6PWadPn8

1extern void hmac_sha1(const unsigned char *inText, int inTextLength, unsigned char* inKey, const unsigned int inKeyLength, unsigned char *outDigest);
2	
3- (NSString *)sign: (NSString *)stringToSign {
4    NSString *secretKey = @"xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
5    const unsigned char *inText = (unsigned char *)[stringToSign UTF8String];
6    int inTextLength = [stringToSign length];
7    unsigned char *inKey = (unsigned char *)[secretKey UTF8String];
8    const unsigned int inKeyLength = (unsigned int)[secretKey length];
9    unsigned char *outDigest;
10
11    hmac_sha1(inText, inTextLength, inKey, inKeyLength, outDigest);
12    NSString *output = [NSString stringWithUTF8String:(const char *)outDigest];
13
14    return output;
15}
16	
17unsigned char *outDigest;
18	
19#define HMACSHA1_DIGEST_SIZE 20
20void *outDigest = malloc(HMACSHA1_DIGEST_SIZE);
21	
22NSString *output = [[NSString alloc] initWithBytesNoCopy:outDigest
23                                     length:HMACSHA1_DIGEST_SIZE
24                                     encoding:NSASCIIStringEncoding
25                                     freeWhenDone:YES];
26	
27NSUInteger byteCount = [stringToSign lengthOfBytesUsingEncoding:NSUTF8StringEncoding];