Add support for signed master indexes

This commit also changes the way the master index format detection
works, as the previous scheme could not distinguish VERSIONED from
WHIRLPOOL.

Signed-off-by: Graham <gpe@openrs2.org>

archive/src/main/kotlin/org/openrs2/archive/cache/CacheImporter.kt

@@ -64,7 +64,6 @@ public class CacheImporter @Inject constructor(
 
     public suspend fun import(
         store: Store,
-        masterIndexFormat: MasterIndexFormat?,
         game: String,
         build: Int?,
         timestamp: Instant?,
@@ -77,7 +76,7 @@ public class CacheImporter @Inject constructor(
             val gameId = getGameId(connection, game)
 
             // import master index
-            val masterIndex = createMasterIndex(store, masterIndexFormat)
+            val masterIndex = createMasterIndex(store)
             try {
                 addMasterIndex(connection, masterIndex, gameId, build, timestamp, name, description, false)
             } finally {
@@ -316,11 +315,11 @@ public class CacheImporter @Inject constructor(
         }
     }
 
-    private fun createMasterIndex(store: Store, format: MasterIndexFormat?): MasterIndex {
+    private fun createMasterIndex(store: Store): MasterIndex {
         val index = Js5MasterIndex.create(store)
 
         alloc.buffer().use { uncompressed ->
-            index.write(uncompressed, format ?: index.minimumFormat)
+            index.write(uncompressed)
 
             Js5Compression.compress(uncompressed, Js5CompressionType.UNCOMPRESSED).use { buf ->
                 return MasterIndex(index, buf.retain())

archive/src/main/kotlin/org/openrs2/archive/cache/ImportCommand.kt

@@ -3,18 +3,15 @@ package org.openrs2.archive.cache
 import com.github.ajalt.clikt.core.CliktCommand
 import com.github.ajalt.clikt.parameters.arguments.argument
 import com.github.ajalt.clikt.parameters.options.option
-import com.github.ajalt.clikt.parameters.types.enum
 import com.github.ajalt.clikt.parameters.types.int
 import com.github.ajalt.clikt.parameters.types.path
 import com.google.inject.Guice
 import kotlinx.coroutines.runBlocking
 import org.openrs2.archive.ArchiveModule
-import org.openrs2.cache.MasterIndexFormat
 import org.openrs2.cache.Store
 import org.openrs2.cli.instant
 
 public class ImportCommand : CliktCommand(name = "import") {
-    private val masterIndexFormat by option().enum<MasterIndexFormat>()
     private val build by option().int()
     private val timestamp by option().instant()
     private val name by option()
@@ -32,7 +29,7 @@ public class ImportCommand : CliktCommand(name = "import") {
         val importer = injector.getInstance(CacheImporter::class.java)
 
         Store.open(input).use { store ->
-            importer.import(store, masterIndexFormat, game, build, timestamp, name, description)
+            importer.import(store, game, build, timestamp, name, description)
         }
     }
 }

cache/src/main/kotlin/org/openrs2/cache/Js5MasterIndex.kt

@@ -1,36 +1,113 @@
 package org.openrs2.cache
 
 import io.netty.buffer.ByteBuf
+import io.netty.buffer.ByteBufUtil
+import org.bouncycastle.crypto.params.RSAKeyParameters
 import org.openrs2.buffer.crc32
 import org.openrs2.buffer.use
+import org.openrs2.crypto.Rsa
+import org.openrs2.crypto.Whirlpool
+import org.openrs2.crypto.rsaDecrypt
+import org.openrs2.crypto.rsaEncrypt
+import org.openrs2.crypto.whirlpool
 
-public inline class Js5MasterIndex(public val entries: MutableList<Entry> = mutableListOf()) {
-    public data class Entry(public var version: Int, public var checksum: Int)
+public data class Js5MasterIndex(
+    public var format: MasterIndexFormat,
+    public val entries: MutableList<Entry> = mutableListOf()
+) {
+    public class Entry(
+        public var version: Int,
+        public var checksum: Int,
+        digest: ByteArray?
+    ) {
+        public var digest: ByteArray? = digest
+            set(value) {
+                require(value == null || value.size == Whirlpool.DIGESTBYTES)
+                field = value
+            }
 
