using System.Security.Cryptography;
 
public class SecurityVault
{
    public static bool SecureCompare(byte[] a, byte[] b)
    {
        // Prevents timing attacks by ensuring comparison time is constant
        // regardless of where the first mismatch occurs.
        return CryptographicOperations.FixedTimeEquals(a, b);
    }
 
    public static bool ManualFixedTimeCompare(ReadOnlySpan<byte> left, ReadOnlySpan<byte> right)
    {
        if (left.Length != right.Length) return false;
        int accumulator = 0;
        for (int i = 0; i < left.Length; i++)
        {
            accumulator |= left[i] ^ right[i];
        }
        return accumulator == 0;
    }
}