add nsdata utility functions

solana-kotlin/src/commonMain/kotlin/net/avianlabs/solana/domain/core/Transaction.kt

@@ -53,7 +53,7 @@ public class Transaction(
     val signaturesSize = signatures.size
     val signaturesLength = ShortvecEncoding.encodeLength(signaturesSize)
     val bufferSize =
-      signaturesLength.size + signaturesSize * SIGNATURE_LENGTH + serializedMessage.size
+      signaturesLength.size + signaturesSize * TweetNaCl.Signature.SIGNATURE_BYTES + serializedMessage.size
     val out = Buffer()
     out.write(signaturesLength)
     for (signature in signatures) {
@@ -72,5 +72,3 @@ public class Transaction(
   }
 
 }
-
-private const val SIGNATURE_LENGTH = 64

solana-kotlin/src/iosMain/kotlin/net/avianlabs/solana/domain/core/Transaction.ios.kt

@@ -0,0 +1,7 @@
+package net.avianlabs.solana.domain.core
+
+import kotlinx.cinterop.*
+import net.avianlabs.solana.tweetnacl.ed25519.toNSData
+import platform.Foundation.NSData
+
+public fun Transaction.serializeData(): NSData = serialize().toNSData()

tweetnacl-multiplatform/build.gradle.kts

@@ -76,7 +76,7 @@ kotlin {
       val main by compilations.getting
 
       main.cinterops {
-        create("tweetnacl") {
+        create("TweetNaCl") {
           header(file("vendor/tweetnacl/tweetnacl.h"))
           packageName("net.avianlabs.solana.tweetnacl")
         }

tweetnacl-multiplatform/src/commonMain/kotlin/net/avianlabs/solana/tweetnacl/TweetNaCl.kt

@@ -34,6 +34,7 @@ public interface TweetNaCl {
     public companion object : Signature {
       public const val SECRET_KEY_BYTES: Int = 64
       public const val PUBLIC_KEY_BYTES: Int = 32
+      public const val SIGNATURE_BYTES: Int = 64
 
       override fun sign(message: ByteArray, secretKey: ByteArray): ByteArray =
         signInternal(message, secretKey)

tweetnacl-multiplatform/src/iosMain/kotlin/net/avianlabs/solana/tweetnacl/ed25519/NSData.ios.kt

@@ -0,0 +1,28 @@
+@file:OptIn(
+  ExperimentalForeignApi::class,
+  BetaInteropApi::class,
+)
+
+package net.avianlabs.solana.tweetnacl.ed25519
+
+import kotlinx.cinterop.*
+import platform.Foundation.NSData
+import platform.Foundation.create
+import platform.posix.memcpy
+
+public fun NSData.toKotlinByteArray(): ByteArray = ByteArray(length.toInt()).apply {
+  usePinned { pinned: Pinned<ByteArray> ->
+    memcpy(
+      __dst = pinned.addressOf(0),
+      __src = this@toKotlinByteArray.bytes,
+      __n = this@toKotlinByteArray.length,
+    )
+  }
+}
+
+public fun ByteArray.toNSData(): NSData = memScoped {
+  NSData.create(
+    bytes = allocArrayOf(this@toNSData),
+    length = size.toULong(),
+  )
+}

tweetnacl-multiplatform/src/iosMain/kotlin/net/avianlabs/solana/tweetnacl/ed25519/PublicKey.ios.kt

@@ -1,31 +1,11 @@
-@file:OptIn(
-  ExperimentalForeignApi::class,
-  BetaInteropApi::class,
-)
-
 package net.avianlabs.solana.tweetnacl.ed25519
 
 import kotlinx.cinterop.*
 import platform.Foundation.NSData
-import platform.Foundation.create
-import platform.posix.memcpy
 
 public fun PublicKey(data: NSData): PublicKey = PublicKey(
-  bytes = ByteArray(data.length.toInt()).apply {
-    usePinned { pinned ->
-      memcpy(
-        __dst = pinned.addressOf(0),
-        __src = data.bytes,
-        __n = data.length,
-      )
-    }
-  }
+  bytes = data.toKotlinByteArray(),
 )
 
 public val PublicKey.data: NSData
-  get() = memScoped {
-    NSData.create(
-      bytes = allocArrayOf(bytes),
-      length = bytes.size.toULong(),
-    )
-  }
+  get() = bytes.toNSData()