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