arnaucube/blindsecp256k1-js
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Add even hex length before hashing 'm' for Go comp

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arnaucube
2021-02-11 23:14:28 +01:00
parent 049c0b58c8
commit 488b33e08a
4 changed files with 1205 additions and 9 deletions
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10
src/index.ts
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@@ -93,8 +93,9 @@ export function blind(m: BigInteger, signerR: Point): { mBlinded: BigInteger, us
const ainvrx = ainv.multiply(rx)
const mHex = m.toString(16)
const hHex = keccak256('0x' + zeroPad(mHex, 32)).substr(2)
const hHex = keccak256('0x' + evenHex(mHex)).substr(2)
const h = BigInteger.fromHex(hHex)
const mBlinded = ainvrx.multiply(h)
return { mBlinded: mBlinded.mod(n), userSecretData: u }
@@ -121,7 +122,7 @@ export function verify(m: BigInteger, s: UnblindedSignature, q: Point) {
const sG = G.multiply(s.s)
const mHex = m.toString(16)
const hHex = keccak256('0x' + zeroPad(mHex, 32)).substr(2)
const hHex = keccak256('0x' + evenHex(mHex)).substr(2)
const h = BigInteger.fromHex(hHex)
const rx = s.f.affineX.mod(n)
@@ -148,9 +149,8 @@ function random(bytes: number) {
return k
}
function zeroPad(hexString: string, byteLength: number) {
if (hexString.length > (byteLength * 2)) throw new Error("Out of bounds")
while (hexString.length < (byteLength * 2)) {
export function evenHex(hexString: string) {
if ((hexString.length % 2) != 0) {
hexString = "0" + hexString
}
return hexString