/// <summary>
/// A wrapper around Convert.FromBase64String, with extra validation and relevant exception messages.
/// </summary>
private static byte[] GetKeyFromBase64(string base64, int defaultEncryptionKeySize)
{
if (string.IsNullOrWhiteSpace(base64))
{
throw new ConfigurationErrorsException("The " + Constants.EncryptionKeySetting + " setting must be set to an encryption key. "
+ "The key should be in base 64, and should be at least " + Constants.MinimumAcceptableEncryptionKeyLength
+ " bytes long. You may use EncryptionSettings.GenerateRandomEncryptionKey() to generate a key.\n"
+ "If you'd like, here's a key that was randomly generated:\n"
+ "<add key=\"Raven/Encryption/Key\" value=\""
+ Convert.ToBase64String(EncryptionSettings.GenerateRandomEncryptionKey(defaultEncryptionKeySize))
+ "\" />");
}
try
{
var result = Convert.FromBase64String(base64);
if (result.Length < Constants.MinimumAcceptableEncryptionKeyLength)
{
throw new ConfigurationErrorsException("The " + Constants.EncryptionKeySetting + " setting must be at least "
+ Constants.MinimumAcceptableEncryptionKeyLength + " bytes long.");
}
return(result);
}
catch (FormatException e)
{
throw new ConfigurationErrorsException("The " + Constants.EncryptionKeySetting + " setting has an invalid base 64 value.", e);
}
}
