Class: OpenSSL::ASN1::Constructive
Relationships & Source Files | |
Super Chains via Extension / Inclusion / Inheritance | |
Class Chain:
self,
ASN1Data
|
|
Instance Chain:
self,
Enumerable,
ASN1Data
|
|
Inherits: |
OpenSSL::ASN1::ASN1Data
|
Defined in: | ext/openssl/ossl_asn1.c |
Overview
The parent class for all constructed encodings. The value
attribute of a Constructive
is always an Array
. Attributes are the same as for ASN1Data, with the addition of #tagging.
SET and SEQUENCE
Most constructed encodings come in the form of a SET or a SEQUENCE. These encodings are represented by one of the two sub-classes of Constructive
:
-
OpenSSL::ASN1::Set
-
OpenSSL::ASN1::Sequence
Please note that tagged sequences and sets are still parsed as instances of ASN1Data. Find further details on tagged values there.
Example - constructing a SEQUENCE
int = OpenSSL::ASN1::Integer.new(1)
str = OpenSSL::ASN1::PrintableString.new('abc')
sequence = OpenSSL::ASN1::Sequence.new( [ int, str ] )
Example - constructing a SET
int = OpenSSL::ASN1::Integer.new(1)
str = OpenSSL::ASN1::PrintableString.new('abc')
set = OpenSSL::ASN1::Set.new( [ int, str ] )
Infinite length primitive values
The only case where Constructive
is used directly is for infinite length encodings of primitive values. These encodings are always constructed, with the contents of the value
Array
being either UNIVERSAL non-infinite length partial encodings of the actual value or again constructive encodings with infinite length (i.e. infinite length primitive encodings may be constructed recursively with another infinite length value within an already infinite length value). Each partial encoding must be of the same UNIVERSAL type as the overall encoding. The value of the overall encoding consists of the concatenation of each partial encoding taken in sequence. The value
array of the outer infinite length value must end with a OpenSSL::ASN1::EndOfContent
instance.
Please note that it is not possible to encode Constructive
without the infinite_length
attribute being set to true
, use OpenSSL::ASN1::Sequence
or OpenSSL::ASN1::Set
in these cases instead.
Example - Infinite length OCTET STRING
partial1 = OpenSSL::ASN1::OctetString.new("\x01")
partial2 = OpenSSL::ASN1::OctetString.new("\x02")
inf_octets = OpenSSL::ASN1::Constructive.new( [ partial1,
partial2,
OpenSSL::ASN1::EndOfContent.new ],
OpenSSL::ASN1::OCTET_STRING,
nil,
:UNIVERSAL )
# The real value of inf_octets is "\x01\x02", i.e. the concatenation
# of partial1 and partial2
inf_octets.infinite_length = true
der = inf_octets.to_der
asn1 = OpenSSL::ASN1.decode(der)
puts asn1.infinite_length # => true
Class Method Summary
-
.new(value [, tag, tagging, tag_class ]) ⇒ Primitive
constructor
Alias for Primitive.new.
ASN1Data - Inherited
Instance Attribute Summary
-
#tagging
rw
May be used as a hint for encoding a value either implicitly or explicitly by setting it either to
:IMPLICIT
or to:EXPLICIT
.
ASN1Data - Inherited
#infinite_length | Never |
#tag | A |
#tag_class | A |
#value | Carries the value of a ASN.1 type. |
Instance Method Summary
-
#each {|asn1| ... } ⇒ 1
Calls block once for each element in
self
, passing that element as parameterasn1
. -
#to_der ⇒ DER-encoded String
See ASN1Data#to_der for details.
ASN1Data - Inherited
Constructor Details
.new(value [, tag, tagging, tag_class ]) ⇒ Primitive
Alias for Primitive.new.
Instance Attribute Details
#tagging (rw)
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.
Instance Method Details
#each {|asn1| ... } ⇒ 1
Calls block once for each element in self
, passing that element as parameter asn1
. If no block is given, an enumerator is returned instead.
Example
asn1_ary.each do |asn1|
puts asn1
end
#to_der ⇒ DER
-encoded
String
See ASN1Data#to_der for details.