aes-cmac/lib/aes-cmac.cjs.map

AES-CMAC implementation in typescript

{"version":3,"file":"aes-cmac.cjs","sources":["../src/BufferTools.ts","../src/AesCmac.ts"],"sourcesContent":["export class BufferTools {\n  public static bitShiftLeft(input: Uint8Array): Uint8Array<ArrayBuffer> {\n    const output = new Uint8Array(input.length);\n    let overflow = 0;\n    for (let i = input.length - 1; i >= 0; i--) {\n      const byte = input[i]!;\n      output[i] = (byte << 1) | overflow;\n      overflow = byte & 0x80 ? 1 : 0;\n    }\n    return output;\n  }\n\n  public static xor(a: Uint8Array, b: Uint8Array): Uint8Array<ArrayBuffer> {\n    const length = Math.min(a.length, b.length);\n    const output = new Uint8Array(length);\n    for (let i = 0; i < length; i++) {\n      output[i] = a[i]! ^ b[i]!;\n    }\n    return output;\n  }\n\n  public static toBinaryString(input: Uint8Array): string {\n    let binary = \"\";\n    for (let i = 0; i < input.length; i++) {\n      for (let b = 7; b >= 0; b--) {\n        const byte = input[i]!;\n        binary += byte & (1 << b) ? \"1\" : \"0\";\n      }\n    }\n    return binary;\n  }\n}\n","import type { webcrypto } from \"node:crypto\";\nimport { BufferTools } from \"./BufferTools\";\n\nexport class AesCmac {\n  private readonly blockSize = 16;\n  private readonly supportedLengths = [16, 24, 32];\n\n  private subkeys?: { key1: Uint8Array; key2: Uint8Array };\n  private key: webcrypto.CryptoKey | PromiseLike<webcrypto.CryptoKey>;\n\n  public constructor(key: Uint8Array) {\n    if (key instanceof Uint8Array === false) {\n      throw new Error(\"The key must be provided as a Uint8Array.\");\n    }\n\n    if (this.supportedLengths.includes(key.length) === false) {\n      throw new Error(\"Key size must be 128, 192, or 256 bits.\");\n    }\n\n    // note that this is a Promise<CryptoKey> at this point, which we await in aes()\n    this.key = crypto.subtle.importKey(\"raw\", key, \"AES-CBC\", false, [\"encrypt\"]);\n  }\n\n  private async generateSubkeys(): Promise<{\n    key1: Uint8Array;\n    key2: Uint8Array;\n  }> {\n    const rb = Uint8Array.from([\n      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,\n      0x87,\n    ]);\n\n    const z = new Uint8Array(this.blockSize);\n    const l = await this.aes(z);\n\n    let key1 = BufferTools.bitShiftLeft(l);\n    if (l[0]! & 0x80) {\n      key1 = BufferTools.xor(key1, rb);\n    }\n\n    let key2 = BufferTools.bitShiftLeft(key1);\n    if (key1[0]! & 0x80) {\n      key2 = BufferTools.xor(key2, rb);\n    }\n\n    return { key1, key2 };\n  }\n\n  public async getSubKeys(): Promise<{ key1: Uint8Array; key2: Uint8Array }> {\n    // subkeys are generated lazily because we cannot await in a constructor\n    if (!this.subkeys) {\n      this.subkeys = await this.generateSubkeys();\n    }\n\n    const key1 = new Uint8Array(this.blockSize);\n    key1.set(this.subkeys.key1);\n\n    const key2 = new Uint8Array(this.blockSize);\n    key2.set(this.subkeys.key2);\n\n    return { key1, key2 };\n  }\n\n  public async calculate(message: Uint8Array): Promise<Uint8Array> {\n    if (message instanceof Uint8Array === false) {\n      throw new Error(\"The message must be provided as a Uint8Array.\");\n    }\n\n    const blockCount = this.getBlockCount(message);\n\n    let x = new Uint8Array(this.blockSize);\n    let y = new Uint8Array(0);\n\n    for (let i = 0; i < blockCount - 1; i++) {\n      const from = i * this.blockSize;\n      const block = message.slice(from, from + this.blockSize);\n      y = BufferTools.xor(x, block);\n      x = await this.aes(y);\n    }\n\n    y = BufferTools.xor(x, await this.getLastBlock(message));\n    x = await this.aes(y);\n\n    return x;\n  }\n\n  private getBlockCount(message: Uint8Array): number {\n    const blockCount = Math.ceil(message.length / this.blockSize);\n    return blockCount === 0 ? 1 : blockCount;\n  }\n\n  private async aes(message: Uint8Array): Promise<Uint8Array<ArrayBuffer>> {\n    const iv = new Uint8Array(this.blockSize);\n\n    /// because constructors cannot be async, we await the key import here\n    if (\"then\" in this.key) {\n      this.key = await this.key;\n    }\n\n    const aesCiphertext = (await crypto.subtle.encrypt(\n      { name: \"AES-CBC\", iv },\n      this.key,\n      message,\n    )) as ArrayBuffer;\n\n    return new Uint8Array(aesCiphertext.slice(0, 16));\n  }\n\n  private async getLastBlock(message: Uint8Array): Promise<Uint8Array> {\n    if (!this.subkeys) {\n      this.subkeys = await this.generateSubkeys();\n    }\n\n    const blockCount = this.getBlockCount(message);\n    const paddedBlock = this.padding(message, blockCount - 1);\n\n    let complete = false;\n    if (message.length > 0) {\n      complete = message.length % this.blockSize === 0;\n    }\n\n    const key = complete ? this.subkeys.key1 : this.subkeys.key2;\n    return BufferTools.xor(paddedBlock, key);\n  }\n\n  private padding(message: Uint8Array, blockIndex: number): Uint8Array {\n    const block = new Uint8Array(this.blockSize);\n\n    const from = blockIndex * this.blockSize;\n\n    const slice = message.slice(from, from + this.blockSize);\n    block.set(slice);\n\n    if (slice.length !== this.blockSize) {\n      block[slice.length] = 0x80;\n    }\n\n    return block;\n  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