#ifndef bridge_h  
#define bridge_h  
  
#import <CommonCrypto/CommonDigest.h>  
  
#endif /* bridge_h */  

import Foundation  
  
extension String {  
  var md5 : String{  
    let str = self.cString(using: String.Encoding.utf8)  
    let strLen = CC_LONG(self.lengthOfBytes(using: String.Encoding.utf8))  
    let digestLen = Int(CC_MD5_DIGEST_LENGTH)  
    let result = UnsafeMutablePointer<CUnsignedChar>.allocate(capacity: digestLen)  
      
    CC_MD5(str!, strLen, result)  
      
    let hash = NSMutableString()  
    for i in 0 ..< digestLen {  
      hash.appendFormat("x", result[i])  
    }  
    result.deinitialize()  
      
    return String(format: hash as String)  
  }  
}