vb.net barcode scanner webcam B-4 Some Object Identifier Values and Their Meanings in Software

Printer Code 39 Full ASCII in Software B-4 Some Object Identifier Values and Their Meanings

Table B-4 Some Object Identifier Values and Their Meanings
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Object Identifier Value {12} { 1 2 840 } { 1 2 840 113549 } { 1 2 840 113549 1 } {25} {258}
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Meaning ISO member bodies US (ANSI) RSA Data Security, Inc. RSA Data Security, Inc. PKCS Directory services (X.500) Directory services algorithms
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BER Encoding
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Primitive. Contents octets are as follows, where value1, . . ., valuen denote the integer values of the components in the complete object identifier: 1. The first octet has value 40 value1 value2. (This is unambiguous, since value1 is limited to values 0, 1, and 2; value2 is limited to the range 0 to 39 when value1 is 0 or 1; and, according to X.208, n is always at least 2.) 2. The following octets, if any, encode value3, . . ., valuen. Each value is encoded base 128, most significant digit first, with as few digits as possible, and the most significant bit of each octet except the last in the value s encoding set to 1.
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Appendix B
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Example The first octet of the BER encoding of RSA Data Security, Inc. s
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object identifier is 40 1 2 42 2a16. The encoding of 840 6 128 4816 is 86 48, and the encoding of 113549 6 1282 7716 128 d16 is 86 f7 0d. This leads to the following BER encoding:
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06 06 2a 86 48 86 f7 0d
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DER Encoding
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Primitive. Contents octets are as for a primitive BER encoding.
Section 5.10: OCTET STRING
The OCTET STRING type denotes an arbitrary string of octets (eight-bit values). An OCTET STRING value can have any length, including zero. This type is a string type. The OCTET STRING type is used for salt values in PKCS #5 s PBE Parameter type, for message digests, encrypted message digests, and encrypted content in PKCS #7, and for private keys and encrypted private keys in PKCS #8.
ASN.1 Notation
OCTET STRING [SIZE ({size | size1..size2})]
where size, size1, and size2 are optional size constraints. In the OCTET STRING SIZE (size) form, the octet string must have size octets. In the OCTET STRING SIZE (size1..size2) form, the octet string must have between size1 and size2 octets. In the OCTET STRING form, the octet string can have any size.
Example PKCS #5 s PBEParameter type has a component of type OCTET
STRING:
PBEParameter ::= SEQUENCE { salt OCTET STRING SIZE(8), iterationCount INTEGER }
Here the size of the salt component is always eight octets.
A Layman s Guide to a Subset of ASN.1, BER, and DER
BER Encoding
Primitive or constructed. In a primitive encoding, the contents octets give the value of the octet string, first octet to last octet. In a constructed encoding, the contents octets give the concatenation of the BER encodings of substrings of the OCTET STRING value.
Example The BER encoding of the OCTET STRING value 01 23 45 67
89 ab cd ef can be any of the following, among others, depending on the form of length octets and whether the encoding is primitive or constructed:
04 08 01 23 45 67 89 ab cd ef 04 81 08 01 23 45 67 89 ab cd ef 24 0c 04 04 01 23 45 67 04 04 89 ab cd ef DER encoding Long form of length octets Constructed encoding: 01 . . . 67 89 . . . ef
DER Encoding
Primitive. Contents octets are as for a primitive BER encoding.
Example The BER encoding of the OCTET STRING value 01 23 45 67
89 ab cd ef is
04 08 01 23 45 67 89 ab cd ef
Section 5.11: PrintableString
The PrintableString type denotes an arbitrary string of printable characters from the following character set:
A, B, ..., Z a, b, ..., z 0, 1, ..., 9 (space) ' ( ) + , - . / : =
This type is a string type. The PrintableString type is used in PKCS #9 s challenge-password and unstructured-address attributes, and in several X.521 distinguished names attributes.
Appendix B
ASN.1 Notation
PrintableString
BER Encoding
Primitive or constructed. In a primitive encoding, the contents octets give the characters in the printable string, encoded in ASCII. In a constructed encoding, the contents octets give the concatenation of the BER encodings of consecutive substrings of the string.
Example The BER encoding of the PrintableString value Test
User 1 can be any of the following, among others, depending on the form of length octets and whether the encoding is primitive or constructed:
13 0b 54 65 73 74 20 55 73 65 72 20 31 13 81 0b 54 65 73 74 20 55 73 65 72 20 31 33 0f 13 05 54 65 73 74 20 13 06 55 73 65 72 20 31 DER encoding Long form of length octets Constructed encoding: Test User 1
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