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Asterisk developer's documentation


res_crypto.c

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00001 /*
00002  * Asterisk -- An open source telephony toolkit.
00003  *
00004  * Copyright (C) 1999 - 2006, Digium, Inc.
00005  *
00006  * Mark Spencer <markster@digium.com>
00007  *
00008  * See http://www.asterisk.org for more information about
00009  * the Asterisk project. Please do not directly contact
00010  * any of the maintainers of this project for assistance;
00011  * the project provides a web site, mailing lists and IRC
00012  * channels for your use.
00013  *
00014  * This program is free software, distributed under the terms of
00015  * the GNU General Public License Version 2. See the LICENSE file
00016  * at the top of the source tree.
00017  */
00018 
00019 /*! \file
00020  *
00021  * \brief Provide Cryptographic Signature capability
00022  *
00023  * \author Mark Spencer <markster@digium.com>
00024  *
00025  * \extref Uses the OpenSSL library, available at
00026  * http://www.openssl.org/
00027  */
00028 
00029 /*** MODULEINFO
00030    <depend>openssl</depend>
00031    <support_level>core</support_level>
00032  ***/
00033 
00034 #include "asterisk.h"
00035 
00036 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 413586 $")
00037 
00038 #include "asterisk/paths.h"   /* use ast_config_AST_KEY_DIR */
00039 #include <openssl/ssl.h>
00040 #include <openssl/err.h>
00041 #include <openssl/aes.h>
00042 #include <dirent.h>
00043 
00044 #include "asterisk/module.h"
00045 #include "asterisk/md5.h"
00046 #include "asterisk/cli.h"
00047 #include "asterisk/io.h"
00048 #include "asterisk/lock.h"
00049 #include "asterisk/utils.h"
00050 
00051 #define AST_API_MODULE
00052 #include "asterisk/crypto.h"
00053 
00054 /*
00055  * Asterisk uses RSA keys with SHA-1 message digests for its
00056  * digital signatures.  The choice of RSA is due to its higher
00057  * throughput on verification, and the choice of SHA-1 based
00058  * on the recently discovered collisions in MD5's compression
00059  * algorithm and recommendations of avoiding MD5 in new schemes
00060  * from various industry experts.
00061  *
00062  * We use OpenSSL to provide our crypto routines, although we never
00063  * actually use full-up SSL
00064  *
00065  */
00066 
00067 #define KEY_NEEDS_PASSCODE (1 << 16)
00068 
00069 struct ast_key {
00070    /*! Name of entity */
00071    char name[80];
00072    /*! File name */
00073    char fn[256];
00074    /*! Key type (AST_KEY_PUB or AST_KEY_PRIV, along with flags from above) */
00075    int ktype;
00076    /*! RSA structure (if successfully loaded) */
00077    RSA *rsa;
00078    /*! Whether we should be deleted */
00079    int delme;
00080    /*! FD for input (or -1 if no input allowed, or -2 if we needed input) */
00081    int infd;
00082    /*! FD for output */
00083    int outfd;
00084    /*! Last MD5 Digest */
00085    unsigned char digest[16];
00086    AST_RWLIST_ENTRY(ast_key) list;
00087 };
00088 
00089 static AST_RWLIST_HEAD_STATIC(keys, ast_key);
00090 
00091 /*!
00092  * \brief setting of priv key
00093  * \param buf
00094  * \param size
00095  * \param rwflag
00096  * \param userdata
00097  * \return length of string,-1 on failure
00098 */
00099 static int pw_cb(char *buf, int size, int rwflag, void *userdata)
00100 {
00101    struct ast_key *key = (struct ast_key *)userdata;
00102    char prompt[256];
00103    int tmp;
00104    int res;
00105 
00106    if (key->infd < 0) {
00107       /* Note that we were at least called */
00108       key->infd = -2;
00109       return -1;
00110    }
00111 
00112    snprintf(prompt, sizeof(prompt), ">>>> passcode for %s key '%s': ",
00113        key->ktype == AST_KEY_PRIVATE ? "PRIVATE" : "PUBLIC", key->name);
00114    if (write(key->outfd, prompt, strlen(prompt)) < 0) {
00115       ast_log(LOG_WARNING, "write() failed: %s\n", strerror(errno));
00116       key->infd = -2;
00117       return -1;
00118    }
00119    tmp = ast_hide_password(key->infd);
00120    memset(buf, 0, size);
00121    res = read(key->infd, buf, size);
00122    if (res == -1) {
00123       ast_log(LOG_WARNING, "read() failed: %s\n", strerror(errno));
00124    }
00125    ast_restore_tty(key->infd, tmp);
00126    if (buf[strlen(buf) -1] == '\n') {
00127       buf[strlen(buf) - 1] = '\0';
00128    }
00129    return strlen(buf);
00130 }
00131 
00132 /*!
