/**
* gnutls_dh_params_import_raw - import DH parameters
* @dh_params: Is a structure that will hold the prime numbers
* @prime: holds the new prime
* @generator: holds the new generator
*
* This function will replace the pair of prime and generator for use
* in the Diffie-Hellman key exchange. The new parameters should be
* stored in the appropriate gnutls_datum.
*
* Returns: On success, %GNUTLS_E_SUCCESS (zero) is returned,
* otherwise an error code is returned.
**/
int
gnutls_dh_params_import_raw (gnutls_dh_params_t dh_params,
const gnutls_datum_t * prime,
const gnutls_datum_t * generator)
{
bigint_t tmp_prime, tmp_g;
size_t siz;
siz = prime->size;
if (_gnutls_mpi_scan_nz (&tmp_prime, prime->data, siz))
{
gnutls_assert ();
return GNUTLS_E_MPI_SCAN_FAILED;
}
siz = generator->size;
if (_gnutls_mpi_scan_nz (&tmp_g, generator->data, siz))
{
_gnutls_mpi_release (&tmp_prime);
gnutls_assert ();
return GNUTLS_E_MPI_SCAN_FAILED;
}
/* store the generated values
*/
dh_params->params[0] = tmp_prime;
dh_params->params[1] = tmp_g;
return 0;
}
/**
* gnutls_x509_privkey_import_ecc_raw:
* @key: The structure to store the parsed key
* @curve: holds the curve
* @x: holds the x
* @y: holds the y
* @k: holds the k
*
* This function will convert the given elliptic curve parameters to the
* native #gnutls_x509_privkey_t format. The output will be stored
* in @key.
*
* Returns: On success, %GNUTLS_E_SUCCESS (0) is returned, otherwise a
* negative error value.
*
* Since: 3.0
**/
int
gnutls_x509_privkey_import_ecc_raw (gnutls_x509_privkey_t key,
gnutls_ecc_curve_t curve,
const gnutls_datum_t * x,
const gnutls_datum_t * y,
const gnutls_datum_t * k)
{
int ret;
if (key == NULL)
{
gnutls_assert ();
return GNUTLS_E_INVALID_REQUEST;
}
key->params.flags = curve;
ret = _gnutls_ecc_curve_fill_params(curve, &key->params);
if (ret < 0)
return gnutls_assert_val(ret);
if (_gnutls_mpi_scan_nz (&key->params.params[ECC_X], x->data, x->size))
{
gnutls_assert ();
ret = GNUTLS_E_MPI_SCAN_FAILED;
goto cleanup;
}
key->params.params_nr++;
if (_gnutls_mpi_scan_nz (&key->params.params[ECC_Y], y->data, y->size))
{
gnutls_assert ();
ret = GNUTLS_E_MPI_SCAN_FAILED;
goto cleanup;
}
key->params.params_nr++;
if (_gnutls_mpi_scan_nz (&key->params.params[ECC_K], k->data, k->size))
{
gnutls_assert ();
ret = GNUTLS_E_MPI_SCAN_FAILED;
goto cleanup;
}
key->params.params_nr++;
key->pk_algorithm = GNUTLS_PK_EC;
return 0;
cleanup:
gnutls_pk_params_release(&key->params);
return ret;
}
static int read_rs(bigint_t *r, bigint_t *s, uint8_t *data, size_t data_size)
{
unsigned int dhalf = data_size/2;
if (_gnutls_mpi_scan_nz (r, data, dhalf) != 0)
return gnutls_assert_val(GNUTLS_E_MPI_SCAN_FAILED);
if (_gnutls_mpi_scan_nz (s, &data[dhalf], dhalf) != 0)
{
_gnutls_mpi_release(r);
return gnutls_assert_val(GNUTLS_E_MPI_SCAN_FAILED);
}
return 0;
}
/**
* gnutls_srp_verifier - Used to calculate an SRP verifier
* @username: is the user's name
* @password: is the user's password
* @salt: should be some randomly generated bytes
* @generator: is the generator of the group
* @prime: is the group's prime
* @res: where the verifier will be stored.
*
* This function will create an SRP verifier, as specified in RFC2945.
* The @prime and @generator should be one of the static parameters defined
* in gnutls/extra.h or may be generated using the GCRYPT functions
* gcry_prime_generate() and gcry_prime_group_generator().
* The verifier will be allocated with @malloc and will be stored in @res using
* binary format.
*
**/
int
gnutls_srp_verifier (const char *username, const char *password,
const gnutls_datum_t * salt,
const gnutls_datum_t * generator,
const gnutls_datum_t * prime, gnutls_datum_t * res)
{
mpi_t _n, _g;
int ret;
size_t digest_size = 20, size;
opaque digest[20];
ret = _gnutls_calc_srp_sha (username, password, salt->data,
salt->size, &digest_size, digest);
if (ret < 0)
{
gnutls_assert ();
return ret;
}
size = prime->size;
if (_gnutls_mpi_scan_nz (&_n, prime->data, &size))
{
gnutls_assert ();
return GNUTLS_E_MPI_SCAN_FAILED;
}
size = generator->size;
if (_gnutls_mpi_scan_nz (&_g, generator->data, &size))
{
gnutls_assert ();
return GNUTLS_E_MPI_SCAN_FAILED;
}
ret = _gnutls_srp_gx (digest, 20, &res->data, _g, _n, malloc);
if (ret < 0)
{
gnutls_assert ();
return ret;
}
res->size = ret;
return 0;
}
/* This calculates the SHA1(A | B)
* A and B will be left-padded with zeros to fill n_size.
