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-rw-r--r--src/exchangedb/exchangedb_denomkeys.c269
1 files changed, 269 insertions, 0 deletions
diff --git a/src/exchangedb/exchangedb_denomkeys.c b/src/exchangedb/exchangedb_denomkeys.c
new file mode 100644
index 000000000..dea312dd2
--- /dev/null
+++ b/src/exchangedb/exchangedb_denomkeys.c
@@ -0,0 +1,269 @@
+/*
+ This file is part of TALER
+ Copyright (C) 2014, 2015, 2016 Inria & GNUnet e.V.
+
+ TALER is free software; you can redistribute it and/or modify it under the
+ terms of the GNU General Public License as published by the Free Software
+ Foundation; either version 3, or (at your option) any later version.
+
+ TALER 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 General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along with
+ TALER; see the file COPYING. If not, If not, see <http://www.gnu.org/licenses/>
+*/
+/**
+ * @file exchangedb/exchangedb_denomkeys.c
+ * @brief I/O operations for the Exchange's denomination private keys
+ * @author Florian Dold
+ * @author Benedikt Mueller
+ * @author Sree Harsha Totakura
+ * @author Christian Grothoff
+ */
+#include "platform.h"
+#include "taler_exchangedb_lib.h"
+
+
+/**
+ * Import a denomination key from the given file.
+ *
+ * @param filename the file to import the key from
+ * @param[out] dki set to the imported denomination key
+ * @return #GNUNET_OK upon success;
+ * #GNUNET_SYSERR upon failure
+ */
+int
+TALER_EXCHANGEDB_denomination_key_read (const char *filename,
+ struct TALER_EXCHANGEDB_DenominationKeyIssueInformation *dki)
+{
+ uint64_t size;
+ size_t offset;
+ void *data;
+ struct GNUNET_CRYPTO_RsaPrivateKey *priv;
+
+ if (GNUNET_OK != GNUNET_DISK_file_size (filename,
+ &size,
+ GNUNET_YES,
+ GNUNET_YES))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_INFO,
+ "Skipping inaccessable denomination key file `%s'\n",
+ filename);
+ return GNUNET_SYSERR;
+ }
+ offset = sizeof (struct TALER_EXCHANGEDB_DenominationKeyInformationP);
+ if (size <= offset)
+ {
+ GNUNET_break (0);
+ return GNUNET_SYSERR;
+ }
+ data = GNUNET_malloc (size);
+ if (size !=
+ GNUNET_DISK_fn_read (filename,
+ data,
+ size))
+ {
+ GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_WARNING,
+ "read",
+ filename);
+ GNUNET_free (data);
+ return GNUNET_SYSERR;
+ }
+ if (NULL ==
+ (priv = GNUNET_CRYPTO_rsa_private_key_decode (data + offset,
+ size - offset)))
+ {
+ GNUNET_free (data);
+ return GNUNET_SYSERR;
+ }
+ GNUNET_assert (NULL == dki->denom_priv.rsa_private_key);
+ dki->denom_priv.rsa_private_key = priv;
+ dki->denom_pub.rsa_public_key
+ = GNUNET_CRYPTO_rsa_private_key_get_public (priv);
+ memcpy (&dki->issue,
+ data,
+ offset);
+ GNUNET_free (data);
+ return GNUNET_OK;
+}
+
+
+/**
+ * Exports a denomination key to the given file.
+ *
+ * @param filename the file where to write the denomination key
+ * @param dki the denomination key
+ * @return #GNUNET_OK upon success; #GNUNET_SYSERR upon failure.
+ */
+int
+TALER_EXCHANGEDB_denomination_key_write (const char *filename,
+ const struct TALER_EXCHANGEDB_DenominationKeyIssueInformation *dki)
+{
+ char *priv_enc;
+ size_t priv_enc_size;
+ struct GNUNET_DISK_FileHandle *fh;
+ ssize_t wrote;
+ size_t wsize;
+ int ret;
+
+ fh = NULL;
+ priv_enc_size
+ = GNUNET_CRYPTO_rsa_private_key_encode (dki->denom_priv.rsa_private_key,
+ &priv_enc);
+ ret = GNUNET_SYSERR;
+ if (GNUNET_OK !=
+ GNUNET_DISK_directory_create_for_file (filename))
+ return GNUNET_SYSERR;
+ if (NULL == (fh = GNUNET_DISK_file_open
+ (filename,
+ GNUNET_DISK_OPEN_WRITE | GNUNET_DISK_OPEN_CREATE | GNUNET_DISK_OPEN_TRUNCATE,
+ GNUNET_DISK_PERM_USER_READ | GNUNET_DISK_PERM_USER_WRITE)))
+ goto cleanup;
+ wsize = sizeof (struct TALER_EXCHANGEDB_DenominationKeyInformationP);
+ if (GNUNET_SYSERR == (wrote = GNUNET_DISK_file_write (fh,
+ &dki->issue,
+ wsize)))
+ goto cleanup;
+ if (wrote != wsize)
+ goto cleanup;
+ if (GNUNET_SYSERR ==
+ (wrote = GNUNET_DISK_file_write (fh,
+ priv_enc,
+ priv_enc_size)))
+ goto cleanup;
+ if (wrote != priv_enc_size)
+ goto cleanup;
+ ret = GNUNET_OK;
+ cleanup:
+ GNUNET_free_non_null (priv_enc);
+ if (NULL != fh)
+ (void) GNUNET_DISK_file_close (fh);
+ return ret;
+}
+
+
+/**
+ * Closure for #denomkeys_iterate_keydir_iter() and
+ * #denomkeys_iterate_topdir_iter().
