C#計(jì)算字符串哈希值（MD5、SHA）的方法小結(jié)

更新時(shí)間：2015年08月18日 15:18:34 作者：北風(fēng)其涼

這篇文章主要介紹了C#計(jì)算字符串哈希值（MD5、SHA）的方法,以實(shí)例形式較為詳細(xì)的分析總結(jié)了C#計(jì)算字符串哈希值的各種常用技巧,具有一定參考借鑒價(jià)值,需要的朋友可以參考下

本文實(shí)例講述了C#計(jì)算字符串哈希值（MD5、SHA）的方法。分享給大家供大家參考。具體如下：

一、關(guān)于本文

本文中是一個(gè)類庫，包括下面幾個(gè)函數(shù)：

① 計(jì)算32位MD5碼（大小寫）：Hash_MD5_32

② 計(jì)算16位MD5碼（大小寫）：Hash_MD5_16

③ 計(jì)算32位2重MD5碼（大小寫）：Hash_2_MD5_32

④ 計(jì)算16位2重MD5碼（大小寫）：Hash_2_MD5_16

⑤ 計(jì)算SHA-1碼（大小寫）：Hash_SHA_1

⑥ 計(jì)算SHA-256碼（大小寫）：Hash_SHA_256

⑦ 計(jì)算SHA-384碼（大小寫）：Hash_SHA_384

⑧ 計(jì)算SHA-512碼（大小寫）：Hash_SHA_512

編譯后被打包成文件HashTools.dll，其他程序可以在添加引用后對(duì)這些函數(shù)進(jìn)行調(diào)用

二、類庫中各函數(shù)代碼

1. 類庫結(jié)構(gòu)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace HashTools
{
 public class HashHelper
 {
  //各個(gè)函數(shù)
 }
}

2. 計(jì)算32位MD5碼（大小寫）：Hash_MD5_32

/// <summary>
/// 計(jì)算32位MD5碼
/// </summary>
/// <param name="word">字符串</param>
/// <param name="toUpper">返回哈希值格式 true：英文大寫，false：英文小寫</param>
/// <returns></returns>
public static string Hash_MD5_32(string word, bool toUpper = true)
{
 try
 {
  System.Security.Cryptography.MD5CryptoServiceProvider MD5CSP
   = new System.Security.Cryptography.MD5CryptoServiceProvider();
  byte[] bytValue = System.Text.Encoding.UTF8.GetBytes(word);
  byte[] bytHash = MD5CSP.ComputeHash(bytValue);
  MD5CSP.Clear();
  //根據(jù)計(jì)算得到的Hash碼翻譯為MD5碼
  string sHash = "", sTemp = "";
  for (int counter = 0; counter < bytHash.Count(); counter++)
  {
   long i = bytHash[counter] / 16;
   if (i > 9)
   {
    sTemp = ((char)(i - 10 + 0x41)).ToString();
   }
   else
   {
    sTemp = ((char)(i + 0x30)).ToString();
   }
   i = bytHash[counter] % 16;
   if (i > 9)
   {
    sTemp += ((char)(i - 10 + 0x41)).ToString();
   }
   else
   {
    sTemp += ((char)(i + 0x30)).ToString();
   }
   sHash += sTemp;
  }
  //根據(jù)大小寫規(guī)則決定返回的字符串
  return toUpper ? sHash : sHash.ToLower();
 }
 catch (Exception ex)
 {
  throw new Exception(ex.Message);
 }
}

3. 計(jì)算16位MD5碼（大小寫）：Hash_MD5_16

/// <summary>
/// 計(jì)算16位MD5碼
/// </summary>
/// <param name="word">字符串</param>
/// <param name="toUpper">返回哈希值格式 true：英文大寫，false：英文小寫</param>
/// <returns></returns>
public static string Hash_MD5_16(string word, bool toUpper = true)
{
 try
 {
  string sHash = Hash_MD5_32(word).Substring(8, 16);
  return toUpper ? sHash : sHash.ToLower();
 }
 catch (Exception ex)
 {
  throw new Exception(ex.Message);
 }
}

