crypto-es/dist/mode-cfb.cjs

A cryptography algorithms library compatible with ES6 and TypeScript

const require_cipher_core = require('./cipher-core.cjs');

//#region src/mode-cfb.ts
function generateKeystreamAndEncrypt(words, offset, blockSize, cipher) {
	const _words = words;
	let keystream;
	const iv = this._iv;
	if (iv) {
		keystream = iv.slice(0);
		this._iv = void 0;
	} else keystream = this._prevBlock;
	cipher.encryptBlock(keystream, 0);
	for (let i = 0; i < blockSize; i += 1) _words[offset + i] ^= keystream[i];
}
/**
* CFB Encryptor
*/
var CFBEncryptor = class extends require_cipher_core.BlockCipherMode {
	processBlock(words, offset) {
		const cipher = this._cipher;
		const blockSize = cipher.blockSize;
		generateKeystreamAndEncrypt.call(this, words, offset, blockSize, cipher);
		this._prevBlock = words.slice(offset, offset + blockSize);
	}
};
/**
* CFB Decryptor
*/
var CFBDecryptor = class extends require_cipher_core.BlockCipherMode {
	processBlock(words, offset) {
		const cipher = this._cipher;
		const blockSize = cipher.blockSize;
		const thisBlock = words.slice(offset, offset + blockSize);
		generateKeystreamAndEncrypt.call(this, words, offset, blockSize, cipher);
		this._prevBlock = thisBlock;
	}
};
/**
* Cipher Feedback block mode.
*/
var CFB = class extends require_cipher_core.BlockCipherMode {
	static Encryptor = CFBEncryptor;
	static Decryptor = CFBDecryptor;
};

//#endregion
exports.CFB = CFB;
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