Asterisk - The Open Source Telephony Project GIT-master-f3e88d3
Macros | Functions | Variables
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/crypto.h"
Include dependency graph for func_aes.c:

Go to the source code of this file.

Macros

#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)
 
struct ast_moduleAST_MODULE_SELF_SYM (void)
 
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 = AST_BUILDOPT_SUM, .support_level = AST_MODULE_SUPPORT_CORE, .load = load_module, .unload = unload_module, .requires = "res_crypto", }
 
static struct ast_custom_function aes_decrypt_function
 
static struct ast_custom_function aes_encrypt_function
 
static const struct ast_module_infoast_module_info = &__mod_info
 

Detailed Description

AES encryption/decryption dialplan functions.

Author
David Vossel dvoss.nosp@m.el@d.nosp@m.igium.nosp@m..com

Definition in file func_aes.c.

Macro Definition Documentation

◆ AES_BLOCK_SIZE

#define AES_BLOCK_SIZE   16

Definition at line 38 of file func_aes.c.

Function Documentation

◆ __reg_module()

static void __reg_module ( void  )
static

Definition at line 185 of file func_aes.c.

◆ __unreg_module()

static void __unreg_module ( void  )
static

Definition at line 185 of file func_aes.c.

◆ aes_helper()

static int aes_helper ( struct ast_channel chan,
const char *  cmd,
char *  data,
char *  buf,
size_t  len 
)
static

Definition at line 86 of file func_aes.c.

88{
89 unsigned char curblock[AES_BLOCK_SIZE] = { 0, };
90 char *tmp;
91 char *tmpP;
92 int data_len, encrypt;
93 ast_aes_encrypt_key ecx; /* AES 128 Encryption context */
95
97 AST_APP_ARG(key);
98 AST_APP_ARG(data);
99 );
100
102
103 if (ast_strlen_zero(args.data) || ast_strlen_zero(args.key)) {
104 ast_log(LOG_WARNING, "Syntax: %s(<key>,<data>) - missing argument!\n", cmd);
105 return -1;
106 }
107
108 if (strlen(args.key) != AES_BLOCK_SIZE) { /* key must be of 16 characters in length, 128 bits */
109 ast_log(LOG_WARNING, "Syntax: %s(<key>,<data>) - <key> parameter must be exactly 16 characters!\n", cmd);
110 return -1;
111 }
112
113 ast_aes_set_encrypt_key((unsigned char *) args.key, &ecx); /* encryption: plaintext -> encryptedtext -> base64 */
114 ast_aes_set_decrypt_key((unsigned char *) args.key, &dcx); /* decryption: base64 -> encryptedtext -> plaintext */
115 tmp = ast_calloc(1, len); /* requires a tmp buffer for the base64 decode */
116 if (!tmp) {
117 ast_log(LOG_ERROR, "Unable to allocate memory for data\n");
118 return -1;
119 }
120 tmpP = tmp;
121 encrypt = strcmp("AES_DECRYPT", cmd); /* -1 if encrypting, 0 if decrypting */
122
123 if (encrypt) { /* if decrypting first decode src to base64 */
124 ast_copy_string(tmp, args.data, len);
125 data_len = strlen(tmp);
126 } else {
127 data_len = ast_base64decode((unsigned char *) tmp, args.data, len);
128 }
129
130 if (data_len >= len) { /* make sure to not go over buffer len */
131 ast_log(LOG_WARNING, "Syntax: %s(<keys>,<data>) - <data> exceeds buffer length. Result may be truncated!\n", cmd);
132 data_len = len - 1;
133 }
134
135 while (data_len > 0) {
136 memset(curblock, 0, AES_BLOCK_SIZE);
137 memcpy(curblock, tmpP, (data_len < AES_BLOCK_SIZE) ? data_len : AES_BLOCK_SIZE);
138 if (encrypt) {
139 ast_aes_encrypt(curblock, (unsigned char *) tmpP, &ecx);
140 } else {
141 ast_aes_decrypt(curblock, (unsigned char *) tmpP, &dcx);
142 }
143 tmpP += AES_BLOCK_SIZE;
144 data_len -= AES_BLOCK_SIZE;
145 }
146
147 if (encrypt) { /* if encrypting encode result to base64 */
148 ast_base64encode(buf, (unsigned char *) tmp, tmpP - tmp, len);
149 } else {
150 memcpy(buf, tmp, len);
151 }
152 ast_free(tmp);
153
154 return 0;
155}
#define ast_free(a)
Definition: astmm.h:180
#define ast_calloc(num, len)
A wrapper for calloc()
Definition: astmm.h:202
#define ast_log
Definition: astobj2.c:42
static int tmp()
Definition: bt_open.c:389
int ast_aes_set_encrypt_key(const unsigned char *key, ast_aes_encrypt_key *ctx)
Set an encryption key.
Definition: res_crypto.c:700
int ast_aes_set_decrypt_key(const unsigned char *key, ast_aes_decrypt_key *ctx)
Set a decryption key.
Definition: res_crypto.c:709
int ast_aes_encrypt(const unsigned char *in, unsigned char *out, const ast_aes_encrypt_key *key)
AES encrypt data.
Definition: res_crypto.c:749
int ast_aes_decrypt(const unsigned char *in, unsigned char *out, const ast_aes_decrypt_key *key)
AES decrypt data.
Definition: res_crypto.c:790
char buf[BUFSIZE]
Definition: eagi_proxy.c:66
#define AES_BLOCK_SIZE
Definition: func_aes.c:38
static int len(struct ast_channel *chan, const char *cmd, char *data, char *buf, size_t buflen)
#define AST_APP_ARG(name)
Define an application argument.
#define AST_DECLARE_APP_ARGS(name, arglist)
Declare a structure to hold an application's arguments.
#define AST_STANDARD_APP_ARGS(args, parse)
Performs the 'standard' argument separation process for an application.
#define LOG_ERROR
#define LOG_WARNING
static force_inline int attribute_pure ast_strlen_zero(const char *s)
Definition: strings.h:65
void ast_copy_string(char *dst, const char *src, size_t size)
Size-limited null-terminating string copy.
Definition: strings.h:425
Definition: crypto.h:39
const char * args
int ast_base64decode(unsigned char *dst, const char *src, int max)
Decode data from base64.
Definition: utils.c:296
int ast_base64encode(char *dst, const unsigned char *src, int srclen, int max)
Encode data in base64.
Definition: utils.c:406

