Utility.PS

1.0.8

ConvertFrom-Base64String.ps1

                                <#

.SYNOPSIS

    Convert Base64 String to Byte Array or Plain Text String.

.DESCRIPTION

.EXAMPLE

    PS C:\>ConvertFrom-Base64String "QSBzdHJpbmcgd2l0aCBiYXNlNjQgZW5jb2Rpbmc="

    Convert Base64 String to String with Default Encoding.

.EXAMPLE

    PS C:\>"QVNDSUkgc3RyaW5nIHdpdGggYmFzZTY0dXJsIGVuY29kaW5n" | ConvertFrom-Base64String -Base64Url -Encoding Ascii

    Convert Base64Url String to String with Ascii Encoding.

.EXAMPLE

    PS C:\>[guid](ConvertFrom-Base64String "5oIhNbCaFUGAe8NsiAKfpA==" -RawBytes)

    Convert Base64 String to GUID.

.INPUTS

    System.String

#>

function ConvertFrom-Base64String {

    [CmdletBinding()]

    [OutputType([byte[]], [string])]

    param (

        # Value to convert

        [Parameter(Mandatory = $true, Position = 0, ValueFromPipeline = $true)]

        [string[]] $InputObjects,

        # Use base64url variant

        [Parameter (Mandatory = $false)]

        [switch] $Base64Url,

        # Output raw byte array

        [Parameter (Mandatory = $false)]

        [switch] $RawBytes,

        # Encoding to use for text strings

        [Parameter (Mandatory = $false)]

        [ValidateSet('Ascii', 'UTF32', 'UTF7', 'UTF8', 'BigEndianUnicode', 'Unicode')]

        [string] $Encoding = 'Default'

    )

    process {

        foreach ($InputObject in $InputObjects) {

            [string] $strBase64 = $InputObject

            if (!$PSBoundParameters.ContainsValue('Base64Url') -and ($strBase64.Contains('-') -or $strBase64.Contains('_'))) { $Base64Url = $true }

            if ($Base64Url) { $strBase64 = $strBase64.Replace('-', '+').Replace('_', '/').PadRight($strBase64.Length + (4 - $strBase64.Length % 4) % 4, '=') }

            [byte[]] $outBytes = [System.Convert]::FromBase64String($strBase64)

            if ($RawBytes) {

                Write-Output $outBytes -NoEnumerate

            }

            else {

                [string] $outString = ([Text.Encoding]::$Encoding.GetString($outBytes))

                Write-Output $outString

            }

        }

    }

}

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# SIG # End signature block