mirror of
https://github.com/vanhoefm/fragattacks.git
synced 2024-11-27 01:38:37 -05:00
2d106f21aa
The following defines are not really needed in most places, so remove them to clean up source code and build scripts: EAP_TLS_FUNCS EAP_TLS_OPENSSL EAP_TLS_GNUTLS CONFIG_TLS_INTERNAL
584 lines
12 KiB
C
584 lines
12 KiB
C
/*
|
|
* WPA Supplicant / Crypto wrapper for internal crypto implementation
|
|
* Copyright (c) 2006-2009, Jouni Malinen <j@w1.fi>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* Alternatively, this software may be distributed under the terms of BSD
|
|
* license.
|
|
*
|
|
* See README and COPYING for more details.
|
|
*/
|
|
|
|
#include "includes.h"
|
|
|
|
#include "common.h"
|
|
#include "crypto.h"
|
|
#include "md5.h"
|
|
#include "sha1.h"
|
|
#include "aes.h"
|
|
#include "tls/rsa.h"
|
|
#include "tls/bignum.h"
|
|
#include "tls/pkcs1.h"
|
|
#include "tls/pkcs8.h"
|
|
#include "sha1_i.h"
|
|
#include "md5_i.h"
|
|
#include "des_i.h"
|
|
|
|
struct crypto_hash {
|
|
enum crypto_hash_alg alg;
|
|
union {
|
|
struct MD5Context md5;
|
|
struct SHA1Context sha1;
|
|
} u;
|
|
u8 key[64];
|
|
size_t key_len;
|
|
};
|
|
|
|
|
|
struct crypto_hash * crypto_hash_init(enum crypto_hash_alg alg, const u8 *key,
|
|
size_t key_len)
|
|
{
|
|
struct crypto_hash *ctx;
|
|
u8 k_pad[64];
|
|
u8 tk[20];
|
|
size_t i;
|
|
|
|
ctx = os_zalloc(sizeof(*ctx));
|
|
if (ctx == NULL)
|
|
return NULL;
|
|
|
|
ctx->alg = alg;
|
|
|
|
switch (alg) {
|
|
case CRYPTO_HASH_ALG_MD5:
|
|
MD5Init(&ctx->u.md5);
|
|
break;
|
|
case CRYPTO_HASH_ALG_SHA1:
|
|
SHA1Init(&ctx->u.sha1);
|
|
break;
|
|
case CRYPTO_HASH_ALG_HMAC_MD5:
|
|
if (key_len > sizeof(k_pad)) {
|
|
MD5Init(&ctx->u.md5);
|
|
MD5Update(&ctx->u.md5, key, key_len);
|
|
MD5Final(tk, &ctx->u.md5);
|
|
key = tk;
|
|
key_len = 16;
|
|
}
|
|
os_memcpy(ctx->key, key, key_len);
|
|
ctx->key_len = key_len;
|
|
|
|
os_memcpy(k_pad, key, key_len);
|
|
os_memset(k_pad + key_len, 0, sizeof(k_pad) - key_len);
|
|
for (i = 0; i < sizeof(k_pad); i++)
|
|
k_pad[i] ^= 0x36;
|
|
MD5Init(&ctx->u.md5);
|
|
MD5Update(&ctx->u.md5, k_pad, sizeof(k_pad));
|
|
break;
|
|
case CRYPTO_HASH_ALG_HMAC_SHA1:
|
|
if (key_len > sizeof(k_pad)) {
|
|
SHA1Init(&ctx->u.sha1);
|
|
SHA1Update(&ctx->u.sha1, key, key_len);
|
|
SHA1Final(tk, &ctx->u.sha1);
|
|
key = tk;
|
|
key_len = 20;
|
|
}
|
|
os_memcpy(ctx->key, key, key_len);
|
|
ctx->key_len = key_len;
|
|
|
|
os_memcpy(k_pad, key, key_len);
|
|
os_memset(k_pad + key_len, 0, sizeof(k_pad) - key_len);
|
|
for (i = 0; i < sizeof(k_pad); i++)
|
|
k_pad[i] ^= 0x36;
|
|
SHA1Init(&ctx->u.sha1);
|
|
SHA1Update(&ctx->u.sha1, k_pad, sizeof(k_pad));
|
|
break;
|
|
default:
|
|
os_free(ctx);
|
|
return NULL;
|
|
}
|
|
|
|
return ctx;
|
|
}
|
|
|
|
