Functions/Convert-StringToDER.ps1
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<#
.SYNOPSIS Encodes a String in DER #> Function Convert-StringToDER { [cmdletbinding()] param ( [Parameter(Mandatory=$True)] [ValidateNotNullOrEmpty()] [String] $IdentifierOctets, [Parameter(Mandatory=$True)] [ValidateNotNullOrEmpty()] [String] $ContentOctets ) process { # Length of hex fqdn, in hex $LengthOctets = Get-Asn1LengthOctets -strLen $($ContentOctets.Length) # Constructed, definite-length method # This method applies to simple string types, structured types, types derived simple # string types and structured types by implicit tagging, and types derived from # anything by explicit tagging. It requires that the length of the value be known in advance. # The parts of the BER encoding are as follows: # Identifier octets. # These identify the class and tag number of the ASN.1 value, and indicate whether the # method is primitive or constructed. # Length octets. # For the definite-length methods, these give the number of contents octets. # Contents octets. # For the primitive, definite-length method, these give a concrete representation of the value. # Assembling the node return "${IdentifierOctets}${LengthOctets}${ContentOctets}" } } |