UNPKG

tink-crypto

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A multi-language, cross-platform library that provides cryptographic APIs that are secure, easy to use correctly, and hard(er) to misuse.

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/** * @license * Copyright 2023 Google LLC * SPDX-License-Identifier: Apache-2.0 */ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) { function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); } return new (P || (P = Promise))(function (resolve, reject) { function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } } function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } } function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); } step((generator = generator.apply(thisArg, _arguments || [])).next()); }); }; import { SecurityException } from '../../../exception/security_exception'; import { PbHpkeKeyFormat, PbHpkePrivateKey, PbHpkePublicKey, PbKeyData } from '../../../internal/proto'; import * as bytes from '../../../subtle/bytes'; import * as ellipticCurves from '../../../subtle/elliptic_curves'; import { HybridDecrypt } from '../hybrid_decrypt'; import { HpkeDecrypt } from './hpke_decrypt'; import { HpkePublicKeyManager } from './hpke_public_key_manager'; import * as hpkeUtil from './hpke_util'; import * as hpkeValidators from './hpke_validators'; const VERSION = 0; /** * A container for methods that generate new HPKE key pairs. * These methods are separate from the KeyManager as their functionality is * independent of the primitive of the corresponding KeyManager. * @final */ class HpkePrivateKeyFactory { /** * Generates a new random HPKE key according to 'keyFormat'. * * @param keyFormat is either a KeyFormat * proto or a serialized KeyFormat proto * @return the new generated HPKE private key */ newKey(keyFormat) { return __awaiter(this, void 0, void 0, function* () { if (!keyFormat) { throw new SecurityException('Key format must be non-null.'); } const keyFormatProto = HpkePrivateKeyFactory.getKeyFormatProto(keyFormat); hpkeValidators.validateKeyFormat(keyFormatProto); const params = keyFormatProto.getParams(); if (!params) { throw new SecurityException('Params not set'); } const curveType = hpkeUtil.nistHpkeKemToCurve(params.getKem()); const curveName = ellipticCurves.curveToString(curveType); const keyPair = yield ellipticCurves.generateKeyPair('ECDH', curveName); const jsonPrivateKey = yield ellipticCurves.exportCryptoKey(keyPair.privateKey); const publicKeyBytes = yield hpkeUtil.getByteArrayFromPublicKey(keyPair.publicKey); const publicKeyProto = (new PbHpkePublicKey()) .setVersion(HpkePublicKeyManager.VERSION) .setParams(params) .setPublicKey(publicKeyBytes); const { d } = jsonPrivateKey; if (d === undefined) { throw new SecurityException('d must be set'); } return (new PbHpkePrivateKey()) .setVersion(VERSION) .setPublicKey(publicKeyProto) .setPrivateKey(bytes.fromBase64(d, true)); }); } /** * Generates a new random HPKE key based on the "serialized_key_format" and * returns it as a KeyData proto. */ newKeyData(serializedKeyFormat) { return __awaiter(this, void 0, void 0, function* () { const key = yield this.newKey(serializedKeyFormat); const keyData = (new PbKeyData()) .setTypeUrl(HpkePrivateKeyManager.KEY_TYPE) .setValue(key.serializeBinary()) .setKeyMaterialType(PbKeyData.KeyMaterialType.ASYMMETRIC_PRIVATE); return keyData; }); } /** * Returns an HPKE public key data extracted from the given serialized HPKE * private key. */ getPublicKeyData(serializedPrivateKey) { const privateKey = deserializePrivateKey(serializedPrivateKey); const publicKey = privateKey.getPublicKey(); if (!publicKey) { throw new SecurityException('Public key not set'); } const publicKeyData = (new PbKeyData()) .setValue(publicKey.serializeBinary()) .setTypeUrl(HpkePublicKeyManager.KEY_TYPE) .setKeyMaterialType(PbKeyData.KeyMaterialType.ASYMMETRIC_PUBLIC); return publicKeyData; } /** * The input keyFormat is either deserialized (in case that the input is * Uint8Array) or checked to be an HpkeKeyFormat-proto (otherwise). */ static getKeyFormatProto(keyFormat) { if (keyFormat instanceof Uint8Array) { return