static void
ecc_shared_secret(struct ecc_scalar *private_key,
struct ecc_point *public_key, void *out, unsigned size)
{
struct ecc_point r;
mpz_t x;
mpz_init(x);
ecc_point_init(&r, public_key->ecc);
ecc_point_mul(&r, private_key, public_key);
ecc_point_get(&r, x, NULL);
nettle_mpz_get_str_256(size, out, x);
mpz_clear(x);
ecc_point_clear(&r);
return;
}
static int
wrap_nettle_pk_verify_params(gnutls_pk_algorithm_t algo,
const gnutls_pk_params_st * params)
{
int ret;
switch (algo) {
case GNUTLS_PK_RSA:
{
bigint_t t1 = NULL, t2 = NULL;
if (params->params_nr != RSA_PRIVATE_PARAMS)
return
gnutls_assert_val
(GNUTLS_E_INVALID_REQUEST);
t1 = _gnutls_mpi_new(256);
if (t1 == NULL)
return
gnutls_assert_val
(GNUTLS_E_MEMORY_ERROR);
_gnutls_mpi_mulm(t1, params->params[RSA_PRIME1],
params->params[RSA_PRIME2],
params->params[RSA_MODULUS]);
if (_gnutls_mpi_cmp_ui(t1, 0) != 0) {
ret =
gnutls_assert_val
(GNUTLS_E_ILLEGAL_PARAMETER);
goto rsa_cleanup;
}
mpz_invert(TOMPZ(t1),
TOMPZ(params->params[RSA_PRIME2]),
TOMPZ(params->params[RSA_PRIME1]));
if (_gnutls_mpi_cmp(t1, params->params[RSA_COEF])
!= 0) {
ret =
gnutls_assert_val
(GNUTLS_E_ILLEGAL_PARAMETER);
goto rsa_cleanup;
}
/* [RSA_PRIME1] = d % p-1, [RSA_PRIME2] = d % q-1 */
_gnutls_mpi_sub_ui(t1, params->params[RSA_PRIME1],
1);
t2 = _gnutls_mpi_mod(params->params[RSA_PRIV], t1);
if (t2 == NULL) {
ret =
gnutls_assert_val
(GNUTLS_E_MEMORY_ERROR);
goto rsa_cleanup;
}
if (_gnutls_mpi_cmp(params->params[RSA_E1], t2) !=
0) {
ret =
gnutls_assert_val
(GNUTLS_E_ILLEGAL_PARAMETER);
goto rsa_cleanup;
}
_gnutls_mpi_sub_ui(t1, params->params[RSA_PRIME2],
1);
_gnutls_mpi_release(&t2);
t2 = _gnutls_mpi_mod(params->params[RSA_PRIV], t1);
if (t2 == NULL) {
ret =
gnutls_assert_val
(GNUTLS_E_MEMORY_ERROR);
goto rsa_cleanup;
}
if (_gnutls_mpi_cmp(params->params[RSA_E2], t2) !=
0) {
ret =
gnutls_assert_val
(GNUTLS_E_ILLEGAL_PARAMETER);
goto rsa_cleanup;
}
ret = 0;
rsa_cleanup:
_gnutls_mpi_release(&t1);
_gnutls_mpi_release(&t2);
}
break;
case GNUTLS_PK_DSA:
{
bigint_t t1 = NULL;
if (params->params_nr != DSA_PRIVATE_PARAMS)
return
gnutls_assert_val
(GNUTLS_E_INVALID_REQUEST);
t1 = _gnutls_mpi_new(256);
if (t1 == NULL)
return
gnutls_assert_val
(GNUTLS_E_MEMORY_ERROR);
_gnutls_mpi_powm(t1, params->params[DSA_G],
params->params[DSA_X],
params->params[DSA_P]);
if (_gnutls_mpi_cmp(t1, params->params[DSA_Y]) !=
0) {
ret =
gnutls_assert_val
(GNUTLS_E_ILLEGAL_PARAMETER);
goto dsa_cleanup;
}
ret = 0;
dsa_cleanup:
_gnutls_mpi_release(&t1);
}
break;
case GNUTLS_PK_EC:
{
struct ecc_point r, pub;
struct ecc_scalar priv;
mpz_t x1, y1, x2, y2;
const struct ecc_curve *curve;
if (params->params_nr != ECC_PRIVATE_PARAMS)
return
gnutls_assert_val
(GNUTLS_E_INVALID_REQUEST);
curve = get_supported_curve(params->flags);
if (curve == NULL)
return
gnutls_assert_val
(GNUTLS_E_ECC_UNSUPPORTED_CURVE);
ret = _ecc_params_to_pubkey(params, &pub, curve);
if (ret < 0)
return gnutls_assert_val(ret);
ret = _ecc_params_to_privkey(params, &priv, curve);
if (ret < 0) {
ecc_point_clear(&pub);
return gnutls_assert_val(ret);
}
ecc_point_init(&r, curve);
/* verify that x,y lie on the curve */
