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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 IA5String value test1@rsa.com is
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16 0d 74 65 73 74 31 40 72 73 61 2e 63 6f 6d
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Section 5.7: INTEGER
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The INTEGER type denotes an arbitrary integer. INTEGER values can be positive, negative, or zero, and can have any magnitude. The INTEGER type is used for version numbers throughout PKCS, for
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Appendix B
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cryptographic values such as modulus, exponent, and primes in PKCS #1 s RSAPublicKey and RSAPrivateKey types and PKCS #3 s DHParameter type, for a message-digest iteration count in PKCS #5 s PBEParameter type, and for version numbers and serial numbers in X.509 s Certificate type.
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ASN.1 Notation
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INTEGER [{ identifier1(value1) ... identifiern(valuen) }]
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where identifier1, . . ., identifiern are optional distinct identifiers and value1, . . ., valuen are optional integer values. The identifiers, when present, are associated with values of the type.
Example X.509 s Version type is an INTEGER type with identified val-
ues:
Version ::= INTEGER { v1988(0) }
The identifier v1988 is associated with the value 0. X.509 s Certificate type uses the identifier v1988 to give a default value of 0 for the version component:
Certificate ::= ... version Version DEFAULT v1988, ...
BER Encoding
Primitive. Contents octets give the value of the integer, base 256, in two s complement form, most significant digit first, with the minimum number of octets. The value 0 is encoded as a single 00 octet. Some example BER encodings (which also happen to be DER encodings) are given in Table B-3.
DER Encoding
Primitive. Contents octets are as for a primitive BER encoding.
A Layman s Guide to a Subset of ASN.1, BER, and DER
Table B-3 Example BER Encodings of INTEGER Values
Integer Value 0 127 128 256 -128 -129 BER Encoding 02 01 00 02 01 7F 02 02 00 80 02 02 01 00 02 01 80 02 02 FF 7F
Section 5.8: NULL
The NULL type denotes a null value. The NULL type is used for algorithm parameters in several places in PKCS.
ASN.1 Notation
NULL
BER Encoding
Primitive. Contents octets are empty.
Example The BER encoding of a NULL value can be either of the follow-
ing, as well as others, depending on the form of the length octets:
05 00 05 81 00
DER Encoding
Primitive. Contents octets are empty; the DER encoding of a NULL value is always 05 00.
Appendix B
Section 5.9: 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. This type is a nonstring type. OBJECT IDENTIFIER values are given meanings by registration authorities. Each registration authority is responsible for all sequences of components beginning with a given sequence. A registration authority typically delegates responsibility for subsets of the sequences in its domain to other registration authorities, or for particular types of objects. There are always at least two components. The OBJECT IDENTIFIER type is used to identify content in PKCS #7 s ContentInfo type, to identify algorithms in X.509 s AlgorithmIdentifier type, and to identify attributes in X.501 s Attribute and AttributeValueAssertion types. The Attribute type is used by PKCS #6, #7, #8, #9, and #10, and the AttributeValueAssertion type is used in X.501 distinguished names. OBJECT IDENTIFIER values are defined throughout PKCS.
ASN.1 Notation
OBJECT IDENTIFIER
The ASN.1 notation for values of the OBJECT IDENTIFIER type is
{ [identifier] component1 ... componentn } componenti = identifieri | identifieri (valuei) | valuei
where identifier, identifier1, . . ., identifiern are identifiers, and value1, . . ., valuen are optional integer values. The form without identifier is the complete value with all its components; the form with identifier abbreviates the beginning components with another object identifier value. The identifiers identifier1, . . ., identifiern are intended primarily for documentation, but they must correspond to the integer value when both are present. These identifiers can appear without integer values only if they are among a small set of identifiers defined in X.208.
AM FL Y
A Layman s Guide to a Subset of ASN.1, BER, and DER
Example Both of the following values refer to the object identifier
assigned to RSA Data Security, Inc.:
{ iso(1) member-body(2) 840 113549 } { 1 2 840 113549 }
(In this example, which gives ASN.1 value notation, the object identifier values are decimal, not hexadecimal.) Table A-4 gives some other object identifier values and their meanings.
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