Parses a definite-length binary artifact and returns every ASN.1 object it contains with its byte offset, nesting depth, header and content lengths, whether it is constructed, and the type as OpenSSL names it. This is the tool for the moment a certificate, key or signature is rejected with an unhelpful parse error and the question is which byte is wrong. Because offsets are exact, a diff against a known-good artifact localises the difference instead of describing it.

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