add ed25519 functions

Blockchain/Package.resolved

@@ -1,5 +1,5 @@
 {
-  "originHash" : "70e836bce6a34055534368d9795a06e92002ca028f0fcd154b1d037502f7060c",
+  "originHash" : "0ac92ee4aeacbb08a4c124d75df94d0eef8e04bbc2ecc74287b02650ec69779a",
   "pins" : [
     {
       "identity" : "async-channels",
@@ -37,6 +37,15 @@
         "version" : "1.1.0"
       }
     },
+    {
+      "identity" : "swift-crypto",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/apple/swift-crypto.git",
+      "state" : {
+        "revision" : "bc1c29221f6dfeb0ebbfbc98eb95cd3d4967868e",
+        "version" : "3.4.0"
+      }
+    },
     {
       "identity" : "tuples.swift",
       "kind" : "remoteSourceControl",

Boka/Package.resolved

@@ -1,5 +1,5 @@
 {
-  "originHash" : "bd44440d7f85d30386716bbd2cc933f21b5ebbc0e75fbfc91dc6a138b6c8ce43",
+  "originHash" : "a4042fe50ef710cddb88ce0dedba5a852492f62faeacb51990391e81ddcf7e06",
   "pins" : [
     {
       "identity" : "async-channels",
@@ -46,6 +46,15 @@
         "version" : "1.1.1"
       }
     },
+    {
+      "identity" : "swift-crypto",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/apple/swift-crypto.git",
+      "state" : {
+        "revision" : "bc1c29221f6dfeb0ebbfbc98eb95cd3d4967868e",
+        "version" : "3.4.0"
+      }
+    },
     {
       "identity" : "tuples.swift",
       "kind" : "remoteSourceControl",

Node/Package.resolved

@@ -1,5 +1,5 @@
 {
-  "originHash" : "82a6d0499b5b0467ed0f8512e428444b3e8626df0667aaa6217ac2055f9ae08c",
+  "originHash" : "9410affb9296c71e9328e458fd6424e870da866b122c00a7925ca2247508a8e9",
   "pins" : [
     {
       "identity" : "async-channels",
@@ -37,6 +37,15 @@
         "version" : "1.1.0"
       }
     },
+    {
+      "identity" : "swift-crypto",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/apple/swift-crypto.git",
+      "state" : {
+        "revision" : "bc1c29221f6dfeb0ebbfbc98eb95cd3d4967868e",
+        "version" : "3.4.0"
+      }
+    },
     {
       "identity" : "tuples.swift",
       "kind" : "remoteSourceControl",

Utils/Package.resolved

@@ -1,5 +1,5 @@
 {
-  "originHash" : "7e6e33157836e05375f90c70184331ac5884a4dc78788ca4ae9e201bcdf8dfed",
+  "originHash" : "20e3a243ff55bca06efe38725567e64612fcf69c4836f7018fbfb322bcf6d466",
   "pins" : [
     {
       "identity" : "scalecodec.swift",
@@ -10,6 +10,15 @@
         "version" : "0.3.1"
       }
     },
+    {
+      "identity" : "swift-crypto",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/apple/swift-crypto.git",
+      "state" : {
+        "revision" : "bc1c29221f6dfeb0ebbfbc98eb95cd3d4967868e",
+        "version" : "3.4.0"
+      }
+    },
     {
       "identity" : "tuples.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/apple/swift-crypto.git", "1.0.0" ..< "4.0.0"),
     ],
     targets: [
         // Targets are the basic building blocks of a package, defining a module or a test suite.
@@ -25,6 +26,7 @@ let package = Package(
             name: "Utils",
             dependencies: [
                 .product(name: "ScaleCodec", package: "ScaleCodec.swift"),
+                .product(name: "Crypto", package: "swift-crypto"),
             ]
         ),
         .testTarget(

Utils/Sources/Utils/Ed25519.swift

@@ -0,0 +1,37 @@
+import Crypto
+import Foundation
+
+public struct Ed25519 {
+    public let secretKey: Curve25519.Signing.PrivateKey
+
+    public var publicKey: Data32 {
+        Data32(secretKey.publicKey.rawRepresentation)!
+    }
+
+    public var privateKey: Data32 {
+        Data32(secretKey.rawRepresentation)!
+    }
+
+    public init() {
+        secretKey = Curve25519.Signing.PrivateKey()
+    }
+
+    public init?(privateKey: Data32) {
+        guard let key = try? Curve25519.Signing.PrivateKey(rawRepresentation: privateKey.data) else {
+            return nil
+        }
+        secretKey = key
+    }
+
+    public func sign(message: Data) throws -> Data64 {
+        let signature = try secretKey.signature(for: message)
+        return Data64(signature)!
+    }
+
+    public func verify(signature: Data64, message: Data, publicKey: Data32) -> Bool {
+        guard let publicKey = try? Curve25519.Signing.PublicKey(rawRepresentation: publicKey.data) else {
+            return false
+        }
+        return publicKey.isValidSignature(signature.data, for: message)
+    }
+}

Utils/Tests/UtilsTests/Ed25519Tests.swift

@@ -0,0 +1,21 @@
+import XCTest
+
+@testable import Utils
+
+final class Ed25519Tests: XCTestCase {
+    func testEd25519Signature() throws {
+        let ed25519 = Ed25519()
+        let publicKey = ed25519.publicKey
+
+        let message = Data("test".utf8)
+        let signature = try ed25519.sign(message: message)
+        XCTAssertTrue(ed25519.verify(signature: signature, message: message, publicKey: publicKey))
+
+        let invalidMessage = Data("tests".utf8)
+        XCTAssertFalse(ed25519.verify(signature: signature, message: invalidMessage, publicKey: publicKey))
+
+        var invalidSignature = signature.data
+        invalidSignature.replaceSubrange(0 ... 1, with: [10, 12])
+        XCTAssertFalse(ed25519.verify(signature: Data64(invalidSignature)!, message: message, publicKey: publicKey))
+    }
+}