Testing that both 02 and 03 compressed keys are valid Nostr keys and can encrypt and decrypt to each other.

quartz/src/androidTest/java/com/vitorpamplona/quartz/crypto/nip01/Nip01Test.kt

@@ -44,6 +44,24 @@ class Nip01Test {
         )
     }
 
+    @Test
+    fun testGetPublicCompressedWith2() {
+        val key = "e6159851715b4aa6190c22b899b0c792847de0a4435ac5b678f35738351c43b0".hexToByteArray()
+        assertEquals(
+            "029fa4ce8c87ca546b196e6518db80a6780e1bd5552b61f9f17bafee5d4e34e09b",
+            nip01.compressedPubkeyCreate(key).toHexKey(),
+        )
+    }
+
+    @Test
+    fun testGetPublicCompressedWith3() {
+        val key = "65f039136f8da8d3e87b4818746b53318d5481e24b2673f162815144223a0b5a".hexToByteArray()
+        assertEquals(
+            "033dcef7585efbdb68747d919152bd481e21f5e952aaaef5a19604fbd096a93dd5",
+            nip01.compressedPubkeyCreate(key).toHexKey(),
+        )
+    }
+
     @Test
     fun testDeterministicSign() {
         assertEquals(

quartz/src/androidTest/java/com/vitorpamplona/quartz/crypto/nip44/NIP44v2Test.kt

@@ -25,6 +25,7 @@ import androidx.test.platform.app.InstrumentationRegistry.getInstrumentation
 import com.fasterxml.jackson.annotation.JsonProperty
 import com.fasterxml.jackson.module.kotlin.jacksonObjectMapper
 import com.vitorpamplona.quartz.crypto.KeyPair
+import com.vitorpamplona.quartz.crypto.nip01.Nip01
 import com.vitorpamplona.quartz.encoders.hexToByteArray
 import com.vitorpamplona.quartz.encoders.toHexKey
 import fr.acinq.secp256k1.Secp256k1
@@ -48,6 +49,7 @@ class NIP44v2Test {
 
     private val random = SecureRandom()
     private val nip44v2 = Nip44v2(Secp256k1.get(), random)
+    private val nip01 = Nip01(Secp256k1.get(), random)
 
     @Test
     fun conversationKeyTest() {
@@ -67,6 +69,34 @@ class NIP44v2Test {
         }
     }
 
+    @Test
+    fun testCompressedWith02Keys() {
+        val privateKeyA = "f410f88bcec6cbfda04d6a273c7b1dd8bba144cd45b71e87109cfa11dd7ed561".hexToByteArray()
+        val privateKeyB = "65f039136f8da8d3e87b4818746b53318d5481e24b2673f162815144223a0b5a".hexToByteArray()
+
+        val publicKeyA = nip01.pubkeyCreate(privateKeyA)
+        val publicKeyB = nip01.pubkeyCreate(privateKeyB)
+
+        assertEquals(
+            nip44v2.getConversationKey(privateKeyA, publicKeyB).toHexKey(),
+            nip44v2.getConversationKey(privateKeyB, publicKeyA).toHexKey(),
+        )
+    }
+
+    @Test
+    fun testCompressedWith03Keys() {
+        val privateKeyA = "f410f88bcec6cbfda04d6a273c7b1dd8bba144cd45b71e87109cfa11dd7ed561".hexToByteArray()
+        val privateKeyB = "e6159851715b4aa6190c22b899b0c792847de0a4435ac5b678f35738351c43b0".hexToByteArray()
+
+        val publicKeyA = nip01.pubkeyCreate(privateKeyA)
+        val publicKeyB = nip01.pubkeyCreate(privateKeyB)
+
+        assertEquals(
+            nip44v2.getConversationKey(privateKeyA, publicKeyB).toHexKey(),
+            nip44v2.getConversationKey(privateKeyB, publicKeyA).toHexKey(),
+        )
+    }
+
     @Test
     fun encryptDecryptTest() {
         for (v in vectors.v2?.valid?.encryptDecrypt!!) {

quartz/src/main/java/com/vitorpamplona/quartz/crypto/nip01/Nip01.kt

@@ -33,7 +33,9 @@ class Nip01(
     /** Provides a 32B "private key" aka random number */
     fun privkeyCreate() = random(32)
 
-    fun pubkeyCreate(privKey: ByteArray) = secp256k1.pubKeyCompress(secp256k1.pubkeyCreate(privKey)).copyOfRange(1, 33)
+    fun compressedPubkeyCreate(privKey: ByteArray) = secp256k1.pubKeyCompress(secp256k1.pubkeyCreate(privKey))
+
+    fun pubkeyCreate(privKey: ByteArray) = compressedPubkeyCreate(privKey).copyOfRange(1, 33)
 
     fun sign(
         data: ByteArray,