如何使用kotlin正确解密c++的aes Rijndael CBC？

import org.bouncycastle.crypto.engines.RijndaelEngine
import org.bouncycastle.crypto.modes.CBCBlockCipher
import org.bouncycastle.crypto.paddings.PKCS7Padding
import org.bouncycastle.crypto.params.KeyParameter
import org.bouncycastle.crypto.params.ParametersWithIV

fun decryptAES(data: ByteArray, key: ByteArray, iv: ByteArray): ByteArray {
    val cipher = CBCBlockCipher(RijndaelEngine(256))
    val paddedBufferedBlockCipher = PaddedBufferedBlockCipher(cipher, PKCS7Padding())

    val keyParam = KeyParameter(key)
    val ivParam = ParametersWithIV(keyParam, iv)
    paddedBufferedBlockCipher.init(false, ivParam)

    val output = ByteArray(paddedBufferedBlockCipher.getOutputSize(data.size))
    val outputLength = paddedBufferedBlockCipher.processBytes(data, 0, data.size, output, 0)
    paddedBufferedBlockCipher.doFinal(output, outputLength)

    return output
}

val encryptedData = // 加密的数据
val key = // 密钥
val iv = // IV向量

val decryptedData = decryptAES(encryptedData, key, iv)