// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
// Copyright Joyent, Inc. and Node.js contributors. All rights reserved. MIT license.

// TODO(petamoriken): enable prefer-primordials for node polyfills
// deno-lint-ignore-file no-explicit-any prefer-primordials

import { KeyObject } from "ext:deno_node/internal/crypto/keys.ts";
import { kAesKeyLengths } from "ext:deno_node/internal/crypto/util.ts";
import {
  PrivateKeyObject,
  PublicKeyObject,
  SecretKeyObject,
  setOwnedKey,
} from "ext:deno_node/internal/crypto/keys.ts";
import { notImplemented } from "ext:deno_node/_utils.ts";
import {
  ERR_INCOMPATIBLE_OPTION_PAIR,
  ERR_INVALID_ARG_VALUE,
  ERR_MISSING_OPTION,
} from "ext:deno_node/internal/errors.ts";
import {
  validateBuffer,
  validateFunction,
  validateInt32,
  validateInteger,
  validateObject,
  validateOneOf,
  validateString,
  validateUint32,
} from "ext:deno_node/internal/validators.mjs";
import { Buffer } from "node:buffer";
import { KeyFormat, KeyType } from "ext:deno_node/internal/crypto/types.ts";

import {
  op_node_dh_generate,
  op_node_dh_generate_async,
  op_node_dh_generate_group,
  op_node_dh_generate_group_async,
  op_node_dsa_generate,
  op_node_dsa_generate_async,
  op_node_ec_generate,
  op_node_ec_generate_async,
  op_node_ed25519_generate,
  op_node_ed25519_generate_async,
  op_node_generate_rsa,
  op_node_generate_rsa_async,
  op_node_generate_secret,
  op_node_generate_secret_async,
  op_node_x25519_generate,
  op_node_x25519_generate_async,
} from "ext:core/ops";

function validateGenerateKey(
  type: "hmac" | "aes",
  options: { length: number },
) {
  validateString(type, "type");
  validateObject(options, "options");
  const { length } = options;
  switch (type) {
    case "hmac":
      validateInteger(length, "options.length", 8, 2 ** 31 - 1);
      break;
    case "aes":
      validateOneOf(length, "options.length", kAesKeyLengths);
      break;
    default:
      throw new ERR_INVALID_ARG_VALUE(
        "type",
        type,
        "must be a supported key type",
      );
  }
}

export function generateKeySync(
  type: "hmac" | "aes",
  options: {
    length: number;
  },
): KeyObject {
  validateGenerateKey(type, options);
  const { length } = options;

  const key = new Uint8Array(Math.floor(length / 8));
  op_node_generate_secret(key);

  return new SecretKeyObject(setOwnedKey(key));
}

export function generateKey(
  type: "hmac" | "aes",
  options: {
    length: number;
  },
  callback: (err: Error | null, key: KeyObject) => void,
) {
  validateGenerateKey(type, options);
  validateFunction(callback, "callback");
  const { length } = options;

  op_node_generate_secret_async(Math.floor(length / 8)).then(
    (key) => {
      callback(null, new SecretKeyObject(setOwnedKey(key)));
    },
  );
}

export interface BasePrivateKeyEncodingOptions<T extends KeyFormat> {
  format: T;
  cipher?: string | undefined;
  passphrase?: string | undefined;
}

export interface RSAKeyPairOptions<
  PubF extends KeyFormat,
  PrivF extends KeyFormat,
> {
  /**
   * Key size in bits
   */
  modulusLength: number;
  /**
   * Public exponent
   * @default 0x10001
   */
  publicExponent?: number | undefined;
  publicKeyEncoding: {
    type: "pkcs1" | "spki";
    format: PubF;
  };
  privateKeyEncoding: BasePrivateKeyEncodingOptions<PrivF> & {
    type: "pkcs1" | "pkcs8";
  };
}

