【Kotlin】"AES/CBC/PKCS7Padding"での暗号化・復号化

暗号化

fun String.encrypt(): String {
    //それぞれ16文字にする
    val secretKey = "abcdefghijklmnop"
    val initializationKey = "ABCDEFGHIJKLMNOP"
    val key = SecretKeySpec(secretKey.toByteArray(), "AES")
    val iv = IvParameterSpec(initializationKey.toByteArray())

    val cipher = Cipher.getInstance("AES/CBC/PKCS7Padding")
    cipher.init(Cipher.ENCRYPT_MODE, key, iv)

    val byteResult = cipher.doFinal(this.toByteArray())

    return Base64.encodeToString(byteResult, Base64.NO_WRAP)
}

復号化

fun String.decrypt(): String {
    //それぞれ16文字にする
    val secretKey = "abcdefghijklmnop"
    val initializationKey = "ABCDEFGHIJKLMNOP"
    val key = SecretKeySpec(secretKey.toByteArray(), "AES")
    val iv = IvParameterSpec(initializationKey.toByteArray())

    val cipher = Cipher.getInstance("AES/CBC/PKCS7Padding")
    cipher.init(Cipher.DECRYPT_MODE, key, iv)

    val byteResult = cipher.doFinal(Base64.decode(this, Base64.NO_WRAP))

    return String(byteResult)
}