2 * WPA Supplicant / Crypto wrapper for LibTomCrypt (for internal TLSv1)
3 * Copyright (c) 2005-2006, Jouni Malinen <j@w1.fi>
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
16 #define mp_init_multi ltc_init_multi
17 #define mp_clear_multi ltc_deinit_multi
18 #define mp_unsigned_bin_size(a) ltc_mp.unsigned_size(a)
19 #define mp_to_unsigned_bin(a, b) ltc_mp.unsigned_write(a, b)
20 #define mp_read_unsigned_bin(a, b, c) ltc_mp.unsigned_read(a, b, c)
21 #define mp_exptmod(a,b,c,d) ltc_mp.exptmod(a,b,c,d)
25 int md4_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac)
31 for (i = 0; i < num_elem; i++)
32 md4_process(&md, addr[i], len[i]);
38 void des_encrypt(const u8 *clear, const u8 *key, u8 *cypher)
40 u8 pkey[8], next, tmp;
44 /* Add parity bits to the key */
46 for (i = 0; i < 7; i++) {
48 pkey[i] = (tmp >> i) | next | 1;
49 next = tmp << (7 - i);
53 des_setup(pkey, 8, 0, &skey);
54 des_ecb_encrypt(clear, cypher, &skey);
59 int md5_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac)
65 for (i = 0; i < num_elem; i++)
66 md5_process(&md, addr[i], len[i]);
72 int sha1_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac)
78 for (i = 0; i < num_elem; i++)
79 sha1_process(&md, addr[i], len[i]);
85 void * aes_encrypt_init(const u8 *key, size_t len)
88 skey = os_malloc(sizeof(*skey));
91 if (aes_setup(key, len, 0, skey) != CRYPT_OK) {
99 void aes_encrypt(void *ctx, const u8 *plain, u8 *crypt)
101 symmetric_key *skey = ctx;
102 aes_ecb_encrypt(plain, crypt, skey);
106 void aes_encrypt_deinit(void *ctx)
108 symmetric_key *skey = ctx;
114 void * aes_decrypt_init(const u8 *key, size_t len)
117 skey = os_malloc(sizeof(*skey));
120 if (aes_setup(key, len, 0, skey) != CRYPT_OK) {
128 void aes_decrypt(void *ctx, const u8 *crypt, u8 *plain)
130 symmetric_key *skey = ctx;
131 aes_ecb_encrypt(plain, (u8 *) crypt, skey);
135 void aes_decrypt_deinit(void *ctx)
137 symmetric_key *skey = ctx;
144 enum crypto_hash_alg alg;
153 struct crypto_hash * crypto_hash_init(enum crypto_hash_alg alg, const u8 *key,
156 struct crypto_hash *ctx;
158 ctx = os_zalloc(sizeof(*ctx));
165 case CRYPTO_HASH_ALG_MD5:
166 if (md5_init(&ctx->u.md) != CRYPT_OK)
169 case CRYPTO_HASH_ALG_SHA1:
170 if (sha1_init(&ctx->u.md) != CRYPT_OK)
173 case CRYPTO_HASH_ALG_HMAC_MD5:
174 if (hmac_init(&ctx->u.hmac, find_hash("md5"), key, key_len) !=
178 case CRYPTO_HASH_ALG_HMAC_SHA1:
179 if (hmac_init(&ctx->u.hmac, find_hash("sha1"), key, key_len) !=
194 void crypto_hash_update(struct crypto_hash *ctx, const u8 *data, size_t len)
196 if (ctx == NULL || ctx->error)
200 case CRYPTO_HASH_ALG_MD5:
201 ctx->error = md5_process(&ctx->u.md, data, len) != CRYPT_OK;
203 case CRYPTO_HASH_ALG_SHA1:
204 ctx->error = sha1_process(&ctx->u.md, data, len) != CRYPT_OK;
206 case CRYPTO_HASH_ALG_HMAC_MD5:
207 case CRYPTO_HASH_ALG_HMAC_SHA1:
208 ctx->error = hmac_process(&ctx->u.hmac, data, len) != CRYPT_OK;
214 int crypto_hash_finish(struct crypto_hash *ctx, u8 *mac, size_t *len)
222 if (mac == NULL || len == NULL) {
233 case CRYPTO_HASH_ALG_MD5:
240 if (md5_done(&ctx->u.md, mac) != CRYPT_OK)
243 case CRYPTO_HASH_ALG_SHA1:
250 if (sha1_done(&ctx->u.md, mac) != CRYPT_OK)
253 case CRYPTO_HASH_ALG_HMAC_SHA1:
260 case CRYPTO_HASH_ALG_HMAC_MD5:
267 if (hmac_done(&ctx->u.hmac, mac, &clen) != CRYPT_OK) {
284 struct crypto_cipher {
297 struct crypto_cipher * crypto_cipher_init(enum crypto_cipher_alg alg,
298 const u8 *iv, const u8 *key,
301 struct crypto_cipher *ctx;
