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Contents
require 'rasn1/version'
require 'rasn1/types'
require 'rasn1/model'
# Rasn1 is a pure ruby library to parse, decode and encode ASN.1 data.
# @author Sylvain Daubert
module RASN1
# Base error class
class Error < StandardError; end
# ASN.1 encoding/decoding error
class ASN1Error < Error; end
# ASN.1 class error
class ClassError < Error
# @return [String]
def message
"Tag class should be a symbol: #{Types::Base::CLASSES.keys.join(', ')}"
end
end
# Enumerated error
class EnumeratedError < Error; end
# CHOICE error: #chosen not set
class ChoiceError < RASN1::Error
def message
"CHOICE #@name: #chosen not set"
end
end
# Parse a DER/BER string without checking a model
# @note If you want to check ASN.1 grammary, you should define a {Model}
# and use {Model#parse}.
# @note This method will never decode SEQUENCE OF or SET OF objects, as these
# ones use the same encoding as SEQUENCE and SET, respectively.
# @note Real type of tagged value cannot be guessed. So, such tag will
# generate {Types::Base} objects.
# @param [String] der binary string to parse
# @param [Boolean] ber if +true+, decode a BER string, else a DER one
# @return [Types::Base]
def self.parse(der, ber: false)
root = nil
while der.size > 0
type = Types.tag2type(der[0].ord)
type.parse!(der, ber: ber)
root = type if root.nil?
if [Types::Sequence, Types::Set].include? type.class
subder = type.value
ary = []
while subder.size > 0
ary << self.parse(subder)
subder = subder[ary.last.to_der.size..-1]
end
type.value = ary
end
der = der[type.to_der.size..-1]
end
root
end
end
Version data entries
9 entries across 9 versions & 1 rubygems