C#计算字符串哈希值（MD5、SHA）的⽅法⼩结本⽂实例讲述了C#计算字符串哈希值（MD5、SHA）的⽅法。分享给⼤家供⼤家参考。具体如下：
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
1. 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
}
}
2. 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);
}
}
3. 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);
}
}
4. 计算32位2重MD5码（⼤⼩写）：Hash_2_MD5_32
/// <summary>
正则匹配哈希值/// 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);
}
}
5. 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);
}
}
6. 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);
}
}
7. 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);
}
}
8. 计算SHA-384码（⼤⼩写）：Hash_SHA_384
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