第三方接入小记

    // 加密 转换为字符串

    func sign(dict:Dictionary<String,String>?,_ sign:String) -> String {

        let sortDict = dict?.sort{ $0.0 < $1.0 }

        var params = ""

        for (key,value) in sortDict! {

            params += "\(key)=\(value)&"

        }

        let index = params.endIndex.advancedBy(-1)

        params = params.substringToIndex(index)

        let signStr = sign + params + sign

        return  params + "&sign=" + md5(signStr)

    }

// md5加密

    func md5(sstring : String) -> String{

        let str = sstring.cStringUsingEncoding(NSUTF8StringEncoding)

        let strLen = CC_LONG(sstring.lengthOfBytesUsingEncoding(NSUTF8StringEncoding))

        let digestLen = Int(CC_MD5_DIGEST_LENGTH)

        let buffer = UnsafeMutablePointer<UInt8>.alloc(digestLen)

        CC_MD5(str!,strLen,buffer)

        let hash = NSMutableString()

        for i in 0 ..< digestLen {

            hash.appendFormat("%02x", buffer[i])

        }

        buffer.dealloc(digestLen)

        return String(format: hash as String)

    }

第三方接入小记

原文：http://www.cnblogs.com/madarax/p/5773765.html