-    public val minimumFormat: MasterIndexFormat
-        get() {
-            for (entry in entries) {
-                if (entry.version != 0) {
-                    return MasterIndexFormat.VERSIONED
+        override fun equals(other: Any?): Boolean {
+            if (this === other) return true
+            if (javaClass != other?.javaClass) return false
+
+            other as Entry
+
+            if (version != other.version) return false
+            if (checksum != other.checksum) return false
+            if (digest != null) {
+                if (other.digest == null) return false
+                if (!digest.contentEquals(other.digest)) return false
+            } else if (other.digest != null) return false
+
+            return true
+        }
+
+        override fun hashCode(): Int {
+            var result = version
+            result = 31 * result + checksum
+            result = 31 * result + (digest?.contentHashCode() ?: 0)
+            return result
+        }
+
+        override fun toString(): String {
+            val digest = digest
+            val hex = if (digest != null) {
+                ByteBufUtil.hexDump(digest)
+            } else {
+                "null"
+            }
+            return "Entry(version=$version, checksum=$checksum, digest=$hex)"
         }
     }
 
-            return MasterIndexFormat.ORIGINAL
+    public fun write(buf: ByteBuf, key: RSAKeyParameters? = null) {
+        val start = buf.writerIndex()
+
+        if (format >= MasterIndexFormat.WHIRLPOOL) {
+            buf.writeByte(entries.size)
         }
 
-    public fun write(buf: ByteBuf, format: MasterIndexFormat) {
         for (entry in entries) {
             buf.writeInt(entry.checksum)
 
             if (format >= MasterIndexFormat.VERSIONED) {
                 buf.writeInt(entry.version)
             }
+
+            if (format >= MasterIndexFormat.WHIRLPOOL) {
+                val digest = entry.digest
+                if (digest != null) {
+                    buf.writeBytes(digest)
+                } else {
+                    buf.writeZero(Whirlpool.DIGESTBYTES)
+                }
+            }
+        }
+
+        if (format >= MasterIndexFormat.WHIRLPOOL) {
+            val digest = buf.whirlpool(start, buf.writerIndex() - start)
+
+            if (key != null) {
+                buf.alloc().buffer(SIGNATURE_LENGTH, SIGNATURE_LENGTH).use { plaintext ->
+                    plaintext.writeByte(Rsa.MAGIC)
+                    plaintext.writeBytes(digest)
+
+                    plaintext.rsaEncrypt(key).use { ciphertext ->
+                        buf.writeBytes(ciphertext)
+                    }
+                }
+            } else {
+                buf.writeByte(Rsa.MAGIC)
+                buf.writeBytes(digest)
+            }
         }
     }
 
     public companion object {
+        private const val SIGNATURE_LENGTH = Whirlpool.DIGESTBYTES + 1
+
         public fun create(store: Store): Js5MasterIndex {
-            val index = Js5MasterIndex()
+            val masterIndex = Js5MasterIndex(MasterIndexFormat.ORIGINAL)
 
             var nextArchive = 0
             for (archive in store.list(Js5Archive.ARCHIVESET)) {
@@ -40,46 +117,111 @@ public inline class Js5MasterIndex(public val entries: MutableList<Entry> = muta
                  * entries with a zero CRC are probably invalid.
                  */
                 for (i in nextArchive until archive) {
-                    index.entries += Entry(0, 0)
+                    masterIndex.entries += Entry(0, 0, null)
                 }
 
                 val entry = store.read(Js5Archive.ARCHIVESET, archive).use { buf ->
                     val checksum = buf.crc32()
+                    val digest = buf.whirlpool()
+
                     val version = Js5Compression.uncompress(buf).use { uncompressed ->
-                        Js5Index.read(uncompressed).version
+                        val index = Js5Index.read(uncompressed)
+
+                        if (index.hasDigests) {
+                            masterIndex.format = maxOf(masterIndex.format, MasterIndexFormat.WHIRLPOOL)
+                        } else if (index.protocol >= Js5Protocol.VERSIONED) {
+                            masterIndex.format = maxOf(masterIndex.format, MasterIndexFormat.VERSIONED)
                         }
+
+                        index.version
+                    }
+
                     // TODO(gpe): should we throw an exception if there are trailing bytes here or in the block above?
-                    Entry(version, checksum)
+                    Entry(version, checksum, digest)
                 }
 
