Make PubKey, SecKey, and SecKeyGenerator multiplatform - Resolves #61

gradle/libs.versions.toml

@@ -12,6 +12,7 @@ mavenPublishGradlePlugin = "0.25.3"
 moshi = "1.15.0"
 okHttp = "5.0.0-alpha.11"
 okIo = "3.4.0"
+secureRandom = "0.3.1"
 slf4j = "2.0.7"
 versionCatalogUpdateGradlePlugin = "0.8.1"
 versionsGradlePlugin = "0.47.0"
@@ -32,6 +33,7 @@ kotlinxCoroutines = { module = "org.jetbrains.kotlinx:kotlinx-coroutines-core",
 moshi = { module = "com.squareup.moshi:moshi-kotlin", version.ref = "moshi" }
 okHttp = { module = "com.squareup.okhttp3:okhttp", version.ref = "okHttp" }
 okIo = { module = "com.squareup.okio:okio", version.ref = "okIo" }
+secureRandom = { module = "org.kotlincrypto:secure-random", version.ref = "secureRandom" }
 slf4jSimple = { module = "org.slf4j:slf4j-simple", version.ref = "slf4j" }
 turbine = "app.cash.turbine:turbine:1.0.0"
 kotlin-test = { module = "org.jetbrains.kotlin:kotlin-test", version.ref = "kotlin" }

lib/api/lib.api

@@ -169,7 +169,6 @@ public final class app/cash/nostrino/crypto/SecKey : app/cash/nostrino/crypto/Ke
 	public final fun copy (Lokio/ByteString;)Lapp/cash/nostrino/crypto/SecKey;
 	public static synthetic fun copy$default (Lapp/cash/nostrino/crypto/SecKey;Lokio/ByteString;ILjava/lang/Object;)Lapp/cash/nostrino/crypto/SecKey;
 	public fun encoded ()Ljava/lang/String;
-	public final fun encrypt (Lapp/cash/nostrino/crypto/PubKey;Ljava/lang/String;)Lapp/cash/nostrino/crypto/CipherText;
 	public fun equals (Ljava/lang/Object;)Z
 	public final fun getKey ()Lokio/ByteString;
 	public final fun getNsec ()Ljava/lang/String;
@@ -359,6 +358,10 @@ public final class app/cash/nostrino/model/EncryptedDm : app/cash/nostrino/model
 public final class app/cash/nostrino/model/EncryptedDm$Companion {
 }
 
+public final class app/cash/nostrino/model/EncryptedDmKt {
+	public static final fun encrypt (Lapp/cash/nostrino/crypto/SecKey;Lapp/cash/nostrino/crypto/PubKey;Ljava/lang/String;)Lapp/cash/nostrino/crypto/CipherText;
+}
+
 public final class app/cash/nostrino/model/Event {
 	public static final field Companion Lapp/cash/nostrino/model/Event$Companion;
 	public fun <init> (Lokio/ByteString;Lokio/ByteString;Ljava/time/Instant;ILjava/util/List;Ljava/lang/String;Lokio/ByteString;)V

lib/build.gradle.kts

@@ -22,6 +22,7 @@ kotlin {
         implementation(libs.acinqSecp256k1)
         implementation(libs.kotlinxCoroutines)
         implementation(libs.okIo)
+        implementation(libs.secureRandom)
       }
     }
 

lib/src/jvmMain/kotlin/app/cash/nostrino/crypto/SecKey.kt → lib/src/commonMain/kotlin/app/cash/nostrino/crypto/SecKey.kt

@@ -21,10 +21,6 @@ import fr.acinq.secp256k1.Hex
 import fr.acinq.secp256k1.Secp256k1
 import okio.ByteString
 import okio.ByteString.Companion.toByteString
-import java.security.SecureRandom
-import javax.crypto.Cipher
-import javax.crypto.spec.IvParameterSpec
-import javax.crypto.spec.SecretKeySpec
 
 /**
  * Nostr secret key.
@@ -58,15 +54,7 @@ data class SecKey(val key: ByteString) : Key {
     ).copyOfRange(1, 33)
 
   /** Generate cipher text of the provided plain text, intended for the provided pub key */
-  fun encrypt(to: PubKey, plainText: String): CipherText {
-    val random = SecureRandom()
-    val iv = ByteArray(16)
-    random.nextBytes(iv)
-    val cipher = Cipher.getInstance("AES/CBC/PKCS5Padding")
-    cipher.init(Cipher.ENCRYPT_MODE, SecretKeySpec(sharedSecretWith(to), "AES"), IvParameterSpec(iv))
-    val encrypted = cipher.doFinal(plainText.toByteArray())
-    return CipherText(encrypted.toByteString(), iv.toByteString())
-  }
+
 
   companion object {
     /** Create secret key from nip-19 bech32 encoded string */

lib/src/jvmMain/kotlin/app/cash/nostrino/crypto/SecKeyGenerator.kt → lib/src/commonMain/kotlin/app/cash/nostrino/crypto/SecKeyGenerator.kt

@@ -18,14 +18,14 @@
 package app.cash.nostrino.crypto
 
 import okio.ByteString.Companion.toByteString
-import java.security.SecureRandom
+import org.kotlincrypto.SecureRandom
 
 class SecKeyGenerator {
 
   /** Generate a new secret key */
   tailrec fun generate(): SecKey {
     val bs = ByteArray(32)
-    SecureRandom().nextBytes(bs)
+    SecureRandom().nextBytesCopyTo(bs)
     val sec = bs.toByteString()
     return if (sec.hex() > MAX_SEC) generate() else SecKey(sec)
   }

lib/src/jvmMain/kotlin/app/cash/nostrino/model/EncryptedDm.kt

@@ -19,6 +19,11 @@ package app.cash.nostrino.model
 import app.cash.nostrino.crypto.CipherText
 import app.cash.nostrino.crypto.PubKey
 import app.cash.nostrino.crypto.SecKey
+import okio.ByteString.Companion.toByteString
+import java.security.SecureRandom
+import javax.crypto.Cipher
+import javax.crypto.spec.IvParameterSpec
+import javax.crypto.spec.SecretKeySpec
 
 /**
  * An encrypted direct message. Event kind 4, as defined in
@@ -43,3 +48,13 @@ data class EncryptedDm(
     const val kind = 4
   }
 }
+
+fun SecKey.encrypt(to: PubKey, plainText: String): CipherText {
+  val random = SecureRandom()
+  val iv = ByteArray(16)
+  random.nextBytes(iv)
+  val cipher = Cipher.getInstance("AES/CBC/PKCS5Padding")
+  cipher.init(Cipher.ENCRYPT_MODE, SecretKeySpec(sharedSecretWith(to), "AES"), IvParameterSpec(iv))
+  val encrypted = cipher.doFinal(plainText.toByteArray())
+  return CipherText(encrypted.toByteString(), iv.toByteString())
+}