add opt-in

build.gradle.kts

@@ -20,10 +20,16 @@ kotlin {
 
     sourceSets {
         commonMain.dependencies {
-            implementation(libs.hash)
+            implementation(libs.random)
             implementation(libs.mac)
+            implementation(libs.hash)
+            implementation(libs.bytearray)
         }
     }
+
+    compilerOptions {
+        freeCompilerArgs.add("-opt-in=kotlin.time.ExperimentalTime")
+    }
 }
 
 publishing {

gradle/libs.versions.toml

@@ -1,11 +1,15 @@
 [versions]
 kotlin = "2.1.20"
-hash = "1.1.0"
-mac = "1.1.0"
+random = "1.0.0"
+mac = "1.1.2"
+hash = "1.2.2"
+bytearray = "1.1.1"
 
 [plugins]
 multiplatform = { id = "org.jetbrains.kotlin.multiplatform", version.ref = "kotlin" }
 
 [libraries]
-hash = { module = "com.infendro:hash", version.ref = "hash" }
+random = { module = "com.infendro:random", version.ref = "random" }
 mac = { module = "com.infendro:mac", version.ref = "mac" }
+hash = { module = "com.infendro:hash", version.ref = "hash" }
+bytearray = { module = "com.infendro:bytearray", version.ref = "bytearray" }

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

@@ -1,10 +1,10 @@
 package com.infendro.otp
 
+import com.infendro.bytearray.toByteArray
+import com.infendro.bytearray.toInt
 import com.infendro.hash.HashFunction
 import com.infendro.hash.SHA1
 import com.infendro.mac.HMAC
-import com.infendro.otp.util.toByteArray
-import com.infendro.otp.util.toInt
 import kotlin.experimental.and
 import kotlin.math.pow
 
@@ -24,8 +24,7 @@ class HOTP(
         secret: ByteArray,
         counter: Long,
     ): String {
-        if (counter < 0)
-            throw Exception()
+        if (counter < 0) throw Exception()
 
         val hash = generateHash(
             secret,

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

@@ -1,10 +1,10 @@
 package com.infendro.otp
 
 import com.infendro.hash.*
-import kotlin.random.Random
+import com.infendro.random.PRNG
 
 object SecretGenerator {
-    private val random = Random.Default
+    private val random = PRNG.HMAC
 
     fun generate(
         algorithm: HashFunction = SHA1,

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

@@ -4,10 +4,8 @@ import com.infendro.hash.HashFunction
 import com.infendro.hash.SHA1
 import kotlin.time.Duration
 import kotlin.time.Duration.Companion.seconds
-import kotlin.time.ExperimentalTime
 import kotlin.time.Instant
 
-@ExperimentalTime
 class TOTP(
     function: HashFunction = SHA1,
     length: Int = 6,

src/commonMain/kotlin/com/infendro/otp/util/ByteArray.kt

@@ -1,20 +0,0 @@
-package com.infendro.otp.util
-
-internal fun Long.toByteArray(): ByteArray {
-    return ByteArray(8) { i ->
-        val offset = (7 - i) * 8
-        (this shr offset).toByte()
-    }
-}
-
-internal fun ByteArray.toInt(): Int {
-    if (size != 4) throw Exception()
-
-    return fold(0) { acc, byte ->
-        (acc shl 8) or (byte.toInt() and 0xFF)
-    }
-}
-
-internal fun Collection<Byte>.toInt(): Int {
-    return toByteArray().toInt()
-}