init

2025-05-19 20:36:21 -05:00
commit f5303487be
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+"use strict";
+// Cipher Feedback
+var __classPrivateFieldSet = (this && this.__classPrivateFieldSet) || function (receiver, state, value, kind, f) {
+    if (kind === "m") throw new TypeError("Private method is not writable");
+    if (kind === "a" && !f) throw new TypeError("Private accessor was defined without a setter");
+    if (typeof state === "function" ? receiver !== state || !f : !state.has(receiver)) throw new TypeError("Cannot write private member to an object whose class did not declare it");
+    return (kind === "a" ? f.call(receiver, value) : f ? f.value = value : state.set(receiver, value)), value;
+};
+var __classPrivateFieldGet = (this && this.__classPrivateFieldGet) || function (receiver, state, kind, f) {
+    if (kind === "a" && !f) throw new TypeError("Private accessor was defined without a getter");
+    if (typeof state === "function" ? receiver !== state || !f : !state.has(receiver)) throw new TypeError("Cannot read private member from an object whose class did not declare it");
+    return kind === "m" ? f : kind === "a" ? f.call(receiver) : f ? f.value : state.get(receiver);
+};
+var _CFB_instances, _CFB_iv, _CFB_shiftRegister, _CFB_shift;
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.CFB = void 0;
+const mode_js_1 = require("./mode.js");
+class CFB extends mode_js_1.ModeOfOperation {
+    constructor(key, iv, segmentSize = 8) {
+        super("CFB", key, CFB);
+        _CFB_instances.add(this);
+        _CFB_iv.set(this, void 0);
+        _CFB_shiftRegister.set(this, void 0);
+        // This library currently only handles byte-aligned segmentSize
+        if (!Number.isInteger(segmentSize) || (segmentSize % 8)) {
+            throw new TypeError("invalid segmentSize");
+        }
+        Object.defineProperties(this, {
+            segmentSize: { enumerable: true, value: segmentSize }
+        });
+        if (iv) {
+            if (iv.length % 16) {
+                throw new TypeError("invalid iv size (must be 16 bytes)");
+            }
+            __classPrivateFieldSet(this, _CFB_iv, new Uint8Array(iv), "f");
+        }
+        else {
+            __classPrivateFieldSet(this, _CFB_iv, new Uint8Array(16), "f");
+        }
+        __classPrivateFieldSet(this, _CFB_shiftRegister, this.iv, "f");
+    }
+    get iv() { return new Uint8Array(__classPrivateFieldGet(this, _CFB_iv, "f")); }
+    encrypt(plaintext) {
+        if (8 * plaintext.length % this.segmentSize) {
+            throw new TypeError("invalid plaintext size (must be multiple of segmentSize bytes)");
+        }
+        const segmentSize = this.segmentSize / 8;
+        const ciphertext = new Uint8Array(plaintext);
+        for (let i = 0; i < ciphertext.length; i += segmentSize) {
+            const xorSegment = this.aes.encrypt(__classPrivateFieldGet(this, _CFB_shiftRegister, "f"));
+            for (let j = 0; j < segmentSize; j++) {
+                ciphertext[i + j] ^= xorSegment[j];
+            }
+            __classPrivateFieldGet(this, _CFB_instances, "m", _CFB_shift).call(this, ciphertext.subarray(i));
+        }
+        return ciphertext;
+    }
+    decrypt(ciphertext) {
+        if (8 * ciphertext.length % this.segmentSize) {
+            throw new TypeError("invalid ciphertext size (must be multiple of segmentSize bytes)");
+        }
+        const segmentSize = this.segmentSize / 8;
+        const plaintext = new Uint8Array(ciphertext);
+        for (let i = 0; i < plaintext.length; i += segmentSize) {
+            const xorSegment = this.aes.encrypt(__classPrivateFieldGet(this, _CFB_shiftRegister, "f"));
+            for (let j = 0; j < segmentSize; j++) {
+                plaintext[i + j] ^= xorSegment[j];
+            }
+            __classPrivateFieldGet(this, _CFB_instances, "m", _CFB_shift).call(this, ciphertext.subarray(i));
+        }
+        return plaintext;
+    }
+}
+exports.CFB = CFB;
+_CFB_iv = new WeakMap(), _CFB_shiftRegister = new WeakMap(), _CFB_instances = new WeakSet(), _CFB_shift = function _CFB_shift(data) {
+    const segmentSize = this.segmentSize / 8;
+    // Shift the register
+    __classPrivateFieldGet(this, _CFB_shiftRegister, "f").set(__classPrivateFieldGet(this, _CFB_shiftRegister, "f").subarray(segmentSize));
+    __classPrivateFieldGet(this, _CFB_shiftRegister, "f").set(data.subarray(0, segmentSize), 16 - segmentSize);
+};
+//# sourceMappingURL=mode-cfb.js.map