encryptdecrypt

0.8.1

Private/NewCryptographyKey.ps1

                                <#

    .SYNOPSIS 

    Generates a random cryptography key.

    .DESCRIPTION

    Generates a random cryptography key based on the desired key size.

    .PARAMETER Algorithm

    Algorithm to generate key for.

    .PARAMETER KeySize

    Number of bits the generated key will have.

    .PARAMETER AsPlainText

    Returns a String instead of SecureString.

    .OUTPUTS

    System.Security.SecureString. New-CryptographyKey return the key as a SecureString by default.

    System.String. New-CryptographyKey will return the key in plain text as a string if the -AsPlainText parameter is specified.

    .EXAMPLE

    $key = New-CryptographyKey

    This example generates a random 256-bit AES key and stores it in the variable $key.

    .NOTES

    Author: Tyler Siegrist

    Date: 9/22/2017

#>

function NewCryptographyKey() {

    [CmdletBinding()]

    [OutputType([System.Security.SecureString])]

    [OutputType([String], ParameterSetName='PlainText')]

    Param(

        [Parameter(Mandatory=$false, Position=1)]

        [ValidateSet('AES','DES','RC2','Rijndael','TripleDES')]

        [String]$Algorithm='AES',

        [Parameter(Mandatory=$false, Position=2)]

        [Int]$KeySize,

        [Parameter(ParameterSetName='PlainText')]

        [Switch]$AsPlainText

    )

    Process

    {

        try

        {

            $Crypto = [System.Security.Cryptography.SymmetricAlgorithm]::Create($Algorithm)

            if($PSBoundParameters.ContainsKey('KeySize')){

                $Crypto.KeySize = $KeySize

            }

            $Crypto.GenerateKey()

            if($AsPlainText)

            {

                return [System.Convert]::ToBase64String($Crypto.Key)

            }

            else

            {

                return [System.Convert]::ToBase64String($Crypto.Key) | ConvertTo-SecureString -AsPlainText -Force

            }

        }

        catch

        {

            Write-Error $_

        }

    }

}

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