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|
/*
* Copyright (C) 2010 Free Software Foundation, Inc.
*
* Author: Nikos Mavrogiannopoulos
*
* This file is part of GNUTLS.
*
* The GNUTLS library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA
*
*/
/* This file contains the functions needed for RSA/DSA public key
* encryption and signatures.
*/
#include <gnutls_int.h>
#include <gnutls_mpi.h>
#include <gnutls_pk.h>
#include <gnutls_errors.h>
#include <gnutls_datum.h>
#include <gnutls_global.h>
#include <gnutls_num.h>
#include <x509/x509_int.h>
#include <x509/common.h>
#include <random.h>
#include <gnutls_pk.h>
#include <nettle/dsa.h>
#include <nettle/rsa.h>
#include <random.h>
#include <gnutls/crypto.h>
#include "ecc.h"
#define TOMPZ(x) (*((mpz_t*)(x)))
static inline int is_supported_curve(int curve);
static void
rnd_func (void *_ctx, unsigned length, uint8_t * data)
{
gnutls_rnd (GNUTLS_RND_RANDOM, data, length);
}
static void
_dsa_params_to_pubkey (const gnutls_pk_params_st * pk_params,
struct dsa_public_key *pub)
{
memcpy (&pub->p, pk_params->params[0], sizeof (mpz_t));
memcpy (&pub->q, pk_params->params[1], sizeof (mpz_t));
memcpy (&pub->g, pk_params->params[2], sizeof (mpz_t));
memcpy (&pub->y, pk_params->params[3], sizeof (mpz_t));
}
static void
_dsa_params_to_privkey (const gnutls_pk_params_st * pk_params,
struct dsa_private_key *pub)
{
memcpy (&pub->x, pk_params->params[4], sizeof (mpz_t));
}
static void
_rsa_params_to_privkey (const gnutls_pk_params_st * pk_params,
struct rsa_private_key *priv)
{
memcpy (&priv->d, pk_params->params[2], sizeof (mpz_t));
memcpy (&priv->p, pk_params->params[3], sizeof (mpz_t));
memcpy (&priv->q, pk_params->params[4], sizeof (mpz_t));
memcpy (&priv->c, pk_params->params[5], sizeof (mpz_t));
memcpy (&priv->a, pk_params->params[6], sizeof (mpz_t));
memcpy (&priv->b, pk_params->params[7], sizeof (mpz_t));
}
static void
_ecc_params_to_privkey(const gnutls_pk_params_st * pk_params,
ecc_key * priv)
{
priv->type = PK_PRIVATE;
memcpy(&priv->prime, pk_params->params[0], sizeof(mpz_t));
memcpy(&priv->order, pk_params->params[1], sizeof(mpz_t));
memcpy(&priv->A, pk_params->params[2], sizeof(mpz_t));
memcpy(&priv->Gx, pk_params->params[3], sizeof(mpz_t));
memcpy(&priv->Gy, pk_params->params[4], sizeof(mpz_t));
memcpy(&priv->pubkey.x, pk_params->params[5], sizeof(mpz_t));
memcpy(&priv->pubkey.y, pk_params->params[6], sizeof(mpz_t));
memcpy(&priv->k, pk_params->params[7], sizeof(mpz_t));
mpz_init_set_ui(priv->pubkey.z, 1);
}
static void
_ecc_params_to_pubkey(const gnutls_pk_params_st * pk_params,
ecc_key * pub)
{
pub->type = PK_PUBLIC;
memcpy(&pub->prime, pk_params->params[0], sizeof(mpz_t));
memcpy(&pub->order, pk_params->params[1], sizeof(mpz_t));
memcpy(&pub->A, pk_params->params[2], sizeof(mpz_t));