export interface RSAPSSKeyPairOptions<
  PubF extends KeyFormat,
  PrivF extends KeyFormat,
> {
  /**
   * Key size in bits
   */
  modulusLength: number;
  /**
   * Public exponent
   * @default 0x10001
   */
  publicExponent?: number | undefined;
  /**
   * Name of the message digest
   */
  hashAlgorithm?: string;
  /**
   * Name of the message digest used by MGF1
   */
  mgf1HashAlgorithm?: string;
  /**
   * Minimal salt length in bytes
   */
  saltLength?: string;
  publicKeyEncoding: {
    type: "spki";
    format: PubF;
  };
  privateKeyEncoding: BasePrivateKeyEncodingOptions<PrivF> & {
    type: "pkcs8";
  };
}

export interface DSAKeyPairOptions<
  PubF extends KeyFormat,
  PrivF extends KeyFormat,
> {
  /**
   * Key size in bits
   */
  modulusLength: number;
  /**
   * Size of q in bits
   */
  divisorLength: number;
  publicKeyEncoding: {
    type: "spki";
    format: PubF;
  };
  privateKeyEncoding: BasePrivateKeyEncodingOptions<PrivF> & {
    type: "pkcs8";
  };
}

export interface ECKeyPairOptions<
  PubF extends KeyFormat,
  PrivF extends KeyFormat,
> {
  /**
   * Name of the curve to use.
   */
  namedCurve: string;
  publicKeyEncoding: {
    type: "pkcs1" | "spki";
    format: PubF;
  };
  privateKeyEncoding: BasePrivateKeyEncodingOptions<PrivF> & {
    type: "sec1" | "pkcs8";
  };
}

export interface ED25519KeyPairOptions<
  PubF extends KeyFormat,
  PrivF extends KeyFormat,
> {
  publicKeyEncoding: {
    type: "spki";
    format: PubF;
  };
  privateKeyEncoding: BasePrivateKeyEncodingOptions<PrivF> & {
    type: "pkcs8";
  };
}

export interface ED448KeyPairOptions<
  PubF extends KeyFormat,
  PrivF extends KeyFormat,
> {
  publicKeyEncoding: {
    type: "spki";
    format: PubF;
  };
  privateKeyEncoding: BasePrivateKeyEncodingOptions<PrivF> & {
    type: "pkcs8";
  };
}

export interface X25519KeyPairOptions<
  PubF extends KeyFormat,
  PrivF extends KeyFormat,
> {
  publicKeyEncoding: {
    type: "spki";
    format: PubF;
  };
  privateKeyEncoding: BasePrivateKeyEncodingOptions<PrivF> & {
    type: "pkcs8";
  };
}

export interface X448KeyPairOptions<
  PubF extends KeyFormat,
  PrivF extends KeyFormat,
> {
  publicKeyEncoding: {
    type: "spki";
    format: PubF;
  };
  privateKeyEncoding: BasePrivateKeyEncodingOptions<PrivF> & {
    type: "pkcs8";
  };
}

export interface RSAKeyPairKeyObjectOptions {
  /**
   * Key size in bits
   */
  modulusLength: number;
  /**
   * Public exponent
   * @default 0x10001
   */
  publicExponent?: number | undefined;
}

export interface RSAPSSKeyPairKeyObjectOptions {
  /**
   * Key size in bits
   */
  modulusLength: number;
  /**
   * Public exponent
   * @default 0x10001
   */
  publicExponent?: number | undefined;
  /**
   * Name of the message digest
   */
  hashAlgorithm?: string;
  /**
   * Name of the message digest used by MGF1
   */
  mgf1HashAlgorithm?: string;
  /**
   * Minimal salt length in bytes
   */
  saltLength?: string;
}

export interface DSAKeyPairKeyObjectOptions {
  /**
   * Key size in bits
   */
  modulusLength: number;
  /**
   * Size of q in bits
   */
  divisorLength: number;
}

// deno-lint-ignore no-empty-interface
export interface ED25519KeyPairKeyObjectOptions {}

