Adding secret stream impl, completed generichash impl

multiplatform-crypto-libsodium-bindings/src/commonMain/kotlin/com.ionspin.kotlin.crypto/generichash/GenericHash.kt

@@ -6,14 +6,11 @@ package com.ionspin.kotlin.crypto.generichash
  * on 21-Aug-2020
  */
 
-data class GenericHashState(val hashLength: Int, val state: GenericHashStateInternal)
+data class GenericHashState(val hashLength: Int, val internalState: GenericHashStateInternal)
 
 expect class GenericHashStateInternal
 
-expect object GenericHashing {
-
-
-
+expect object GenericHash {
 
     fun genericHash(message : UByteArray, requestedHashLength: Int, key : UByteArray? = null) : UByteArray
 

multiplatform-crypto-libsodium-bindings/src/commonMain/kotlin/com.ionspin.kotlin.crypto/secretstream/SecretStream.kt

@@ -0,0 +1,21 @@
+package com.ionspin.kotlin.crypto.secretstream
+
+/**
+ * Created by Ugljesa Jovanovic
+ * ugljesa.jovanovic@ionspin.com
+ * on 26-Aug-2020
+ */
+expect class SecretStreamState
+
+data class SecretStreamStateAndHeader(val state: SecretStreamState, val header : UByteArray)
+
+data class DecryptedDataAndTag(val decryptedData : UByteArray, val tag : UByte)
+
+expect object SecretStream {
+
+    fun xChaCha20Poly1305InitPush(key: UByteArray) : SecretStreamStateAndHeader
+    fun xChaCha20Poly1305Push(state : SecretStreamState, message: UByteArray, additionalData : UByteArray = ubyteArrayOf(), tag: UByte) : UByteArray
+    fun xChaCha20Poly1305InitPull(key: UByteArray, header: UByteArray) : SecretStreamStateAndHeader
+    fun xChaCha20Poly1305Pull(state : SecretStreamState, ciphertext: UByteArray, additionalData : UByteArray = ubyteArrayOf()) : DecryptedDataAndTag
+
+}