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{ TypedTransaction } from '@ethereumjs/tx';\nimport {\n ecsign,\n isValidPrivate,\n privateToPublic,\n publicToAddress,\n stripHexPrefix,\n} from '@ethereumjs/util';\nimport {\n concatSig,\n decrypt,\n EIP7702Authorization,\n getEncryptionPublicKey,\n normalize,\n personalSign,\n signEIP7702Authorization,\n signTypedData,\n SignTypedDataVersion,\n} from '@metamask/eth-sig-util';\nimport type {\n TypedDataV1,\n MessageTypes,\n TypedMessage,\n} from '@metamask/eth-sig-util';\nimport { Keyring } from '@metamask/keyring-utils';\nimport {\n add0x,\n bigIntToBytes,\n bytesToHex,\n Eip1024EncryptedData,\n Hex,\n} from '@metamask/utils';\nimport { keccak256 } from 'ethereum-cryptography/keccak';\nimport randombytes from 'randombytes';\n\ntype KeyringOpt = {\n withAppKeyOrigin?: string;\n version?: SignTypedDataVersion | string;\n};\n\ntype Wallet = {\n privateKey: Buffer;\n publicKey: Buffer;\n};\n\nconst TYPE = 'Simple Key Pair';\n\n// FIXME: This should not be exported as default.\nexport default class SimpleKeyring implements Keyring {\n #wallets: { privateKey: Buffer; publicKey: Buffer }[];\n\n readonly type: string = TYPE;\n\n static type: string = TYPE;\n\n constructor(privateKeys: string[] = []) {\n this.#wallets = [];\n\n /* istanbul ignore next: It's not possible to write a unit test for this, because a constructor isn't allowed\n * to be async. Jest can't await the constructor, and when the error gets thrown, Jest can't catch it. */\n this.deserialize(privateKeys).catch((error: Error) => {\n throw new Error(`Problem deserializing SimpleKeyring ${error.message}`);\n });\n }\n\n async serialize(): Promise {\n return this.#wallets.map((a) => a.privateKey.toString('hex'));\n }\n\n async deserialize(privateKeys: string[]): Promise {\n this.#wallets = privateKeys.map((hexPrivateKey) => {\n const strippedHexPrivateKey = stripHexPrefix(hexPrivateKey);\n const privateKey = Buffer.from(strippedHexPrivateKey, 'hex');\n const publicKey = Buffer.from(privateToPublic(privateKey));\n return { privateKey, publicKey };\n });\n }\n\n async addAccounts(numAccounts = 1): Promise {\n const newWallets = [];\n for (let i = 0; i < numAccounts; i++) {\n const privateKey = generateKey();\n const publicKey = Buffer.from(privateToPublic(privateKey));\n newWallets.push({ privateKey, publicKey });\n }\n this.#wallets = this.#wallets.concat(newWallets);\n const hexWallets = newWallets.map(({ publicKey }) =>\n add0x(bytesToHex(publicToAddress(publicKey))),\n );\n return hexWallets;\n }\n\n async getAccounts(): Promise {\n return this.#wallets.map(({ publicKey }) =>\n add0x(bytesToHex(publicToAddress(publicKey))),\n );\n }\n\n async signTransaction(\n address: Hex,\n transaction: TypedTransaction,\n opts: KeyringOpt = {},\n ): Promise {\n const privKey = this.#getPrivateKeyFor(address, opts);\n const signedTx = transaction.sign(privKey);\n // Newer versions of Ethereumjs-tx are immutable and return a new tx object\n return signedTx ?? transaction;\n }\n\n async signEip7702Authorization(\n address: Hex,\n authorization: EIP7702Authorization,\n opts: KeyringOpt = {},\n ): Promise {\n const privateKey = this.#getPrivateKeyFor(address, opts);\n return signEIP7702Authorization({ privateKey, authorization });\n }\n\n // For eth_sign, we need to sign arbitrary data:\n async signMessage(\n address: Hex,\n data: string,\n opts = { withAppKeyOrigin: '', validateMessage: true },\n ): Promise {\n const message = stripHexPrefix(data);\n if (\n opts.validateMessage &&\n (message.length === 0 || !message.match(/^[a-fA-F0-9]*$/u))\n ) {\n throw new Error('Cannot sign invalid message');\n }\n const privKey = this.#getPrivateKeyFor(address, opts);\n const msgSig = ecsign(Buffer.from(message, 'hex'), privKey);\n const rawMsgSig = concatSig(\n Buffer.from(bigIntToBytes(msgSig.v)),\n Buffer.from(msgSig.r),\n Buffer.from(msgSig.s),\n );\n return rawMsgSig;\n }\n\n // For personal_sign, we need to prefix the message:\n async signPersonalMessage(\n address: Hex,\n msgHex: Hex,\n opts = { withAppKeyOrigin: '' },\n ): Promise {\n const privKey = this.