// deno-lint-ignore no-empty-interface
export interface ED448KeyPairKeyObjectOptions {}

// deno-lint-ignore no-empty-interface
export interface X25519KeyPairKeyObjectOptions {}

// deno-lint-ignore no-empty-interface
export interface X448KeyPairKeyObjectOptions {}

export interface ECKeyPairKeyObjectOptions {
  /**
   * Name of the curve to use
   */
  namedCurve: string;
}

export function generateKeyPair(
  type: "rsa",
  options: RSAKeyPairOptions<"pem", "pem">,
  callback: (err: Error | null, publicKey: string, privateKey: string) => void,
): void;
export function generateKeyPair(
  type: "rsa",
  options: RSAKeyPairOptions<"pem", "der">,
  callback: (err: Error | null, publicKey: string, privateKey: Buffer) => void,
): void;
export function generateKeyPair(
  type: "rsa",
  options: RSAKeyPairOptions<"der", "pem">,
  callback: (err: Error | null, publicKey: Buffer, privateKey: string) => void,
): void;
export function generateKeyPair(
  type: "rsa",
  options: RSAKeyPairOptions<"der", "der">,
  callback: (err: Error | null, publicKey: Buffer, privateKey: Buffer) => void,
): void;
export function generateKeyPair(
  type: "rsa",
  options: RSAKeyPairKeyObjectOptions,
  callback: (
    err: Error | null,
    publicKey: KeyObject,
    privateKey: KeyObject,
  ) => void,
): void;
export function generateKeyPair(
  type: "rsa-pss",
  options: RSAPSSKeyPairOptions<"pem", "pem">,
  callback: (err: Error | null, publicKey: string, privateKey: string) => void,
): void;
export function generateKeyPair(
  type: "rsa-pss",
  options: RSAPSSKeyPairOptions<"pem", "der">,
  callback: (err: Error | null, publicKey: string, privateKey: Buffer) => void,
): void;
export function generateKeyPair(
  type: "rsa-pss",
  options: RSAPSSKeyPairOptions<"der", "pem">,
  callback: (err: Error | null, publicKey: Buffer, privateKey: string) => void,
): void;
export function generateKeyPair(
  type: "rsa-pss",
  options: RSAPSSKeyPairOptions<"der", "der">,
  callback: (err: Error | null, publicKey: Buffer, privateKey: Buffer) => void,
): void;
export function generateKeyPair(
  type: "rsa-pss",
  options: RSAPSSKeyPairKeyObjectOptions,
  callback: (
    err: Error | null,
    publicKey: KeyObject,
    privateKey: KeyObject,
  ) => void,
): void;
export function generateKeyPair(
  type: "dsa",
  options: DSAKeyPairOptions<"pem", "pem">,
  callback: (err: Error | null, publicKey: string, privateKey: string) => void,
): void;
export function generateKeyPair(
  type: "dsa",
  options: DSAKeyPairOptions<"pem", "der">,
  callback: (err: Error | null, publicKey: string, privateKey: Buffer) => void,
): void;
export function generateKeyPair(
  type: "dsa",
  options: DSAKeyPairOptions<"der", "pem">,
  callback: (err: Error | null, publicKey: Buffer, privateKey: string) => void,
): void;
export function generateKeyPair(
  type: "dsa",
  options: DSAKeyPairOptions<"der", "der">,
  callback: (err: Error | null, publicKey: Buffer, privateKey: Buffer) => void,
): void;
export function generateKeyPair(
  type: "dsa",
  options: DSAKeyPairKeyObjectOptions,
  callback: (
    err: Error | null,
    publicKey: KeyObject,
    privateKey: KeyObject,
  ) => void,
): void;
export function generateKeyPair(
  type: "ec",
  options: ECKeyPairOptions<"pem", "pem">,
  callback: (err: Error | null, publicKey: string, privateKey: string) => void,
): void;
export function generateKeyPair(
  type: "ec",
  options: ECKeyPairOptions<"pem", "der">,
  callback: (err: Error | null, publicKey: string, privateKey: Buffer) => void,
): void;
export function generateKeyPair(
  type: "ec",
  options: ECKeyPairOptions<"der", "pem">,
  callback: (err: Error | null, publicKey: Buffer, privateKey: string) => void,
): void;
export function generateKeyPair(
  type: "ec",
  options: ECKeyPairOptions<"der", "der">,
  callback: (err: Error | null, publicKey: Buffer, privateKey: Buffer) => void,
): void;
export function generateKeyPair(
  type: "ec",
  options: ECKeyPairKeyObjectOptions,
  callback: (
    err: Error | null,
    publicKey: KeyObject,
    privateKey: KeyObject,
  ) => void,
): void;
export function generateKeyPair(
  type: "ed25519",
