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After two days of frustration and cursing Twitter, I finally managed to do this. Here is my implementation. The class which will be used to make the request is "BL_TwitterRequest". This is only for obtaining the twitter request token. BL_TwitterRequest.h: <pre><code>#import <Foundation/Foundation.h> @interface BL_Request : NSObject <NSURLConnectionDelegate> @property (nonatomic, strong) NSMutableData *webData; -(void) makeRequest; </code></pre> Add the following NSString category at the top of the implementation class (BL_TwitterRequest.m). This will be used to get the URL encoded version of NSString. <pre><code>@implementation NSString (NSString_Extended) - (NSString *)urlencode { NSMutableString *output = [NSMutableString string]; const unsigned char *source = (const unsigned char *)[self UTF8String]; int sourceLen = strlen((const char *)source); for (int i = 0; i < sourceLen; ++i) { const unsigned char thisChar = source[i]; if (thisChar == ' '){ [output appendString:@"+"]; } else if (thisChar == '.' || thisChar == '-' || thisChar == '_' || thisChar == '~' || (thisChar >= 'a' && thisChar <= 'z') || (thisChar >= 'A' && thisChar <= 'Z') || (thisChar >= '0' && thisChar <= '9')) { [output appendFormat:@"%c", thisChar]; } else { [output appendFormat:@"%%%02X", thisChar]; } } return output; } @end </code></pre> Add the below function in "BL_TwitterRequest.m". It will be used to generate the oAuth nonce. The function basically generates a random string of a specified length. <pre><code>-(NSString*) generateRandomStringOfLength:(int)length { NSString *letters = @"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"; NSMutableString *randomString = [NSMutableString stringWithCapacity: length]; for (int i = 0; i < length; i++) { [randomString appendFormat: @"%C", [letters characterAtIndex: arc4random() % [letters length]]]; } return randomString; } </code></pre> Include the Base64 library from <a href="https://github.com/nicklockwood/Base64" rel="nofollow">here</a>. All you have to do is drag the "Base64.h" and "Base64.m" files into your project. Add the following imports: <pre><code>#include <CommonCrypto/CommonDigest.h> #include <CommonCrypto/CommonHMAC.h> #include <sys/types.h> #include <errno.h> #include <fcntl.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #import "Base64.h" </code></pre> Add another function as specified below. This will be used to get the HMAC-SHA1 value. <pre><code>- (NSString *)hmacsha1:(NSString *)data secret:(NSString *)key { const char *cKey = [key cStringUsingEncoding:NSASCIIStringEncoding]; const char *cData = [data cStringUsingEncoding:NSASCIIStringEncoding]; unsigned char cHMAC[CC_SHA1_DIGEST_LENGTH]; CCHmac(kCCHmacAlgSHA1, cKey, strlen(cKey), cData, strlen(cData), cHMAC); NSData *HMAC = [[NSData alloc] initWithBytes:cHMAC length:sizeof(cHMAC)]; NSString *hash = [HMAC base64EncodedString]; return hash; } </code></pre> Now for the main function that will make the request. <pre><code>-(void) makeRequest { _webData = [[NSMutableData alloc]init]; // WILL BE USED BY NSURLConnection NSString *httpMethod = @"POST"; NSString *baseURL = @"https://api.twitter.com/oauth/request_token"; NSString *oauthConsumerKey = @"YOUR_CONSUMER_KEY"; NSString *oauthConsumerSecret = @"YOUR_CONSUMER_SECRET"; NSString *oauth_timestamp = [NSString stringWithFormat:@"%.f", [[NSDate date]timeIntervalSince1970]]; NSString *oauthNonce = [self generateRandomStringOfLength:42]; NSString *oauthSignatureMethod = @"HMAC-SHA1"; NSString *oauthVersion = @"1.0"; NSString *oauthCallback = @"YOUR_TWITTER_CALLBACK_URL"; //1. PERCENT CODE EVERY KEY AND VALUE THAT WILL BE SIGNED AND // APPEND KEY AND VALUE WITH = AND & NSMutableString *parameterString = [[NSMutableString alloc]initWithFormat:@""]; [parameterString appendFormat:@"oauth_callback=%@", [oauthCallback urlencode]]; [parameterString appendFormat:@"&oauth_consumer_key=%@", [oauthConsumerKey urlencode]]; [parameterString appendFormat:@"&oauth_nonce=%@", [oauthNonce urlencode]]; [parameterString appendFormat:@"&oauth_signature_method=%@", [oauthSignatureMethod urlencode]]; [parameterString appendFormat:@"&oauth_timestamp=%@", [oauth_timestamp urlencode]]; [parameterString appendFormat:@"&oauth_version=%@", [oauthVersion urlencode]]; //2. CREATE SIGNATURE STRING WITH HTTP METHOD AND ENCODED BASE URL AND PARAMETER STRING NSString *signatureBaseString = [NSString stringWithFormat:@"%@&%@&%@", httpMethod, [baseURL urlencode], [parameterString urlencode]]; //3. GET THE SIGNING KEY NOW FROM CONSUMER SECRET NSString *signingKey = [NSString stringWithFormat:@"%@&", [oauthConsumerSecret urlencode]]; //4. GET THE OUTPUT OF THE HMAC ALOGRITHM NSString *oauthSignature = [self hmacsha1:signatureBaseString secret:signingKey]; // TIME TO MAKE THE CALL NOW NSMutableString *urlString = [[NSMutableString alloc]initWithFormat:@""]; [urlString appendFormat:@"%@", baseURL]; // INITIALIZE AUTHORIZATION HEADER NSMutableString *authHeader = [[NSMutableString alloc]initWithFormat:@""]; [authHeader appendFormat:@"OAuth "]; // MIND THE SPACE AFTER 'OAuth' [authHeader appendFormat:@"oauth_nonce=\"%@\",", [oauthNonce urlencode]]; [authHeader appendFormat:@"oauth_callback=\"%@\",", [oauthCallback urlencode]]; [authHeader appendFormat:@"oauth_signature_method=\"%@\",", [oauthSignatureMethod urlencode]]; [authHeader appendFormat:@"oauth_timestamp=\"%@\",", [oauth_timestamp urlencode]]; [authHeader appendFormat:@"oauth_consumer_key=\"%@\",", [oauthConsumerKey urlencode]]; [authHeader appendFormat:@"oauth_signature=\"%@\",", [oauthSignature urlencode]]; [authHeader appendFormat:@"oauth_version=\"%@\"", [oauthVersion urlencode]]; NSMutableURLRequest *request = [[NSMutableURLRequest alloc]initWithURL:[NSURL URLWithString:urlString]] ; [request setHTTPMethod:httpMethod]; [request setValue:authHeader forHTTPHeaderField:@"Authorization"]; NSURLConnection *connection = [[NSURLConnection alloc]initWithRequest:request delegate:self]; [connection start]; } </code></pre> Now just implement the NSURLConnection delegate methods to get the response. <pre><code>#pragma mark - Connection Delegate - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data { [_webData appendData:data]; } - (void)connectionDidFinishLoading:(NSURLConnection *)connection { NSString *resultString = [[NSString alloc]initWithData:_webData encoding:NSUTF8StringEncoding]; NSLog(@"RESULT STRING : %@", resultString); } </code></pre> If everything goes well the 'resultString' will have the oauth_token and oauth_token_secret. To make the call just do the following: <pre><code> BL_TwitterRequest *twitterRequest = [[BL_TwitterRequest alloc]init]; [twitterRequest makeRequest]; </code></pre> Remember any missed spaces or commas can result in an error. 
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