用C#实现MD5算法

/// <summary>

/// 一个实现MD5散列字符串的类

/// </summary>

public sealed class MD5Hashing

{

private static MD5 md5 = MD5.Create();

//私有化构造函数

private MD5Hashing()

{

}

/// <summary>

/// 使用utf8编码将字符串散列

/// </summary>

/// <param name="sourceString">要散列的字符串</param>

/// <returns>散列后的字符串</returns>

public static string HashString(string sourceString)

{

return HashString(Encoding.UTF8, sourceString);

}

/// <summary>

/// 使用指定的编码将字符串散列

/// </summary>

/// <param name="encode">编码</param>

/// <param name="sourceString">要散列的字符串</param>

/// <returns>散列后的字符串</returns>

public static string HashString(Encoding encode, string sourceString)

{

byte[] source = md5.ComputeHash(encode.GetBytes(sourceString));

StringBuilder sBuilder = new StringBuilder();

for (int i = 0; i < source.Length; i++)

{

sBuilder.Append(source[i].ToString("x2"));

}

return sBuilder.ToString();

}

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