737 lines
14 KiB
C
737 lines
14 KiB
C
/*
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* WPA Supplicant / Crypto wrapper for LibTomCrypt (for internal TLSv1)
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* Copyright (c) 2005-2006, Jouni Malinen <j@w1.fi>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Alternatively, this software may be distributed under the terms of BSD
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* license.
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*
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* See README and COPYING for more details.
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*/
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#include "includes.h"
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#include <tomcrypt.h>
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#include "common.h"
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#include "rc4.h"
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#include "crypto.h"
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#ifndef mp_init_multi
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#define mp_init_multi ltc_init_multi
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#define mp_clear_multi ltc_deinit_multi
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#define mp_unsigned_bin_size(a) ltc_mp.unsigned_size(a)
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#define mp_to_unsigned_bin(a, b) ltc_mp.unsigned_write(a, b)
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#define mp_read_unsigned_bin(a, b, c) ltc_mp.unsigned_read(a, b, c)
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#define mp_exptmod(a,b,c,d) ltc_mp.exptmod(a,b,c,d)
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#endif
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void md4_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac)
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{
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hash_state md;
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size_t i;
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md4_init(&md);
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for (i = 0; i < num_elem; i++)
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md4_process(&md, addr[i], len[i]);
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md4_done(&md, mac);
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}
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void des_encrypt(const u8 *clear, const u8 *key, u8 *cypher)
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{
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u8 pkey[8], next, tmp;
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int i;
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symmetric_key skey;
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/* Add parity bits to the key */
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next = 0;
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for (i = 0; i < 7; i++) {
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tmp = key[i];
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pkey[i] = (tmp >> i) | next | 1;
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next = tmp << (7 - i);
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}
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pkey[i] = next | 1;
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des_setup(pkey, 8, 0, &skey);
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des_ecb_encrypt(clear, cypher, &skey);
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des_done(&skey);
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}
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#ifdef EAP_TLS_FUNCS
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void md5_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac)
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{
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hash_state md;
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size_t i;
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md5_init(&md);
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for (i = 0; i < num_elem; i++)
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md5_process(&md, addr[i], len[i]);
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md5_done(&md, mac);
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}
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void sha1_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac)
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{
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hash_state md;
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size_t i;
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sha1_init(&md);
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for (i = 0; i < num_elem; i++)
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sha1_process(&md, addr[i], len[i]);
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sha1_done(&md, mac);
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}
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void * aes_encrypt_init(const u8 *key, size_t len)
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{
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symmetric_key *skey;
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skey = os_malloc(sizeof(*skey));
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if (skey == NULL)
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return NULL;
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if (aes_setup(key, len, 0, skey) != CRYPT_OK) {
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os_free(skey);
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return NULL;
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}
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return skey;
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}
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void aes_encrypt(void *ctx, const u8 *plain, u8 *crypt)
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{
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symmetric_key *skey = ctx;
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aes_ecb_encrypt(plain, crypt, skey);
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}
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void aes_encrypt_deinit(void *ctx)
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{
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symmetric_key *skey = ctx;
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aes_done(skey);
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os_free(skey);
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}
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void * aes_decrypt_init(const u8 *key, size_t len)
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{
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symmetric_key *skey;
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skey = os_malloc(sizeof(*skey));
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if (skey == NULL)
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return NULL;
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if (aes_setup(key, len, 0, skey) != CRYPT_OK) {
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os_free(skey);
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return NULL;
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}
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return skey;
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}
