1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938
|
/* NSS keys for the Pidgin-Encryption plugin */
/* Copyright (C) 2001 William Tompkins */
/* This plugin is free software, distributed under the GNU General Public */
/* License. */
/* Please see the file "COPYING" distributed with this source code */
/* for more details */
/* */
/* */
/* This software is distributed in the hope that it will be useful, */
/* but WITHOUT ANY WARRANTY; without even the implied warranty of */
/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU */
/* General Public License for more details. */
/* To compile and use: */
/* See INSTALL file. */
#include "internal.h"
#include <gdk/gdk.h>
#include <gtk/gtk.h>
#include <gtk/gtkplug.h>
#include <debug.h>
#include <gtkdialogs.h>
#include "glib/gmain.h"
#include <string.h>
#include <assert.h>
#ifdef _WIN32
#include "win32dep.h"
#endif
#include "rsa_nss.h"
#include <nspr.h>
#include <nss.h>
#include <ssl.h>
#include <secmod.h>
#include <pk11func.h>
#include <keyhi.h>
#include <nssb64.h>
#include "nls.h"
#include "nss_mgf1.h"
#include "nss_oaep.h"
#include "nss_pss.h"
#include "cryptutil.h"
#include "keys.h"
#include "cryptproto.h"
#include "state_ui.h"
char* rsa_nss_proto_string="NSS 1.0";
crypt_proto* rsa_nss_proto;
/*Functions exported through crypt_proto structure */
static int rsa_nss_encrypt(unsigned char**, unsigned char*, int, crypt_key*);
static int rsa_nss_decrypt(unsigned char**, unsigned char*, int, crypt_key*);
static int rsa_nss_sign(unsigned char**, unsigned char*, int, crypt_key*, crypt_key*);
static int rsa_nss_auth(unsigned char**, unsigned char*, int, crypt_key*, const char* name);
static crypt_key* rsa_nss_make_key_from_str(char *key_str);
static GString* rsa_nss_key_to_gstr(crypt_key* inkey);
static char* rsa_nss_parseable(char* key);
static crypt_key* rsa_nss_parse_sent_key(char *key_str);
static GString* rsa_nss_make_sendable_key(crypt_key* inkey, const char* name);
static gchar* rsa_nss_make_key_id(crypt_key* inkey);
void rsa_nss_gen_key_pair(crypt_key **, crypt_key **,
const char* name, int keysize);
static void rsa_nss_free(crypt_key*);
static crypt_key* rsa_nss_make_pub_from_priv(crypt_key* priv);
static int rsa_nss_calc_unencrypted_size(struct crypt_key*, int);
static int rsa_nss_calc_unsigned_size(struct crypt_key*, int);
/* internals */
void rsa_nss_test(crypt_key *pub, crypt_key *priv);
gboolean rsa_nss_init() {
gboolean nss_loaded_ok = FALSE;
PurplePlugin *plugin = purple_plugins_find_with_name("NSS");
if (plugin != NULL) {
nss_loaded_ok = purple_plugin_is_loaded(plugin);
if (!nss_loaded_ok) {
nss_loaded_ok = purple_plugin_load(plugin);
}
}
if (!nss_loaded_ok) {
purple_debug(PURPLE_DEBUG_ERROR, "pidgin-encryption", "Initializing NSS without Purple support\n");
/* Purple doesn't seem to have NSS support: try to load it ourselves: */
PR_Init(PR_SYSTEM_THREAD, PR_PRIORITY_NORMAL, 1);
NSS_NoDB_Init(NULL);
/* TODO: Fix this so autoconf does the work trying to find this lib. */
SECMOD_AddNewModule("Builtins",
#ifndef _WIN32
"libnssckbi.so",
#else
"nssckbi.dll",
#endif
0, 0);
NSS_SetDomesticPolicy();
/* purple_debug(PURPLE_DEBUG_ERROR, "pidgin-encryption", _("Can't load the NSS plugin\n")); */
