Added scalarult tests, used case from libsodium scalamult.c test

multiplatform-crypto-libsodium-bindings/src/commonMain/kotlin/com.ionspin.kotlin.crypto/scalarmult/ScalarMultiplication.kt

@@ -1,4 +1,4 @@
-package com.ionspin.kotlin.crypto.scalarmut
+package com.ionspin.kotlin.crypto.scalarmult
 
 /**
  * Created by Ugljesa Jovanovic

multiplatform-crypto-libsodium-bindings/src/commonTest/kotlin/com/ionspin/kotlin/crypto/scalarmult/ScalarMultiplicationTest.kt

@@ -0,0 +1,50 @@
+package com.ionspin.kotlin.crypto.scalarmult
+
+import com.ionspin.kotlin.crypto.util.toHexString
+import kotlin.test.Test
+import kotlin.test.assertTrue
+
+/**
+ * Created by Ugljesa Jovanovic
+ * ugljesa.jovanovic@ionspin.com
+ * on 15-Oct-2020
+ */
+class ScalarMultiplicationTest {
+    val aliceSecretKey = ubyteArrayOf(
+        0x77U, 0x07U, 0x6dU, 0x0aU, 0x73U, 0x18U, 0xa5U, 0x7dU, 0x3cU, 0x16U, 0xc1U,
+        0x72U, 0x51U, 0xb2U, 0x66U, 0x45U, 0xdfU, 0x4cU, 0x2fU, 0x87U, 0xebU, 0xc0U,
+        0x99U, 0x2aU, 0xb1U, 0x77U, 0xfbU, 0xa5U, 0x1dU, 0xb9U, 0x2cU, 0x2aU
+    )
+
+    val bobSecretKey = ubyteArrayOf(
+        0x5dU, 0xabU, 0x08U, 0x7eU, 0x62U, 0x4aU, 0x8aU, 0x4bU, 0x79U, 0xe1U, 0x7fU,
+        0x8bU, 0x83U, 0x80U, 0x0eU, 0xe6U, 0x6fU, 0x3bU, 0xb1U, 0x29U, 0x26U, 0x18U,
+        0xb6U, 0xfdU, 0x1cU, 0x2fU, 0x8bU, 0x27U, 0xffU, 0x88U, 0xe0U, 0xebU
+    )
+
+
+    val expectedAlicePublicKeyString = "8520f0098930a754748b7ddcb43ef75a0dbf3a0d26381af4eba4a98eaa9b4e6a"
+    val expectedBobPublickKeyString = "de9edb7d7b7dc1b4d35b61c2ece435373f8343c85b78674dadfc7e146f882b4f"
+    val expectedSharedSecretString = "4a5d9d5ba4ce2de1728e3bf480350f25e07e21c947d19e3376f09b3c1e161742"
+
+    @Test
+    fun testScalarMultiplication() {
+        val alicePublicKey = ScalarMultiplication.scalarMultiplicationBase(aliceSecretKey)
+        assertTrue {
+            alicePublicKey.toHexString().equals(expectedAlicePublicKeyString)
+        }
+        val bobPublickKey = ScalarMultiplication.scalarMultiplicationBase(bobSecretKey)
+        assertTrue {
+            bobPublickKey.toHexString().equals(expectedBobPublickKeyString)
+        }
+        val aliceToBobSecret = ScalarMultiplication.scalarMultiplication(aliceSecretKey, bobPublickKey)
+        val bobToAliceSecret = ScalarMultiplication.scalarMultiplication(bobSecretKey, alicePublicKey)
+        assertTrue {
+            aliceToBobSecret.toHexString().equals(expectedSharedSecretString)
+        }
+        assertTrue {
+            bobToAliceSecret.toHexString().equals(expectedSharedSecretString)
+        }
+        println(aliceToBobSecret.toHexString())
+    }
+}

multiplatform-crypto-libsodium-bindings/src/nativeMain/kotlin/com/ionspin/kotlin/crypto/scalarmult/ScalarMultiplication.kt

@@ -1,4 +1,4 @@
-package com.ionspin.kotlin.crypto.scalarmut
+package com.ionspin.kotlin.crypto.scalarmult
 
 import com.ionspin.kotlin.crypto.util.toPtr
 import kotlinx.cinterop.pin