I'm trying to understand why algorithm for calculation of
oauth_signature does not give me the same result as shown here:
http://dev.twitter.com/pages/xauth
In my case I'm getting signedSK = 'MUYmiobRdoK6s0ZVqo4xQNNO17w='
If I URL encode such result it's still very different from
yUDBrcMMm6ghqBEKCFKVoJPIacU%3D
I've tried different implementations, all of them give the same
result. After few hours of exercises with all this stuff I completely
run out of ideas, please help
// Test with input data taken from Twitter page
NSString *s= @"POST&https%3A%2F%2Fapi.twitter.com%2Foauth
%2Faccess_token&oauth_consumer_key%3DsGNxxnqgZRHUt6NunK3uw
%26oauth_nonce%3DWLxsobj4rhS2xmCbaAeT4aAkRfx4vSHX4OnYpTE77hA
%26oauth_signature_method%3DHMAC-SHA1%26oauth_timestamp
%3D1276101652%26oauth_version%3D1.0%26x_auth_mode%3Dclient_auth
%26x_auth_password%3D%2525%2526123%2521aZ%252B
%2528%2529456242134%26x_auth_username%3DtpFriendlyGiant";
NSString *k = @"5kEQypKe7lFHnufLtsocB1vAzO07xLFgp2Pc4sp2vk&";
NSString *signedSK = [NetworkManager base64forData:[NetworkManager
HMACSHA1withKey:k forString:s]];
// Source code
+ (NSData *)HMACSHA1withKey:(NSString *)key forString:(NSString
*)string
{
NSData *clearTextData = [string
dataUsingEncoding:NSUTF8StringEncoding];
NSData *keyData = [key dataUsingEncoding:NSUTF8StringEncoding];
uint8_t digest[CC_SHA1_DIGEST_LENGTH] = {0};
CCHmacContext hmacContext;
CCHmacInit(&hmacContext, kCCHmacAlgSHA1, keyData.bytes,
keyData.length);
CCHmacUpdate(&hmacContext, clearTextData.bytes,
clearTextData.length);
CCHmacFinal(&hmacContext, digest);
return [NSData dataWithBytes:digest length:CC_SHA1_DIGEST_LENGTH];
}
//Source http://www.cocoadev.com/index.pl?BaseSixtyFour
+ (NSString *)base64forData:(NSData *)data
{
static const char encodingTable[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
if ([data length] == 0)
return @"";
char *characters = malloc((([data length] + 2) / 3) * 4);
if (characters == NULL)
return nil;
NSUInteger length = 0;
NSUInteger i = 0;
while (i < [data length])
{
char buffer[3] = {0,0,0};
short bufferLength = 0;
while (bufferLength < 3 && i < [data length])
buffer[bufferLength++] = ((char *)[data bytes])[i++];
// Encode the bytes in the buffer to four characters,
including padding "=" characters if necessary.
characters[length++] = encodingTable[(buffer[0] & 0xFC) >> 2];
characters[length++] = encodingTable[((buffer[0] & 0x03) << 4)
| ((buffer[1] & 0xF0) >> 4)];
if (bufferLength > 1)
characters[length++] = encodingTable[((buffer[1] &
0x0F) << 2) |
((buffer[2] & 0xC0) >> 6)];
else characters[length++] = '=';
if (bufferLength > 2)
characters[length++] = encodingTable[buffer[2] & 0x3F];
else characters[length++] = '=';
}
return [[[NSString alloc] initWithBytesNoCopy:characters
length:length encoding:NSASCIIStringEncoding freeWhenDone:YES]
autorelease];
}
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