[asterisk-commits] dvossel: trunk r171757 - in /trunk: CHANGES funcs/func_aes.c
SVN commits to the Asterisk project
asterisk-commits at lists.digium.com
Tue Jan 27 16:43:36 CST 2009
Author: dvossel
Date: Tue Jan 27 16:43:36 2009
New Revision: 171757
URL: http://svn.digium.com/svn-view/asterisk?view=rev&rev=171757
Log:
Adding AES_ENCRYPT and AES_DECRYPT dialplan functions.
(closes issue #14301)
Reported by: amorsen
review: http://reviewboard.digium.com/r/128/
Added:
trunk/funcs/func_aes.c (with props)
Modified:
trunk/CHANGES
Modified: trunk/CHANGES
URL: http://svn.digium.com/svn-view/asterisk/trunk/CHANGES?view=diff&rev=171757&r1=171756&r2=171757
==============================================================================
--- trunk/CHANGES (original)
+++ trunk/CHANGES Tue Jan 27 16:43:36 2009
@@ -78,6 +78,10 @@
Totally. Hopefully, that means more to you than it does to me.
* Added AUDIOHOOK_INHERIT. For information on its use, please see the output
of "core show function AUDIOHOOK_INHERIT" from the CLI
+ * Added AES_ENCRYPT. For information on its use, please see the output
+ of "core show function AES_ENCRYPT" from the CLI
+ * Added AES_DECRYPT. For information on its use, please see the output
+ of "core show function AES_DECRYPT" from the CLI
Applications
------------
Added: trunk/funcs/func_aes.c
URL: http://svn.digium.com/svn-view/asterisk/trunk/funcs/func_aes.c?view=auto&rev=171757
==============================================================================
--- trunk/funcs/func_aes.c (added)
+++ trunk/funcs/func_aes.c Tue Jan 27 16:43:36 2009
@@ -1,0 +1,164 @@
+/*
+ * Asterisk -- An open source telephony toolkit.
+ *
+ * Copyright (C) 2009, Digium, Inc.
+ *
+ * See http://www.asterisk.org for more information about
+ * the Asterisk project. Please do not directly contact
+ * any of the maintainers of this project for assistance;
+ * the project provides a web site, mailing lists and IRC
+ * channels for your use.
+ *
+ * This program is free software, distributed under the terms of
+ * the GNU General Public License Version 2. See the LICENSE file
+ * at the top of the source tree.
+ */
+
+/*! \file
+ *
+ * \brief AES encryption/decryption dialplan functions
+ *
+ * \author David Vossel <dvossel at digium.com>
+ * \ingroup functions
+ */
+
+
+#include "asterisk.h"
+
+ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
+
+#include "asterisk/module.h"
+#include "asterisk/pbx.h"
+#include "asterisk/app.h"
+#include "asterisk/aes.h"
+
+#define AES_BLOCK_SIZE 16
+
+/*** DOCUMENTATION
+ <function name="AES_ENCRYPT" language="en_US">
+ <synopsis>
+ Encrypt a string with AES given a 16 character key.
+ </synopsis>
+ <syntax>
+ <parameter name="string" required="true">
+ <para>Input string</para>
+ </parameter>
+ <parameter name="key" required="true">
+ <para>AES Key</para>
+ </parameter>
+ </syntax>
+ <description>
+ <para>Returns an AES encrypted string encoded in base64.</para>
+ </description>
+ </function>
+ <function name="AES_DECRYPT" language="en_US">
+ <synopsis>
+ Decrypt a string encoded in base64 with AES given a 16 character key.