/* PE_error_window(_("Purple was not compiled with the NSS plugin enabled. " */
/* "Pidgin-Encryption requires the NSS plugin to function.")); */
/* return FALSE; */
}
rsa_nss_proto = g_malloc(sizeof(crypt_proto));
crypt_proto_list = g_slist_prepend(crypt_proto_list, rsa_nss_proto);
rsa_nss_proto->encrypt = rsa_nss_encrypt;
rsa_nss_proto->decrypt = rsa_nss_decrypt;
rsa_nss_proto->sign = rsa_nss_sign;
rsa_nss_proto->auth = rsa_nss_auth;
rsa_nss_proto->make_key_from_str = rsa_nss_make_key_from_str;
rsa_nss_proto->key_to_gstr = rsa_nss_key_to_gstr;
rsa_nss_proto->parseable = rsa_nss_parseable;
rsa_nss_proto->parse_sent_key = rsa_nss_parse_sent_key;
rsa_nss_proto->make_sendable_key = rsa_nss_make_sendable_key;
rsa_nss_proto->make_key_id = rsa_nss_make_key_id;
rsa_nss_proto->gen_key_pair = rsa_nss_gen_key_pair;
rsa_nss_proto->free = rsa_nss_free;
rsa_nss_proto->make_pub_from_priv = rsa_nss_make_pub_from_priv;
rsa_nss_proto->calc_unencrypted_size = rsa_nss_calc_unencrypted_size;
rsa_nss_proto->calc_unsigned_size = rsa_nss_calc_unsigned_size;
rsa_nss_proto->name = rsa_nss_proto_string;
return TRUE;
}
static void rsa_nss_free(crypt_key* key){
if (key->store.rsa_nss.pub) {
SECKEY_DestroyPublicKey(key->store.rsa_nss.pub);
key->store.rsa_nss.pub = 0;
}
if (key->store.rsa_nss.priv) {
SECKEY_DestroyPrivateKey(key->store.rsa_nss.priv);
key->store.rsa_nss.priv = 0;
}
}
static SECItem*
get_random_iv(CK_MECHANISM_TYPE mechType)
{
int iv_size = PK11_GetIVLength(mechType);
SECItem *iv;
SECStatus rv;
iv = PORT_ZNew(SECItem);
g_assert(iv != 0);
g_assert(iv_size != 0);
iv->data = PORT_NewArray(unsigned char, iv_size);
g_assert(iv->data != 0);
iv->len = iv_size;
rv = PK11_GenerateRandom(iv->data, iv->len);
g_assert(rv == SECSuccess);
return iv;
}
static void generate_digest(char* digest, SECKEYPublicKey* key) {
SECItem *hash = PK11_MakeIDFromPubKey(&key->u.rsa.modulus);
int i = 0, digestPos = 0;
while (i < hash->len && digestPos < KEY_DIGEST_LENGTH) {
sprintf(digest + digestPos, "%02x", hash->data[i]);
++i;
digestPos += 2;
}
SECITEM_ZfreeItem (hash, PR_TRUE);
}
static void generate_fingerprint(char* print, SECKEYPublicKey* key) {
SECItem *hash = PK11_MakeIDFromPubKey(&key->u.rsa.modulus);
int i;
for (i= 0; i < hash->len - 1; ++i) {
sprintf(print + (3*i), "%02x:", hash->data[i]);
}
sprintf(print + 3 * (hash->len - 1), "%02x", hash->data[(hash->len - 1)]);
SECITEM_ZfreeItem (hash, PR_TRUE);
}
static SECKEYPublicKey *
copy_public_rsa_key(SECKEYPublicKey *pubk) {
SECKEYPublicKey *copyk;
PRArenaPool *arena;
SECStatus rv;
arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
g_assert(arena != NULL);
copyk = (SECKEYPublicKey *) PORT_ArenaZAlloc (arena, sizeof (SECKEYPublicKey));
g_assert(copyk != NULL);
copyk->arena = arena;
copyk->keyType = pubk->keyType;
copyk->pkcs11Slot = NULL; /* go get own reference */
copyk->pkcs11ID = CK_INVALID_HANDLE;
rv = SECITEM_CopyItem(arena, ©k->u.rsa.modulus,
&pubk->u.rsa.modulus);
g_assert(rv == SECSuccess);
rv = SECITEM_CopyItem (arena, ©k->u.rsa.publicExponent,
&pubk->u.rsa.publicExponent);
g_assert(rv == SECSuccess);
return copyk;
}
void rsa_nss_gen_key_pair(crypt_key **pub_key, crypt_key **priv_key,
