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DER Encoding
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Primitive. Contents octets are as for a primitive BER encoding.
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Example The DER encoding of the PrintableString value Test
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Section 5.12: SEQUENCE
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The SEQUENCE type denotes an ordered collection of one or more types. The SEQUENCE type is used throughout PKCS and related standards.
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A Layman s Guide to a Subset of ASN.1, BER, and DER
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SEQUENCE { [identifier1] Type1 [{OPTIONAL | DEFAULT value1}], ..., [identifiern] Typen [{OPTIONAL | DEFAULT valuen}]}
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where identifier1 , . . ., identifiern are optional, distinct identifiers for the components, Type1, . . ., Typen are the types of the components, and value1, . . ., valuen are optional default values for the components. The identifiers are primarily for documentation; they do not affect values of the type or their encodings in any way. The OPTIONAL qualifier indicates that the value of a component is optional and need not be present in the sequence. The DEFAULT qualifier also indicates that the value of a component is optional, and assigns a default value to the component when the component is absent. The types of any consecutive series of components with the OPTIONAL or DEFAULT qualifier, as well as of any component immediately following that series, must have distinct tags. This requirement is typically satisfied with explicit or implicit tagging on some of the components.
Example X.509 s Validity type is a SEQUENCE type with two compo-
nents:
Validity ::= SEQUENCE { start UTCTime, end UTCTime }
Here the identifiers for the components are start and end, and the type of both components is UTCTime.
BER Encoding
Constructed. Contents octets are the concatenation of the BER encodings of the values of the components of the sequence, in order of definition, with the following rules for components with the OPTIONAL and DEFAULT qualifiers:
If the value of a component with the OPTIONAL or DEFAULT qualifier is absent from the sequence, then the encoding of that component is not included in the contents octets. If the value of a component with the DEFAULT qualifier is the default value, then the encoding of that component may or may not be included in the contents octets.
Appendix B
DER Encoding
Constructed. Contents octets are the same as the BER encoding, except that if the value of a component with the DEFAULT qualifier is the default value, the encoding of that component is not included in the contents octets.
Sectopm 5.13: SEQUENCE OF
The SEQUENCE OF type denotes an ordered collection of zero or more occurrences of a given type. The SEQUENCE OF type is used in X.501 distinguished names.
ASN.1 Notation
SEQUENCE OF Type
where Type is a type.
Example X.501 s RDNSequence type consists of zero or more occurrences
of the RelativeDistinguishedName type, most significant occurrence first:
RDNSequence ::= SEQUENCE OF RelativeDistinguishedName
BER Encoding
Constructed. Contents octets are the concatenation of the BER encodings of the values of the occurrences in the collection, in order of occurrence.
DER Encoding
Constructed. Contents octets are the concatenation of the DER encodings of the values of the occurrences in the collection, in order of occurrence.
Section 5.14: SET
The SET type denotes an unordered collection of one or more types. The SET type is not used in PKCS.
A Layman s Guide to a Subset of ASN.1, BER, and DER
ASN.1 Notation
SET { [identifier1] Type1 [{OPTIONAL | DEFAULT value1}], ..., [identifiern] Typen [{OPTIONAL | DEFAULT valuen}]}
where identifier1, . . ., identifiern are optional, distinct identifiers for the components, Type1, . . ., Typen are the types of the components, and value1, . . ., valuen are optional default values for the components. The identifiers are primarily for documentation; they do not affect values of the type or their encodings in any way. The OPTIONAL qualifier indicates that the value of a component is optional and need not be present in the set. The DEFAULT qualifier also indicates that the value of a component is optional, and assigns a default value to the component when the component is absent. The types must have distinct tags. This requirement is typically satisfied with explicit or implicit tagging on some of the components.
BER Encoding
Constructed. Contents octets are the concatenation of the BER encodings of the values of the components of the set, in any order, with the following rules for components with the OPTIONAL and DEFAULT qualifiers:
If the value of a component with the OPTIONAL or DEFAULT qualifier is absent from the set, then the encoding of that component is not included in the contents octets. If the value of a component with the DEFAULT qualifier is the default value, then the encoding of that component may or may not be included in the contents octets.
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