OC 字符串包含中文sha1加密算法

-(NSString *)sha1

{

  // see http://www.makebetterthings.com/iphone/how-to-get-md5-and-sha1-in-objective-c-ios-sdk/

  NSData *data = [**self** dataUsingEncoding:NSUTF8StringEncoding];

  uint8_t digest[CC_SHA1_DIGEST_LENGTH];



  CC_SHA1(data.bytes, (CC_LONG)data.length, digest);



  NSMutableString *output = [NSMutableString stringWithCapacity:CC_SHA1_DIGEST_LENGTH * 2];



  **for** (**int** i = 0; i < CC_SHA1_DIGEST_LENGTH; i++) {

    [output appendFormat:@"%02x", digest[i]];

  }



  **return** output;

}