const char* name, int keysize) {
GtkWidget *status_window, *main_box, *label1, *label2;
char labelText[1000];
PK11RSAGenParams rsaParams;
PK11SlotInfo *slot;
CK_MECHANISM_TYPE multiType[2] = {CKM_RSA_PKCS_KEY_PAIR_GEN, CKM_DES_CBC_PAD};
/* Create the widgets */
PIDGIN_DIALOG(status_window);
gtk_window_set_wmclass(GTK_WINDOW(status_window), "keygen", "Pidgin");
gtk_widget_realize(status_window);
gtk_container_set_border_width(GTK_CONTAINER(status_window), 10);
gtk_widget_set_size_request(status_window, 350, 100);
gtk_window_set_title(GTK_WINDOW(status_window), "Status");
main_box = gtk_vbox_new(FALSE, 0);
gtk_container_add(GTK_CONTAINER(status_window), main_box);
gtk_widget_show(main_box);
g_snprintf(labelText, sizeof(labelText), _("Generating RSA Key Pair for %s"),
name);
label1 = gtk_label_new (labelText);
label2 = gtk_label_new (_("This may take a little bit..."));
gtk_container_add (GTK_CONTAINER (main_box), label1);
gtk_widget_show(label1);
gtk_container_add (GTK_CONTAINER (main_box), label2);
gtk_widget_show(label2);
gtk_widget_show (status_window);
// I don't understand: if I remove one of these
// two loops, the contents of the status window don't
// get drawn. Hmm...
while (gtk_events_pending()) {
gtk_main_iteration_do(FALSE);
}
gtk_main_iteration();
while (gtk_events_pending()) {
gtk_main_iteration_do(FALSE);
}
*priv_key = g_malloc(sizeof(crypt_key));
rsaParams.keySizeInBits = keysize;
rsaParams.pe = 65537L;
slot = PK11_GetBestSlotMultiple(multiType, 2, 0);
/* Generate "session" (first FALSE), "not sensitive" (next FALSE) key */
(*priv_key)->store.rsa_nss.priv =
PK11_GenerateKeyPair(slot, CKM_RSA_PKCS_KEY_PAIR_GEN, &rsaParams,
&(*priv_key)->store.rsa_nss.pub,
PR_FALSE, PR_FALSE, 0);
if (!(*priv_key)->store.rsa_nss.priv) {
purple_debug(PURPLE_DEBUG_ERROR, "pidgin-encryption",
_("Could not generate key. NSS Error: %d\n"),
PORT_GetError());
exit(0);
}
(*priv_key)->proto = rsa_nss_proto;
g_snprintf((*priv_key)->length, sizeof((*priv_key)->length), "%d", keysize);
generate_digest((*priv_key)->digest, (*priv_key)->store.rsa_nss.pub);
generate_fingerprint((*priv_key)->fingerprint, (*priv_key)->store.rsa_nss.pub);
(*pub_key) = rsa_nss_make_pub_from_priv(*priv_key);
gtk_widget_hide(status_window);
gtk_widget_destroy(status_window);
}
char* rsa_nss_parseable(char *key) {
/* If the key is ours, return a pointer to the ':' after our token */
/* otherwise return 0 */
/* if we were more sophisticated, we could look for older versions */
/* of our protocol here, and accept them too. */
if (strncmp(rsa_nss_proto_string, key, strlen(rsa_nss_proto_string)) == 0) {
return key + strlen(rsa_nss_proto_string);
} else {
return 0;
}
}
static GString* append_priv_key_to_gstr(GString *str, SECKEYPrivateKey* priv) {
/* for now, we hope that everyone can use DES3. This is for wrapping */
/* private keys, which isn't actually secure at this point anyways */
/* (security provided by the OS: no one else can read/write the keyfile */
const CK_MECHANISM_TYPE SymEncryptionType = CKM_DES3_CBC_PAD;
PK11SlotInfo *symSlot;
PK11SymKey *symKey;
SECItem symKeyItem; /* storage space for binary key import */
unsigned char symKeyData[24] = {0};
SECItem *iv = NULL; /* IV for CBC encoding */