-                index.entries += entry
+                masterIndex.entries += entry
                 nextArchive = archive + 1
             }
 
-            return index
+            return masterIndex
         }
 
-        public fun read(buf: ByteBuf, format: MasterIndexFormat): Js5MasterIndex {
-            when (format) {
+        public fun read(buf: ByteBuf, format: MasterIndexFormat, key: RSAKeyParameters? = null): Js5MasterIndex {
+            val index = Js5MasterIndex(format)
+
+            val start = buf.readerIndex()
+            val len = buf.readableBytes()
+
+            val archives = when (format) {
                 MasterIndexFormat.ORIGINAL -> {
-                    require(buf.readableBytes() % 4 == 0)
+                    require(len % 4 == 0) {
+                        "Length is not a multiple of 4 bytes"
+                    }
+                    len / 4
                 }
                 MasterIndexFormat.VERSIONED -> {
-                    require(buf.readableBytes() % 8 == 0)
+                    require(len % 8 == 0) {
+                        "Length is not a multiple of 8 bytes"
+                    }
+                    len / 8
+                }
+                MasterIndexFormat.WHIRLPOOL -> {
+                    buf.readUnsignedByte().toInt()
                 }
             }
 
-            val index = Js5MasterIndex()
-            while (buf.isReadable) {
+            for (i in 0 until archives) {
                 val checksum = buf.readInt()
+
                 val version = if (format >= MasterIndexFormat.VERSIONED) {
                     buf.readInt()
                 } else {
                     0
                 }
-                index.entries += Entry(version, checksum)
+
+                val digest = if (format >= MasterIndexFormat.WHIRLPOOL) {
+                    val bytes = ByteArray(Whirlpool.DIGESTBYTES)
+                    buf.readBytes(bytes)
+                    bytes
+                } else {
+                    null
                 }
+
+                index.entries += Entry(version, checksum, digest)
+            }
+
+            val end = buf.readerIndex()
+
+            if (format >= MasterIndexFormat.WHIRLPOOL) {
+                val ciphertext = buf.readSlice(buf.readableBytes())
+                decrypt(ciphertext, key).use { plaintext ->
+                    require(plaintext.readableBytes() == SIGNATURE_LENGTH) {
+                        "Invalid signature length"
+                    }
+
+                    // the client doesn't verify what I presume is the RSA magic byte
+                    plaintext.skipBytes(1)
+
+                    val expected = ByteArray(Whirlpool.DIGESTBYTES)
+                    plaintext.readBytes(expected)
+
+                    val actual = buf.whirlpool(start, end - start)
+                    require(expected.contentEquals(actual)) {
+                        "Invalid signature"
+                    }
+                }
+            }
+
             return index
         }
+
+        private fun decrypt(buf: ByteBuf, key: RSAKeyParameters?): ByteBuf {
+            return if (key != null) {
+                buf.rsaDecrypt(key)
+            } else {
+                buf.retain()
+            }
+        }
     }
 }

cache/src/main/kotlin/org/openrs2/cache/MasterIndexFormat.kt

@@ -2,5 +2,6 @@ package org.openrs2.cache
 
 public enum class MasterIndexFormat {
     ORIGINAL,
-    VERSIONED
+    VERSIONED,
+    WHIRLPOOL
 }

cache/src/test/kotlin/org/openrs2/cache/Js5MasterIndexTest.kt

@@ -1,8 +1,10 @@
 package org.openrs2.cache
 
 import io.netty.buffer.ByteBufAllocator
+import io.netty.buffer.ByteBufUtil
 import io.netty.buffer.Unpooled
 import org.openrs2.buffer.use
+import org.openrs2.crypto.Rsa
 import java.nio.file.Path
 import kotlin.test.Test
 import kotlin.test.assertEquals
@@ -10,47 +12,169 @@ import kotlin.test.assertFailsWith
 
