Creating SHA1 Hash from NSString

Question

How can I create a SHA1 from a NSString.

Let\'s say the NSString is set up as:

NSString *message = @\"Message\";

I can

Answer 1

- (NSString *)sha1:(NSString *)str {
const char *cStr = [str UTF8String];
unsigned char result[CC_SHA1_DIGEST_LENGTH];
CC_SHA1(cStr, strlen(cStr), result);
NSString *s = [NSString  stringWithFormat:
           @"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",
           result[0], result[1], result[2], result[3], result[4],
           result[5], result[6], result[7],
           result[8], result[9], result[10], result[11], result[12],
           result[13], result[14], result[15],
           result[16], result[17], result[18], result[19]
           ];

return s;
}