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Add low R grinding option

lowR
junderw 6 years ago
parent
commit
3b402d00c6
No known key found for this signature in database GPG Key ID: B256185D3A971908
  1. 19
      src/ecpair.js
  2. 18
      ts_src/ecpair.ts
  3. 2
      types/ecpair.d.ts

19
src/ecpair.js

@ -35,10 +35,25 @@ class ECPair {
throw new Error('Missing private key');
return wif.encode(this.network.wif, this.__D, this.compressed);
}
sign(hash) {
sign(hash, lowR = false) {
if (!this.__D)
throw new Error('Missing private key');
return ecc.sign(hash, this.__D);
if (lowR === false) {
return ecc.sign(hash, this.__D);
}
else {
let sig = ecc.sign(hash, this.__D);
const extraData = Buffer.alloc(32, 0);
let counter = 0;
// if first try is lowR, skip the loop
// for second try and on, add extra entropy counting up
while (sig[0] > 0x7f) {
counter++;
extraData.writeUIntLE(counter, 0, 6);
sig = ecc.signWithEntropy(hash, this.__D, extraData);
}
return sig;
}
}
verify(hash, signature) {
return ecc.verify(hash, this.publicKey, signature);

18
ts_src/ecpair.ts

@ -61,9 +61,23 @@ class ECPair implements ECPairInterface {
return wif.encode(this.network.wif, this.__D, this.compressed);
}
sign(hash: Buffer): Buffer {
sign(hash: Buffer, lowR: boolean = false): Buffer {
if (!this.__D) throw new Error('Missing private key');
return ecc.sign(hash, this.__D);
if (lowR === false) {
return ecc.sign(hash, this.__D);
} else {
let sig = ecc.sign(hash, this.__D);
const extraData = Buffer.alloc(32, 0);
let counter = 0;
// if first try is lowR, skip the loop
// for second try and on, add extra entropy counting up
while (sig[0] > 0x7f) {
counter++;
extraData.writeUIntLE(counter, 0, 6);
sig = ecc.signWithEntropy(hash, this.__D, extraData);
}
return sig;
}
}
verify(hash: Buffer, signature: Buffer): Buffer {

2
types/ecpair.d.ts

@ -24,7 +24,7 @@ declare class ECPair implements ECPairInterface {
readonly privateKey: Buffer | undefined;
readonly publicKey: Buffer | undefined;
toWIF(): string;
sign(hash: Buffer): Buffer;
sign(hash: Buffer, lowR?: boolean): Buffer;
verify(hash: Buffer, signature: Buffer): Buffer;
}
declare function fromPrivateKey(buffer: Buffer, options?: ECPairOptions): ECPair;

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