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Fix ECDSA DER signature detection

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Mononaut 2023-12-13 16:15:55 +00:00
parent c019355c9f
commit ce195c9133
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1 changed files with 2 additions and 2 deletions
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4
backend/src/api/common.ts
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@ -171,8 +171,8 @@ export class Common {
// heuristic to detect probable DER signatures
return (w.length >= 18
&& w.startsWith('30') // minimum DER signature length is 8 bytes + sighash flag (see https://mempool.space/testnet/tx/c6c232a36395fa338da458b86ff1327395a9afc28c5d2daa4273e410089fd433)
&& ['01, 02, 03, 81, 82, 83'].includes(w.slice(-2)) // signature must end with a valid sighash flag
&& (w.length === parseInt(w.slice(2, 4), 16) + 6) // second byte encodes the combined length of the R and S components
&& ['01', '02', '03', '81', '82', '83'].includes(w.slice(-2)) // signature must end with a valid sighash flag
&& (w.length === (2 * parseInt(w.slice(2, 4), 16)) + 6) // second byte encodes the combined length of the R and S components
);
}