_bits" == "$actual_checksum_bits" ]
}

function sha256() {
    local hex="$1"
    local binary=""
    local i=0

    while [ "$i" -lt "${#hex}" ]; do
        binary+="\\x${hex:i:2}"
        i=$((i += 2))
    done

    printf "%b" "$binary" | sha256sum
}

function dec_to_bin() {
    local n bit
    for ((n = $1; n > 0; n >>= 1)); do
        bit="$((n & 1))$bit"
    done

    printf "%011d" "$bit"
}

function bin_to_hex() {
    local number="$1"
    for ((i = 0; i < ${#number}; i += 4)); do
        local segment="${number:i:4}"
        case $segment in
        0000) hex_digit="0" ;;
        0001) hex_digit="1" ;;
        0010) hex_digit="2" ;;
        0011) hex_digit="3" ;;
        0100) hex_digit="4" ;;
        0101) hex_digit="5" ;;
        0110) hex_digit="6" ;;
        0111) hex_digit="7" ;;
        1000) hex_digit="8" ;;
        1001) hex_digit="9" ;;
        1010) hex_digit="A" ;;
        1011) hex_digit="B" ;;
        1100) hex_digit="C" ;;
        1101) hex_digit="D" ;;
        1110) hex_digit="E" ;;
        1111) hex_digit="F" ;;
        esac
        local hex_number+="$hex_digit"
    done

    printf "%s" "$hex_number"
}

function hex_to_bin() {
    local number="$1"
    for ((i = 0; i < ${#number}; i += 1)); do
        local segment="${number:i:1}"
        case ${segment,} in
        0) bin_string="0000" ;;
        1) bin_string="0001" ;;
        2) bin_string="0010" ;;
        3) bin_string="0011" ;;
        4) bin_string="0100" ;;
        5) bin_string="0101" ;;
        6) bin_string="0110" ;;
        7) bin_string="0111" ;;
        8) bin_string="1000" ;;
        9) bin_string="1001" ;;
        a) bin_string="1010" ;;
        b) bin_string="1011" ;;
        c) bin_string="1100" ;;
        d) bin_string="1101" ;;
        e) bin_string="1110" ;;
        f) bin_string="1111" ;;
        esac
        local bin_number+="$bin_string"
    done

    printf "%s" "$bin_number"
}

function read_wordlist() {
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}

run