Added support for compact encryption/decryption with caller-provided nonce in SymmetricKey and accompanying tests. Bumped version to 0.9.1-SNAPSHOT.

src/commonTest/kotlin/KeysTest.kt

@@ -11,7 +11,6 @@
 import com.ionspin.kotlin.crypto.util.decodeFromUByteArray
 import com.ionspin.kotlin.crypto.util.encodeToUByteArray
 import kotlinx.coroutines.test.runTest
-import kotlinx.serialization.encodeToString
 import kotlinx.serialization.json.Json
 import net.sergeych.bipack.BipackDecoder
 import net.sergeych.bipack.BipackEncoder
@@ -118,6 +117,44 @@ class KeysTest {
         assertContentEquals(src, k1.decrypt(k1.encrypt(src, 7..117)))
     }
 
+    @Test
+    fun symmetricKeyCompactTest() = runTest {
+        initCrypto()
+        val key = SymmetricKey.new()
+        val otherKey = SymmetricKey.new()
+        val src = "readme.md".encodeToUByteArray()
+        val nonce = key.randomNonce()
+        val cipher = key.encryptCompactWithNonce(src, nonce)
+
+        assertEquals(src.size + 16, cipher.size)
+        assertTrue(cipher.size < key.encryptWithNonce(src, nonce).size)
+        assertTrue(cipher.size < key.encrypt(src).size)
+        assertContentEquals(src, key.decryptCompactWithNonce(cipher, nonce))
+
+        assertThrows<DecryptionFailedException> {
+            otherKey.decryptCompactWithNonce(cipher, nonce)
+        }
+
+        assertThrows<DecryptionFailedException> {
+            val n2 = nonce.copyOf()
+            n2[4] = n2[4].inv()
+            key.decryptCompactWithNonce(cipher, n2)
+        }
+
+        assertThrows<DecryptionFailedException> {
+            val c2 = cipher.copyOf()
+            c2[3] = c2[3].inv()
+            key.decryptCompactWithNonce(c2, nonce)
+        }
+
+        assertThrows<IllegalArgumentException> {
+            key.encryptCompactWithNonce(src, nonce.dropLast(1).toUByteArray())
+        }
+        assertThrows<DecryptionFailedException> {
+            key.decryptCompactWithNonce(cipher, nonce.dropLast(1).toUByteArray())
+        }
+    }
+
     @Test
     fun keyExchangeTest() = runTest {
         initCrypto()