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)

}