Update Xof.Utils with ability to pass 32 bit numbers

README.md

@@ -3,7 +3,6 @@
 [![badge-latest-release]][url-latest-release]
 
 [![badge-kotlin]][url-kotlin]
-[![badge-endians]][url-endians]
 
 ![badge-platform-android]
 ![badge-platform-jvm]
@@ -242,7 +241,6 @@ dependencies {
 
 <!-- TAG_DEPENDENCIES -->
 [badge-kotlin]: https://img.shields.io/badge/kotlin-1.9.24-blue.svg?logo=kotlin
-[badge-endians]: https://img.shields.io/badge/kotlincrypto.endians-0.3.1-blue.svg
 
 <!-- TAG_PLATFORMS -->
 [badge-platform-android]: http://img.shields.io/badge/-android-6EDB8D.svg?style=flat
@@ -266,7 +264,6 @@ dependencies {
 [url-license]: https://www.apache.org/licenses/LICENSE-2.0.txt
 [url-kotlin]: https://kotlinlang.org
 [url-kotlin-crypto]: https://github.com/KotlinCrypto
-[url-endians]: https://github.com/KotlinCrypto/endians
 [url-hash]: https://github.com/KotlinCrypto/hash
 [url-macs]: https://github.com/KotlinCrypto/MACs
 [url-version-catalog]: https://github.com/KotlinCrypto/version-catalog

benchmarks/README.md

@@ -1,7 +1,6 @@
 # benchmarks
 
-Benchmarks for tracking performance of `core` implementation. Currently, the only 
-thing worth benchmarking is the `Digest` implementation.
+Benchmarks for tracking performance of `core` implementation.
 
 **NOTE:** Benchmarking is run on every Pull Request. Results can be viewed for each
 workflow run on the [GitHub Actions][url-actions] tab of the repository.

benchmarks/build.gradle.kts

@@ -55,6 +55,7 @@ kmpConfiguration {
                 dependencies {
                     implementation(libs.benchmark.runtime)
                     implementation(project(":library:digest"))
+                    implementation(project(":library:xof"))
                 }
             }
         }

benchmarks/src/commonMain/kotlin/org/kotlincrypto/core/benchmarks/XofOps.kt

@@ -0,0 +1,45 @@
+/*
+ * Copyright (c) 2025 Matthew Nelson
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ **/
+package org.kotlincrypto.core.benchmarks
+
+import kotlinx.benchmark.*
+import org.kotlincrypto.core.InternalKotlinCryptoApi
+import org.kotlincrypto.core.xof.Xof
+import kotlin.random.Random
+
+@State(Scope.Benchmark)
+@BenchmarkMode(Mode.AverageTime)
+@OutputTimeUnit(BenchmarkTimeUnit.NANOSECONDS)
+@Warmup(iterations = 5, time = 2)
+@Measurement(iterations = 5, time = 3)
+@OptIn(InternalKotlinCryptoApi::class)
+open class XofUtilsBenchmark {
+
+    private val longs: LongArray = LongArray(10) { Random.Default.nextLong() }
+    private val loHi = Array(longs.size) { longs[it].let { l -> l.toInt() to l.rotateLeft(32).toInt() } }
+
+    @Benchmark
+    fun leftEncodeLongs() {
+        val longs = longs
+        longs.forEach { long -> Xof.Utils.leftEncode(long) }
+    }
+
+    @Benchmark
+    fun leftEncodeLoHi() {
+        val loHi = loHi
+        loHi.forEach { Xof.Utils.leftEncode(it.first, it.second) }
+    }
+}

gradle/libs.versions.toml

@@ -8,15 +8,11 @@ gradle-kmp-configuration = "0.3.2"
 gradle-kotlin = "1.9.24"
 gradle-publish-maven = "0.29.0"
 
-kotlincrypto-endians = "0.3.1"
-
 [libraries]
 gradle-kmp-configuration = { module = "io.matthewnelson:gradle-kmp-configuration-plugin", version.ref = "gradle-kmp-configuration" }
 gradle-kotlin = { module = "org.jetbrains.kotlin:kotlin-gradle-plugin", version.ref = "gradle-kotlin" }
 gradle-publish-maven = { module = "com.vanniktech:gradle-maven-publish-plugin", version.ref = "gradle-publish-maven" }
 