#getPrivateKeyFor(address, opts);\n return personalSign({ privateKey: privKey, data: msgHex });\n }\n\n // For eth_decryptMessage:\n async decryptMessage(\n withAccount: Hex,\n encryptedData: Eip1024EncryptedData,\n ): Promise {\n const wallet = this.#getWalletForAccount(withAccount);\n const privateKey = wallet.privateKey.toString('hex');\n return decrypt({ privateKey, encryptedData });\n }\n\n async signTypedData<\n Version extends SignTypedDataVersion,\n Types extends MessageTypes,\n Options extends { version?: Version } & KeyringOpt,\n >(\n address: Hex,\n data: Version extends 'V1' ? TypedDataV1 : TypedMessage,\n options?: Options,\n ): Promise {\n let { version } = options ?? { version: SignTypedDataVersion.V1 };\n\n // Treat invalid versions as \"V1\"\n if (!version || !isSignTypedDataVersion(version)) {\n version = SignTypedDataVersion.V1;\n }\n\n const privateKey = this.#getPrivateKeyFor(address, options);\n return signTypedData({ privateKey, data, version });\n }\n\n // get public key for nacl\n async getEncryptionPublicKey(\n withAccount: Hex,\n opts?: KeyringOpt,\n ): Promise {\n const privKey = this.#getPrivateKeyFor(withAccount, opts);\n const publicKey = getEncryptionPublicKey(privKey.toString('hex'));\n return publicKey;\n }\n\n #getPrivateKeyFor(\n address: Hex,\n opts: KeyringOpt = { withAppKeyOrigin: '' },\n ): Buffer {\n if (!address) {\n throw new Error('Must specify address.');\n }\n const wallet = this.#getWalletForAccount(address, opts);\n return wallet.privateKey;\n }\n\n // returns an address specific to an app\n async getAppKeyAddress(address: Hex, origin: string): Promise {\n if (!origin || typeof origin !== 'string') {\n throw new Error(`'origin' must be a non-empty string`);\n }\n const wallet = this.#getWalletForAccount(address, {\n withAppKeyOrigin: origin,\n });\n const appKeyAddress = add0x(bytesToHex(publicToAddress(wallet.publicKey)));\n return appKeyAddress;\n }\n\n // exportAccount should return a hex-encoded private key:\n async exportAccount(\n address: Hex,\n opts = { withAppKeyOrigin: '' },\n ): Promise {\n const wallet = this.#getWalletForAccount(address, opts);\n return wallet.privateKey.toString('hex');\n }\n\n removeAccount(address: string): void {\n if (\n !this.#wallets\n .map(({ publicKey }) =>\n bytesToHex(publicToAddress(publicKey)).toLowerCase(),\n )\n .includes(address.toLowerCase())\n ) {\n throw new Error(`Address ${address} not found in this keyring`);\n }\n\n this.#wallets = this.#wallets.filter(\n ({ publicKey }) =>\n bytesToHex(publicToAddress(publicKey)).toLowerCase() !==\n address.toLowerCase(),\n );\n }\n\n #getWalletForAccount(\n account: string | number,\n opts: KeyringOpt = {},\n ): Wallet {\n const address = normalize(account);\n let wallet = this.#wallets.find(\n ({ publicKey }) => bytesToHex(publicToAddress(publicKey)) === address,\n );\n if (!wallet) {\n throw new Error('Simple Keyring - Unable to find matching address.');\n }\n\n if (opts.withAppKeyOrigin) {\n const { privateKey } = wallet;\n const appKeyOriginBuffer = Buffer.from(opts.withAppKeyOrigin, 'utf8');\n const appKeyBuffer = Buffer.concat([privateKey, appKeyOriginBuffer]);\n const appKeyPrivateKey = keccak256(appKeyBuffer);\n const appKeyPublicKey = privateToPublic(appKeyPrivateKey);\n wallet = {\n privateKey: Buffer.from(appKeyPrivateKey),\n publicKey: Buffer.from(appKeyPublicKey),\n };\n }\n\n return wallet;\n }\n}\n\n/**\n * Generate and validate a new random key of 32 bytes.\n *\n * @returns Buffer The generated key.\n */\nfunction generateKey(): Buffer {\n const privateKey = randombytes(32);\n\n if (!isValidPrivate(privateKey)) {\n throw new Error(\n 'Private key does not satisfy the curve requirements (ie. it is invalid)',\n );\n }\n return privateKey;\n}\n\n/**\n * Type predicate type guard to check if a string is in the enum SignTypedDataVersion.\n *\n * @param version - The string to check.\n * @returns Whether it's in the enum.\n */\n// TODO: Put this in @metamask/eth-sig-util\nfunction isSignTypedDataVersion(\n version: SignTypedDataVersion | string,\n): version is SignTypedDataVersion {\n return version in SignTypedDataVersion;\n}\n"]}