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Verify Multiple P-256 Verifiers Are Supported
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modules/passkey/contracts/test/TestWebAuthnSignerFactory.sol
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,86 @@ | ||
| // SPDX-License-Identifier: LGPL-3.0-only | ||
| /* solhint-disable one-contract-per-file */ | ||
| pragma solidity ^0.8.0; | ||
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| import {IP256Verifier, P256VerifierLib} from "../verifiers/IP256Verifier.sol"; | ||
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| contract TestWebAuthnSignerFactory { | ||
| function createSigner(address verifier, uint256 x, uint256 y) external returns (TestWebAuthnSigner signer) { | ||
| signer = new TestWebAuthnSigner{salt: 0}(verifier, x, y); | ||
| } | ||
| } | ||
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| contract TestWebAuthnSigner { | ||
| using P256VerifierLib for IP256Verifier; | ||
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| struct SignatureData { | ||
| bytes authenticatorData; | ||
| bytes clientDataFields; | ||
| uint256 r; | ||
| uint256 s; | ||
| } | ||
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| string private constant _BASE64URL = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_"; | ||
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| address private immutable _VERIFIER; | ||
| uint256 private immutable _X; | ||
| uint256 private immutable _Y; | ||
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| constructor(address verifier, uint256 x, uint256 y) { | ||
| _VERIFIER = verifier; | ||
| _X = x; | ||
| _Y = y; | ||
| } | ||
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| function isValidSignature(bytes32 hash, bytes calldata signature) external view returns (bytes4 magicValue) { | ||
| SignatureData calldata sig; | ||
| // solhint-disable-next-line no-inline-assembly | ||
| assembly ("memory-safe") { | ||
| sig := signature.offset | ||
| } | ||
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| if ( | ||
| IP256Verifier(_VERIFIER).verifySignatureAllowMalleability( | ||
| _signingMessage(hash, sig.authenticatorData, sig.clientDataFields), | ||
| sig.r, | ||
| sig.s, | ||
| _X, | ||
| _Y | ||
| ) | ||
| ) { | ||
| magicValue = this.isValidSignature.selector; | ||
| } | ||
| } | ||
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| function _signingMessage( | ||
| bytes32 challenge, | ||
| bytes calldata authenticatorData, | ||
| bytes calldata clientDataFields | ||
| ) internal pure returns (bytes32 message) { | ||
| /* solhint-disable quotes */ | ||
| bytes memory clientDataJson = abi.encodePacked( | ||
| '{"type":"webauthn.get","challenge":"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA",', | ||
| clientDataFields, | ||
| "}" | ||
| ); | ||
| /* solhint-enable quotes */ | ||
|
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| string memory alphabet = _BASE64URL; | ||
| // solhint-disable-next-line no-inline-assembly | ||
| assembly ("memory-safe") { | ||
| let lut := add(alphabet, 1) | ||
| let ptr := add(clientDataJson, 68) | ||
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| for { | ||
| let i := 0 | ||
| } lt(i, 42) { | ||
| i := add(i, 1) | ||
| } { | ||
| mstore8(add(ptr, i), mload(add(lut, and(0x3f, shr(sub(250, mul(6, i)), challenge))))) | ||
| } | ||
| mstore8(add(ptr, 42), mload(add(lut, and(0x3f, shl(2, challenge))))) | ||
| } | ||
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| message = sha256(abi.encodePacked(authenticatorData, sha256(clientDataJson))); | ||
| } | ||
| } |
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