00133  * \brief return the ast_key structure for name
00134  * \see ast_key_get
00135 */
00136 struct ast_key * AST_OPTIONAL_API_NAME(ast_key_get)(const char *kname, int ktype)
00137 {
00138    struct ast_key *key;
00139 
00140    AST_RWLIST_RDLOCK(&keys);
00141    AST_RWLIST_TRAVERSE(&keys, key, list) {
00142       if (!strcmp(kname, key->name) &&
00143           (ktype == key->ktype)) {
00144          break;
00145       }
00146    }
00147    AST_RWLIST_UNLOCK(&keys);
00148 
00149    return key;
00150 }
00151 
00152 /*!
00153  * \brief load RSA key from file
00154  * \param dir directory string
00155  * \param fname name of file
00156  * \param ifd incoming file descriptor
00157  * \param ofd outgoing file descriptor
00158  * \param not2
00159  * \retval key on success.
00160  * \retval NULL on failure.
00161 */
00162 static struct ast_key *try_load_key(const char *dir, const char *fname, int ifd, int ofd, int *not2)
00163 {
00164    int ktype = 0, found = 0;
00165    char *c = NULL, ffname[256];
00166    unsigned char digest[16];
00167    FILE *f;
00168    struct MD5Context md5;
00169    struct ast_key *key;
00170    static int notice = 0;
00171 
00172    /* Make sure its name is a public or private key */
00173    if ((c = strstr(fname, ".pub")) && !strcmp(c, ".pub")) {
00174       ktype = AST_KEY_PUBLIC;
00175    } else if ((c = strstr(fname, ".key")) && !strcmp(c, ".key")) {
00176       ktype = AST_KEY_PRIVATE;
00177    } else {
00178       return NULL;
00179    }
00180 
00181    /* Get actual filename */
00182    snprintf(ffname, sizeof(ffname), "%s/%s", dir, fname);
00183 
00184    /* Open file */
00185    if (!(f = fopen(ffname, "r"))) {
00186       ast_log(LOG_WARNING, "Unable to open key file %s: %s\n", ffname, strerror(errno));
00187       return NULL;
00188    }
00189 
00190    MD5Init(&md5);
00191    while (!feof(f)) {
00192       /* Calculate a "whatever" quality md5sum of the key */
00193       char buf[256] = "";
00194       if (!fgets(buf, sizeof(buf), f)) {
00195          continue;
00196       }
00197       if (!feof(f)) {
00198          MD5Update(&md5, (unsigned char *) buf, strlen(buf));
00199       }
00200    }
00201    MD5Final(digest, &md5);
00202 
00203    /* Look for an existing key */
00204    AST_RWLIST_TRAVERSE(&keys, key, list) {
00205       if (!strcasecmp(key->fn, ffname)) {
00206          break;
00207       }
00208    }
00209 
00210    if (key) {
00211       /* If the MD5 sum is the same, and it isn't awaiting a passcode
00212          then this is far enough */
00213       if (!memcmp(digest, key->digest, 16) &&
00214           !(key->ktype & KEY_NEEDS_PASSCODE)) {
00215          fclose(f);
00216          key->delme = 0;
00217          return NULL;
00218       } else {
00219          /* Preserve keytype */
00220          ktype = key->ktype;
00221          /* Recycle the same structure */
00222          found++;
00223       }
00224    }
00225 
00226    /* Make fname just be the normal name now */
00227    *c = '\0';
00228    if (!key) {
00229       if (!(key = ast_calloc(1, sizeof(*key)))) {
00230          fclose(f);
00231          return NULL;
00232       }
00233    }
00234    /* First the filename */
00235    ast_copy_string(key->fn, ffname, sizeof(key->fn));
00236    /* Then the name */
