der: add IndefiniteLength type
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Per #823 and #827, making PKCS#7 work interoperably will involve supporting at limited number of BER productions, one of which is indefinite lengths. The current built-in `Length` type rejects them, as a proper DER parser is expected to. This commit adds a separate `IndefiniteLength` type as a newtype of `Option<Length>` with support for parsing indefinite lengths.
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Per #823 and #827, making PKCS#7 work interoperably will involve supporting at limited number of BER productions, one of which is indefinite lengths.
The current built-in
Lengthtype rejects them, as a proper DER parser is expected to.This commit adds a separate
IndefiniteLengthtype as a newtype ofOption<Length>with support for parsing indefinite lengths.