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kotlinlang

Hi, how can I convert a Swift `NSData` to Kotlin `ByteArray`?
Background: I’m working on a Kmp library where we need to use OS’s crypto API to encrypt data. So, in  Kmp library we define an Interface
```interface MessagePackHelper {
    fun serialize(payload: String): ByteArray
}```
from iOS, we need to implement this interface and set back to the Kmp library. So in Swift, we need to implement below method:
```    func serialize(payload: String) -&gt; KotlinByteArray {
        // let encyrpted = encrypt(payload) // result is NSData obect
        // todo - would like to convert NSData -&gt; KotlinByteArray
    }```


```fun NSData.toByteArray(): ByteArray {
    return ByteArray(length.toInt()).apply {
        usePinned {
            memcpy(it.addressOf(0), bytes, length)
        }
    }
}

fun ByteArray.toNSData(): NSData = memScoped { 
    NSData.create(bytes = allocArrayOf(this@toNSData), length = this@toNSData.size.toULong()) 
}```

Thanks <@U04BL3MN6CW>. That should be Kotlin code defined in iOS source set, isn’t it?

Yes, you are right, you need to  `import platform.Foundation.*`