Merge pull request '1.4.0 release' (#4) from develop into main

Reviewed-on: Infendro/mac-kt#4

README.md

@@ -1,6 +1,6 @@
-# mac.kt
+# mac-kt
 
-`mac.kt` is a Kotlin Multiplatform library that provides common [Message Authentication Codes](https://en.wikipedia.org/wiki/Message_authentication_code).
+`mac-kt` is a Kotlin Multiplatform library that provides common [Message Authentication Codes](https://en.wikipedia.org/wiki/Message_authentication_code).
 
 Supported algorithms:
 - HMAC
@@ -15,7 +15,7 @@ repositories {
 }
 
 dependencies {
-    implementation("com.infendro:mac:1.5.0")
+    implementation("com.infendro:mac:1.4.0")
 }
 ```
 
@@ -24,7 +24,7 @@ dependencies {
 ```kotlin
 fun main() {
     // create an HMAC instance using SHA1
-    val hmac = HMAC(SHA1())
+    val hmac = HMAC(SHA1)
 
     // generate MAC
     val key = "secret".encodeToByteArray()

build.gradle.kts

@@ -5,7 +5,7 @@ import com.infendro.plugin.token
 import org.jetbrains.kotlin.gradle.ExperimentalWasmDsl
 
 group = "com.infendro"
-version = "1.5.0"
+version = "1.4.0"
 
 plugins {
     alias(libs.plugins.infendro)

gradle/libs.versions.toml

@@ -1,8 +1,8 @@
 [versions]
 infendro = "1.1.0"
 kotlin = "2.3.0"
-bytes = "1.4.1"
-hash = "1.7.0"
+bytes = "1.4.0"
+hash = "1.6.0"
 
 [plugins]
 infendro = { id = "com.infendro.plugin", version.ref = "infendro" }

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

@@ -5,59 +5,29 @@ import com.infendro.hash.HashFunction
 
 class HMAC(
     val function: HashFunction,
-) : MAC(function.bytes) {
-    private var initialized = false
-    private val innerPadding: ByteArray = ByteArray(function.block)
-    private val outerPadding: ByteArray = ByteArray(function.block)
-    private val inner: ByteArray = ByteArray(function.bytes)
+) : MAC {
+    override val bytes: Int
+        get() = function.bytes
 
-    override fun reset() {
-        function.reset()
-        initialized = false
-        innerPadding.fill(0x00)
-        outerPadding.fill(0x00)
+    override fun hashInto(key: ByteArray, value: ByteArray, destination: ByteArray, destinationOffset: Int) {
+        val paddedKey = pad(key)
+        val inner = ByteArray(function.block + value.size).also {
+            paddedKey.xorInto(0x36, it)
+            value.copyInto(it, function.block)
         }
-
-    override fun init(key: ByteArray) {
-        val padded = pad(key)
-        padded.xorInto(0x36, innerPadding)
-        padded.xorInto(0x5C, outerPadding)
-
-        function.reset()
-        function.update(innerPadding)
-
-        initialized = true
+        val outer = ByteArray(function.block + function.bytes).also {
+            paddedKey.xorInto(0x5C, it)
+            function.hashInto(inner, it, function.block)
         }
-
-    override fun update(byte: Byte) {
-        require(initialized)
-
-        function.update(byte)
-    }
-
-    override fun update(bytes: ByteArray) {
-        require(initialized)
-
-        function.update(bytes)
-    }
-
-    override fun digestInto(destination: ByteArray, destinationOffset: Int) {
-        require(initialized)
-
-        function.digestInto(inner)
-        function.update(outerPadding)
-        function.update(inner)
-        function.digestInto(destination, destinationOffset)
-
-        function.update(innerPadding)
+        function.hashInto(outer, destination, destinationOffset)
     }
 
     private fun pad(key: ByteArray): ByteArray {
-        val padded = ByteArray(function.block)
+        return ByteArray(function.block).also {
             when {
-            key.size > function.block -> function.hashInto(key, padded)
-            else -> key.copyInto(padded)
+                key.size > function.block -> function.hashInto(key, it)
+                else -> key.copyInto(it)
+            }
         }
-        return padded
     }
 }

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

@@ -1,38 +1,15 @@
 package com.infendro.mac
 
-abstract class MAC(
-    val bytes: Int,
-) {
+interface MAC {
+    val bytes: Int
     val bits: Int
         get() = bytes * 8
 
-    abstract fun reset()
-
-    abstract fun init(key: ByteArray)
-
-    abstract fun update(byte: Byte)
-    abstract fun update(bytes: ByteArray)
-
-    abstract fun digestInto(destination: ByteArray, destinationOffset: Int = 0)
-
-    fun digest(): ByteArray {
-        val result = ByteArray(bytes)
-        digestInto(result)
-        return result
-    }
-
-    fun hashInto(key: ByteArray, value: ByteArray, destination: ByteArray, destinationOffset: Int = 0) {
-        init(key)
-        update(value)
-        digestInto(destination, destinationOffset)
-        reset()
-    }
+    fun hashInto(key: ByteArray, value: ByteArray, destination: ByteArray, destinationOffset: Int = 0)
 
     fun hash(key: ByteArray, value: ByteArray): ByteArray {
-        init(key)
-        update(value)
-        val result = digest()
-        reset()
+        val result = ByteArray(bytes)
+        hashInto(key, value, result)
         return result
     }
 }

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

@@ -6,7 +6,7 @@ import kotlin.test.assertContentEquals
 import kotlin.test.assertEquals
 
 class `HMAC Test` {
-    val hmac = HMAC(`SHA-256`())
+    val hmac = HMAC(`SHA-256`)
 
     @Test
     fun bytes() {