*/
mpi_t
_gnutls_calc_srp_u (mpi_t A, mpi_t B, mpi_t n)
{
size_t b_size, a_size;
opaque *holder, hd[MAX_HASH_SIZE];
size_t holder_size, hash_size, n_size;
GNUTLS_HASH_HANDLE td;
int ret;
mpi_t res;
/* get the size of n in bytes */
_gnutls_mpi_print (NULL, &n_size, n);
_gnutls_mpi_print (NULL, &a_size, A);
_gnutls_mpi_print (NULL, &b_size, B);
if (a_size > n_size || b_size > n_size)
{
gnutls_assert ();
return NULL; /* internal error */
}
holder_size = n_size + n_size;
holder = gnutls_calloc (1, holder_size);
if (holder == NULL)
return NULL;
_gnutls_mpi_print (&holder[n_size - a_size], &a_size, A);
_gnutls_mpi_print (&holder[n_size + n_size - b_size], &b_size, B);
td = _gnutls_hash_init (GNUTLS_MAC_SHA1);
if (td == NULL)
{
gnutls_free (holder);
gnutls_assert ();
return NULL;
}
_gnutls_hash (td, holder, holder_size);
_gnutls_hash_deinit (td, hd);
/* convert the bytes of hd to integer
*/
hash_size = 20; /* SHA */
ret = _gnutls_mpi_scan_nz (&res, hd, &hash_size);
gnutls_free (holder);
if (ret < 0)
{
gnutls_assert ();
return NULL;
}
return res;
}
int
_gnutls_srp_gx (opaque * text, size_t textsize, opaque ** result,
bigint_t g, bigint_t prime, gnutls_alloc_function galloc_func)
{
bigint_t x, e;
size_t result_size;
int ret;
if (_gnutls_mpi_scan_nz (&x, text, textsize))
{
gnutls_assert ();
return GNUTLS_E_MPI_SCAN_FAILED;
}
e = _gnutls_mpi_alloc_like (prime);
if (e == NULL)
{
gnutls_assert ();
_gnutls_mpi_release (&x);
return GNUTLS_E_MEMORY_ERROR;
}
/* e = g^x mod prime (n) */
_gnutls_mpi_powm (e, g, x, prime);
_gnutls_mpi_release (&x);
ret = _gnutls_mpi_print (e, NULL, &result_size);
if (ret == GNUTLS_E_SHORT_MEMORY_BUFFER)
{
*result = galloc_func (result_size);
if ((*result) == NULL)
return GNUTLS_E_MEMORY_ERROR;
_gnutls_mpi_print (e, *result, &result_size);
ret = result_size;
}
else
{
gnutls_assert ();
ret = GNUTLS_E_MPI_PRINT_FAILED;
}
_gnutls_mpi_release (&e);
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;
}
/* params is p, q, g, y in that order
*/
int
_gnutls_dsa_verify (const gnutls_datum_t * vdata,
const gnutls_datum_t * sig_value, mpi_t * params,
int params_len)
{
mpi_t mdata;
int ret;
size_t k;
mpi_t rs[2];
if (vdata->size != 20)
{ /* sha-1 only */
gnutls_assert ();
return GNUTLS_E_PK_SIG_VERIFY_FAILED;
}
if (decode_ber_rs (sig_value, &rs[0], &rs[1]) != 0)
{
gnutls_assert ();
return GNUTLS_E_MPI_SCAN_FAILED;
}
k = vdata->size;
if (_gnutls_mpi_scan_nz (&mdata, vdata->data, &k) != 0)
{
gnutls_assert ();
_gnutls_mpi_release (&rs[0]);
_gnutls_mpi_release (&rs[1]);
return GNUTLS_E_MPI_SCAN_FAILED;
}
/* decrypt signature */
ret = _gnutls_pk_verify (GCRY_PK_DSA, mdata, rs, params, params_len);
_gnutls_mpi_release (&mdata);
_gnutls_mpi_release (&rs[0]);
_gnutls_mpi_release (&rs[1]);
if (ret < 0)
{
gnutls_assert ();
return ret;
}
return 0; /* ok */
}
/* Do DSA signature calculation. params is p, q, g, y, x in that order.
*/
int
_gnutls_dsa_sign (gnutls_datum_t * signature,
const gnutls_datum_t * hash, mpi_t * params,
unsigned params_len)
{
mpi_t rs[2], mdata;
int ret;
size_t k;
k = hash->size;
if (k != 20)
{ /* SHA only */
gnutls_assert ();
return GNUTLS_E_PK_SIGN_FAILED;
}
if (_gnutls_mpi_scan_nz (&mdata, hash->data, &k) != 0)
{
gnutls_assert ();
return GNUTLS_E_MPI_SCAN_FAILED;
}
ret = _gnutls_pk_sign (GCRY_PK_DSA, rs, mdata, params, params_len);
/* rs[0], rs[1] now hold r,s */
_gnutls_mpi_release (&mdata);
if (ret < 0)
{
gnutls_assert ();
return ret;
}
ret = encode_ber_rs (signature, rs[0], rs[1]);
/* free r,s */
_gnutls_mpi_release (&rs[0]);
_gnutls_mpi_release (&rs[1]);
if (ret != 0)
{
gnutls_assert ();
return GNUTLS_E_MEMORY_ERROR;
}
return 0;
}
int
_gnutls_srp_gx (opaque * text, size_t textsize, opaque ** result,
mpi_t g, mpi_t prime, gnutls_alloc_function galloc_func)
{
mpi_t x, e;
size_t result_size;
if (_gnutls_mpi_scan_nz (&x, text, &textsize))
{
gnutls_assert ();
return GNUTLS_E_MPI_SCAN_FAILED;
}
e = _gnutls_mpi_alloc_like (prime);
if (e == NULL)
{
gnutls_assert ();
_gnutls_mpi_release (&x);
return GNUTLS_E_MEMORY_ERROR;
}
/* e = g^x mod prime (n) */
_gnutls_mpi_powm (e, g, x, prime);
_gnutls_mpi_release (&x);
_gnutls_mpi_print (NULL, &result_size, e);
if (result != NULL)
{
*result = galloc_func (result_size);
if ((*result) == NULL)
return GNUTLS_E_MEMORY_ERROR;
_gnutls_mpi_print (*result, &result_size, e);
}
_gnutls_mpi_release (&e);
return result_size;
}
/* receive the key exchange message ( n, g, s, B)
*/
int
_gnutls_proc_srp_server_kx (gnutls_session_t session, opaque * data,
size_t _data_size)
{
uint8_t n_s;
uint16_t n_g, n_n, n_b;
size_t _n_s, _n_g, _n_n, _n_b;
const uint8_t *data_n;
const uint8_t *data_g;
const uint8_t *data_s;
const uint8_t *data_b;
int i, ret;
opaque hd[SRP_MAX_HASH_SIZE];
char *username, *password;
ssize_t data_size = _data_size;
gnutls_srp_client_credentials_t cred;
cred = (gnutls_srp_client_credentials_t)
_gnutls_get_cred (session->key, GNUTLS_CRD_SRP, NULL);
if (cred == NULL)
{
gnutls_assert ();
return GNUTLS_E_INSUFFICIENT_CREDENTIALS;
}
if (session->internals.srp_username == NULL)
{
username = cred->username;
password = cred->password;
}
else
{
username = session->internals.srp_username;
password = session->internals.srp_password;
}
if (username == NULL || password == NULL)
{
gnutls_assert ();
return GNUTLS_E_INSUFFICIENT_CREDENTIALS;
}
i = 0;
/* Read N
*/
DECR_LEN (data_size, 2);
n_n = _gnutls_read_uint16 (&data[i]);
i += 2;
DECR_LEN (data_size, n_n);
data_n = &data[i];
i += n_n;
/* Read G
*/
DECR_LEN (data_size, 2);
n_g = _gnutls_read_uint16 (&data[i]);
i += 2;
DECR_LEN (data_size, n_g);
data_g = &data[i];
i += n_g;
/* Read salt
*/
DECR_LEN (data_size, 1);
n_s = data[i];
i += 1;
DECR_LEN (data_size, n_s);
data_s = &data[i];
i += n_s;
/* Read B
*/
DECR_LEN (data_size, 2);
n_b = _gnutls_read_uint16 (&data[i]);
i += 2;
DECR_LEN (data_size, n_b);
data_b = &data[i];
i += n_b;
_n_s = n_s;
_n_g = n_g;
_n_n = n_n;
_n_b = n_b;
if (_gnutls_mpi_scan_nz (&N, data_n, &_n_n) != 0)
{
gnutls_assert ();
return GNUTLS_E_MPI_SCAN_FAILED;
}
if (_gnutls_mpi_scan_nz (&G, data_g, &_n_g) != 0)
{
gnutls_assert ();
return GNUTLS_E_MPI_SCAN_FAILED;
}
if (_gnutls_mpi_scan_nz (&B, data_b, &_n_b) != 0)
{
gnutls_assert ();
return GNUTLS_E_MPI_SCAN_FAILED;
}
/* Check if the g and n are from the SRP
* draft. Otherwise check if N is a prime and G
* a generator.
