Revert "ERC-7913 signature verifier for ZKEmail (#103)"

This reverts commit 886d1c5.

Author: ernestognw

contracts/utils/cryptography/ERC7913SignatureVerifierZKEmail.sol

@@ -81,10 +81,8 @@ abstract contract SignerZKEmail is AbstractSigner {
         return _registry;
     }
 
-    /**
-     * @dev An instance of the Verifier contract.
-     * See https://docs.zk.email/architecture/zk-proofs#how-zk-email-uses-zero-knowledge-proofs[ZK Proofs].
-     */
+    /// @dev An instance of the Verifier contract.
+    /// See https://docs.zk.email/architecture/zk-proofs#how-zk-email-uses-zero-knowledge-proofs[ZK Proofs].
     function verifier() public view virtual returns (IVerifier) {
         return _verifier;
     }

contracts/utils/cryptography/SignerZKEmail.sol

@@ -3,7 +3,7 @@ const { loadFixture } = require('@nomicfoundation/hardhat-network-helpers');
 
 const { getDomain } = require('@openzeppelin/contracts/test/helpers/eip712');
 const { ERC4337Helper } = require('../helpers/erc4337');
-const { NonNativeSigner, P256SigningKey, RSASHA256SigningKey, ZKEmailSigningKey } = require('../helpers/signers');
+const { NonNativeSigner, P256SigningKey, RSASHA256SigningKey } = require('../helpers/signers');
 const { PackedUserOperation } = require('../helpers/eip712-types');
 
 const { shouldBehaveLikeAccountCore, shouldBehaveLikeAccountHolder } = require('./Account.behavior');
@@ -15,36 +15,15 @@ const signerECDSA = ethers.Wallet.createRandom();
 const signerP256 = new NonNativeSigner(P256SigningKey.random());
 const signerRSA = new NonNativeSigner(RSASHA256SigningKey.random());
 
-// Constants for ZKEmail
-const accountSalt = '0x046582bce36cdd0a8953b9d40b8f20d58302bacf3bcecffeb6741c98a52725e2'; // keccak256("[email protected]")
-const selector = '12345';
-const domainName = 'gmail.com';
-const publicKeyHash = '0x0ea9c777dc7110e5a9e89b13f0cfc540e3845ba120b2b6dc24024d61488d4788';
-const emailNullifier = '0x00a83fce3d4b1c9ef0f600644c1ecc6c8115b57b1596e0e3295e2c5105fbfd8a';
-const templateId = ethers.solidityPackedKeccak256(['string', 'uint256'], ['TEST', 0n]);
-
 // Minimal fixture common to the different signer verifiers
 async function fixture() {
   // EOAs and environment
-  const [admin, beneficiary, other] = await ethers.getSigners();
+  const [beneficiary, other] = await ethers.getSigners();
   const target = await ethers.deployContract('CallReceiverMockExtended');
 
-  // DKIM Registry for ZKEmail
-  const dkim = await ethers.deployContract('ECDSAOwnedDKIMRegistry');
-  await dkim.initialize(admin, admin);
-  await dkim
-    .SET_PREFIX()
-    .then(prefix => dkim.computeSignedMsg(prefix, domainName, publicKeyHash))
-    .then(message => admin.signMessage(message))
-    .then(signature => dkim.setDKIMPublicKeyHash(selector, domainName, publicKeyHash, signature));
-
-  // ZKEmail Verifier
-  const zkEmailVerifier = await ethers.deployContract('ZKEmailVerifierMock');
-
   // ERC-7913 verifiers
   const verifierP256 = await ethers.deployContract('ERC7913SignatureVerifierP256');
   const verifierRSA = await ethers.deployContract('ERC7913SignatureVerifierRSA');
-  const verifierZKEmail = await ethers.deployContract('$ERC7913SignatureVerifierZKEmail');
 
   // ERC-4337 env
   const helper = new ERC4337Helper();
@@ -64,20 +43,7 @@ async function fixture() {
       .then(signature => Object.assign(userOp, { signature }));
   };
 
-  return {
-    helper,
-    verifierP256,
-    verifierRSA,
-    verifierZKEmail,
-    dkim,
-    zkEmailVerifier,
-    domain,
-    target,
-    beneficiary,
-    other,
-    makeMock,
-    signUserOp,
-  };
+  return { helper, verifierP256, verifierRSA, domain, target, beneficiary, other, makeMock, signUserOp };
 }
 
 describe('AccountERC7913', function () {
@@ -137,36 +103,4 @@ describe('AccountERC7913', function () {
     shouldBehaveLikeERC1271({ erc7739: true });
     shouldBehaveLikeERC7821();
   });
-
-  // Using ZKEmail with an ERC-7913 verifier
-  describe('ZKEmail', function () {
-    beforeEach(async function () {
-      // Create ZKEmail signer
-      this.signer = new NonNativeSigner(
-        new ZKEmailSigningKey(domainName, publicKeyHash, emailNullifier, accountSalt, templateId),
-      );
-
-      // Create account with ZKEmail verifier
-      this.mock = await this.makeMock(
-        ethers.concat([
-          this.verifierZKEmail.target,
-          ethers.AbiCoder.defaultAbiCoder().encode(
-            ['address', 'bytes32', 'address', 'uint256'],
-            [this.dkim.target, accountSalt, this.zkEmailVerifier.target, templateId],
-          ),
-        ]),
-      );
-
-      // Override the signUserOp function to use the ZKEmail signer
-      this.signUserOp = async userOp => {
-        const hash = await userOp.hash();
-        return Object.assign(userOp, { signature: this.signer.signingKey.sign(hash).serialized });
-      };
-    });
-
-    shouldBehaveLikeAccountCore();
-    shouldBehaveLikeAccountHolder();
-    shouldBehaveLikeERC1271({ erc7739: true });
-    shouldBehaveLikeERC7821();
-  });
 });