Abstract Syntax Notation One ASN.1. ASN.1 Abstract Syntax Notation One
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1 Kommunikationssysteme (KSy) - Block 7 Abstract Syntax Notation One ASN.1 Dr. Andreas Steffen A. Steffen, , KSy_ASN1.ppt 1 ASN.1 Abstract Syntax Notation One Standards and applications using ASN.1 Abstract syntax and transfer syntax Simple types basic types, character string types Date and time types Type definitions Subtype definitions Value Assignments Object identifier type (OID) Structured types sequence, set Context-specific tags BER Basic Encoding Rules Type length value rule Type tags Encoding of identifier field Encoding of tag classes Encoding of tag numbers Encoding of length field Encoding of integers Encoding of sequences Encoding of object identifiers Alternative encoding rules PER, DER, CER
2 Standards and Applications using ASN.1 X.400 Message Handling System / X.500 Directory Services LDAP based Directories / X.509 Digital Certificates RSA Public Key Cryptography Standards Storage and Transmission of Keys / Certificates (PKCS #12) Secure Electronic Transaction (SET) Visa / Mastercard H.323 / T.120 Multimedia Communication Standards Definition and Exchange of Multimedia Terminal Capabilities Telecommunications Management Network (TMN) Performance / Fault and Configuration Management Information Unicode Worldwide Character Standard Universal 16-bit Character Set comprising all written languages Simple Network Transfer Protocol (SNMP) Management Information Base (MIB) / SNMP PDUs A. Steffen, , KSy_ASN1.ppt 2 Source: OSS Nokalva,
3 The OSI Approach: Abstract Syntax and Transfer Syntax User User User Presentation Mapping Local Mapping Local Storage Application Component Encoding Rules Abstract Syntax Application Component Encoding Rules Local Mapping Local Storage Data Transfer Component Transfer Syntax Data Transfer Component A. Steffen, , KSy_ASN1.ppt 3 Abstract Syntax An abstract syntax provides a set of formal rules for describing the structure of objects independent of both the user presentation and the machine-specific encoding techniques used for storage and transmission of the objects. Transfer Syntax The transfer syntax is the actual representation of data as it is transmitted over a network. Often data is represented by a stream of octets. Encoding Rules Encoding rules define the mapping of the abstract syntax used to represent data objects into the transfer syntax used to transmit the objects over a physical transmission channel.
4 Abstract Syntax Notation and Encoding Rules ASN.1 - Abstract Syntax Notation One ITU-T X.680 / ISO (1997) obsoletes ITU-T X.208 BER - Basic Encoding Rules of ASN.1 ITU-T X.690 / ISO (1997) obsoletes ITU-T X.209 A. Steffen, , KSy_ASN1.ppt 4 Abstract Syntax Notation One ASN.1 is especially well suited for the representation of the complex, variable and extensible data structures used in modern communications applications. Basic Encoding Rules of ASN.1 BER encodes ASN.1 objects into a series of octet strings that can be transmitted over an octet oriented communications channel
5 ASN.1 Simple Types I Basic Types BOOLEAN INTEGER ENUMERATED REAL BIT STRING OCTET STRING Character String Types (various subsets of ISO ) NumericString (0-9,<space>) PrintableString (0-9,A-Z,a-z,<space>,<special>) VisibleString GraphicString TeletexString UTF8String IA5String A. Steffen, , KSy_ASN1.ppt 5
6 ASN.1 Simple Types II Object Types OBJECT IDENTIFIER ObjectDescriptor Miscellaneous Types NULL UTCTime yymmdd hhmm[ss] <local offset from UTC> GeneralizedTime yyyymmdd hhmm[ss] <local offset from UTC> A. Steffen, , KSy_ASN1.ppt 6 NULL The NULL type denotes a null value. OBJECT IDENTIFIER The OBJECT IDENTIFIER type denotes an object identifier, a sequence of integer components that identifies an object such as an algorithm, an attribute type, or perhaps a registration authority that defines other object identifiers. An OBJECT IDENTIFIER value can have any number of components, and components can generally have any nonnegative value. UTCTime yy = : yy = : GeneralizedTime Mandatory starting with the year 2050
