func_aes.c File Reference
AES encryption/decryption dialplan functions. More...
#include "asterisk.h"#include "asterisk/module.h"#include "asterisk/pbx.h"#include "asterisk/app.h"#include "asterisk/aes.h"
Include dependency graph for func_aes.c:
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 __MODULE_INFO_SECTION | __mod_info = { __MODULE_INFO_GLOBALS .name = AST_MODULE, .flags = AST_MODFLAG_DEFAULT , .description = "AES dialplan functions" , .key = ASTERISK_GPL_KEY , .buildopt_sum = AST_BUILDOPT_SUM, .load = load_module, .unload = unload_module, } |
| 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 |
Detailed Description
AES encryption/decryption dialplan functions.
Definition in file func_aes.c.
Define Documentation
| #define AES_BLOCK_SIZE 16 |
Definition at line 35 of file func_aes.c.
Referenced by aes_helper().
Function Documentation
| static void __reg_module | ( | void | ) | [static] |
Definition at line 173 of file func_aes.c.
| static void __unreg_module | ( | void | ) | [static] |
Definition at line 173 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 83 of file func_aes.c.
References AES_BLOCK_SIZE, ast_aes_decrypt, ast_aes_encrypt, 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(), and LOG_WARNING.
{
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((unsigned char *) args.key, &ecx); /* encryption: plaintext -> encryptedtext -> base64 */
ast_aes_decrypt_key((unsigned char *) 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, (unsigned char *) tmpP, &ecx);
} else {
ast_aes_decrypt(curblock, (unsigned char *) 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 int load_module | ( | void | ) | [static] |
Definition at line 166 of file func_aes.c.
References ast_custom_function_register, AST_MODULE_LOAD_DECLINE, and AST_MODULE_LOAD_SUCCESS.
{
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;
}
| static int unload_module | ( | void | ) | [static] |
Definition at line 160 of file func_aes.c.
References ast_custom_function_unregister().
{
int res = ast_custom_function_unregister(&aes_decrypt_function);
return res | ast_custom_function_unregister(&aes_encrypt_function);
}
Variable Documentation
struct ast_module_info __MODULE_INFO_SECTION __mod_info = { __MODULE_INFO_GLOBALS .name = AST_MODULE, .flags = AST_MODFLAG_DEFAULT , .description = "AES dialplan functions" , .key = ASTERISK_GPL_KEY , .buildopt_sum = AST_BUILDOPT_SUM, .load = load_module, .unload = unload_module, } [static] |
Definition at line 173 of file func_aes.c.
struct ast_custom_function aes_decrypt_function [static] |
Initial value:
{
.name = "AES_DECRYPT",
.read = aes_helper,
}
Definition at line 155 of file func_aes.c.
struct ast_custom_function aes_encrypt_function [static] |
Initial value:
{
.name = "AES_ENCRYPT",
.read = aes_helper,
}
Definition at line 150 of file func_aes.c.
struct ast_module_info* ast_module_info = &__mod_info [static] |
Definition at line 173 of file func_aes.c.