*/
if ((ret = check_g_n (data_g, _n_g, data_n, _n_n)) < 0)
{
_gnutls_x509_log ("Checking the SRP group parameters.\n");
if ((ret = group_check_g_n (G, N)) < 0)
{
gnutls_assert ();
return ret;
}
}
/* Checks if b % n == 0
*/
if ((ret = check_b_mod_n (B, N)) < 0)
{
gnutls_assert ();
return ret;
}
/* generate x = SHA(s | SHA(U | ":" | p))
* (or the equivalent using bcrypt)
*/
if ((ret =
_gnutls_calc_srp_x (username, password, (opaque *) data_s, n_s,
&_n_g, hd)) < 0)
{
gnutls_assert ();
return ret;
}
if (_gnutls_mpi_scan_nz (&session->key->x, hd, &_n_g) != 0)
{
gnutls_assert ();
return GNUTLS_E_MPI_SCAN_FAILED;
}
return i; /* return the processed data
* needed in auth_srp_rsa.
*/
}
/**
* gnutls_x509_privkey_import_dsa_raw - This function will import a raw DSA key
* @key: The structure to store the parsed key
* @p: holds the p
* @q: holds the q
* @g: holds the g
* @y: holds the y
* @x: holds the x
*
* This function will convert the given DSA raw parameters
* to the native gnutls_x509_privkey_t format. The output will be stored in @key.
*
**/
int
gnutls_x509_privkey_import_dsa_raw (gnutls_x509_privkey_t key,
const gnutls_datum_t * p,
const gnutls_datum_t * q,
const gnutls_datum_t * g,
const gnutls_datum_t * y,
const gnutls_datum_t * x)
{
int i = 0, ret;
size_t siz = 0;
if (key == NULL)
{
gnutls_assert ();
return GNUTLS_E_INVALID_REQUEST;
}
siz = p->size;
if (_gnutls_mpi_scan_nz (&key->params[0], p->data, &siz))
{
gnutls_assert ();
FREE_DSA_PRIVATE_PARAMS;
return GNUTLS_E_MPI_SCAN_FAILED;
}
siz = q->size;
if (_gnutls_mpi_scan_nz (&key->params[1], q->data, &siz))
{
gnutls_assert ();
FREE_DSA_PRIVATE_PARAMS;
return GNUTLS_E_MPI_SCAN_FAILED;
}
siz = g->size;
if (_gnutls_mpi_scan_nz (&key->params[2], g->data, &siz))
{
gnutls_assert ();
FREE_DSA_PRIVATE_PARAMS;
return GNUTLS_E_MPI_SCAN_FAILED;
}
siz = y->size;
if (_gnutls_mpi_scan_nz (&key->params[3], y->data, &siz))
{
gnutls_assert ();
FREE_DSA_PRIVATE_PARAMS;
return GNUTLS_E_MPI_SCAN_FAILED;
}
siz = x->size;
if (_gnutls_mpi_scan_nz (&key->params[4], x->data, &siz))
{
gnutls_assert ();
FREE_DSA_PRIVATE_PARAMS;
return GNUTLS_E_MPI_SCAN_FAILED;
}
if (!key->crippled)
{
ret = _encode_dsa (&key->key, key->params);
if (ret < 0)
{
gnutls_assert ();
FREE_DSA_PRIVATE_PARAMS;
return ret;
}
}
key->params_size = DSA_PRIVATE_PARAMS;
key->pk_algorithm = GNUTLS_PK_DSA;
return 0;
}
/* Do PKCS-1 RSA decryption.
* params is modulus, public exp., private key
* Can decrypt block type 1 and type 2 packets.
*/
int
_gnutls_pkcs1_rsa_decrypt (gnutls_datum_t * plaintext,
const gnutls_datum_t * ciphertext,
mpi_t * params, unsigned params_len,
unsigned btype)
{
unsigned k, i;
int ret;
mpi_t c, res;
opaque *edata;
size_t esize, mod_bits;
mod_bits = _gnutls_mpi_get_nbits (params[0]);
k = mod_bits / 8;
if (mod_bits % 8 != 0)
k++;
esize = ciphertext->size;
if (esize != k)
{
gnutls_assert ();
return GNUTLS_E_PK_DECRYPTION_FAILED;
}
if (_gnutls_mpi_scan_nz (&c, ciphertext->data, &esize) != 0)
{
gnutls_assert ();
return GNUTLS_E_MPI_SCAN_FAILED;
}
/* we can use btype to see if the private key is
* available.
*/
if (btype == 2)
ret = _gnutls_pk_decrypt (GCRY_PK_RSA, &res, c, params, params_len);
else
{
ret = _gnutls_pk_encrypt (GCRY_PK_RSA, &res, c, params, params_len);
}
_gnutls_mpi_release (&c);
if (ret < 0)
{
gnutls_assert ();
return ret;
}
_gnutls_mpi_print (NULL, &esize, res);
edata = gnutls_alloca (esize + 1);
if (edata == NULL)
{
gnutls_assert ();
_gnutls_mpi_release (&res);
return GNUTLS_E_MEMORY_ERROR;
}
_gnutls_mpi_print (&edata[1], &esize, res);
_gnutls_mpi_release (&res);
/* EB = 00||BT||PS||00||D
* (use block type 'btype')
*
* From now on, return GNUTLS_E_DECRYPTION_FAILED on errors, to
* avoid attacks similar to the one described by Bleichenbacher in:
* "Chosen Ciphertext Attacks against Protocols Based on RSA
* Encryption Standard PKCS #1".