ret =
ecc_point_set(&r, TOMPZ(params->params[ECC_X]),
TOMPZ(params->params[ECC_Y]));
if (ret == 0) {
ret =
gnutls_assert_val
(GNUTLS_E_ILLEGAL_PARAMETER);
goto ecc_cleanup;
}
ecc_point_clear(&r);
ecc_point_init(&r, curve);
ecc_point_mul_g(&r, &priv);
mpz_init(x1);
mpz_init(y1);
ecc_point_get(&r, x1, y1);
ecc_point_clear(&r);
mpz_init(x2);
mpz_init(y2);
ecc_point_get(&pub, x2, y2);
/* verify that k*(Gx,Gy)=(x,y) */
if (mpz_cmp(x1, x2) != 0 || mpz_cmp(y1, y2) != 0) {
ret =
gnutls_assert_val
(GNUTLS_E_ILLEGAL_PARAMETER);
goto ecc_cleanup;
}
ret = 0;
ecc_cleanup:
ecc_scalar_clear(&priv);
ecc_point_clear(&pub);
}
break;
default:
ret = gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);
}
return ret;
}
static int
wrap_nettle_pk_generate_params(gnutls_pk_algorithm_t algo,
unsigned int level /*bits */ ,
gnutls_pk_params_st * params)
{
int ret;
unsigned int i, 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_EC:
{
struct ecc_scalar key;
struct ecc_point pub;
const struct ecc_curve *curve;
curve = get_supported_curve(level);
if (curve == NULL)
return
gnutls_assert_val
(GNUTLS_E_ECC_UNSUPPORTED_CURVE);
ecc_scalar_init(&key, curve);
ecc_point_init(&pub, curve);
ecdsa_generate_keypair(&pub, &key, NULL, rnd_func);
params->params[ECC_X] = _gnutls_mpi_new(0);
params->params[ECC_Y] = _gnutls_mpi_new(0);
params->params[ECC_K] = _gnutls_mpi_new(0);
if (params->params[ECC_X] == NULL
|| params->params[ECC_Y] == NULL
|| params->params[ECC_K] == NULL) {
_gnutls_mpi_release(¶ms->
params[ECC_X]);
_gnutls_mpi_release(¶ms->
params[ECC_Y]);
_gnutls_mpi_release(¶ms->
params[ECC_K]);
goto ecc_cleanup;
}
params->flags = level;
params->params_nr = ECC_PRIVATE_PARAMS;
ecc_point_get(&pub, TOMPZ(params->params[ECC_X]),
TOMPZ(params->params[ECC_Y]));
ecc_scalar_get(&key, TOMPZ(params->params[ECC_K]));
ecc_cleanup:
ecc_point_clear(&pub);
ecc_scalar_clear(&key);
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;
}
/* To generate a DH key either q must be set in the params or
* level should be set to the number of required bits.
*/
static int
wrap_nettle_pk_generate_keys(gnutls_pk_algorithm_t algo,
unsigned int level /*bits */ ,
gnutls_pk_params_st * params)
{
int ret;
unsigned int i;
switch (algo) {
case GNUTLS_PK_DSA:
#ifdef ENABLE_FIPS140
{
struct dsa_public_key pub;
struct dsa_private_key priv;
if (params->params[DSA_Q] == NULL)
return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);
_dsa_params_to_pubkey(params, &pub);
dsa_private_key_init(&priv);
mpz_init(pub.y);
ret =
dsa_generate_dss_keypair(&pub, &priv,
NULL, rnd_func,
NULL, NULL);
if (ret != 1) {
gnutls_assert();
ret = GNUTLS_E_PK_GENERATION_ERROR;
goto dsa_fail;
}
ret = _gnutls_mpi_init_multi(¶ms->params[DSA_Y], ¶ms->params[DSA_X], NULL);
if (ret < 0) {
gnutls_assert();
goto dsa_fail;
}
mpz_set(TOMPZ(params->params[DSA_Y]), pub.y);
mpz_set(TOMPZ(params->params[DSA_X]), priv.x);
params->params_nr += 2;
dsa_fail:
dsa_private_key_clear(&priv);
mpz_clear(pub.y);
if (ret < 0)
goto fail;
break;
}
#endif
case GNUTLS_PK_DH:
{
struct dsa_public_key pub;
mpz_t r;
mpz_t x, y;
int max_tries;
unsigned have_q = 0;
if (algo != params->algo)
