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-rw-r--r--src/encrypt.c288
1 files changed, 288 insertions, 0 deletions
diff --git a/src/encrypt.c b/src/encrypt.c
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+++ b/src/encrypt.c
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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., 59 Temple Place - Suite 330, 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 "debug.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);
+ free (invalid_recipient);
+ 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;
+
+ TRACE_BEG (DEBUG_CTX, "gpgme_op_encrypt_result", ctx);
+
+ err = _gpgme_op_data_lookup (ctx, OPDATA_ENCRYPT, &hook, -1, NULL);
+ opd = hook;
+
+ if (err || !opd)
+ {
+ TRACE_SUC0 ("result=(null)");
+ return NULL;
+ }
+
+ if (_gpgme_debug_trace ())
+ {
+ gpgme_invalid_key_t invkeys = opd->result.invalid_recipients;
+ int i = 0;
+
+ while (invkeys)
+ {
+ TRACE_LOG3 ("invalid_recipients[%i] = %s (%s)",
+ i, invkeys->fpr ? invkeys->fpr : "(null)",
+ gpg_strerror (invkeys->reason));
+ invkeys = invkeys->next;
+ i++;
+ }
+ }
+
+ TRACE_SUC1 ("result=%p", &opd->result);
+ 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)
+{
+ gpgme_error_t err;
+
+ TRACE_BEG3 (DEBUG_CTX, "gpgme_op_encrypt_start", ctx,
+ "flags=0x%x, plain=%p, cipher=%p", flags, plain, cipher);
+
+ if (!ctx)
+ return TRACE_ERR (gpg_error (GPG_ERR_INV_VALUE));
+
+ if (_gpgme_debug_trace () && recp)
+ {
+ int i = 0;
+
+ while (recp[i])
+ {
+ TRACE_LOG3 ("recipient[%i] = %p (%s)", i, recp[i],
+ (recp[i]->subkeys && recp[i]->subkeys->fpr) ?
+ recp[i]->subkeys->fpr : "invalid");
+ i++;
+ }
+ }
+
+ err = encrypt_start (ctx, 0, recp, flags, plain, cipher);
+ return TRACE_ERR (err);
+}
+
+
+/* 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;
+
+ TRACE_BEG3 (DEBUG_CTX, "gpgme_op_encrypt", ctx,
+ "flags=0x%x, plain=%p, cipher=%p", flags, plain, cipher);
+
+ if (!ctx)
+ return TRACE_ERR (gpg_error (GPG_ERR_INV_VALUE));
+
+ if (_gpgme_debug_trace () && recp)
+ {
+ int i = 0;
+
+ while (recp[i])
+ {
+ TRACE_LOG3 ("recipient[%i] = %p (%s)", i, recp[i],
+ (recp[i]->subkeys && recp[i]->subkeys->fpr) ?
+ recp[i]->subkeys->fpr : "invalid");
+ i++;
+ }
+ }
+
+ err = encrypt_start (ctx, 1, recp, flags, plain, cipher);
+ if (!err)
+ err = _gpgme_wait_one (ctx);
+ return TRACE_ERR (err);
+}