Implemented mingw srng, add some more gradle handling for idea, disabled mingwx86 for now as it's not supported by coroutines, and I want to use coroutines eventually

multiplatform-crypto/src/commonTest/kotlin/com/ionspin/kotlin/crypto/SRNGTest.kt

@@ -27,9 +27,11 @@ import kotlin.test.assertTrue
 class SRNGTest {
     @Test
     fun testSrng() {
+        //Just a sanity test, need to add better srng tests.
         val randomBytes1 = SRNG.getRandomBytes(10)
         val randomBytes2 = SRNG.getRandomBytes(10)
-//        assertTrue { !randomBytes1.contentEquals(randomBytes2) }
-        //TODO implement SRNG for minGW
+        randomBytes1.forEach { println("RB1: $it")}
+        randomBytes2.forEach { println("RB2: $it")}
+        assertTrue { !randomBytes1.contentEquals(randomBytes2) }
     }
 }

multiplatform-crypto/src/mingwX64Main/kotlin/com/ionspin/kotlin/crypto/SRNG.kt

@@ -0,0 +1,43 @@
+/*
+ *    Copyright 2019 Ugljesa Jovanovic
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+
+package com.ionspin.kotlin.crypto
+
+import kotlinx.cinterop.*
+import platform.windows.*
+
+/**
+ * Created by Ugljesa Jovanovic
+ * ugljesa.jovanovic@ionspin.com
+ * on 21-Sep-2019
+ */
+actual object SRNG {
+    private val advapi by lazy { LoadLibraryA("ADVAPI32.DLL")}
+
+    private val advapiRandom by lazy {
+        GetProcAddress(advapi, "SystemFunction036")?.reinterpret<CFunction<Function2<CPointer<ByteVar>, ULong, Int>>>() ?: error("Failed getting advapi random")
+    }
+
+    @Suppress("EXPERIMENTAL_UNSIGNED_LITERALS")
+    actual fun getRandomBytes(amount: Int): Array<UByte> {
+        memScoped {
+            val randArray = allocArray<ByteVar>(amount)
+            val pointer = randArray.getPointer(this)
+            val status = advapiRandom(pointer.reinterpret(), amount.convert())
+            return Array<UByte>(amount) { pointer[it].toUByte() }
+        }
+    }
+}

multiplatform-crypto/src/mingwX64Test/kotlin/com/ionspin/kotlin/bignum/crypto/util/testBlocking.kt

@@ -0,0 +1,27 @@
+/*
+ *    Copyright 2019 Ugljesa Jovanovic
+ *
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ *
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+
+package com.ionspin.kotlin.crypto.util
+
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.runBlocking
+
+/**
+ * Created by Ugljesa Jovanovic
+ * ugljesa.jovanovic@ionspin.com
+ * on 20-Jul-2019
+ */
+actual fun testBlocking(block: suspend (scope: CoroutineScope) -> Unit) = runBlocking { block(this) }