*/
edata[0] = 0;
esize++;
if (edata[0] != 0 || edata[1] != btype)
{
gnutls_assert ();
gnutls_afree (edata);
return GNUTLS_E_DECRYPTION_FAILED;
}
ret = GNUTLS_E_DECRYPTION_FAILED;
switch (btype)
{
case 2:
for (i = 2; i < esize; i++)
{
if (edata[i] == 0)
{
ret = 0;
break;
}
}
break;
case 1:
for (i = 2; i < esize; i++)
{
if (edata[i] == 0 && i > 2)
{
ret = 0;
break;
}
if (edata[i] != 0xff)
{
_gnutls_handshake_log ("PKCS #1 padding error");
/* PKCS #1 padding error. Don't use
GNUTLS_E_PKCS1_WRONG_PAD here. */
break;
}
}
break;
default:
gnutls_assert ();
gnutls_afree (edata);
break;
}
i++;
if (ret < 0)
{
gnutls_assert ();
gnutls_afree (edata);
return GNUTLS_E_DECRYPTION_FAILED;
}
if (_gnutls_sset_datum (plaintext, &edata[i], esize - i) < 0)
{
gnutls_assert ();
gnutls_afree (edata);
return GNUTLS_E_MEMORY_ERROR;
}
gnutls_afree (edata);
return 0;
}
/**
* gnutls_x509_privkey_import_rsa_raw2:
* @key: The structure to store the parsed key
* @m: holds the modulus
* @e: holds the public exponent
* @d: holds the private exponent
* @p: holds the first prime (p)
* @q: holds the second prime (q)
* @u: holds the coefficient
*
* This function will convert the given RSA raw parameters to the
* native #gnutls_x509_privkey_t format. The output will be stored in
* @key.
*
* Returns: On success, %GNUTLS_E_SUCCESS is returned, otherwise a
* negative error value.
**/
int
gnutls_x509_privkey_import_rsa_raw2 (gnutls_x509_privkey_t key,
const gnutls_datum_t * m,
const gnutls_datum_t * e,
const gnutls_datum_t * d,
const gnutls_datum_t * p,
const gnutls_datum_t * q,
const gnutls_datum_t * u,
const gnutls_datum_t * e1,
const gnutls_datum_t * e2)
{
int i = 0, ret;
size_t siz = 0;
gnutls_pk_params_st pk_params;
memset (&pk_params, 0, sizeof (pk_params));
if (key == NULL)
{
gnutls_assert ();
return GNUTLS_E_INVALID_REQUEST;
}
key->params_size = 0;
siz = m->size;
if (_gnutls_mpi_scan_nz (&key->params[0], m->data, siz))
{
gnutls_assert ();
FREE_RSA_PRIVATE_PARAMS;
return GNUTLS_E_MPI_SCAN_FAILED;
}
key->params_size++;
siz = e->size;
if (_gnutls_mpi_scan_nz (&key->params[1], e->data, siz))
{
gnutls_assert ();
FREE_RSA_PRIVATE_PARAMS;
return GNUTLS_E_MPI_SCAN_FAILED;
}
key->params_size++;
siz = d->size;
if (_gnutls_mpi_scan_nz (&key->params[2], d->data, siz))
{
gnutls_assert ();
FREE_RSA_PRIVATE_PARAMS;
return GNUTLS_E_MPI_SCAN_FAILED;
}
key->params_size++;
siz = p->size;
if (_gnutls_mpi_scan_nz (&key->params[3], p->data, siz))
{
gnutls_assert ();
FREE_RSA_PRIVATE_PARAMS;
return GNUTLS_E_MPI_SCAN_FAILED;
}
key->params_size++;
siz = q->size;
if (_gnutls_mpi_scan_nz (&key->params[4], q->data, siz))
{
gnutls_assert ();
FREE_RSA_PRIVATE_PARAMS;
return GNUTLS_E_MPI_SCAN_FAILED;
}
key->params_size++;
siz = u->size;
if (_gnutls_mpi_scan_nz (&key->params[5], u->data, siz))
{
gnutls_assert ();
FREE_RSA_PRIVATE_PARAMS;
return GNUTLS_E_MPI_SCAN_FAILED;
}
key->params_size++;
if (e1 && e2)
{
siz = e1->size;
if (_gnutls_mpi_scan_nz (&key->params[6], e1->data, siz))
{
gnutls_assert ();
FREE_RSA_PRIVATE_PARAMS;
return GNUTLS_E_MPI_SCAN_FAILED;
}
key->params_size++;
siz = e2->size;
if (_gnutls_mpi_scan_nz (&key->params[7], e2->data, siz))
{
gnutls_assert ();
FREE_RSA_PRIVATE_PARAMS;
return GNUTLS_E_MPI_SCAN_FAILED;
}
key->params_size++;
}
for (i = 0; i < key->params_size; i++)
{
pk_params.params[i] = key->params[i];
}
pk_params.params_nr = key->params_size;
ret = _gnutls_pk_fixup (GNUTLS_PK_RSA, GNUTLS_IMPORT, &pk_params);
if (ret < 0)
{
gnutls_assert ();
FREE_RSA_PRIVATE_PARAMS;
return ret;
}
for (i = 0; i < pk_params.params_nr; i++)
{
key->params[i] = pk_params.params[i];
}
key->params_size = pk_params.params_nr;
if (!key->crippled)
{
ret = _gnutls_asn1_encode_rsa (&key->key, key->params);
if (ret < 0)
{
gnutls_assert ();
FREE_RSA_PRIVATE_PARAMS;
return ret;
}
}
key->params_size = RSA_PRIVATE_PARAMS;
key->pk_algorithm = GNUTLS_PK_RSA;
return 0;
}
/**
* gnutls_x509_privkey_import_rsa_raw - This function will import a raw RSA key
* @key: The structure to store the parsed key
* @m: holds the modulus
* @e: holds the public exponent
* @d: holds the private exponent
* @p: holds the first prime (p)
* @q: holds the second prime (q)
* @u: holds the coefficient
*
* This function will convert the given RSA raw parameters
* to the native gnutls_x509_privkey_t format. The output will be stored in @key.
