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describe behavior of the flexi decoder on unknown identifiers

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Steffen Jaeckel 2014-10-09 22:43:30 +02:00
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crypt.tex
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@ -5075,6 +5075,13 @@ normally. The decoded list \textit{out} will point to the very first element of
An invalid decoding will terminate the process, and free the allocated memory automatically.
The flexi decoder calls itself when decoding a constructed type. This leads to
a 'child process' that will terminate when it decodes an unkown/invalid
identifier and leaves an allocated but uninitialized child element.
However the parent processing will continue with a "soft-error".
This can be detected by checking for \textit{child} elements with
type \textbf{LTC\_ASN1\_EOL} after decoding.
As of v1.18 the flexi decoder will also decode arbitrary constructed types
other than SEQUENCE and SET. The \textit{type} field will be set to
\textbf{LTC\_ASN1\_CONSTRUCTED} and the plain identifier that was indicated in the ASN.1