Signature verification (#437)

* update package

* bump the version

* get on the latest version and write a test

Package.swift

@@ -20,7 +20,7 @@ let package = Package(
 		.package(url: "https://github.com/tesseract-one/CSecp256k1.swift.git", from: "0.2.0"),
 		.package(url: "https://github.com/bufbuild/connect-swift", exact: "1.0.0"),
 		.package(url: "https://github.com/apple/swift-docc-plugin.git", from: "1.4.3"),
-		.package(url: "https://github.com/xmtp/libxmtp-swift.git", exact: "3.0.3"),
+		.package(url: "https://github.com/xmtp/libxmtp-swift.git", exact: "3.0.5"),
 		.package(url: "https://github.com/krzyzanowskim/CryptoSwift.git", exact: "1.8.3")
 	],
 	targets: [

Sources/XMTPiOS/Client.swift

@@ -379,6 +379,30 @@ public final class Client {
 		return try ffiClient.signWithInstallationKey(text: message)
 	}
 
+	public func verifySignature(message: String, signature: Data) throws -> Bool
+	{
+		do {
+			try ffiClient.verifySignedWithInstallationKey(
+				signatureText: message, signatureBytes: signature)
+			return true
+		} catch {
+			return false
+		}
+	}
+
+	public func verifySignatureWithInstallationId(
+		message: String, signature: Data, installationId: String
+	) throws -> Bool {
+		do {
+			try ffiClient.verifySignedWithPublicKey(
+				signatureText: message, signatureBytes: signature,
+				publicKey: installationId.hexToData)
+			return true
+		} catch {
+			return false
+		}
+	}
+
 	public func findGroup(groupId: String) throws -> Group? {
 		do {
 			return Group(

Tests/XMTPTests/ClientTests.swift

@@ -398,4 +398,71 @@ class ClientTests: XCTestCase {
 			))
 	}
 
+	func testSignatures() async throws {
+		let fixtures = try await fixtures()
+
+		// Signing with installation key
+		let signature = try fixtures.alixClient.signWithInstallationKey(
+			message: "Testing")
+		XCTAssertTrue(
+			try fixtures.alixClient.verifySignature(
+				message: "Testing", signature: signature))
+		XCTAssertFalse(
+			try fixtures.alixClient.verifySignature(
+				message: "Not Testing", signature: signature))
+
+		let alixInstallationId = fixtures.alixClient.installationID
+
+		XCTAssertTrue(
+			try fixtures.alixClient.verifySignatureWithInstallationId(
+				message: "Testing",
+				signature: signature,
+				installationId: alixInstallationId
+			))
+		XCTAssertFalse(
+			try fixtures.alixClient.verifySignatureWithInstallationId(
+				message: "Not Testing",
+				signature: signature,
+				installationId: alixInstallationId
+			))
+		XCTAssertFalse(
+			try fixtures.alixClient.verifySignatureWithInstallationId(
+				message: "Testing",
+				signature: signature,
+				installationId: fixtures.boClient.installationID
+			))
+		XCTAssertTrue(
+			try fixtures.boClient.verifySignatureWithInstallationId(
+				message: "Testing",
+				signature: signature,
+				installationId: alixInstallationId
+			))
+
+		try fixtures.alixClient.deleteLocalDatabase()
+		let key = try Crypto.secureRandomBytes(count: 32)
+		let options = ClientOptions.init(
+			api: .init(env: .local, isSecure: false),
+			dbEncryptionKey: key
+		)
+
+		// Creating a new client
+		let alixClient2 = try await Client.create(
+			account: fixtures.alix,
+			options: options
+		)
+
+		XCTAssertTrue(
+			try alixClient2.verifySignatureWithInstallationId(
+				message: "Testing",
+				signature: signature,
+				installationId: alixInstallationId
+			))
+		XCTAssertFalse(
+			try alixClient2.verifySignatureWithInstallationId(
+				message: "Testing2",
+				signature: signature,
+				installationId: alixInstallationId
+			))
+	}
+
 }

XMTP.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |spec|
   spec.name         = "XMTP"
-  spec.version      = "3.0.7"
+  spec.version      = "3.0.8"
   spec.summary      = "XMTP SDK Cocoapod"
 
   spec.description  = <<-DESC
@@ -22,7 +22,7 @@ Pod::Spec.new do |spec|
 
   spec.dependency 'CSecp256k1', '~> 0.2'
   spec.dependency "Connect-Swift", "= 1.0.0"
-  spec.dependency 'LibXMTP', '= 3.0.3'
+  spec.dependency 'LibXMTP', '= 3.0.5'
   spec.dependency 'CryptoSwift', '= 1.8.3'
 
   spec.ios.deployment_target = '14.0'

XMTPiOSExample/XMTPiOSExample.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved

@@ -41,8 +41,8 @@
       "kind" : "remoteSourceControl",
       "location" : "https://github.com/xmtp/libxmtp-swift.git",
       "state" : {
-        "revision" : "d44798db766bd82e93c4f49f9997b5369f927971",
-        "version" : "3.0.3"
+        "revision" : "77fd4bb5a04281b30e887dcc8739497acaa7a3a6",
+        "version" : "3.0.5"
       }
     },
     {