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Test er #13

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ec725c6
Test er
mm-psy Nov 6, 2025
c072c41
Revert "Test er"
mm-psy Nov 6, 2025
337196a
Test er2
mm-psy Nov 6, 2025
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14 changes: 13 additions & 1 deletion MyProj/Program.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -6,4 +6,16 @@
var myClassInstance = new MyClass { MyInt = 42, MyString = "Hello" };

string myClassJson = JsonConvert.SerializeObject(myClassInstance);
Console.WriteLine("Serialized MyClass JSON: " + myClassJson);
Console.WriteLine("Serialized MyClass JSON: " + myClassJson);

string password = GeneratePassword();
Console.WriteLine("Generated Password: " + password);

string GeneratePassword()
{
// BAD: Password is generated using a cryptographically insecure RNG
Random gen = new Random();
string password = "mypassword" + gen.Next();

Check failure

Code scanning / CodeQL

Insecure randomness High

This uses a cryptographically insecure random number generated at
call to method Next
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in a security context.

Copilot Autofix

AI 8 months ago

To fix this issue, the password should be generated using a cryptographically secure random number generator instead of the insecure System.Random. In C#, the recommended approach is to use System.Security.Cryptography.RNGCryptoServiceProvider (or RandomNumberGenerator since .NET Core). The GeneratePassword function should be updated so that instead of Random.Next(), it uses cryptographically random bytes (via RNGCryptoServiceProvider.GetBytes or RandomNumberGenerator.GetBytes). The password string can then append a securely-generated random integer, by converting securely generated random bytes to an integer. Make sure to add the appropriate using directive (using System.Security.Cryptography;) to the top of the file if not already present.

You only need to modify the GeneratePassword function accordingly, within MyProj/Program.cs.

Suggested changeset 1
MyProj/Program.cs

Autofix patch

Autofix patch
Run the following command in your local git repository to apply this patch
cat << 'EOF' | git apply
diff --git a/MyProj/Program.cs b/MyProj/Program.cs
--- a/MyProj/Program.cs
+++ b/MyProj/Program.cs
@@ -1,5 +1,6 @@
 // See https://aka.ms/new-console-template for more information
 using Newtonsoft.Json; // Add this using directive
+using System.Security.Cryptography;
 
 Console.WriteLine("Hello, World!");
 
@@ -13,9 +14,12 @@
 
 string GeneratePassword()
 {
-    // BAD: Password is generated using a cryptographically insecure RNG
-    Random gen = new Random();
-    string password = "mypassword" + gen.Next();
-
-    return password;
+    // GOOD: Password is generated using a cryptographically secure RNG
+    using (var rng = new System.Security.Cryptography.RNGCryptoServiceProvider())
+    {
+        byte[] randomBytes = new byte[sizeof(int)];
+        rng.GetBytes(randomBytes);
+        string password = "mypassword" + BitConverter.ToInt32(randomBytes, 0);
+        return password;
+    }
 }
\ No newline at end of file
EOF
@@ -1,5 +1,6 @@
// See https://aka.ms/new-console-template for more information
using Newtonsoft.Json; // Add this using directive
using System.Security.Cryptography;

Console.WriteLine("Hello, World!");

@@ -13,9 +14,12 @@

string GeneratePassword()
{
// BAD: Password is generated using a cryptographically insecure RNG
Random gen = new Random();
string password = "mypassword" + gen.Next();

return password;
// GOOD: Password is generated using a cryptographically secure RNG
using (var rng = new System.Security.Cryptography.RNGCryptoServiceProvider())
{
byte[] randomBytes = new byte[sizeof(int)];
rng.GetBytes(randomBytes);
string password = "mypassword" + BitConverter.ToInt32(randomBytes, 0);
return password;
}
}
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Comment on lines +17 to +18

Copilot AI Nov 12, 2025

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Using System.Random for password generation is cryptographically insecure. Replace with System.Security.Cryptography.RandomNumberGenerator to generate cryptographically secure random values for passwords.

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Copilot AI Nov 12, 2025

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The password uses a fixed predictable prefix 'mypassword', making it easily guessable. Use a completely random or hash-based approach instead of appending random numbers to a static string.

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return password;
}

Check warning

Code scanning / Sonarscharp (reported by Codacy)

Add a new line at the end of the file 'Program.cs'. Warning

Add a new line at the end of the file 'Program.cs'.