update dependencies, use common plugin

src/commonMain/kotlin/com/infendro/otp/TOTP.kt

@@ -1,20 +1,20 @@
 package com.infendro.otp
 
 import com.infendro.hash.HashFunction
-import com.infendro.hash.SHA1
+import com.infendro.hash.sha1.SHA1
 import kotlin.time.Duration
 import kotlin.time.Duration.Companion.seconds
 import kotlin.time.Instant
 
 class TOTP(
-    function: HashFunction = SHA1,
-    length: Int = 6,
+    val function: HashFunction = SHA1,
+    val length: Int = 6,
     val period: Duration = 30.seconds,
 ) {
-    val hotp = HOTP(function, length)
+    private val hotp = HOTP(function, length)
 
     fun verify(
-        secret: ByteArray,
+        secret: UByteArray,
         instant: Instant,
         otp: String,
     ): Boolean {
@@ -22,13 +22,10 @@ class TOTP(
     }
 
     fun generate(
-        secret: ByteArray,
+        secret: UByteArray,
         instant: Instant,
     ): String {
-        return hotp.generate(
-            secret,
-            counter(instant)
-        )
+        return hotp.generate(secret, counter(instant))
     }
 
     private fun counter(