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An insecure key derivation function is used.
The iterations of an algorithm during an encryption are very relevant for the safety of encrypted data.
Some cryptography algorithms are nowadays considered as outdated and unsafe or actually broken, since they are too easy to decode. This checker identifies uses of unsafe algorithms for cryptography.
| Class Name | Insecure Key Derivation (C#) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Significance | security | |||||||||
| Mnemonic | CSHARP.CRYPTO.KEY | |||||||||
| Categories |
|
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| Availability | Available for C# only. |
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| Enabling | Checks for this warning class are enabled by
default. To disable them, add the following WARNING_FILTER rule to the
project configuration file.
WARNING_FILTER += discard class="Insecure Key Derivation (C#)" |
Japanese (ja)
using System;
using System.Security.Cryptography;
using System.Text;
namespace DocumentationExample
{
class OtherCryptographyExamples
{
static void Main(string[] args)
{
Console.WriteLine("Enter a password to produce a key:");
byte[] pwd = Encoding.Unicode.GetBytes(Console.ReadLine());
byte[] salt = new byte[6];
RNGCryptoServiceProvider rand = new RNGCryptoServiceProvider();
rand.GetBytes(salt);
AesCryptoServiceProvider aes = new AesCryptoServiceProvider();
try
{
PasswordDeriveBytes pdb = new PasswordDeriveBytes(pwd, salt); // Two warnings issued here:
// - Insecure Key Derivation (C#)
// because PasswordDeriveBytes() is deprecated in favor of Rfc2898DeriveBytes().
// - Inadequate Salt (C#)
// because 'salt' is only 6 bytes.
// Create the key and set it to the Key property
// of the AesCryptoServiceProvider object.
aes.Key = pdb.CryptDeriveKey("Aes", "SHA256", 192, aes.IV);
// ...
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
}
}
}
Use a safer key derivation function.
The following configuration file parameters affect checks for this warning class.