 object Js5MasterIndexTest {
     private val ROOT = Path.of(FlatFileStoreTest::class.java.getResource("master-index").toURI())
+    private val PRIVATE_KEY = Rsa.readPrivateKey(ROOT.resolve("private.key"))
+    private val PUBLIC_KEY = Rsa.readPublicKey(ROOT.resolve("public.key"))
 
-    private val encodedOriginal = byteArrayOf(0, 0, 0, 1, 0, 0, 0, 3, 0, 0, 0, 5)
+    private val encodedOriginal = ByteBufUtil.decodeHexDump("000000010000000300000005")
     private val decodedOriginal = Js5MasterIndex(
+        MasterIndexFormat.ORIGINAL,
         mutableListOf(
-            Js5MasterIndex.Entry(0, 1),
-            Js5MasterIndex.Entry(0, 3),
-            Js5MasterIndex.Entry(0, 5)
+            Js5MasterIndex.Entry(0, 1, null),
+            Js5MasterIndex.Entry(0, 3, null),
+            Js5MasterIndex.Entry(0, 5, null)
         )
     )
 
-    private val encodedVersioned = byteArrayOf(0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 3, 0, 0, 0, 2, 0, 0, 0, 5, 0, 0, 0, 4)
+    private val encodedVersioned = ByteBufUtil.decodeHexDump("000000010000000000000003000000020000000500000004")
     private val decodedVersioned = Js5MasterIndex(
+        MasterIndexFormat.VERSIONED,
         mutableListOf(
-            Js5MasterIndex.Entry(0, 1),
-            Js5MasterIndex.Entry(2, 3),
-            Js5MasterIndex.Entry(4, 5)
+            Js5MasterIndex.Entry(0, 1, null),
+            Js5MasterIndex.Entry(2, 3, null),
+            Js5MasterIndex.Entry(4, 5, null)
         )
     )
 