HpkePrivateKeyFactory.deserializeKeyFormat(keyFormat); } else if (keyFormat instanceof PbHpkeKeyFormat) { return keyFormat; } else { throw new SecurityException('Expected ' + HpkePrivateKeyManager.KEY_TYPE + ' key format proto.'); } } static deserializeKeyFormat(keyFormat) { let keyFormatProto; try { keyFormatProto = PbHpkeKeyFormat.deserializeBinary(keyFormat); } catch (e) { throw new SecurityException('Input cannot be parsed as ' + HpkePrivateKeyManager.KEY_TYPE + ' key format proto.'); } /** * Throws the same generic error to avoid discrepancies between different * versions. */ if (!keyFormatProto.getParams()) { throw new SecurityException('Input cannot be parsed as ' + HpkePrivateKeyManager.KEY_TYPE + ' key format proto.'); } return keyFormatProto; } } /** * Key manager that generates new {@link HpkePrivateKey} keys and produces new * instances of {@link HpkeDecrypt} primitives. * * @final */ export class HpkePrivateKeyManager { constructor() { this.keyFactory = new HpkePrivateKeyFactory(); } /** * Constructs an instance of the 'HybridDecrypt' primitive for a given HPKE * key. */ getPrimitive(primitiveType, key) { return __awaiter(this, void 0, void 0, function* () { if (primitiveType !== this.getPrimitiveType()) { throw new SecurityException('Requested primitive type which is not ' + 'supported by this key manager.'); } const keyProto = HpkePrivateKeyManager.getKeyProto(key); hpkeValidators.validatePrivateKey(keyProto, VERSION, HpkePublicKeyManager.VERSION); return HpkeDecrypt.createHpkeDecrypt(keyProto); }); } /** Returns true if this KeyManager supports 'HpkePrivateKey' key type. */ doesSupport(keyType) { return keyType === this.getKeyType(); } /** Returns the URL which identifies the keys managed by this KeyManager. */ getKeyType() { return HpkePrivateKeyManager.KEY_TYPE; } /** * Returns the type of primitive which can be generated by this KeyManager, * i.e. 'HybridDecrypt' */ getPrimitiveType() { return HpkePrivateKeyManager.SUPPORTED_PRIMITIVE; } getVersion() { return VERSION; } getKeyFactory() { return this.keyFactory; } static getKeyProto(keyMaterial) { if (keyMaterial instanceof PbKeyData) { return HpkePrivateKeyManager.getKeyProtoFromKeyData(keyMaterial); } if (keyMaterial instanceof PbHpkePrivateKey) { return keyMaterial; } throw new SecurityException('Key type is not supported. This key ' + 'manager supports ' + HpkePrivateKeyManager.KEY_TYPE + '.'); } static getKeyProtoFromKeyData(keyData) { if (keyData.getTypeUrl() !== HpkePrivateKeyManager.KEY_TYPE) { throw new SecurityException('Key type ' + keyData.getTypeUrl() + ' is not supported. This key manager supports ' + HpkePrivateKeyManager.KEY_TYPE + '.'); } return deserializePrivateKey(keyData.getValue()); } } HpkePrivateKeyManager.SUPPORTED_PRIMITIVE = HybridDecrypt; HpkePrivateKeyManager.KEY_TYPE = 'type.googleapis.com/google.crypto.tink.HpkePrivateKey'; /** Returns an HPKE private key instance for the given key serialization */ function deserializePrivateKey(serializedPrivateKey) { let key; try { key = PbHpkePrivateKey.deserializeBinary(serializedPrivateKey); } catch (e) { throw new SecurityException('Input cannot be parsed as ' + HpkePrivateKeyManager.KEY_TYPE + ' key-proto.'); } /** * Throws the same generic error to avoid discrepancies between different * versions. */ if (!key.getPublicKey() || !key.getPrivateKey()) { throw new SecurityException('Input cannot be parsed as ' + HpkePrivateKeyManager.KEY_TYPE + ' key-proto.'); } return key; } //# 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* @license\n * Copyright 2023 Google LLC\n * SPDX-License-Identifier: Apache-2.0\n */\n\nimport {SecurityException} from '../../../exception/security_exception';\nimport * as keyManager from '../../../internal/key_manager';\nimport {PbHpkeKeyFormat, PbHpkeParams, PbHpkePrivateKey, PbHpkePublicKey, PbKeyData, PbMessage} from '../../../internal/proto';\nimport {ProtoBytes} from '../../../internal/proto_shims';\nimport * as util from '../../../internal/util';\nimport * as bytes from '../../../subtle/bytes';\nimport * as ellipticCurves from '../../../subtle/elliptic_curves';\nimport {HybridDecrypt} from '../hybrid_decrypt';\n\nimport {HpkeDecrypt} from './hpke_decrypt';\nimport {HpkePublicKeyManager} from './hpke_public_key_manager';\nimport * as hpkeUtil from './hpke_util';\nimport * as hpkeValidators from './hpke_validators';\n\nconst VERSION = 0;\n\n/**\n * A container for methods that generate new HPKE key pairs.