ethers.js/lib.esm/crypto/signing-key.js

import * as secp256k1 from "@noble/secp256k1";
import { concat, dataLength, getBytes, getBytesCopy, hexlify, toHex, assertArgument } from "../utils/index.js";
import { computeHmac } from "./hmac.js";
import { Signature } from "./signature.js";
//const N = BigInt("0xfffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141");
// Make noble-secp256k1 sync
secp256k1.utils.hmacSha256Sync = function (key, ...messages) {
    return getBytes(computeHmac("sha256", key, concat(messages)));
};
export class SigningKey {
    #privateKey;
    constructor(privateKey) {
        assertArgument(dataLength(privateKey) === 32, "invalid private key", "privateKey", "[REDACTED]");
        this.#privateKey = hexlify(privateKey);
    }
    get privateKey() { return this.#privateKey; }
    get publicKey() { return SigningKey.computePublicKey(this.#privateKey); }
    get compressedPublicKey() { return SigningKey.computePublicKey(this.#privateKey, true); }
    sign(digest) {
        assertArgument(dataLength(digest) === 32, "invalid digest length", "digest", digest);
        const [sigDer, recid] = secp256k1.signSync(getBytesCopy(digest), getBytesCopy(this.#privateKey), {
            recovered: true,
            canonical: true
        });
        const sig = secp256k1.Signature.fromHex(sigDer);
        return Signature.from({
            r: toHex("0x" + sig.r.toString(16), 32),
            s: toHex("0x" + sig.s.toString(16), 32),
            v: (recid ? 0x1c : 0x1b)
        });
    }
    computeShardSecret(other) {
        const pubKey = SigningKey.computePublicKey(other);
        return hexlify(secp256k1.getSharedSecret(getBytesCopy(this.#privateKey), pubKey));
    }
    static computePublicKey(key, compressed) {
        let bytes = getBytes(key, "key");
        if (bytes.length === 32) {
            const pubKey = secp256k1.getPublicKey(bytes, !!compressed);
            return hexlify(pubKey);
        }
        if (bytes.length === 64) {
            const pub = new Uint8Array(65);
            pub[0] = 0x04;
            pub.set(bytes, 1);
            bytes = pub;
        }
        const point = secp256k1.Point.fromHex(bytes);
        return hexlify(point.toRawBytes(compressed));
    }
    static recoverPublicKey(digest, signature) {
        assertArgument(dataLength(digest) === 32, "invalid digest length", "digest", digest);
        const sig = Signature.from(signature);
        const der = secp256k1.Signature.fromCompact(getBytesCopy(concat([sig.r, sig.s]))).toDERRawBytes();
        const pubKey = secp256k1.recoverPublicKey(getBytesCopy(digest), der, sig.yParity);
        if (pubKey != null) {
            return hexlify(pubKey);
        }
        assertArgument(false, "invalid signautre for digest", "signature", signature);
    }
    static _addPoints(p0, p1, compressed) {
        const pub0 = secp256k1.Point.fromHex(SigningKey.computePublicKey(p0).substring(2));
        const pub1 = secp256k1.Point.fromHex(SigningKey.computePublicKey(p1).substring(2));
        return "0x" + pub0.add(pub1).toHex(!!compressed);
    }
}
/*
const key = new SigningKey("0x1234567890123456789012345678901234567890123456789012345678901234");
console.log(key);
console.log(key.sign("0x1234567890123456789012345678901234567890123456789012345678901234"));
{
  const privKey = "0x1234567812345678123456781234567812345678123456781234567812345678";
  const signingKey = new SigningKey(privKey);
  console.log("0", signingKey, signingKey.publicKey, signingKey.publicKeyCompressed);

  let pubKey = SigningKey.computePublicKey(privKey);
  let pubKeyComp = SigningKey.computePublicKey(privKey, true);
  let pubKeyRaw = "0x" + SigningKey.computePublicKey(privKey).substring(4);
  console.log("A", pubKey, pubKeyComp);

  let a = SigningKey.computePublicKey(pubKey);
  let b = SigningKey.computePublicKey(pubKey, true);
  console.log("B", a, b);

  a = SigningKey.computePublicKey(pubKeyComp);
  b = SigningKey.computePublicKey(pubKeyComp, true);
  console.log("C", a, b);

  a = SigningKey.computePublicKey(pubKeyRaw);
  b = SigningKey.computePublicKey(pubKeyRaw, true);
  console.log("D", a, b);

  const digest = "0x1122334411223344112233441122334411223344112233441122334411223344";
  const sig = signingKey.sign(digest);
  console.log("SS", sig, sig.r, sig.s, sig.yParity);

  console.log("R", SigningKey.recoverPublicKey(digest, sig));
}
*/
//# sourceMappingURL=signing-key.js.map