I cannot seem to find what format should be included in the TLS response after I get the challenge. Where can I find that info?
Say I was doing it in PHP, should it look like:
$nonce = "somenoncevaluehere";
$qop = "auth";
$charset = "utf-8";
$algorithm = "md5-sess";
$server = "example.com";
$user = "bob";
$pass = "somepass";
$md5Response = "realm=$server,nonce=$nonce,qop=$qop,charset=$charset,algorithm=$algorithm,xmpp,$server,$user,$pass";
I found a cocoa version
NSMutableString *buffer = [NSMutableString stringWithCapacity:100];
[buffer appendFormat:#"username=\"%#\",", username];
[buffer appendFormat:#"realm=\"%#\",", realm];
[buffer appendFormat:#"nonce=\"%#\",", nonce];
[buffer appendFormat:#"cnonce=\"%#\",", cnonce];
[buffer appendFormat:#"nc=00000001,"];
[buffer appendFormat:#"qop=auth,"];
[buffer appendFormat:#"digest-uri=\"%#\",", digestURI];
[buffer appendFormat:#"response=%#,", [self response]];
[buffer appendFormat:#"charset=utf-8"];
NSLog(#"decoded response: %#", buffer);
NSData *utf8data = [buffer dataUsingEncoding:NSUTF8StringEncoding];
return [utf8data encodeBase64];
Related
I am working on my first iPhone application, in that application I have to calculate the length of NSString, I have tried the available methods and solutions here on SO but for the length is always wrong. For example for a string "test4" NSString.length returns 12 while it should return 5.
I have tried NSString's length property and lengthOfBytesUsingEncoding but both return the same result.
Any help would be appreciated.
EDIT
NSString *string = #"test4";
[string lengthOfBytesUsingEncoding:NSUTF8StringEncoding]; // returns 12
string.length; // returns 12
Complete Code
+(NSString *)AES256Encrypt:(NSString *)data withKey:(NSString *)rawkey{
rawkey = [NSString stringWithFormat:#"%#%#", #"123456789023456", rawkey];
rawkey = [rawkey substringWithRange:NSMakeRange(0, 32)];
NSData *key = [rawkey dataUsingEncoding:NSUTF8StringEncoding];
NSData *iv = [key subdataWithRange:NSMakeRange(0, 16)];
const char *bytes = [data cStringUsingEncoding:NSUTF8StringEncoding];
NSLog(#"%d", data.length); // prints 12
data = [self encode:bytes length:data.length];
NSData *rawData = [data dataUsingEncoding:NSUTF8StringEncoding];
CCCryptorStatus status = kCCSuccess;
NSData *encrypted = [rawData dataEncryptedUsingAlgorithm:kCCAlgorithmAES128 key:key initializationVector:iv options:kCCOptionPKCS7Padding error:&status];
NSString *text = [encrypted base64EncodedString];
return text;
}
Thanks
NSString *myString = #"test4";
int i =myString.length;
NSLog(#"Count =%d",i);
which print Count = 5
I'm using the NSData+compression.h and the Base64Transcoder.h elements to be able to zip and unzip content.
Basically to unzip the server responses.
The unzip method works perfectly
+ (NSString *) unzip: (NSString*) stringValue{
Byte inputData[[stringValue lengthOfBytesUsingEncoding:NSUTF8StringEncoding]];
[[stringValue dataUsingEncoding:NSUTF8StringEncoding] getBytes:inputData];
size_t inputDataSize = (size_t)[stringValue length];
size_t outputDataSize = EstimateBas64DecodedDataSize(inputDataSize);
Byte outputData[outputDataSize];//prepare a Byte[] for the decoded data
Base64DecodeData(inputData, inputDataSize, outputData, &outputDataSize);
NSData *theData = [[NSData alloc] initWithBytes:outputData length:outputDataSize];
//And now we gunzip:
NSData* result = [theData gzipInflate];//make bigger==gunzip
NSString *temp = [[NSString alloc] initWithData:result encoding:NSUTF8StringEncoding];
return temp;
}
But when I try to zip a content, using the simetric way, the gzipDeflate fails, and return an empty or nil value.
This is my zip code
+ (NSData *) zip:(NSData *) theSourceData {
// And now we zip:
NSData *result = [theSourceData gzipDeflate];
Byte inputData[[result length]];
[result getBytes:inputData];
size_t inputDataSize = (size_t)[result length];
size_t outputDataSize = EstimateBas64DecodedDataSize(inputDataSize);
char outputData[outputDataSize];//prepare a Byte[] for the decoded data
Base64EncodeData(inputData, inputDataSize, outputData, &outputDataSize, NO);
NSData *theData = [[NSData alloc] initWithBytes:outputData length:outputDataSize];
return theData;
}
Any suggestions?