  options: ED25519KeyPairOptions<"pem", "pem">,
  callback: (err: Error | null, publicKey: string, privateKey: string) => void,
): void;
export function generateKeyPair(
  type: "ed25519",
  options: ED25519KeyPairOptions<"pem", "der">,
  callback: (err: Error | null, publicKey: string, privateKey: Buffer) => void,
): void;
export function generateKeyPair(
  type: "ed25519",
  options: ED25519KeyPairOptions<"der", "pem">,
  callback: (err: Error | null, publicKey: Buffer, privateKey: string) => void,
): void;
export function generateKeyPair(
  type: "ed25519",
  options: ED25519KeyPairOptions<"der", "der">,
  callback: (err: Error | null, publicKey: Buffer, privateKey: Buffer) => void,
): void;
export function generateKeyPair(
  type: "ed25519",
  options: ED25519KeyPairKeyObjectOptions | undefined,
  callback: (
    err: Error | null,
    publicKey: KeyObject,
    privateKey: KeyObject,
  ) => void,
): void;
export function generateKeyPair(
  type: "ed448",
  options: ED448KeyPairOptions<"pem", "pem">,
  callback: (err: Error | null, publicKey: string, privateKey: string) => void,
): void;
export function generateKeyPair(
  type: "ed448",
  options: ED448KeyPairOptions<"pem", "der">,
  callback: (err: Error | null, publicKey: string, privateKey: Buffer) => void,
): void;
export function generateKeyPair(
  type: "ed448",
  options: ED448KeyPairOptions<"der", "pem">,
  callback: (err: Error | null, publicKey: Buffer, privateKey: string) => void,
): void;
export function generateKeyPair(
  type: "ed448",
  options: ED448KeyPairOptions<"der", "der">,
  callback: (err: Error | null, publicKey: Buffer, privateKey: Buffer) => void,
): void;
export function generateKeyPair(
  type: "ed448",
  options: ED448KeyPairKeyObjectOptions | undefined,
  callback: (
    err: Error | null,
    publicKey: KeyObject,
    privateKey: KeyObject,
  ) => void,
): void;
export function generateKeyPair(
  type: "x25519",
  options: X25519KeyPairOptions<"pem", "pem">,
  callback: (err: Error | null, publicKey: string, privateKey: string) => void,
): void;
export function generateKeyPair(
  type: "x25519",
  options: X25519KeyPairOptions<"pem", "der">,
  callback: (err: Error | null, publicKey: string, privateKey: Buffer) => void,
): void;
export function generateKeyPair(
  type: "x25519",
  options: X25519KeyPairOptions<"der", "pem">,
  callback: (err: Error | null, publicKey: Buffer, privateKey: string) => void,
): void;
export function generateKeyPair(
  type: "x25519",
  options: X25519KeyPairOptions<"der", "der">,
  callback: (err: Error | null, publicKey: Buffer, privateKey: Buffer) => void,
): void;
export function generateKeyPair(
  type: "x25519",
  options: X25519KeyPairKeyObjectOptions | undefined,
  callback: (
    err: Error | null,
    publicKey: KeyObject,
    privateKey: KeyObject,
  ) => void,
): void;
export function generateKeyPair(
  type: "x448",
  options: X448KeyPairOptions<"pem", "pem">,
  callback: (err: Error | null, publicKey: string, privateKey: string) => void,
): void;
export function generateKeyPair(
  type: "x448",
  options: X448KeyPairOptions<"pem", "der">,
  callback: (err: Error | null, publicKey: string, privateKey: Buffer) => void,
): void;
export function generateKeyPair(
  type: "x448",
  options: X448KeyPairOptions<"der", "pem">,
  callback: (err: Error | null, publicKey: Buffer, privateKey: string) => void,
): void;
export function generateKeyPair(
  type: "x448",
  options: X448KeyPairOptions<"der", "der">,
  callback: (err: Error | null, publicKey: Buffer, privateKey: Buffer) => void,
): void;
export function generateKeyPair(
  type: "x448",
  options: X448KeyPairKeyObjectOptions | undefined,
  callback: (
    err: Error | null,
    publicKey: KeyObject,
    privateKey: KeyObject,
  ) => void,
): void;
export function generateKeyPair(
  type: KeyType,
  options: unknown,
  callback: (
    err: Error | null,
    publicKey: any,
    privateKey: any,
  ) => void,
) {
  createJob(kAsync, type, options).then(([privateKey, publicKey]) => {
    privateKey = new PrivateKeyObject(setOwnedKey(privateKey), { type });
    publicKey = new PublicKeyObject(setOwnedKey(publicKey), { type });

