1 files changed, 78 insertions, 0 deletions
diff --git a/g4f/Provider/npm/node_modules/funcaptcha/src/crypt.ts b/g4f/Provider/npm/node_modules/funcaptcha/src/crypt.ts
new file mode 100644
index 00000000..fb883660
--- /dev/null
+++ b/g4f/Provider/npm/node_modules/funcaptcha/src/crypt.ts
@@ -0,0 +1,78 @@
+import { createHash, createCipheriv, createDecipheriv } from "crypto";
+
+interface EncryptionData {
+    ct: string;
+    iv: string;
+    s: string;
+}
+
+function encrypt(data: string, key: string): string {
+    let salt = "";
+    let salted = "";
+    let dx = Buffer.alloc(0);
+
+    // Generate salt, as 8 random lowercase letters
+    salt = String.fromCharCode(...Array(8).fill(0).map(_ => Math.floor(Math.random() * 26) + 97))
+
+    // Our final key and iv come from the key and salt being repeatedly hashed
+    // dx = md5(md5(md5(key + salt) + key + salt) + key + salt)
+    // For each round of hashing, we append the result to salted, resulting in a 96 character string
+    // The first 64 characters are the key, and the last 32 are the iv
+    for (let x = 0; x < 3; x++) {
+        dx = createHash("md5")
+            .update(
+                Buffer.concat([
+                    Buffer.from(dx),
+                    Buffer.from(key),
+                    Buffer.from(salt),
+                ])
+            )
+            .digest();
+
+        salted += dx.toString("hex");
+    }
+
+    let aes = createCipheriv(
+        "aes-256-cbc",
+        Buffer.from(salted.substring(0, 64), "hex"), // Key
+        Buffer.from(salted.substring(64, 64 + 32), "hex") // IV
+    );
+
+    return JSON.stringify({
+        ct: aes.update(data, null, "base64") + aes.final("base64"),
+        iv: salted.substring(64, 64 + 32),
+        s: Buffer.from(salt).toString("hex"),
+    });
+}
+
+function decrypt(rawData: string, key: string): string {
+    let data: EncryptionData = JSON.parse(rawData);
+
+    // We get our decryption key by doing the inverse of the encryption process
+    let dk = Buffer.concat([Buffer.from(key), Buffer.from(data.s, "hex")]);
+    let arr = [Buffer.from(createHash("md5").update(dk).digest()).toString("hex")];
+    let result = arr[0];
+
+    for (let x = 1; x < 3; x++) {
+        arr.push(
+            Buffer.from(
+                createHash("md5")
+                    .update(Buffer.concat([Buffer.from(arr[x - 1], "hex"), dk]))
+                    .digest()
+            ).toString("hex")
+        );
+        result += arr[x];
+    }
+
+    let aes = createDecipheriv(
+        "aes-256-cbc",
+        Buffer.from(result.substring(0, 64), "hex"),
+        Buffer.from(data.iv, "hex")
+    );
+    return aes.update(data.ct, "base64", "utf8") + aes.final("utf8");
+}
+
+export default {
+    encrypt,
+    decrypt,
+};