Short hash implementation and test, updated cbc tests as they ignored padding

multiplatform-crypto-libsodium-bindings/src/commonMain/kotlin/com.ionspin.kotlin.crypto/shortinputhash/ShortHash.kt

@@ -0,0 +1,15 @@
+package com.ionspin.kotlin.crypto.shortinputhash
+
+/**
+ * Created by Ugljesa Jovanovic
+ * ugljesa.jovanovic@ionspin.com
+ * on 21-Aug-2020
+ */
+const val crypto_shorthash_KEYBYTES = 16
+const val crypto_shorthash_BYTES = 8
+
+expect object ShortHash {
+
+    fun shortHash(data : UByteArray, key: UByteArray) : UByteArray
+    fun shortHashKeygen() : UByteArray
+}

multiplatform-crypto-libsodium-bindings/src/commonMain/kotlin/com.ionspin.kotlin.crypto/shortinputhash/ShortInputHashing.kt

@@ -1,10 +0,0 @@
-package com.ionspin.kotlin.crypto.shortinputhash
-
-/**
- * Created by Ugljesa Jovanovic
- * ugljesa.jovanovic@ionspin.com
- * on 21-Aug-2020
- */
-object ShortInputHashing {
-
-}

multiplatform-crypto-libsodium-bindings/src/commonMain/kotlin/com.ionspin.kotlin.crypto/util/Util.kt

@@ -0,0 +1,24 @@
+package com.ionspin.kotlin.crypto.util
+
+/**
+ * Created by Ugljesa Jovanovic
+ * ugljesa.jovanovic@ionspin.com
+ * on 28-Aug-2020
+ */
+fun String.hexStringToUByteArray() : UByteArray {
+    return this.chunked(2).map { it.toUByte(16) }.toUByteArray()
+}
+
+fun String.encodeToUByteArray() : UByteArray{
+    return encodeToByteArray().asUByteArray()
+}
+
+fun UByteArray.toHexString() : String {
+    return this.joinToString(separator = "") {
+        if (it <= 0x0FU) {
+            "0${it.toString(16)}"
+        } else {
+            it.toString(16)
+        }
+    }
+}