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void aes_decrypt(void *ctx, const u8 *crypt, u8 *plain)
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{
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symmetric_key *skey = ctx;
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aes_ecb_encrypt(plain, (u8 *) crypt, skey);
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}
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void aes_decrypt_deinit(void *ctx)
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{
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symmetric_key *skey = ctx;
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aes_done(skey);
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os_free(skey);
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}
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#ifdef CONFIG_TLS_INTERNAL
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struct crypto_hash {
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enum crypto_hash_alg alg;
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int error;
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union {
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hash_state md;
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hmac_state hmac;
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} u;
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};
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struct crypto_hash * crypto_hash_init(enum crypto_hash_alg alg, const u8 *key,
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size_t key_len)
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{
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struct crypto_hash *ctx;
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ctx = os_zalloc(sizeof(*ctx));
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if (ctx == NULL)
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return NULL;
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ctx->alg = alg;
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switch (alg) {
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case CRYPTO_HASH_ALG_MD5:
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if (md5_init(&ctx->u.md) != CRYPT_OK)
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goto fail;
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break;
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case CRYPTO_HASH_ALG_SHA1:
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if (sha1_init(&ctx->u.md) != CRYPT_OK)
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goto fail;
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break;
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case CRYPTO_HASH_ALG_HMAC_MD5:
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if (hmac_init(&ctx->u.hmac, find_hash("md5"), key, key_len) !=
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CRYPT_OK)
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goto fail;
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break;
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case CRYPTO_HASH_ALG_HMAC_SHA1:
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if (hmac_init(&ctx->u.hmac, find_hash("sha1"), key, key_len) !=
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CRYPT_OK)
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goto fail;
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break;
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default:
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goto fail;
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}
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return ctx;
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fail:
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os_free(ctx);
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return NULL;
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}
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void crypto_hash_update(struct crypto_hash *ctx, const u8 *data, size_t len)
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{
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if (ctx == NULL || ctx->error)
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return;
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switch (ctx->alg) {
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case CRYPTO_HASH_ALG_MD5:
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ctx->error = md5_process(&ctx->u.md, data, len) != CRYPT_OK;
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break;
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case CRYPTO_HASH_ALG_SHA1:
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ctx->error = sha1_process(&ctx->u.md, data, len) != CRYPT_OK;
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break;
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case CRYPTO_HASH_ALG_HMAC_MD5:
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case CRYPTO_HASH_ALG_HMAC_SHA1:
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ctx->error = hmac_process(&ctx->u.hmac, data, len) != CRYPT_OK;
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break;
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}
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}
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int crypto_hash_finish(struct crypto_hash *ctx, u8 *mac, size_t *len)
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{
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int ret = 0;
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unsigned long clen;
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if (ctx == NULL)
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return -2;
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if (mac == NULL || len == NULL) {
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os_free(ctx);
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return 0;
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}
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if (ctx->error) {
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os_free(ctx);
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return -2;
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}
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switch (ctx->alg) {
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case CRYPTO_HASH_ALG_MD5:
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if (*len < 16) {
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*len = 16;
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os_free(ctx);
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return -1;
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}
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*len = 16;
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if (md5_done(&ctx->u.md, mac) != CRYPT_OK)
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ret = -2;
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break;
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case CRYPTO_HASH_ALG_SHA1:
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if (*len < 20) {
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*len = 20;
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os_free(ctx);
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return -1;
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}
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*len = 20;
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if (sha1_done(&ctx->u.md, mac) != CRYPT_OK)
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ret = -2;
