Decrypt-NugetCredentials.ps1

$config = ([XML](Get-Content -Path "$env:APPDATA\NuGet\nuget.config"))

Add-Type -AssemblyName 'System.Security'

function Decrypt-NugetPassword ([string] $encryptedString)
{
    $entropyBytes = [System.Text.Encoding]::UTF8.GetBytes('NuGet')
    $encryptedBytes = [Convert]::FromBase64String($encryptedString)
    $passwordBytes = [System.Security.Cryptography.ProtectedData]::Unprotect($encryptedBytes, $entropyBytes, [System.Security.Cryptography.DataProtectionScope]::CurrentUser)
    return [System.Text.Encoding]::UTF8.GetString($passwordBytes)
}

$config.configuration.packageSourceCredentials.ChildNodes |
    ForEach-Object {
        [PSCustomObject]@{ 
            Name = $_.Name
            Username = ($_.add | Where-Object 'key' -eq 'Username').value
            Password = Decrypt-NugetPassword(($_.add | Where-Object 'key' -eq 'Password').value)
        }
    }