4. 計(jì)算32位2重MD5碼（大小寫）：Hash_2_MD5_32

/// <summary>
/// 計(jì)算32位2重MD5碼
/// </summary>
/// <param name="word">字符串</param>
/// <param name="toUpper">返回哈希值格式 true：英文大寫，false：英文小寫</param>
/// <returns></returns>
public static string Hash_2_MD5_32(string word, bool toUpper = true)
{
 try
 {
  System.Security.Cryptography.MD5CryptoServiceProvider MD5CSP
   = new System.Security.Cryptography.MD5CryptoServiceProvider();
  byte[] bytValue = System.Text.Encoding.UTF8.GetBytes(word);
  byte[] bytHash = MD5CSP.ComputeHash(bytValue);
  //根據(jù)計(jì)算得到的Hash碼翻譯為MD5碼
  string sHash = "", sTemp = "";
  for (int counter = 0; counter < bytHash.Count(); counter++)
  {
   long i = bytHash[counter] / 16;
   if (i > 9)
   {
    sTemp = ((char)(i - 10 + 0x41)).ToString();
   }
   else
   {
    sTemp = ((char)(i + 0x30)).ToString();
   }
   i = bytHash[counter] % 16;
   if (i > 9)
   {
    sTemp += ((char)(i - 10 + 0x41)).ToString();
   }
   else
   {
    sTemp += ((char)(i + 0x30)).ToString();
   }
   sHash += sTemp;
  }
  bytValue = System.Text.Encoding.UTF8.GetBytes(sHash);
  bytHash = MD5CSP.ComputeHash(bytValue);
  MD5CSP.Clear();
  sHash = "";
  //根據(jù)計(jì)算得到的Hash碼翻譯為MD5碼
  for (int counter = 0; counter < bytHash.Count(); counter++)
  {
   long i = bytHash[counter] / 16;
   if (i > 9)
   {
    sTemp = ((char)(i - 10 + 0x41)).ToString();
   }
   else
   {
    sTemp = ((char)(i + 0x30)).ToString();
   }
   i = bytHash[counter] % 16;
   if (i > 9)
   {
    sTemp += ((char)(i - 10 + 0x41)).ToString();
   }
   else
   {
    sTemp += ((char)(i + 0x30)).ToString();
   }
   sHash += sTemp;
  }
  //根據(jù)大小寫規(guī)則決定返回的字符串
  return toUpper ? sHash : sHash.ToLower();
 }
 catch (Exception ex)
 {
  throw new Exception(ex.Message);
 }
}

5. 計(jì)算16位2重MD5碼（大小寫）：Hash_2_MD5_16

/// <summary>
/// 計(jì)算16位2重MD5碼
/// </summary>
/// <param name="word">字符串</param>
/// <param name="toUpper">返回哈希值格式 true：英文大寫，false：英文小寫</param>
/// <returns></returns>
public static string Hash_2_MD5_16(string word, bool toUpper = true)
{
 try
 {
  System.Security.Cryptography.MD5CryptoServiceProvider MD5CSP
    = new System.Security.Cryptography.MD5CryptoServiceProvider();
  byte[] bytValue = System.Text.Encoding.UTF8.GetBytes(word);
  byte[] bytHash = MD5CSP.ComputeHash(bytValue);
  //根據(jù)計(jì)算得到的Hash碼翻譯為MD5碼
  string sHash = "", sTemp = "";
  for (int counter = 0; counter < bytHash.Count(); counter++)
  {
   long i = bytHash[counter] / 16;
   if (i > 9)
   {
    sTemp = ((char)(i - 10 + 0x41)).ToString();
   }
   else
   {
    sTemp = ((char)(i + 0x30)).ToString();
   }
   i = bytHash[counter] % 16;
   if (i > 9)
   {
    sTemp += ((char)(i - 10 + 0x41)).ToString();
   }
   else
   {
    sTemp += ((char)(i + 0x30)).ToString();
   }
   sHash += sTemp;
  }
  sHash = sHash.Substring(8, 16);
  bytValue = System.Text.Encoding.UTF8.GetBytes(sHash);
  bytHash = MD5CSP.ComputeHash(bytValue);
  MD5CSP.Clear();
  sHash = "";
  //根據(jù)計(jì)算得到的Hash碼翻譯為MD5碼
  for (int counter = 0; counter < bytHash.Count(); counter++)
  {
   long i = bytHash[counter] / 16;
   if (i > 9)
   {
    sTemp = ((char)(i - 10 + 0x41)).ToString();
   }
   else
   {
    sTemp = ((char)(i + 0x30)).ToString();
   }
   i = bytHash[counter] % 16;
   if (i > 9)
   {
    sTemp += ((char)(i - 10 + 0x41)).ToString();
   }
   else
   {
    sTemp += ((char)(i + 0x30)).ToString();
   }
   sHash += sTemp;
  }
  sHash = sHash.Substring(8, 16);
  //根據(jù)大小寫規(guī)則決定返回的字符串
  return toUpper ? sHash : sHash.ToLower();
 }
 catch (Exception ex)
 {
  throw new Exception(ex.Message);
 }
}

