C# 计算字符串的哈希值（MD5、SHA）
一、关于本文
本文中是一个类库，包括下面几个函数：
1）计算32位MD5码（大小写）：Hash_MD5_32
2）计算16位MD5码（大小写）：Hash_MD5_16
3）计算32位2重MD5码（大小写）：Hash_2_MD5_32
4）计算16位2重MD5码（大小写）：Hash_2_MD5_16
5）计算SHA-1码（大小写）：Hash_SHA_1
6）计算SHA-256码（大小写）：Hash_SHA_256
7）计算SHA-384码（大小写）：Hash_SHA_384
8）计算SHA-512码（大小写）：Hash_SHA_512
编译后被打包成文件HashTools.dll，其他程序可以在添加引用后对这些函数进行调用
二、类库中各函数代码
0）类库结构
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace HashTools
{
public class HashHelper
{
//各个函数
}
}
1）计算32位MD5码（大小写）：Hash_MD5_32
/// <summary>
/// 计算32位MD5码
/// </summary>
/// <param name="word">字符串</param>
/// <param name="toUpper">返回哈希值格式 true：英文大写，false：英文小写</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();
//根据计算得到的Hash码翻译为MD5码
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;
}
//根据大小写规则决定返回的字符串
return toUpper ? sHash : sHash.ToLower();
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
}
2）计算16位MD5码（大小写）：Hash_MD5_16
/// <summary>
/// 计算16位MD5码
/// </summary>
/// <param name="word">字符串</param>
/// <param name="toUpper">返回哈希值格式 true：英文大写，false：英文小写</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);
}
}
3）计算32位2重MD5码（大小写）：Hash_2_MD5_32
/// <summary>
/// 计算32位2重MD5码
/// </summary>
/// <param name="word">字符串</param>
/// <param name="toUpper">返回哈希值格式 true：英文大写，false：英文小写</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);
//根据计算得到的Hash码翻译为MD5码
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 = "";
//根据计算得到的Hash码翻译为MD5码
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;
}
//根据大小写规则决定返回的字符串
return toUpper ? sHash : sHash.ToLower();
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
}
4）计算16位2重MD5码（大小写）：Hash_2_MD5_16
/// <summary>
/// 计算16位2重MD5码
/// </summary>
/// <param name="word">字符串</param>
/// <param name="toUpper">返回哈希值格式 true：英文大写，false：英文小写</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);
//根据计算得到的Hash码翻译为MD5码
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 = "";
//根据计算得到的Hash码翻译为MD5码
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);
//根据大小写规则决定返回的字符串
return toUpper ? sHash : sHash.ToLower();
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
}
5）计算SHA-1码（大小写）：Hash_SHA_1
/// <summary>
/// 计算SHA-1码
/// </summary>
/// <param name="word">字符串</param>
/// <param name="toUpper">返回哈希值格式 true：英文大写，false：英文小写</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();
//根据计算得到的Hash码翻译为SHA-1码
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;
}
//根据大小写规则决定返回的字符串
return toUpper ? sHash : sHash.ToLower();
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
}
6）计算SHA-256码（大小写）：Hash_SHA_256
/// <summary>
/// 计算SHA-256码
/// </summary>
/// <param name="word">字符串</param>
/// <param name="toUpper">返回哈希值格式 true：英文大写，false：英文小写</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();
//根据计算得到的Hash码翻译为SHA-1码
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;
}
//根据大小写规则决定返回的字符串
return toUpper ? sHash : sHash.ToLower();
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
}
7）计算SHA-384码（大小写）：Hash_SHA_384
/// <summary>
/// 计算SHA-384码
/// </summary>
/// <param name="word">字符串</param>
/// <param name="toUpper">返回哈希值格式 true：英文大写，false：英文小写</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();
//根据计算得到的Hash码翻译为SHA-1码
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;
}
//根据大小写规则决定返回的字符串
return toUpper ? sHash : sHash.ToLower();
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
}
8）计算SHA-512码（大小写）：Hash_SHA_512
/// <summary>
/// 计算SHA-512码
/// </summary>
/// <param name="word">字符串</param>
/// <param name="toUpper">返回哈希值格式 true：英文大写，false：英文小写</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();
//根据计算得到的Hash码翻译为SHA-1码
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;
}
//根据大小写规则决定返回的字符串
return toUpper ? sHash : sHash.ToLower();
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
}
三、函数调用
建立项目ComputeHash，添加对HashTools.dll库的引用。并添加代码：
using HashTools;
然后在Main函数中添加下列代码：
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();
}
运行结果如下：
END