+ */
+struct DenomkeysIterateContext
+{
+
+ /**
+ * Set to the name of the directory below the top-level directory
+ * during the call to #denomkeys_iterate_keydir_iter().
+ */
+ const char *alias;
+
+ /**
+ * Function to call on each denomination key.
+ */
+ TALER_EXCHANGEDB_DenominationKeyIterator it;
+
+ /**
+ * Closure for @e it.
+ */
+ void *it_cls;
+};
+
+
+/**
+ * Decode the denomination key in the given file @a filename and call
+ * the callback in @a cls with the information.
+ *
+ * @param cls the `struct DenomkeysIterateContext *`
+ * @param filename name of a file that should contain
+ * a denomination key
+ * @return #GNUNET_OK to continue to iterate
+ * #GNUNET_NO to abort iteration with success
+ * #GNUNET_SYSERR to abort iteration with failure
+ */
+static int
+denomkeys_iterate_keydir_iter (void *cls,
+ const char *filename)
+{
+ struct DenomkeysIterateContext *dic = cls;
+ struct TALER_EXCHANGEDB_DenominationKeyIssueInformation issue;
+ int ret;
+
+ memset (&issue, 0, sizeof (issue));
+ if (GNUNET_OK !=
+ TALER_EXCHANGEDB_denomination_key_read (filename,
+ &issue))
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ "Invalid denomkey file: '%s'\n",
+ filename);
+ return GNUNET_OK;
+ }
+ ret = dic->it (dic->it_cls,
+ dic->alias,
+ &issue);
+ GNUNET_CRYPTO_rsa_private_key_free (issue.denom_priv.rsa_private_key);
+ GNUNET_CRYPTO_rsa_public_key_free (issue.denom_pub.rsa_public_key);
+ return ret;
+}
+
+
+/**
+ * Function called on each subdirectory in the #TALER_EXCHANGEDB_DIR_DENOMINATION_KEYS. Will
+ * call the #denomkeys_iterate_keydir_iter() on each file in the
+ * subdirectory.
+ *
+ * @param cls the `struct DenomkeysIterateContext *`
+ * @param filename name of the subdirectory to scan
+ * @return #GNUNET_OK on success,
+ * #GNUNET_SYSERR if we need to abort
+ */
+static int
+denomkeys_iterate_topdir_iter (void *cls,
+ const char *filename)
+{
+ struct DenomkeysIterateContext *dic = cls;
+
+ dic->alias = GNUNET_STRINGS_get_short_name (filename);
+ if (0 > GNUNET_DISK_directory_scan (filename,
+ &denomkeys_iterate_keydir_iter,
+ dic))
+ return GNUNET_SYSERR;
+ return GNUNET_OK;
+}
+
+
+/**
+ * Call @a it for each denomination key found in the @a exchange_base_dir.
+ *
+ * @param exchange_base_dir base directory for the exchange,
+ * the signing keys must be in the #TALER_EXCHANGEDB_DIR_DENOMINATION_KEYS
+ * subdirectory
+ * @param it function to call on each denomination key found
+ * @param it_cls closure for @a it
+ * @return -1 on error, 0 if no files were found, otherwise
+ * a positive number (however, even with a positive
+ * number it is possible that @a it was never called
+ * as maybe none of the files were well-formed)
+ */
+int
+TALER_EXCHANGEDB_denomination_keys_iterate (const char *exchange_base_dir,
+ TALER_EXCHANGEDB_DenominationKeyIterator it,
+ void *it_cls)
+{
+ char *dir;
+ struct DenomkeysIterateContext dic;
+ int ret;
+
+ GNUNET_asprintf (&dir,
+ "%s" DIR_SEPARATOR_STR TALER_EXCHANGEDB_DIR_DENOMINATION_KEYS,
+ exchange_base_dir);
+ dic.it = it;
+ dic.it_cls = it_cls;
+ ret = GNUNET_DISK_directory_scan (dir,
+ &denomkeys_iterate_topdir_iter,
+ &dic);
+ GNUNET_free (dir);
+ return ret;
+}
+
+
+/* end of exchangedb_denomkeys.c */