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81 lines
2.5 KiB
Plaintext
81 lines
2.5 KiB
Plaintext
:: |asn1: small selection of types and constants for ASN.1
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::
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:: A minimal representation of some basic ASN.1 types,
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:: created to support PKCS keys, digests, and cert requests.
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::
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^?
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|%
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:: +bespoke:asn1: context-specific, generic ASN.1 tag type
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::
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:: Note that *explicit* implies *constructed* (ie, bit 5 is set in DER).
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::
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+= bespoke
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:: imp: & is implicit, | is explicit
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:: tag: 5 bits for the custom tag number
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::
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[imp=? tag=@ud]
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:: +spec:asn1: minimal representations of basic ASN.1 types
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::
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+= spec
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$% :: %int: arbitrary-sized, unsigned integers
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::
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:: Unsigned integers, represented as having a positive sign.
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:: Negative integers would be two's complement in DER,
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:: but we don't need them.
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::
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[%int int=@u]
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:: %bit: very minimal support for bit strings
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::
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:: Specifically, values must already be padded and byte-aligned.
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:: len: bitwidth
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:: bit: data
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::
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[%bit len=@ud bit=@ux]
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:: %oct: octets in little-endian byte order
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::
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:: len: bytewidth
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:: bit: data
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::
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[%oct len=@ud oct=@ux]
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:: %nul: fully supported!
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::
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[%nul ~]
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:: %obj: object identifiers, pre-packed
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::
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:: Object identifiers are technically a sequence of integers,
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:: represented here in their already-encoded form.
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::
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[%obj obj=@ux]
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:: %seq: a list of specs
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::
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[%seq seq=(list spec)]
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:: %set: a logical set of specs
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::
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:: Implemented here as a list for the sake of simplicity.
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:: must be already deduplicated and sorted!
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::
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[%set set=(list spec)]
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:: %con: context-specific
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::
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:: General support for context-specific tags.
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:: bes: custom tag number, implicit or explicit
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:: con: already-encoded bytes
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::
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[%con bes=bespoke con=(list @D)]
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==
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:: |obj:asn1: constant object ids, pre-encoded
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::
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++ obj
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^?
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|% :: rfc4055
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++ sha-256 0x1.0204.0365.0148.8660 :: 2.16.840.1.101.3.4.2.1
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++ rsa 0x1.0101.0df7.8648.862a :: 1.2.840.113549.1.1.1
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++ rsa-sha-256 0xb.0101.0df7.8648.862a :: 1.2.840.113549.1.1.11
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:: rfc2985
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++ csr-ext 0xe.0901.0df7.8648.862a :: 1.2.840.113549.1.9.14
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:: rfc3280
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++ sub-alt 0x11.1d55 :: 2.5.29.17
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--
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--
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