SECItem exportedKey; /* storage space for exported key */
unsigned char exportedKeyData[5000] = {0};
char* tmpstr;
int errCode;
if (priv == 0) return str;
/* Wrap key using a null symmetric key. When/If we add password protection to
keys, we can generate the symmetric key from a hashed password instead */
symSlot = PK11_GetBestSlot(SymEncryptionType, NULL);
g_assert(symSlot != 0);
symKeyItem.data = &symKeyData[0];
symKeyItem.len = sizeof(symKeyData);
symKey = PK11_ImportSymKey(symSlot, PK11_GetKeyGen(SymEncryptionType),
PK11_OriginUnwrap, CKA_WRAP, &symKeyItem, NULL);
iv = get_random_iv(SymEncryptionType);
exportedKey.len = sizeof(exportedKeyData);
exportedKey.data = exportedKeyData;
errCode = PK11_WrapPrivKey(symSlot, symKey, priv, SymEncryptionType, iv,
&exportedKey, NULL);
g_assert(errCode == SECSuccess);
g_string_append(str, ",");
tmpstr = NSSBase64_EncodeItem(0, 0, 0, iv);
g_string_append(str, tmpstr);
PORT_Free(tmpstr);
g_string_append(str, ",");
tmpstr = NSSBase64_EncodeItem(0, 0, 0, &exportedKey);
g_string_append(str, tmpstr);
PORT_Free(tmpstr);
g_string_append(str, ",");
PK11_FreeSymKey(symKey);
SECITEM_ZfreeItem(iv, PR_TRUE);
/* The Base64 routine may have inserted lots of return chars into the string: */
/* take them out. */
PE_strip_returns(str);
return str;
}
static GString* append_pub_key_to_gstr(GString *str, SECKEYPublicKey* pub) {
char *tmpstr;
SECItem *exportedKey;
if (pub == 0) return str;
exportedKey = SECKEY_EncodeDERSubjectPublicKeyInfo(pub);
// exportedKey = PK11_DEREncodePublicKey(pub);
tmpstr = NSSBase64_EncodeItem(0, 0, 0, exportedKey);
g_string_append(str, tmpstr);
PORT_Free(tmpstr);
SECITEM_FreeItem (exportedKey, PR_TRUE);
/* The Base64 routine may have inserted lots of return chars into the string: take them out. */
PE_strip_returns(str);
return str;
}
GString* rsa_nss_make_sendable_key(crypt_key* inkey, const char* name) {
GString *outString = g_string_new("");
gchar* nonce_str = PE_new_incoming_nonce(name);
g_string_append(outString, nonce_str);
purple_debug(PURPLE_DEBUG_INFO, "pidgin-encryption", "Sending Nonce with key: %s\n", nonce_str);
g_free(nonce_str);
g_string_append(outString, ",");
append_pub_key_to_gstr(outString, inkey->store.rsa_nss.pub);
return outString;
}
gchar* rsa_nss_make_key_id(crypt_key* inkey) {
return PE_nonce_to_str(&inkey->store.rsa_nss.nonce);
}
crypt_key* rsa_nss_parse_sent_key(char *key_str) {
gchar** split_key = g_strsplit(key_str, ",", 2);
crypt_key* key;
if ((split_key[0] == 0) || (split_key[1] == 0)) {
purple_debug(PURPLE_DEBUG_ERROR, "pidgin-encryption", "Error parsing RSANSS nonce/key\n");
g_strfreev(split_key);
return 0;
}
key = rsa_nss_make_key_from_str(split_key[1]);
if (key == 0) {
g_strfreev(split_key);
return 0;
}
PE_str_to_nonce(&key->store.rsa_nss.nonce, split_key[0]);
purple_debug(PURPLE_DEBUG_INFO, "pidgin-encryption", "Received Nonce with key: %s\n", split_key[0]);
g_strfreev(split_key);
return key;
}
GString* rsa_nss_key_to_gstr(crypt_key* inkey) {
GString *outString = g_string_new("");
append_pub_key_to_gstr(outString, inkey->store.rsa_nss.pub);
append_priv_key_to_gstr(outString, inkey->store.rsa_nss.priv);
return outString;
}
