#include "asterisk.h"
#include "asterisk/module.h"
#include "asterisk/pbx.h"
#include "asterisk/app.h"
#include "asterisk/crypto.h"
Go to the source code of this file.
Defines | |
#define | AES_BLOCK_SIZE 16 |
Functions | |
static void | __reg_module (void) |
static void | __unreg_module (void) |
static int | aes_helper (struct ast_channel *chan, const char *cmd, char *data, char *buf, size_t len) |
static int | load_module (void) |
static int | unload_module (void) |
Variables | |
static struct ast_module_info | __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_DEFAULT , .description = "AES dialplan functions" , .key = "This paragraph is copyright (c) 2006 by Digium, Inc. \In order for your module to load, it must return this \key via a function called \"key\". Any code which \includes this paragraph must be licensed under the GNU \General Public License version 2 or later (at your \option). In addition to Digium's general reservations \of rights, Digium expressly reserves the right to \allow other parties to license this paragraph under \different terms. Any use of Digium, Inc. trademarks or \logos (including \"Asterisk\" or \"Digium\") without \express written permission of Digium, Inc. is prohibited.\n" , .buildopt_sum = "ac1f6a56484a8820659555499174e588" , .load = load_module, .unload = unload_module, .nonoptreq = "res_crypto", } |
static struct ast_custom_function | aes_decrypt_function |
static struct ast_custom_function | aes_encrypt_function |
static struct ast_module_info * | ast_module_info = &__mod_info |
Definition in file func_aes.c.
#define AES_BLOCK_SIZE 16 |
static void __reg_module | ( | void | ) | [static] |
Definition at line 185 of file func_aes.c.
static void __unreg_module | ( | void | ) | [static] |
Definition at line 185 of file func_aes.c.
static int aes_helper | ( | struct ast_channel * | chan, | |
const char * | cmd, | |||
char * | data, | |||
char * | buf, | |||
size_t | len | |||
) | [static] |
Definition at line 87 of file func_aes.c.
References AES_BLOCK_SIZE, args, ast_aes_decrypt(), ast_aes_encrypt(), ast_aes_set_decrypt_key(), ast_aes_set_encrypt_key(), AST_APP_ARG, ast_base64decode(), ast_base64encode(), ast_calloc, ast_copy_string(), AST_DECLARE_APP_ARGS, ast_free, ast_log(), AST_STANDARD_APP_ARGS, ast_strlen_zero(), LOG_ERROR, and LOG_WARNING.
00089 { 00090 unsigned char curblock[AES_BLOCK_SIZE] = { 0, }; 00091 char *tmp; 00092 char *tmpP; 00093 int data_len, encrypt; 00094 ast_aes_encrypt_key ecx; /* AES 128 Encryption context */ 00095 ast_aes_decrypt_key dcx; 00096 00097 AST_DECLARE_APP_ARGS(args, 00098 AST_APP_ARG(key); 00099 AST_APP_ARG(data); 00100 ); 00101 00102 AST_STANDARD_APP_ARGS(args, data); 00103 00104 if (ast_strlen_zero(args.data) || ast_strlen_zero(args.key)) { 00105 ast_log(LOG_WARNING, "Syntax: %s(<key>,<data>) - missing argument!\n", cmd); 00106 return -1; 00107 } 00108 00109 if (strlen(args.key) != AES_BLOCK_SIZE) { /* key must be of 16 characters in length, 128 bits */ 00110 ast_log(LOG_WARNING, "Syntax: %s(<key>,<data>) - <key> parameter must be exactly 16 characters!