Private/x509/ConvertTo-Pem.ps1
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<#
.SYNOPSIS Converts a DER encoded byte array to a PEM encoded string. .DESCRIPTION Converts a DER encoded byte array to a PEM encoded string according to RFC 7468. https://datatracker.ietf.org/doc/html/rfc7468 .PARAMETER DerBytes The DER encoded byte array to convert. .PARAMETER Label The label to use in the PEM header and footer. If not specified, no header or footer will be added. #> Function ConvertTo-Pem { [CmdletBinding()] Param( [Parameter(Mandatory)] [Byte[]]$DerBytes, [String]$Label ) $StringBuilder = New-Object System.Text.StringBuilder If (-not [String]::IsNullOrEmpty($Label)) { $StringBuilder.AppendLine("-----BEGIN $($Label.ToUpper())-----") | Out-Null } $RawString = [System.Convert]::ToBase64String($DerBytes) for ($i = 0; $i -lt $RawString.Length; $i += 64) { $StringBuilder.AppendLine($RawString.Substring($i, [System.Math]::Min(64, $RawString.Length - $i))) | Out-Null } If (-not [String]::IsNullOrEmpty($Label)) { $StringBuilder.Append("-----END $($Label.ToUpper())-----") | Out-Null } Return $StringBuilder.ToString() } |