crypt_key* rsa_nss_make_key_from_str(char *key_str){
gchar **split_key;
crypt_key* key = g_malloc(sizeof(crypt_key));
/* For Private keys: */
const CK_MECHANISM_TYPE SymEncryptionType = CKM_DES3_CBC_PAD;
PK11SlotInfo *symSlot;
PK11SymKey *symKey;
SECItem *pubKeyValue;
SECItem symKeyItem; /* storage space for binary key import */
unsigned char symKeyData[24] = {0};
SECItem *iv = 0, *wrappedKey = 0, label;
CK_ATTRIBUTE_TYPE attribs[3] = { CKA_SIGN, CKA_DECRYPT, CKA_SIGN_RECOVER };
const int NumAttribs = 3;
int cur_piece;
CERTSubjectPublicKeyInfo *certPubKeyInfo;
/* key_str looks like "KKKKK" or "KKKKK,NNNN,MMMM", where */
/* KKKKK is the Base64 encoding of the public key, or */
/* NNNN is the Base64 encoding of the IV, and */
/* MMMM is the Base64 encoding of the encrypted private key */
key->proto = rsa_nss_proto;
split_key = g_strsplit(key_str, ",", 3);
key->store.rsa_nss.pub = 0;
key->store.rsa_nss.priv = 0;
cur_piece = 0;
// Check for public key part, and get it:
if (split_key[cur_piece] == 0) {
purple_debug(PURPLE_DEBUG_ERROR, "pidgin-encryption", "(%d) %s",
1, _("Error parsing RSANSS key\n"));
g_free(key);
g_strfreev(split_key);
return 0;
}
wrappedKey = NSSBase64_DecodeBuffer(0, 0, split_key[cur_piece], strlen(split_key[cur_piece]));
if (wrappedKey == 0) {
purple_debug(PURPLE_DEBUG_ERROR, "pidgin-encryption", "(%d) %s",
2, _("Error parsing RSANSS key\n"));
g_free(key);
g_strfreev(split_key);
return 0;
}
certPubKeyInfo = SECKEY_DecodeDERSubjectPublicKeyInfo(wrappedKey);
SECITEM_FreeItem(wrappedKey, PR_TRUE);
if (certPubKeyInfo == NULL) {
purple_debug(PURPLE_DEBUG_ERROR, "pidgin-encryption", "(%d) %s",
3, _("Error parsing RSANSS key\n"));
g_free(key);
g_strfreev(split_key);
return 0;
}
key->store.rsa_nss.pub = SECKEY_ExtractPublicKey(certPubKeyInfo);
if (key->store.rsa_nss.pub == NULL) {
purple_debug(PURPLE_DEBUG_ERROR, "pidgin-encryption", "(%d) %s",
4, _("Error parsing RSANSS key\n"));
g_free(key);
g_strfreev(split_key);
return 0;
}
SECKEY_DestroySubjectPublicKeyInfo(certPubKeyInfo);
generate_digest(key->digest, key->store.rsa_nss.pub);
generate_fingerprint(key->fingerprint, key->store.rsa_nss.pub);
g_snprintf(key->length, sizeof(key->length), "%d",
8 * SECKEY_PublicKeyStrength(key->store.rsa_nss.pub));
if (split_key[++cur_piece] == 0) {
/* No private part, so return a public key: */
g_strfreev(split_key);
return key;
}
/* ------------------------------------------------------------------------ */
/* Extract Private key: */
/* */
iv = NSSBase64_DecodeBuffer(0, 0, split_key[cur_piece],
strlen(split_key[cur_piece]));
if (split_key[++cur_piece] == 0) {
/* only part of a private key */
purple_debug(PURPLE_DEBUG_ERROR, "pidgin-encryption", "(%d) %s",
5, _("Error parsing RSANSS key\n"));
g_free(key);
g_strfreev(split_key);
/* SECItem_FreeItem will ignore null arguments, so just call it to clean up */
SECITEM_ZfreeItem (iv, PR_TRUE);
return 0;
}
wrappedKey = NSSBase64_DecodeBuffer(0, 0, split_key[cur_piece],
strlen(split_key[cur_piece]));
if ((iv == 0) || (wrappedKey == 0)) {
purple_debug(PURPLE_DEBUG_ERROR, "pidgin-encryption", "(%d) %s",
6, _("Error parsing RSANSS key\n"));
g_free(key);
g_strfreev(split_key);
SECITEM_ZfreeItem (iv, PR_TRUE);
