ISO/IEC 8825-1:2002
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 8825-1:2002 defines a set of Basic Encoding Rules (BER) that may be applied to values of types defined using the ASN.1 notation. Application of these encoding rules produces a transfer syntax for such values. It is implicit in the specification of these encoding rules that they are also used for decoding. ISO/IEC 8825-1:2002 defines also a set of Distinguished Encoding Rules (DER) and a set of Canonical Encoding Rules (CER) both of which provide constraints on the Basic Encoding Rules (BER). The key difference between them is that DER uses the definite length form of encoding while CER uses the indefinite length form. DER is more suitable for the small encoded values, while CER is more suitable for the large ones. It is implicit in the specification of these encoding rules that they are also used for decoding.
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Information technology — ASN.1 encoding rules: Specification of Basic Encoding Rules (BER), Canonical Encoding Rules (CER) and Distinguished Encoding Rules (DER)
Contents
Foreword
Introduction
Information technology – ASN.1 encoding rules: Specification of Basic Encoding Rules (BER), Canonical ...
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 tagged value
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 for values of the restricted character string types
8.22 Encoding for values of the unrestricted character string type
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
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 - Assignment of object identifier values
Annex C - Illustration of real value encoding
Amendments
- ISO/IEC 8825-1:2002/Amd 1:2004. Published 12/10/2004
- ISO/IEC 8825-1:2002/Amd 2:2007. Published 22/10/2007
- ISO/IEC 8825-1:2002/AMD1:2004. Published 12/10/2004
- ISO/IEC 8825-1:2002/AMD2:2007. Published 22/10/2007
- ISO/IEC 8825-1:2002/Cor 1:2007. Published 21/11/2007
- ISO/IEC 8825-1:2002/COR1:2007. Published 21/11/2007
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Information technology — ASN.1 encoding rules: Specification of Basic Encoding Rules (BER), Canonical Encoding Rules (CER) and Distinguished Encoding Rules (DER)
Contents
Foreword
Introduction
Information technology – ASN.1 encoding rules: Specification of Basic Encoding Rules (BER), Canonical ...
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 tagged value
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 for values of the restricted character string types
8.22 Encoding for values of the unrestricted character string type
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
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 - Assignment of object identifier values
Annex C - Illustration of real value encoding
Amendments
- ISO/IEC 8825-1:2002/Amd 1:2004. Published 12/10/2004
- ISO/IEC 8825-1:2002/Amd 2:2007. Published 22/10/2007
- ISO/IEC 8825-1:2002/AMD1:2004. Published 12/10/2004
- ISO/IEC 8825-1:2002/AMD2:2007. Published 22/10/2007
- ISO/IEC 8825-1:2002/Cor 1:2007. Published 21/11/2007
- ISO/IEC 8825-1:2002/COR1:2007. Published 21/11/2007