00237    ast_copy_string(key->name, fname, sizeof(key->name));
00238    key->ktype = ktype;
00239    /* Yes, assume we're going to be deleted */
00240    key->delme = 1;
00241    /* Keep the key type */
00242    memcpy(key->digest, digest, 16);
00243    /* Can I/O takes the FD we're given */
00244    key->infd = ifd;
00245    key->outfd = ofd;
00246    /* Reset the file back to the beginning */
00247    rewind(f);
00248    /* Now load the key with the right method */
00249    if (ktype == AST_KEY_PUBLIC) {
00250       key->rsa = PEM_read_RSA_PUBKEY(f, NULL, pw_cb, key);
00251    } else {
00252       key->rsa = PEM_read_RSAPrivateKey(f, NULL, pw_cb, key);
00253    }
00254    fclose(f);
00255    if (key->rsa) {
00256       if (RSA_size(key->rsa) == 128) {
00257          /* Key loaded okay */
00258          key->ktype &= ~KEY_NEEDS_PASSCODE;
00259          ast_verb(3, "Loaded %s key '%s'\n", key->ktype == AST_KEY_PUBLIC ? "PUBLIC" : "PRIVATE", key->name);
00260          ast_debug(1, "Key '%s' loaded OK\n", key->name);
00261          key->delme = 0;
00262       } else {
00263          ast_log(LOG_NOTICE, "Key '%s' is not expected size.\n", key->name);
00264       }
00265    } else if (key->infd != -2) {
00266       ast_log(LOG_WARNING, "Key load %s '%s' failed\n",key->ktype == AST_KEY_PUBLIC ? "PUBLIC" : "PRIVATE", key->name);
00267       if (ofd > -1) {
00268          ERR_print_errors_fp(stderr);
00269       } else {
00270          ERR_print_errors_fp(stderr);
00271       }
00272    } else {
00273       ast_log(LOG_NOTICE, "Key '%s' needs passcode.\n", key->name);
00274       key->ktype |= KEY_NEEDS_PASSCODE;
00275       if (!notice) {
00276          if (!ast_opt_init_keys) {
00277             ast_log(LOG_NOTICE, "Add the '-i' flag to the asterisk command line if you want to automatically initialize passcodes at launch.\n");
00278          }
00279          notice++;
00280       }
00281       /* Keep it anyway */
00282       key->delme = 0;
00283       /* Print final notice about "keys init" when done */
00284       *not2 = 1;
00285    }
00286 
00287    /* If this is a new key add it to the list */
00288    if (!found) {
00289       AST_RWLIST_INSERT_TAIL(&keys, key, list);
00290    }
00291 
00292    return key;
00293 }
00294 
00295 /*!
00296  * \brief signs outgoing message with public key
00297  * \see ast_sign_bin
00298 */
00299 int AST_OPTIONAL_API_NAME(ast_sign_bin)(struct ast_key *key, const char *msg, int msglen, unsigned char *dsig)
00300 {
00301    unsigned char digest[20];
00302    unsigned int siglen = 128;
00303    int res;
00304 
00305    if (key->ktype != AST_KEY_PRIVATE) {
00306       ast_log(LOG_WARNING, "Cannot sign with a public key\n");
00307       return -1;
00308    }
00309 
00310    /* Calculate digest of message */
00311    SHA1((unsigned char *)msg, msglen, digest);
00312 
00313    /* Verify signature */
00314    if (!(res = RSA_sign(NID_sha1, digest, sizeof(digest), dsig, &siglen, key->rsa))) {
00315       ast_log(LOG_WARNING, "RSA Signature (key %s) failed\n", key->name);
00316       return -1;
00317    }
00318 
00319    if (siglen != 128) {
00320       ast_log(LOG_WARNING, "Unexpected signature length %d, expecting %d\n", (int)siglen, (int)128);
00321       return -1;
00322    }
00323 
00324    return 0;
00325 }
00326 
00327 /*!
