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/*
* WPA Supplicant / wrapper functions for libgcrypt
* Copyright (c) 2004-2017, Jouni Malinen <j@w1.fi>
*
* This software may be distributed under the terms of the BSD license.
* See README for more details.
*/
#include "includes.h"
#include <gcrypt.h>
#include "common.h"
#include "md5.h"
#include "sha1.h"
#include "sha256.h"
#include "sha384.h"
#include "sha512.h"
#include "crypto.h"
static int gnutls_digest_vector(int algo, size_t num_elem,
const u8 *addr[], const size_t *len, u8 *mac)
{
gcry_md_hd_t hd;
unsigned char *p;
size_t i;
if (TEST_FAIL())
return -1;
if (gcry_md_open(&hd, algo, 0) != GPG_ERR_NO_ERROR)
return -1;
for (i = 0; i < num_elem; i++)
gcry_md_write(hd, addr[i], len[i]);
p = gcry_md_read(hd, algo);
if (p)
memcpy(mac, p, gcry_md_get_algo_dlen(algo));
gcry_md_close(hd);
return 0;
}
int md4_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac)
{
return gnutls_digest_vector(GCRY_MD_MD4, num_elem, addr, len, mac);
}
int des_encrypt(const u8 *clear, const u8 *key, u8 *cypher)
{
gcry_cipher_hd_t hd;
u8 pkey[8], next, tmp;
int i;
/* Add parity bits to the key */
next = 0;
for (i = 0; i < 7; i++) {
tmp = key[i];
pkey[i] = (tmp >> i) | next | 1;
next = tmp << (7 - i);
}
pkey[i] = next | 1;
gcry_cipher_open(&hd, GCRY_CIPHER_DES, GCRY_CIPHER_MODE_ECB, 0);
gcry_err_code(gcry_cipher_setkey(hd, pkey, 8));
gcry_cipher_encrypt(hd, cypher, 8, clear, 8);
gcry_cipher_close(hd);
return 0;
}
int md5_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac)
{
return gnutls_digest_vector(GCRY_MD_MD5, num_elem, addr, len, mac);
}
int sha1_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac)
{
return gnutls_digest_vector(GCRY_MD_SHA1, num_elem, addr, len, mac);
}
int sha256_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac)
{
return gnutls_digest_vector(GCRY_MD_SHA256, num_elem, addr, len, mac);
}
int sha384_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac)
{
return gnutls_digest_vector(GCRY_MD_SHA384, num_elem, addr, len, mac);
}
int sha512_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac)
{
return gnutls_digest_vector(GCRY_MD_SHA512, num_elem, addr, len, mac);
}
static int gnutls_hmac_vector(int algo, const u8 *key, size_t key_len,
size_t num_elem, const u8 *addr[],
const size_t *len, u8 *mac)
{
gcry_md_hd_t hd;
unsigned char *p;
size_t i;
if (TEST_FAIL())
return -1;
if (gcry_md_open(&hd, algo, GCRY_MD_FLAG_HMAC) != GPG_ERR_NO_ERROR)
return -1;
if (gcry_md_setkey(hd, key, key_len) != GPG_ERR_NO_ERROR) {
gcry_md_close(hd);
return -1;
}
for (i = 0; i < num_elem; i++)
gcry_md_write(hd, addr[i], len[i]);
p = gcry_md_read(hd, algo);
if (p)
memcpy(mac, p, gcry_md_get_algo_dlen(algo));