\n * These methods are separate from the KeyManager as their functionality is\n * independent of the primitive of the corresponding KeyManager.\n * @final\n */\nclass HpkePrivateKeyFactory implements keyManager.PrivateKeyFactory {\n  /**\n   * Generates a new random HPKE key according to 'keyFormat'.\n   *\n   * @param keyFormat is either a KeyFormat\n   *     proto or a serialized KeyFormat proto\n   * @return the new generated HPKE private key\n   */\n  async newKey(keyFormat: PbMessage|Uint8Array): Promise<PbHpkePrivateKey> {\n    if (!keyFormat) {\n      throw new SecurityException('Key format must be non-null.');\n    }\n    const keyFormatProto: PbHpkeKeyFormat =\n        HpkePrivateKeyFactory.getKeyFormatProto(keyFormat);\n    hpkeValidators.validateKeyFormat(keyFormatProto);\n    const params: PbHpkeParams|undefined = keyFormatProto.getParams();\n    if (!params) {\n      throw new SecurityException('Params not set');\n    }\n    const curveType: ellipticCurves.CurveType.P256|\n        ellipticCurves.CurveType.P521 =\n        hpkeUtil.nistHpkeKemToCurve(params.getKem());\n    const curveName = ellipticCurves.curveToString(curveType);\n    const keyPair: CryptoKeyPair =\n        await ellipticCurves.generateKeyPair('ECDH', curveName);\n    const jsonPrivateKey =\n        await ellipticCurves.exportCryptoKey(keyPair.privateKey);\n\n    const publicKeyBytes =\n        await hpkeUtil.getByteArrayFromPublicKey(keyPair.publicKey);\n\n    const publicKeyProto = (new PbHpkePublicKey())\n                               .setVersion(HpkePublicKeyManager.VERSION)\n                               .setParams(params)\n                               .setPublicKey(publicKeyBytes);\n\n    const {d} = jsonPrivateKey;\n    if (d === undefined) {\n      throw new SecurityException('d must be set');\n    }\n    return (new PbHpkePrivateKey())\n        .setVersion(VERSION)\n        .setPublicKey(publicKeyProto)\n        .setPrivateKey(bytes.fromBase64(d, true));\n  }\n\n  /**\n   * Generates a new random HPKE key based on the \"serialized_key_format\" and\n   * returns it as a KeyData proto.\n   */\n  async newKeyData(serializedKeyFormat: PbMessage|\n                   Uint8Array): Promise<PbKeyData> {\n    const key: PbHpkePrivateKey = await this.newKey(serializedKeyFormat);\n    const keyData =\n        (new PbKeyData())\n            .setTypeUrl(HpkePrivateKeyManager.KEY_TYPE)\n            .setValue(key.serializeBinary())\n            .setKeyMaterialType(PbKeyData.KeyMaterialType.ASYMMETRIC_PRIVATE);\n    return keyData;\n  }\n\n  /**\n   * Returns an HPKE public key data extracted from the given serialized HPKE\n   * private key.\n   */\n  getPublicKeyData(serializedPrivateKey: Uint8Array): PbKeyData {\n    const privateKey: PbHpkePrivateKey =\n        deserializePrivateKey(serializedPrivateKey);\n    const publicKey: PbHpkePublicKey|undefined = privateKey.getPublicKey();\n    if (!publicKey) {\n      throw new SecurityException('Public key not set');\n    }\n    const publicKeyData =\n        (new PbKeyData())\n            .setValue(publicKey.serializeBinary())\n            .setTypeUrl(HpkePublicKeyManager.KEY_TYPE)\n            .setKeyMaterialType(PbKeyData.KeyMaterialType.ASYMMETRIC_PUBLIC);\n    return publicKeyData;\n  }\n\n  /**\n   * The input keyFormat is either deserialized (in case that the input is\n   * Uint8Array) or checked to be an HpkeKeyFormat-proto (otherwise).