Adding secret stream impl, completed generichash impl

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

@@ -0,0 +1,53 @@
+package com.ionspin.kotlin.crypto.generichash
+
+import com.ionspin.kotlin.crypto.LibsodiumInitializer.sodium
+
+/**
+ * Created by Ugljesa Jovanovic
+ * ugljesa.jovanovic@ionspin.com
+ * on 21-Aug-2020
+ */
+actual class GenericHashStateInternal(internal val data: ByteArray)
+
+actual object GenericHash {
+    actual fun genericHash(
+        message: UByteArray,
+        requestedHashLength: Int,
+        key: UByteArray?
+    ): UByteArray {
+        val hash = UByteArray(requestedHashLength)
+        sodium.crypto_generichash(
+            hash.asByteArray(),
+            requestedHashLength,
+            message.asByteArray(),
+            message.size.toLong(),
+            key?.asByteArray(),
+            (key?.size ?: 0)
+        )
+        return hash
+    }
+
+    actual fun genericHashInit(
+        requestedHashLength: Int,
+        key: UByteArray?
+    ): GenericHashState {
+        val state = GenericHashStateInternal(ByteArray(sodium.crypto_generichash_statebytes()))
+        sodium.crypto_generichash_init(state.data, key?.asByteArray(), key?.size ?: 0, requestedHashLength)
+        return GenericHashState(requestedHashLength, state)
+    }
+
+    actual fun genericHashUpdate(
+        state: GenericHashState,
+        messagePart: UByteArray
+    ) {
+        sodium.crypto_generichash_update(state.internalState.data, messagePart.asByteArray(), messagePart.size.toLong())
+    }
+
+    actual fun genericHashFinal(state: GenericHashState): UByteArray {
+        val hashResult = ByteArray(state.hashLength)
+        sodium.crypto_generichash_final(state.internalState.data, hashResult, state.hashLength)
+        return hashResult.asUByteArray()
+    }
+
+
+}

multiplatform-crypto-libsodium-bindings/src/jvmMain/kotlin/com/ionspin/kotlin/crypto/generichash/GenericHashing.kt

@@ -1,27 +0,0 @@
-package com.ionspin.kotlin.crypto.generichash
-
-import com.ionspin.kotlin.crypto.LibsodiumInitializer.sodium
-
-/**
- * Created by Ugljesa Jovanovic
- * ugljesa.jovanovic@ionspin.com
- * on 21-Aug-2020
- */
-actual object GenericHashing {
-    actual fun genericHash(
-        message: UByteArray,
-        requestedHashLength: Int,
-        key: UByteArray?
-    ): UByteArray {
-        val hash = UByteArray(requestedHashLength)
-        sodium.crypto_generichash(
-            hash.asByteArray(),
-            requestedHashLength,
-            message.asByteArray(),
-            message.size.toLong(),
-            key?.asByteArray(),
-            (key?.size ?: 0)
-        )
-        return hash
-    }
-}