crypto-functions.sh

function hex2bin() {
    local data=$1
    echo -n $data | xxd -r -ps
}

function bin2hex() {
    xxd -ps -c1024
}

function to_ascii() {
    local data=$1
    echo -n $data | xxd -ps -c1024
}

function sha1() {
    local magic=$1
    local len=$2
    echo -n $magic | sha1sum | cut -c1-$((2 * $len))
}

function sha2() {
    local magic=$1
    local len=$2
    echo -n $magic | sha256sum | cut -c1-$((2 * $len))
}

function des2_encrypt() {
    local key=$1
    local data=$2
    hex2bin $data | openssl enc -e -des-ede -K $key -nopad | bin2hex
}

function bogus_rnd() {
    local seed=$1
    local len=$2
    local result=""
    local num=$seed
    for ((i = 0; i < $len; i++)); do
        num=$((($num * 125) % 2796203))
        num_hex=$(printf "%02x" $num)
        result="$result${num_hex: -2}"
    done
    echo -n $result
}

# References:

# OpenSSL enc:
# https://www.openssl.org/docs/manmaster/apps/enc.html