ASN.1 tag lengths > 1-byte are not supported (#8)

mdehoog · web-flow · commit cbb9982b63ab · 2025-01-10T16:14:21.000-10:00
diff --git a/src/Asn1Decode.sol b/src/Asn1Decode.sol
@@ -209,6 +209,7 @@ library Asn1Decode {
     }
 
     function readNodeLength(bytes memory der, uint256 ix) private pure returns (Asn1Ptr) {
+        require(der[ix] & 0x1f != 0x1f, "ASN.1 tags longer than 1-byte are not supported");
         uint256 length;
         uint80 ixFirstContentByte;
         if ((der[ix + 1] & 0x80) == 0) {

Original file line number	Diff line number	Diff line change
`@@ -209,6 +209,7 @@ library Asn1Decode {`
`209`	`209`	`}`
`210`	`210`
`211`	`211`	`function readNodeLength(bytes memory der, uint256 ix) private pure returns (Asn1Ptr) {`
	`212`	`+ require(der[ix] & 0x1f != 0x1f, "ASN.1 tags longer than 1-byte are not supported");`
`212`	`213`	`uint256 length;`
`213`	`214`	`uint80 ixFirstContentByte;`
`214`	`215`	`if ((der[ix + 1] & 0x80) == 0) {`