tink-crypto
Version:
A multi-language, cross-platform library that provides cryptographic APIs that are secure, easy to use correctly, and hard(er) to misuse.
116 lines • 14.4 kB
JavaScript
/**
* @license
* Copyright 2022 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 { fromRawKey as hmacFromRawKey } from '../../../subtle/hmac';
import * as validators from '../../../subtle/validators';
import * as hpkeUtil from './hpke_util';
/**
* HKDF HPKE KDF variant.
* @see https://www.rfc-editor.org/rfc/rfc9180.html#section-4.1-3
*/
export class HkdfHpkeKdf {
constructor(hashFunction) {
this.hashFunction = hashFunction;
}
labeledExtract({ ikm, ikmLabel, suiteId, salt }) {
return __awaiter(this, void 0, void 0, function* () {
return yield this.extract(hpkeUtil.labelIkm({ ikmLabel, ikm, suiteId }), salt);
});
}
labeledExpand({ prk, info, infoLabel, suiteId, length }) {
return __awaiter(this, void 0, void 0, function* () {
return yield this.expand(prk, hpkeUtil.labelInfo({ infoLabel, info, suiteId, length }), length);
});
}
extractAndExpand({ ikm, ikmLabel, info, infoLabel, suiteId, length, salt }) {
return __awaiter(this, void 0, void 0, function* () {
const prk = yield this.extract(hpkeUtil.labelIkm({ ikmLabel, ikm, suiteId }), salt);
return yield this.expand(prk, hpkeUtil.labelInfo({ infoLabel, info, suiteId, length }), length);
});
}
/**
* Copied from `javascript/subtle/hkdf`'s `compute` function
*/
expand(prk, info, length) {
return __awaiter(this, void 0, void 0, function* () {
if (!Number.isInteger(length)) {
throw new SecurityException('length must be an integer');
}
if (length <= 0) {
throw new SecurityException('length must be positive');
}
const digestSize = this.getMacLength();
if (length > 255 * digestSize) {
throw new SecurityException('length too large');
}
validators.requireUint8Array(info);
const hmac = yield hmacFromRawKey(this.hashFunction, prk, digestSize);
let ctr = 1;
let pos = 0;
let digest = new Uint8Array(0);
const result = new Uint8Array(length);
while (true) {
const input = new Uint8Array(digest.length + info.length + 1);
input.set(digest, 0);
input.set(info, digest.length);
input[input.length - 1] = ctr;
digest = yield hmac.computeMac(input);
if (pos + digest.length < length) {
result.set(digest, pos);
pos += digest.length;
ctr++;
}
else {
result.set(digest.subarray(0, length - pos), pos);
break;
}
}
return result;
});
}
/**
* Copied from `javascript/subtle/hkdf`'s `compute` function
*/
extract(ikm, salt) {
return __awaiter(this, void 0, void 0, function* () {
validators.requireUint8Array(ikm);
const digestSize = this.getMacLength();
if (!(salt === null || salt === void 0 ? void 0 : salt.length)) {
salt = new Uint8Array(digestSize);
}
validators.requireUint8Array(salt);
const hmac = yield hmacFromRawKey(this.hashFunction, salt, digestSize);
const prk = yield hmac.computeMac(ikm);
return prk;
});
}
getKdfId() {
switch (this.hashFunction) {
case 'SHA-256':
return hpkeUtil.HKDF_SHA256_KDF_ID;
case 'SHA-512':
return hpkeUtil.HKDF_SHA512_KDF_ID;
}
}
getMacLength() {
switch (this.hashFunction) {
case 'SHA-256':
return 32;
case 'SHA-512':
return 64;
}
}
}