-kotlincrypto-endians-endians = { module = "org.kotlincrypto.endians:endians", version.ref = "kotlincrypto-endians" }
-
 # tests & tools
 androidx-test-runner = { module = "androidx.test:runner", version.ref = "androidx-test-runner" }
 benchmark-runtime = { module = "org.jetbrains.kotlinx:kotlinx-benchmark-runtime", version.ref = "gradle-benchmark" }

library/xof/api/xof.api

@@ -24,7 +24,11 @@ public abstract class org/kotlincrypto/core/xof/Xof$Reader {
 
 public final class org/kotlincrypto/core/xof/Xof$Utils {
 	public static final field INSTANCE Lorg/kotlincrypto/core/xof/Xof$Utils;
+	public static final fun leftEncode (I)[B
+	public static final fun leftEncode (II)[B
 	public static final fun leftEncode (J)[B
+	public static final fun rightEncode (I)[B
+	public static final fun rightEncode (II)[B
 	public static final fun rightEncode (J)[B
 }
 

library/xof/api/xof.klib.api

@@ -56,7 +56,11 @@ sealed class <#A: org.kotlincrypto.core.xof/XofAlgorithm> org.kotlincrypto.core.
     }
 
     final object Utils { // org.kotlincrypto.core.xof/Xof.Utils|null[0]
+        final fun leftEncode(kotlin/Int): kotlin/ByteArray // org.kotlincrypto.core.xof/Xof.Utils.leftEncode|leftEncode(kotlin.Int){}[0]
+        final fun leftEncode(kotlin/Int, kotlin/Int): kotlin/ByteArray // org.kotlincrypto.core.xof/Xof.Utils.leftEncode|leftEncode(kotlin.Int;kotlin.Int){}[0]
         final fun leftEncode(kotlin/Long): kotlin/ByteArray // org.kotlincrypto.core.xof/Xof.Utils.leftEncode|leftEncode(kotlin.Long){}[0]
+        final fun rightEncode(kotlin/Int): kotlin/ByteArray // org.kotlincrypto.core.xof/Xof.Utils.rightEncode|rightEncode(kotlin.Int){}[0]
+        final fun rightEncode(kotlin/Int, kotlin/Int): kotlin/ByteArray // org.kotlincrypto.core.xof/Xof.Utils.rightEncode|rightEncode(kotlin.Int;kotlin.Int){}[0]
         final fun rightEncode(kotlin/Long): kotlin/ByteArray // org.kotlincrypto.core.xof/Xof.Utils.rightEncode|rightEncode(kotlin.Long){}[0]
     }
 }

library/xof/build.gradle.kts

@@ -22,7 +22,6 @@ kmpConfiguration {
         common {
             sourceSetMain {
                 dependencies {
-                    implementation(libs.kotlincrypto.endians.endians)
                     api(project(":library:core"))
                 }
             }

library/xof/src/commonMain/kotlin/org/kotlincrypto/core/xof/Xof.kt

@@ -16,7 +16,6 @@
 package org.kotlincrypto.core.xof
 
 import org.kotlincrypto.core.*
-import org.kotlincrypto.endians.BigEndian.Companion.toBigEndian
 import kotlin.jvm.JvmName
 import kotlin.jvm.JvmOverloads
 import kotlin.jvm.JvmStatic
@@ -204,50 +203,82 @@ public sealed class Xof<A: XofAlgorithm>: Algorithm, Copyable<Xof<A>>, Resettabl
     public object Utils {
 
         @JvmStatic
-        public fun leftEncode(value: Long): ByteArray {
-            // If it's zero, return early with [1, 0]
-            if (value == 0L) return ByteArray(2).apply { this[0] = 1 }
-
-            val be = value.toBigEndian()
+        public fun leftEncode(value: Int): ByteArray {
+            return encode(lo = value, hi = 0, left = true)
+        }
 
-            // Find index of first non-zero byte
-            var i = 0
-            while (i < be.size && be[i] == 0.toByte()) {
-                i++
-            }
+        @JvmStatic
+        public fun leftEncode(value: Long): ByteArray {
+            val lo = value.toInt()
+            val hi = value.rotateLeft(32).toInt()
+            return encode(lo = lo, hi = hi, left = true)
+        }
 
-            val b = ByteArray(be.size - i + 1)
+        @JvmStatic
+        public fun leftEncode(lo: Int, hi: Int): ByteArray {
+            return encode(lo = lo, hi = hi, left = true)
+        }
 
-            // Prepend with number of non-zero bytes
-            b[0] = (be.size - i).toByte()
+        @JvmStatic
+        public fun rightEncode(value: Int): ByteArray {
+            return encode(lo = value, hi = 0, left = false)
+        }
 
-            be.copyInto(b, 1, i)
+        @JvmStatic
+        public fun rightEncode(value: Long): ByteArray {
+            val lo = value.toInt()
+            val hi = value.rotateLeft(32).toInt()
+            return encode(lo = lo, hi = hi, left = false)
+        }
 
-            return b
+        @JvmStatic
+        public fun rightEncode(lo: Int, hi: Int): ByteArray {
+            return encode(lo = lo, hi = hi, left = false)
         }
 
         @JvmStatic
-        public fun rightEncode(value: Long): ByteArray {
-            // If it's zero, return early with [0, 1]
-            if (value == 0L) return ByteArray(2).apply { this[1] = 1 }
+        private fun encode(lo: Int, hi: Int, left: Boolean): ByteArray {
+            if (lo == 0 && hi == 0) {
+                // If it's zero, return early
+                return if (left) byteArrayOf(1, 0) else byteArrayOf(0, 1)
+            }
 
