Functions/Get-CertificateHash.ps1
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<#
.SYNOPSIS Calculates the Hash Value for a given Byte Array (e.g. a DER encoded Certificate) The native GetCertHash seems only to work since .NET 4.8 which is not guaranteed to be present https://docs.microsoft.com/en-us/dotnet/api/system.security.cryptography.x509certificates.x509certificate.getcerthash .PARAMETER Bytes The Byte Array to calculate the Hash Value for. .Parameter HashAlgorithm The Algorithm used to calculate the Hash Value. .OUTPUTS The calculated Hash Value as a String. #> function Get-CertificateHash { [cmdletbinding()] param( [Parameter(Mandatory=$True)] [Byte[]] $Bytes, [Parameter(Mandatory=$False)] [String] [ValidateSet("MD5","SHA1","SHA256","SHA384","SHA512")] $HashAlgorithm = "SHA1" ) begin {} process { # https://docs.microsoft.com/en-us/dotnet/api/system.security.cryptography.hashalgorithm $AlgorithmObject = [System.Security.Cryptography.HashAlgorithm]::Create($HashAlgorithm) $HashBytes = $AlgorithmObject.ComputeHash($Bytes) $HashString = [String]::Empty $HashBytes | ForEach-Object -Process { $HashString += $_.ToString("X") } return $HashString } end {} } |