Thanks
The problem was on the Base64 encoder.
+ (NSString *) zip:(NSData *) theSourceData {
// And now we zip:
NSData *result = [theSourceData gzipDeflate];
NSString *source = [NSString base64StringFromData:result length:[result length]];
return source;
}
We've integrated the base64StringFromData:length: method to solve it.
Thanks,
Ivan
I have some Bytes of image in my string and i want to draw it to UIImageView ...Here is my code
NSString* str= #"<89504e47 0d0a1a0a 0000000d 49484452 ........... 454e44ae 426082>";
NSData* data=[str dataUsingEncoding:NSUTF8StringEncoding];
NSLog(#"My NSDATA %#",data);
imageView.image=[UIImage imageWithData:data];
Now when i saw that printed data on console it is not in same format what i gave to that string..The output is something like.....
<3c383935 30346534 37203064 30613161..........
So my imageview show nothing..... please help
if question was: How to convert string data to image then this is answer.
NSData *imgData = [NSData dataWithContentsOfFile:[[NSBundle mainBundle] pathForResource:#"icon" ofType:#"png"]];
// set your string data into inputString var
NSString *inputString = [imgData description];
NSLog(#"input string %#",inputString);
// clearing string from trashes
NSString *dataStr = [inputString stringByTrimmingCharactersInSet:[NSCharacterSet characterSetWithCharactersInString:#"<>"]];
// separate by words of 4 bytes
NSArray *words = [dataStr componentsSeparatedByString:#" "];
// calculate number of bytes
NSArray *sizes = [words valueForKey:#"length"];
int sizeOfBytes = 0;
for (NSNumber *size in sizes) {
sizeOfBytes += [size intValue]/2;
}
int bytes[sizeOfBytes];
int counts = 0;
for (NSString *word in words) {
// convert each word from string to int
NSMutableString *ostr = [NSMutableString stringWithCapacity:[word length]];
while ([word length] > 0) {
[ostr appendFormat:#"%#", [word substringFromIndex:[word length] - 2]];
word = [word substringToIndex:[word length] - 2];
}
NSScanner *scaner = [NSScanner scannerWithString:ostr];
unsigned int val;
[scaner scanHexInt:&val];
bytes[counts] = val;
counts++;
}
// get NSData form c array
NSData* data = [NSData dataWithBytes:bytes length:sizeOfBytes];
NSLog(#"My NSDATA %#",data);
// your image is ready
UIImage *image = [UIImage imageWithData:data];
NSLog(#"image: %#",image);
what you are seeing in NSLog output are the ASCII codes of the string characters.
for example:
NSString* str = #"A";
NSData* data=[str dataUsingEncoding:NSUTF8StringEncoding];
NSLog(#"%#",data);
you will see something like:
<41....
that's because 0x41 is the code for letter A.
Same is happening with your string.
The data is exactly what you're feeding it: a simple string (printed as raw byte values). But I guess your input string is a hexdump and you manually need to turn into bytes.
How to create a SHA256 of a String in iphone/objective c...
Sha256 in Objective-C for iPhone
I have read this..but i am not able to understand this..
I want to create output similar to php funcation as follows:-
$hash = hash_hmac("sha256", implode(';', $hash_parameters), $api_key);
where hash parameters is the array of arguments...
Can you write this as a method which will take the input string...?
And what will be the output of method NSData or NSString..??
I have to create a request with this..??
So in the request object..
[theRequest setHTTPBody:requestBody];
what should be the type of requestBody??
I'm not sure I fully understand your questions but if you're looking to create a hashed string you CAN pass in your parameters as arguments to a hash function.
-(void)generateHashedString {
NSString *key = #"Some random string";
//enter your objects you want to encode in the data object
NSString *data = [NSString stringWithFormat:#"%#%#%#", #"sha256", hash_parameters, api_key];
const char *cKey = [key cStringUsingEncoding:NSASCIIStringEncoding];
const char *cData = [data cStringUsingEncoding:NSASCIIStringEncoding];
unsigned char cHMAC[CC_SHA256_DIGEST_LENGTH];
CCHmac(kCCHmacAlgSHA256, cKey, strlen(cKey), cData, strlen(cData), cHMAC);
NSData *HMAC = [[NSData alloc] initWithBytes:cHMAC
length:sizeof(cHMAC)];
NSString *hash = [HMAC base64Encoding];
}
This will give you an NSString of hash that you can use to make your requests. NSLog(#"%#",hash); To see what you generated!
