From 59c18f6b233a8893eab70fc0f25df74a25e6d92b Mon Sep 17 00:00:00 2001
From: KotlinGeekDev <kotlingeek@protonmail.com>
Date: Fri, 26 Dec 2025 15:27:50 +0100
Subject: [PATCH] Foundations(iOS Sourceset): Implement secp256k1 instance
 functions. Small fixes in TestResourceLoader.

---
 .../quartz/utils/Secp256k1Instance.ios.kt     | 30 ++++++++-----------
 .../quartz/TestResourceLoader.kt              |  4 +--
 2 files changed, 15 insertions(+), 19 deletions(-)

diff --git a/quartz/src/iosMain/kotlin/com/vitorpamplona/quartz/utils/Secp256k1Instance.ios.kt b/quartz/src/iosMain/kotlin/com/vitorpamplona/quartz/utils/Secp256k1Instance.ios.kt
index c08d8edef..d098cac0f 100644
--- a/quartz/src/iosMain/kotlin/com/vitorpamplona/quartz/utils/Secp256k1Instance.ios.kt
+++ b/quartz/src/iosMain/kotlin/com/vitorpamplona/quartz/utils/Secp256k1Instance.ios.kt
@@ -20,49 +20,45 @@
  */
 package com.vitorpamplona.quartz.utils
 
+import fr.acinq.secp256k1.Secp256k1
+
 actual object Secp256k1Instance {
+
+    private val h02 = Hex.decode("02")
+    private val secp256k1Ref = Secp256k1.get()
+
     actual fun compressedPubKeyFor(privKey: ByteArray): ByteArray {
-        TODO("Not yet implemented")
+        return secp256k1Ref.pubKeyCompress(secp256k1Ref.pubkeyCreate(privKey))
     }
 
     actual fun isPrivateKeyValid(il: ByteArray): Boolean {
-        TODO("Not yet implemented")
+        return secp256k1Ref.secKeyVerify(il)
     }
 
     actual fun signSchnorr(
         data: ByteArray,
         privKey: ByteArray,
         nonce: ByteArray?,
-    ): ByteArray {
-        TODO("Not yet implemented")
-    }
+    ): ByteArray = secp256k1Ref.signSchnorr(data, privKey, nonce)
 
     actual fun signSchnorr(
         data: ByteArray,
         privKey: ByteArray,
-    ): ByteArray {
-        TODO("Not yet implemented")
-    }
+    ): ByteArray = secp256k1Ref.signSchnorr(data, privKey, null)
 
     actual fun verifySchnorr(
         signature: ByteArray,
         hash: ByteArray,
         pubKey: ByteArray,
-    ): Boolean {
-        TODO("Not yet implemented")
-    }
+    ): Boolean = secp256k1Ref.verifySchnorr(signature, hash, pubKey)
 
     actual fun privateKeyAdd(
         first: ByteArray,
         second: ByteArray,
-    ): ByteArray {
-        TODO("Not yet implemented")
-    }
+    ): ByteArray = secp256k1Ref.privKeyTweakAdd(first, second)
 
     actual fun pubKeyTweakMulCompact(
         pubKey: ByteArray,
         privateKey: ByteArray,
-    ): ByteArray {
-        TODO("Not yet implemented")
-    }
+    ): ByteArray = secp256k1Ref.pubKeyTweakMul(h02 + pubKey, privateKey).copyOfRange(1, 33)
 }
diff --git a/quartz/src/iosTest/kotlin/com/vitorpamplona/quartz/TestResourceLoader.kt b/quartz/src/iosTest/kotlin/com/vitorpamplona/quartz/TestResourceLoader.kt
index e9ff8dd5b..029347f73 100644
--- a/quartz/src/iosTest/kotlin/com/vitorpamplona/quartz/TestResourceLoader.kt
+++ b/quartz/src/iosTest/kotlin/com/vitorpamplona/quartz/TestResourceLoader.kt
@@ -32,11 +32,11 @@ import platform.darwin.NSObjectMeta
 actual class TestResourceLoader {
     @OptIn(ExperimentalForeignApi::class, BetaInteropApi::class)
     actual fun loadString(file: String): String {
-        val bundle = NSBundle.Companion.bundleForClass(BundleMarker)
+        val bundle = NSBundle.bundleForClass(BundleMarker)
         val path =
             bundle.pathForResource(file, ofType = null)
                 ?: throw IllegalArgumentException("Resource not found: $file")
-        return NSString.Companion.stringWithContentsOfFile(path, encoding = NSUTF8StringEncoding, error = null)!!
+        return NSString.stringWithContentsOfFile(path, encoding = NSUTF8StringEncoding, error = null)!!
     }
 
     private class BundleMarker : NSObject() {