memcpy(&pub->Gx, pk_params->params[3], sizeof(mpz_t));
memcpy(&pub->Gy, pk_params->params[4], sizeof(mpz_t));
memcpy(&pub->pubkey.x, pk_params->params[5], sizeof(mpz_t));
memcpy(&pub->pubkey.y, pk_params->params[6], sizeof(mpz_t));
mpz_init_set_ui(pub->pubkey.z, 1);
}
static int _wrap_nettle_pk_derive(gnutls_pk_algorithm_t algo, gnutls_datum_t * out,
const gnutls_pk_params_st * priv,
const gnutls_pk_params_st * pub)
{
int ret;
switch (algo)
{
case GNUTLS_PK_ECC:
{
ecc_key ecc_pub, ecc_priv;
int curve = priv->flags;
unsigned long sz;
if (is_supported_curve(curve) == 0)
return gnutls_assert_val(GNUTLS_E_ECC_NO_SUPPORTED_CURVES);
_ecc_params_to_pubkey(pub, &ecc_pub);
_ecc_params_to_privkey(priv, &ecc_priv);
sz = ECC_BUF_SIZE;
out->data = gnutls_malloc(sz);
if (out->data == NULL)
return gnutls_assert_val(GNUTLS_E_MEMORY_ERROR);
ret = ecc_shared_secret(&ecc_priv, &ecc_pub, out->data, &sz);
if (ret != 0)
{
gnutls_free(out->data);
return gnutls_assert_val(GNUTLS_E_INTERNAL_ERROR);
}
out->size = sz;
break;
}
default:
gnutls_assert ();
ret = GNUTLS_E_INTERNAL_ERROR;
goto cleanup;
}
ret = 0;
cleanup:
return ret;
}
static int
_wrap_nettle_pk_encrypt (gnutls_pk_algorithm_t algo,
gnutls_datum_t * ciphertext,
const gnutls_datum_t * plaintext,
const gnutls_pk_params_st * pk_params)
{
int ret;
switch (algo)
{
case GNUTLS_PK_RSA:
{
bigint_t p;
if (_gnutls_mpi_scan_nz (&p, plaintext->data, plaintext->size) != 0)
{
gnutls_assert ();
return GNUTLS_E_MPI_SCAN_FAILED;
}
mpz_powm (p, p, TOMPZ (pk_params->params[1]) /*e */ ,
TOMPZ (pk_params->params[0] /*m */ ));
ret = _gnutls_mpi_dprint_size (p, ciphertext, plaintext->size);
_gnutls_mpi_release (&p);
if (ret < 0)
{
gnutls_assert ();
goto cleanup;
}
break;
}
default:
gnutls_assert ();
ret = GNUTLS_E_INTERNAL_ERROR;
goto cleanup;
}
ret = 0;
cleanup:
return ret;
}
/* returns the blinded c and the inverse of a random
* number r;
*/
static bigint_t
rsa_blind (bigint_t c, bigint_t e, bigint_t n, bigint_t * _ri)
{
bigint_t nc = NULL, r = NULL, ri = NULL;
/* nc = c*(r^e)
* ri = r^(-1)
*/
nc = _gnutls_mpi_alloc_like (n);
if (nc == NULL)
{
gnutls_assert ();
return NULL;
}
ri = _gnutls_mpi_alloc_like (n);
if (nc == NULL)
{
gnutls_assert ();
goto fail;
}
r = _gnutls_mpi_randomize (NULL, _gnutls_mpi_get_nbits (n),
GNUTLS_RND_NONCE);
if (r == NULL)
{
gnutls_assert ();
goto fail;
}
/* invert r */
if (mpz_invert (ri, r, n) == 0)
{
gnutls_assert ();
goto fail;
}
/* r = r^e */
_gnutls_mpi_powm (r, r, e, n);
_gnutls_mpi_mulm (nc, c, r, n);
*_ri = ri;
_gnutls_mpi_release (&r);
return nc;
fail:
_gnutls_mpi_release (&nc);
_gnutls_mpi_release (&r);
return NULL;
}
/* c = c*ri mod n
*/
static inline void
rsa_unblind (bigint_t c, bigint_t ri, bigint_t n)
{
_gnutls_mpi_mulm (c, c, ri, n);
}
static int
_wrap_nettle_pk_decrypt (gnutls_pk_algorithm_t algo,
