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Throw error on parsing multi-octet tag number smaller with tag number 31 #60

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Throw error on parsing multi-octet tag number smaller with tag number 31 #60

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3 changes: 3 additions & 0 deletions asn1.js
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Original file line number Diff line number Diff line change
Expand Up @@ -522,6 +522,9 @@ function ASN1Tag(stream) {
n.mulAdd(128, buf & 0x7F);
} while (buf & 0x80);
this.tagNumber = n.simplify();
if (this.tagNumber < 0x1F) {
throw 'Tag number ' + this.tagNumber + ' is smaller than 31, so it shall not use multi octet tag format';
}
}
}
ASN1Tag.prototype.isUniversal = function () {
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