README.md

@@ -1,19 +1,10 @@
 # mac-kt
 
-`mac-kt` is a Kotlin Multiplatform library that provides common [Message Authentication Code](https://en.wikipedia.org/wiki/Message_authentication_code) algorithms.
+`mac-kt` is a Kotlin Multiplatform library that provides common [Message Authentication Codes](https://en.wikipedia.org/wiki/Message_authentication_code).
 
 Supported algorithms:
 - HMAC
 
-## Targets
-
-| Target           | Status        |
-|------------------|---------------|
-| JVM              | Supported     |
-| JavaScript       | Supported     |
-| Native (Linux)   | Supported     |
-| Native (Windows) | Not Supported |
-
 ## Installation
 
 Add the following to your `build.gradle.kts`.
@@ -31,18 +22,13 @@ dependencies {
 ## Usage
 
 ```kotlin
-import com.infendro.hash.sha1.SHA1
-import com.infendro.mac.HMAC
-
 fun main() {
     // create an HMAC instance using SHA1
     val hmac = HMAC(SHA1)
 
     // generate MAC
-    val key = "secret"
+    val key = "secret".encodeToByteArray()
-        .encodeToByteArray().asUByteArray()
+    val value = "Hello World!".encodeToByteArray()
-    val value = "Hello World!"
-        .encodeToByteArray().asUByteArray()
     val mac = hmac.hash(key, value)
 }
 ```

build.gradle.kts

@@ -25,7 +25,7 @@ kotlin {
     sourceSets {
         commonMain.dependencies {
             implementation(libs.hash)
-            implementation(libs.bytearray)
+            implementation(libs.bytes)
         }
         commonTest.dependencies {
             implementation(libs.test)

gradle/libs.versions.toml

@@ -1,8 +1,8 @@
 [versions]
-infendro = "1.0.0"
+infendro = "1.1.0"
-kotlin = "2.2.21"
+kotlin = "2.3.0"
-hash = "1.3.2"
+hash = "1.5.1"
-bytearray = "1.2.4"
+bytes = "1.3.3"
 
 [plugins]
 infendro = { id = "com.infendro.plugin", version.ref = "infendro" }
@@ -10,5 +10,5 @@ multiplatform = { id = "org.jetbrains.kotlin.multiplatform", version.ref = "kotl
 
 [libraries]
 hash = { module = "com.infendro:hash", version.ref = "hash" }
-bytearray = { module = "com.infendro:bytearray", version.ref = "bytearray" }
+bytes = { module = "com.infendro:bytes", version.ref = "bytes" }
 test = { module = "org.jetbrains.kotlin:kotlin-test", version.ref = "kotlin" }

src/commonMain/kotlin/com/infendro/mac/HMAC.kt

@@ -1,6 +1,6 @@
 package com.infendro.mac
 
-import com.infendro.bytearray.padEnd
+import com.infendro.bytes.bytearray.xorInto
 import com.infendro.hash.HashFunction
 
 class HMAC(
@@ -9,25 +9,24 @@ class HMAC(
     override val bytes: Int
         get() = function.bytes
 
-    override fun hash(
+    override fun hashInto(key: ByteArray, value: ByteArray, destination: ByteArray, destinationOffset: Int) {
-        key: UByteArray,
-        value: UByteArray,
-    ): UByteArray {
         val paddedKey = pad(key)
-
+        val inner = ByteArray(function.block + value.size).also {
-        val innerKey = paddedKey.map { it xor 0x36U }.toUByteArray()
+            paddedKey.xorInto(0x36, it)
-        val outerKey = paddedKey.map { it xor 0x5CU }.toUByteArray()
+            value.copyInto(it, function.block)
-
-        return function.hash(outerKey + function.hash(innerKey + value))
-    }
-
-    private fun pad(
-        key: UByteArray,
-    ): UByteArray {
-        return when {
-            key.size > function.block -> function.hash(key)
-            key.size < function.block -> key.padEnd(function.block, 0x00U)
-            else -> key
         }
+        val outer = ByteArray(function.block + function.bytes).also {
+            paddedKey.xorInto(0x5C, it)
+            function.hashInto(inner, it, function.block)
+        }
+        function.hashInto(outer, destination, destinationOffset)
     }
+
+    private fun pad(key: ByteArray): ByteArray =
+        ByteArray(function.block).also {
+            when {
+                key.size > function.block -> function.hashInto(key, it)
+                else -> key.copyInto(it)
+            }
+        }
 }

