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The three AttributeValueAssertion values are SEQUENCE values, so their DER encodings follow the constructed, definite-length method:
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30 09 06 03 55 04 06 13 02 55 53 countryName US
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30 1b organizationName 06 03 55 04 0a 1 3 14 . . . 6f 6e 30 12 06 03 55 04 0b 13 0b ... 20 31 commonName
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Example Organization
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Test User 1
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The identifier octets follow the low-tag-number form, since the tag for SEQUENCE, 16 (decimal), is between 0 and 30. Bits 8 and 7 have value 0 since SEQUENCE is in the universal class. Bit 6 has value 1 since the encoding is constructed. The length octets follow the short form, and the contents octets are the concatenation of the DER encodings of the attributeType and attributeValue components.
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A Layman s Guide to a Subset of ASN.1, BER, and DER
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RelativeDistinguishedName
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The three RelativeDistinguishedName values are SET OF values, so their DER encodings follow the constructed, definite-length method:
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31 0b 30 09 ... 55 53 31 1d 30 1b ... 6f 6e 31 14 30 12
20 31
The identifier octets follow the low-tag-number form, since the tag for SET OF, 17 (decimal), is between 0 and 30. Bits 8 and 7 have value 0 since SET OF is in the universal class. Bit 6 has value 1 since the encoding is constructed. The length octets follow the short form, and the contents octets are the DER encodings of the respective AttributeValueAssertion values, since there is only one value in each set.
RDNSequence
The RDNSequence value is a SEQUENCE OF value, so its DER encoding follows the constructed, definite-length method:
30 42 31 0b ... 55 53 31 1d ... 6f 6e 31 14 ... 20 31
The identifier octets follow the low-tag-number form, since the tag for SEQUENCE OF, 16 (decimal), is between 0 and 30. Bits 8 and 7 have value 0 since SEQUENCE OF is in the universal class. Bit 6 has value 1 since the encoding is constructed. The length octets follow the short form, and the contents octets are the concatenation of the DER encodings of the three RelativeDistinguishedName values, in order of occurrence.
Appendix B
Name
The Name value is a CHOICE value, so its DER encoding is the same as that of the RDNSequence value:
30 42 31 0b 30 09 06 13 31 1d 30 1b 06 13
03 55 04 06 02 55 53
attributeType = countryName attributeValue = "US"
03 55 04 0a attributeType = organizationName 14 attributeValue = "Example Organization" 45 78 61 6d 70 6c 65 20 4f 72 67 61 6e 69 7a 61 74 69 6f 6e
31 14 30 12 06 03 55 04 03 attributeType = commonName 13 0b attributeValue = "Test User 1" 54 65 73 74 20 55 73 65 72 20 31
References
PKCS #1 PKCS #3 PKCS #5 PKCS #6 PKCS #7 PKCS #8 PKCS #9 PKCS #10 X.200 RSA Laboratories. PKCS #1: RSA Encryption Standard. Version 1.5, November 1993. RSA Laboratories. PKCS #3: Diffie-Hellman Key-Agreement Standard. Version 1.4, November 1993. RSA Laboratories. PKCS #5: Password-Based Encryption Standard. Version 1.5, November 1993. RSA Laboratories. PKCS #6: Extended-Certificate Syntax Standard. Version 1.5, November 1993. RSA Laboratories. PKCS #7: Cryptographic Message Syntax Standard. Version 1.5, November 1993. RSA Laboratories. PKCS #8: Private-Key Information Syntax Standard. Version 1.2, November 1993. RSA Laboratories. PKCS #9: Selected Attribute Types. Version 1.1, November 1993. RSA Laboratories. PKCS #10: Certification Request Syntax Standard. Version 1.0, November 1993. CCITT. Recommendation X.200: Reference Model of Open Systems Interconnection for CCITT Applications. 1984.
A Layman s Guide to a Subset of ASN.1, BER, and DER
X.208 X.209
X.500 X.501 X.509 X.520 [Kal93] [NIST92]
CCITT. Recommendation X.208: Specification of Abstract Syntax Notation One (ASN.1). 1988. CCITT. Recommendation X.209: Specification of Basic Encoding Rules for Abstract Syntax Notation One (ASN.1). 1988. CCITT. Recommendation X.500: The Directory Overview of Concepts, Models and Services. 1988. CCITT. Recommendation X.501: The Directory Models. 1988. CCITT. Recommendation X.509: The Directory Authentication Framework. 1988. CCITT. Recommendation X.520: The Directory Selected Attribute Types. 1988. Burton S. Kaliski Jr. Some Examples of the PKCS Standards. RSA Laboratories, November 1993. NIST. Special Publication 500-202: Stable Implementation Agreements for Open Systems Interconnection Protocols. Part 11 (Directory Services Protocols). December 1992.
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