*
**/
int
gnutls_x509_privkey_import_rsa_raw (gnutls_x509_privkey_t key,
const gnutls_datum_t * m,
const gnutls_datum_t * e,
const gnutls_datum_t * d,
const gnutls_datum_t * p,
const gnutls_datum_t * q,
const gnutls_datum_t * u)
{
int i = 0, ret;
size_t siz = 0;
if (key == NULL)
{
gnutls_assert ();
return GNUTLS_E_INVALID_REQUEST;
}
siz = m->size;
if (_gnutls_mpi_scan_nz (&key->params[0], m->data, &siz))
{
gnutls_assert ();
FREE_RSA_PRIVATE_PARAMS;
return GNUTLS_E_MPI_SCAN_FAILED;
}
siz = e->size;
if (_gnutls_mpi_scan_nz (&key->params[1], e->data, &siz))
{
gnutls_assert ();
FREE_RSA_PRIVATE_PARAMS;
return GNUTLS_E_MPI_SCAN_FAILED;
}
siz = d->size;
if (_gnutls_mpi_scan_nz (&key->params[2], d->data, &siz))
{
gnutls_assert ();
FREE_RSA_PRIVATE_PARAMS;
return GNUTLS_E_MPI_SCAN_FAILED;
}
siz = p->size;
if (_gnutls_mpi_scan_nz (&key->params[3], p->data, &siz))
{
gnutls_assert ();
FREE_RSA_PRIVATE_PARAMS;
return GNUTLS_E_MPI_SCAN_FAILED;
}
siz = q->size;
if (_gnutls_mpi_scan_nz (&key->params[4], q->data, &siz))
{
gnutls_assert ();
FREE_RSA_PRIVATE_PARAMS;
return GNUTLS_E_MPI_SCAN_FAILED;
}
#ifdef CALC_COEFF
key->params[5] = _gnutls_mpi_snew (_gnutls_mpi_get_nbits (key->params[0]));
if (key->params[5] == NULL)
{
gnutls_assert ();
FREE_RSA_PRIVATE_PARAMS;
return GNUTLS_E_MEMORY_ERROR;
}
_gnutls_mpi_invm (key->params[5], key->params[3], key->params[4]);
#else
siz = u->size;
if (_gnutls_mpi_scan_nz (&key->params[5], u->data, &siz))
{
gnutls_assert ();
FREE_RSA_PRIVATE_PARAMS;
return GNUTLS_E_MPI_SCAN_FAILED;
}
#endif
if (!key->crippled)
{
ret = _encode_rsa (&key->key, key->params);
if (ret < 0)
{
gnutls_assert ();
FREE_RSA_PRIVATE_PARAMS;
return ret;
}
}
key->params_size = RSA_PRIVATE_PARAMS;
key->pk_algorithm = GNUTLS_PK_RSA;
return 0;
}
static int
_wrap_gcry_pk_verify (gnutls_pk_algorithm_t algo,
const gnutls_datum_t * vdata,
const gnutls_datum_t * signature,
const gnutls_pk_params_st * pk_params)
{
gcry_sexp_t s_sig = NULL, s_hash = NULL, s_pkey = NULL;
int rc = -1, ret;
bigint_t hash;
bigint_t tmp[2] = { NULL, NULL };
if (_gnutls_mpi_scan_nz (&hash, vdata->data, vdata->size) != 0)
{
gnutls_assert ();
return GNUTLS_E_MPI_SCAN_FAILED;
}
/* make a sexp from pkey */
switch (algo)
{
case GNUTLS_PK_DSA:
if (pk_params->params_nr >= 4)
rc = gcry_sexp_build (&s_pkey, NULL,
"(public-key(dsa(p%m)(q%m)(g%m)(y%m)))",
pk_params->params[0], pk_params->params[1],
pk_params->params[2], pk_params->params[3]);
break;
case GNUTLS_PK_RSA:
if (pk_params->params_nr >= 2)
rc = gcry_sexp_build (&s_pkey, NULL,
"(public-key(rsa(n%m)(e%m)))",
pk_params->params[0], pk_params->params[1]);
break;
default:
gnutls_assert ();
ret = GNUTLS_E_INTERNAL_ERROR;
goto cleanup;
}
if (rc != 0)
{
gnutls_assert ();
ret = GNUTLS_E_INTERNAL_ERROR;
goto cleanup;
}
/* put the data into a simple list */
if (gcry_sexp_build (&s_hash, NULL, "%m", hash))
{
gnutls_assert ();
ret = GNUTLS_E_INTERNAL_ERROR;
goto cleanup;
}
switch (algo)
{
case GNUTLS_PK_DSA:
ret = _gnutls_decode_ber_rs (signature, &tmp[0], &tmp[1]);
if (ret < 0)
{
gnutls_assert ();
goto cleanup;
}
rc = gcry_sexp_build (&s_sig, NULL,
"(sig-val(dsa(r%m)(s%m)))", tmp[0], tmp[1]);
_gnutls_mpi_release (&tmp[0]);
_gnutls_mpi_release (&tmp[1]);
break;
case GNUTLS_PK_RSA:
ret = _gnutls_mpi_scan_nz (&tmp[0], signature->data, signature->size);
if (ret < 0)
{
gnutls_assert ();
goto cleanup;
}
rc = gcry_sexp_build (&s_sig, NULL, "(sig-val(rsa(s%m)))", tmp[0]);
_gnutls_mpi_release (&tmp[0]);
break;
default:
gnutls_assert ();
ret = GNUTLS_E_INTERNAL_ERROR;
goto cleanup;
}
if (rc != 0)
{
gnutls_assert ();
ret = GNUTLS_E_INTERNAL_ERROR;
goto cleanup;
}
rc = gcry_pk_verify (s_sig, s_hash, s_pkey);
if (rc != 0)
{
gnutls_assert ();
ret = GNUTLS_E_PK_SIG_VERIFY_FAILED;
goto cleanup;
}
ret = 0;
cleanup:
_gnutls_mpi_release (&hash);
if (s_sig)
gcry_sexp_release (s_sig);
if (s_hash)
gcry_sexp_release (s_hash);
if (s_pkey)
gcry_sexp_release (s_pkey);
return ret;
}
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;
unsigned int hash_len;
bigint_t tmp[2] = { NULL, NULL };
switch (algo)
{
case GNUTLS_PK_EC: /* 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));
_gnutls_dsa_q_to_hash (algo, pk_params, &hash_len);
if (hash_len > vdata->size)
hash_len = vdata->size;
ret = ecc_verify_hash(&sig, vdata->data, hash_len, &stat, &pub);
if (ret != 0 || stat != 1)
{
gnutls_assert();
ret = GNUTLS_E_PK_SIG_VERIFY_FAILED;
}
else
ret = 0;
_gnutls_mpi_release (&tmp[0]);
_gnutls_mpi_release (&tmp[1]);
_ecc_params_clear( &pub);
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));
_gnutls_dsa_q_to_hash (algo, pk_params, &hash_len);
if (hash_len > vdata->size)
hash_len = vdata->size;
ret = _dsa_verify (&pub, hash_len, vdata->data, &sig);
if (ret == 0)
{
gnutls_assert();
ret = GNUTLS_E_PK_SIG_VERIFY_FAILED;
}
else
ret = 0;
_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;
}
/* Do PKCS-1 RSA encryption.
