Powershell snippet to help extract the SSL Thumbprint (SHA256) of a remote system

gistfile1.txt

# Modification from https://gist.github.com/lamw/988e4599c0f88d9fc25c9f2af8b72c92
# Thanks to https://stackoverflow.com/a/22251597 for SHA256 details
Function Get-SSLThumbprint256 {
    param(
    [Parameter(
        Position=0,
        Mandatory=$true,
        ValueFromPipeline=$true,
        ValueFromPipelineByPropertyName=$true)
    ]
    [Alias('FullName')]
    [String]$URL
    )

add-type @"
        using System.Net;
        using System.Security.Cryptography.X509Certificates;
            public class IDontCarePolicy : ICertificatePolicy {
            public IDontCarePolicy() {}
            public bool CheckValidationResult(
                ServicePoint sPoint, X509Certificate cert,
                WebRequest wRequest, int certProb) {
                return true;
            }
        }
"@
    [System.Net.ServicePointManager]::CertificatePolicy = new-object IDontCarePolicy

    # Need to connect using simple GET operation for this to work
    Invoke-RestMethod -Uri $URL -Method Get | Out-Null

    $ENDPOINT_REQUEST = [System.Net.Webrequest]::Create("$URL")
    $CERT = $ENDPOINT_REQUEST.ServicePoint.Certificate
    $BYTES = $cert.Export([Security.Cryptography.X509Certificates.X509ContentType]::Cert)
    Set-content -value $BYTES -encoding byte -path $ENV:TMP\cert-temp
    $SSL_THUMBPRINT = (Get-FileHash -Path $ENV:TMP\cert-temp -Algorithm SHA256).Hash
    return $SSL_THUMBPRINT -replace '(..(?!$))','$1:'
}