Criptografia MD5

MD5:

///

/// Fonte: Help do Microsoft Visual Studio 2008

///

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 <>

{

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.

///

MD5CryptoServiceProvider:

///

/// Fonte: Help do Microsoft Visual Studio 2008

///

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.

MD5CryptoServiceProvider md5Hasher = new MD5CryptoServiceProvider();

// 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 <>

{

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 compare 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.

///

Função Simples: 

public string MD5(string Valor)

{

    return FormsAuthentication.HashPasswordForStoringInConfigFile(Valor, "MD5");            

}