166 lines
3.8 KiB
C
166 lines
3.8 KiB
C
/* decrypt.c - decrypt functions
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* Copyright (C) 2000 Werner Koch (dd9jn)
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* Copyright (C) 2001, 2002 g10 Code GmbH
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*
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* This file is part of GPGME.
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*
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* GPGME is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* GPGME is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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#include "util.h"
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#include "context.h"
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#include "ops.h"
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struct decrypt_result_s
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{
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int okay;
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int failed;
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};
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void
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_gpgme_release_decrypt_result (DecryptResult result)
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{
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if (!result)
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return;
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xfree (result);
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}
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void
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_gpgme_decrypt_status_handler (GpgmeCtx ctx, GpgStatusCode code, char *args)
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{
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_gpgme_passphrase_status_handler (ctx, code, args);
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if (ctx->error)
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return;
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test_and_allocate_result (ctx, decrypt);
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switch (code)
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{
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case STATUS_EOF:
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if (ctx->result.decrypt->failed)
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ctx->error = mk_error (Decryption_Failed);
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else if (!ctx->result.decrypt->okay)
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ctx->error = mk_error (No_Data);
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break;
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case STATUS_DECRYPTION_OKAY:
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ctx->result.decrypt->okay = 1;
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break;
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case STATUS_DECRYPTION_FAILED:
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ctx->result.decrypt->failed = 1;
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break;
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default:
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/* Ignore all other codes. */
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break;
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}
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}
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GpgmeError
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_gpgme_decrypt_start (GpgmeCtx ctx, GpgmeData ciph, GpgmeData plain,
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void *status_handler)
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{
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GpgmeError err = 0;
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fail_on_pending_request (ctx);
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ctx->pending = 1;
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_gpgme_release_result (ctx);
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/* Create a process object. */
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_gpgme_engine_release (ctx->engine);
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err = _gpgme_engine_new (ctx->use_cms ? GPGME_PROTOCOL_CMS
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: GPGME_PROTOCOL_OpenPGP, &ctx->engine);
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if (err)
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goto leave;
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/* Check the supplied data. */
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if (!ciph || gpgme_data_get_type (ciph) == GPGME_DATA_TYPE_NONE)
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{
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err = mk_error (No_Data);
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goto leave;
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}
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_gpgme_data_set_mode (ciph, GPGME_DATA_MODE_OUT);
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if (gpgme_data_get_type (plain) != GPGME_DATA_TYPE_NONE)
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{
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err = mk_error (Invalid_Value);
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goto leave;
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}
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_gpgme_data_set_mode (plain, GPGME_DATA_MODE_IN);
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err = _gpgme_passphrase_start (ctx);
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if (err)
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goto leave;
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_gpgme_engine_set_status_handler (ctx->engine, status_handler, ctx);
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_gpgme_engine_set_verbosity (ctx->engine, ctx->verbosity);
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err = _gpgme_engine_op_decrypt (ctx->engine, ciph, plain);
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if (!err) /* And kick off the process. */
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err = _gpgme_engine_start (ctx->engine, ctx);
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leave:
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if (err)
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{
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ctx->pending = 0;
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_gpgme_engine_release (ctx->engine);
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ctx->engine = NULL;
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}
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return err;
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}
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GpgmeError
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gpgme_op_decrypt_start (GpgmeCtx ctx, GpgmeData ciph, GpgmeData plain)
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{
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return _gpgme_decrypt_start (ctx, ciph, plain,
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_gpgme_decrypt_status_handler);
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}
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/**
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* gpgme_op_decrypt:
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* @ctx: The context
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* @in: ciphertext input
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* @out: plaintext output
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*
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* This function decrypts @in to @out.
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* Other parameters are take from the context @ctx.
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* The function does wait for the result.
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*
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* Return value: 0 on success or an errorcode.
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**/
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GpgmeError
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gpgme_op_decrypt (GpgmeCtx ctx, GpgmeData in, GpgmeData out)
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{
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GpgmeError err = gpgme_op_decrypt_start (ctx, in, out);
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if (!err)
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gpgme_wait (ctx, &err, 1);
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return err;
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}
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