\n   */\n  private static getKeyFormatProto(keyFormat: PbMessage|\n                                   Uint8Array): PbHpkeKeyFormat {\n    if (keyFormat instanceof Uint8Array) {\n      return HpkePrivateKeyFactory.deserializeKeyFormat(keyFormat);\n    } else if (keyFormat instanceof PbHpkeKeyFormat) {\n      return keyFormat;\n    } else {\n      throw new SecurityException(\n          'Expected ' + HpkePrivateKeyManager.KEY_TYPE + ' key format proto.');\n    }\n  }\n\n  private static deserializeKeyFormat(keyFormat: Uint8Array): PbHpkeKeyFormat {\n    let keyFormatProto: PbHpkeKeyFormat;\n    try {\n      keyFormatProto = PbHpkeKeyFormat.deserializeBinary(keyFormat);\n    } catch (e) {\n      throw new SecurityException(\n          'Input cannot be parsed as ' + HpkePrivateKeyManager.KEY_TYPE +\n          ' key format proto.');\n    }\n    /**\n     * Throws the same generic error to avoid discrepancies between different\n     * versions.\n     */\n    if (!keyFormatProto.getParams()) {\n      throw new SecurityException(\n          'Input cannot be parsed as ' + HpkePrivateKeyManager.KEY_TYPE +\n          ' key format proto.');\n    }\n    return keyFormatProto;\n  }\n}\n\n/**\n * Key manager that generates new {@link HpkePrivateKey} keys and produces new\n * instances of {@link HpkeDecrypt} primitives.\n *\n * @final\n */\nexport class HpkePrivateKeyManager implements\n    keyManager.KeyManager<HybridDecrypt> {\n  private static readonly SUPPORTED_PRIMITIVE = HybridDecrypt;\n  static KEY_TYPE = 'type.googleapis.com/google.crypto.tink.HpkePrivateKey';\n  keyFactory = new HpkePrivateKeyFactory();\n  /**\n   * Constructs an instance of the 'HybridDecrypt' primitive for a given HPKE\n   * key.\n   */\n  async getPrimitive(\n      primitiveType: util.Constructor<HybridDecrypt>,\n      key: PbKeyData|PbMessage): Promise<HybridDecrypt> {\n    if (primitiveType !== this.getPrimitiveType()) {\n      throw new SecurityException(\n          'Requested primitive type which is not ' +\n          'supported by this key manager.');\n    }\n    const keyProto: PbHpkePrivateKey = HpkePrivateKeyManager.getKeyProto(key);\n    hpkeValidators.validatePrivateKey(\n        keyProto, VERSION, HpkePublicKeyManager.VERSION);\n    return HpkeDecrypt.createHpkeDecrypt(keyProto);\n  }\n\n  /** Returns true if this KeyManager supports 'HpkePrivateKey' key type. */\n  doesSupport(keyType: string) {\n    return keyType === this.getKeyType();\n  }\n  /** Returns the URL which identifies the keys managed by this KeyManager. */\n  getKeyType() {\n    return HpkePrivateKeyManager.KEY_TYPE;\n  }\n  /**\n   * Returns the type of primitive which can be generated by this KeyManager,\n   * i.e. 'HybridDecrypt'\n   */\n  getPrimitiveType() {\n    return HpkePrivateKeyManager.SUPPORTED_PRIMITIVE;\n  }\n\n  getVersion() {\n    return VERSION;\n  }\n\n  getKeyFactory() {\n    return this.keyFactory;\n  }\n\n  private static getKeyProto(keyMaterial: PbKeyData|\n                             PbMessage): PbHpkePrivateKey {\n    if (keyMaterial instanceof PbKeyData) {\n      return HpkePrivateKeyManager.getKeyProtoFromKeyData(keyMaterial);\n    }\n    if (keyMaterial instanceof PbHpkePrivateKey) {\n      return keyMaterial;\n    }\n    throw new SecurityException(\n        'Key type is not supported. This key ' +\n        'manager supports ' + HpkePrivateKeyManager.KEY_TYPE + '.');\n  }\n\n  private static getKeyProtoFromKeyData(keyData: PbKeyData): PbHpkePrivateKey {\n    if (keyData.getTypeUrl() !== HpkePrivateKeyManager.KEY_TYPE) {\n      throw new SecurityException(\n          'Key type ' + keyData.getTypeUrl() +\n          ' is not supported. This key manager supports ' +\n          HpkePrivateKeyManager.KEY_TYPE + '.');\n    }\n    return deserializePrivateKey(keyData.getValue());\n  }\n}\n\n/** Returns an HPKE private key instance for the given key serialization */\nfunction deserializePrivateKey(serializedPrivateKey: ProtoBytes):\n    PbHpkePrivateKey {\n  let key: PbHpkePrivateKey;\n  try {\n    key = PbHpkePrivateKey.deserializeBinary(serializedPrivateKey);\n  } catch (e) {\n    throw new SecurityException(\n        'Input cannot be parsed as ' + HpkePrivateKeyManager.KEY_TYPE +\n        ' key-proto.');\n  }\n  /**\n   * Throws the same generic error to avoid discrepancies between different\n   * versions.\n   */\n  if (!key.getPublicKey() || !key.getPrivateKey()) {\n    throw new SecurityException(\n        'Input cannot be parsed as ' + HpkePrivateKeyManager.KEY_TYPE +\n        ' key-proto.');\n  }\n  return key;\n}\n"]}