Swift - MD5加密；SHA1加密

在客户端开发中，我们常常遇到需要将数据加密保存或提交的问题，下面我们来看看两种常用的加密方式

(一) 首先我们需要引入库 import CommonCrypto

(二) 创建一个String扩展：代码如下

import CommonCrypto

extension String {

    ///MD5 加密
    func md5() -> String {
        let cStr = self.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
    }


    ///sha1 加密
    func sha1() -> String {
        //UnsafeRawPointer
        let data = self.data(using: String.Encoding.utf8)!
        var digest = [UInt8](repeating: 0, count:Int(CC_SHA1_DIGEST_LENGTH))
        let newData = NSData.init(data: data)
        CC_SHA1(newData.bytes, CC_LONG(data.count), &digest)
        let output = NSMutableString(capacity: Int(CC_SHA1_DIGEST_LENGTH))
        for byte in digest {
            output.appendFormat("%02x", byte)
        }
        return output as String
    }
  }

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