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break;
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case CRYPTO_HASH_ALG_HMAC_SHA1:
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if (*len < 20) {
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*len = 20;
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os_free(ctx);
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return -1;
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}
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/* continue */
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case CRYPTO_HASH_ALG_HMAC_MD5:
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if (*len < 16) {
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*len = 16;
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os_free(ctx);
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return -1;
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}
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clen = *len;
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if (hmac_done(&ctx->u.hmac, mac, &clen) != CRYPT_OK) {
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os_free(ctx);
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return -1;
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}
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*len = clen;
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break;
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default:
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ret = -2;
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break;
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}
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os_free(ctx);
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return ret;
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}
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struct crypto_cipher {
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int rc4;
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union {
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symmetric_CBC cbc;
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struct {
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size_t used_bytes;
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u8 key[16];
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size_t keylen;
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} rc4;
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} u;
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};
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struct crypto_cipher * crypto_cipher_init(enum crypto_cipher_alg alg,
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const u8 *iv, const u8 *key,
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size_t key_len)
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{
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struct crypto_cipher *ctx;
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int idx, res, rc4 = 0;
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switch (alg) {
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case CRYPTO_CIPHER_ALG_AES:
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idx = find_cipher("aes");
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break;
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case CRYPTO_CIPHER_ALG_3DES:
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idx = find_cipher("3des");
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break;
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case CRYPTO_CIPHER_ALG_DES:
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idx = find_cipher("des");
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break;
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case CRYPTO_CIPHER_ALG_RC2:
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idx = find_cipher("rc2");
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break;
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case CRYPTO_CIPHER_ALG_RC4:
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idx = -1;
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rc4 = 1;
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break;
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default:
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return NULL;
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}
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ctx = os_zalloc(sizeof(*ctx));
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if (ctx == NULL)
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return NULL;
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if (rc4) {
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ctx->rc4 = 1;
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if (key_len > sizeof(ctx->u.rc4.key)) {
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os_free(ctx);
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return NULL;
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}
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ctx->u.rc4.keylen = key_len;
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os_memcpy(ctx->u.rc4.key, key, key_len);
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} else {
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res = cbc_start(idx, iv, key, key_len, 0, &ctx->u.cbc);
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if (res != CRYPT_OK) {
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wpa_printf(MSG_DEBUG, "LibTomCrypt: Cipher start "
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"failed: %s", error_to_string(res));
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os_free(ctx);
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return NULL;
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}
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}
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return ctx;
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}
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int crypto_cipher_encrypt(struct crypto_cipher *ctx, const u8 *plain,
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u8 *crypt, size_t len)
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{
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int res;
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if (ctx->rc4) {
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if (plain != crypt)
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os_memcpy(crypt, plain, len);
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rc4_skip(ctx->u.rc4.key, ctx->u.rc4.keylen,
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ctx->u.rc4.used_bytes, crypt, len);
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ctx->u.rc4.used_bytes += len;
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return 0;
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}
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res = cbc_encrypt(plain, crypt, len, &ctx->u.cbc);
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if (res != CRYPT_OK) {
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wpa_printf(MSG_DEBUG, "LibTomCrypt: CBC encryption "
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"failed: %s", error_to_string(res));
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return -1;
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}
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return 0;
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}
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int crypto_cipher_decrypt(struct crypto_cipher *ctx, const u8 *crypt,