+ </synopsis>
+ <syntax>
+ <parameter name="string" required="true">
+ <para>Input string.</para>
+ </parameter>
+ <parameter name="key" required="true">
+ <para>AES Key</para>
+ </parameter>
+
+ </syntax>
+ <description>
+ <para>Returns the plain text string.</para>
+ </description>
+ </function>
+ ***/
+
+
+static int aes_helper(struct ast_channel *chan, const char *cmd, char *data,
+ char *buf, size_t len)
+{
+ unsigned char curblock[AES_BLOCK_SIZE] = { 0, };
+ char *tmp;
+ char *tmpP;
+ int data_len, encrypt;
+ ast_aes_encrypt_key ecx; /* AES 128 Encryption context */
+ ast_aes_decrypt_key dcx;
+
+ AST_DECLARE_APP_ARGS(args,
+ AST_APP_ARG(key);
+ AST_APP_ARG(data);
+ );
+
+ AST_STANDARD_APP_ARGS(args, data);
+
+ if (ast_strlen_zero(args.data) || ast_strlen_zero(args.key)) {
+ ast_log(LOG_WARNING, "Syntax: %s(<key>,<data>) - missing argument!\n", cmd);
+ return -1;
+ }
+
+ if (strlen(args.key) != AES_BLOCK_SIZE) { /* key must be of 16 characters in length, 128 bits */
+ ast_log(LOG_WARNING, "Syntax: %s(<key>,<data>) - <key> parameter must be exactly 16 characters!\n", cmd);
+ return -1;
+ }
+
+ ast_aes_encrypt_key(args.key, &ecx); /* encryption: plaintext -> encryptedtext -> base64 */
+ ast_aes_decrypt_key(args.key, &dcx); /* decryption: base64 -> encryptedtext -> plaintext */
+ tmp = ast_calloc(1, len); /* requires a tmp buffer for the base64 decode */
+ tmpP = tmp;
+ encrypt = strcmp("AES_DECRYPT", cmd); /* -1 if encrypting, 0 if decrypting */
+
+ if (encrypt) { /* if decrypting first decode src to base64 */
+ ast_copy_string(tmp, args.data, len);
+ data_len = strlen(tmp);
+ } else {
+ data_len = ast_base64decode((unsigned char *) tmp, args.data, len);
+ }
+
+ if (data_len >= len) { /* make sure to not go over buffer len */
+ ast_log(LOG_WARNING, "Syntax: %s(<keys>,<data>) - <data> exceeds buffer length. Result may be truncated!\n", cmd);
+ data_len = len - 1;
+ }
+
+ while (data_len > 0) {
+ memset(curblock, 0, AES_BLOCK_SIZE);
+ memcpy(curblock, tmpP, (data_len < AES_BLOCK_SIZE) ? data_len : AES_BLOCK_SIZE);
+ if (encrypt) {
+ ast_aes_encrypt(curblock, tmpP, &ecx);
+ } else {
+ ast_aes_decrypt(curblock, tmpP, &dcx);
+ }
+ tmpP += AES_BLOCK_SIZE;
+ data_len -= AES_BLOCK_SIZE;
+ }
+
+ if (encrypt) { /* if encrypting encode result to base64 */
+ ast_base64encode(buf, (unsigned char *) tmp, strlen(tmp), len);
+ } else {
+ memcpy(buf, tmp, len);
+ }
+ ast_free(tmp);
+
+ return 0;
+}
+
+static struct ast_custom_function aes_encrypt_function = {
+ .name = "AES_ENCRYPT",
+ .read = aes_helper,
+};
+
+static struct ast_custom_function aes_decrypt_function = {
+ .name = "AES_DECRYPT",
+ .read = aes_helper,
+};
+
+static int unload_module(void)
+{
+ int res = ast_custom_function_unregister(&aes_decrypt_function);
+ return res | ast_custom_function_unregister(&aes_encrypt_function);
+}
+
+static int load_module(void)
+{
+ int res = ast_custom_function_register(&aes_decrypt_function);
+ res |= ast_custom_function_register(&aes_encrypt_function);
+ return res ? AST_MODULE_LOAD_DECLINE : AST_MODULE_LOAD_SUCCESS;
+}
+
+AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "AES dialplan functions");
Propchange: trunk/funcs/func_aes.c
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