From 659d2c49bd243a59322c59fb4307c1a873a1cd67 Mon Sep 17 00:00:00 2001
From: Paul Schaub <vanitasvitae@fsfe.org>
Date: Fri, 4 Aug 2023 17:01:54 +0200
Subject: [PATCH] Kotlin conversion: AEADAlgorithm

---
 .../pgpainless/algorithm/AEADAlgorithm.java   | 100 ------------------
 .../org/pgpainless/algorithm/AEADAlgorithm.kt |  30 ++++++
 2 files changed, 30 insertions(+), 100 deletions(-)
 delete mode 100644 pgpainless-core/src/main/java/org/pgpainless/algorithm/AEADAlgorithm.java
 create mode 100644 pgpainless-core/src/main/java/org/pgpainless/algorithm/AEADAlgorithm.kt

diff --git a/pgpainless-core/src/main/java/org/pgpainless/algorithm/AEADAlgorithm.java b/pgpainless-core/src/main/java/org/pgpainless/algorithm/AEADAlgorithm.java
deleted file mode 100644
index a5885005..00000000
--- a/pgpainless-core/src/main/java/org/pgpainless/algorithm/AEADAlgorithm.java
+++ /dev/null
@@ -1,100 +0,0 @@
-// SPDX-FileCopyrightText: 2022 Paul Schaub <vanitasvitae@fsfe.org>
-//
-// SPDX-License-Identifier: Apache-2.0
-
-package org.pgpainless.algorithm;
-
-import javax.annotation.Nonnull;
-import javax.annotation.Nullable;
-import java.util.HashMap;
-import java.util.Map;
-import java.util.NoSuchElementException;
-
-/**
- * List of AEAD algorithms defined in crypto-refresh-06.
- *
- * @see <a href="https://www.ietf.org/archive/id/draft-ietf-openpgp-crypto-refresh-06.html#name-aead-algorithms">
- *     Crypto-Refresh-06 §9.6 - AEAD Algorithms</a>
- */
-public enum AEADAlgorithm {
-
-    EAX(1, 16, 16),
-    OCB(2, 15, 16),
-    GCM(3, 12, 16),
-    ;
-
-    private final int algorithmId;
-    private final int ivLength;
-    private final int tagLength;
-
-    private static final Map<Integer, AEADAlgorithm> MAP = new HashMap<>();
-
-    static {
-        for (AEADAlgorithm h : AEADAlgorithm.values()) {
-            MAP.put(h.algorithmId, h);
-        }
-    }
-
-    AEADAlgorithm(int id, int ivLength, int tagLength) {
-        this.algorithmId = id;
-        this.ivLength = ivLength;
-        this.tagLength = tagLength;
-    }
-
-    /**
-     * Return the ID of the AEAD algorithm.
-     *
-     * @return algorithm ID
-     */
-    public int getAlgorithmId() {
-        return algorithmId;
-    }
-
-    /**
-     * Return the length (in octets) of the IV.
-     *
-     * @return iv length
-     */
-    public int getIvLength() {
-        return ivLength;
-    }
-
-    /**
-     * Return the length (in octets) of the authentication tag.
-     *
-     * @return tag length
-     */
-    public int getTagLength() {
-        return tagLength;
-    }
-
-    /**
-     * Return the {@link AEADAlgorithm} value that corresponds to the provided algorithm id.
-     * If an invalid algorithm id was provided, null is returned.
-     *
-     * @param id numeric id
-     * @return enum value
-     */
-    @Nullable
-    public static AEADAlgorithm fromId(int id) {
-        return MAP.get(id);
-    }
-
-    /**
-     * Return the  {@link AEADAlgorithm} value that corresponds to the provided algorithm id.
-     * If an invalid algorithm id was provided, throw a {@link NoSuchElementException}.
-     *
-     * @param id algorithm id
-     * @return enum value
-     * @throws NoSuchElementException in case of an unknown algorithm id
-     */
-    @Nonnull
-    public static AEADAlgorithm requireFromId(int id) {
-        AEADAlgorithm algorithm = fromId(id);
-        if (algorithm == null) {
-            throw new NoSuchElementException("No AEADAlgorithm found for id " + id);
-        }
-        return algorithm;
-    }
-
-}
diff --git a/pgpainless-core/src/main/java/org/pgpainless/algorithm/AEADAlgorithm.kt b/pgpainless-core/src/main/java/org/pgpainless/algorithm/AEADAlgorithm.kt
new file mode 100644
index 00000000..61672122
--- /dev/null
+++ b/pgpainless-core/src/main/java/org/pgpainless/algorithm/AEADAlgorithm.kt
@@ -0,0 +1,30 @@
+// SPDX-FileCopyrightText: 2023 Paul Schaub <info@pgpainless.org>
+//
+// SPDX-License-Identifier: Apache-2.0
+
+package org.pgpainless.algorithm
+
+enum class AEADAlgorithm(
+        val algorithmId: Int,
+        val ivLength: Int,
+        val tagLength: Int) {
+    EAX(1, 16, 16),
+    OCB(2, 15, 16),
+    GCM(3, 12, 16),
+    ;
+
+    companion object {
+        @JvmStatic
+        fun fromId(id: Int): AEADAlgorithm? {
+            return values().firstOrNull {
+                algorithm -> algorithm.algorithmId == id
+            }
+        }
+
+        @JvmStatic
+        fun requireFromId(id: Int): AEADAlgorithm {
+            return fromId(id) ?:
+            throw NoSuchElementException("No AEADAlgorithm found for id $id")
+        }
+    }
+}
\ No newline at end of file