Added js and jvm implementations of _kx_

multiplatform-crypto-libsodium-bindings/src/jsMain/kotlin/com/ionspin/kotlin/crypto/JsSodiumInterface.kt

@@ -216,6 +216,12 @@ interface JsSodiumInterface {
 
     // ---- Utils end ----
 
+    // ---- Key exchange ----
+    fun crypto_kx_client_session_keys(clientPublicKey: Uint8Array, clientSecretKey: Uint8Array, serverPublicKey: Uint8Array) : dynamic
+    fun crypto_kx_keypair() : dynamic
+    fun crypto_kx_seed_keypair(seed: Uint8Array) : dynamic
+    fun crypto_kx_server_session_keys(serverPublicKey: Uint8Array, serverSecretKey: Uint8Array, clientPublicKey: Uint8Array) : dynamic
+
 
 
 

multiplatform-crypto-libsodium-bindings/src/jsMain/kotlin/com/ionspin/kotlin/crypto/keyexchange/KeyExchange.kt

@@ -0,0 +1,57 @@
+package com.ionspin.kotlin.crypto.keyexchange
+
+import com.ionspin.kotlin.crypto.getSodium
+import ext.libsodium.com.ionspin.kotlin.crypto.toUByteArray
+import ext.libsodium.com.ionspin.kotlin.crypto.toUInt8Array
+import org.khronos.webgl.Uint8Array
+
+actual object KeyExchange {
+    actual fun clientSessionKeys(clientPublicKey: UByteArray, clientSecretKey: UByteArray, serverPublicKey: UByteArray) : KeyExchangeSessionKeyPair {
+
+
+        val result = getSodium().crypto_kx_client_session_keys(
+            clientPublicKey.toUInt8Array(),
+            clientSecretKey.toUInt8Array(),
+            serverPublicKey.toUInt8Array()
+        )
+
+        val receiveKey = (result.sharedRx as Uint8Array).toUByteArray()
+        val sendKey = (result.sharedTx as Uint8Array).toUByteArray()
+
+
+
+        return KeyExchangeSessionKeyPair(receiveKey, sendKey)
+    }
+
+    actual fun keypair() : KeyExchangeKeyPair {
+        val result = getSodium().crypto_kx_keypair()
+
+        val publicKey = (result.publicKey as Uint8Array).toUByteArray()
+        val secretKey = (result.privateKey as Uint8Array).toUByteArray()
+
+        return KeyExchangeKeyPair(publicKey, secretKey)
+    }
+
+    actual fun seedKeypair(seed: UByteArray) : KeyExchangeKeyPair {
+        val result = getSodium().crypto_kx_seed_keypair(seed.toUInt8Array())
+
+        val publicKey = (result.publicKey as Uint8Array).toUByteArray()
+        val secretKey = (result.privateKey as Uint8Array).toUByteArray()
+
+        return KeyExchangeKeyPair(publicKey, secretKey)
+    }
+
+    actual fun serverSessionKeys(serverPublicKey: UByteArray, serverSecretKey: UByteArray, clientPublicKey: UByteArray) : KeyExchangeSessionKeyPair {
+
+        val result = getSodium().crypto_kx_server_session_keys(
+            serverPublicKey.toUInt8Array(),
+            serverSecretKey.toUInt8Array(),
+            clientPublicKey.toUInt8Array()
+        )
+
+        val receiveKey = (result.sharedRx as Uint8Array).toUByteArray()
+        val sendKey = (result.sharedTx as Uint8Array).toUByteArray()
+
+        return KeyExchangeSessionKeyPair(receiveKey, sendKey)
+    }
+}