diff options
Diffstat (limited to 'g4f/Provider/npm/node_modules/funcaptcha/src/crypt.ts')
-rw-r--r-- | g4f/Provider/npm/node_modules/funcaptcha/src/crypt.ts | 78 |
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, +}; |