MD5（Message-Digest Algorithm 5）是一种广泛使用的密码散列函数，用于确保数据的完整性。尽管MD5因其设计上的缺陷已被认为是不安全的，但它仍然在一些场景下被使用。本文将指导你如何在Windows命令提示符（CMD）中计算和验证MD5值。

什么是MD5？

MD5是一种将任意长度的数据转换为128位散列值的算法。由于其设计简单，MD5被广泛用于数据完整性校验和密码存储。然而，MD5的碰撞攻击风险较高，即两个不同的输入可能产生相同的MD5散列值。

在CMD中计算MD5值

要在CMD中计算文件的MD5值，你可以使用Windows内置的certutil工具。以下是步骤：

1. 打开CMD。
2. 使用以下命令计算指定文件的MD5值：

certutil -hashfile "文件路径" MD5

例如，如果你要计算名为example.txt的文件的MD5值，命令如下：

certutil -hashfile "C:\path\to\example.txt" MD5

这将输出文件的MD5散列值。

验证MD5值

验证MD5值通常用于确保下载的文件在传输过程中未被篡改。以下是步骤：

1. 使用上述方法计算文件的MD5值。
2. 将计算出的MD5值与提供者提供的MD5值进行比较。

如果两个值相同，则文件未被篡改。以下是一个简单的示例：

”`bash

计算文件的MD5值

certutil -hashfile “C:\path\to\file.zip” MD5

输出的MD5值

8F9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2B9E9C4F2