gcry_md_close(hd);
return 0;
}
int hmac_md5_vector(const u8 *key, size_t key_len, size_t num_elem,
const u8 *addr[], const size_t *len, u8 *mac)
{
return gnutls_hmac_vector(GCRY_MD_MD5, key, key_len, num_elem, addr,
len, mac);
}
int hmac_md5(const u8 *key, size_t key_len, const u8 *data, size_t data_len,
u8 *mac)
{
return hmac_md5_vector(key, key_len, 1, &data, &data_len, mac);
}
int hmac_sha1_vector(const u8 *key, size_t key_len, size_t num_elem,
const u8 *addr[], const size_t *len, u8 *mac)
{
return gnutls_hmac_vector(GCRY_MD_SHA1, key, key_len, num_elem, addr,
len, mac);
}
int hmac_sha1(const u8 *key, size_t key_len, const u8 *data, size_t data_len,
u8 *mac)
{
return hmac_sha1_vector(key, key_len, 1, &data, &data_len, mac);
}
#ifdef CONFIG_SHA256
int hmac_sha256_vector(const u8 *key, size_t key_len, size_t num_elem,
const u8 *addr[], const size_t *len, u8 *mac)
{
return gnutls_hmac_vector(GCRY_MD_SHA256, key, key_len, num_elem, addr,
len, mac);
}
int hmac_sha256(const u8 *key, size_t key_len, const u8 *data,
size_t data_len, u8 *mac)
{
return hmac_sha256_vector(key, key_len, 1, &data, &data_len, mac);
}
#endif /* CONFIG_SHA256 */
#ifdef CONFIG_SHA384
int hmac_sha384_vector(const u8 *key, size_t key_len, size_t num_elem,
const u8 *addr[], const size_t *len, u8 *mac)
{
return gnutls_hmac_vector(GCRY_MD_SHA384, key, key_len, num_elem, addr,
len, mac);
}
int hmac_sha384(const u8 *key, size_t key_len, const u8 *data,
size_t data_len, u8 *mac)
{
return hmac_sha384_vector(key, key_len, 1, &data, &data_len, mac);
}
#endif /* CONFIG_SHA384 */
#ifdef CONFIG_SHA512
int hmac_sha512_vector(const u8 *key, size_t key_len, size_t num_elem,
const u8 *addr[], const size_t *len, u8 *mac)
{
return gnutls_hmac_vector(GCRY_MD_SHA512, key, key_len, num_elem, addr,
len, mac);
}
int hmac_sha512(const u8 *key, size_t key_len, const u8 *data,
size_t data_len, u8 *mac)
{
return hmac_sha512_vector(key, key_len, 1, &data, &data_len, mac);
}
#endif /* CONFIG_SHA512 */
void * aes_encrypt_init(const u8 *key, size_t len)
{
gcry_cipher_hd_t hd;
if (TEST_FAIL())
return NULL;
if (gcry_cipher_open(&hd, GCRY_CIPHER_AES, GCRY_CIPHER_MODE_ECB, 0) !=
GPG_ERR_NO_ERROR) {
printf("cipher open failed\n");
return NULL;
}
if (gcry_cipher_setkey(hd, key, len) != GPG_ERR_NO_ERROR) {
printf("setkey failed\n");
gcry_cipher_close(hd);
return NULL;
}
return hd;
}
int aes_encrypt(void *ctx, const u8 *plain, u8 *crypt)
{
gcry_cipher_hd_t hd = ctx;
gcry_cipher_encrypt(hd, crypt, 16, plain, 16);
return 0;
}
void aes_encrypt_deinit(void *ctx)
{
gcry_cipher_hd_t hd = ctx;
gcry_cipher_close(hd);
}
void * aes_decrypt_init(const u8 *key, size_t len)
{
gcry_cipher_hd_t hd;
if (TEST_FAIL())