00328  * \brief decrypt a message
00329  * \see ast_decrypt_bin
00330 */
00331 int AST_OPTIONAL_API_NAME(ast_decrypt_bin)(unsigned char *dst, const unsigned char *src, int srclen, struct ast_key *key)
00332 {
00333    int res, pos = 0;
00334 
00335    if (key->ktype != AST_KEY_PRIVATE) {
00336       ast_log(LOG_WARNING, "Cannot decrypt with a public key\n");
00337       return -1;
00338    }
00339 
00340    if (srclen % 128) {
00341       ast_log(LOG_NOTICE, "Tried to decrypt something not a multiple of 128 bytes\n");
00342       return -1;
00343    }
00344 
00345    while (srclen) {
00346       /* Process chunks 128 bytes at a time */
00347       if ((res = RSA_private_decrypt(128, src, dst, key->rsa, RSA_PKCS1_OAEP_PADDING)) < 0) {
00348          return -1;
00349       }
00350       pos += res;
00351       src += 128;
00352       srclen -= 128;
00353       dst += res;
00354    }
00355 
00356    return pos;
00357 }
00358 
00359 /*!
00360  * \brief encrypt a message
00361  * \see ast_encrypt_bin
00362 */
00363 int AST_OPTIONAL_API_NAME(ast_encrypt_bin)(unsigned char *dst, const unsigned char *src, int srclen, struct ast_key *key)
00364 {
00365    int res, bytes, pos = 0;
00366 
00367    if (key->ktype != AST_KEY_PUBLIC) {
00368       ast_log(LOG_WARNING, "Cannot encrypt with a private key\n");
00369       return -1;
00370    }
00371 
00372    while (srclen) {
00373       bytes = srclen;
00374       if (bytes > 128 - 41) {
00375          bytes = 128 - 41;
00376       }
00377       /* Process chunks 128-41 bytes at a time */
00378       if ((res = RSA_public_encrypt(bytes, src, dst, key->rsa, RSA_PKCS1_OAEP_PADDING)) != 128) {
00379          ast_log(LOG_NOTICE, "How odd, encrypted size is %d\n", res);
00380          return -1;
00381       }
00382       src += bytes;
00383       srclen -= bytes;
00384       pos += res;
00385       dst += res;
00386    }
00387    return pos;
00388 }
00389 
00390 /*!
00391  * \brief wrapper for __ast_sign_bin then base64 encode it
00392  * \see ast_sign
00393 */
00394 int AST_OPTIONAL_API_NAME(ast_sign)(struct ast_key *key, char *msg, char *sig)
00395 {
00396    unsigned char dsig[128];
00397    int siglen = sizeof(dsig), res;
00398 
00399    if (!(res = ast_sign_bin(key, msg, strlen(msg), dsig))) {
00400       /* Success -- encode (256 bytes max as documented) */
00401       ast_base64encode(sig, dsig, siglen, 256);
00402    }
00403 
00404    return res;
00405 }
00406 
00407 /*!
00408  * \brief check signature of a message
00409  * \see ast_check_signature_bin
00410 */
00411 int AST_OPTIONAL_API_NAME(ast_check_signature_bin)(struct ast_key *key, const char *msg, int msglen, const unsigned char *dsig)
00412 {
00413    unsigned char digest[20];
00414    int res;
00415 
00416    if (key->ktype != AST_KEY_PUBLIC) {
00417       /* Okay, so of course you really *can* but for our purposes
00418          we're going to say you can't */
00419       ast_log(LOG_WARNING, "Cannot check message signature with a private key\n");
00420       return -1;
00421    }
00422 
00423    /* Calculate digest of message */
00424    SHA1((unsigned char *)msg, msglen, digest);
00425 
00426    /* Verify signature */
00427    if (!(res = RSA_verify(NID_sha1, digest, sizeof(digest), (unsigned char *)dsig, 128, key->rsa))) {
00428       ast_debug(1, "Key failed verification: %s\n", key->name);
00429       return -1;
00430    }
00431 
00432    /* Pass */
00433    return 0;
00434 }
00435 
00436 /*!