\n", cmd); 00111 return -1; 00112 } 00113 00114 ast_aes_set_encrypt_key((unsigned char *) args.key, &ecx); /* encryption: plaintext -> encryptedtext -> base64 */ 00115 ast_aes_set_decrypt_key((unsigned char *) args.key, &dcx); /* decryption: base64 -> encryptedtext -> plaintext */ 00116 tmp = ast_calloc(1, len); /* requires a tmp buffer for the base64 decode */ 00117 if (!tmp) { 00118 ast_log(LOG_ERROR, "Unable to allocate memory for data\n"); 00119 return -1; 00120 } 00121 tmpP = tmp; 00122 encrypt = strcmp("AES_DECRYPT", cmd); /* -1 if encrypting, 0 if decrypting */ 00123 00124 if (encrypt) { /* if decrypting first decode src to base64 */ 00125 ast_copy_string(tmp, args.data, len); 00126 data_len = strlen(tmp); 00127 } else { 00128 data_len = ast_base64decode((unsigned char *) tmp, args.data, len); 00129 } 00130 00131 if (data_len >= len) { /* make sure to not go over buffer len */ 00132 ast_log(LOG_WARNING, "Syntax: %s(<keys>,<data>) - <data> exceeds buffer length. Result may be truncated!\n", cmd); 00133 data_len = len - 1; 00134 } 00135 00136 while (data_len > 0) { 00137 memset(curblock, 0, AES_BLOCK_SIZE); 00138 memcpy(curblock, tmpP, (data_len < AES_BLOCK_SIZE) ? data_len : AES_BLOCK_SIZE); 00139 if (encrypt) { 00140 ast_aes_encrypt(curblock, (unsigned char *) tmpP, &ecx); 00141 } else { 00142 ast_aes_decrypt(curblock, (unsigned char *) tmpP, &dcx); 00143 } 00144 tmpP += AES_BLOCK_SIZE; 00145 data_len -= AES_BLOCK_SIZE; 00146 } 00147 00148 if (encrypt) { /* if encrypting encode result to base64 */ 00149 ast_base64encode(buf, (unsigned char *) tmp, strlen(tmp), len); 00150 } else { 00151 memcpy(buf, tmp, len); 00152 } 00153 ast_free(tmp); 00154 00155 return 0; 00156 }
static int load_module | ( | void | ) | [static] |
Definition at line 174 of file func_aes.c.
References aes_decrypt_function, aes_encrypt_function, ast_custom_function_register, AST_MODULE_LOAD_DECLINE, and AST_MODULE_LOAD_SUCCESS.
00175 { 00176 int res = ast_custom_function_register(&aes_decrypt_function); 00177 res |= ast_custom_function_register(&aes_encrypt_function); 00178 return res ? AST_MODULE_LOAD_DECLINE : AST_MODULE_LOAD_SUCCESS; 00179 }
static int unload_module | ( | void | ) | [static] |
Definition at line 168 of file func_aes.c.
References aes_decrypt_function, aes_encrypt_function, and ast_custom_function_unregister().
00169 { 00170 int res = ast_custom_function_unregister(&aes_decrypt_function); 00171 return res | ast_custom_function_unregister(&aes_encrypt_function); 00172 }
struct ast_module_info __mod_info = { .name = AST_MODULE, .flags = AST_MODFLAG_DEFAULT , .description = "AES dialplan functions" , .key = "This paragraph is copyright (c) 2006 by Digium, Inc. \In order for your module to load, it must return this \key via a function called \"key\". Any code which \includes this paragraph must be licensed under the GNU \General Public License version 2 or later (at your \option). In addition to Digium's general reservations \of rights, Digium expressly reserves the right to \allow other parties to license this paragraph under \different terms. Any use of Digium, Inc. trademarks or \logos (including \"Asterisk\" or \"Digium\") without \express written permission of Digium, Inc. is prohibited.\n" , .buildopt_sum = "ac1f6a56484a8820659555499174e588" , .load = load_module, .unload = unload_module, .nonoptreq = "res_crypto", } [static] |
Definition at line 185 of file func_aes.c.
struct ast_custom_function aes_decrypt_function [static] |
Initial value:
{ .name = "AES_DECRYPT", .read = aes_helper, }
Definition at line 163 of file func_aes.c.
Referenced by load_module(), and unload_module().
struct ast_custom_function aes_encrypt_function [static] |
Initial value:
{ .name = "AES_ENCRYPT", .read = aes_helper, }
Definition at line 158 of file func_aes.c.
Referenced by load_module(), and unload_module().
struct ast_module_info* ast_module_info = &__mod_info [static] |
Definition at line 185 of file func_aes.c.