7 ASN.1 Type Definitions Syntax: <type name> ::= <type> Examples: Counter ::= INTEGER IpAddress ::= OCTET STRING Months ::= ENUMERATED {january (1), february (2), march (3), april (4), may (5), june (6), july (7), august (8), september (9), october (10), november (11), december (12)} A. Steffen, , KSy_ASN1.ppt 7
8 ASN.1 Subtype Definitions Syntax: <subtype name> ::= <type> ( <constraint> ) Examples: Counter ::= INTEGER ( ) IpAddress ::= OCTET STRING ( SIZE(4) ) Spring ::= Months ( march april may ) Summer ::= Months ( june july august ) SmallPrime ::= INTEGER ( ) ExportKey ::= BIT STRING ( SIZE(40) ) A. Steffen, , KSy_ASN1.ppt 8
9 ASN.1 Value Assignments I Syntax: <value name> <type> ::= <value> Examples: ipinreceives Counter ::= 2450 iproutemask IpAddress ::= 'FFFFFF00'H currentmonth Months ::= february currenttime UTCTime ::= " " givenname VisibleString ::= "Andreas" married BOOLEAN ::= TRUE faxmessage BIT STRING ::= ' 'B encryptionkey ExportKey ::= 'A1B2C3D4E5'H A. Steffen, , KSy_ASN1.ppt 9
10 ASN.1 Value Assignments II OBJECT IDENTIFIER root ccitt(0) iso(1) joint-iso-ccitt(2) org(3) internet(1) dod(6) mgmt(2) mib-2(1) experimental(3) private(4) enterprise(1) internet OBJECT IDENTIFIER ::= { iso(1) org(3) dod(6) 1 } private OBJECT IDENTIFIER ::= { internet 4 } A. Steffen, , KSy_ASN1.ppt 10 Hierarchical Tree Structure ASN.1 object identifiers are organized in a hierarchical tree structure to make it possible to give any object a unique global identifier. SNMP Objects The official SNMP objects defined by various RFCs are attached below the node { iso(1) org(3) dod( 6) internet(2) mgmt(1) } Enterprise specific SNMP objects are attached below the node { iso(1) org(3) dod( 6) internet(2) private(4) enterprise(1) } SNMP OIDs of some well-known enterprises IBM: { enterprises 2 } Cisco: { enterprises 9 } Hewlett-Packard: { enterprises 11 } Sun Microsystems: { enterprises 42 } Microsoft: { enterprises 311 } Intel: { enterprises 343 } Security OIDs of some well-known enterprises Sun Microsystems: { iso(1) member-body(2) US(840) } RSA Data Security Inc: { iso(1) member-body(2) US(840) } Microsoft: { iso(1) member-body(2) US(840) } Netscape: { joint-iso-ccitt (2) country (16) usa (840) org (1) } Verisign: { joint-iso-ccitt (2) country (16) usa (840) org (1) } Intel: { joint-iso-ccitt (2) country (16) usa (840) org (1) }
11 ASN.1 Structured Types I SEQUENCE Use: Collection of a moderate number of variables that may be of different type and whose order is significant. Type Definition: UserAccount ::= SEQUENCE { username VisibleString, password VisibleString, accountnr INTEGER } Value Assignment: myaccount UserAccount ::= { username "steffen", password "jane51", accountnr 4711 } A. Steffen, , KSy_ASN1.ppt 11
12 ASN.1 Structured Types II SEQUENCE OF Use: Collection of a large number of variables of the same type and whose order is significant. Type Definition: MemberCountries ::= SEQUENCE OF VisibleString AccountRegistry ::= SEQUENCE OF UserAccount Value Assignment: eumembers MemberCountries ::= { "Austria", "Belgium", "Denmark", "Finland", "France", "Germany", "Greece", "Ireland", "Italy", "Luxembourg", "The Netherlands", "Portugal", "Spain", "Sweden", "United Kingdom"} A. Steffen, , KSy_ASN1.ppt 12
13 ASN.1 Structured Types III SET Use: Collection of a moderate number of variables that may be of different type and whose order is insignificant. Type Definition: UserAccount ::= SET { username [0] VisibleString, context-specific tags password [1] VisibleString, or automatic tagging accountnr [2] INTEGER } Value Assignment: myaccount UserAccount ::= { accountnr 4711, username "steffen", password "jane51" } A. Steffen, , KSy_ASN1.ppt 13 Context-Specific Tags Since they can occur in arbitrary order, the members of a set need tags in order to uniquely identify them. Tags can either be defined explicitly by the system designer or are assigned automatically by the ASN.1 parser if the automatic tagging option is used.