gnutls_datum_t * plaintext,
const gnutls_datum_t * ciphertext,
const gnutls_pk_params_st * pk_params)
{
int ret;
/* make a sexp from pkey */
switch (algo)
{
case GNUTLS_PK_RSA:
{
struct rsa_private_key priv;
bigint_t c, ri, nc;
if (_gnutls_mpi_scan_nz (&c, ciphertext->data, ciphertext->size) != 0)
{
gnutls_assert ();
return GNUTLS_E_MPI_SCAN_FAILED;
}
nc = rsa_blind (c, pk_params->params[1] /*e */ ,
pk_params->params[0] /*m */ , &ri);
_gnutls_mpi_release (&c);
if (nc == NULL)
{
gnutls_assert ();
return GNUTLS_E_MEMORY_ERROR;
}
memset(&priv, 0, sizeof(priv));
_rsa_params_to_privkey (pk_params, &priv);
rsa_compute_root (&priv, TOMPZ (nc), TOMPZ (nc));
rsa_unblind (nc, ri, pk_params->params[0] /*m */ );
ret = _gnutls_mpi_dprint_size (nc, plaintext, ciphertext->size);
_gnutls_mpi_release (&nc);
_gnutls_mpi_release (&ri);
if (ret < 0)
{
gnutls_assert ();
goto cleanup;
}
break;
}
default:
gnutls_assert ();
ret = GNUTLS_E_INTERNAL_ERROR;
goto cleanup;
}
ret = 0;
cleanup:
return ret;
}
/* in case of DSA puts into data, r,s
*/
static int
_wrap_nettle_pk_sign (gnutls_pk_algorithm_t algo,
gnutls_datum_t * signature,
const gnutls_datum_t * vdata,
const gnutls_pk_params_st * pk_params)
{
int ret, hash;
switch (algo)
{
case GNUTLS_PK_ECC: /* we do ECDSA */
{
ecc_key priv;
struct dsa_signature sig;
int hash_len;
_ecc_params_to_privkey(pk_params, &priv);
dsa_signature_init (&sig);
hash = _gnutls_dsa_q_to_hash (algo, pk_params);
hash_len = _gnutls_hash_get_algo_len (hash);
if (hash_len > vdata->size)
{
gnutls_assert ();
_gnutls_debug_log("Security level of algorithm requires hash %s or better\n", gnutls_mac_get_name(hash));
}
ret = ecc_sign_hash(vdata->data, vdata->size,
&sig, NULL, rnd_func, &priv);
if (ret != 0)
{
gnutls_assert ();
ret = GNUTLS_E_PK_SIGN_FAILED;
goto ecdsa_fail;
}
ret = _gnutls_encode_ber_rs (signature, &sig.r, &sig.s);
ecdsa_fail:
dsa_signature_clear (&sig);
if (ret < 0)
{
gnutls_assert ();
goto cleanup;
}
break;
}
case GNUTLS_PK_DSA:
{
struct dsa_public_key pub;
struct dsa_private_key priv;
struct dsa_signature sig;
int hash_len;
memset(&priv, 0, sizeof(priv));
memset(&pub, 0, sizeof(pub));
_dsa_params_to_pubkey (pk_params, &pub);
_dsa_params_to_privkey (pk_params, &priv);
dsa_signature_init (&sig);
hash = _gnutls_dsa_q_to_hash (algo, pk_params);
hash_len = _gnutls_hash_get_algo_len (hash);
if (hash_len > vdata->size)
{
gnutls_assert ();
_gnutls_debug_log("Security level of algorithm requires hash %s or better\n", gnutls_mac_get_name(hash));
}
ret =
_dsa_sign (&pub, &priv, NULL, rnd_func,
hash_len, vdata->data, &sig);
if (ret == 0)
{
gnutls_assert ();
ret = GNUTLS_E_PK_SIGN_FAILED;
goto dsa_fail;
}
ret = _gnutls_encode_ber_rs (signature, &sig.r, &sig.s);
dsa_fail:
dsa_signature_clear (&sig);
if (ret < 0)
{
gnutls_assert ();
goto cleanup;
}
break;
}
case GNUTLS_PK_RSA:
{
struct rsa_private_key priv;
bigint_t hash, nc, ri;
if (_gnutls_mpi_scan_nz (&hash, vdata->data, vdata->size) != 0)
{
gnutls_assert ();
return GNUTLS_E_MPI_SCAN_FAILED;
}
memset(&priv, 0, sizeof(priv));
_rsa_params_to_privkey (pk_params, &priv);
nc = rsa_blind (hash, pk_params->params[1] /*e */ ,
pk_params->params[0] /*m */ , &ri);
_gnutls_mpi_release (&hash);
if (nc == NULL)
{
gnutls_assert ();
ret = GNUTLS_E_MEMORY_ERROR;
goto rsa_fail;
}
rsa_compute_root (&priv, TOMPZ (nc), TOMPZ (nc));
rsa_unblind (nc, ri, pk_params->params[0] /*m */ );
ret = _gnutls_mpi_dprint (nc, signature);
rsa_fail:
_gnutls_mpi_release (&nc);
_gnutls_mpi_release (&ri);
if (ret < 0)
{
gnutls_assert ();
goto cleanup;
}
break;
}
default:
gnutls_assert ();
ret = GNUTLS_E_INTERNAL_ERROR;
goto cleanup;
}
ret = 0;
cleanup:
return ret;
}
static int
_int_rsa_verify (const gnutls_pk_params_st * pk_params,
bigint_t m, bigint_t s)
{
int res;
mpz_t m1;
if ((mpz_sgn (TOMPZ (s)) <= 0)
|| (mpz_cmp (TOMPZ (s), TOMPZ (pk_params->params[0])) >= 0))
return GNUTLS_E_PK_SIG_VERIFY_FAILED;
mpz_init (m1);
mpz_powm (m1, TOMPZ (s), TOMPZ (pk_params->params[1]),
TOMPZ (pk_params->params[0]));
res = !mpz_cmp (TOMPZ (m), m1);
mpz_clear (m1);
if (res == 0)
res = GNUTLS_E_PK_SIG_VERIFY_FAILED;
else
res = 0;
return res;
}
static int
_wrap_nettle_pk_verify (gnutls_pk_algorithm_t algo,
const gnutls_datum_t * vdata,
const gnutls_datum_t * signature,
const gnutls_pk_params_st * pk_params)
{
int ret, hash;
bigint_t tmp[2] = { NULL, NULL };
switch (algo)
{
case GNUTLS_PK_ECC: /* ECDSA */
{
ecc_key pub;
struct dsa_signature sig;
int stat;
ret = _gnutls_decode_ber_rs (signature, &tmp[0], &tmp[1]);
if (ret < 0)
{
gnutls_assert ();
goto cleanup;
}
_ecc_params_to_pubkey(pk_params, &pub);
memcpy (&sig.r, tmp[0], sizeof (sig.r));
memcpy (&sig.s, tmp[1], sizeof (sig.s));
hash = _gnutls_dsa_q_to_hash (algo, pk_params);
if (vdata->size != _gnutls_hash_get_algo_len (hash))
{
gnutls_assert ();
if (vdata->size < 20)
{
ret = GNUTLS_E_PK_SIG_VERIFY_FAILED;
goto ecdsa_fail;
}
}
ret = ecc_verify_hash(&sig, vdata->data, vdata->size, &stat, &pub);
if (ret != 0 || stat != 1)
{
gnutls_assert();
ret = GNUTLS_E_PK_SIG_VERIFY_FAILED;
}
else
ret = 0;
ecdsa_fail:
_gnutls_mpi_release (&tmp[0]);
_gnutls_mpi_release (&tmp[1]);
break;
}
case GNUTLS_PK_DSA:
{
struct dsa_public_key pub;
struct dsa_signature sig;
ret = _gnutls_decode_ber_rs (signature, &tmp[0], &tmp[1]);
if (ret < 0)
{
gnutls_assert ();
goto cleanup;
}
memset(&pub, 0, sizeof(pub));
_dsa_params_to_pubkey (pk_params, &pub);
memcpy (&sig.r, tmp[0], sizeof (sig.r));
memcpy (&sig.s, tmp[1], sizeof (sig.s));
hash = _gnutls_dsa_q_to_hash (algo, pk_params);
if (vdata->size != _gnutls_hash_get_algo_len (hash))
{
gnutls_assert ();
if (vdata->size < 20)
{
ret = GNUTLS_E_PK_SIG_VERIFY_FAILED;