|
|
void crypto_hash_update(struct crypto_hash *ctx, const u8 *data, size_t len)
|
|
{
|
|
if (ctx == NULL)
|
|
return;
|
|
|
|
switch (ctx->alg) {
|
|
case CRYPTO_HASH_ALG_MD5:
|
|
case CRYPTO_HASH_ALG_HMAC_MD5:
|
|
MD5Update(&ctx->u.md5, data, len);
|
|
break;
|
|
case CRYPTO_HASH_ALG_SHA1:
|
|
case CRYPTO_HASH_ALG_HMAC_SHA1:
|
|
SHA1Update(&ctx->u.sha1, data, len);
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
int crypto_hash_finish(struct crypto_hash *ctx, u8 *mac, size_t *len)
|
|
{
|
|
u8 k_pad[64];
|
|
size_t i;
|
|
|
|
if (ctx == NULL)
|
|
return -2;
|
|
|
|
if (mac == NULL || len == NULL) {
|
|
os_free(ctx);
|
|
return 0;
|
|
}
|
|
|
|
switch (ctx->alg) {
|
|
case CRYPTO_HASH_ALG_MD5:
|
|
if (*len < 16) {
|
|
*len = 16;
|
|
os_free(ctx);
|
|
return -1;
|
|
}
|
|
*len = 16;
|
|
MD5Final(mac, &ctx->u.md5);
|
|
break;
|
|
case CRYPTO_HASH_ALG_SHA1:
|
|
if (*len < 20) {
|
|
*len = 20;
|
|
os_free(ctx);
|
|
return -1;
|
|
}
|
|
*len = 20;
|
|
SHA1Final(mac, &ctx->u.sha1);
|
|
break;
|
|
case CRYPTO_HASH_ALG_HMAC_MD5:
|
|
if (*len < 16) {
|
|
*len = 16;
|
|
os_free(ctx);
|
|
return -1;
|
|
}
|
|
*len = 16;
|
|
|
|
MD5Final(mac, &ctx->u.md5);
|
|
|
|
os_memcpy(k_pad, ctx->key, ctx->key_len);
|
|
os_memset(k_pad + ctx->key_len, 0,
|
|
sizeof(k_pad) - ctx->key_len);
|
|
for (i = 0; i < sizeof(k_pad); i++)
|
|
k_pad[i] ^= 0x5c;
|
|
MD5Init(&ctx->u.md5);
|
|
MD5Update(&ctx->u.md5, k_pad, sizeof(k_pad));
|
|
MD5Update(&ctx->u.md5, mac, 16);
|
|
MD5Final(mac, &ctx->u.md5);
|
|
break;
|
|
case CRYPTO_HASH_ALG_HMAC_SHA1:
|
|
if (*len < 20) {
|
|
*len = 20;
|
|
os_free(ctx);
|
|
return -1;
|
|
}
|
|
*len = 20;
|
|
|
|
SHA1Final(mac, &ctx->u.sha1);
|
|
|
|
os_memcpy(k_pad, ctx->key, ctx->key_len);
|
|
os_memset(k_pad + ctx->key_len, 0,
|
|
sizeof(k_pad) - ctx->key_len);
|
|
for (i = 0; i < sizeof(k_pad); i++)
|
|
k_pad[i] ^= 0x5c;
|
|
SHA1Init(&ctx->u.sha1);
|
|
SHA1Update(&ctx->u.sha1, k_pad, sizeof(k_pad));
|
|
SHA1Update(&ctx->u.sha1, mac, 20);
|
|
SHA1Final(mac, &ctx->u.sha1);
|
|
break;
|
|
}
|
|
|
|
os_free(ctx);
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
struct crypto_cipher {
|
|
enum crypto_cipher_alg alg;
|
|
union {
|
|
struct {
|
|
size_t used_bytes;
|
|
u8 key[16];
|
|
size_t keylen;
|
|
} rc4;
|
|
struct {
|
|
u8 cbc[32];
|
|
size_t block_size;
|
|
void *ctx_enc;
|
|
void *ctx_dec;
|
|
} aes;
|
|
struct {
|
|
struct des3_key_s key;
|
|
u8 cbc[8];
|
|
} des3;
|
|
struct {
|
|
u32 ek[32];
|
|
u32 dk[32];
|
|
u8 cbc[8];
|
|
} des;
|
|
} u;
|
|
};
|
|
|
|
|
|
struct crypto_cipher * crypto_cipher_init(enum crypto_cipher_alg alg,
|
|
const u8 *iv, const u8 *key,
|
|
size_t key_len)
|
|
{
|
|
struct crypto_cipher *ctx;
|
|
|
|
ctx = os_zalloc(sizeof(*ctx));
|
|
if (ctx == NULL)
|
|
