crypto-es/dist/mode-cfb.cjs.map

A cryptography algorithms library compatible with ES6 and TypeScript

{"version":3,"file":"mode-cfb.cjs","names":["keystream: number[]","BlockCipherMode"],"sources":["../src/mode-cfb.ts"],"sourcesContent":["import {\n  BlockCipherMode,\n  Cipher,\n} from './cipher-core';\n\nfunction generateKeystreamAndEncrypt(\n  this: BlockCipherMode,\n  words: number[],\n  offset: number,\n  blockSize: number,\n  cipher: Cipher\n): void {\n  const _words = words;\n  let keystream: number[];\n\n  // Shortcut\n  const iv = this._iv;\n\n  // Generate keystream\n  if (iv) {\n    keystream = iv.slice(0);\n\n    // Remove IV for subsequent blocks\n    this._iv = undefined;\n  } else {\n    keystream = this._prevBlock!;\n  }\n  cipher.encryptBlock!(keystream, 0);\n\n  // Encrypt\n  for (let i = 0; i < blockSize; i += 1) {\n    _words[offset + i] ^= keystream[i];\n  }\n}\n\n/**\n * CFB Encryptor\n */\nclass CFBEncryptor extends BlockCipherMode {\n  processBlock(words: number[], offset: number): void {\n    // Shortcuts\n    const cipher = this._cipher;\n    const blockSize = cipher.blockSize!;\n\n    generateKeystreamAndEncrypt.call(this, words, offset, blockSize, cipher);\n\n    // Remember this block to use with next block\n    this._prevBlock = words.slice(offset, offset + blockSize);\n  }\n}\n\n/**\n * CFB Decryptor\n */\nclass CFBDecryptor extends BlockCipherMode {\n  processBlock(words: number[], offset: number): void {\n    // Shortcuts\n    const cipher = this._cipher;\n    const blockSize = cipher.blockSize!;\n\n    // Remember this block to use with next block\n    const thisBlock = words.slice(offset, offset + blockSize);\n\n    generateKeystreamAndEncrypt.call(this, words, offset, blockSize, cipher);\n\n    // This block becomes the previous block\n    this._prevBlock = thisBlock;\n  }\n}\n\n/**\n * Cipher Feedback block mode.\n */\nexport class CFB extends BlockCipherMode {\n  static readonly Encryptor = CFBEncryptor;\n  static readonly Decryptor = CFBDecryptor;\n}"],"mappings":";;;AAKA,SAAS,4BAEP,OACA,QACA,WACA,QACM;CACN,MAAM,SAAS;CACf,IAAIA;CAGJ,MAAM,KAAK,KAAK;AAGhB,KAAI,IAAI;AACN,cAAY,GAAG,MAAM;AAGrB,OAAK,MAAM;CACZ,MACC,aAAY,KAAK;AAEnB,QAAO,aAAc,WAAW;AAGhC,MAAK,IAAI,IAAI,GAAG,IAAI,WAAW,KAAK,EAClC,QAAO,SAAS,MAAM,UAAU;AAEnC;;;;AAKD,IAAM,eAAN,cAA2BC,oCAAgB;CACzC,aAAa,OAAiB,QAAsB;EAElD,MAAM,SAAS,KAAK;EACpB,MAAM,YAAY,OAAO;AAEzB,8BAA4B,KAAK,MAAM,OAAO,QAAQ,WAAW;AAGjE,OAAK,aAAa,MAAM,MAAM,QAAQ,SAAS;CAChD;AACF;;;;AAKD,IAAM,eAAN,cAA2BA,oCAAgB;CACzC,aAAa,OAAiB,QAAsB;EAElD,MAAM,SAAS,KAAK;EACpB,MAAM,YAAY,OAAO;EAGzB,MAAM,YAAY,MAAM,MAAM,QAAQ,SAAS;AAE/C,8BAA4B,KAAK,MAAM,OAAO,QAAQ,WAAW;AAGjE,OAAK,aAAa;CACnB;AACF;;;;AAKD,IAAa,MAAb,cAAyBA,oCAAgB;CACvC,OAAgB,YAAY;CAC5B,OAAgB,YAAY;AAC7B"}