6. 計(jì)算SHA-1碼（大小寫）：Hash_SHA_1

/// <summary>
/// 計(jì)算SHA-1碼
/// </summary>
/// <param name="word">字符串</param>
/// <param name="toUpper">返回哈希值格式 true：英文大寫，false：英文小寫</param>
/// <returns></returns>
public static string Hash_SHA_1(string word, bool toUpper = true)
{
 try
 {
  System.Security.Cryptography.SHA1CryptoServiceProvider SHA1CSP
   = new System.Security.Cryptography.SHA1CryptoServiceProvider();
  byte[] bytValue = System.Text.Encoding.UTF8.GetBytes(word);
  byte[] bytHash = SHA1CSP.ComputeHash(bytValue);
  SHA1CSP.Clear();
  //根據(jù)計(jì)算得到的Hash碼翻譯為SHA-1碼
  string sHash = "", sTemp = "";
  for (int counter = 0; counter < bytHash.Count(); counter++)
  {
   long i = bytHash[counter] / 16;
   if (i > 9)
   {
    sTemp = ((char)(i - 10 + 0x41)).ToString();
   }
   else
   {
    sTemp = ((char)(i + 0x30)).ToString();
   }
   i = bytHash[counter] % 16;
   if (i > 9)
   {
    sTemp += ((char)(i - 10 + 0x41)).ToString();
   }
   else
   {
    sTemp += ((char)(i + 0x30)).ToString();
   }
   sHash += sTemp;
  }
  //根據(jù)大小寫規(guī)則決定返回的字符串
  return toUpper ? sHash : sHash.ToLower();
 }
 catch (Exception ex)
 {
  throw new Exception(ex.Message);
 }
}

7. 計(jì)算SHA-256碼（大小寫）：Hash_SHA_256

/// <summary>
/// 計(jì)算SHA-256碼
/// </summary>
/// <param name="word">字符串</param>
/// <param name="toUpper">返回哈希值格式 true：英文大寫，false：英文小寫</param>
/// <returns></returns>
public static string Hash_SHA_256(string word, bool toUpper = true)
{
 try
 {
  System.Security.Cryptography.SHA256CryptoServiceProvider SHA256CSP
   = new System.Security.Cryptography.SHA256CryptoServiceProvider();
  byte[] bytValue = System.Text.Encoding.UTF8.GetBytes(word);
  byte[] bytHash = SHA256CSP.ComputeHash(bytValue);
  SHA256CSP.Clear();
  //根據(jù)計(jì)算得到的Hash碼翻譯為SHA-1碼
  string sHash = "", sTemp = "";
  for (int counter = 0; counter < bytHash.Count(); counter++)
  {
   long i = bytHash[counter] / 16;
   if (i > 9)
   {
    sTemp = ((char)(i - 10 + 0x41)).ToString();
   }
   else
   {
    sTemp = ((char)(i + 0x30)).ToString();
   }
   i = bytHash[counter] % 16;
   if (i > 9)
   {
    sTemp += ((char)(i - 10 + 0x41)).ToString();
   }
   else
   {
    sTemp += ((char)(i + 0x30)).ToString();
   }
   sHash += sTemp;
  }
  //根據(jù)大小寫規(guī)則決定返回的字符串
  return toUpper ? sHash : sHash.ToLower();
 }
 catch (Exception ex)
 {
  throw new Exception(ex.Message);
 }
}

8. 計(jì)算SHA-384碼（大小寫）：Hash_SHA_384

/// <summary>
/// 計(jì)算SHA-384碼
/// </summary>
/// <param name="word">字符串</param>
/// <param name="toUpper">返回哈希值格式 true：英文大寫，false：英文小寫</param>
/// <returns></returns>
public static string Hash_SHA_384(string word, bool toUpper = true)
{
 try
 {
  System.Security.Cryptography.SHA384CryptoServiceProvider SHA384CSP
   = new System.Security.Cryptography.SHA384CryptoServiceProvider();
  byte[] bytValue = System.Text.Encoding.UTF8.GetBytes(word);
  byte[] bytHash = SHA384CSP.ComputeHash(bytValue);
  SHA384CSP.Clear();
  //根據(jù)計(jì)算得到的Hash碼翻譯為SHA-1碼
  string sHash = "", sTemp = "";
  for (int counter = 0; counter < bytHash.Count(); counter++)
  {
   long i = bytHash[counter] / 16;
   if (i > 9)
   {
    sTemp = ((char)(i - 10 + 0x41)).ToString();
   }
   else
   {
    sTemp = ((char)(i + 0x30)).ToString();
   }
   i = bytHash[counter] % 16;
   if (i > 9)
   {
    sTemp += ((char)(i - 10 + 0x41)).ToString();
   }
   else
   {
    sTemp += ((char)(i + 0x30)).ToString();
   }
   sHash += sTemp;
  }
  //根據(jù)大小寫規(guī)則決定返回的字符串
  return toUpper ? sHash : sHash.ToLower();
 }
 catch (Exception ex)
 {
  throw new Exception(ex.Message);
 }
}