+    private val encodedWhirlpool = ByteBufUtil.decodeHexDump(
+        "01" +
+            "89abcdef" +
+            "01234567" +
+            "0e1a2b93c80a41c7ad2a985dff707a6a8ff82e229cbc468f04191198920955a1" +
+            "4b3d7eab77a17faf99208dee5b44afb789962ad79f230b3b59106a0af892219c" +
+            "0a" +
+            "ee8f66a2ce0b07de4d2b792eed26ae7a6c307b763891d085c63ea55b4c003bc0" +
+            "b3ecb77cc1a8f9ccd53c405b3264e598820b4940f630ff079a9feb950f639671"
+    )
+    private val decodedWhirlpool = Js5MasterIndex(
+        MasterIndexFormat.WHIRLPOOL,
+        mutableListOf(
+            Js5MasterIndex.Entry(
+                0x01234567, 0x89ABCDEF.toInt(), ByteBufUtil.decodeHexDump(
+                    "0e1a2b93c80a41c7ad2a985dff707a6a8ff82e229cbc468f04191198920955a1" +
+                        "4b3d7eab77a17faf99208dee5b44afb789962ad79f230b3b59106a0af892219c"
+                )
+            )
+        )
+    )
+
+    private val encodedWhirlpoolNullDigest = ByteBufUtil.decodeHexDump(
+        "01" +
+            "89abcdef" +
+            "01234567" +
+            "0000000000000000000000000000000000000000000000000000000000000000" +
+            "0000000000000000000000000000000000000000000000000000000000000000" +
+            "0a" +
+            "4a0e22540fb0a9bc06fe84bfb35f9281ba9fbd30288c3375c508ad741c4d4491" +
+            "8a65765bc2dce9d67029be79bd544f96055a41d725c080bc5b85a48b5aae6e4d"
+    )
+    private val decodedWhirlpoolNullDigest = Js5MasterIndex(
+        MasterIndexFormat.WHIRLPOOL,
+        mutableListOf(
+            Js5MasterIndex.Entry(0x01234567, 0x89ABCDEF.toInt(), null)
+        )
+    )
+
+    private val encodedSigned = ByteBufUtil.decodeHexDump(
+        "01" +
+            "89abcdef" +
+            "01234567" +
+            "0e1a2b93c80a41c7ad2a985dff707a6a8ff82e229cbc468f04191198920955a1" +
+            "4b3d7eab77a17faf99208dee5b44afb789962ad79f230b3b59106a0af892219c" +
+            "2134b1e637d4c9f3b7bdd446ad40cedb6d824cfb48f937ae0d6e2ba3977881ea" +
+            "ed02adae179ed89cea56e98772186bb569bb24a4951e441716df0d5d7199c088" +
+            "28974d43c3644e74bf29ec1435e425f6cb05aca14a84163c5b46b6e6a9362f22" +
+            "4f69f4a5888b3fe7aec0141da25b17c7f65069eed59f3be134fa1ade4e191b41" +
+            "d561447446cd1cc4d11e6499c49e00066173908491d8d2ff282aefa86e6c6b15" +
+            "dceb437d0436b6195ef60d4128e1e0184bf6929b73abd1a8aa2a047e3cb90d03" +
+            "57707ce3f4f5a7af8471eda5c0c0748454a9cbb48c25ebe4e7fd94e3881b6461" +
+            "d06e2bce128dc96decb537b8e9611591d445d7dfd3701d25ac05f8d091581aef"
+    )
+
     @Test
-    fun testMinimumFormat() {
-        assertEquals(MasterIndexFormat.ORIGINAL, decodedOriginal.minimumFormat)
-        assertEquals(MasterIndexFormat.VERSIONED, decodedVersioned.minimumFormat)
+    fun testCreateOriginal() {
+        val index = Store.open(ROOT.resolve("original")).use { store ->
+            Js5MasterIndex.create(store)
+        }
+
+        assertEquals(
+            Js5MasterIndex(
+                MasterIndexFormat.ORIGINAL,
+                mutableListOf(
+                    Js5MasterIndex.Entry(
+                        0, 609698396, ByteBufUtil.decodeHexDump(
+                            "0e1a2b93c80a41c7ad2a985dff707a6a8ff82e229cbc468f04191198920955a1" +
+                                "4b3d7eab77a17faf99208dee5b44afb789962ad79f230b3b59106a0af892219c"
+                        )
+                    ),
+                )
+            ), index
+        )
     }
 
     @Test
-    fun testCreate() {
-        val index = Store.open(ROOT).use { store ->
+    fun testCreateVersioned() {
+        val index = Store.open(ROOT.resolve("versioned")).use { store ->
             Js5MasterIndex.create(store)
         }
 
