Swift5 Data 扩展生成MD5值

extension Data {
    func hexString() -> String {
        var t = ""
        let ts = [UInt8](self)
        for one in ts {
            t.append(String.init(format: "%02x", one))
        }
        return t
    }
    
    mutating func MD5() -> Data {
        var da = Data.init(count: Int(CC_MD5_DIGEST_LENGTH))
        let unsafe = [UInt8](self)
        return da.withUnsafeBytes { (bytes) -> Data in
            let b = bytes.baseAddress!.bindMemory(to: UInt8.self, capacity: 4).predecessor()
            let mb = UnsafeMutablePointer(mutating: b)
            CC_MD5(unsafe, CC_LONG(count),mb)
            return da
        }
        // use:
        // let t = "Hello world!!"
        // var d = t.data(using: .utf8)!
        // print(d.MD5().hexString())
        // 1d94dd7dfd050410185a535b9575e184
    }
}

SWIFT