    if (typeof options === "object" && options !== null) {
      const { publicKeyEncoding, privateKeyEncoding } = options as any;

      if (publicKeyEncoding) {
        publicKey = publicKey.export(publicKeyEncoding);
      }

      if (privateKeyEncoding) {
        privateKey = privateKey.export(privateKeyEncoding);
      }
    }

    callback(null, publicKey, privateKey);
  }).catch((err) => {
    callback(err, null, null);
  });
}

export interface KeyPairKeyObjectResult {
  publicKey: KeyObject;
  privateKey: KeyObject;
}

export interface KeyPairSyncResult<
  T1 extends string | Buffer,
  T2 extends string | Buffer,
> {
  publicKey: T1;
  privateKey: T2;
}

export function generateKeyPairSync(
  type: "rsa",
  options: RSAKeyPairOptions<"pem", "pem">,
): KeyPairSyncResult<string, string>;
export function generateKeyPairSync(
  type: "rsa",
  options: RSAKeyPairOptions<"pem", "der">,
): KeyPairSyncResult<string, Buffer>;
export function generateKeyPairSync(
  type: "rsa",
  options: RSAKeyPairOptions<"der", "pem">,
): KeyPairSyncResult<Buffer, string>;
export function generateKeyPairSync(
  type: "rsa",
  options: RSAKeyPairOptions<"der", "der">,
): KeyPairSyncResult<Buffer, Buffer>;
export function generateKeyPairSync(
  type: "rsa",
  options: RSAKeyPairKeyObjectOptions,
): KeyPairKeyObjectResult;
export function generateKeyPairSync(
  type: "rsa-pss",
  options: RSAPSSKeyPairOptions<"pem", "pem">,
): KeyPairSyncResult<string, string>;
export function generateKeyPairSync(
  type: "rsa-pss",
  options: RSAPSSKeyPairOptions<"pem", "der">,
): KeyPairSyncResult<string, Buffer>;
export function generateKeyPairSync(
  type: "rsa-pss",
  options: RSAPSSKeyPairOptions<"der", "pem">,
): KeyPairSyncResult<Buffer, string>;
export function generateKeyPairSync(
  type: "rsa-pss",
  options: RSAPSSKeyPairOptions<"der", "der">,
): KeyPairSyncResult<Buffer, Buffer>;
export function generateKeyPairSync(
  type: "rsa-pss",
  options: RSAPSSKeyPairKeyObjectOptions,
): KeyPairKeyObjectResult;
export function generateKeyPairSync(
  type: "dsa",
  options: DSAKeyPairOptions<"pem", "pem">,
): KeyPairSyncResult<string, string>;
export function generateKeyPairSync(
  type: "dsa",
  options: DSAKeyPairOptions<"pem", "der">,
): KeyPairSyncResult<string, Buffer>;
export function generateKeyPairSync(
  type: "dsa",
  options: DSAKeyPairOptions<"der", "pem">,
): KeyPairSyncResult<Buffer, string>;
export function generateKeyPairSync(
  type: "dsa",
  options: DSAKeyPairOptions<"der", "der">,
): KeyPairSyncResult<Buffer, Buffer>;
export function generateKeyPairSync(
  type: "dsa",
  options: DSAKeyPairKeyObjectOptions,
): KeyPairKeyObjectResult;
export function generateKeyPairSync(
  type: "ec",
  options: ECKeyPairOptions<"pem", "pem">,
): KeyPairSyncResult<string, string>;
export function generateKeyPairSync(
  type: "ec",
  options: ECKeyPairOptions<"pem", "der">,
): KeyPairSyncResult<string, Buffer>;
export function generateKeyPairSync(
  type: "ec",
  options: ECKeyPairOptions<"der", "pem">,
): KeyPairSyncResult<Buffer, string>;
export function generateKeyPairSync(
  type: "ec",
