[darwin-framework-tool] Update CHIPToolKeyPair implementation to not use matter sdk specific APIs but native APIS (#36723)

Author: vivien-apple

examples/darwin-framework-tool/BUILD.gn

@@ -200,11 +200,11 @@ executable("darwin-framework-tool") {
     "commands/clusters/WriteAttributeCommandBridge.h",
     "commands/common/CHIPCommandBridge.mm",
     "commands/common/CHIPCommandStorageDelegate.mm",
-    "commands/common/CHIPToolKeypair.mm",
     "commands/common/CertificateIssuer.h",
     "commands/common/CertificateIssuer.mm",
     "commands/common/ControllerStorage.h",
     "commands/common/ControllerStorage.mm",
+    "commands/common/DFTKeypair.mm",
     "commands/common/DeviceDelegate.h",
     "commands/common/DeviceDelegate.mm",
     "commands/common/MTRDevice_Externs.h",

examples/darwin-framework-tool/commands/common/CHIPCommandBridge.mm

@@ -18,7 +18,7 @@
 
 #include "CHIPCommandBridge.h"
 
-#import "CHIPToolKeypair.h"
+#import "DFTKeypair.h"
 #import <Matter/Matter.h>
 
 #include <lib/core/CHIPConfig.h>

examples/darwin-framework-tool/commands/common/CHIPToolKeypair.mm

@@ -17,7 +17,7 @@
  */
 
 #import "CertificateIssuer.h"
-#import "CHIPToolKeypair.h"
+#import "DFTKeypair.h"
 
 #include <lib/support/logging/CHIPLogging.h>
 
@@ -61,17 +61,13 @@ - (instancetype)init
 - (void)startWithStorage:(id<MTRStorage>)storage
                    error:(NSError * _Nullable __autoreleasing * _Nonnull)error
 {
-    __auto_type * signingKey = [[CHIPToolKeypair alloc] init];
-
-    __auto_type err = [signingKey createOrLoadKeys:storage];
-    if (CHIP_NO_ERROR != err) {
-        *error = [NSError errorWithDomain:@"Error" code:0 userInfo:@{ @"reason" : @"Error creating or loading keys" }];
+    __auto_type * signingKey = [DFTKeypair createKeypairWithStorage:storage error:error];
+    if (!signingKey) {
         return;
     }
 
     __auto_type * rootCertificate = [MTRCertificates createRootCertificate:signingKey issuerID:@(kIssuerId) fabricID:nil error:error];
-    if (nil == rootCertificate) {
-        *error = [NSError errorWithDomain:@"Error" code:0 userInfo:@{ @"reason" : @"Error creating root certificate" }];
+    if (!rootCertificate) {
         return;
     }
 
@@ -82,15 +78,12 @@ - (void)startWithStorage:(id<MTRStorage>)storage
 
 - (id<MTRKeypair>)issueOperationalKeypairWithControllerStorage:(ControllerStorage *)storage error:(NSError * _Nullable __autoreleasing * _Nonnull)error
 {
-    __auto_type * keypair = [[CHIPToolKeypair alloc] init];
-
-    __auto_type err = [keypair createOrLoadKeys:storage];
-    if (CHIP_NO_ERROR != err) {
-        *error = [NSError errorWithDomain:@"Error" code:0 userInfo:@{ @"reason" : @"Error creating or loading keys" }];
+    __auto_type * signingKey = [DFTKeypair createKeypairWithStorage:storage error:error];
+    if (!signingKey) {
         return nil;
     }
 
-    return keypair;
+    return signingKey;
 }
 
 - (void)issueOperationalCertificateForRequest:(MTROperationalCSRInfo *)csrInfo

examples/darwin-framework-tool/commands/common/CertificateIssuer.mm

@@ -17,15 +17,15 @@
  */
 
 #import <Matter/Matter.h>
-#include <crypto/CHIPCryptoPAL.h>
 
-@interface CHIPToolKeypair : NSObject <MTRKeypair>
-- (BOOL)initialize;
-- (NSData *)signMessageECDSA_RAW:(NSData *)message;
+NS_ASSUME_NONNULL_BEGIN
+
+@interface DFTKeypair : NSObject <MTRKeypair>
+- (instancetype)init NS_UNAVAILABLE;
++ (instancetype)createKeypairWithStorage:(id)storage error:(NSError * _Nullable __autoreleasing *)error;
+- (NSData *)signMessageECDSA_DER:(NSData *)message;
 - (SecKeyRef)copyPublicKey;
-- (CHIP_ERROR)Serialize:(chip::Crypto::P256SerializedKeypair &)output;
-- (CHIP_ERROR)Deserialize:(chip::Crypto::P256SerializedKeypair &)input;
-- (CHIP_ERROR)createOrLoadKeys:(id)storage;
 - (NSData *)getIPK;
-
 @end
+
+NS_ASSUME_NONNULL_END