Initial AES-CTR API refactoring

multiplatform-crypto-api/src/commonMain/kotlin/com/ionspin/kotlin/crypto/symmetric/Mode.kt

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+/*
+ *    Copyright 2019 Ugljesa Jovanovic
+ *
+ *    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
+ *
+ *        http://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 com.ionspin.kotlin.crypto.symmetric
+
+/**
+ * Created by Ugljesa Jovanovic
+ * ugljesa.jovanovic@ionspin.com
+ * on 18-Sep-2019
+ */
+
+enum class Mode {
+    ENCRYPT, DECRYPT
+}

multiplatform-crypto-api/src/commonMain/kotlin/com/ionspin/kotlin/crypto/symmetric/aes/Aes.kt

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+package com.ionspin.kotlin.crypto.symmetric.aes
+
+/**
+ * Created by Ugljesa Jovanovic
+ * ugljesa.jovanovic@ionspin.com
+ * on 13-Jun-2020
+ */
+sealed class AesKey(val key: String, val keyLength: Int) {
+    val keyArray: UByteArray = key.chunked(2).map { it.toUByte(16) }.toUByteArray()
+    val numberOf32BitWords = keyLength / 32
+
+    class Aes128Key(key: String) : AesKey(key, 128)
+    class Aes192Key(key: String) : AesKey(key, 192)
+    class Aes256Key(key: String) : AesKey(key, 256)
+
+    init {
+        checkKeyLength(key, keyLength)
+    }
+
+    fun checkKeyLength(key: String, expectedLength: Int) {
+        if ((key.length / 2) != expectedLength / 8) {
+            throw RuntimeException("Invalid key length")
+        }
+    }
+}
+

multiplatform-crypto-api/src/commonMain/kotlin/com/ionspin/kotlin/crypto/symmetric/aes/AesCtr.kt

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+package com.ionspin.kotlin.crypto.symmetric.aes
+
+/**
+ * Created by Ugljesa Jovanovic
+ * ugljesa.jovanovic@ionspin.com
+ * on 13-Jun-2020
+ */
+interface SimpleUpdateableAesCtr {
+    fun update(data: UByteArray)
+
+    fun process() : UByteArray
+
+}
+
+interface AdvancedUpdateableAesCtr : SimpleUpdateableAesCtr {
+    fun update(data: UByteArray, counter : UByteArray) : UByteArray
+}
+
+interface SimpleStatelessAesCtr {
+
+    fun encrypt(aesKey: AesKey, data: UByteArray) : EncryptedDataAndInitialCounter
+
+    fun decrypt(aesKey: AesKey, encryptedDataAndInitialCounter: EncryptedDataAndInitialCounter) : UByteArray
+
+}
+
+interface AdvancedStatelessAesCtr : SimpleStatelessAesCtr {
+    fun encrypt(aesKey: AesKey, data: UByteArray, initialCounter: UByteArray) : EncryptedDataAndInitialCounter
+}
+
+data class EncryptedDataAndInitialCounter(val encryptedData : UByteArray, val initialCounter : UByteArray) {
+    override fun equals(other: Any?): Boolean {
+        if (this === other) return true
+        if (other == null || this::class != other::class) return false
+
+        other as EncryptedDataAndInitialCounter
+
+        if (!encryptedData.contentEquals(other.encryptedData)) return false
+        if (!initialCounter.contentEquals(other.initialCounter)) return false
+
+        return true
+    }
+
+    override fun hashCode(): Int {
+        var result = encryptedData.contentHashCode()
+        result = 31 * result + initialCounter.contentHashCode()
+        return result
+    }
+}
+
+data class EncryptedDataAndInitializationVector(val encryptedData : UByteArray, val initializationVector : UByteArray) {
+    override fun equals(other: Any?): Boolean {
+        if (this === other) return true
+        if (other == null || this::class != other::class) return false
+
+        other as EncryptedDataAndInitializationVector
+
+        if (!encryptedData.contentEquals(other.encryptedData)) return false
+        if (!initializationVector.contentEquals(other.initializationVector)) return false
+
+        return true
+    }
+
+    override fun hashCode(): Int {
+        var result = encryptedData.contentHashCode()
+        result = 31 * result + initializationVector.contentHashCode()
+        return result
+    }
+}