Make sure you #import <CommonCrypto/CommonHMAC.h> too
I didn't compare the following code to the PHP function output but it works for me:
+(NSString *)signWithKey:(NSString *)key usingData:(NSString *)data
{
const char *cKey = [key cStringUsingEncoding:NSASCIIStringEncoding];
const char *cData = [data cStringUsingEncoding:NSASCIIStringEncoding];
unsigned char cHMAC[CC_SHA256_DIGEST_LENGTH];
CCHmac(kCCHmacAlgSHA256, cKey, strlen(cKey), cData, strlen(cData), cHMAC);
NSData *HMAC = [[NSData alloc] initWithBytes:cHMAC length:sizeof(cHMAC)];
return [[HMAC.description stringByTrimmingCharactersInSet:[NSCharacterSet characterSetWithCharactersInString:#"<>"]] stringByReplacingOccurrencesOfString:#" " withString:#""];
}
Let me know if it was helpful...
I spend a hole day, trying to convert the generated hash (bytes) into readable data. I used the base64 encoded like the answer above and it didn´t work at all for me (b.t.w. you need and an external .h to be able to use the base64 encoding, which i had).
So what i did was this (which works perfectly without an external .h):
CCHmac(kCCHmacAlgSHA256, cKey, strlen(cKey), cData, strlen(cData), cHMAC);
// Now convert to NSData structure to make it usable again
NSData *out = [NSData dataWithBytes:cHMAC length:CC_SHA256_DIGEST_LENGTH];
// description converts to hex but puts <> around it and spaces every 4 bytes
NSString *hash = [out description];
hash = [hash stringByReplacingOccurrencesOfString:#" " withString:#""];
hash = [hash stringByReplacingOccurrencesOfString:#"<" withString:#""];
hash = [hash stringByReplacingOccurrencesOfString:#">" withString:#""];
// hash is now a string with just the 40char hash value in it
NSLog(#"%#",hash);
For a reference this HMac hashing will work on PHP.
- (NSString *)getToken:(NSString *)queryString
{
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setTimeZone:[NSTimeZone timeZoneWithName:#"UTC"]];
[formatter setDateFormat:#"yyyy-MM-dd HH:mm:ss"];
NSString *dateString = [formatter stringFromDate:[NSDate date]];
NSDate *dateTodayUTC = [formatter dateFromString:dateString];
NSString *nowTimestamp = [NSString stringWithFormat:#"%.f", [dateTodayUTC timeIntervalSince1970]];
NSString *hashCombinations = [[NSString alloc] initWithFormat:#"%#%#%.f", queryString, public_api_key, [dateTodayUTC timeIntervalSince1970]];
const char *privateKey = [private_api_key cStringUsingEncoding:NSUTF8StringEncoding];
const char *requestData = [hashCombinations cStringUsingEncoding:NSUTF8StringEncoding];
unsigned char cHMAC[CC_SHA256_DIGEST_LENGTH];
//HmacSHA256
CCHmac(kCCHmacAlgSHA256, // algorithm
privateKey, strlen(privateKey), // privateKey
requestData, strlen(requestData), // requestData
cHMAC); // length
NSString *hash;
NSMutableString* output = [NSMutableString stringWithCapacity:CC_SHA256_DIGEST_LENGTH * 2];
for(int i = 0; i < CC_SHA256_DIGEST_LENGTH; i++)
[output appendFormat:#"%02x", cHMAC[i]];
hash = output;
NSString *base64HashString = [self base64String:hash];
self.tokenLabel.text = hash;
NSLog(#"generated hash = %#", hash);
NSLog(#"base64 hash = %#", base64HashString);
NSLog(#"timestamp = %# nsdate utc = %#", nowTimestamp, dateString);
NSLog(#"combinations %#", hashCombinations);
return [base64HashString urlencode];
}
You can use this base64 method.
- (NSString *)base64String:(NSString *)str
{
NSData *theData = [str dataUsingEncoding: NSASCIIStringEncoding];
const uint8_t* input = (const uint8_t*)[theData bytes];
NSInteger length = [theData length];
static char table[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
NSMutableData* data = [NSMutableData dataWithLength:((length + 2) / 3) * 4];
uint8_t* output = (uint8_t*)data.mutableBytes;
NSInteger i;
for (i=0; i < length; i += 3) {
NSInteger value = 0;
NSInteger j;
for (j = i; j < (i + 3); j++) {
value <<= 8;
if (j < length) {
value |= (0xFF & input[j]);
}
}
NSInteger theIndex = (i / 3) * 4;
output[theIndex + 0] = table[(value >> 18) & 0x3F];
output[theIndex + 1] = table[(value >> 12) & 0x3F];
output[theIndex + 2] = (i + 1) < length ? table[(value >> 6) & 0x3F] : '=';
output[theIndex + 3] = (i + 2) < length ? table[(value >> 0) & 0x3F] : '=';
}
return [[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding];
}
I think it's more compact solution:
#import <CommonCrypto/CommonCrypto.h>
...