  options: ECKeyPairOptions<"der", "der">,
): KeyPairSyncResult<Buffer, Buffer>;
export function generateKeyPairSync(
  type: "ec",
  options: ECKeyPairKeyObjectOptions,
): KeyPairKeyObjectResult;
export function generateKeyPairSync(
  type: "ed25519",
  options: ED25519KeyPairOptions<"pem", "pem">,
): KeyPairSyncResult<string, string>;
export function generateKeyPairSync(
  type: "ed25519",
  options: ED25519KeyPairOptions<"pem", "der">,
): KeyPairSyncResult<string, Buffer>;
export function generateKeyPairSync(
  type: "ed25519",
  options: ED25519KeyPairOptions<"der", "pem">,
): KeyPairSyncResult<Buffer, string>;
export function generateKeyPairSync(
  type: "ed25519",
  options: ED25519KeyPairOptions<"der", "der">,
): KeyPairSyncResult<Buffer, Buffer>;
export function generateKeyPairSync(
  type: "ed25519",
  options?: ED25519KeyPairKeyObjectOptions,
): KeyPairKeyObjectResult;
export function generateKeyPairSync(
  type: "ed448",
  options: ED448KeyPairOptions<"pem", "pem">,
): KeyPairSyncResult<string, string>;
export function generateKeyPairSync(
  type: "ed448",
  options: ED448KeyPairOptions<"pem", "der">,
): KeyPairSyncResult<string, Buffer>;
export function generateKeyPairSync(
  type: "ed448",
  options: ED448KeyPairOptions<"der", "pem">,
): KeyPairSyncResult<Buffer, string>;
export function generateKeyPairSync(
  type: "ed448",
  options: ED448KeyPairOptions<"der", "der">,
): KeyPairSyncResult<Buffer, Buffer>;
export function generateKeyPairSync(
  type: "ed448",
  options?: ED448KeyPairKeyObjectOptions,
): KeyPairKeyObjectResult;
export function generateKeyPairSync(
  type: "x25519",
  options: X25519KeyPairOptions<"pem", "pem">,
): KeyPairSyncResult<string, string>;
export function generateKeyPairSync(
  type: "x25519",
  options: X25519KeyPairOptions<"pem", "der">,
): KeyPairSyncResult<string, Buffer>;
export function generateKeyPairSync(
  type: "x25519",
  options: X25519KeyPairOptions<"der", "pem">,
): KeyPairSyncResult<Buffer, string>;
export function generateKeyPairSync(
  type: "x25519",
  options: X25519KeyPairOptions<"der", "der">,
): KeyPairSyncResult<Buffer, Buffer>;
export function generateKeyPairSync(
  type: "x25519",
  options?: X25519KeyPairKeyObjectOptions,
): KeyPairKeyObjectResult;
export function generateKeyPairSync(
  type: "x448",
  options: X448KeyPairOptions<"pem", "pem">,
): KeyPairSyncResult<string, string>;
export function generateKeyPairSync(
  type: "x448",
  options: X448KeyPairOptions<"pem", "der">,
): KeyPairSyncResult<string, Buffer>;
export function generateKeyPairSync(
  type: "x448",
  options: X448KeyPairOptions<"der", "pem">,
): KeyPairSyncResult<Buffer, string>;
export function generateKeyPairSync(
  type: "x448",
  options: X448KeyPairOptions<"der", "der">,
): KeyPairSyncResult<Buffer, Buffer>;
export function generateKeyPairSync(
  type: "x448",
  options?: X448KeyPairKeyObjectOptions,
): KeyPairKeyObjectResult;
export function generateKeyPairSync(
  type: KeyType,
  options: unknown,
):
  | KeyPairKeyObjectResult
  | KeyPairSyncResult<string | Buffer, string | Buffer> {
  let [privateKey, publicKey] = createJob(kSync, type, options);