return NULL;
|
|
|
|
ctx->alg = alg;
|
|
|
|
switch (alg) {
|
|
case CRYPTO_CIPHER_ALG_RC4:
|
|
if (key_len > sizeof(ctx->u.rc4.key)) {
|
|
os_free(ctx);
|
|
return NULL;
|
|
}
|
|
ctx->u.rc4.keylen = key_len;
|
|
os_memcpy(ctx->u.rc4.key, key, key_len);
|
|
break;
|
|
case CRYPTO_CIPHER_ALG_AES:
|
|
if (key_len > sizeof(ctx->u.aes.cbc)) {
|
|
os_free(ctx);
|
|
return NULL;
|
|
}
|
|
ctx->u.aes.ctx_enc = aes_encrypt_init(key, key_len);
|
|
if (ctx->u.aes.ctx_enc == NULL) {
|
|
os_free(ctx);
|
|
return NULL;
|
|
}
|
|
ctx->u.aes.ctx_dec = aes_decrypt_init(key, key_len);
|
|
if (ctx->u.aes.ctx_dec == NULL) {
|
|
aes_encrypt_deinit(ctx->u.aes.ctx_enc);
|
|
os_free(ctx);
|
|
return NULL;
|
|
}
|
|
ctx->u.aes.block_size = key_len;
|
|
os_memcpy(ctx->u.aes.cbc, iv, ctx->u.aes.block_size);
|
|
break;
|
|
case CRYPTO_CIPHER_ALG_3DES:
|
|
if (key_len != 24) {
|
|
os_free(ctx);
|
|
return NULL;
|
|
}
|
|
des3_key_setup(key, &ctx->u.des3.key);
|
|
os_memcpy(ctx->u.des3.cbc, iv, 8);
|
|
break;
|
|
case CRYPTO_CIPHER_ALG_DES:
|
|
if (key_len != 8) {
|
|
os_free(ctx);
|
|
return NULL;
|
|
}
|
|
des_key_setup(key, ctx->u.des.ek, ctx->u.des.dk);
|
|
os_memcpy(ctx->u.des.cbc, iv, 8);
|
|
break;
|
|
default:
|
|
os_free(ctx);
|
|
return NULL;
|
|
}
|
|
|
|
return ctx;
|
|
}
|
|
|
|
|
|
int crypto_cipher_encrypt(struct crypto_cipher *ctx, const u8 *plain,
|
|
u8 *crypt, size_t len)
|
|
{
|
|
size_t i, j, blocks;
|
|
|
|
switch (ctx->alg) {
|
|
case CRYPTO_CIPHER_ALG_RC4:
|
|
if (plain != crypt)
|
|
os_memcpy(crypt, plain, len);
|
|
rc4_skip(ctx->u.rc4.key, ctx->u.rc4.keylen,
|
|
ctx->u.rc4.used_bytes, crypt, len);
|
|
ctx->u.rc4.used_bytes += len;
|
|
break;
|
|
case CRYPTO_CIPHER_ALG_AES:
|
|
if (len % ctx->u.aes.block_size)
|
|
return -1;
|
|
blocks = len / ctx->u.aes.block_size;
|
|
for (i = 0; i < blocks; i++) {
|
|
for (j = 0; j < ctx->u.aes.block_size; j++)
|
|
ctx->u.aes.cbc[j] ^= plain[j];
|
|
aes_encrypt(ctx->u.aes.ctx_enc, ctx->u.aes.cbc,
|
|
ctx->u.aes.cbc);
|
|
os_memcpy(crypt, ctx->u.aes.cbc,
|
|
ctx->u.aes.block_size);
|
|
plain += ctx->u.aes.block_size;
|
|
crypt += ctx->u.aes.block_size;
|
|
}
|
|
break;
|
|
case CRYPTO_CIPHER_ALG_3DES:
|
|
if (len % 8)
|
|
return -1;
|
|
blocks = len / 8;
|
|
for (i = 0; i < blocks; i++) {
|
|
for (j = 0; j < 8; j++)
|
|
ctx->u.des3.cbc[j] ^= plain[j];
|
|
des3_encrypt(ctx->u.des3.cbc, &ctx->u.des3.key,
|
|
ctx->u.des3.cbc);
|
|
os_memcpy(crypt, ctx->u.des3.cbc, 8);
|
|
plain += 8;
|
|
crypt += 8;
|
|
}
|
|
break;
|
|
case CRYPTO_CIPHER_ALG_DES:
|
|
if (len % 8)
|
|
return -1;
|
|
blocks = len / 8;
|
|
for (i = 0; i < blocks; i++) {
|
|
for (j = 0; j < 8; j++)
|
|
ctx->u.des3.cbc[j] ^= plain[j];
|
|
des_block_encrypt(ctx->u.des.cbc, ctx->u.des.ek,
|
|
ctx->u.des.cbc);
|
|
