2
* WPA Supplicant / Crypto wrapper for LibTomCrypt (for internal TLSv1)
3
* Copyright (c) 2005-2006, Jouni Malinen <j@w1.fi>
5
* This program is free software; you can redistribute it and/or modify
6
* it under the terms of the GNU General Public License version 2 as
7
* published by the Free Software Foundation.
9
* Alternatively, this software may be distributed under the terms of BSD
12
* See README and COPYING for more details.
23
#define mp_init_multi ltc_init_multi
24
#define mp_clear_multi ltc_deinit_multi
25
#define mp_unsigned_bin_size(a) ltc_mp.unsigned_size(a)
26
#define mp_to_unsigned_bin(a, b) ltc_mp.unsigned_write(a, b)
27
#define mp_read_unsigned_bin(a, b, c) ltc_mp.unsigned_read(a, b, c)
28
#define mp_exptmod(a,b,c,d) ltc_mp.exptmod(a,b,c,d)
32
void md4_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac)
38
for (i = 0; i < num_elem; i++)
39
md4_process(&md, addr[i], len[i]);
44
void des_encrypt(const u8 *clear, const u8 *key, u8 *cypher)
46
u8 pkey[8], next, tmp;
50
/* Add parity bits to the key */
52
for (i = 0; i < 7; i++) {
54
pkey[i] = (tmp >> i) | next | 1;
55
next = tmp << (7 - i);
59
des_setup(pkey, 8, 0, &skey);
60
des_ecb_encrypt(clear, cypher, &skey);
66
void md5_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac)
72
for (i = 0; i < num_elem; i++)
73
md5_process(&md, addr[i], len[i]);
78
void sha1_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac)
84
for (i = 0; i < num_elem; i++)
85
sha1_process(&md, addr[i], len[i]);
90
void * aes_encrypt_init(const u8 *key, size_t len)
93
skey = os_malloc(sizeof(*skey));
96
if (aes_setup(key, len, 0, skey) != CRYPT_OK) {
104
void aes_encrypt(void *ctx, const u8 *plain, u8 *crypt)
106
symmetric_key *skey = ctx;
107
aes_ecb_encrypt(plain, crypt, skey);
111
void aes_encrypt_deinit(void *ctx)
113
symmetric_key *skey = ctx;
119
void * aes_decrypt_init(const u8 *key, size_t len)
122
skey = os_malloc(sizeof(*skey));
125
if (aes_setup(key, len, 0, skey) != CRYPT_OK) {
133
void aes_decrypt(void *ctx, const u8 *crypt, u8 *plain)
135
symmetric_key *skey = ctx;
136
aes_ecb_encrypt(plain, (u8 *) crypt, skey);
140
void aes_decrypt_deinit(void *ctx)
142
symmetric_key *skey = ctx;
148
#ifdef CONFIG_TLS_INTERNAL
151
enum crypto_hash_alg alg;
160
struct crypto_hash * crypto_hash_init(enum crypto_hash_alg alg, const u8 *key,
163
struct crypto_hash *ctx;
165
ctx = os_zalloc(sizeof(*ctx));
172
case CRYPTO_HASH_ALG_MD5:
173
if (md5_init(&ctx->u.md) != CRYPT_OK)
176
case CRYPTO_HASH_ALG_SHA1:
177
if (sha1_init(&ctx->u.md) != CRYPT_OK)
180
case CRYPTO_HASH_ALG_HMAC_MD5:
181
if (hmac_init(&ctx->u.hmac, find_hash("md5"), key, key_len) !=
185
case CRYPTO_HASH_ALG_HMAC_SHA1:
186
if (hmac_init(&ctx->u.hmac, find_hash("sha1"), key, key_len) !=
201
void crypto_hash_update(struct crypto_hash *ctx, const u8 *data, size_t len)
203
if (ctx == NULL || ctx->error)
207
case CRYPTO_HASH_ALG_MD5:
208
ctx->error = md5_process(&ctx->u.md, data, len) != CRYPT_OK;
210
case CRYPTO_HASH_ALG_SHA1:
211
ctx->error = sha1_process(&ctx->u.md, data, len) != CRYPT_OK;
213
case CRYPTO_HASH_ALG_HMAC_MD5:
214
case CRYPTO_HASH_ALG_HMAC_SHA1:
215
ctx->error = hmac_process(&ctx->u.hmac, data, len) != CRYPT_OK;
221
int crypto_hash_finish(struct crypto_hash *ctx, u8 *mac, size_t *len)
229
if (mac == NULL || len == NULL) {
240
case CRYPTO_HASH_ALG_MD5:
247
if (md5_done(&ctx->u.md, mac) != CRYPT_OK)
250
case CRYPTO_HASH_ALG_SHA1:
257
if (sha1_done(&ctx->u.md, mac) != CRYPT_OK)
260
case CRYPTO_HASH_ALG_HMAC_SHA1:
267
case CRYPTO_HASH_ALG_HMAC_MD5:
274
if (hmac_done(&ctx->u.hmac, mac, &clen) != CRYPT_OK) {