return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);
_dsa_params_to_pubkey(params, &pub);
if (params->params[DSA_Q] != NULL)
have_q = 1;
/* This check is for the case !ENABLE_FIPS140 */
if (algo == GNUTLS_PK_DSA && have_q == 0)
return gnutls_assert_val(GNUTLS_E_INVALID_REQUEST);
mpz_init(r);
mpz_init(x);
mpz_init(y);
max_tries = 3;
do {
if (have_q) {
mpz_set(r, pub.q);
mpz_sub_ui(r, r, 2);
nettle_mpz_random(x, NULL, rnd_func, r);
mpz_add_ui(x, x, 1);
} else {
unsigned size = mpz_sizeinbase(pub.p, 2);
if (level == 0)
level = MIN(size, DH_EXPONENT_SIZE(size));
nettle_mpz_random_size(x, NULL, rnd_func, level);
if (level >= size)
mpz_mod(x, x, pub.p);
}
mpz_powm(y, pub.g, x, pub.p);
max_tries--;
if (max_tries <= 0) {
gnutls_assert();
ret = GNUTLS_E_RANDOM_FAILED;
goto dh_fail;
}
} while(mpz_cmp_ui(y, 1) == 0);
ret = _gnutls_mpi_init_multi(¶ms->params[DSA_Y], ¶ms->params[DSA_X], NULL);
if (ret < 0) {
gnutls_assert();
goto dh_fail;
}
mpz_set(TOMPZ(params->params[DSA_Y]), y);
mpz_set(TOMPZ(params->params[DSA_X]), x);
params->params_nr += 2;
ret = 0;
dh_fail:
mpz_clear(r);
mpz_clear(x);
mpz_clear(y);
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);
mpz_set_ui(pub.e, 65537);
#ifdef ENABLE_FIPS140
ret =
rsa_generate_fips186_4_keypair(&pub, &priv, NULL,
rnd_func, NULL, NULL,
level);
#else
ret =
rsa_generate_keypair(&pub, &priv, NULL,
rnd_func, NULL, NULL,
level, 0);
#endif
if (ret != 1) {
gnutls_assert();
ret = GNUTLS_E_PK_GENERATION_ERROR;
goto rsa_fail;
}
params->params_nr = 0;
for (i = 0; i < RSA_PRIVATE_PARAMS; i++) {
ret = _gnutls_mpi_init(¶ms->params[i]);
if (ret < 0) {
gnutls_assert();
goto rsa_fail;
}
params->params_nr++;
}
mpz_set(TOMPZ(params->params[0]), pub.n);
mpz_set(TOMPZ(params->params[1]), pub.e);
mpz_set(TOMPZ(params->params[2]), priv.d);
mpz_set(TOMPZ(params->params[3]), priv.p);
mpz_set(TOMPZ(params->params[4]), priv.q);
mpz_set(TOMPZ(params->params[5]), priv.c);
mpz_set(TOMPZ(params->params[6]), priv.a);
mpz_set(TOMPZ(params->params[7]), priv.b);
ret = 0;
rsa_fail:
rsa_private_key_clear(&priv);
rsa_public_key_clear(&pub);
if (ret < 0)
goto fail;
break;
}
case GNUTLS_PK_EC:
{
struct ecc_scalar key;
struct ecc_point pub;
const struct ecc_curve *curve;
curve = get_supported_curve(level);
if (curve == NULL)
return
gnutls_assert_val
(GNUTLS_E_ECC_UNSUPPORTED_CURVE);
ecc_scalar_init(&key, curve);
ecc_point_init(&pub, curve);
ecdsa_generate_keypair(&pub, &key, NULL, rnd_func);
ret = _gnutls_mpi_init_multi(¶ms->params[ECC_X], ¶ms->params[ECC_Y],
¶ms->params[ECC_K], NULL);
if (ret < 0) {
gnutls_assert();
goto ecc_fail;
}
params->flags = level;
params->params_nr = ECC_PRIVATE_PARAMS;
ecc_point_get(&pub, TOMPZ(params->params[ECC_X]),
TOMPZ(params->params[ECC_Y]));
ecc_scalar_get(&key, TOMPZ(params->params[ECC_K]));
ret = 0;
ecc_fail:
ecc_point_clear(&pub);
ecc_scalar_clear(&key);
if (ret < 0)
goto fail;
break;
}
default:
gnutls_assert();
return GNUTLS_E_INVALID_REQUEST;
}
FAIL_IF_LIB_ERROR;
return 0;
fail:
for (i = 0; i < params->params_nr; i++) {
_gnutls_mpi_release(¶ms->params[i]);
}
params->params_nr = 0;
FAIL_IF_LIB_ERROR;
return ret;
}