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* @license\n * Copyright 2022 Google LLC\n * SPDX-License-Identifier: Apache-2.0\n */\n\nimport {SecurityException} from '../../../exception/security_exception';\nimport {fromRawKey as hmacFromRawKey} from '../../../subtle/hmac';\nimport * as validators from '../../../subtle/validators';\n\nimport {HpkeKdf} from './hpke_kdf';\nimport * as hpkeUtil from './hpke_util';\n\n/**\n * HKDF HPKE KDF variant.\n * @see https://www.rfc-editor.org/rfc/rfc9180.html#section-4.1-3\n */\nexport class HkdfHpkeKdf implements HpkeKdf {\n  constructor(private readonly hashFunction: 'SHA-256'|'SHA-512') {}\n\n  async labeledExtract({ikm, ikmLabel, suiteId, salt}: {\n    ikm: Uint8Array,\n    ikmLabel: string,\n    suiteId: Uint8Array,\n    salt?: Uint8Array\n  }): Promise<Uint8Array> {\n    return await this.extract(\n        hpkeUtil.labelIkm({ikmLabel, ikm, suiteId}), salt);\n  }\n\n  async labeledExpand({prk, info, infoLabel, suiteId, length}: {\n    prk: Uint8Array,\n    info: Uint8Array,\n    infoLabel: string,\n    suiteId: Uint8Array,\n    length: number\n  }): Promise<Uint8Array> {\n    return await this.expand(\n        prk, hpkeUtil.labelInfo({infoLabel, info, suiteId, length}), length);\n  }\n\n  async extractAndExpand(\n      {ikm, ikmLabel, info, infoLabel, suiteId, length, salt}: {\n        ikm: Uint8Array,\n        ikmLabel: string,\n        info: Uint8Array,\n        infoLabel: string,\n        suiteId: Uint8Array,\n        length: number,\n        salt?: Uint8Array\n      }): Promise<Uint8Array> {\n    const prk: Uint8Array =\n        await this.extract(hpkeUtil.labelIkm({ikmLabel, ikm, suiteId}), salt);\n    return await this.expand(\n        prk, hpkeUtil.labelInfo({infoLabel, info, suiteId, length}), length);\n  }\n\n  /**\n   * Copied from `javascript/subtle/hkdf`'s `compute` function\n   */\n  private async expand(prk: Uint8Array, info: Uint8Array, length: number):\n      Promise<Uint8Array> {\n    if (!Number.isInteger(length)) {\n      throw new SecurityException('length must be an integer');\n    }\n    if (length <= 0) {\n      throw new SecurityException('length must be positive');\n    }\n\n    const digestSize = this.getMacLength();\n\n    if (length > 255 * digestSize) {\n      throw new SecurityException('length too large');\n    }\n    validators.requireUint8Array(info);\n\n    const hmac = await hmacFromRawKey(this.hashFunction, prk, digestSize);\n    let ctr = 1;\n    let pos = 0;\n    let digest = new Uint8Array(0);\n    const result = new Uint8Array(length);\n    while (true) {\n      const input = new Uint8Array(digest.length + info.length + 1);\n      input.set(digest, 0);\n      input.set(info, digest.length);\n      input[input.length - 1] = ctr;\n      digest = await hmac.computeMac(input);\n      if (pos + digest.length < length) {\n        result.set(digest, pos);\n        pos += digest.length;\n        ctr++;\n      } else {\n        result.set(digest.subarray(0, length - pos), pos);\n        break;\n      }\n    }\n    return result;\n  }\n\n  /**\n   * Copied from `javascript/subtle/hkdf`'s `compute` function\n   */\n  private async extract(ikm: Uint8Array, salt?: Uint8Array):\n      Promise<Uint8Array> {\n    validators.requireUint8Array(ikm);\n    const digestSize = this.getMacLength();\n    if (!salt?.length) {\n      salt = new Uint8Array(digestSize);\n    }\n    validators.requireUint8Array(salt);\n\n    const hmac = await hmacFromRawKey(this.hashFunction, salt, digestSize);\n    const prk = await hmac.computeMac(ikm);\n\n    return prk;\n  }\n\n  getKdfId(): Uint8Array {\n    switch (this.hashFunction) {\n      case 'SHA-256':\n        return hpkeUtil.HKDF_SHA256_KDF_ID;\n      case 'SHA-512':\n        return hpkeUtil.HKDF_SHA512_KDF_ID;\n    }\n  }\n\n  getMacLength(): number {\n    switch (this.hashFunction) {\n      case 'SHA-256':\n        return 32;\n      case 'SHA-512':\n        return 64;\n    }\n  }\n}\n"]}