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signature = ecdsa_sign(txHash, privateKey);
// enforce a low S
curveOrder = ecdsa_get_order(secp256k1Group);
halfCurveOrder = curveOrder / 2; // actual division done with openssl's right shift BIGNUM function as well as comparison and subtraction operations below
if (signature->s > halfCurveOrder)
{
signature->s = curveOrder - signature->s;
}
// check for LSBit of the MSByte for R
if (signature->r[0] >= 128)
{
signature->r = 0x00 + signature->r; // appending by having a new buffer memcpy(buff, &zero, 1); memcpy(buff + 1, rBuffer, rLength)
}
// the same check/appending done for S -- with this Im not sure it needs to be done since I should have a low S already??
// ...
return <30><4 + rLength + sLength><02><02>
Pair (r, s);
do
{
(r, s) = sign(hash, pvtkey);
} while (r[0] >= 128 || s[0] >= 128); // where r[0], s[0] should be the very first byte of each value
openssl ecparam -genkey -name secp256k1 -rand /dev/urandom -out $PRIVATE_KEY
openssl ec -in $PRIVATE_KEY -pubout -out $PUBLIC_KEY
openssl ecparam -genkey -name secp256k1 -rand /dev/urandom -out $PRIVATE_KEY
openssl ec -in $PRIVATE_KEY -pubout -out $PUBLIC_KEY
REJECT_NONSTANDARD
Pair (r, s);
do
{
(r, s) = sign(hash, pvtkey);
} while (r[0] >= 128 || s[0] >= 128); // where r[0], s[0] should be the very first byte of each value