RSA非对称加密（字符串公钥/16进制字符串输出）
功能：
Swift版，RSA字符串公钥加密，输出16进制或Base64字符串结果。
使用SecKey，无需引入openSSL，支持iOS9以上。
使用方法：
let key : NSString = "MIGfMA0........IwIDAQAB"
let str : NSString? = RSACrypto.encryptString(content: "123456", pubKey: key, type: .hex) as NSString?
NSLog("%@", str ?? "err")参考资料：
swift-RSA(一)
https://www.jianshu.com/p/d2cb314d30ec
iOS RSA加密算法
https://www.jianshu.com/p/90c6ac200888
[Swift] 指针UnsafePointer
https://www.jianshu.com/p/e90393ba2aea
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