RVYJb30L

1object CryptoUtil {
2    @JvmStatic
3    fun aesEncrypt(value: String, secretKey: String) = AES256.encrypt(value, secretKey)
4
5    @JvmStatic
6    fun aesDecrypt(value: String, secretKey: String) = AES256.decrypt(value, secretKey)
7}
8
9private object AES256 {
10    private fun cipher(opmode: Int, secretKey: String): Cipher {
11        if (secretKey.length != 32) throw RuntimeException("SecretKey length is not 32 chars")
12        val c = Cipher.getInstance("AES/CBC/PKCS5Padding")
13        val sk = SecretKeySpec(secretKey.toByteArray(Charsets.UTF_8), "AES")
14        val iv = IvParameterSpec(secretKey.substring(0, 16).toByteArray(Charsets.UTF_8))
15        c.init(opmode, sk, iv)
16        return c
17    }
18
19    fun encrypt(str: String, secretKey: String): String {
20        val encrypted =
21            cipher(Cipher.ENCRYPT_MODE, secretKey).doFinal(str.toByteArray(Charsets.UTF_8))
22        return String(Base64.encode(encrypted, Base64.DEFAULT))
23    }
24
25    fun decrypt(str: String, secretKey: String): String {
26        val byteStr = Base64.decode(str.toByteArray(Charsets.UTF_8), Base64.DEFAULT)
27        return String(cipher(Cipher.DECRYPT_MODE, secretKey).doFinal(byteStr))
28    }
29}
30