return NULL;
if (gcry_cipher_open(&hd, GCRY_CIPHER_AES, GCRY_CIPHER_MODE_ECB, 0) !=
GPG_ERR_NO_ERROR)
return NULL;
if (gcry_cipher_setkey(hd, key, len) != GPG_ERR_NO_ERROR) {
gcry_cipher_close(hd);
return NULL;
}
return hd;
}
int aes_decrypt(void *ctx, const u8 *crypt, u8 *plain)
{
gcry_cipher_hd_t hd = ctx;
gcry_cipher_decrypt(hd, plain, 16, crypt, 16);
return 0;
}
void aes_decrypt_deinit(void *ctx)
{
gcry_cipher_hd_t hd = ctx;
gcry_cipher_close(hd);
}
int crypto_dh_init(u8 generator, const u8 *prime, size_t prime_len, u8 *privkey,
u8 *pubkey)
{
size_t pubkey_len, pad;
if (os_get_random(privkey, prime_len) < 0)
return -1;
if (os_memcmp(privkey, prime, prime_len) > 0) {
/* Make sure private value is smaller than prime */
privkey[0] = 0;
}
pubkey_len = prime_len;
if (crypto_mod_exp(&generator, 1, privkey, prime_len, prime, prime_len,
pubkey, &pubkey_len) < 0)
return -1;
if (pubkey_len < prime_len) {
pad = prime_len - pubkey_len;
os_memmove(pubkey + pad, pubkey, pubkey_len);
os_memset(pubkey, 0, pad);
}
return 0;
}
int crypto_dh_derive_secret(u8 generator, const u8 *prime, size_t prime_len,
const u8 *order, size_t order_len,
const u8 *privkey, size_t privkey_len,
const u8 *pubkey, size_t pubkey_len,
u8 *secret, size_t *len)
{
gcry_mpi_t pub = NULL;
int res = -1;
if (pubkey_len > prime_len ||
(pubkey_len == prime_len &&
os_memcmp(pubkey, prime, prime_len) >= 0))
return -1;
if (gcry_mpi_scan(&pub, GCRYMPI_FMT_USG, pubkey, pubkey_len, NULL) !=
GPG_ERR_NO_ERROR ||
gcry_mpi_cmp_ui(pub, 1) <= 0)
goto fail;
if (order) {
gcry_mpi_t p = NULL, q = NULL, tmp;
int failed;
/* verify: pubkey^q == 1 mod p */
tmp = gcry_mpi_new(prime_len * 8);
failed = !tmp ||
gcry_mpi_scan(&p, GCRYMPI_FMT_USG, prime, prime_len,
NULL) != GPG_ERR_NO_ERROR ||
gcry_mpi_scan(&q, GCRYMPI_FMT_USG, order, order_len,
NULL) != GPG_ERR_NO_ERROR;
if (!failed) {
gcry_mpi_powm(tmp, pub, q, p);
failed = gcry_mpi_cmp_ui(tmp, 1) != 0;
}
gcry_mpi_release(p);
gcry_mpi_release(q);
gcry_mpi_release(tmp);
if (failed)
goto fail;
}
res = crypto_mod_exp(pubkey, pubkey_len, privkey, privkey_len,
prime, prime_len, secret, len);
fail:
gcry_mpi_release(pub);
return res;
}
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)
{
gcry_mpi_t bn_base = NULL, bn_exp = NULL, bn_modulus = NULL,
bn_result = NULL;
int ret = -1;
if (gcry_mpi_scan(&bn_base, GCRYMPI_FMT_USG, base, base_len, NULL) !=
GPG_ERR_NO_ERROR ||
gcry_mpi_scan(&bn_exp, GCRYMPI_FMT_USG, power, power_len, NULL) !=
GPG_ERR_NO_ERROR ||
gcry_mpi_scan(&bn_modulus, GCRYMPI_FMT_USG, modulus, modulus_len,
NULL) != GPG_ERR_NO_ERROR)
goto error;
bn_result = gcry_mpi_new(modulus_len * 8);
gcry_mpi_powm(bn_result, bn_base, bn_exp, bn_modulus);