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u8 *plain, size_t len)
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{
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int res;
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if (ctx->rc4) {
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if (plain != crypt)
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os_memcpy(plain, crypt, len);
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rc4_skip(ctx->u.rc4.key, ctx->u.rc4.keylen,
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ctx->u.rc4.used_bytes, plain, len);
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ctx->u.rc4.used_bytes += len;
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return 0;
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}
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res = cbc_decrypt(crypt, plain, len, &ctx->u.cbc);
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if (res != CRYPT_OK) {
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wpa_printf(MSG_DEBUG, "LibTomCrypt: CBC decryption "
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"failed: %s", error_to_string(res));
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return -1;
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}
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return 0;
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}
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void crypto_cipher_deinit(struct crypto_cipher *ctx)
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{
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if (!ctx->rc4)
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cbc_done(&ctx->u.cbc);
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os_free(ctx);
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}
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struct crypto_public_key {
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rsa_key rsa;
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};
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struct crypto_private_key {
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rsa_key rsa;
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};
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struct crypto_public_key * crypto_public_key_import(const u8 *key, size_t len)
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{
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int res;
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struct crypto_public_key *pk;
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pk = os_zalloc(sizeof(*pk));
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if (pk == NULL)
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return NULL;
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res = rsa_import(key, len, &pk->rsa);
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if (res != CRYPT_OK) {
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wpa_printf(MSG_ERROR, "LibTomCrypt: Failed to import "
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"public key (res=%d '%s')",
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res, error_to_string(res));
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os_free(pk);
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return NULL;
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}
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if (pk->rsa.type != PK_PUBLIC) {
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wpa_printf(MSG_ERROR, "LibTomCrypt: Public key was not of "
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"correct type");
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rsa_free(&pk->rsa);
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os_free(pk);
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return NULL;
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}
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return pk;
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}
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struct crypto_private_key * crypto_private_key_import(const u8 *key,
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size_t len)
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{
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int res;
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struct crypto_private_key *pk;
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pk = os_zalloc(sizeof(*pk));
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if (pk == NULL)
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return NULL;
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res = rsa_import(key, len, &pk->rsa);
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if (res != CRYPT_OK) {
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wpa_printf(MSG_ERROR, "LibTomCrypt: Failed to import "
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"private key (res=%d '%s')",
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res, error_to_string(res));
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os_free(pk);
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return NULL;
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}
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if (pk->rsa.type != PK_PRIVATE) {
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wpa_printf(MSG_ERROR, "LibTomCrypt: Private key was not of "
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"correct type");
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rsa_free(&pk->rsa);
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os_free(pk);
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return NULL;
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}
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return pk;
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}
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struct crypto_public_key * crypto_public_key_from_cert(const u8 *buf,
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size_t len)
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{
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/* No X.509 support in LibTomCrypt */
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return NULL;
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}
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static int pkcs1_generate_encryption_block(u8 block_type, size_t modlen,
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const u8 *in, size_t inlen,
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u8 *out, size_t *outlen)
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{
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size_t ps_len;
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u8 *pos;
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/*
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* PKCS #1 v1.5, 8.1:
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*
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* EB = 00 || BT || PS || 00 || D
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* BT = 00 or 01 for private-key operation; 02 for public-key operation
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* PS = k-3-||D||; at least eight octets
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* (BT=0: PS=0x00, BT=1: PS=0xff, BT=2: PS=pseudorandom non-zero)
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* k = length of modulus in octets (modlen)
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*/
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if (modlen < 12 || modlen > *outlen || inlen > modlen - 11) {
