ISO/IEC 8825-1:2008
Information technology — ASN.1 encoding rules: Specification of Basic Encoding Rules (BER), Canonical Encoding Rules (CER) and Distinguished Encoding Rules (DER) — Part 1:
ISO/IEC 8825-1:2008 specifies a set of basic encoding rules that can be used to derive the specification of a transfer syntax for values of types defined using the notation specified in ISO/IEC 8824-1, ISO/IEC 8824-2, ISO/IEC 8824-3, and ISO/IEC 8824-4, collectively referred to as Abstract Syntax Notation One or ASN.1. These basic encoding rules can also be applied for decoding such a transfer syntax in order to identify the data values being transferred. ISO/IEC 8825-1:2008 also specifies a set of canonical and distinguished encoding rules that restrict the encoding of values to just one of the alternatives provided by the basic encoding rules.
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CONTENTS
FOREWORD
Introduction
1 Scope
2 Normative references
2.1 Identical Recommendations | International Standards
2.2 Additional references
3 Definitions
4 Abbreviations
5 Notation
6 Convention
7 Conformance
8 Basic encoding rules
8.1 General rules for encoding
8.2 Encoding of a boolean value
8.3 Encoding of an integer value
8.4 Encoding of an enumerated value
8.5 Encoding of a real value
8.6 Encoding of a bitstring value
8.7 Encoding of an octetstring value
8.8 Encoding of a null value
8.9 Encoding of a sequence value
8.10 Encoding of a sequence-of value
8.11 Encoding of a set value
8.12 Encoding of a set-of value
8.13 Encoding of a choice value
8.14 Encoding of a value of a prefixed type
8.15 Encoding of an open type
8.16 Encoding of an instance-of value
8.17 Encoding of a value of the embedded-pdv type
8.18 Encoding of a value of the external type
8.19 Encoding of an object identifier value
8.20 Encoding of a relative object identifier value
8.21 Encoding of an OID internationalized resource identifier value
8.22 Encoding of a relative OID internationalized resource identifier value
8.23 Encoding for values of the restricted character string types
8.24 Encoding for values of the unrestricted character string type
8.25 Encoding for values of the useful types
8.26 Encoding for values of the
9 Canonical encoding rules
9.1 Length forms
9.2 String encoding forms
9.3 Set components
10 Distinguished encoding rules
10.1 Length forms
10.2 String encoding forms
10.3 Set components
11 Restrictions on BER employed by both CER and DER
11.1 Boolean values
11.2 Unused bits
11.3 Real values
11.4 GeneralString values
11.5 Set and sequence components with default value
11.6 Set-of components
11.7 GeneralizedTime
11.8 UTCTime
11.9 The
type and the useful time types
12 Use of BER, CER and DER in transfer syntax definition
Annex A
Example of encodings
A.1 ASN.1 description of the record structure
A.2 ASN.1 description of a record value
A.3 Representation of this record value
Annex B
Identification of Encoding Rules
Annex C
Illustration of real value encoding
Series X Data networks, open system communications and security
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CONTENTS
FOREWORD
Introduction
1 Scope
2 Normative references
2.1 Identical Recommendations | International Standards
2.2 Additional references
3 Definitions
4 Abbreviations
5 Notation
6 Convention
7 Conformance
8 Basic encoding rules
8.1 General rules for encoding
8.2 Encoding of a boolean value
8.3 Encoding of an integer value
8.4 Encoding of an enumerated value
8.5 Encoding of a real value
8.6 Encoding of a bitstring value
8.7 Encoding of an octetstring value
8.8 Encoding of a null value
8.9 Encoding of a sequence value
8.10 Encoding of a sequence-of value
8.11 Encoding of a set value
8.12 Encoding of a set-of value
8.13 Encoding of a choice value
8.14 Encoding of a value of a prefixed type
8.15 Encoding of an open type
8.16 Encoding of an instance-of value
8.17 Encoding of a value of the embedded-pdv type
8.18 Encoding of a value of the external type
8.19 Encoding of an object identifier value
8.20 Encoding of a relative object identifier value
8.21 Encoding of an OID internationalized resource identifier value
8.22 Encoding of a relative OID internationalized resource identifier value
8.23 Encoding for values of the restricted character string types
8.24 Encoding for values of the unrestricted character string type
8.25 Encoding for values of the useful types
8.26 Encoding for values of the
9 Canonical encoding rules
9.1 Length forms
9.2 String encoding forms
9.3 Set components
10 Distinguished encoding rules
10.1 Length forms
10.2 String encoding forms
10.3 Set components
11 Restrictions on BER employed by both CER and DER
11.1 Boolean values
11.2 Unused bits
11.3 Real values
11.4 GeneralString values
11.5 Set and sequence components with default value
11.6 Set-of components
11.7 GeneralizedTime
11.8 UTCTime
11.9 The
type and the useful time types
12 Use of BER, CER and DER in transfer syntax definition
Annex A
Example of encodings
A.1 ASN.1 description of the record structure
A.2 ASN.1 description of a record value
A.3 Representation of this record value
Annex B
Identification of Encoding Rules
Annex C
Illustration of real value encoding
Series X Data networks, open system communications and security