add blake2 function

Blockchain/Package.resolved

@@ -10,6 +10,15 @@
         "revision" : "679ee7d35e493e181be844dadbe78636cefaace4"
       }
     },
+    {
+      "identity" : "blake2.swift",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/tesseract-one/Blake2.swift.git",
+      "state" : {
+        "revision" : "29c55c8fe42d6661e5a32cc5bbbad1fff64fd01e",
+        "version" : "0.2.0"
+      }
+    },
     {
       "identity" : "scalecodec.swift",
       "kind" : "remoteSourceControl",

Boka/Package.resolved

@@ -10,6 +10,15 @@
         "revision" : "679ee7d35e493e181be844dadbe78636cefaace4"
       }
     },
+    {
+      "identity" : "blake2.swift",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/tesseract-one/Blake2.swift.git",
+      "state" : {
+        "revision" : "29c55c8fe42d6661e5a32cc5bbbad1fff64fd01e",
+        "version" : "0.2.0"
+      }
+    },
     {
       "identity" : "scalecodec.swift",
       "kind" : "remoteSourceControl",

Node/Package.resolved

@@ -10,6 +10,15 @@
         "revision" : "679ee7d35e493e181be844dadbe78636cefaace4"
       }
     },
+    {
+      "identity" : "blake2.swift",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/tesseract-one/Blake2.swift.git",
+      "state" : {
+        "revision" : "29c55c8fe42d6661e5a32cc5bbbad1fff64fd01e",
+        "version" : "0.2.0"
+      }
+    },
     {
       "identity" : "scalecodec.swift",
       "kind" : "remoteSourceControl",

Utils/Package.resolved

@@ -1,6 +1,15 @@
 {
-  "originHash" : "20e3a243ff55bca06efe38725567e64612fcf69c4836f7018fbfb322bcf6d466",
+  "originHash" : "7f9d01d4c8c5ccb64f9b9f466f7f8e61b0fd8cd435aa5c4e587e5a6e459f5d77",
   "pins" : [
+    {
+      "identity" : "blake2.swift",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/tesseract-one/Blake2.swift.git",
+      "state" : {
+        "revision" : "29c55c8fe42d6661e5a32cc5bbbad1fff64fd01e",
+        "version" : "0.2.0"
+      }
+    },
     {
       "identity" : "scalecodec.swift",
       "kind" : "remoteSourceControl",

Utils/Package.swift

@@ -17,6 +17,7 @@ let package = Package(
     ],
     dependencies: [
         .package(url: "https://github.com/tesseract-one/ScaleCodec.swift.git", from: "0.3.0"),
+        .package(url: "https://github.com/tesseract-one/Blake2.swift.git", from: "0.2.0"),
         .package(url: "https://github.com/apple/swift-crypto.git", "1.0.0" ..< "4.0.0"),
     ],
     targets: [
@@ -26,6 +27,7 @@ let package = Package(
             name: "Utils",
             dependencies: [
                 .product(name: "ScaleCodec", package: "ScaleCodec.swift"),
+                .product(name: "Blake2", package: "Blake2.swift"),
                 .product(name: "Crypto", package: "swift-crypto"),
             ]
         ),

Utils/Sources/Utils/Extensions.swift

@@ -0,0 +1,25 @@
+import Foundation
+
+extension Data {
+    init?(fromHexString hexString: String) {
+        guard !hexString.isEmpty else {
+            return nil
+        }
+
+        var data = Data()
+        var index = hexString.startIndex
+
+        while index < hexString.endIndex {
+            guard let nextIndex = hexString.index(index, offsetBy: 2, limitedBy: hexString.endIndex),
+                  let byte = UInt8(hexString[index ..< nextIndex], radix: 16)
+            else {
+                return nil
+            }
+
+            data.append(byte)
+            index = nextIndex
+        }
+
+        self.init(data)
+    }
+}

Utils/Sources/Utils/hashing.swift

@@ -0,0 +1,13 @@
+import Blake2
+import Foundation
+
+/// Computes a Blake2b 256-bit hash of the input data and returns the result as a `Data32`.
+///
+/// - Parameter: The input data to hash.
+/// - Throws: An error if the hashing process fails.
+/// - Returns: A `Data32` containing the hash result.
+public func blake2b256(_ data: Data) throws -> Data32 {
+    let hash = try Blake2b.hash(size: 32, data: data)
+    let data32 = Data32(hash)!
+    return data32
+}

Utils/Tests/UtilsTests/Blake2Tests.swift

@@ -0,0 +1,12 @@
+import XCTest
+
+@testable import Utils
+
+final class Blake2Tests: XCTestCase {
+    func testBlake2b256Test() throws {
+        let testData = Data("test".utf8)
+        let expected = Data(fromHexString: "928b20366943e2afd11ebc0eae2e53a93bf177a4fcf35bcc64d503704e65e202")
+        let actual = try blake2b256(testData)
+        XCTAssertEqual(expected, actual.data)
+    }
+}