* params is modulus, public exp.
*/
int
_gnutls_pkcs1_rsa_encrypt (gnutls_datum_t * ciphertext,
const gnutls_datum_t * plaintext,
mpi_t * params, unsigned params_len,
unsigned btype)
{
unsigned int i, pad;
int ret;
mpi_t m, res;
opaque *edata, *ps;
size_t k, psize;
size_t mod_bits;
mod_bits = _gnutls_mpi_get_nbits (params[0]);
k = mod_bits / 8;
if (mod_bits % 8 != 0)
k++;
if (plaintext->size > k - 11)
{
gnutls_assert ();
return GNUTLS_E_PK_ENCRYPTION_FAILED;
}
edata = gnutls_alloca (k);
if (edata == NULL)
{
gnutls_assert ();
return GNUTLS_E_MEMORY_ERROR;
}
/* EB = 00||BT||PS||00||D
* (use block type 'btype')
*/
edata[0] = 0;
edata[1] = btype;
psize = k - 3 - plaintext->size;
ps = &edata[2];
switch (btype)
{
case 2:
/* using public key */
if (params_len < RSA_PUBLIC_PARAMS)
{
gnutls_assert ();
gnutls_afree (edata);
return GNUTLS_E_INTERNAL_ERROR;
}
if (gc_pseudo_random (ps, psize) != GC_OK)
{
gnutls_assert ();
gnutls_afree (edata);
return GNUTLS_E_RANDOM_FAILED;
}
for (i = 0; i < psize; i++)
while (ps[i] == 0)
{
if (gc_pseudo_random (&ps[i], 1) != GC_OK)
{
gnutls_assert ();
gnutls_afree (edata);
return GNUTLS_E_RANDOM_FAILED;
}
}
break;
case 1:
/* using private key */
if (params_len < RSA_PRIVATE_PARAMS)
{
gnutls_assert ();
gnutls_afree (edata);
return GNUTLS_E_INTERNAL_ERROR;
}
for (i = 0; i < psize; i++)
ps[i] = 0xff;
break;
default:
gnutls_assert ();
gnutls_afree (edata);
return GNUTLS_E_INTERNAL_ERROR;
}
ps[psize] = 0;
memcpy (&ps[psize + 1], plaintext->data, plaintext->size);
if (_gnutls_mpi_scan_nz (&m, edata, &k) != 0)
{
gnutls_assert ();
gnutls_afree (edata);
return GNUTLS_E_MPI_SCAN_FAILED;
}
gnutls_afree (edata);
if (btype == 2) /* encrypt */
ret = _gnutls_pk_encrypt (GCRY_PK_RSA, &res, m, params, params_len);
else /* sign */
ret = _gnutls_pk_sign (GCRY_PK_RSA, &res, m, params, params_len);
_gnutls_mpi_release (&m);
if (ret < 0)
{
gnutls_assert ();
return ret;
}
_gnutls_mpi_print (NULL, &psize, res);
if (psize < k)
{
/* padding psize */
pad = k - psize;
psize = k;
}
else if (psize == k)
{
pad = 0;
}
else
{ /* psize > k !!! */
/* This is an impossible situation */
gnutls_assert ();
_gnutls_mpi_release (&res);
return GNUTLS_E_INTERNAL_ERROR;
}
ciphertext->data = gnutls_malloc (psize);
if (ciphertext->data == NULL)
{
gnutls_assert ();
_gnutls_mpi_release (&res);
return GNUTLS_E_MEMORY_ERROR;
}
_gnutls_mpi_print (&ciphertext->data[pad], &psize, res);
for (i = 0; i < pad; i++)
ciphertext->data[i] = 0;
ciphertext->size = k;
_gnutls_mpi_release (&res);
return 0;
}
/**
* gnutls_x509_privkey_import_dsa_raw:
* @key: The structure to store the parsed key
* @p: holds the p
* @q: holds the q
* @g: holds the g
* @y: holds the y
* @x: holds the x
*
* This function will convert the given DSA raw parameters to the
* native #gnutls_x509_privkey_t format. The output will be stored
* in @key.
*
* Returns: On success, %GNUTLS_E_SUCCESS (0) is returned, otherwise a
* negative error value.
