src/WpfEditor/MD5.cs

using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;

namespace WpfEditor
{
    /// <summary>
    /// MD5哈希计算工具类
    /// </summary>
    public static class MD5
    {
        /// <summary>
        /// 计算字符串的MD5哈希值
        /// </summary>
        /// <param name="input">输入字符串</param>
        /// <returns>MD5哈希值的十六进制字符串表示</returns>
        public static string ComputeHash(string input)
        {
            if (string.IsNullOrEmpty(input))
                return string.Empty;

            using (var md5 = System.Security.Cryptography.MD5.Create())
            {
                byte[] inputBytes = Encoding.UTF8.GetBytes(input);
                byte[] hashBytes = md5.ComputeHash(inputBytes);

                return BitConverter.ToString(hashBytes).Replace("-", "").ToLower();
            }
        }

        /// <summary>
        /// 计算文件的MD5哈希值
        /// </summary>
        /// <param name="filePath">文件路径</param>
        /// <returns>MD5哈希值的十六进制字符串表示</returns>
        /// <exception cref="FileNotFoundException">当文件不存在时抛出</exception>
        public static string ComputeFileHash(string filePath)
        {
            if (!File.Exists(filePath))
                throw new FileNotFoundException("无法找到文件", filePath);

            using (var md5 = System.Security.Cryptography.MD5.Create())
            using (var stream = File.OpenRead(filePath))
            {
                byte[] hashBytes = md5.ComputeHash(stream);
                return BitConverter.ToString(hashBytes).Replace("-", "").ToLower();
            }
        }

        /// <summary>
        /// 验证字符串的MD5哈希值是否匹配
        /// </summary>
        /// <param name="input">输入字符串</param>
        /// <param name="hash">要验证的MD5哈希值</param>
        /// <returns>如果匹配返回true，否则返回false</returns>
        public static bool VerifyHash(string input, string hash)
        {
            string computedHash = ComputeHash(input);
            return string.Equals(computedHash, hash, StringComparison.OrdinalIgnoreCase);
        }

        /// <summary>
        /// 验证文件的MD5哈希值是否匹配
        /// </summary>
        /// <param name="filePath">文件路径</param>
        /// <param name="hash">要验证的MD5哈希值</param>
        /// <returns>如果匹配返回true，否则返回false</returns>
        public static bool VerifyFileHash(string filePath, string hash)
        {
            string computedHash = ComputeFileHash(filePath);
            return string.Equals(computedHash, hash, StringComparison.OrdinalIgnoreCase);
        }
    }
}