EC private key creation from data failed

[zhouhao27]

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• I have read and understood the CONTRIBUTING guide
• I have read the Documentation
• I have searched for a similar issue in the project and found none

Issue Info

Info	Value
Platform Name	ios
Platform Version	14.0
CocoaLumberjack Version	e.g. 2.3.0
Integration Method	cocoapods
Xcode Version	Xcode 14.2
Repro rate	all the time (100%)
JWT version	3.0.0-beta.14

Issue Description and Steps

My demo application is able to generate RS256 and ES256 JWT token. It works for RS256 but doesn't work for ES256. The error message is:

Error Domain=NSOSStatusErrorDomain Code=-50 "EC private key creation from data failed" UserInfo={numberOfErrorsDeep=0, NSDescription=EC private key creation from data failed}

Here is my code:

    NSDictionary *header = @{
        @"alg": self.segment.selectedSegmentIndex == 0 ? @"ES256" : @"RS256",
        @"kid": @"NMK2ABbpUmxEg2MC_w1v3CsmrDiww1hxRIxrWwrEjv8",
        @"typ": @"JWT" // specify the token type
    };
    
    time_t timestamp = time(NULL); // current Unix timestamp
    NSNumber *timestampNow = @(timestamp); // convert to NSNumber
    
    int intValue = [timestampNow intValue]; // get integer value
    NSNumber *timestampCurrent = [NSNumber numberWithInt: intValue];
    intValue += 180; // add 180seconds
    NSNumber *expiration = [NSNumber numberWithInt:intValue];
    
    NSUUID *uuid = [NSUUID UUID];
    NSString *nonce = [uuid UUIDString];
    
    NSLog(@"%@", nonce);
    
    NSDictionary *payLoad = @{
        @"iat": timestampCurrent,
        @"aud": @"https://google.com",
        @"sub": @"POST",
        @"jti": nonce,
        @"iss": @"08af8def-0f9a-4669-b64d-390f3470e80c",
        @"exp": expiration
    };
        
    // Load the private key from a file
    NSString* fileName = self.segment.selectedSegmentIndex == 0 ? @"ec_private" : @"rsa-private";
    NSString *privateKeyPath = [[NSBundle mainBundle] pathForResource:fileName ofType:@"pem"];
    NSString *privateKey = [NSString stringWithContentsOfFile:privateKeyPath encoding:NSUTF8StringEncoding error:nil];
        
    id <JWTAlgorithmDataHolderProtocol> signDataHolder = [JWTAlgorithmRSFamilyDataHolder new]
        .keyExtractorType([JWTCryptoKeyExtractor privateKeyWithPEMBase64].type)
        .algorithmName(self.segment.selectedSegmentIndex == 0 ? JWTAlgorithmNameES256 : JWTAlgorithmNameRS256).secret(privateKey);

    JWTCodingResultType *result = [JWTEncodingBuilder encodePayload:payLoad]
        .headers(header)
        .addHolder(signDataHolder)
        .result;
    
    if (result.successResult) {
        // handle encoded result
        NSLog(@"encoded token: %@", result.successResult.encoded);
        [self updateTokenText:result.successResult.encoded];
    }
    else {
        // handle error
        NSLog(@"encode failed, error: %@",
              result.errorResult.error);
        [self updateTokenText:result.errorResult.error.localizedDescription];
    }

Please refer to my example project.

JWTDemo.zip