00437  * \brief base64 decode then sent to __ast_check_signature_bin
00438  * \see ast_check_signature
00439 */
00440 int AST_OPTIONAL_API_NAME(ast_check_signature)(struct ast_key *key, const char *msg, const char *sig)
00441 {
00442    unsigned char dsig[128];
00443    int res;
00444 
00445    /* Decode signature */
00446    if ((res = ast_base64decode(dsig, sig, sizeof(dsig))) != sizeof(dsig)) {
00447       ast_log(LOG_WARNING, "Signature improper length (expect %d, got %d)\n", (int)sizeof(dsig), (int)res);
00448       return -1;
00449    }
00450 
00451    res = ast_check_signature_bin(key, msg, strlen(msg), dsig);
00452 
00453    return res;
00454 }
00455 
00456 int AST_OPTIONAL_API_NAME(ast_crypto_loaded)(void)
00457 {
00458    return 1;
00459 }
00460 
00461 int AST_OPTIONAL_API_NAME(ast_aes_set_encrypt_key)(const unsigned char *key, ast_aes_encrypt_key *ctx)
00462 {
00463    return AES_set_encrypt_key(key, 128, ctx);
00464 }
00465 
00466 int AST_OPTIONAL_API_NAME(ast_aes_set_decrypt_key)(const unsigned char *key, ast_aes_decrypt_key *ctx)
00467 {
00468    return AES_set_decrypt_key(key, 128, ctx);
00469 }
00470 
00471 void AST_OPTIONAL_API_NAME(ast_aes_encrypt)(const unsigned char *in, unsigned char *out, const ast_aes_encrypt_key *ctx)
00472 {
00473    return AES_encrypt(in, out, ctx);
00474 }
00475 
00476 void AST_OPTIONAL_API_NAME(ast_aes_decrypt)(const unsigned char *in, unsigned char *out, const ast_aes_decrypt_key *ctx)
00477 {
00478    return AES_decrypt(in, out, ctx);
00479 }
00480 
00481 /*!
00482  * \brief refresh RSA keys from file
00483  * \param ifd file descriptor
00484  * \param ofd file descriptor
00485  * \return void
00486 */
00487 static void crypto_load(int ifd, int ofd)
00488 {
00489    struct ast_key *key;
00490    DIR *dir = NULL;
00491    struct dirent *ent;
00492    int note = 0;
00493 
00494    AST_RWLIST_WRLOCK(&keys);
00495 
00496    /* Mark all keys for deletion */
00497    AST_RWLIST_TRAVERSE(&keys, key, list) {
00498       key->delme = 1;
00499    }
00500 
00501    /* Load new keys */
00502    if ((dir = opendir(ast_config_AST_KEY_DIR))) {
00503       while ((ent = readdir(dir))) {
00504          try_load_key(ast_config_AST_KEY_DIR, ent->d_name, ifd, ofd, &note);
00505       }
00506       closedir(dir);
00507    } else {
00508       ast_log(LOG_WARNING, "Unable to open key directory '%s'\n", ast_config_AST_KEY_DIR);
00509    }
00510 
00511    if (note) {
00512       ast_log(LOG_NOTICE, "Please run the command 'keys init' to enter the passcodes for the keys\n");
00513    }
00514 
00515    /* Delete any keys that are no longer present */
00516    AST_RWLIST_TRAVERSE_SAFE_BEGIN(&keys, key, list) {
00517       if (key->delme) {
00518          ast_debug(1, "Deleting key %s type %d\n", key->name, key->ktype);
00519          AST_RWLIST_REMOVE_CURRENT(list);
00520          if (key->rsa) {
00521             RSA_free(key->rsa);
00522          }
00523          ast_free(key);
00524       }
00525    }
00526    AST_RWLIST_TRAVERSE_SAFE_END;
00527 
00528    AST_RWLIST_UNLOCK(&keys);
00529 }
00530 
00531 static void md52sum(char *sum, unsigned char *md5)
00532 {
00533    int x;
00534    for (x = 0; x < 16; x++) {
00535       sum += sprintf(sum, "%02x", (unsigned)*(md5++));
00536    }
00537 }
00538 
00539 /*!
