Fixed some of the errors spotted in various aes implementation while doing cryptopals challenge, anyways they were unused. Added multipart generic hash (blake2b) native implementation

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

@@ -5,6 +5,22 @@ package com.ionspin.kotlin.crypto.generichash
  * ugljesa.jovanovic@ionspin.com
  * on 21-Aug-2020
  */
+
+data class GenericHashState(val hashLength: Int, val state: GenericHashStateInternal)
+
+expect class GenericHashStateInternal
+
 expect object GenericHashing {
+
+
+
+
     fun genericHash(message : UByteArray, requestedHashLength: Int, key : UByteArray? = null) : UByteArray
+
+    fun genericHashInit(requestedHashLength: Int, key : UByteArray? = null) : GenericHashState
+    fun genericHashUpdate(state: GenericHashState, messagePart : UByteArray)
+    fun genericHashFinal(state : GenericHashState) : UByteArray
+
 }
+
+

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

@@ -3,17 +3,30 @@ package com.ionspin.kotlin.crypto.generichash
 import kotlinx.cinterop.addressOf
 import kotlinx.cinterop.convert
 import kotlinx.cinterop.pin
+import kotlinx.cinterop.pointed
+import kotlinx.cinterop.ptr
+import kotlinx.cinterop.reinterpret
 import libsodium.crypto_generichash
+import libsodium.crypto_generichash_final
+import libsodium.crypto_generichash_init
+import libsodium.crypto_generichash_state
+import libsodium.crypto_generichash_update
+import platform.posix.malloc
 
 /**
  * Created by Ugljesa Jovanovic
  * ugljesa.jovanovic@ionspin.com
  * on 21-Aug-2020
  */
+
+actual typealias GenericHashStateInternal = libsodium.crypto_generichash_blake2b_state
+
 actual object GenericHashing {
     val _emitByte: Byte = 0
     val _emitByteArray: ByteArray = ByteArray(0)
 
+
+
     actual fun genericHash(message: UByteArray, requestedHashLength: Int, key: UByteArray?) : UByteArray {
         val hash = UByteArray(requestedHashLength)
         val pinnedHash = hash.pin()
@@ -32,4 +45,48 @@ actual object GenericHashing {
         pinnedMessage.unpin()
         return hash
     }
+
+    actual fun genericHashInit(
+        requestedHashLength: Int,
+        key: UByteArray?
+    ): GenericHashState {
+        val stateAllocated = malloc(GenericHashStateInternal.size.convert())
+        val statePointed = stateAllocated!!.reinterpret<GenericHashStateInternal>().pointed
+        val pinnedKey = key?.pin()
+        crypto_generichash_init(
+            statePointed.ptr,
+            pinnedKey?.addressOf(0),
+            (key?.size ?: 0).convert(),
+            requestedHashLength.convert()
+        )
+        pinnedKey?.unpin()
+        return GenericHashState(requestedHashLength, statePointed)
+    }
+
+    actual fun genericHashUpdate(
+        state: GenericHashState,
+        messagePart: UByteArray
+    ) {
+        val pinnedMessage = messagePart.pin()
+        crypto_generichash_update(
+            state.state.ptr,
+            pinnedMessage.addressOf(0),
+            messagePart.size.convert()
+        )
+        pinnedMessage.unpin()
+    }
+
+    actual fun genericHashFinal(state: GenericHashState): UByteArray {
+        val hashResult = UByteArray(state.hashLength)
+        val hashResultPinned = hashResult.pin()
+        crypto_generichash_final(
+            state.state.ptr,
+            hashResultPinned.addressOf(0),
+            state.hashLength.convert()
+        )
+        hashResultPinned.unpin()
+        return hashResult
+    }
+
+
 }