**/
int
gnutls_x509_privkey_import_dsa_raw (gnutls_x509_privkey_t key,
const gnutls_datum_t * p,
const gnutls_datum_t * q,
const gnutls_datum_t * g,
const gnutls_datum_t * y,
const gnutls_datum_t * x)
{
int ret;
size_t siz = 0;
if (key == NULL)
{
gnutls_assert ();
return GNUTLS_E_INVALID_REQUEST;
}
siz = p->size;
if (_gnutls_mpi_scan_nz (&key->params.params[0], p->data, siz))
{
gnutls_assert ();
ret = GNUTLS_E_MPI_SCAN_FAILED;
goto cleanup;
}
siz = q->size;
if (_gnutls_mpi_scan_nz (&key->params.params[1], q->data, siz))
{
gnutls_assert ();
ret = GNUTLS_E_MPI_SCAN_FAILED;
goto cleanup;
}
siz = g->size;
if (_gnutls_mpi_scan_nz (&key->params.params[2], g->data, siz))
{
gnutls_assert ();
ret = GNUTLS_E_MPI_SCAN_FAILED;
goto cleanup;
}
siz = y->size;
if (_gnutls_mpi_scan_nz (&key->params.params[3], y->data, siz))
{
gnutls_assert ();
ret = GNUTLS_E_MPI_SCAN_FAILED;
goto cleanup;
}
siz = x->size;
if (_gnutls_mpi_scan_nz (&key->params.params[4], x->data, siz))
{
gnutls_assert ();
ret = GNUTLS_E_MPI_SCAN_FAILED;
goto cleanup;
}
ret = _gnutls_asn1_encode_privkey (GNUTLS_PK_DSA, &key->key, &key->params);
if (ret < 0)
{
gnutls_assert ();
goto cleanup;
}
key->params.params_nr = DSA_PRIVATE_PARAMS;
key->pk_algorithm = GNUTLS_PK_DSA;
return 0;
cleanup:
gnutls_pk_params_release(&key->params);
return ret;
}
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;
unsigned int hash_len;
bigint_t tmp[2] = { NULL, NULL };
switch (algo)
{
case GNUTLS_PK_EC: /* ECDSA */
{
ecc_key pub;
struct dsa_signature sig;
int stat;
int curve_id = pk_params->flags;
if (is_supported_curve(curve_id) == 0)
return gnutls_assert_val(GNUTLS_E_ECC_UNSUPPORTED_CURVE);
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));
_gnutls_dsa_q_to_hash (algo, pk_params, &hash_len);
if (hash_len > vdata->size)
hash_len = vdata->size;
ret = ecc_verify_hash(&sig, vdata->data, hash_len, &stat, &pub, curve_id);
if (ret != 0 || stat != 1)
{
gnutls_assert();
ret = GNUTLS_E_PK_SIG_VERIFY_FAILED;
}
else
ret = 0;
_gnutls_mpi_release (&tmp[0]);
_gnutls_mpi_release (&tmp[1]);
_ecc_params_clear( &pub);
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));
_gnutls_dsa_q_to_hash (algo, pk_params, &hash_len);
if (hash_len > vdata->size)
hash_len = vdata->size;
ret = _dsa_verify (&pub, hash_len, vdata->data, &sig);
if (ret == 0)
{
gnutls_assert();
ret = GNUTLS_E_PK_SIG_VERIFY_FAILED;
}
else
ret = 0;
_gnutls_mpi_release (&tmp[0]);
_gnutls_mpi_release (&tmp[1]);
break;
}
case GNUTLS_PK_RSA:
{
struct rsa_public_key pub;
_rsa_params_to_pubkey (pk_params, &pub);
ret = _gnutls_mpi_scan_nz (&tmp[0], signature->data, signature->size);
if (ret < 0)
{
gnutls_assert ();
goto cleanup;
}
ret = rsa_pkcs1_verify (&pub, vdata->size, vdata->data, TOMPZ(tmp[0]));
if (ret == 0)
ret = gnutls_assert_val(GNUTLS_E_PK_SIG_VERIFY_FAILED);
else ret = 0;
_gnutls_mpi_release (&tmp[0]);
break;
}
default:
gnutls_assert ();
ret = GNUTLS_E_INTERNAL_ERROR;
goto cleanup;
}
cleanup:
return ret;
}
/* just read A and put it to session */
int
_gnutls_proc_srp_client_kx (gnutls_session_t session, opaque * data,
size_t _data_size)
{
size_t _n_A;
ssize_t data_size = _data_size;
int ret;
DECR_LEN (data_size, 2);
_n_A = _gnutls_read_uint16 (&data[0]);
DECR_LEN (data_size, _n_A);
if (_gnutls_mpi_scan_nz (&A, &data[2], &_n_A) || A == NULL)
{
gnutls_assert ();
return GNUTLS_E_MPI_SCAN_FAILED;
}
_gnutls_dump_mpi ("SRP A: ", A);
_gnutls_dump_mpi ("SRP B: ", B);
/* Checks if A % n == 0.
*/
if ((ret = check_a_mod_n (A, N)) < 0)
{
gnutls_assert ();
return ret;
}
/* Start the SRP calculations.
* - Calculate u
*/
session->key->u = _gnutls_calc_srp_u (A, B, N);
if (session->key->u == NULL)
{
gnutls_assert ();
return GNUTLS_E_MEMORY_ERROR;
}
_gnutls_dump_mpi ("SRP U: ", session->key->u);
/* S = (A * v^u) ^ b % N
*/
S = _gnutls_calc_srp_S1 (A, _b, session->key->u, V, N);
if (S == NULL)
{
gnutls_assert ();
return GNUTLS_E_MEMORY_ERROR;
}
_gnutls_dump_mpi ("SRP S: ", S);
_gnutls_mpi_release (&A);
_gnutls_mpi_release (&_b);
_gnutls_mpi_release (&V);
_gnutls_mpi_release (&session->key->u);
_gnutls_mpi_release (&B);
ret = _gnutls_mpi_dprint (&session->key->key, session->key->KEY);
_gnutls_mpi_release (&S);
if (ret < 0)
{
gnutls_assert ();
return ret;
}
return 0;
}
static int
_wrap_gcry_pk_decrypt (gnutls_pk_algorithm_t algo,
gnutls_datum_t * plaintext,
const gnutls_datum_t * ciphertext,
const gnutls_pk_params_st * pk_params)
{
gcry_sexp_t s_plain = NULL, s_data = NULL, s_pkey = NULL;
int rc = -1;
int ret;
bigint_t data, res;
if (_gnutls_mpi_scan_nz (&data, ciphertext->data, ciphertext->size) != 0)
{
gnutls_assert ();
return GNUTLS_E_MPI_SCAN_FAILED;
}
/* make a sexp from pkey */
switch (algo)
{
case GNUTLS_PK_RSA:
if (pk_params->params_nr >= 6)
rc = gcry_sexp_build (&s_pkey, NULL,
"(private-key(rsa((n%m)(e%m)(d%m)(p%m)(q%m)(u%m))))",
pk_params->params[0], pk_params->params[1],
pk_params->params[2], pk_params->params[3],
pk_params->params[4], pk_params->params[5]);
break;
default:
gnutls_assert ();
ret = GNUTLS_E_INTERNAL_ERROR;
goto cleanup;
}
if (rc != 0)
{
gnutls_assert ();