302 int idx, res, rc4 = 0;
305 case CRYPTO_CIPHER_ALG_AES:
306 idx = find_cipher("aes");
308 case CRYPTO_CIPHER_ALG_3DES:
309 idx = find_cipher("3des");
311 case CRYPTO_CIPHER_ALG_DES:
312 idx = find_cipher("des");
314 case CRYPTO_CIPHER_ALG_RC2:
315 idx = find_cipher("rc2");
317 case CRYPTO_CIPHER_ALG_RC4:
325 ctx = os_zalloc(sizeof(*ctx));
331 if (key_len > sizeof(ctx->u.rc4.key)) {
335 ctx->u.rc4.keylen = key_len;
336 os_memcpy(ctx->u.rc4.key, key, key_len);
338 res = cbc_start(idx, iv, key, key_len, 0, &ctx->u.cbc);
339 if (res != CRYPT_OK) {
340 wpa_printf(MSG_DEBUG, "LibTomCrypt: Cipher start "
341 "failed: %s", error_to_string(res));
350 int crypto_cipher_encrypt(struct crypto_cipher *ctx, const u8 *plain,
351 u8 *crypt, size_t len)
357 os_memcpy(crypt, plain, len);
358 rc4_skip(ctx->u.rc4.key, ctx->u.rc4.keylen,
359 ctx->u.rc4.used_bytes, crypt, len);
360 ctx->u.rc4.used_bytes += len;
364 res = cbc_encrypt(plain, crypt, len, &ctx->u.cbc);
365 if (res != CRYPT_OK) {
366 wpa_printf(MSG_DEBUG, "LibTomCrypt: CBC encryption "
367 "failed: %s", error_to_string(res));
374 int crypto_cipher_decrypt(struct crypto_cipher *ctx, const u8 *crypt,
375 u8 *plain, size_t len)
381 os_memcpy(plain, crypt, len);
382 rc4_skip(ctx->u.rc4.key, ctx->u.rc4.keylen,
383 ctx->u.rc4.used_bytes, plain, len);
384 ctx->u.rc4.used_bytes += len;
388 res = cbc_decrypt(crypt, plain, len, &ctx->u.cbc);
389 if (res != CRYPT_OK) {
390 wpa_printf(MSG_DEBUG, "LibTomCrypt: CBC decryption "
391 "failed: %s", error_to_string(res));
399 void crypto_cipher_deinit(struct crypto_cipher *ctx)
402 cbc_done(&ctx->u.cbc);
407 struct crypto_public_key {
411 struct crypto_private_key {
416 struct crypto_public_key * crypto_public_key_import(const u8 *key, size_t len)
419 struct crypto_public_key *pk;
421 pk = os_zalloc(sizeof(*pk));
425 res = rsa_import(key, len, &pk->rsa);
426 if (res != CRYPT_OK) {
427 wpa_printf(MSG_ERROR, "LibTomCrypt: Failed to import "
428 "public key (res=%d '%s')",
429 res, error_to_string(res));
434 if (pk->rsa.type != PK_PUBLIC) {
435 wpa_printf(MSG_ERROR, "LibTomCrypt: Public key was not of "
446 struct crypto_private_key * crypto_private_key_import(const u8 *key,
451 struct crypto_private_key *pk;
453 pk = os_zalloc(sizeof(*pk));
457 res = rsa_import(key, len, &pk->rsa);
458 if (res != CRYPT_OK) {
459 wpa_printf(MSG_ERROR, "LibTomCrypt: Failed to import "
460 "private key (res=%d '%s')",
461 res, error_to_string(res));
466 if (pk->rsa.type != PK_PRIVATE) {
467 wpa_printf(MSG_ERROR, "LibTomCrypt: Private key was not of "
478 struct crypto_public_key * crypto_public_key_from_cert(const u8 *buf,
481 /* No X.509 support in LibTomCrypt */
486 static int pkcs1_generate_encryption_block(u8 block_type, size_t modlen,
487 const u8 *in, size_t inlen,
488 u8 *out, size_t *outlen)
496 * EB = 00 || BT || PS || 00 || D
497 * BT = 00 or 01 for private-key operation; 02 for public-key operation
498 * PS = k-3-||D||; at least eight octets
499 * (BT=0: PS=0x00, BT=1: PS=0xff, BT=2: PS=pseudorandom non-zero)
500 * k = length of modulus in octets (modlen)
503 if (modlen < 12 || modlen > *outlen || inlen > modlen - 11) {
504 wpa_printf(MSG_DEBUG, "PKCS #1: %s - Invalid buffer "
505 "lengths (modlen=%lu outlen=%lu inlen=%lu)",
506 __func__, (unsigned long) modlen,
507 (unsigned long) *outlen,
508 (unsigned long) inlen);
514 *pos++ = block_type; /* BT */
515 ps_len = modlen - inlen - 3;
516 switch (block_type) {
518 os_memset(pos, 0x00, ps_len);
