一、計算文件

public?static?string?HashCode(string?str)?

{?

????string?rethash =?"";?

????try?

????{?

?

??????????System.Security.Cryptography.SHA1 hash = System.Security.Cryptography.SHA1.Create();?

???????????System.Text.ASCIIEncoding encoder =?new?System.Text.ASCIIEncoding();?

???????????byte[] combined = encoder.GetBytes(str);?

???????????hash.ComputeHash(combined);?

???????????rethash = Convert.ToBase64String(hash.Hash);?

????}?

????catch?(Exception ex)?

????{?

???????????string?strerr =?"Error in HashCode : "?+ ex.Message;?

????}?

????return?rethash;?

}

?

using?System;

namespace?myMethod

{

????class?computeMD5andSHA1

????{

????????/// <summary>

????????/// 計算文件的 MD5 值

????????/// </summary>

????????/// <param name="fileName">要計算 MD5 值的文件名和路徑</param>

????????/// <returns>MD5 值16進制字符串</returns>

????????public?string?MD5File(string?fileName)

????????{

????????????return?HashFile(fileName ,?"md5");

????????}

?

????????/// <summary>

????????/// 計算文件的 sha1 值

????????/// </summary>

????????/// <param name="fileName">要計算 sha1 值的文件名和路徑</param>

????????/// <returns>sha1 值16進制字符串</returns>

????????public?string?SHA1File(string?fileName)

????????{

????????????return?HashFile(fileName ,?"sha1");

????????}

?

????????/// <summary>

????????/// 計算文件的哈希值

????????/// </summary>

????????/// <param name="fileName">要計算哈希值的文件名和路徑</param>

????????/// <param name="algName">算法:sha1,md5</param>

????????/// <returns>哈希值16進制字符串</returns>

????????private?string?HashFile(string?fileName ,?string?algName)

????????{

????????????if?( !System.IO.File.Exists(fileName) )

????????????????return?string.Empty;

?

????????????System.IO.FileStream fs =?new?System.IO.FileStream(fileName , System.IO.FileMode.Open , System.IO.FileAccess.Read);

????????????byte[] hashBytes = HashData(fs , algName);

????????????fs.Close();

????????????return?ByteArrayToHexString(hashBytes);

????????}

?

????????/// <summary>

????????/// 計算哈希值

????????/// </summary>

????????/// <param name="stream">要計算哈希值的 Stream</param>

????????/// <param name="algName">算法:sha1,md5</param>

????????/// <returns>哈希值字節數組</returns>

????????private?byte[] HashData(System.IO.Stream stream ,?string?algName)

????????{

????????????System.Security.Cryptography.HashAlgorithm algorithm;

????????????if?( algName ==?null?)

????????????{

????????????????throw?new?ArgumentNullException("algName 不能為 null");

????????????}

????????????if?(?string.Compare(algName ,?"sha1"?,?true) == 0 )

????????????{

????????????????algorithm = System.Security.Cryptography.SHA1.Create();

????????????}

????????????else

????????????{

????????????????if?(?string.Compare(algName ,?"md5"?,?true) != 0 )

????????????????{

????????????????????throw?new?Exception("algName 只能使用 sha1 或 md5");

????????????????}

????????????????algorithm = System.Security.Cryptography.MD5.Create();

????????????}

????????????return?algorithm.ComputeHash(stream);

????????}

?

????????/// <summary>

????????/// 字節數組轉換為16進制表示的字符串

????????/// </summary>

????????private?string?ByteArrayToHexString(byte[] buf)

????????{

????????????return?BitConverter.ToString(buf).Replace("-"?,?"");

????????}

????}

}

二、計算文本

///?<summary>??

///?SHA1?加密，返回大寫字符串??

///?</summary>??

///?<param?name="content">需要加密字符串</param>??

///?<returns>返回40位UTF8?大寫</returns>??

public?static?string?SHA1(string?content)??

{??

????return?SHA1(content,?Encoding.UTF8);??

}??

///?<summary>??

///?SHA1?加密，返回大寫字符串??

///?</summary>??

///?<param?name="content">需要加密字符串</param>??

///?<param?name="encode">指定加密編碼</param>??

///?<returns>返回40位大寫字符串</returns>??

public?static?string?SHA1(string?content,?Encoding?encode)??

{??

????try??

????{??

????????SHA1?sha1?=?new?SHA1CryptoServiceProvider();??

????????byte[]?bytes_in?=?encode.GetBytes(content);??

????????byte[]?bytes_out?=?sha1.ComputeHash(bytes_in);??

????????sha1.Dispose();??

????????string?result?=?BitConverter.ToString(bytes_out);??

????????result?=?result.Replace("-",?"");??

????????return?result;??

????}??

????catch?(Exception?ex)??

????{??

????????throw?new?Exception("SHA1加密出錯："?+?ex.Message);??

????}??

}??

三、加密文本

123456789101112131415161718192021222324

class?A{??static?string?GetPwd(string?Pwd)??{????byte[]?data?=?System.Text.Encoding.Default.GetBytes(Pwd);//以字節方式存儲????System.Security.Cryptography.SHA1?sha1?=?new?System.Security.Cryptography.SHA1CryptoServiceProvider();????byte[]?result?=?sha1.ComputeHash(data);//得到哈希值????return?System.BitConverter.ToString(result).Replace("-",?"");?//轉換成為字符串的顯示??}??static?void?Main()??{????string?input?=?"ABCD";????string?Pwd1??=?System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(input,?"SHA1");????System.Console.WriteLine(Pwd1);????string?Pwd2?=?GetPwd(input);????System.Console.WriteLine(Pwd2);??}}/*?程序輸出：FB2F85C88567F3C8CE9B799C7C54642D0C7B41F6FB2F85C88567F3C8CE9B799C7C54642D0C7B41F6*/

總結

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