291
struct crypto_cipher {
304
struct crypto_cipher * crypto_cipher_init(enum crypto_cipher_alg alg,
305
const u8 *iv, const u8 *key,
308
struct crypto_cipher *ctx;
309
int idx, res, rc4 = 0;
312
case CRYPTO_CIPHER_ALG_AES:
313
idx = find_cipher("aes");
315
case CRYPTO_CIPHER_ALG_3DES:
316
idx = find_cipher("3des");
318
case CRYPTO_CIPHER_ALG_DES:
319
idx = find_cipher("des");
321
case CRYPTO_CIPHER_ALG_RC2:
322
idx = find_cipher("rc2");
324
case CRYPTO_CIPHER_ALG_RC4:
332
ctx = os_zalloc(sizeof(*ctx));
338
if (key_len > sizeof(ctx->u.rc4.key)) {
342
ctx->u.rc4.keylen = key_len;
343
os_memcpy(ctx->u.rc4.key, key, key_len);
345
res = cbc_start(idx, iv, key, key_len, 0, &ctx->u.cbc);
346
if (res != CRYPT_OK) {
347
wpa_printf(MSG_DEBUG, "LibTomCrypt: Cipher start "
348
"failed: %s", error_to_string(res));
357
int crypto_cipher_encrypt(struct crypto_cipher *ctx, const u8 *plain,
358
u8 *crypt, size_t len)
364
os_memcpy(crypt, plain, len);
365
rc4_skip(ctx->u.rc4.key, ctx->u.rc4.keylen,
366
ctx->u.rc4.used_bytes, crypt, len);
367
ctx->u.rc4.used_bytes += len;
371
res = cbc_encrypt(plain, crypt, len, &ctx->u.cbc);
372
if (res != CRYPT_OK) {
373
wpa_printf(MSG_DEBUG, "LibTomCrypt: CBC encryption "
374
"failed: %s", error_to_string(res));
381
int crypto_cipher_decrypt(struct crypto_cipher *ctx, const u8 *crypt,
382
u8 *plain, size_t len)
388
os_memcpy(plain, crypt, len);
389
rc4_skip(ctx->u.rc4.key, ctx->u.rc4.keylen,
390
ctx->u.rc4.used_bytes, plain, len);
391
ctx->u.rc4.used_bytes += len;
395
res = cbc_decrypt(crypt, plain, len, &ctx->u.cbc);
396
if (res != CRYPT_OK) {
397
wpa_printf(MSG_DEBUG, "LibTomCrypt: CBC decryption "
398
"failed: %s", error_to_string(res));
406
void crypto_cipher_deinit(struct crypto_cipher *ctx)
409
cbc_done(&ctx->u.cbc);
414
struct crypto_public_key {
418
struct crypto_private_key {
423
struct crypto_public_key * crypto_public_key_import(const u8 *key, size_t len)
426
struct crypto_public_key *pk;
428
pk = os_zalloc(sizeof(*pk));
432
res = rsa_import(key, len, &pk->rsa);
433
if (res != CRYPT_OK) {
434
wpa_printf(MSG_ERROR, "LibTomCrypt: Failed to import "
435
"public key (res=%d '%s')",
436
res, error_to_string(res));
441
if (pk->rsa.type != PK_PUBLIC) {
442
wpa_printf(MSG_ERROR, "LibTomCrypt: Public key was not of "
453
struct crypto_private_key * crypto_private_key_import(const u8 *key,
457
struct crypto_private_key *pk;
459
pk = os_zalloc(sizeof(*pk));
463
res = rsa_import(key, len, &pk->rsa);
464
if (res != CRYPT_OK) {
465
wpa_printf(MSG_ERROR, "LibTomCrypt: Failed to import "
466
"private key (res=%d '%s')",
467
res, error_to_string(res));
472
if (pk->rsa.type != PK_PRIVATE) {
473
wpa_printf(MSG_ERROR, "LibTomCrypt: Private key was not of "
484
struct crypto_public_key * crypto_public_key_from_cert(const u8 *buf,
487
/* No X.509 support in LibTomCrypt */
492
static int pkcs1_generate_encryption_block(u8 block_type, size_t modlen,
493
const u8 *in, size_t inlen,
494
u8 *out, size_t *outlen)
502
* EB = 00 || BT || PS || 00 || D
503
* BT = 00 or 01 for private-key operation; 02 for public-key operation
504
* PS = k-3-||D||; at least eight octets
505
* (BT=0: PS=0x00, BT=1: PS=0xff, BT=2: PS=pseudorandom non-zero)
506
* k = length of modulus in octets (modlen)
509
if (modlen < 12 || modlen > *outlen || inlen > modlen - 11) {
510
wpa_printf(MSG_DEBUG, "PKCS #1: %s - Invalid buffer "
511
"lengths (modlen=%lu outlen=%lu inlen=%lu)",
512
__func__, (unsigned long) modlen,
513
(unsigned long) *outlen,
514
(unsigned long) inlen);
520
*pos++ = block_type; /* BT */
521
ps_len = modlen - inlen - 3;