SECITEM_ZfreeItem (wrappedKey, PR_TRUE);
return 0;
}
pubKeyValue = SECITEM_DupItem(&key->store.rsa_nss.pub->u.rsa.modulus);
symSlot = PK11_GetBestSlot(SymEncryptionType, NULL);
g_assert(symSlot != 0);
symKeyItem.data = &symKeyData[0];
symKeyItem.len = sizeof(symKeyData);
symKey = PK11_ImportSymKey(symSlot, PK11_GetKeyGen(SymEncryptionType),
PK11_OriginUnwrap, CKA_WRAP, &symKeyItem, NULL);
if (!symKey) {
purple_debug(PURPLE_DEBUG_ERROR, "pidgin-encryption", "(%d) %s",
7, _("Error parsing RSANSS key\n"));
g_strfreev(split_key);
SECKEY_DestroyPublicKey(key->store.rsa_nss.pub);
SECITEM_ZfreeItem (iv, PR_TRUE);
SECITEM_ZfreeItem (pubKeyValue, PR_TRUE);
g_free(key);
return 0;
}
label.data = NULL; label.len = 0;
key->store.rsa_nss.priv =
PK11_UnwrapPrivKey(symSlot, symKey, SymEncryptionType, iv,
wrappedKey, &label, pubKeyValue,
PR_FALSE, PR_FALSE, CKK_RSA, attribs, NumAttribs, 0);
SECITEM_ZfreeItem (iv, PR_TRUE);
SECITEM_ZfreeItem (wrappedKey, PR_TRUE);
SECITEM_FreeItem (pubKeyValue, PR_TRUE);
PK11_FreeSymKey(symKey);
if (key->store.rsa_nss.priv == 0) {
purple_debug(PURPLE_DEBUG_ERROR, "pidgin-encryption", "(%d) %s",
8, _("Error parsing RSANSS key\n"));
g_strfreev(split_key);
SECKEY_DestroyPublicKey(key->store.rsa_nss.pub);
g_free(key);
return 0;
}
/* should sanity check public/private pair */
g_strfreev(split_key);
return key;
}
crypt_key* rsa_nss_make_pub_from_priv(crypt_key* priv_key) {
crypt_key* pub_key = g_malloc(sizeof(crypt_key));
pub_key->proto = rsa_nss_proto;
strcpy(pub_key->length, priv_key->length);
strncpy(pub_key->digest, priv_key->digest, KEY_DIGEST_LENGTH);
strncpy(pub_key->fingerprint, priv_key->fingerprint, KEY_FINGERPRINT_LENGTH);
pub_key->store.rsa_nss.pub = copy_public_rsa_key(priv_key->store.rsa_nss.pub);
pub_key->store.rsa_nss.priv = 0;
return pub_key;
}
int rsa_nss_encrypt(unsigned char** encrypted, unsigned char* msg, int msg_len,
crypt_key* pub_key){
SECKEYPublicKey * key = pub_key->store.rsa_nss.pub;
int modulus_len = SECKEY_PublicKeyStrength(key);
int unpadded_block_len = oaep_max_unpadded_len(modulus_len);
int num_blocks = ((msg_len - 1) / unpadded_block_len) + 1;
unsigned char* msg_cur, *encrypt_cur;
int msg_block_len;
unsigned char *padded_block = g_malloc(modulus_len);
int ret;
SECStatus rv;
// purple_debug(PURPLE_DEBUG_INFO, "pidgin-encryption", "Starting Encrypt\n");
*encrypted = g_malloc(num_blocks * modulus_len);
msg_cur = msg;
encrypt_cur = *encrypted;
while (msg_cur < msg + msg_len) {
msg_block_len = unpadded_block_len;
if (msg_cur + msg_block_len > msg + msg_len) {
msg_block_len = msg + msg_len - msg_cur;
}
ret = oaep_pad_block(padded_block, modulus_len, msg_cur, msg_block_len);
if (!ret) {
g_free(padded_block);
g_free(*encrypted);
*encrypted = 0;
return 0;
}
rv = PK11_PubEncryptRaw(key, encrypt_cur, padded_block,
modulus_len, 0);
if (rv != SECSuccess) {
g_free(padded_block);
g_free(*encrypted);
*encrypted = 0;
return 0;
}
msg_cur += msg_block_len;
encrypt_cur += modulus_len;
}
g_free(padded_block);
// purple_debug(PURPLE_DEBUG_INFO, "pidgin-encryption", "Ending Encrypt\n");
return (encrypt_cur - *encrypted);
}
int rsa_nss_decrypt(unsigned char** decrypted, unsigned char* msg, int msg_len,
