$passwordHash-Path = "/keymgr-password-hash";
$database-Path     = "/keymgr-db";

function md5 ($string) {

    $md5  = New-Object -TypeName System.Security.Cryptography.MD5CryptoServiceProvider;
    $utf8 = New-Object -TypeName System.Text.UTF8Encoding;
    return [System.BitConverter]::ToString($md5.ComputeHash($utf8.GetBytes($string)));

}

function compareHashes ($password) {

    if(md5($password) == Get-Content $passwordHash-Path) {

        return 1;

    } else {

        return 0;

    };

}

function requirePassword () {

    echo "Enter the password. Ctrl + C to abort.";
    $password = Read-Host -prompt "Password : ";

    if(!compareHashes($password)) {

        echo "Sorry, try again"
        requirePassword;

    };

    return $password;

}

function readFromDB ($password) {

    $contents = Get-Content $database-Path;
    $string = ConvertFrom-SecureString -secureString $contents -secureKey $password;

    $string.split("\n");
    foreach ($string as $value) {

        $value.split(":");

    };

    return $string;

}

function listAllPairs () {

    $password = requirePassword;
    echo readFromDB($password);

}

function writeToDB ($pairs, $password) {

    foreach ($pairs as $key => $value) {

        $string += $base64encode($key) + ":" + $base64encode($value) + "\n";

    };

    return ConvertTo-SecureString -string $string -secureKey $password > "/windows/keymgr.db";


}

function base64encode ($string) {

    $bytes = [System.Text.Encoding]::Unicode.GetBytes($string);
    return [Convert]::ToBase64String($bytes);

}

function setPair ($key, $value) {

    $password = requirePassword;

    $pairs = readFromDB($password);
    $pairs[$key] = $value;

    writeToDB($pairs, $password);

}

function removePair ($key, $value) {

    $password = requirePassword;
    $pairs = $readFromDB($password);
    $pairs[$key] = $value;

}

function keymgr ($operator, $key, $value) {

    switch ($operator) {

        "set" {

            setPair($key, $value);

        }

        "remove" {

            removePair($key);

        }

        default {

            listAllPairs;

        }

    };

}