Hi Steven and others, i have a doubt regd these tags in ASN1: when do we use implicit tags & when do we use explicit tags?
i have read the 'layman's guide to a subset of ASN.1, BER & DER' but it seems i didn't get the exact difference b/n the two types of tags - in the sense of exact context in which each of these types of tags are used.
bye & thnx - sravan Steven Reddie wrote:
I should clarify that tags aren't blindly used to identify members of structured types, only when there would otherwise be ambiguity such as with optional members in a SEQUENCE, or in a CHOICE. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Steven Reddie Sent: Thursday, 8 September 2005 11:07 AM To: openssl-users@openssl.org Subject: RE: OCSP, Nonce and the requestExtensions Do a search for a document titled "A Layman's Guide to a Subset of ASN.1, BER, and DER". The tags in this case, and generally, are used to identify the components in the structure. Since the last two members are optional it is necessary to encode the structure so that it is possible to tell which of the optional components is present. I don't know why the version has an explicit tag -- it seems redundant.
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