crypt_key* priv_key){
SECKEYPrivateKey * key = priv_key->store.rsa_nss.priv;
int modulus_len = SECKEY_PublicKeyStrength(priv_key->store.rsa_nss.pub);
int unpadded_block_len = oaep_max_unpadded_len(modulus_len);
int num_blocks = msg_len / modulus_len;
unsigned char* msg_cur, *decrypt_cur;
unsigned int decrypt_block_size;
unsigned char *padded_block = g_malloc(modulus_len);
int ret;
SECStatus rv;
purple_debug(PURPLE_DEBUG_INFO, "pidgin-encryption", "Starting Decrypt\n");
*decrypted = g_malloc(num_blocks * unpadded_block_len + 1);
msg_cur = msg;
decrypt_cur = *decrypted;
if (num_blocks * modulus_len != msg_len) { /* not an even number of blocks */
purple_debug(PURPLE_DEBUG_ERROR, "pidgin-encryption", "Not a multiple of block len: %d %d %d\n",
num_blocks, modulus_len, msg_len);
g_free(padded_block);
g_free(*decrypted);
*decrypted = 0;
return 0;
}
while (msg_cur < msg + msg_len) {
rv = PK11_PubDecryptRaw(key, padded_block, &decrypt_block_size, modulus_len,
msg_cur, modulus_len);
if (rv != SECSuccess) {
purple_debug(PURPLE_DEBUG_ERROR, "pidgin-encryption", "PubDecryptRaw failed %d\n", rv);
g_free(padded_block);
g_free(*decrypted);
*decrypted = 0;
return 0;
}
g_assert(decrypt_block_size == modulus_len); /* for now. Don't understand how */
/* this could not be true */
ret = oaep_unpad_block(decrypt_cur, &decrypt_block_size, padded_block, modulus_len);
if (!ret) {
purple_debug(PURPLE_DEBUG_ERROR, "pidgin-encryption", "OAEP unpadding failed\n");
g_free(padded_block);
g_free(*decrypted);
*decrypted = 0;
return 0;
}
msg_cur += modulus_len;
decrypt_cur += decrypt_block_size;
}
g_free(padded_block);
/* Null terminate what just came out, in case someone tries to use it as a string */
*decrypt_cur = 0;
// purple_debug(PURPLE_DEBUG_INFO, "pidgin-encryption", "Ending Decrypt\n");
return (decrypt_cur - *decrypted);
}
int rsa_nss_sign(unsigned char** signed_msg, unsigned char* msg, int msg_len,
crypt_key* priv_key, crypt_key* pub_key) {
SECKEYPrivateKey * key = priv_key->store.rsa_nss.priv;
int modulus_len = SECKEY_PublicKeyStrength(priv_key->store.rsa_nss.pub);
unsigned char *sig_pos, *tmp_sig;
SECStatus rv;
unsigned int out_block_size;
const int salt_len = 20;
gchar *nonce_str = PE_nonce_to_str(&pub_key->store.rsa_nss.nonce);
int nonce_len = strlen(nonce_str);
PE_incr_nonce(&pub_key->store.rsa_nss.nonce);
*signed_msg = g_malloc(msg_len + modulus_len + nonce_len + 1);
tmp_sig = g_malloc(modulus_len);
memcpy(*signed_msg, nonce_str, nonce_len);
(*signed_msg)[nonce_len]=':';
memcpy(*signed_msg + nonce_len + 1, msg, msg_len);
sig_pos = *signed_msg + msg_len + nonce_len + 1 ;
g_free(nonce_str);
pss_generate_sig(tmp_sig, modulus_len, *signed_msg, msg_len + nonce_len + 1, salt_len);
rv = PK11_PubDecryptRaw(key, sig_pos, &out_block_size, modulus_len,
tmp_sig, modulus_len);
if (rv != SECSuccess) {
purple_debug(PURPLE_DEBUG_ERROR, "pidgin-encryption", "PK11_PubDecryptRaw Failed\n");
g_free(*signed_msg);
g_free(tmp_sig);
*signed_msg = 0;
return 0;
}
g_assert(out_block_size == modulus_len); /* dunno why they yield out_block_size */
g_free(tmp_sig);
return msg_len + nonce_len + 1 + modulus_len;
}
// Returns length of authed string, or 0 if not authenticated