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(), buf, len(), LOG_ERROR, LOG_WARNING, and tmp().

◆ AST_MODULE_SELF_SYM()

struct ast_module * AST_MODULE_SELF_SYM ( void  )

Definition at line 185 of file func_aes.c.

◆ load_module()

static int load_module ( void  )
static

Definition at line 173 of file func_aes.c.

174{
178}
static struct ast_custom_function aes_decrypt_function
Definition: func_aes.c:162
static struct ast_custom_function aes_encrypt_function
Definition: func_aes.c:157
@ AST_MODULE_LOAD_SUCCESS
Definition: module.h:70
@ AST_MODULE_LOAD_DECLINE
Module has failed to load, may be in an inconsistent state.
Definition: module.h:78
#define ast_custom_function_register(acf)
Register a custom function.
Definition: pbx.h:1558

References aes_decrypt_function, aes_encrypt_function, ast_custom_function_register, AST_MODULE_LOAD_DECLINE, and AST_MODULE_LOAD_SUCCESS.

◆ unload_module()

static int unload_module ( void  )
static

Definition at line 167 of file func_aes.c.

168{
171}
int ast_custom_function_unregister(struct ast_custom_function *acf)
Unregister a custom function.

References aes_decrypt_function, aes_encrypt_function, and ast_custom_function_unregister().

Variable Documentation

◆ __mod_info

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 = AST_BUILDOPT_SUM, .support_level = AST_MODULE_SUPPORT_CORE, .load = load_module, .unload = unload_module, .requires = "res_crypto", }
static

Definition at line 185 of file func_aes.c.

◆ aes_decrypt_function

struct ast_custom_function aes_decrypt_function
static
Initial value:
= {
.name = "AES_DECRYPT",
.read = aes_helper,
}
static int aes_helper(struct ast_channel *chan, const char *cmd, char *data, char *buf, size_t len)
Definition: func_aes.c:86

Definition at line 162 of file func_aes.c.

Referenced by load_module(), and unload_module().

◆ aes_encrypt_function

struct ast_custom_function aes_encrypt_function
static
Initial value:
= {
.name = "AES_ENCRYPT",
.read = aes_helper,
}

Definition at line 157 of file func_aes.c.

Referenced by load_module(), and unload_module().

◆ ast_module_info

const struct ast_module_info* ast_module_info = &__mod_info
static

Definition at line 185 of file func_aes.c.