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using System.Security.Cryptography; //
//MD5加密函数 // public string MD5(String str) { MD5 md5=new MD5CryptoServiceProvider(); byte[] data=System.Text.Encoding.Default.GetBytes(str); byte[] result=md5.ComputeHash(data); String ret=""; for(int i=0;i<result.Length;i++) ret+=result[i].ToString("x").PadLeft(2,'0'); return ret; } MS的HELP
using System;
using System.Security.Cryptography; using System.Text; class Example
{ // Hash an input string and return the hash as // a 32 character hexadecimal string. static string getMd5Hash(string input) { // Create a new instance of the MD5CryptoServiceProvider object. MD5 md5Hasher = MD5.Create(); // Convert the input string to a byte array and compute the hash.
byte[] data = md5Hasher.ComputeHash(Encoding.Default.GetBytes(input)); // Create a new Stringbuilder to collect the bytes
// and create a string. StringBuilder sBuilder = new StringBuilder(); // Loop through each byte of the hashed data
// and format each one as a hexadecimal string. for (int i = 0; i < data.Length; i++) { sBuilder.Append(data[i].ToString("x2")); } // Return the hexadecimal string.
return sBuilder.ToString(); } // Verify a hash against a string.
static bool verifyMd5Hash(string input, string hash) { // Hash the input. string hashOfInput = getMd5Hash(input); // Create a StringComparer an comare the hashes.
StringComparer comparer = StringComparer.OrdinalIgnoreCase; if (0 == comparer.Compare(hashOfInput, hash))
{ return true; } else { return false; } } static void Main() { string source = "Hello World!"; string hash = getMd5Hash(source); Console.WriteLine("The MD5 hash of " + source + " is: " + hash + ".");
Console.WriteLine("Verifying the hash...");
if (verifyMd5Hash(source, hash))
{ Console.WriteLine("The hashes are the same."); } else { Console.WriteLine("The hashes are not same."); } } } // This code example produces the following output: // // The MD5 hash of Hello World! is: ed076287532e86365e841e92bfc50d8c. // Verifying the hash... // The hashes are the same. |
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