-            val be = value.toBigEndian()
+            val a = byteArrayOf(
+                (hi ushr 24).toByte(),
+                (hi ushr 16).toByte(),
+                (hi ushr  8).toByte(),
+                (hi        ).toByte(),
+                (lo ushr 24).toByte(),
+                (lo ushr 16).toByte(),
+                (lo ushr  8).toByte(),
+                (lo        ).toByte(),
+            )
 
             // Find index of first non-zero byte
             var i = 0
-            while (i < be.size && be[i] == 0.toByte()) {
+            while (i < a.size && a[i] == ZERO) {
                 i++
             }
 
-            val b = ByteArray(be.size - i + 1)
-
-            // Append with number of non-zero bytes
-            b[b.lastIndex] = (be.size - i).toByte()
+            val b = ByteArray(a.size - i + 1)
+            val num = (a.size - i).toByte()
+
+            val offset = if (left) {
+                // Prepend with number of non-zero bytes
+                b[0] = num
+                1
+            } else {
+                // Append with number of non-zero bytes
+                b[b.lastIndex] = num
+                0
+            }
 
-            be.copyInto(b, 0, i)
+            a.copyInto(b, offset, i)
 
             return b
         }
+
+        private const val ZERO: Byte = 0
     }
 
     protected abstract fun newReader(): Reader

library/xof/src/commonTest/kotlin/org/kotlincrypto/core/xof/XofUtilsUnitTest.kt

@@ -22,17 +22,60 @@ import kotlin.test.assertContentEquals
 @OptIn(InternalKotlinCryptoApi::class)
 class XofUtilsUnitTest {
 
+    private sealed class Data private constructor() {
+        class L(val value: Long): Data() {
+            override fun leftEncode(): ByteArray = Xof.Utils.leftEncode(value)
+            override fun rightEncode(): ByteArray = Xof.Utils.rightEncode(value)
+        }
+        class I(val value: Int): Data() {
+            override fun leftEncode(): ByteArray = Xof.Utils.leftEncode(value)
+            override fun rightEncode(): ByteArray = Xof.Utils.rightEncode(value)
+        }
+        class LoHi(val lo: Int, val hi: Int): Data() {
+            override fun leftEncode(): ByteArray = Xof.Utils.leftEncode(lo = lo, hi = hi)
+            override fun rightEncode(): ByteArray = Xof.Utils.rightEncode(lo = lo, hi = hi)
+        }
+
+        abstract fun leftEncode(): ByteArray
+        abstract fun rightEncode(): ByteArray
+    }
+
+    @Test
+    fun givenValue_whenEncoded_thenIsAsExpected() {
+        listOf(
+            Data.L(777711L) to byteArrayOf(3, 11, -35, -17),
+            Data.L(-777711L) to byteArrayOf(8, -1, -1, -1, -1, -1, -12, 34, 17),
+            Data.LoHi(-777711, -1) to byteArrayOf(8, -1, -1, -1, -1, -1, -12, 34, 17),
+            Data.L(555L) to byteArrayOf(2, 2, 43),
+            Data.I(555) to byteArrayOf(2, 2, 43),
+            Data.L(Long.MIN_VALUE) to byteArrayOf(8, -128, 0, 0, 0, 0, 0, 0, 0),
+            Data.L(Long.MAX_VALUE) to byteArrayOf(8, 127, -1, -1, -1, -1, -1, -1, -1),
+        ).forEach { (data, expected) ->
+            assertContentEquals(expected, data.leftEncode())
+
+            // Shift expected for right encoding
+            var i = 0
+            while (i < expected.lastIndex) {
+                val old = expected[i]
+                val new = expected[i + 1]
+                expected[i] = new
+                expected[i + 1] = old
+                i++
+            }
+
+            assertContentEquals(expected, data.rightEncode())
+        }
+    }
+
     @Test
     fun givenLeftEncoding_whenValueZero_thenResultIsAsExpected() {
         val expected = ByteArray(2).apply { this[0] = 1 }
-        val actual = Xof.Utils.leftEncode(0L)
-        assertContentEquals(expected, actual)
+        assertContentEquals(expected, Xof.Utils.leftEncode(0L))
     }
 
     @Test
     fun givenRightEncoding_whenValueZero_thenResultIsAsExpected() {
         val expected = ByteArray(2).apply { this[1] = 1 }
-        val actual = Xof.Utils.rightEncode(0L)
-        assertContentEquals(expected, actual)
+        assertContentEquals(expected, Xof.Utils.rightEncode(0L))
     }
 }

library/xof/src/jvmMain/java9/module-info.java

@@ -1,7 +1,6 @@
 module org.kotlincrypto.core.xof {
     requires kotlin.stdlib;
     requires transitive org.kotlincrypto.core;
-    requires org.kotlincrypto.endians;
 
     exports org.kotlincrypto.core.xof;
 }