encryption - 加密/解密字符串 Kotlin

Question

我在 Kotlin 中创建了这两个扩展来加密/解密字符串:

fun String.encrypt(seed : String): String {
    val keyGenerator = KeyGenerator.getInstance("AES")
    val secureRandom = SecureRandom.getInstance("SHA1PRNG")
    secureRandom.setSeed(seed.toByteArray())

    keyGenerator.init(128, secureRandom)
    val skey = keyGenerator.generateKey()
    val rawKey : ByteArray = skey.encoded

    val skeySpec = SecretKeySpec(rawKey, "AES")
    val cipher = Cipher.getInstance("AES/CBC/PKCS5Padding")
    cipher.init(Cipher.ENCRYPT_MODE, skeySpec)
    val byteArray = cipher.doFinal(this.toByteArray())

    return byteArray.toString()
}

fun String.decrypt(seed : String): String {
    val keyGenerator = KeyGenerator.getInstance("AES")
    val secureRandom = SecureRandom.getInstance("SHA1PRNG")
    secureRandom.setSeed(seed.toByteArray())

    keyGenerator.init(128, secureRandom)
    val skey = keyGenerator.generateKey()
    val rawKey : ByteArray = skey.encoded

    val skeySpec = SecretKeySpec(rawKey, "AES")
    val cipher = Cipher.getInstance("AES/CBC/PKCS5Padding")
    cipher.init(Cipher.DECRYPT_MODE, skeySpec)
    val byteArray = cipher.doFinal(this.toByteArray())

    return byteArray.toString()
}

出于某种原因，我收到以下异常:

javax.crypto.IllegalBlockSizeException: last block incomplete in decryption

我做错了什么？

Answer 1

AES 加密/解密使用 base64 key 、salt 和 iv(初始化向量)。

object AESEncyption {

const val secretKey = "tK5UTui+DPh8lIlBxya5XVsmeDCoUl6vHhdIESMB6sQ="
const val salt = "QWlGNHNhMTJTQWZ2bGhpV3U=" // base64 decode => AiF4sa12SAfvlhiWu
const val iv = "bVQzNFNhRkQ1Njc4UUFaWA==" // base64 decode => mT34SaFD5678QAZX

fun encrypt(strToEncrypt: String) :  String?
{
    try
    {
        val ivParameterSpec = IvParameterSpec(Base64.decode(iv, Base64.DEFAULT))

        val factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1")
        val spec =  PBEKeySpec(secretKey.toCharArray(), Base64.decode(salt, Base64.DEFAULT), 10000, 256)
        val tmp = factory.generateSecret(spec)
        val secretKey =  SecretKeySpec(tmp.encoded, "AES")

        val cipher = Cipher.getInstance("AES/CBC/PKCS7Padding")
        cipher.init(Cipher.ENCRYPT_MODE, secretKey, ivParameterSpec)
        return Base64.encodeToString(cipher.doFinal(strToEncrypt.toByteArray(Charsets.UTF_8)), Base64.DEFAULT)
    }
    catch (e: Exception)
    {
        println("Error while encrypting: $e")
    }
    return null
}

fun decrypt(strToDecrypt : String) : String? {
    try
    {

        val ivParameterSpec =  IvParameterSpec(Base64.decode(iv, Base64.DEFAULT))

        val factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1")
        val spec =  PBEKeySpec(secretKey.toCharArray(), Base64.decode(salt, Base64.DEFAULT), 10000, 256)
        val tmp = factory.generateSecret(spec);
        val secretKey =  SecretKeySpec(tmp.encoded, "AES")

        val cipher = Cipher.getInstance("AES/CBC/PKCS7Padding");
        cipher.init(Cipher.DECRYPT_MODE, secretKey, ivParameterSpec);
        return  String(cipher.doFinal(Base64.decode(strToDecrypt, Base64.DEFAULT)))
    }
    catch (e : Exception) {
        println("Error while decrypting: $e");
    }
    return null
  }
}

iOS swift