Attributes
Read & Write
May be used as a hint for encoding a value either implicitly or explicitly by setting it either to :IMPLICIT or to :EXPLICIT. tagging is not set when a ASN.1 structure is parsed using OpenSSL::ASN1.decode.
Class Methods
ext/openssl/lib/openssl/asn1.rb
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# File tmp/rubies/ruby-master/ext/openssl/lib/openssl/asn1.rb, line 107
def initialize(value, tag = nil, tagging = nil, tag_class = nil)
tag ||= ASN1.take_default_tag(self.class)
raise ASN1Error, "must specify tag number" unless tag
if tagging
raise ASN1Error, "invalid tagging method" unless tagging.is_a?(Symbol)
end
tag_class ||= tagging ? :CONTEXT_SPECIFIC : :UNIVERSAL
raise ASN1Error, "invalid tag class" unless tag_class.is_a?(Symbol)
@tagging = tagging
super(value ,tag, tag_class)
end
value: is mandatory.
tag: optional, may be specified for tagged values. If no tag is specified, the UNIVERSAL tag corresponding to the Primitive sub-class is used by default.
tagging: may be used as an encoding hint to encode a value either explicitly or implicitly, see ASN1 for possible values.
tag_class: if tag and tagging are nil then this is set to :UNIVERSAL by default. If either tag or tagging are set then :CONTEXT_SPECIFIC is used as the default. For possible values please cf. ASN1.
Example
int = OpenSSL::ASN1::Integer.new(42) zero_tagged_int = OpenSSL::ASN1::Integer.new(42, 0, :IMPLICIT) private_explicit_zero_tagged_int = OpenSSL::ASN1::Integer.new(42, 0, :EXPLICIT, :PRIVATE)