if (gcry_mpi_print(GCRYMPI_FMT_USG, result, *result_len, result_len,
bn_result) != GPG_ERR_NO_ERROR)
goto error;
ret = 0;
error:
gcry_mpi_release(bn_base);
gcry_mpi_release(bn_exp);
gcry_mpi_release(bn_modulus);
gcry_mpi_release(bn_result);
return ret;
}
struct crypto_cipher {
gcry_cipher_hd_t enc;
gcry_cipher_hd_t dec;
};
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;
gcry_error_t res;
enum gcry_cipher_algos a;
int ivlen;
ctx = os_zalloc(sizeof(*ctx));
if (ctx == NULL)
return NULL;
switch (alg) {
case CRYPTO_CIPHER_ALG_RC4:
a = GCRY_CIPHER_ARCFOUR;
res = gcry_cipher_open(&ctx->enc, a, GCRY_CIPHER_MODE_STREAM,
0);
gcry_cipher_open(&ctx->dec, a, GCRY_CIPHER_MODE_STREAM, 0);
break;
case CRYPTO_CIPHER_ALG_AES:
if (key_len == 24)
a = GCRY_CIPHER_AES192;
else if (key_len == 32)
a = GCRY_CIPHER_AES256;
else
a = GCRY_CIPHER_AES;
res = gcry_cipher_open(&ctx->enc, a, GCRY_CIPHER_MODE_CBC, 0);
gcry_cipher_open(&ctx->dec, a, GCRY_CIPHER_MODE_CBC, 0);
break;
case CRYPTO_CIPHER_ALG_3DES:
a = GCRY_CIPHER_3DES;
res = gcry_cipher_open(&ctx->enc, a, GCRY_CIPHER_MODE_CBC, 0);
gcry_cipher_open(&ctx->dec, a, GCRY_CIPHER_MODE_CBC, 0);
break;
case CRYPTO_CIPHER_ALG_DES:
a = GCRY_CIPHER_DES;
res = gcry_cipher_open(&ctx->enc, a, GCRY_CIPHER_MODE_CBC, 0);
gcry_cipher_open(&ctx->dec, a, GCRY_CIPHER_MODE_CBC, 0);
break;
case CRYPTO_CIPHER_ALG_RC2:
if (key_len == 5)
a = GCRY_CIPHER_RFC2268_40;
else
a = GCRY_CIPHER_RFC2268_128;
res = gcry_cipher_open(&ctx->enc, a, GCRY_CIPHER_MODE_CBC, 0);
gcry_cipher_open(&ctx->dec, a, GCRY_CIPHER_MODE_CBC, 0);
break;
default:
os_free(ctx);
return NULL;
}
if (res != GPG_ERR_NO_ERROR) {
os_free(ctx);
return NULL;
}
if (gcry_cipher_setkey(ctx->enc, key, key_len) != GPG_ERR_NO_ERROR ||
gcry_cipher_setkey(ctx->dec, key, key_len) != GPG_ERR_NO_ERROR) {
gcry_cipher_close(ctx->enc);
gcry_cipher_close(ctx->dec);
os_free(ctx);
return NULL;
}
ivlen = gcry_cipher_get_algo_blklen(a);
if (gcry_cipher_setiv(ctx->enc, iv, ivlen) != GPG_ERR_NO_ERROR ||
gcry_cipher_setiv(ctx->dec, iv, ivlen) != GPG_ERR_NO_ERROR) {
gcry_cipher_close(ctx->enc);
gcry_cipher_close(ctx->dec);
os_free(ctx);
return NULL;
}
return ctx;
}
int crypto_cipher_encrypt(struct crypto_cipher *ctx, const u8 *plain,
u8 *crypt, size_t len)
{
if (gcry_cipher_encrypt(ctx->enc, crypt, len, plain, len) !=
GPG_ERR_NO_ERROR)
return -1;
return 0;
}
int crypto_cipher_decrypt(struct crypto_cipher *ctx, const u8 *crypt,
u8 *plain, size_t len)
{
if (gcry_cipher_decrypt(ctx->dec, plain, len, crypt, len) !=
GPG_ERR_NO_ERROR)
return -1;
return 0;
}
void crypto_cipher_deinit(struct crypto_cipher *ctx)
{
gcry_cipher_close(ctx->enc);
gcry_cipher_close(ctx->dec);
os_free(ctx);
}
void crypto_unload(void)
{
}