goto dsa_fail;
}
}
ret = _dsa_verify (&pub, vdata->size, vdata->data, &sig);
if (ret == 0)
{
gnutls_assert();
ret = GNUTLS_E_PK_SIG_VERIFY_FAILED;
}
else
ret = 0;
dsa_fail:
_gnutls_mpi_release (&tmp[0]);
_gnutls_mpi_release (&tmp[1]);
break;
}
case GNUTLS_PK_RSA:
{
bigint_t hash;
if (_gnutls_mpi_scan_nz (&hash, vdata->data, vdata->size) != 0)
{
gnutls_assert ();
return GNUTLS_E_MPI_SCAN_FAILED;
}
ret = _gnutls_mpi_scan_nz (&tmp[0], signature->data, signature->size);
if (ret < 0)
{
gnutls_assert ();
goto cleanup;
}
ret = _int_rsa_verify (pk_params, hash, tmp[0]);
_gnutls_mpi_release (&tmp[0]);
_gnutls_mpi_release (&hash);
break;
}
default:
gnutls_assert ();
ret = GNUTLS_E_INTERNAL_ERROR;
goto cleanup;
}
cleanup:
return ret;
}
static inline int is_supported_curve(int curve)
{
if (gnutls_ecc_curve_get_name(curve) != NULL)
return 1;
else
return 0;
}
static int
wrap_nettle_pk_generate_params (gnutls_pk_algorithm_t algo,
unsigned int level /*bits */ ,
gnutls_pk_params_st * params)
{
int ret, i;
int q_bits;
memset(params, 0, sizeof(*params));
switch (algo)
{
case GNUTLS_PK_DSA:
{
struct dsa_public_key pub;
struct dsa_private_key priv;
dsa_public_key_init (&pub);
dsa_private_key_init (&priv);
/* the best would be to use _gnutls_pk_bits_to_subgroup_bits()
* but we do NIST DSA here */
if (level <= 1024)
q_bits = 160;
else
q_bits = 256;
ret =
dsa_generate_keypair (&pub, &priv, NULL,
rnd_func, NULL, NULL, level, q_bits);
if (ret != 1)
{
gnutls_assert ();
ret = GNUTLS_E_INTERNAL_ERROR;
goto dsa_fail;
}
params->params_nr = 0;
for (i = 0; i < DSA_PRIVATE_PARAMS; i++)
{
params->params[i] = _gnutls_mpi_alloc_like (&pub.p);
if (params->params[i] == NULL)
{
ret = GNUTLS_E_MEMORY_ERROR;
goto dsa_fail;
}
params->params_nr++;
}
ret = 0;
_gnutls_mpi_set (params->params[0], pub.p);
_gnutls_mpi_set (params->params[1], pub.q);
_gnutls_mpi_set (params->params[2], pub.g);
_gnutls_mpi_set (params->params[3], pub.y);
_gnutls_mpi_set (params->params[4], priv.x);
dsa_fail:
dsa_private_key_clear (&priv);
dsa_public_key_clear (&pub);
if (ret < 0)
goto fail;
break;
}
case GNUTLS_PK_RSA:
{
struct rsa_public_key pub;
struct rsa_private_key priv;
rsa_public_key_init (&pub);
rsa_private_key_init (&priv);
_gnutls_mpi_set_ui (&pub.e, 65537);
ret =
rsa_generate_keypair (&pub, &priv, NULL,
rnd_func, NULL, NULL, level, 0);
if (ret != 1)
{
gnutls_assert ();
ret = GNUTLS_E_INTERNAL_ERROR;
goto rsa_fail;
}
params->params_nr = 0;
for (i = 0; i < RSA_PRIVATE_PARAMS; i++)
{
params->params[i] = _gnutls_mpi_alloc_like (&pub.n);
if (params->params[i] == NULL)
{
ret = GNUTLS_E_MEMORY_ERROR;
goto rsa_fail;
}
params->params_nr++;
}
ret = 0;
_gnutls_mpi_set (params->params[0], pub.n);
_gnutls_mpi_set (params->params[1], pub.e);
_gnutls_mpi_set (params->params[2], priv.d);
_gnutls_mpi_set (params->params[3], priv.p);