  privateKey = new PrivateKeyObject(setOwnedKey(privateKey), { type });
  publicKey = new PublicKeyObject(setOwnedKey(publicKey), { type });

  if (typeof options === "object" && options !== null) {
    const { publicKeyEncoding, privateKeyEncoding } = options as any;

    if (publicKeyEncoding) {
      publicKey = publicKey.export(publicKeyEncoding);
    }

    if (privateKeyEncoding) {
      privateKey = privateKey.export(privateKeyEncoding);
    }
  }

  return { publicKey, privateKey };
}

const kSync = 0;
const kAsync = 1;

function createJob(mode, type, options) {
  validateString(type, "type");

  if (options !== undefined) {
    validateObject(options, "options");
  }

  switch (type) {
    case "rsa":
    case "rsa-pss": {
      validateObject(options, "options");
      const { modulusLength } = options;
      validateUint32(modulusLength, "options.modulusLength");

      let { publicExponent } = options;
      if (publicExponent == null) {
        publicExponent = 0x10001;
      } else {
        validateUint32(publicExponent, "options.publicExponent");
      }

      if (type === "rsa") {
        if (mode === kSync) {
          return op_node_generate_rsa(
            modulusLength,
            publicExponent,
          );
        } else {
          return op_node_generate_rsa_async(
            modulusLength,
            publicExponent,
          );
        }
      }

      const {
        hash,
        mgf1Hash,
        hashAlgorithm,
        mgf1HashAlgorithm,
        saltLength,
      } = options;

      if (saltLength !== undefined) {
        validateInt32(saltLength, "options.saltLength", 0);
      }
      if (hashAlgorithm !== undefined) {
        validateString(hashAlgorithm, "options.hashAlgorithm");
      }
      if (mgf1HashAlgorithm !== undefined) {
        validateString(mgf1HashAlgorithm, "options.mgf1HashAlgorithm");
      }
      if (hash !== undefined) {
        process.emitWarning(
          '"options.hash" is deprecated, ' +
            'use "options.hashAlgorithm" instead.',
          "DeprecationWarning",
          "DEP0154",
        );
        validateString(hash, "options.hash");
        if (hashAlgorithm && hash !== hashAlgorithm) {
          throw new ERR_INVALID_ARG_VALUE("options.hash", hash);
        }
      }
      if (mgf1Hash !== undefined) {
        process.emitWarning(
          '"options.mgf1Hash" is deprecated, ' +
            'use "options.mgf1HashAlgorithm" instead.',
          "DeprecationWarning",
          "DEP0154",
        );
        validateString(mgf1Hash, "options.mgf1Hash");
        if (mgf1HashAlgorithm && mgf1Hash !== mgf1HashAlgorithm) {
          throw new ERR_INVALID_ARG_VALUE("options.mgf1Hash", mgf1Hash);
        }
      }