-(NSData*)Sha256WithKey:(NSData*)key andData:(NSData*)data{
NSMutableData* result = [NSMutableData
dataWithCapacity:CC_SHA256_DIGEST_LENGTH];
CCHmac(kCCHmacAlgSHA256, [key bytes], [key length],
[data bytes], [data length], result.mutableBytes);
return result;
}
....
This question is related to Iphone SDK, NSData and UIImage.
I am trying to create an image from the Avatar Data returned from the xmpp like the following:
<presence from='yyy#184.73.164.51/spark' to='ken#184.73.164.51/424978324712783686768453' id='Oj02v-45'><status>Away due to idle.</status><priority>0</priority><show>away</show><x xmlns='vcard-temp:x:update'><photo>a3f549fa9705e7ead2905de0b6a804227ecdd404</photo></x><x xmlns='jabber:x:avatar'><hash>a3f549fa9705e7ead2905de0b6a804227ecdd404</hash></x></presence>
So in this case, I assume that a3f549fa9705e7ead2905de0b6a804227ecdd404 is the photo data.
So How can I transfer this into NSData?
I think if I can get the NSData object,
I can easily create the UIImage, right?
I think "a3f549fa9705e7ead2905de0b6a804227ecdd404" is the photo data
this is my codes:
NSString* command = #"a3f549fa9705e7ead2905de0b6a804227ecdd404";
command = [command stringByReplacingOccurrencesOfString:#" " withString:#""];
NSMutableData *commandToSend= [[NSMutableData alloc] init];
unsigned char whole_byte;
char byte_chars[3] = {'\0','\0','\0'};
int i;
for (i=0; i < [command length]/2; i++) {
byte_chars[0] = [command characterAtIndex:i*2];
byte_chars[1] = [command characterAtIndex:i*2+1];
whole_byte = strtol(byte_chars, NULL, 16);
[commandToSend appendBytes:&whole_byte length:1];
}
UIImage *image = [UIImage imageWithData: commandToSend];
However,
it doesn't work.
Anyone knows what's wrong with it?
In XMPPPresence.m add this method
-(NSString *)photo {
NSXMLElement *xElement = [self elementForName:#"x" xmlns:#"vcard-temp:x:update"];
NSString *photoHash = [[xElement elementForName:#"photo"]stringValue];
return photoHash;
}
// In XMPPStream's delegate:
- (void)xmppStream:(XMPPStream *)stream didReceivePresence:
(XMPPPresence *)presence {
NSString *photoHash = [presence photo];
if ([photoHash length] > 0) { // in case when there's no photo hash
XMPPJID *rosterJID = [presence from];
BOOL requestPhoto = ... // determine if you need to request new
photo or nor
if (requestPhoto) {
NSXMLElement *iqAvatar = [NSXMLElement elementWithName:#"iq"];
NSXMLElement *queryAvatar = [NSXMLElement elementWithName:#"vCard"
xmlns:#"vcard-temp"];
[iqAvatar addAttributeWithName:#"type" stringValue:#"get"];
[iqAvatar addAttributeWithName:#"to" stringValue:[rosterJID full]];
[iqAvatar addChild:queryAvatar];
XMPPIQ *avatarRequestIQ = [XMPPIQ iqFromElement:iqAvatar];
[stream sendElement:avatarRequestIQ];
}
}
}
// And when buddy will send photo, it will be in vcard BASE64-encoded.
// You will receive it as IQ:
- (BOOL)xmppStream:(XMPPStream *)stream didReceiveIQ:(XMPPIQ *)iq {
XMPPElement *vCardPhotoElement = (XMPPElement *)[[iq
elementForName:#"vCard"] elementForName:#"PHOTO"];
if (vCardPhotoElement != nil) {
// avatar data
NSString *base64DataString = [[vCardPhotoElement
elementForName:#"BINVAL"] stringValue];
NSData *imageData = [NSData
dataFromBase64String:base64DataString]; // you need to get NSData
BASE64 category
UIImage *avatarImage = [UIImage imageWithData:imageData];
XMPPJID *senderJID = [iq from];
[self xmppStream:stream didReceiveImage:avatarImage
forBuddy:senderJID]; // this is my custom delegate method where I
save new avatar to cache
}
return NO;
}
Hope this will help you.
That is the picture hash you now have to send a vcard request which will contain the same hash for verification and binval containing the picture data in base64