         assertEquals(
             Js5MasterIndex(
+                MasterIndexFormat.VERSIONED,
                 mutableListOf(
-                    Js5MasterIndex.Entry(0, 609698396),
-                    Js5MasterIndex.Entry(0x12345678, 78747481),
-                    Js5MasterIndex.Entry(0, 0),
-                    Js5MasterIndex.Entry(0x9ABCDEF0.toInt(), -456081154),
-                    Js5MasterIndex.Entry(0, 0),
-                    Js5MasterIndex.Entry(0, 0),
-                    Js5MasterIndex.Entry(0xAA55AA55.toInt(), 186613982)
+                    Js5MasterIndex.Entry(
+                        0, 609698396, ByteBufUtil.decodeHexDump(
+                            "0e1a2b93c80a41c7ad2a985dff707a6a8ff82e229cbc468f04191198920955a1" +
+                                "4b3d7eab77a17faf99208dee5b44afb789962ad79f230b3b59106a0af892219c"
+                        )
+                    ),
+                    Js5MasterIndex.Entry(
+                        0x12345678, 78747481, ByteBufUtil.decodeHexDump(
+                            "180ff4ad371f56d4a90d81e0b69b23836cd9b101b828f18b7e6d232c4d302539" +
+                                "638eb2e9259957645aae294f09b2d669c93dbbfc0d8359f1b232ae468f678ca1"
+                        )
+                    ),
+                    Js5MasterIndex.Entry(0, 0, null),
+                    Js5MasterIndex.Entry(
+                        0x9ABCDEF0.toInt(), -456081154, ByteBufUtil.decodeHexDump(
+                            "972003261b7628525346e0052567662e5695147ad710f877b63b9ab53b3f6650" +
+                                "ca003035fde4398b2ef73a60e4b13798aa597a30c1bf0a13c0cd412394af5f96"
+                        )
+                    ),
+                    Js5MasterIndex.Entry(0, 0, null),
+                    Js5MasterIndex.Entry(0, 0, null),
+                    Js5MasterIndex.Entry(
+                        0xAA55AA55.toInt(), 186613982, ByteBufUtil.decodeHexDump(
+                            "d50a6e9abd3b5269606304dc2769cbc8618e1ae6ff705291c0dfcc374e450dd2" +
+                                "5f1be5f1d5459651d22d3e87ef0a1c69be7807f661cd001be24a6609f6d57916"
+                        )
+                    )
+                )
+            ), index
+        )
+    }
+
+    @Test
+    fun testCreateWhirlpool() {
+        val index = Store.open(ROOT.resolve("whirlpool")).use { store ->
+            Js5MasterIndex.create(store)
+        }
+
+        assertEquals(
+            Js5MasterIndex(
+                MasterIndexFormat.WHIRLPOOL,
+                mutableListOf(
+                    Js5MasterIndex.Entry(
+                        0, 668177970, ByteBufUtil.decodeHexDump(
+                            "2faa83116e1d1719d5db15f128eb57f62afbf0207c47bced3f558ec17645d138" +
+                                "72f4fb9b0e36a5f6f5d30e1295b3fa49556dfd0819cb5137f3b69f64155f3fb7"
+                        )
+                    ),
+                    Js5MasterIndex.Entry(
+                        0, 1925442845, ByteBufUtil.decodeHexDump(
+                            "fcc45b0ab6d0067889e44de0004bcbb6cc538aff8f80edf1b49b583cedd73fea" +
+                                "937ae6990235257fe8aa35c44d35450c13e670711337ee5116957cd98cc27985"
+                        )
+                    )
                 )
             ), index
         )
@@ -73,7 +197,7 @@ object Js5MasterIndexTest {
     @Test
     fun testWriteOriginal() {
         ByteBufAllocator.DEFAULT.buffer().use { actual ->
-            decodedOriginal.write(actual, MasterIndexFormat.ORIGINAL)
+            decodedOriginal.write(actual)
 
             Unpooled.wrappedBuffer(encodedOriginal).use { expected ->
                 assertEquals(expected, actual)
@@ -98,11 +222,102 @@ object Js5MasterIndexTest {
     @Test
     fun testWriteVersioned() {
         ByteBufAllocator.DEFAULT.buffer().use { actual ->
-            decodedVersioned.write(actual, MasterIndexFormat.VERSIONED)
+            decodedVersioned.write(actual)
 
