为什么eos签名不需要判断r和s的长度

[vae520283995]

var der, e, ecsignature, i, lenR, lenS, nonce;
i = null;
nonce = 0;
e = BigInteger.fromBuffer(dataSha256);
while (true) {
ecsignature = ecdsa.sign(curve, dataSha256, privateKey.d, nonce++);
der = ecsignature.toDER();
lenR = der[3];
lenS = der[5 + lenR];
if (lenR === 32 && lenS === 32) {
i = ecdsa.calcPubKeyRecoveryParam(curve, e, ecsignature, privateKey.toPublic().Q);
i += 4; // compressed
i += 27; // compact // 24 or 27 :( forcing odd-y 2nd key candidate)
break;
}
if (nonce % 10 === 0) {
console.log("WARN: " + nonce + " attempts to find canonical signature");
}
}

eosjc-ecc 里面需要r和s都是32字节