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wpa_printf(MSG_DEBUG, "PKCS #1: %s - Invalid buffer "
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"lengths (modlen=%lu outlen=%lu inlen=%lu)",
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__func__, (unsigned long) modlen,
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(unsigned long) *outlen,
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(unsigned long) inlen);
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return -1;
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}
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pos = out;
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*pos++ = 0x00;
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*pos++ = block_type; /* BT */
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ps_len = modlen - inlen - 3;
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switch (block_type) {
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case 0:
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os_memset(pos, 0x00, ps_len);
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pos += ps_len;
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break;
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case 1:
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os_memset(pos, 0xff, ps_len);
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pos += ps_len;
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break;
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case 2:
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if (os_get_random(pos, ps_len) < 0) {
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wpa_printf(MSG_DEBUG, "PKCS #1: %s - Failed to get "
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"random data for PS", __func__);
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return -1;
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}
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while (ps_len--) {
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if (*pos == 0x00)
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*pos = 0x01;
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pos++;
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}
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break;
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default:
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wpa_printf(MSG_DEBUG, "PKCS #1: %s - Unsupported block type "
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"%d", __func__, block_type);
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return -1;
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}
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*pos++ = 0x00;
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os_memcpy(pos, in, inlen); /* D */
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return 0;
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}
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static int crypto_rsa_encrypt_pkcs1(int block_type, rsa_key *key, int key_type,
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const u8 *in, size_t inlen,
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u8 *out, size_t *outlen)
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{
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unsigned long len, modlen;
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int res;
|
|
|
|
modlen = mp_unsigned_bin_size(key->N);
|
|
|
|
if (pkcs1_generate_encryption_block(block_type, modlen, in, inlen,
|
|
out, outlen) < 0)
|
|
return -1;
|
|
|
|
len = *outlen;
|
|
res = rsa_exptmod(out, modlen, out, &len, key_type, key);
|
|
if (res != CRYPT_OK) {
|
|
wpa_printf(MSG_DEBUG, "LibTomCrypt: rsa_exptmod failed: %s",
|
|
error_to_string(res));
|
|
return -1;
|
|
}
|
|
*outlen = len;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
int crypto_public_key_encrypt_pkcs1_v15(struct crypto_public_key *key,
|
|
const u8 *in, size_t inlen,
|
|
u8 *out, size_t *outlen)
|
|
{
|
|
return crypto_rsa_encrypt_pkcs1(2, &key->rsa, PK_PUBLIC, in, inlen,
|
|
out, outlen);
|
|
}
|
|
|
|
|
|
int crypto_private_key_sign_pkcs1(struct crypto_private_key *key,
|
|
const u8 *in, size_t inlen,
|
|
u8 *out, size_t *outlen)
|
|
{
|
|
return crypto_rsa_encrypt_pkcs1(1, &key->rsa, PK_PRIVATE, in, inlen,
|
|
out, outlen);
|
|
}
|
|
|
|
|
|
void crypto_public_key_free(struct crypto_public_key *key)
|
|
{
|
|
if (key) {
|
|
rsa_free(&key->rsa);
|
|
os_free(key);
|
|
}
|
|
}
|
|
|
|
|
|
void crypto_private_key_free(struct crypto_private_key *key)
|
|
{
|
|
if (key) {
|
|
rsa_free(&key->rsa);
|
|
os_free(key);
|
|
}
|
|
}
|
|
|
|
|
|
int crypto_public_key_decrypt_pkcs1(struct crypto_public_key *key,
|
|
const u8 *crypt, size_t crypt_len,
|
|
u8 *plain, size_t *plain_len)
|
|
{
|
|
int res;
|
|
unsigned long len;
|
|
u8 *pos;
|
|
|
|
len = *plain_len;
|
|
res = rsa_exptmod(crypt, crypt_len, plain, &len, PK_PUBLIC,
|
|
&key->rsa);
|
|
if (res != CRYPT_OK) {
|
|
wpa_printf(MSG_DEBUG, "LibTomCrypt: rsa_exptmod failed: %s",
|
|
error_to_string(res));
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* PKCS #1 v1.5, 8.1:
|
|
*
|
|
* EB = 00 || BT || PS || 00 || D
|
|
* BT = 01
|
|
* PS = k-3-||D|| times FF
|
|
* k = length of modulus in octets
|
|
*/
|
|
|
|
if (len < 3 + 8 + 16 /* min hash len */ ||
|
|
plain[0] != 0x00 || plain[1] != 0x01 || plain[2] != 0xff) {
|
|
wpa_printf(MSG_INFO, "LibTomCrypt: Invalid signature EB "
|
|
"structure");
|
|
return -1;
|
|
}
|
|
|
|
pos = plain + 3;
|
|
while (pos < plain + len && *pos == 0xff)
|
|
pos++;
|
|
if (pos - plain - 2 < 8) {
|
|
/* PKCS #1 v1.5, 8.1: At least eight octets long PS */
|
|
wpa_printf(MSG_INFO, "LibTomCrypt: Too short signature "
|
|
"padding");
|
|
return -1;
|
|
}
|
|
|
|
if (pos + 16 /* min hash len */ >= plain + len || *pos != 0x00) {
|
|
wpa_printf(MSG_INFO, "LibTomCrypt: Invalid signature EB "
|
|
"structure (2)");
|
|
return -1;
|
|
}
|
|
pos++;
|
|
len -= pos - plain;
|
|
|
|
/* Strip PKCS #1 header */
|
|
os_memmove(plain, pos, len);
|
|
*plain_len = len;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
int crypto_global_init(void)
|
|
{
|
|
ltc_mp = tfm_desc;
|
|
/* TODO: only register algorithms that are really needed */
|
|
if (register_hash(&md4_desc) < 0 ||
|
|
register_hash(&md5_desc) < 0 ||
|
|
register_hash(&sha1_desc) < 0 ||
|
|
register_cipher(&aes_desc) < 0 ||
|
|
register_cipher(&des_desc) < 0 ||
|
|
register_cipher(&des3_desc) < 0) {
|
|
wpa_printf(MSG_ERROR, "TLSv1: Failed to register "
|
|
"hash/cipher functions");
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
void crypto_global_deinit(void)
|
|
{
|
|
}
|
|
|
|
|
|
#ifdef EAP_FAST
|
|
|
|
int crypto_mod_exp(const u8 *base, size_t base_len,
|
|
const u8 *power, size_t power_len,
|
|
const u8 *modulus, size_t modulus_len,
|
|
u8 *result, size_t *result_len)
|
|
{
|
|
void *b, *p, *m, *r;
|
|
|
|
if (mp_init_multi(&b, &p, &m, &r, NULL) != CRYPT_OK)
|
|
return -1;
|
|
|
|
if (mp_read_unsigned_bin(b, (u8 *) base, base_len) != CRYPT_OK ||
|
|
mp_read_unsigned_bin(p, (u8 *) power, power_len) != CRYPT_OK ||
|
|
mp_read_unsigned_bin(m, (u8 *) modulus, modulus_len) != CRYPT_OK)
|
|
goto fail;
|
|
|
|
if (mp_exptmod(b, p, m, r) != CRYPT_OK)
|
|
goto fail;
|
|
|
|
*result_len = mp_unsigned_bin_size(r);
|
|
if (mp_to_unsigned_bin(r, result) != CRYPT_OK)
|
|
goto fail;
|
|
|
|
mp_clear_multi(b, p, m, r, NULL);
|
|
return 0;
|
|
|
|
fail:
|
|
mp_clear_multi(b, p, m, r, NULL);
|
|
return -1;
|
|
}
|
|
|
|
#endif /* EAP_FAST */
|
|
|
|
#endif /* CONFIG_TLS_INTERNAL */
|
|
|
|
#endif /* EAP_TLS_FUNCS */
|