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Disabled nested type recursion for implicitly tagged types #14

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Merged
Crypt32 merged 1 commit into from
Aug 1, 2024
Merged

Disabled nested type recursion for implicitly tagged types #14

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11 changes: 7 additions & 4 deletions Asn1Parser/Asn1Reader.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -169,10 +169,13 @@ void decode(Byte[] raw, Int32 pOffset) {
}
void parseNestedType() {
// processing rules (assuming zero-based bits):
// if bit 5 is set to "1", or the type is SEQUENCE/SET -- the type is constructed. Unroll nested types.
// if bit 5 is set to "0", attempt to resolve nested types only for UNIVERSAL tags.
// some universal types cannot include nested types: skip them in advance.
if (_excludedTags.Contains(Tag) || PayloadLength < 2) { return; }
// -- if bit 5 is set to "1", or the type is SEQUENCE/SET -- the type is constructed. Unroll nested types.
// -- if bit 5 is set to "0", attempt to resolve nested types only for UNIVERSAL tags.
// -- if the value is implicitly tagged, it cannot contain nested types.
// -- some universal types cannot include nested types: skip them in advance.
if (_excludedTags.Contains(Tag) || PayloadLength < 2 || Tag > 127 & Tag < 160) {
return;
}
Int64 start = PayloadStartOffset;
Int32 length = PayloadLength;
// BIT_STRING includes "unused bits" octet, do not count it in calculations
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