      if (mode === kSync) {
        return op_node_generate_rsa(
          modulusLength,
          publicExponent,
        );
      } else {
        return op_node_generate_rsa_async(
          modulusLength,
          publicExponent,
        );
      }
    }
    case "dsa": {
      validateObject(options, "options");
      const { modulusLength } = options;
      validateUint32(modulusLength, "options.modulusLength");

      let { divisorLength } = options;
      if (divisorLength == null) {
        divisorLength = 256;
      } else {
        validateInt32(divisorLength, "options.divisorLength", 0);
      }

      if (mode === kSync) {
        return op_node_dsa_generate(modulusLength, divisorLength);
      }
      return op_node_dsa_generate_async(
        modulusLength,
        divisorLength,
      );
    }
    case "ec": {
      validateObject(options, "options");
      const { namedCurve } = options;
      validateString(namedCurve, "options.namedCurve");
      const { paramEncoding } = options;
      if (paramEncoding == null || paramEncoding === "named") {
        // pass.
      } else if (paramEncoding === "explicit") {
        // TODO(@littledivy): Explicit param encoding is very rarely used, and not supported by the ring crate.
        throw new TypeError("Explicit encoding is not supported");
      } else {
        throw new ERR_INVALID_ARG_VALUE("options.paramEncoding", paramEncoding);
      }

      if (mode === kSync) {
        return op_node_ec_generate(namedCurve);
      } else {
        return op_node_ec_generate_async(namedCurve);
      }
    }
    case "ed25519": {
      if (mode === kSync) {
        return op_node_ed25519_generate();
      }
      return op_node_ed25519_generate_async();
    }
    case "x25519": {
      if (mode === kSync) {
        return op_node_x25519_generate();
      }
      return op_node_x25519_generate_async();
    }
    case "ed448":
    case "x448": {
      notImplemented(type);
      break;
    }
    case "dh": {
      validateObject(options, "options");
      const { group, primeLength, prime, generator } = options;
      if (group != null) {
        if (prime != null) {
          throw new ERR_INCOMPATIBLE_OPTION_PAIR("group", "prime");
        }
        if (primeLength != null) {
          throw new ERR_INCOMPATIBLE_OPTION_PAIR("group", "primeLength");
        }
        if (generator != null) {
          throw new ERR_INCOMPATIBLE_OPTION_PAIR("group", "generator");
        }

        validateString(group, "options.group");

        if (mode === kSync) {
          return op_node_dh_generate_group(group);
        } else {
          return op_node_dh_generate_group_async(group);
        }
      }

      if (prime != null) {
        if (primeLength != null) {
          throw new ERR_INCOMPATIBLE_OPTION_PAIR("prime", "primeLength");
        }

        validateBuffer(prime, "options.prime");
      } else if (primeLength != null) {
        validateInt32(primeLength, "options.primeLength", 0);
      } else {
        throw new ERR_MISSING_OPTION(
          "At least one of the group, prime, or primeLength options",
        );
      }

      if (generator != null) {
        validateInt32(generator, "options.generator", 0);
      }

      const g = generator == null ? 2 : generator;

      if (mode === kSync) {
        return op_node_dh_generate(prime, primeLength ?? 0, g);
      } else {
        return op_node_dh_generate_async(
          prime,
          primeLength ?? 0,
          g,
        );
      }
    }
    default:
      // Fall through
  }
  throw new ERR_INVALID_ARG_VALUE("type", type, "must be a supported key type");
}

export default {
  generateKey,
  generateKeySync,
  generateKeyPair,
  generateKeyPairSync,
};