async hashing of channels and flows (big data)

src/commonTest/kotlin/HashTest.kt

@@ -0,0 +1,38 @@
+import kotlinx.coroutines.flow.asFlow
+import kotlinx.coroutines.test.runTest
+import kotlinx.datetime.Clock
+import net.sergeych.crypto2.Hash
+import net.sergeych.crypto2.initCrypto
+import kotlin.random.Random
+import kotlin.random.nextUBytes
+import kotlin.test.*
+
+@Suppress("UNUSED_PARAMETER", "UNUSED_VARIABLE")
+suspend fun <T> sw(label: String, f: suspend () -> T): T {
+    val t1 = Clock.System.now()
+    val result = f()
+    val t2 = Clock.System.now()
+//    println("$label: ${t2 - t1}")
+    return result
+}
+
+class HashTest {
+    @Test
+    fun testEqualMethods() {
+        fun testMethod(h: Hash) = runTest {
+            initCrypto()
+            val a = Random.Default.nextUBytes(1024)
+            val b = Random.Default.nextUBytes(1024)
+            val c = a + b
+            val h1 = sw("dir $h") { h.digest(c) }
+            val h2 = sw("ind $h") { h.ofFlow(listOf(a, b).asFlow()) }
+
+            assertContentEquals(h1, h2)
+        }
+        for (i in 0..10) {
+            testMethod(Hash.Blake2b)
+            testMethod(Hash.Sha3_256)
+            testMethod(Hash.Sha3_384)
+        }
+    }
+}