本文實例講述了C#計算字符串哈希值（MD5、SHA）的方法。分享給大家供大家參考。具體如下：
一、關于本文
本文中是一個類庫，包括下面幾個函數：
① 計算32位MD5碼（大小寫）：Hash_MD5_32
② 計算16位MD5碼（大小寫）：Hash_MD5_16
③ 計算32位2重MD5碼（大小寫）：Hash_2_MD5_32
④ 計算16位2重MD5碼（大小寫）：Hash_2_MD5_16
⑤ 計算SHA-1碼（大小寫）：Hash_SHA_1
⑥ 計算SHA-256碼（大小寫）：Hash_SHA_256
⑦ 計算SHA-384碼（大小寫）：Hash_SHA_384
⑧ 計算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這些函數進行調用
二、類庫中各函數代碼
1. 類庫結構
using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace HashTools{ public class HashHelper { //各個函數 }}2. 計算32位MD5碼（大小寫）：Hash_MD5_32
/// <summary>/// 計算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(); //根據計算得到的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; } //根據大小寫規則決定返回的字符串 return toUpper ? sHash : sHash.ToLower(); } catch (Exception ex) { throw new Exception(ex.Message); }}3. 計算16位MD5碼（大小寫）：Hash_MD5_16
/// <summary>/// 計算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. 計算32位2重MD5碼（大小寫）：Hash_2_MD5_32
/// <summary>/// 計算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); //根據計算得到的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 = ""; //根據計算得到的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; } //根據大小寫規則決定返回的字符串 return toUpper ? sHash : sHash.ToLower(); } catch (Exception ex) { throw new Exception(ex.Message); }}5. 計算16位2重MD5碼（大小寫）：Hash_2_MD5_16
/// <summary>/// 計算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); //根據計算得到的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 = ""; //根據計算得到的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); //根據大小寫規則決定返回的字符串 return toUpper ? sHash : sHash.ToLower(); } catch (Exception ex) { throw new Exception(ex.Message); }}6. 計算SHA-1碼（大小寫）：Hash_SHA_1
/// <summary>/// 計算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(); //根據計算得到的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; } //根據大小寫規則決定返回的字符串 return toUpper ? sHash : sHash.ToLower(); } catch (Exception ex) { throw new Exception(ex.Message); }}7. 計算SHA-256碼（大小寫）：Hash_SHA_256
/// <summary>/// 計算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(); //根據計算得到的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; } //根據大小寫規則決定返回的字符串 return toUpper ? sHash : sHash.ToLower(); } catch (Exception ex) { throw new Exception(ex.Message); }}8. 計算SHA-384碼（大小寫）：Hash_SHA_384
/// <summary>/// 計算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(); //根據計算得到的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; } //根據大小寫規則決定返回的字符串 return toUpper ? sHash : sHash.ToLower(); } catch (Exception ex) { throw new Exception(ex.Message); }}9. 計算SHA-512碼（大小寫）：Hash_SHA_512
/// <summary>/// 計算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(); //根據計算得到的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; } //根據大小寫規則決定返回的字符串 return toUpper ? sHash : sHash.ToLower(); } catch (Exception ex) { throw new Exception(ex.Message); }}三、函數調用
建立項目ComputeHash，添加對HashTools.dll庫的引用。并添加代碼：
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();}運行結果如下：
希望本文所述對大家的C#程序設計有所幫助。
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