522 os_memset(pos, 0xff, ps_len);
526 if (os_get_random(pos, ps_len) < 0) {
527 wpa_printf(MSG_DEBUG, "PKCS #1: %s - Failed to get "
528 "random data for PS", __func__);
538 wpa_printf(MSG_DEBUG, "PKCS #1: %s - Unsupported block type "
539 "%d", __func__, block_type);
543 os_memcpy(pos, in, inlen); /* D */
549 static int crypto_rsa_encrypt_pkcs1(int block_type, rsa_key *key, int key_type,
550 const u8 *in, size_t inlen,
551 u8 *out, size_t *outlen)
553 unsigned long len, modlen;
556 modlen = mp_unsigned_bin_size(key->N);
558 if (pkcs1_generate_encryption_block(block_type, modlen, in, inlen,
563 res = rsa_exptmod(out, modlen, out, &len, key_type, key);
564 if (res != CRYPT_OK) {
565 wpa_printf(MSG_DEBUG, "LibTomCrypt: rsa_exptmod failed: %s",
566 error_to_string(res));
575 int crypto_public_key_encrypt_pkcs1_v15(struct crypto_public_key *key,
576 const u8 *in, size_t inlen,
577 u8 *out, size_t *outlen)
579 return crypto_rsa_encrypt_pkcs1(2, &key->rsa, PK_PUBLIC, in, inlen,
584 int crypto_private_key_sign_pkcs1(struct crypto_private_key *key,
585 const u8 *in, size_t inlen,
586 u8 *out, size_t *outlen)
588 return crypto_rsa_encrypt_pkcs1(1, &key->rsa, PK_PRIVATE, in, inlen,
593 void crypto_public_key_free(struct crypto_public_key *key)
602 void crypto_private_key_free(struct crypto_private_key *key)
611 int crypto_public_key_decrypt_pkcs1(struct crypto_public_key *key,
612 const u8 *crypt, size_t crypt_len,
613 u8 *plain, size_t *plain_len)
620 res = rsa_exptmod(crypt, crypt_len, plain, &len, PK_PUBLIC,
622 if (res != CRYPT_OK) {
623 wpa_printf(MSG_DEBUG, "LibTomCrypt: rsa_exptmod failed: %s",
624 error_to_string(res));
631 * EB = 00 || BT || PS || 00 || D
633 * PS = k-3-||D|| times FF
634 * k = length of modulus in octets
637 if (len < 3 + 8 + 16 /* min hash len */ ||
638 plain[0] != 0x00 || plain[1] != 0x01 || plain[2] != 0xff) {
639 wpa_printf(MSG_INFO, "LibTomCrypt: Invalid signature EB "
645 while (pos < plain + len && *pos == 0xff)
647 if (pos - plain - 2 < 8) {
648 /* PKCS #1 v1.5, 8.1: At least eight octets long PS */
649 wpa_printf(MSG_INFO, "LibTomCrypt: Too short signature "
654 if (pos + 16 /* min hash len */ >= plain + len || *pos != 0x00) {
655 wpa_printf(MSG_INFO, "LibTomCrypt: Invalid signature EB "
662 /* Strip PKCS #1 header */
663 os_memmove(plain, pos, len);
670 int crypto_global_init(void)
673 /* TODO: only register algorithms that are really needed */
674 if (register_hash(&md4_desc) < 0 ||
675 register_hash(&md5_desc) < 0 ||
676 register_hash(&sha1_desc) < 0 ||
677 register_cipher(&aes_desc) < 0 ||
678 register_cipher(&des_desc) < 0 ||
679 register_cipher(&des3_desc) < 0) {
680 wpa_printf(MSG_ERROR, "TLSv1: Failed to register "
681 "hash/cipher functions");
689 void crypto_global_deinit(void)
696 int crypto_mod_exp(const u8 *base, size_t base_len,
697 const u8 *power, size_t power_len,
698 const u8 *modulus, size_t modulus_len,
699 u8 *result, size_t *result_len)
703 if (mp_init_multi(&b, &p, &m, &r, NULL) != CRYPT_OK)
706 if (mp_read_unsigned_bin(b, (u8 *) base, base_len) != CRYPT_OK ||
707 mp_read_unsigned_bin(p, (u8 *) power, power_len) != CRYPT_OK ||
708 mp_read_unsigned_bin(m, (u8 *) modulus, modulus_len) != CRYPT_OK)
711 if (mp_exptmod(b, p, m, r) != CRYPT_OK)
714 *result_len = mp_unsigned_bin_size(r);
715 if (mp_to_unsigned_bin(r, result) != CRYPT_OK)
718 mp_clear_multi(b, p, m, r, NULL);
722 mp_clear_multi(b, p, m, r, NULL);
726 #endif /* CONFIG_MODEXP */