o1js/src/examples/crypto/ecdsa/ecdsa.ts

TypeScript framework for zk-SNARKs and zkApps

import { Bool, Bytes, Crypto, Hash, ZkProgram, createEcdsa, createForeignCurve } from 'o1js';

export { Bytes32, Ecdsa, Secp256k1, ecdsa, ecdsaEthers, keccakAndEcdsa };

class Secp256k1 extends createForeignCurve(Crypto.CurveParams.Secp256k1) {}
class Scalar extends Secp256k1.Scalar {}
class Ecdsa extends createEcdsa(Secp256k1) {}
class Bytes32 extends Bytes(32) {}

const keccakAndEcdsa = ZkProgram({
  name: 'ecdsa',
  publicInput: Bytes32,
  publicOutput: Bool,

  methods: {
    verifyEcdsa: {
      privateInputs: [Ecdsa, Secp256k1],
      async method(message: Bytes32, signature: Ecdsa, publicKey: Secp256k1) {
        return {
          publicOutput: signature.verify(message, publicKey),
        };
      },
    },
  },
});

const ecdsa = ZkProgram({
  name: 'ecdsa-only',
  publicInput: Scalar,
  publicOutput: Bool,

  methods: {
    verifySignedHash: {
      privateInputs: [Ecdsa, Secp256k1],
      async method(message: Scalar, signature: Ecdsa, publicKey: Secp256k1) {
        return {
          publicOutput: signature.verifySignedHash(message, publicKey),
        };
      },
    },
  },
});

const ecdsaEthers = ZkProgram({
  name: 'ecdsa-ethers',
  publicInput: Bytes32,
  publicOutput: Bool,

  methods: {
    verifyEthers: {
      privateInputs: [Ecdsa, Secp256k1],
      async method(message: Bytes32, signature: Ecdsa, publicKey: Secp256k1) {
        return { publicOutput: signature.verifyEthers(message, publicKey) };
      },
    },
  },
});

/**
 * We can also use a different hash function with ECDSA, like SHA-256.
 */
const sha256AndEcdsa = ZkProgram({
  name: 'ecdsa-sha256',
  publicInput: Bytes32,
  publicOutput: Bool,

  methods: {
    verifyEcdsa: {
      privateInputs: [Ecdsa, Secp256k1],
      async method(message: Bytes32, signature: Ecdsa, publicKey: Secp256k1) {
        let messageHash = Hash.SHA2_256.hash(message);
        return {
          publicOutput: signature.verifySignedHash(messageHash, publicKey),
        };
      },
    },
  },
});