/// <summary>
/// Initializes a new instance of the <see cref="AuthenticatedEncryptionProvider"/> class used for encryption and decryption.
/// </summary>
/// <param name="key">The <see cref="SecurityKey"/> that will be used for crypto operations.</param>
/// <param name="algorithm">The encryption algorithm to apply.</param>
/// <exception cref="ArgumentNullException">'key' is null.</exception>
/// <exception cref="ArgumentNullException">'algorithm' is null or whitespace.</exception>
/// <exception cref="ArgumentOutOfRangeException">key size is not large enough.</exception>
/// <exception cref="ArgumentException">'algorithm' is not supported.</exception>
/// <exception cref="ArgumentException">a symmetricSignatureProvider is not created.</exception>
public AuthenticatedEncryptionProvider(SecurityKey key, string algorithm)
{
if (key == null)
{
throw LogHelper.LogArgumentNullException(nameof(key));
}
if (string.IsNullOrWhiteSpace(algorithm))
{
throw LogHelper.LogArgumentNullException(nameof(algorithm));
}
Key = key;
Algorithm = algorithm;
_cryptoProviderFactory = key.CryptoProviderFactory;
if (SupportedAlgorithms.IsSupportedEncryptionAlgorithm(algorithm, key))
{
if (SupportedAlgorithms.IsAesGcm(algorithm))
{
#if NETSTANDARD2_0
if (!RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
{
throw LogHelper.LogExceptionMessage(new PlatformNotSupportedException(LogHelper.FormatInvariant(LogMessages.IDX10713, LogHelper.MarkAsNonPII(algorithm))));
}
#endif
InitializeUsingAesGcm();
}
else
{
InitializeUsingAesCbc();
}
}
else
{
throw LogHelper.LogExceptionMessage(new ArgumentException(LogHelper.FormatInvariant(LogMessages.IDX10668, LogHelper.MarkAsNonPII(_className), LogHelper.MarkAsNonPII(algorithm), key)));
}
}
/// <summary>
/// Checks if an 'key, algorithm' pair is supported
/// </summary>
/// <param name="key">the <see cref="SecurityKey"/></param>
/// <param name="algorithm">the algorithm to check.</param>
/// <returns>true if 'key, algorithm' pair is supported.</returns>
protected virtual bool IsSupportedAlgorithm(SecurityKey key, string algorithm)
{
return(SupportedAlgorithms.IsSupportedEncryptionAlgorithm(algorithm, key));
}