/* decrypt-verify.c - Decrypt and verify function.

   Copyright (C) 2000 Werner Koch (dd9jn)

   Copyright (C) 2001, 2002, 2003, 2004 g10 Code GmbH

   This file is part of GPGME.

   GPGME is free software; you can redistribute it and/or modify it

   under the terms of the GNU Lesser General Public License as

   published by the Free Software Foundation; either version 2.1 of

   the License, or (at your option) any later version.

   GPGME is distributed in the hope that it will be useful, but

   WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with this program; if not, write to the Free Software

   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA

   02111-1307, USA.  */

#if HAVE_CONFIG_H

#include <config.h>

#endif

#include <assert.h>

#include "debug.h"

#include "gpgme.h"

#include "ops.h"

static gpgme_error_t

decrypt_verify_status_handler (void *priv, gpgme_status_code_t code,

			       char *args)

{

  gpgme_error_t err;

  err = _gpgme_progress_status_handler (priv, code, args);

  if (!err)

    err = _gpgme_decrypt_status_handler (priv, code, args);

  if (!err)

      err = _gpgme_verify_status_handler (priv, code, args);

  return err;

}

static gpgme_error_t

decrypt_verify_start (gpgme_ctx_t ctx, int synchronous,

                      gpgme_decrypt_flags_t flags,

		      gpgme_data_t cipher, gpgme_data_t plain)

{

  gpgme_error_t err;

  assert ((flags & GPGME_DECRYPT_VERIFY));

  err = _gpgme_op_reset (ctx, synchronous);

  if (err)

    return err;

  err = _gpgme_op_decrypt_init_result (ctx);

  if (err)

    return err;

  err = _gpgme_op_verify_init_result (ctx);

  if (err)

    return err;

  if (!cipher)

    return gpg_error (GPG_ERR_NO_DATA);

  if (!plain)

    return gpg_error (GPG_ERR_INV_VALUE);

  if (ctx->passphrase_cb)

    {

      err = _gpgme_engine_set_command_handler

	(ctx->engine, _gpgme_passphrase_command_handler, ctx, NULL);

      if (err)

	return err;

    }

  _gpgme_engine_set_status_handler (ctx->engine,

				    decrypt_verify_status_handler, ctx);

  return _gpgme_engine_op_decrypt (ctx->engine,

                                   flags,

                                   cipher, plain,

                                   ctx->export_session_keys,

                                   ctx->override_session_key,

                                   ctx->auto_key_retrieve);

}

/* Decrypt ciphertext CIPHER and make a signature verification within

   CTX and store the resulting plaintext in PLAIN.  */

gpgme_error_t

gpgme_op_decrypt_verify_start (gpgme_ctx_t ctx, gpgme_data_t cipher,

			       gpgme_data_t plain)

{

  gpgme_error_t err;

  TRACE_BEG2 (DEBUG_CTX, "gpgme_op_decrypt_verify_start", ctx,

	      "cipher=%p, plain=%p", cipher, plain);

  if (!ctx)

    return TRACE_ERR (gpg_error (GPG_ERR_INV_VALUE));

  err = decrypt_verify_start (ctx, 0, GPGME_DECRYPT_VERIFY, cipher, plain);

  return TRACE_ERR (err);

}

/* Decrypt ciphertext CIPHER and make a signature verification within

   CTX and store the resulting plaintext in PLAIN.  */

gpgme_error_t

gpgme_op_decrypt_verify (gpgme_ctx_t ctx, gpgme_data_t cipher,

			 gpgme_data_t plain)

{

  gpgme_error_t err;

  TRACE_BEG2 (DEBUG_CTX, "gpgme_op_decrypt_verify", ctx,

	      "cipher=%p, plain=%p", cipher, plain);

  if (!ctx)

    return TRACE_ERR (gpg_error (GPG_ERR_INV_VALUE));

  err = decrypt_verify_start (ctx, 1, GPGME_DECRYPT_VERIFY, cipher, plain);

  if (!err)

    err = _gpgme_wait_one (ctx);

  return TRACE_ERR (err);

}

/* Decrypt ciphertext CIPHER within CTX and store the resulting

   plaintext in PLAIN.  */

gpgme_error_t

gpgme_op_decrypt_ext_start (gpgme_ctx_t ctx,

                            gpgme_decrypt_flags_t flags,

                            gpgme_data_t cipher,

                            gpgme_data_t plain)

{

  gpgme_error_t err;

  TRACE_BEG2 (DEBUG_CTX, "gpgme_op_decrypt_ext_start", ctx,

	      "cipher=%p, plain=%p", cipher, plain);

  if (!ctx)

    return TRACE_ERR (gpg_error (GPG_ERR_INV_VALUE));

  if ((flags & GPGME_DECRYPT_VERIFY))

    err = decrypt_verify_start (ctx, 0, flags, cipher, plain);

  else

    err = _gpgme_decrypt_start (ctx, 0, flags, cipher, plain);

  return TRACE_ERR (err);

}

/* Decrypt ciphertext CIPHER within CTX and store the resulting

   plaintext in PLAIN.  */

gpgme_error_t

gpgme_op_decrypt_ext (gpgme_ctx_t ctx,

                      gpgme_decrypt_flags_t flags,

                      gpgme_data_t cipher,

                      gpgme_data_t plain)

{

  gpgme_error_t err;

  TRACE_BEG2 (DEBUG_CTX, "gpgme_op_decrypt_ext", ctx,

	      "cipher=%p, plain=%p", cipher, plain);

  if (!ctx)

    return TRACE_ERR (gpg_error (GPG_ERR_INV_VALUE));

  if ((flags & GPGME_DECRYPT_VERIFY))

    err = decrypt_verify_start (ctx, 1, flags, cipher, plain);

  else

    err = _gpgme_decrypt_start (ctx, 1, flags, cipher, plain);

  if (!err)

    err = _gpgme_wait_one (ctx);

  return TRACE_ERR (err);

}