/// <summary>
/// Attempts to decrypt the contents of a data buffer.
/// If required, the user will be prompted for a password using the default pinentry program.
/// </summary>
/// <param name="cipher">A DataBuffer containing the data to be decrypted.</param>
/// <returns>A DataBuffer containing the decrypted data.</returns>
public GpgBuffer Decrypt(GpgBuffer cipher)
{
var output = MemoryGpgBuffer.Create();
ErrorHandler.Check(GpgMeWrapper.gpgme_op_decrypt(Handle, cipher.Handle, output.Handle));
output.Position = 0;
return(output);
}
/// <summary>
/// Decrypts a file and returns its contents.
/// </summary>
/// <param name="context">The <see cref="GpgContext"/> to operate on.</param>
/// <param name="inputFilePath">The path to the encrypted file.</param>
public static string DecryptFile(this GpgContext context, string inputFilePath)
{
using (var cipher = MemoryGpgBuffer.CreateFromFile(inputFilePath))
using (var reader = new StreamReader(context.Decrypt(cipher)))
{
return(reader.ReadToEnd());
}
}
/// <summary>
/// Encrypts a file and writes the ciphertext to another file.
/// </summary>
/// <param name="context">The <see cref="GpgContext"/> to operate on.</param>
/// <param name="inputFilePath">The path to the unencrypted file.</param>
/// <param name="outputFilePath">The path where the encrypted file should be saved.</param>
/// <param name="encryptFlags">The encryption flags to be used.</param>
/// <param name="overwrite">Whether the existing file should be overwritten if a file already exists at <paramref name="outputFilePath"/>.</param>
/// <param name="recipients">The GPG keys for which the data should be encrypted.</param>
public static void EncryptFile(this GpgContext context, string inputFilePath, string outputFilePath, IEnumerable <GpgKey> recipients, EncryptFlags encryptFlags = EncryptFlags.None, bool overwrite = false)
{
using (var file = File.Open(outputFilePath, overwrite ? FileMode.Create : FileMode.CreateNew))
using (var plain = MemoryGpgBuffer.CreateFromFile(inputFilePath))
using (var cipher = context.Encrypt(plain, recipients, encryptFlags))
{
cipher.CopyTo(file);
}
}
/// <summary>
/// Decrypts a file and writes its decrypted content to another file.
/// </summary>
/// <param name="context">The <see cref="GpgContext"/> to operate on.</param>
/// <param name="inputFilePath">The path to the encrypted file.</param>
/// <param name="outputFilePath">The path where the decrypted file should be saved.</param>
/// <param name="overwrite">Whether the existing file should be overwritten if a file already exists at <paramref name="outputFilePath"/>.</param>
public static void DecryptFile(this GpgContext context, string inputFilePath, string outputFilePath, bool overwrite = false)
{
using (var file = File.Open(outputFilePath, overwrite ? FileMode.Create : FileMode.CreateNew))
using (var cipher = MemoryGpgBuffer.CreateFromFile(inputFilePath))
using (var plain = context.Decrypt(cipher))
{
plain.CopyTo(file);
}
}
/// <summary>
/// Attempts to encrypt the contents of a data buffer for multiple recipients.
/// </summary>
/// <param name="plain">A DataBuffer containing the plaintext data to be encrypted.</param>
/// <param name="recipients">The GPG keys for which the data should be encrypted.</param>
/// <param name="encryptFlags">The encryption flags to be used.</param>
/// <returns>A DataBuffer containing the encrypted data.</returns>
public GpgBuffer Encrypt(GpgBuffer plain, IEnumerable <GpgKey> recipients, EncryptFlags encryptFlags = EncryptFlags.None)
{
// Transform the recipient list into a list of GpgME key handles
var rcpHandles = recipients.Select(rcp => rcp.Handle).ToArray();
var output = MemoryGpgBuffer.Create();
ErrorHandler.Check(GpgMeWrapper.gpgme_op_encrypt(Handle, rcpHandles, encryptFlags, plain.Handle, output.Handle));
output.Position = 0;
return(output);
}