00540  * \brief show the list of RSA keys
00541  * \param e CLI command
00542  * \param cmd
00543  * \param a list of CLI arguments
00544  * \return CLI_SUCCESS
00545 */
00546 static char *handle_cli_keys_show(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
00547 {
00548 #define FORMAT "%-18s %-8s %-16s %-33s\n"
00549 
00550    struct ast_key *key;
00551    char sum[16 * 2 + 1];
00552    int count_keys = 0;
00553 
00554    switch (cmd) {
00555    case CLI_INIT:
00556       e->command = "keys show";
00557       e->usage =
00558          "Usage: keys show\n"
00559          "       Displays information about RSA keys known by Asterisk\n";
00560       return NULL;
00561    case CLI_GENERATE:
00562       return NULL;
00563    }
00564 
00565    ast_cli(a->fd, FORMAT, "Key Name", "Type", "Status", "Sum");
00566    ast_cli(a->fd, FORMAT, "------------------", "--------", "----------------", "--------------------------------");
00567 
00568    AST_RWLIST_RDLOCK(&keys);
00569    AST_RWLIST_TRAVERSE(&keys, key, list) {
00570       md52sum(sum, key->digest);
00571       ast_cli(a->fd, FORMAT, key->name,
00572          (key->ktype & 0xf) == AST_KEY_PUBLIC ? "PUBLIC" : "PRIVATE",
00573          key->ktype & KEY_NEEDS_PASSCODE ? "[Needs Passcode]" : "[Loaded]", sum);
00574       count_keys++;
00575    }
00576    AST_RWLIST_UNLOCK(&keys);
00577 
00578    ast_cli(a->fd, "\n%d known RSA keys.\n", count_keys);
00579 
00580    return CLI_SUCCESS;
00581 
00582 #undef FORMAT
00583 }
00584 
00585 /*!
00586  * \brief initialize all RSA keys
00587  * \param e CLI command
00588  * \param cmd
00589  * \param a list of CLI arguments
00590  * \return CLI_SUCCESS
00591 */
00592 static char *handle_cli_keys_init(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
00593 {
00594    struct ast_key *key;
00595    int ign;
00596    char *kn, tmp[256] = "";
00597 
00598    switch (cmd) {
00599    case CLI_INIT:
00600       e->command = "keys init";
00601       e->usage =
00602          "Usage: keys init\n"
00603          "       Initializes private keys (by reading in pass code from\n"
00604          "       the user)\n";
00605       return NULL;
00606    case CLI_GENERATE:
00607       return NULL;
00608    }
00609 
00610    if (a->argc != 2) {
00611       return CLI_SHOWUSAGE;
00612    }
00613 
00614    AST_RWLIST_WRLOCK(&keys);
00615    AST_RWLIST_TRAVERSE_SAFE_BEGIN(&keys, key, list) {
00616       /* Reload keys that need pass codes now */
00617       if (key->ktype & KEY_NEEDS_PASSCODE) {
00618          kn = key->fn + strlen(ast_config_AST_KEY_DIR) + 1;
00619          ast_copy_string(tmp, kn, sizeof(tmp));
00620          try_load_key(ast_config_AST_KEY_DIR, tmp, a->fd, a->fd, &ign);
00621       }
00622    }
00623    AST_RWLIST_TRAVERSE_SAFE_END
00624    AST_RWLIST_UNLOCK(&keys);
00625 
00626    return CLI_SUCCESS;
00627 }
00628 
00629 static struct ast_cli_entry cli_crypto[] = {
00630    AST_CLI_DEFINE(handle_cli_keys_show, "Displays RSA key information"),
00631    AST_CLI_DEFINE(handle_cli_keys_init, "Initialize RSA key passcodes")
00632 };
00633 
00634 /*! \brief initialise the res_crypto module */
00635 static int crypto_init(void)
00636 {
00637    ast_cli_register_multiple(cli_crypto, ARRAY_LEN(cli_crypto));
00638    return 0;
00639 }
00640 
00641 static int reload(void)
00642 {
00643    crypto_load(-1, -1);
00644    return 0;
00645 }
00646 
00647 static int load_module(void)
00648 {
00649    crypto_init();
00650    if (ast_opt_init_keys) {
00651       crypto_load(STDIN_FILENO, STDOUT_FILENO);
00652    } else {
00653       crypto_load(-1, -1);
00654    }
00655    return AST_MODULE_LOAD_SUCCESS;
00656 }
00657 
00658 static int unload_module(void)
00659 {
00660    /* Can't unload this once we're loaded */
00661    return -1;
00662 }
00663 
00664 /* needs usecount semantics defined */
00665 AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_GLOBAL_SYMBOLS | AST_MODFLAG_LOAD_ORDER, "Cryptographic Digital Signatures",
00666       .load = load_module,
00667       .unload = unload_module,
00668       .reload = reload,
00669       .load_pri = AST_MODPRI_CHANNEL_DEPEND, /*!< Since we don't have a config file, we could move up to REALTIME_DEPEND, if necessary */
00670    );

Generated on 31 Aug 2015 for Asterisk - The Open Source Telephony Project by  doxygen 1.6.1