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/* encrypt.c - Encrypt 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., 51 Franklin Street, Fifth Floor, Boston, MA
02111-1307, USA. */
#if HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include "gpgme.h"
#include "context.h"
#include "ops.h"
typedef struct
{
struct _gpgme_op_encrypt_result result;
/* A pointer to the next pointer of the last invalid recipient in
the list. This makes appending new invalid recipients painless
while preserving the order. */
gpgme_invalid_key_t *lastp;
} *op_data_t;
static void
release_op_data (void *hook)
{
op_data_t opd = (op_data_t) hook;
gpgme_invalid_key_t invalid_recipient = opd->result.invalid_recipients;
while (invalid_recipient)
{
gpgme_invalid_key_t next = invalid_recipient->next;
if (invalid_recipient->fpr)
free (invalid_recipient->fpr);
invalid_recipient = next;
}
}
gpgme_encrypt_result_t
gpgme_op_encrypt_result (gpgme_ctx_t ctx)
{
void *hook;
op_data_t opd;
gpgme_error_t err;
err = _gpgme_op_data_lookup (ctx, OPDATA_ENCRYPT, &hook, -1, NULL);
opd = hook;
if (err || !opd)
return NULL;
return &opd->result;
}
gpgme_error_t
_gpgme_encrypt_status_handler (void *priv, gpgme_status_code_t code,
char *args)
{
gpgme_ctx_t ctx = (gpgme_ctx_t) priv;
gpgme_error_t err;
void *hook;
op_data_t opd;
err = _gpgme_op_data_lookup (ctx, OPDATA_ENCRYPT, &hook, -1, NULL);
opd = hook;
if (err)
return err;
switch (code)
{
case GPGME_STATUS_EOF:
if (opd->result.invalid_recipients)
return gpg_error (GPG_ERR_UNUSABLE_PUBKEY);
break;
case GPGME_STATUS_INV_RECP:
err = _gpgme_parse_inv_recp (args, opd->lastp);
if (err)
return err;
opd->lastp = &(*opd->lastp)->next;
break;
case GPGME_STATUS_NO_RECP:
/* Should not happen, because we require at least one recipient. */
return gpg_error (GPG_ERR_GENERAL);
default:
break;
}
return 0;
}
static gpgme_error_t
encrypt_sym_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_passphrase_status_handler (priv, code, args);
return err;
}
static gpgme_error_t
encrypt_status_handler (void *priv, gpgme_status_code_t code, char *args)
{
return _gpgme_progress_status_handler (priv, code, args)
|| _gpgme_encrypt_status_handler (priv, code, args);
}
gpgme_error_t
_gpgme_op_encrypt_init_result (gpgme_ctx_t ctx)
{
gpgme_error_t err;
void *hook;
op_data_t opd;
err = _gpgme_op_data_lookup (ctx, OPDATA_ENCRYPT, &hook, sizeof (*opd),
release_op_data);
opd = hook;
if (err)
return err;
opd->lastp = &opd->result.invalid_recipients;
return 0;
}
static gpgme_error_t
encrypt_start (gpgme_ctx_t ctx, int synchronous, gpgme_key_t recp[],
gpgme_encrypt_flags_t flags,
gpgme_data_t plain, gpgme_data_t cipher)
{
gpgme_error_t err;
int symmetric = 0;
err = _gpgme_op_reset (ctx, synchronous);
if (err)
return err;
err = _gpgme_op_encrypt_init_result (ctx);
if (err)
return err;
if (!recp)
symmetric = 1;
if (!plain)
return gpg_error (GPG_ERR_NO_DATA);
if (!cipher)
return gpg_error (GPG_ERR_INV_VALUE);
if (recp && ! *recp)
return gpg_error (GPG_ERR_INV_VALUE);
if (symmetric && ctx->passphrase_cb)
{
/* Symmetric encryption requires a passphrase. */
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,
symmetric
? encrypt_sym_status_handler
: encrypt_status_handler,
ctx);
return _gpgme_engine_op_encrypt (ctx->engine, recp, flags, plain, cipher,
ctx->use_armor);
}
gpgme_error_t
gpgme_op_encrypt_start (gpgme_ctx_t ctx, gpgme_key_t recp[],
gpgme_encrypt_flags_t flags,
gpgme_data_t plain, gpgme_data_t cipher)
{
return encrypt_start (ctx, 0, recp, flags, plain, cipher);
}
/* Encrypt plaintext PLAIN within CTX for the recipients RECP and
store the resulting ciphertext in CIPHER. */
gpgme_error_t
gpgme_op_encrypt (gpgme_ctx_t ctx, gpgme_key_t recp[],
gpgme_encrypt_flags_t flags,
gpgme_data_t plain, gpgme_data_t cipher)
{
gpgme_error_t err = encrypt_start (ctx, 1, recp, flags, plain, cipher);
if (!err)
err = _gpgme_wait_one (ctx);
return err;
}
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