os_memcpy(crypt, ctx->u.des.cbc, 8);
|
|
plain += 8;
|
|
crypt += 8;
|
|
}
|
|
break;
|
|
default:
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
int crypto_cipher_decrypt(struct crypto_cipher *ctx, const u8 *crypt,
|
|
u8 *plain, size_t len)
|
|
{
|
|
size_t i, j, blocks;
|
|
u8 tmp[32];
|
|
|
|
switch (ctx->alg) {
|
|
case CRYPTO_CIPHER_ALG_RC4:
|
|
if (plain != crypt)
|
|
os_memcpy(plain, crypt, len);
|
|
rc4_skip(ctx->u.rc4.key, ctx->u.rc4.keylen,
|
|
ctx->u.rc4.used_bytes, plain, len);
|
|
ctx->u.rc4.used_bytes += len;
|
|
break;
|
|
case CRYPTO_CIPHER_ALG_AES:
|
|
if (len % ctx->u.aes.block_size)
|
|
return -1;
|
|
blocks = len / ctx->u.aes.block_size;
|
|
for (i = 0; i < blocks; i++) {
|
|
os_memcpy(tmp, crypt, ctx->u.aes.block_size);
|
|
aes_decrypt(ctx->u.aes.ctx_dec, crypt, plain);
|
|
for (j = 0; j < ctx->u.aes.block_size; j++)
|
|
plain[j] ^= ctx->u.aes.cbc[j];
|
|
os_memcpy(ctx->u.aes.cbc, tmp, ctx->u.aes.block_size);
|
|
plain += ctx->u.aes.block_size;
|
|
crypt += ctx->u.aes.block_size;
|
|
}
|
|
break;
|
|
case CRYPTO_CIPHER_ALG_3DES:
|
|
if (len % 8)
|
|
return -1;
|
|
blocks = len / 8;
|
|
for (i = 0; i < blocks; i++) {
|
|
os_memcpy(tmp, crypt, 8);
|
|
des3_decrypt(crypt, &ctx->u.des3.key, plain);
|
|
for (j = 0; j < 8; j++)
|
|
plain[j] ^= ctx->u.des3.cbc[j];
|
|
os_memcpy(ctx->u.des3.cbc, tmp, 8);
|
|
plain += 8;
|
|
crypt += 8;
|
|
}
|
|
break;
|
|
case CRYPTO_CIPHER_ALG_DES:
|
|
if (len % 8)
|
|
return -1;
|
|
blocks = len / 8;
|
|
for (i = 0; i < blocks; i++) {
|
|
os_memcpy(tmp, crypt, 8);
|
|
des_block_decrypt(crypt, ctx->u.des.dk, plain);
|
|
for (j = 0; j < 8; j++)
|
|
plain[j] ^= ctx->u.des.cbc[j];
|
|
os_memcpy(ctx->u.des.cbc, tmp, 8);
|
|
plain += 8;
|
|
crypt += 8;
|
|
}
|
|
break;
|
|
default:
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
void crypto_cipher_deinit(struct crypto_cipher *ctx)
|
|
{
|
|
switch (ctx->alg) {
|
|
case CRYPTO_CIPHER_ALG_AES:
|
|
aes_encrypt_deinit(ctx->u.aes.ctx_enc);
|
|
aes_decrypt_deinit(ctx->u.aes.ctx_dec);
|
|
break;
|
|
case CRYPTO_CIPHER_ALG_3DES:
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
os_free(ctx);
|
|
}
|
|
|
|
|
|
/* Dummy structures; these are just typecast to struct crypto_rsa_key */
|
|
struct crypto_public_key;
|
|
struct crypto_private_key;
|
|
|
|
|
|
struct crypto_public_key * crypto_public_key_import(const u8 *key, size_t len)
|
|
{
|
|
return (struct crypto_public_key *)
|
|
crypto_rsa_import_public_key(key, len);
|
|
}
|
|
|
|
|
|
struct crypto_private_key * crypto_private_key_import(const u8 *key,
|
|
size_t len,
|
|
const char *passwd)
|
|
{
|
|
struct crypto_private_key *res;
|
|
|
|
/* First, check for possible PKCS #8 encoding */
|
|
res = pkcs8_key_import(key, len);
|
|
if (res)
|
|
