一丶说明

需要用到swift与oc的桥接文件;
利用桥接文件导入#import <CommonCrypto/CommonDigest.h>

二丶代码

// MARK:- MD5加密
func md5String(str:String) -> String{
 
    let cStr = str.cString(using: String.Encoding.utf8);
    let buffer = UnsafeMutablePointer<UInt8>.allocate(capacity: 16)
    CC_MD5(cStr!,(CC_LONG)(strlen(cStr!)), buffer)
    let md5String = NSMutableString();
    for i in 0 ..< 16{
        md5String.appendFormat("%02x", buffer[i])
    }
    free(buffer)
    return md5String as String
}

三丶扩展:

1.其他加密方式

https://github.com/krzyzanowskim/CryptoSwift

2.添加桥接文件:
参考
http://www.jianshu.com/p/27b9ff63ab6f

3.product Name:

Build Settings

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