_gnutls_mpi_set (params->params[4], priv.q);
_gnutls_mpi_set (params->params[5], priv.c);
_gnutls_mpi_set (params->params[6], priv.a);
_gnutls_mpi_set (params->params[7], priv.b);
rsa_fail:
rsa_private_key_clear (&priv);
rsa_public_key_clear (&pub);
if (ret < 0)
goto fail;
break;
}
case GNUTLS_PK_ECC:
{
ecc_key key;
ecc_set_type tls_ecc_set;
const gnutls_ecc_curve_entry_st *st;
st = _gnutls_ecc_curve_get_params(level);
if (st == NULL)
return gnutls_assert_val(GNUTLS_E_ECC_NO_SUPPORTED_CURVES);
tls_ecc_set.size = st->size;
tls_ecc_set.prime = st->prime;
tls_ecc_set.order = st->order;
tls_ecc_set.Gx = st->Gx;
tls_ecc_set.Gy = st->Gy;
tls_ecc_set.A = st->A;
ret = ecc_make_key(NULL, rnd_func, &key, &tls_ecc_set);
if (ret != 0)
return gnutls_assert_val(GNUTLS_E_INTERNAL_ERROR);
params->params_nr = 0;
for (i = 0; i < ECC_PRIVATE_PARAMS; i++)
{
params->params[i] = _gnutls_mpi_alloc_like(&key.prime);
if (params->params[i] == NULL)
{
ret = GNUTLS_E_MEMORY_ERROR;
goto ecc_fail;
}
params->params_nr++;
}
params->flags = level;
mpz_set(TOMPZ(params->params[0]), key.prime);
mpz_set(TOMPZ(params->params[1]), key.order);
mpz_set(TOMPZ(params->params[2]), key.A);
mpz_set(TOMPZ(params->params[3]), key.Gx);
mpz_set(TOMPZ(params->params[4]), key.Gy);
mpz_set(TOMPZ(params->params[5]), key.pubkey.x);
mpz_set(TOMPZ(params->params[6]), key.pubkey.y);
mpz_set(TOMPZ(params->params[7]), key.k);
ecc_fail:
ecc_free(&key);
if (ret < 0)
goto fail;
break;
}
default:
gnutls_assert ();
return GNUTLS_E_INVALID_REQUEST;
}
return 0;
fail:
for (i = 0; i < params->params_nr; i++)
{
_gnutls_mpi_release (¶ms->params[i]);
}
params->params_nr = 0;
return ret;
}
static int
wrap_nettle_pk_fixup (gnutls_pk_algorithm_t algo,
gnutls_direction_t direction,
gnutls_pk_params_st * params)
{
int result;
if (direction == GNUTLS_IMPORT && algo == GNUTLS_PK_RSA)
{
/* do not trust the generated values. Some old private keys
* generated by us have mess on the values. Those were very
* old but it seemed some of the shipped example private
* keys were as old.
*/
mpz_invert (TOMPZ (params->params[5]),
TOMPZ (params->params[4]), TOMPZ (params->params[3]));
/* calculate exp1 [6] and exp2 [7] */
_gnutls_mpi_release (¶ms->params[6]);
_gnutls_mpi_release (¶ms->params[7]);
result = _gnutls_calc_rsa_exp (params);
if (result < 0)
{
gnutls_assert ();
return result;
}
params->params_nr = RSA_PRIVATE_PARAMS;
}
return 0;
}
int crypto_pk_prio = INT_MAX;
gnutls_crypto_pk_st _gnutls_pk_ops = {
.encrypt = _wrap_nettle_pk_encrypt,
.decrypt = _wrap_nettle_pk_decrypt,
.sign = _wrap_nettle_pk_sign,
.verify = _wrap_nettle_pk_verify,
.generate = wrap_nettle_pk_generate_params,
.pk_fixup_private_params = wrap_nettle_pk_fixup,
.derive = _wrap_nettle_pk_derive,
};
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