src/commonMain/kotlin/com/infendro/mac/MAC.kt

@@ -5,8 +5,20 @@ interface MAC {
     val bits: Int
         get() = bytes * 8
 
-    fun hash(
+    fun hashInto(key: ByteArray, value: ByteArray, destination: ByteArray, destinationOffset: Int = 0)
-        key: UByteArray,
+
-        value: UByteArray,
+    fun hashInto(key: ByteArray, value: ByteArray, destination: UByteArray, destinationOffset: Int = 0) =
-    ): UByteArray
+        hashInto(key, value, destination.asByteArray(), destinationOffset)
+
+    fun hashInto(key: UByteArray, value: UByteArray, destination: ByteArray, destinationOffset: Int = 0) =
+        hashInto(key.asByteArray(), value.asByteArray(), destination, destinationOffset)
+
+    fun hashInto(key: UByteArray, value: UByteArray, destination: UByteArray, destinationOffset: Int = 0) =
+        hashInto(key.asByteArray(), value.asByteArray(), destination.asByteArray(), destinationOffset)
+
+    fun hash(key: ByteArray, value: ByteArray): ByteArray =
+        ByteArray(bytes).also { hashInto(key, value, it) }
+
+    fun hash(key: UByteArray, value: UByteArray): UByteArray =
+        UByteArray(bytes).also { hashInto(key, value, it) }
 }

src/commonTest/kotlin/com/infendro/mac/HMAC.kt

@@ -1,6 +1,5 @@
 package com.infendro.mac
 
-import com.infendro.bytearray.encodeToUByteArray
 import com.infendro.hash.sha2.`SHA-256`
 import kotlin.test.Test
 import kotlin.test.assertContentEquals
@@ -16,22 +15,21 @@ class `HMAC Test` {
     }
 
     @Test
-    fun `example`() {
+    fun example() {
-        assertContentEquals(
+        val expected = ubyteArrayOf(
-            ubyteArrayOf(
+            0xf7U, 0xbcU, 0x83U, 0xf4U,
-                0xf7U, 0xbcU, 0x83U, 0xf4U,
+            0x30U, 0x53U, 0x84U, 0x24U,
-                0x30U, 0x53U, 0x84U, 0x24U,
+            0xb1U, 0x32U, 0x98U, 0xe6U,
-                0xb1U, 0x32U, 0x98U, 0xe6U,
+            0xaaU, 0x6fU, 0xb1U, 0x43U,
-                0xaaU, 0x6fU, 0xb1U, 0x43U,
+            0xefU, 0x4dU, 0x59U, 0xa1U,
-                0xefU, 0x4dU, 0x59U, 0xa1U,
+            0x49U, 0x46U, 0x17U, 0x59U,
-                0x49U, 0x46U, 0x17U, 0x59U,
+            0x97U, 0x47U, 0x9dU, 0xbcU,
-                0x97U, 0x47U, 0x9dU, 0xbcU,
+            0x2dU, 0x1aU, 0x3cU, 0xd8U,
-                0x2dU, 0x1aU, 0x3cU, 0xd8U,
+        ).asByteArray()
-            ),
+        val actual = hmac.hash(
-            hmac.hash(
+            "key".encodeToByteArray(),
-                "key".encodeToUByteArray(),
+            "The quick brown fox jumps over the lazy dog".encodeToByteArray(),
-                "The quick brown fox jumps over the lazy dog".encodeToUByteArray()
-            )
         )
+        assertContentEquals(expected, actual)
     }
 }