Signing: removed API for loading key from a file

This is a leftover from when we were going to embed the certificate as a file, but it's not needed anymore.

RevenueCat.xcodeproj/project.pbxproj

@@ -478,7 +478,6 @@
 		57E415F12846997B00EA5460 /* PurchasesAttributionDataTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 57E415F02846997B00EA5460 /* PurchasesAttributionDataTests.swift */; };
 		57E415FF28469EAB00EA5460 /* PurchasesGetProductsTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 57E415FE28469EAB00EA5460 /* PurchasesGetProductsTests.swift */; };
 		57E6195028D291DC0093170C /* StoreKit2CachingProductsManagerTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 57E6194F28D291DC0093170C /* StoreKit2CachingProductsManagerTests.swift */; };
-		57E6C26C29722EDA001AFE98 /* invalid_certificate.cer in Resources */ = {isa = PBXBuildFile; fileRef = 57E6C26B29722EDA001AFE98 /* invalid_certificate.cer */; };
 		57E6C27C29723A94001AFE98 /* Signing.swift in Sources */ = {isa = PBXBuildFile; fileRef = 57E6C27B29723A94001AFE98 /* Signing.swift */; };
 		57E6C27E29723F9E001AFE98 /* SigningTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 57E6C27D29723F9E001AFE98 /* SigningTests.swift */; };
 		57E6C2C72975AAE1001AFE98 /* FileReader.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5759B407296DFA75002472D5 /* FileReader.swift */; };
@@ -1145,7 +1144,6 @@
 		57E415F02846997B00EA5460 /* PurchasesAttributionDataTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = PurchasesAttributionDataTests.swift; sourceTree = "<group>"; };
 		57E415FE28469EAB00EA5460 /* PurchasesGetProductsTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = PurchasesGetProductsTests.swift; sourceTree = "<group>"; };
 		57E6194F28D291DC0093170C /* StoreKit2CachingProductsManagerTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = StoreKit2CachingProductsManagerTests.swift; sourceTree = "<group>"; };
-		57E6C26B29722EDA001AFE98 /* invalid_certificate.cer */ = {isa = PBXFileReference; lastKnownFileType = text; path = invalid_certificate.cer; sourceTree = "<group>"; };
 		57E6C27B29723A94001AFE98 /* Signing.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Signing.swift; sourceTree = "<group>"; };
 		57E6C27D29723F9E001AFE98 /* SigningTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SigningTests.swift; sourceTree = "<group>"; };
 		57E9CF0E290B2A4B00EE12D1 /* CachingTrialOrIntroPriceEligibilityChecker.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = CachingTrialOrIntroPriceEligibilityChecker.swift; sourceTree = "<group>"; };
@@ -1638,7 +1636,6 @@
 		2DDE559824C8B5D100DCB087 /* Resources */ = {
 			isa = PBXGroup;
 			children = (
-				57E6C26A29722EC6001AFE98 /* public_keys */,
 				2DDE559924C8B5E300DCB087 /* receipts */,
 			);
 			path = Resources;
@@ -2329,14 +2326,6 @@
 			path = Responses;
 			sourceTree = "<group>";
 		};
-		57E6C26A29722EC6001AFE98 /* public_keys */ = {
-			isa = PBXGroup;
-			children = (
-				57E6C26B29722EDA001AFE98 /* invalid_certificate.cer */,
-			);
-			path = public_keys;
-			sourceTree = "<group>";
-		};
 		57F3C0C929B7A04D0004FD7E /* Security */ = {
 			isa = PBXGroup;
 			children = (
@@ -2919,7 +2908,6 @@
 			buildActionMask = 2147483647;
 			files = (
 				2D4D6AF624F7193700B656BE /* verifyReceiptSample1.txt in Resources */,
-				57E6C26C29722EDA001AFE98 /* invalid_certificate.cer in Resources */,
 				2D4D6AF724F7193700B656BE /* base64encodedreceiptsample1.txt in Resources */,
 				5774F9BE2805E71100997128 /* Fixtures in Resources */,
 				5791CE80273F26A000E50C4B /* base64encoded_sandboxReceipt.txt in Resources */,

Sources/Security/Signing.swift

@@ -161,23 +161,6 @@ extension CryptoKit.Curve25519.Signing.PublicKey: SigningPublicKey {}
 
 extension Signing {
 
-    /// Loads the key in `url` and returns a `PublicKey`
-    /// - Throws: ``ErrorCode/configurationError`` if the certificate couldn't be loaded.
-    @available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.2, *)
-    static func loadPublicKey(in url: URL) throws -> PublicKey {
-        let data: Data
-        do {
-            data = try Data(contentsOf: url)
-        } catch {
-            throw ErrorUtils.configurationError(
-                message: Strings.configure.public_key_could_not_be_found(fileName: url.relativeString).description,
-                underlyingError: error
-            )
-        }
-
-        return try Self.loadPublicKey(with: data)
-    }
-
     /// Parses the binary `key` and returns a `PublicKey`
     /// - Throws: ``ErrorCode/configurationError`` if the certificate couldn't be loaded.
     @available(iOS 13.0, macOS 10.15, tvOS 13.0, watchOS 6.2, *)

Tests/UnitTests/Security/SigningTests.swift

@@ -37,24 +37,9 @@ class SigningTests: TestCase {
         expect(key.rawRepresentation).toNot(beEmpty())
     }
 
-    func testThrowsErrorIfPublicKeyFileDoesNotExist() throws {
-        let url = try XCTUnwrap(URL(string: "not_existing_file.cer"))
-
-        expect {
-            try Signing.loadPublicKey(in: url)
-        }.to(throwError { error in
-            expect(error).to(matchError(ErrorCode.configurationError))
-            expect(error.localizedDescription) == "There is an issue with your configuration. " +
-            "Check the underlying error for more details. Could not find public key 'not_existing_file.cer'"
-        })
-    }
-
     func testThrowsErrorIfPublicKeyFileCannotBeParsed() throws {
-        let url = try XCTUnwrap(Bundle(for: Self.self).url(forResource: "invalid_certificate",
-                                                           withExtension: "cer"))
-
         expect {
-            try Signing.loadPublicKey(in: url)
+            try Signing.loadPublicKey(with: .init([1, 2, 3]))
         }.to(throwError { error in
             expect(error).to(matchError(ErrorCode.configurationError))
             expect(error.localizedDescription) == "There is an issue with your configuration. " +