// g_malloc's space for the authed string, and null terminates the result
// If returning zero, may return a message ID (nonce) as the authed string
int rsa_nss_auth(unsigned char** authed, unsigned char* msg, int msg_len,
crypt_key* pub_key, const char* name) {
SECKEYPublicKey * key = pub_key->store.rsa_nss.pub;
int modulus_len = SECKEY_PublicKeyStrength(key);
unsigned char *tmp_sig;
SECStatus rv;
int verified;
gchar *nonce_msg, **nonce_msg_split;
purple_debug(PURPLE_DEBUG_INFO, "pidgin-encryption", "Starting Auth\n");
*authed = 0;
if (msg_len < modulus_len) {
purple_debug(PURPLE_DEBUG_ERROR, "pidgin-encryption", "Bad msg_len in Auth\n");
return 0;
}
tmp_sig = g_malloc(modulus_len);
rv = PK11_PubEncryptRaw(key, tmp_sig, msg + msg_len - modulus_len,
modulus_len, 0);
if (rv != SECSuccess) {
purple_debug(PURPLE_DEBUG_ERROR, "pidgin-encryption", "PK11_PubEncryptRaw Failed\n");
g_free(tmp_sig);
return 0;
}
/* purple_debug(PURPLE_DEBUG_INFO, "pidgin-encryption", "Auth 2\n"); */
verified = pss_check_sig(tmp_sig, modulus_len, msg, msg_len - modulus_len);
g_free(tmp_sig);
if (!verified) {
purple_debug(PURPLE_DEBUG_ERROR, "pidgin-encryption", _("Bad signature on message (len %d, mod %d)\n"),
msg_len, modulus_len);
return 0;
}
/* purple_debug(PURPLE_DEBUG_INFO, "pidgin-encryption", "Auth 3\n"); */
nonce_msg = g_strndup((char*)msg, msg_len - modulus_len);
nonce_msg_split = g_strsplit(nonce_msg, ":", 2);
g_free(nonce_msg);
/* purple_debug(PURPLE_DEBUG_INFO, "pidgin-encryption", "Auth 4\n"); */
if ((nonce_msg_split[0] == 0) || (nonce_msg_split[1] == 0)) {
purple_debug(PURPLE_DEBUG_ERROR, "pidgin-encryption", "No Nonce in message\n");
g_strfreev(nonce_msg_split);
return 0;
}
/* purple_debug(PURPLE_DEBUG_INFO, "pidgin-encryption", "Auth 5\n"); */
if (!PE_check_incoming_nonce(name, nonce_msg_split[0])) {
purple_debug(PURPLE_DEBUG_ERROR, "pidgin-encryption", "Bad Nonce in message\n");
/* a hack: return the nonce that was sent, to send to other side, to cause */
/* message to be re-sent */
*authed = (unsigned char*) g_strdup(nonce_msg_split[0]);
g_strfreev(nonce_msg_split);
return 0;
}
/* purple_debug(PURPLE_DEBUG_INFO, "pidgin-encryption", "Auth 6\n"); */
*authed = (unsigned char*)nonce_msg_split[1];
g_free(nonce_msg_split[0]);
g_free(nonce_msg_split);
purple_debug(PURPLE_DEBUG_INFO, "pidgin-encryption", "Auth End\n");
return strlen((char*)*authed);
}
int rsa_nss_calc_unencrypted_size(struct crypt_key* key, int insize) {
int modulus_len = SECKEY_PublicKeyStrength(key->store.rsa_nss.pub);
int unpadded_block_len = oaep_max_unpadded_len(modulus_len);
int num_blocks = insize / modulus_len; /* floor: max number of blocks that could fit */
return num_blocks * unpadded_block_len;
}
int rsa_nss_calc_unsigned_size(struct crypt_key* key, int insize) {
int modulus_len, nonce_len;
purple_debug(PURPLE_DEBUG_INFO, "pidgin-encryption", "calc_unsigned_size\n");
modulus_len = SECKEY_PublicKeyStrength(key->store.rsa_nss.pub);
nonce_len = PE_nonce_str_len();
purple_debug(PURPLE_DEBUG_INFO, "pidgin-encryption", "modulus_len:%d:%d\n", modulus_len, nonce_len);
if (insize < modulus_len + nonce_len) return 0;
return insize - modulus_len - nonce_len - 1; /* -1 from ":" after nonce */
}
|