9. 計(jì)算SHA-512碼（大小寫）：Hash_SHA_512

/// <summary>
/// 計(jì)算SHA-512碼
/// </summary>
/// <param name="word">字符串</param>
/// <param name="toUpper">返回哈希值格式 true：英文大寫，false：英文小寫</param>
/// <returns></returns>
public static string Hash_SHA_512(string word, bool toUpper = true)
{
 try
 {
  System.Security.Cryptography.SHA512CryptoServiceProvider SHA512CSP
   = new System.Security.Cryptography.SHA512CryptoServiceProvider();
  byte[] bytValue = System.Text.Encoding.UTF8.GetBytes(word);
  byte[] bytHash = SHA512CSP.ComputeHash(bytValue);
  SHA512CSP.Clear();
  //根據(jù)計(jì)算得到的Hash碼翻譯為SHA-1碼
  string sHash = "", sTemp = "";
  for (int counter = 0; counter < bytHash.Count(); counter++)
  {
   long i = bytHash[counter] / 16;
   if (i > 9)
   {
    sTemp = ((char)(i - 10 + 0x41)).ToString();
   }
   else
   {
    sTemp = ((char)(i + 0x30)).ToString();
   }
   i = bytHash[counter] % 16;
   if (i > 9)
   {
    sTemp += ((char)(i - 10 + 0x41)).ToString();
   }
   else
   {
    sTemp += ((char)(i + 0x30)).ToString();
   }
   sHash += sTemp;
  }
  //根據(jù)大小寫規(guī)則決定返回的字符串
  return toUpper ? sHash : sHash.ToLower();
 }
 catch (Exception ex)
 {
  throw new Exception(ex.Message);
 }
}

三、函數(shù)調(diào)用

建立項(xiàng)目ComputeHash，添加對(duì)HashTools.dll庫的引用。并添加代碼：

復(fù)制代碼代碼如下:

using HashTools;

然后在Main函數(shù)中添加下列代碼：

static void Main(string[] args)
{
 Console.WriteLine("MD5 of \"abc\"");
 Console.WriteLine("MD5_32(Upper): {0}", 
  HashHelper.Hash_MD5_32("abc"));
 Console.WriteLine("MD5_32(Lower): {0}",
  HashHelper.Hash_MD5_32("abc", false));
 Console.WriteLine("MD5_16(Upper): {0}",
  HashHelper.Hash_MD5_16("abc"));
 Console.WriteLine("MD5_16(Lower): {0}",
  HashHelper.Hash_MD5_16("abc", false));
 Console.WriteLine("2_MD5_32(Upper): {0}", 
  HashHelper.Hash_2_MD5_32("abc"));
 Console.WriteLine("2_MD5_32(Lower): {0}", 
  HashHelper.Hash_2_MD5_32("abc", false));
 Console.WriteLine("2_MD5_32(Upper): {0}", 
  HashHelper.Hash_2_MD5_16("abc"));
 Console.WriteLine("2_MD5_32(Lower): {0}", 
  HashHelper.Hash_2_MD5_16("abc", false));
 Console.WriteLine("SHA of \"abc\"");
 Console.WriteLine("SHA-1(Upper): {0}", 
  HashHelper.Hash_SHA_1("abc"));
 Console.WriteLine("SHA-1(Lower): {0}", 
  HashHelper.Hash_SHA_1("abc", false));
 Console.WriteLine("SHA-256(Upper): {0}",
  HashHelper.Hash_SHA_256("abc"));
 Console.WriteLine("SHA-256(Lower): {0}",
  HashHelper.Hash_SHA_256("abc", false));
 Console.WriteLine("SHA-384(Upper): {0}",
  HashHelper.Hash_SHA_384("abc"));
 Console.WriteLine("SHA-384(Lower): {0}",
  HashHelper.Hash_SHA_384("abc", false));
 Console.WriteLine("SHA-512(Upper): {0}", 
  HashHelper.Hash_SHA_512("abc"));
 Console.WriteLine("SHA-512(Lower): {0}", 
  HashHelper.Hash_SHA_512("abc", false));
 Console.ReadLine();
}

運(yùn)行結(jié)果如下：