14 ASN.1 Structured Types IV SET OF Use: Collection of variables that are the same type and whose order is insignificant. Type Definition: Keywords ::= SET OF VisibleString Value Assignment: someasn1keywords Keywords ::= {"INTEGER", "BOOLEAN", "REAL"} A. Steffen, , KSy_ASN1.ppt 14
15 Kommunikationssysteme (KSy) - Block 7 Basic Encoding Rules of ASN.1 BER A. Steffen, , KSy_ASN1.ppt 15
16 General Encoding Rule for ASN.1 Values Type - Length - Value Identifier Field Length Field Contents Field 1. Primitive, definite-length encoding simple types 2. Constructed, definite-length encoding structured types (SEQUENCE[OF], SET[OF]) 3. Constructed, indefinite-length encoding structured types (SEQUENCE[OF], SET[OF]) A. Steffen, , KSy_ASN1.ppt 16
17 ASN.1 Type Tags I Universal Class Tags UNIVERSAL 1 BOOLEAN UNIVERSAL 2 -UNIVERSAL basic types 3 BIT STRING UNIVERSAL 4 UNIVERSAL 9 REAL UNIVERSAL 10 INTEGER OCTET STRING ENUMERATED UNIVERSAL 6 - object types UNIVERSAL 7 - character string types UNIVERSAL 5 NULL -UNIVERSAL miscellaneous 23 UTCTime types - structured types OBJECT IDENTIFIER ObjectDescriptor UNIVERSAL 26 VisibleString... UNIVERSAL 24 GeneralizedTime UNIVERSAL 16 SEQUENCE [OF] UNIVERSAL 17 SET [OF] A. Steffen, , KSy_ASN1.ppt 17
18 ASN.1 Type Tags II Application Class Tags Explicit Tagging: (strong type checking) IpAddress ::= [APPLICATION 0] OCTET STRING (SIZE(4)) Counter ::= [APPLICATION 1] INTEGER ( ) Implicit Tagging: (shorter encoding) IpAddress ::= [APPLICATION 0] IMPLICIT -- RFC 1155 OCTET STRING (SIZE(4)) Counter ::= [APPLICATION 1] IMPLICIT -- RFC 1155 INTEGER ( ) A. Steffen, , KSy_ASN1.ppt 18
![.4294967295) Implicit Tagging: (shorter encoding) IpAddress ::= [APPLICATION 0] IMPLICIT -- RFC 1155](/docs-images/46/21493195/images/page_18.jpg "OCTET STRING (SIZE(4)) Counter ::= [APPLICATION 1] IMPLICIT -- RFC 1155 INTEGER (0..4294967295) A.")
19 BER Encoding of Identifier Field I Tag numbers < 31 Identifier Octet Bits Class P/C Tag number 0 = Primitive 1 = Constructed 0 0 = Universal 0 1 = Application 1 0 = Context-specific 1 1 = Private A. Steffen, , KSy_ASN1.ppt 19
20 BER Encoding of Identifier Field II Tag numbers 31 Leading octet 2nd octet Last octet Class P/C = Tag number A. Steffen, , KSy_ASN1.ppt 20
21 BER Encoding of Length Field Short definite form ( L < 128 octets) one octet L octets 0 Length L Contents field Long definite form ( 128 L < octets) first octet K octets L octets 1 K Length L Contents field Indefinite form; content field terminated by EOC one octet two octets Contents field EOC '0000'H A. Steffen, , KSy_ASN1.ppt 21 Short definite form Used either for primitive or constructed types with content lengths smaller than 128 octets. Long definite form Used either for primitive or constructed types with content lengths usually equal or greater than 128 octets. Indefinite form Used for constructed types only. The end-of-contents octets (EOC) can be considered as the encoding of a value whose tag is universal class, whose form is primitive, whose tag number is zero, and whose contents are absent, i.e. it has zero length.
22 BER Encoding Examples I INTEGER Type Length Value yesterday INTEGER ::= F today INTEGER ::= two s complement UNIVERSAL P 2 DayOfYear ::= [APPLICATION 17] IMPLICIT INTEGER today DayOfYear ::= APPLICATION P 17 A. Steffen, , KSy_ASN1.ppt 22 BER coding of two s complement integers -129: = FF 7F -128: = : = : = FF 0: = : = : = F 128: = : =
23 BER Encoding Examples II SEQUENCE Birthday ::= SEQUENCE { name VisibleString, day DayOfYear } mybirthday Birthday ::= { name "Jane", day 128 } UNIVERSAL Type Definition Value Assignment Birthday Length Contents BER Encoding 30?? 0A VisibleString Length Contents 1A 04 "Jane" DayOfYear Length Contents A. Steffen, , KSy_ASN1.ppt 23
24 BER Encoding Examples III OBJECT IDENTIFIER enterprise OBJECT IDENTIFIER ::= {iso(1) org(3) dod(6) internet(1) private(4) 1} X Y Z = 40 X + Y B A. Steffen, , KSy_ASN1.ppt 24 Coding of OID Root ccitt(0): Z = Y { 0..39} iso(1): Z = 40 + Y {40..79} joint-isi-ccitt(2): Z = 80 + Y { } Coding of OID node numbers Similar coding as tag numbers in identifier field Range {0..127}: 0xxx xxxx Range { }: 1xxx xxxx 0xxx xxxx Range { }: 1xxx xxxx 1xxx xxxx 0xxx xxxx
25 Alternative Encoding Rules Packed Encoding Rules (PER) Very compressed encoding based on ASN.1 subtype information. Example: subtype INTEGER ( ) is encoded using two bits only. Used e.g. in H.323 multimediastandard. Distinguished Encoding Rules (DER) Subset of BER that gives exactly one way to represent any ASN.1 value. Used e.g. in X.509 certificates where computation of digital hash sums must be unique. Uses definite-length encoding. Canonical Encoding Rules (CER) Subset of BER that gives exactly one way to represent any ASN.1 value but based on indefinite-length encoding. A. Steffen, , KSy_ASN1.ppt 25
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