522
switch (block_type) {
524
os_memset(pos, 0x00, ps_len);
528
os_memset(pos, 0xff, ps_len);
532
if (os_get_random(pos, ps_len) < 0) {
533
wpa_printf(MSG_DEBUG, "PKCS #1: %s - Failed to get "
534
"random data for PS", __func__);
544
wpa_printf(MSG_DEBUG, "PKCS #1: %s - Unsupported block type "
545
"%d", __func__, block_type);
549
os_memcpy(pos, in, inlen); /* D */
555
static int crypto_rsa_encrypt_pkcs1(int block_type, rsa_key *key, int key_type,
556
const u8 *in, size_t inlen,
557
u8 *out, size_t *outlen)
559
unsigned long len, modlen;
562
modlen = mp_unsigned_bin_size(key->N);
564
if (pkcs1_generate_encryption_block(block_type, modlen, in, inlen,
569
res = rsa_exptmod(out, modlen, out, &len, key_type, key);
570
if (res != CRYPT_OK) {
571
wpa_printf(MSG_DEBUG, "LibTomCrypt: rsa_exptmod failed: %s",
572
error_to_string(res));
581
int crypto_public_key_encrypt_pkcs1_v15(struct crypto_public_key *key,
582
const u8 *in, size_t inlen,
583
u8 *out, size_t *outlen)
585
return crypto_rsa_encrypt_pkcs1(2, &key->rsa, PK_PUBLIC, in, inlen,
590
int crypto_private_key_sign_pkcs1(struct crypto_private_key *key,
591
const u8 *in, size_t inlen,
592
u8 *out, size_t *outlen)
594
return crypto_rsa_encrypt_pkcs1(1, &key->rsa, PK_PRIVATE, in, inlen,
599
void crypto_public_key_free(struct crypto_public_key *key)
608
void crypto_private_key_free(struct crypto_private_key *key)
617
int crypto_public_key_decrypt_pkcs1(struct crypto_public_key *key,
618
const u8 *crypt, size_t crypt_len,
619
u8 *plain, size_t *plain_len)
626
res = rsa_exptmod(crypt, crypt_len, plain, &len, PK_PUBLIC,
628
if (res != CRYPT_OK) {
629
wpa_printf(MSG_DEBUG, "LibTomCrypt: rsa_exptmod failed: %s",
630
error_to_string(res));
637
* EB = 00 || BT || PS || 00 || D
639
* PS = k-3-||D|| times FF
640
* k = length of modulus in octets
643
if (len < 3 + 8 + 16 /* min hash len */ ||
644
plain[0] != 0x00 || plain[1] != 0x01 || plain[2] != 0xff) {
645
wpa_printf(MSG_INFO, "LibTomCrypt: Invalid signature EB "
651
while (pos < plain + len && *pos == 0xff)
653
if (pos - plain - 2 < 8) {
654
/* PKCS #1 v1.5, 8.1: At least eight octets long PS */
655
wpa_printf(MSG_INFO, "LibTomCrypt: Too short signature "
660
if (pos + 16 /* min hash len */ >= plain + len || *pos != 0x00) {
661
wpa_printf(MSG_INFO, "LibTomCrypt: Invalid signature EB "
668
/* Strip PKCS #1 header */
669
os_memmove(plain, pos, len);
676
int crypto_global_init(void)
679
/* TODO: only register algorithms that are really needed */
680
if (register_hash(&md4_desc) < 0 ||
681
register_hash(&md5_desc) < 0 ||
682
register_hash(&sha1_desc) < 0 ||
683
register_cipher(&aes_desc) < 0 ||
684
register_cipher(&des_desc) < 0 ||
685
register_cipher(&des3_desc) < 0) {
686
wpa_printf(MSG_ERROR, "TLSv1: Failed to register "
687
"hash/cipher functions");
695
void crypto_global_deinit(void)
702
int crypto_mod_exp(const u8 *base, size_t base_len,
703
const u8 *power, size_t power_len,
704
const u8 *modulus, size_t modulus_len,
705
u8 *result, size_t *result_len)
709
if (mp_init_multi(&b, &p, &m, &r, NULL) != CRYPT_OK)
712
if (mp_read_unsigned_bin(b, (u8 *) base, base_len) != CRYPT_OK ||
713
mp_read_unsigned_bin(p, (u8 *) power, power_len) != CRYPT_OK ||
714
mp_read_unsigned_bin(m, (u8 *) modulus, modulus_len) != CRYPT_OK)
717
if (mp_exptmod(b, p, m, r) != CRYPT_OK)
720
*result_len = mp_unsigned_bin_size(r);
721
if (mp_to_unsigned_bin(r, result) != CRYPT_OK)
724
mp_clear_multi(b, p, m, r, NULL);
728
mp_clear_multi(b, p, m, r, NULL);
732
#endif /* EAP_FAST */
734
#endif /* CONFIG_TLS_INTERNAL */
736
#endif /* EAP_TLS_FUNCS */