PKCE

1.0.2

PKCE.psm1

                                Function New-PKCE {

    <#

    .SYNOPSIS

    Generate OAuth 2.0 Proof Key for Code Exchange (PKCE) 'code_challenge' and 'code_verifier' for use with an OAuth2 Authorization Code Grant flow 

    .DESCRIPTION

    Proof Key for Code Exchange (PKCE) is a mechanism, typically used together with an OAuth2 Authorization Code Grant flow to provide an enhanced level of security when authenticating to an Identity Provider (IDP) to get an access token.

    .PARAMETER codeVerifier

    (optional) ClientID and ClientSecret of the Azure AD registered application with the necessary permissions for MSUser v3.

    .PARAMETER length

    (optional) Length of the code verifier to generate

    .EXAMPLE

    New-PKCE

    .EXAMPLE 

    Generate the code challenge for a specific code verifier

    New-PKCE -codeVerifier 'yfQ3wNRAyimC2qFc0wXI04u6pb2vRWRfUGdbcILFYOxqC1iJ84dSU0uCsVsHoMuv4Mbu5kmQxd3sZspfnPotrIPx1A9DOVmY3ahcKTjJ5xoGz95A7J8zSw86HW5eZpE'

    .EXAMPLE

    Specify the length of the code verifier to generate

    New-PKCE -length 99

    .LINK

    http://darrenjrobinson.com/

    #>

    [cmdletbinding()]

    param(

        [Parameter(Mandatory = $false, ValueFromPipeline = $true)]

        [ValidatePattern('(?# Code Verifier can only contain alphanumeric characters and . ~ - _)^[a-zA-Z0-9-._~]+$')][string]$codeVerifier,

        [Parameter(Mandatory = $false, ValueFromPipeline = $true)]

        [int]$length = 128

    )

    if ($length -gt 128 -or $length -lt 43) {

        Write-Warning "Code Verifier length must be of 43 to 128 characters in length (inclusive)."

        exit 

    }

    if ($codeVerifier) {

        if ($codeVerifier.Length -gt 128 -or $codeVerifier.Length -lt 43) {

            Write-Warning "Code Verifier length must be of 43 to 128 characters in length (inclusive)."

            exit 

        }  

    }

    $pkceTemplate = [pscustomobject][ordered]@{  

        code_verifier  = $null  

        code_challenge = $null   

    }  

    if ($codeVerifier) {

        $hashAlgo = [System.Security.Cryptography.HashAlgorithm]::Create('sha256')

        $hash = $hashAlgo.ComputeHash([System.Text.Encoding]::UTF8.GetBytes($codeVerifier))

        $b64Hash = [System.Convert]::ToBase64String($hash)

        $code_challenge = $b64Hash.Substring(0, 43)

        $code_challenge = $code_challenge.Replace("/","_")

        $code_challenge = $code_challenge.Replace("+","-")

        $code_challenge = $code_challenge.Replace("=","")

        $pkceChallenges = $pkceTemplate.PsObject.Copy()

        $pkceChallenges.code_challenge = $code_challenge 

        $pkceChallenges.code_verifier = $codeVerifier 

        return $pkceChallenges 

    }

    else {

        # PKCE Code verifier. Random alphanumeric string used on the client side

        # From the ASCII Table in Decimal A-Z a-z 0-9

        $codeVerifier = -join (((48..57) * 4) + ((65..90) * 4) + ((97..122) * 4) | Get-Random -Count $length | ForEach-Object { [char]$_ })

        $hashAlgo = [System.Security.Cryptography.HashAlgorithm]::Create('sha256')

        $hash = $hashAlgo.ComputeHash([System.Text.Encoding]::UTF8.GetBytes($codeVerifier))

        $b64Hash = [System.Convert]::ToBase64String($hash)

        $code_challenge = $b64Hash.Substring(0, 43)

        $code_challenge = $code_challenge.Replace("/","_")

        $code_challenge = $code_challenge.Replace("+","-")

        $code_challenge = $code_challenge.Replace("=","")

        $pkceChallenges = $pkceTemplate.PsObject.Copy()

        $pkceChallenges.code_challenge = $code_challenge

        $pkceChallenges.code_verifier = $codeVerifier 

        return $pkceChallenges 

    }

}

Export-ModuleMember -Function 'New-PKCE'

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