Swift版StringExtention方法MD5加密

extension String{

func MD5Digest()->String{

let input = (self as NSString).utf8String

let pointer = UnsafeMutablePointer<UInt8>.allocate(capacity: 16)

CC_MD5(input, (CC_LONG)(strlen(input)), pointer)

let str = NSMutableString()

for i in 0..<16{

str.appendFormat("%02x", pointer[i])

}

let backStr = str as String

return backStr

}

}