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    Objective-C-Bridging-Header.h
    #import <CommonCrypto/CommonCrypto.h>
    
    String.swift
    extension String {
    
        var MD5: String? {
            let length = Int(CC_MD5_DIGEST_LENGTH)
            var digest = [UInt8](repeating: 0, count: length)
    
            if let d = self.data(using: .utf8) {
                _ = d.withUnsafeBytes { (body: UnsafePointer<UInt8>) in
                    CC_MD5(body, CC_LONG(d.count), &digest)
                }
            }
    
            return (0 ..< length).reduce("") {
                $0 + String(format: "%02x", digest[$1])
            }
        }
    
    }
    

    http://stackoverflow.com/questions/24123518/how-to-use-cc-md5-method-in-swift-language