             Unpooled.wrappedBuffer(encodedVersioned).use { expected ->
                 assertEquals(expected, actual)
             }
         }
     }
+
+    @Test
+    fun testReadWhirlpool() {
+        Unpooled.wrappedBuffer(encodedWhirlpool).use { buf ->
+            val index = Js5MasterIndex.read(buf, MasterIndexFormat.WHIRLPOOL)
+            assertEquals(decodedWhirlpool, index)
+        }
+    }
+
+    @Test
+    fun testReadWhirlpoolInvalidSignature() {
+        Unpooled.copiedBuffer(encodedWhirlpool).use { buf ->
+            val lastIndex = buf.writerIndex() - 1
+            buf.setByte(lastIndex, buf.getByte(lastIndex).toInt().inv())
+
+            assertFailsWith<IllegalArgumentException> {
+                Js5MasterIndex.read(buf, MasterIndexFormat.WHIRLPOOL)
+            }
+        }
+    }
+
+    @Test
+    fun testReadWhirlpoolInvalidSignatureLength() {
+        Unpooled.wrappedBuffer(encodedWhirlpool, 0, encodedWhirlpool.size - 1).use { buf ->
+            assertFailsWith<IllegalArgumentException> {
+                Js5MasterIndex.read(buf, MasterIndexFormat.WHIRLPOOL)
+            }
+        }
+    }
+
+    @Test
+    fun testWriteWhirlpool() {
+        ByteBufAllocator.DEFAULT.buffer().use { actual ->
+            decodedWhirlpool.write(actual)
+
+            Unpooled.wrappedBuffer(encodedWhirlpool).use { expected ->
+                assertEquals(expected, actual)
+            }
+        }
+    }
+
+    @Test
+    fun testWriteWhirlpoolNullDigest() {
+        ByteBufAllocator.DEFAULT.buffer().use { actual ->
+            decodedWhirlpoolNullDigest.write(actual)
+
+            Unpooled.wrappedBuffer(encodedWhirlpoolNullDigest).use { expected ->
+                assertEquals(expected, actual)
+            }
+        }
+    }
+
+    @Test
+    fun testReadSigned() {
+        Unpooled.wrappedBuffer(encodedSigned).use { buf ->
+            val index = Js5MasterIndex.read(buf, MasterIndexFormat.WHIRLPOOL, PUBLIC_KEY)
+            assertEquals(decodedWhirlpool, index)
+        }
+    }
+
+    @Test
+    fun testReadSignedInvalidSignature() {
+        Unpooled.copiedBuffer(encodedSigned).use { buf ->
+            val lastIndex = buf.writerIndex() - 1
+            buf.setByte(lastIndex, buf.getByte(lastIndex).toInt().inv())
+
+            assertFailsWith<IllegalArgumentException> {
+                Js5MasterIndex.read(buf, MasterIndexFormat.WHIRLPOOL, PUBLIC_KEY)
+            }
+        }
+    }
+
+    @Test
+    fun testReadSignedInvalidSignatureLength() {
+        Unpooled.wrappedBuffer(encodedSigned, 0, encodedSigned.size - 1).use { buf ->
+            assertFailsWith<IllegalArgumentException> {
+                Js5MasterIndex.read(buf, MasterIndexFormat.WHIRLPOOL, PUBLIC_KEY)
+            }
+        }
+    }
+
+    @Test
+    fun testWriteSigned() {
+        ByteBufAllocator.DEFAULT.buffer().use { actual ->
+            decodedWhirlpool.write(actual, PRIVATE_KEY)
+
+            Unpooled.wrappedBuffer(encodedSigned).use { expected ->
+                assertEquals(expected, actual)
+            }
+        }
+    }
 }

cache/src/test/resources/org/openrs2/cache/master-index/private.key

@@ -0,0 +1,28 @@
+-----BEGIN PRIVATE KEY-----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+-----END PRIVATE KEY-----

cache/src/test/resources/org/openrs2/cache/master-index/public.key

@@ -0,0 +1,9 @@
+-----BEGIN PUBLIC KEY-----
+MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAxK6i16/Gh2XgM+Woy6bC
+AmgxrnuHzlp7QhfudkcLPLx8sZLjxrTFwHVwgxa9CwmDxspHKrBzKhdv/ijbT4p3
+UaUOrKSRA2xoS0Tko+z8m3PANpYr0txhuS22Y025MyKqVGHEe6eFa28RDiDeWOwf
+b8zKah4XDAn5M5/ZOkcqc8DGAqjWVDSVSaLSUwC0oOIBthhJmXqslMu6CXBXsPi+
+sZ6xLGeNUtKLlqBNMAlrsYpCXjA+nhWUTY0TLfJleDQdvMtojVLiWyPmISoOpCOW
+35ZxdeLFGP8q/fenKF1hHOoc8gox1N9CLZrQ+n/VuPKV5u6t44SoQb3bME/KHy0v
+SQIDAQAB
+-----END PUBLIC KEY-----