如何在使用 crypto c# 4.0 时生成相同的密钥

发布于 2024-10-05 03:21:55 字数 515 浏览 4 评论 0原文

嗨，我正在尝试加密和解密字符串值...我通过使用手动密钥来实现它，例如...

private static byte[] _salt = Encoding.ASCII.GetBytes("123456789abcdefg");

并且我创建了密钥和 iv 之类的

Rfc2898DeriveBytes rfcDeriveBytes = new Rfc2898DeriveBytes(password, _salt);
rijndaelManaged = new RijndaelManaged();
rijndaelManaged.Key = rfcDeriveBytes.GetBytes(rijndaelManaged.KeySize / 8);
rijndaelManaged.IV = rfcDeriveBytes.GetBytes(rijndaelManaged.BlockSize / 8);

，但我想动态生成相同的密钥...我的意思是如何动态生成 _salt 。 ..

原文

hi im trying to encrypt and decrypt string value... i made it by using manual key like...

private static byte[] _salt = Encoding.ASCII.GetBytes("123456789abcdefg");

and i created key and iv like

Rfc2898DeriveBytes rfcDeriveBytes = new Rfc2898DeriveBytes(password, _salt);
rijndaelManaged = new RijndaelManaged();
rijndaelManaged.Key = rfcDeriveBytes.GetBytes(rijndaelManaged.KeySize / 8);
rijndaelManaged.IV = rfcDeriveBytes.GetBytes(rijndaelManaged.BlockSize / 8);

but i wanna generate the same key dynamically... i mean how can i generate _salt dynamically...

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深者入戏 2024-10-12 03:21:55

Rfc2898DeriveBytes类可以为您生成随机盐 - 只需将所需的盐大小传递给适当的构造函数。并且不要忘记将生成的盐存储在安全的地方 - 它无法确定性地重新生成，并且没有它，您将无法重新创建密钥和 IV 进行解密。

string password = GetPasswordFromUserInputOrWherever();

using (var deriveBytes = new Rfc2898DeriveBytes(password, 16))  // 16 byte salt
{
    byte[] salt = deriveBytes.Salt;

    // now save the salt somewhere safe
    // you'll need it to generate the same byte sequence when decrypting

    using (var rijndael = new RijndaelManaged())
    {
        rijndael.Key = deriveBytes.GetBytes(rijndael.KeySize / 8);
        rijndael.IV = deriveBytes.GetBytes(rijndael.BlockSize / 8);

        // encrypt...
    }
}

然后解密：

string password = GetPasswordFromUserInputOrWherever();
byte[] salt = GetSaltFromWhereverYouPreviouslySavedIt();

using (var deriveBytes = new Rfc2898DeriveBytes(password, salt))
using (var rijndael = new RijndaelManaged())
{
    rijndael.Key = deriveBytes.GetBytes(rijndael.KeySize / 8);
    rijndael.IV = deriveBytes.GetBytes(rijndael.BlockSize / 8);

    // decrypt...
}

The Rfc2898DeriveBytes class can generate a random salt for you - just pass the required salt size to the appropriate constructor. And don't forget to store the generated salt somewhere safe - it can't be deterministically regenerated, and without it you won't be able to recreate your key and IV for decryption.

string password = GetPasswordFromUserInputOrWherever();

using (var deriveBytes = new Rfc2898DeriveBytes(password, 16))  // 16 byte salt
{
    byte[] salt = deriveBytes.Salt;

    // now save the salt somewhere safe
    // you'll need it to generate the same byte sequence when decrypting

    using (var rijndael = new RijndaelManaged())
    {
        rijndael.Key = deriveBytes.GetBytes(rijndael.KeySize / 8);
        rijndael.IV = deriveBytes.GetBytes(rijndael.BlockSize / 8);

        // encrypt...
    }
}

And then to decrypt:

string password = GetPasswordFromUserInputOrWherever();
byte[] salt = GetSaltFromWhereverYouPreviouslySavedIt();

using (var deriveBytes = new Rfc2898DeriveBytes(password, salt))
using (var rijndael = new RijndaelManaged())
{
    rijndael.Key = deriveBytes.GetBytes(rijndael.KeySize / 8);
    rijndael.IV = deriveBytes.GetBytes(rijndael.BlockSize / 8);

    // decrypt...
}

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