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 */