secure-random-js: upgrade sigmajsCryptoFacadeVersion = "0.0.7" and im…

…plement SecureRandom for js Platform
ergoplatform · Aug 1, 2023 · b4a65a1 · b4a65a1
1 parent 1c7b9dc
commit b4a65a1
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Showing 4 changed files with 25 additions and 5 deletions.
diff --git a/build.sbt b/build.sbt
@@ -186,7 +186,7 @@ lazy val commonDependenies2 = libraryDependencies ++= Seq(
   "org.scala-lang.modules" %%% "scala-collection-compat" % "2.7.0"
 )
 
-val sigmajsCryptoFacadeVersion = "0.0.6"
+val sigmajsCryptoFacadeVersion = "0.0.7"
 
 lazy val common = crossProject(JVMPlatform, JSPlatform)
   .in(file("common"))

diff --git a/interpreter/js/src/main/scala/sigmastate/crypto/Platform.scala b/interpreter/js/src/main/scala/sigmastate/crypto/Platform.scala
@@ -120,7 +120,7 @@ object Platform {
   class Curve
 
   // TODO JS: Use JS library for secure source of randomness
-  type SecureRandom = Random
+  type SecureRandom = sigmastate.crypto.SecureRandomJS
 
   /** Opaque point type. */
   @js.native
@@ -198,7 +198,7 @@ object Platform {
   }
 
   /** Create JS specific source of secure randomness. */
-  def createSecureRandom(): Random = new Random()
+  def createSecureRandom(): SecureRandom = new SecureRandomJS
 
   /** Computes HMAC-SHA512 hash of the given data using the specified key.
     *

diff --git a/interpreter/js/src/main/scala/sigmastate/crypto/SigmaJsCryptoFacade.scala b/interpreter/js/src/main/scala/sigmastate/crypto/SigmaJsCryptoFacade.scala
@@ -1,5 +1,7 @@
 package sigmastate.crypto
 
+import debox.cfor
+
 import scala.scalajs.js
 import scala.scalajs.js.annotation.JSImport
 import scala.scalajs.js.typedarray.Uint8Array
@@ -109,6 +111,24 @@ object CryptoFacadeJs extends js.Object {
   def generatePbkdf2Key(
       normalizedMnemonic: String,
       normalizedPass: String): Uint8Array = js.native
+
+  /** Creates a random array of bytes of the given length. */
+  def getRandomBytes(length: Int): Uint8Array = js.native
+}
+
+class SecureRandomJS {
+  /**
+    * Generates a user-specified number of random bytes.
+    *
+    * @param bytes the array to be filled in with random bytes.
+    */
+  def nextBytes(bytes: Array[Byte]): Unit = {
+    val len = bytes.length
+    val arr = CryptoFacadeJs.getRandomBytes(len)
+    cfor(0)(_ < len, _ + 1) { i =>
+      bytes(i) = arr(i).toByte
+    }
+  }
 }
 
 /** Represents imported Point class from `sigmajs-crypto-facade` JS libarary. */

diff --git a/sc/shared/src/test/scala/sigmastate/utxo/examples/OracleExamplesSpecification.scala b/sc/shared/src/test/scala/sigmastate/utxo/examples/OracleExamplesSpecification.scala
@@ -15,7 +15,7 @@ import sigmastate.helpers.TestingHelpers._
 import org.ergoplatform._
 import org.ergoplatform.dsl.{ContractSpec, SigmaContractSyntax, StdContracts, TestContractSpec}
 import sigmastate.basics.CryptoConstants
-import sigmastate.crypto.CryptoFacade
+import sigmastate.crypto.{BigIntegers, CryptoFacade}
 import sigmastate.eval.Extensions.ArrayOps
 import sigmastate.interpreter.Interpreter.{ScriptNameProp, emptyEnv}
 import sigmastate.utxo._
@@ -89,7 +89,7 @@ class OracleExamplesSpecification extends CompilerTestingCommons
 
     val temperature: Long = 18
 
-    val r = BigInt.apply(128, CryptoFacade.createSecureRandom()) //128 bits random number
+    val r = BigInt(BigIntegers.createRandomBigInteger(128, CryptoFacade.createSecureRandom())) //128 bits random number
     val a = group.exponentiate(group.generator, r.bigInteger)
 
     val ts = System.currentTimeMillis()