return res;
|
|
|
|
if (passwd) {
|
|
/* Try to parse as encrypted PKCS #8 */
|
|
res = pkcs8_enc_key_import(key, len, passwd);
|
|
if (res)
|
|
return res;
|
|
}
|
|
|
|
/* Not PKCS#8, so try to import PKCS #1 encoded RSA private key */
|
|
wpa_printf(MSG_DEBUG, "Trying to parse PKCS #1 encoded RSA private "
|
|
"key");
|
|
return (struct crypto_private_key *)
|
|
crypto_rsa_import_private_key(key, len);
|
|
}
|
|
|
|
|
|
struct crypto_public_key * crypto_public_key_from_cert(const u8 *buf,
|
|
size_t len)
|
|
{
|
|
/* No X.509 support in crypto_internal.c */
|
|
return NULL;
|
|
}
|
|
|
|
|
|
int crypto_public_key_encrypt_pkcs1_v15(struct crypto_public_key *key,
|
|
const u8 *in, size_t inlen,
|
|
u8 *out, size_t *outlen)
|
|
{
|
|
return pkcs1_encrypt(2, (struct crypto_rsa_key *) key,
|
|
0, in, inlen, out, outlen);
|
|
}
|
|
|
|
|
|
int crypto_private_key_decrypt_pkcs1_v15(struct crypto_private_key *key,
|
|
const u8 *in, size_t inlen,
|
|
u8 *out, size_t *outlen)
|
|
{
|
|
return pkcs1_v15_private_key_decrypt((struct crypto_rsa_key *) key,
|
|
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 pkcs1_encrypt(1, (struct crypto_rsa_key *) key,
|
|
1, in, inlen, out, outlen);
|
|
}
|
|
|
|
|
|
void crypto_public_key_free(struct crypto_public_key *key)
|
|
{
|
|
crypto_rsa_free((struct crypto_rsa_key *) key);
|
|
}
|
|
|
|
|
|
void crypto_private_key_free(struct crypto_private_key *key)
|
|
{
|
|
crypto_rsa_free((struct crypto_rsa_key *) 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)
|
|
{
|
|
return pkcs1_decrypt_public_key((struct crypto_rsa_key *) key,
|
|
crypt, crypt_len, plain, plain_len);
|
|
}
|
|
|
|
|
|
int crypto_global_init(void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
|
|
void crypto_global_deinit(void)
|
|
{
|
|
}
|
|
|
|
|
|
#ifdef CONFIG_MODEXP
|
|
|
|
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)
|
|
{
|
|
struct bignum *bn_base, *bn_exp, *bn_modulus, *bn_result;
|
|
int ret = -1;
|
|
|
|
bn_base = bignum_init();
|
|
bn_exp = bignum_init();
|
|
bn_modulus = bignum_init();
|
|
bn_result = bignum_init();
|
|
|
|
if (bn_base == NULL || bn_exp == NULL || bn_modulus == NULL ||
|
|
bn_result == NULL)
|
|
goto error;
|
|
|
|
if (bignum_set_unsigned_bin(bn_base, base, base_len) < 0 ||
|
|
bignum_set_unsigned_bin(bn_exp, power, power_len) < 0 ||
|
|
bignum_set_unsigned_bin(bn_modulus, modulus, modulus_len) < 0)
|
|
goto error;
|
|
|
|
if (bignum_exptmod(bn_base, bn_exp, bn_modulus, bn_result) < 0)
|
|
goto error;
|
|
|
|
ret = bignum_get_unsigned_bin(bn_result, result, result_len);
|
|
|
|
error:
|
|
bignum_deinit(bn_base);
|
|
bignum_deinit(bn_exp);
|
|
bignum_deinit(bn_modulus);
|
|
bignum_deinit(bn_result);
|
|
return ret;
|
|
}
|
|
|
|
#endif /* CONFIG_MODEXP */
|