ret = GNUTLS_E_INTERNAL_ERROR;
goto cleanup;
}
/* put the data into a simple list */
if (gcry_sexp_build (&s_data, NULL, "(enc-val(rsa(a%m)))", data))
{
gnutls_assert ();
ret = GNUTLS_E_INTERNAL_ERROR;
goto cleanup;
}
/* pass it to libgcrypt */
rc = gcry_pk_decrypt (&s_plain, s_data, s_pkey);
if (rc != 0)
{
gnutls_assert ();
ret = GNUTLS_E_PK_DECRYPTION_FAILED;
goto cleanup;
}
res = gcry_sexp_nth_mpi (s_plain, 0, GCRYMPI_FMT_USG);
if (res == NULL)
{
gnutls_assert ();
ret = GNUTLS_E_INTERNAL_ERROR;
goto cleanup;
}
ret = _gnutls_mpi_dprint_size (res, plaintext, ciphertext->size);
_gnutls_mpi_release (&res);
if (ret < 0)
{
gnutls_assert ();
goto cleanup;
}
ret = 0;
cleanup:
_gnutls_mpi_release (&data);
if (s_plain)
gcry_sexp_release (s_plain);
if (s_data)
gcry_sexp_release (s_data);
if (s_pkey)
gcry_sexp_release (s_pkey);
return ret;
}
int
_gnutls_proc_dh_common_client_kx (gnutls_session_t session,
uint8_t * data, size_t _data_size,
bigint_t g, bigint_t p,
gnutls_datum_t* psk_key)
{
uint16_t n_Y;
size_t _n_Y;
int ret;
ssize_t data_size = _data_size;
DECR_LEN (data_size, 2);
n_Y = _gnutls_read_uint16 (&data[0]);
_n_Y = n_Y;
DECR_LEN (data_size, n_Y);
if (_gnutls_mpi_scan_nz (&session->key.client_Y, &data[2], _n_Y))
{
gnutls_assert ();
return GNUTLS_E_MPI_SCAN_FAILED;
}
_gnutls_dh_set_peer_public (session, session->key.client_Y);
ret =
gnutls_calc_dh_key (&session->key.KEY, session->key.client_Y, session->key.dh_secret, p);
if (ret < 0)
return gnutls_assert_val(ret);
_gnutls_mpi_release (&session->key.client_Y);
_gnutls_mpi_release (&session->key.dh_secret);
if (psk_key == NULL)
{
ret = _gnutls_mpi_dprint (session->key.KEY, &session->key.key);
}
else /* In DHE_PSK the key is set differently */
{
gnutls_datum_t tmp_dh_key;
ret = _gnutls_mpi_dprint (session->key.KEY, &tmp_dh_key);
if (ret < 0)
{
gnutls_assert ();
return ret;
}
ret = _gnutls_set_psk_session_key (session, psk_key, &tmp_dh_key);
_gnutls_free_datum (&tmp_dh_key);
}
_gnutls_mpi_release (&session->key.KEY);
if (ret < 0)
{
return ret;
}
return 0;
}
/* Returns the bytes parsed */
int
_gnutls_proc_dh_common_server_kx (gnutls_session_t session,
uint8_t * data, size_t _data_size)
{
uint16_t n_Y, n_g, n_p;
size_t _n_Y, _n_g, _n_p;
uint8_t *data_p;
uint8_t *data_g;
uint8_t *data_Y;
int i, bits, ret;
ssize_t data_size = _data_size;
i = 0;
DECR_LEN (data_size, 2);
n_p = _gnutls_read_uint16 (&data[i]);
i += 2;
DECR_LEN (data_size, n_p);
data_p = &data[i];
i += n_p;
DECR_LEN (data_size, 2);
n_g = _gnutls_read_uint16 (&data[i]);
i += 2;
DECR_LEN (data_size, n_g);
data_g = &data[i];
i += n_g;
DECR_LEN (data_size, 2);
n_Y = _gnutls_read_uint16 (&data[i]);
i += 2;
DECR_LEN (data_size, n_Y);
data_Y = &data[i];
_n_Y = n_Y;
_n_g = n_g;
_n_p = n_p;
if (_gnutls_mpi_scan_nz (&session->key.client_Y, data_Y, _n_Y) != 0)
{
gnutls_assert ();
return GNUTLS_E_MPI_SCAN_FAILED;
}
if (_gnutls_mpi_scan_nz (&session->key.client_g, data_g, _n_g) != 0)
{
gnutls_assert ();
return GNUTLS_E_MPI_SCAN_FAILED;
}
if (_gnutls_mpi_scan_nz (&session->key.client_p, data_p, _n_p) != 0)
{
gnutls_assert ();
return GNUTLS_E_MPI_SCAN_FAILED;
}
bits = _gnutls_dh_get_allowed_prime_bits (session);
if (bits < 0)
{
gnutls_assert ();
return bits;
}
if (_gnutls_mpi_get_nbits (session->key.client_p) < (size_t) bits)
{
/* the prime used by the peer is not acceptable
*/
gnutls_assert ();
return GNUTLS_E_DH_PRIME_UNACCEPTABLE;
}
_gnutls_dh_set_group (session, session->key.client_g,
session->key.client_p);
_gnutls_dh_set_peer_public (session, session->key.client_Y);
ret = n_Y + n_p + n_g + 6;
return ret;
}
static int
proc_rsa_export_server_kx (gnutls_session_t session,
opaque * data, size_t _data_size)
{
uint16_t n_m, n_e;
size_t _n_m, _n_e;
uint8_t *data_m;
uint8_t *data_e;
int i, sigsize;
gnutls_datum_t vparams, signature;
int ret;
ssize_t data_size = _data_size;
cert_auth_info_t info;
gnutls_pcert_st peer_cert;
info = _gnutls_get_auth_info (session);
if (info == NULL || info->ncerts == 0)
{
gnutls_assert ();
/* we need this in order to get peer's certificate */
return GNUTLS_E_INTERNAL_ERROR;
}
i = 0;
DECR_LEN (data_size, 2);
n_m = _gnutls_read_uint16 (&data[i]);
i += 2;
DECR_LEN (data_size, n_m);
data_m = &data[i];
i += n_m;
DECR_LEN (data_size, 2);
n_e = _gnutls_read_uint16 (&data[i]);
i += 2;
DECR_LEN (data_size, n_e);
data_e = &data[i];
i += n_e;
_n_e = n_e;
_n_m = n_m;
if (_gnutls_mpi_scan_nz (&session->key->rsa[0], data_m, _n_m) != 0)
{
gnutls_assert ();
return GNUTLS_E_MPI_SCAN_FAILED;
}
if (_gnutls_mpi_scan_nz (&session->key->rsa[1], data_e, _n_e) != 0)
{
gnutls_assert ();
return GNUTLS_E_MPI_SCAN_FAILED;
}
_gnutls_rsa_export_set_pubkey (session, session->key->rsa[1],
session->key->rsa[0]);
/* VERIFY SIGNATURE */
vparams.size = n_m + n_e + 4;
vparams.data = data;
DECR_LEN (data_size, 2);
sigsize = _gnutls_read_uint16 (&data[vparams.size]);
DECR_LEN (data_size, sigsize);
signature.data = &data[vparams.size + 2];
signature.size = sigsize;
if ((ret =
_gnutls_get_auth_info_pcert (&peer_cert,
session->security_parameters.cert_type,
info)) < 0)
{
gnutls_assert ();
return ret;
}
ret =
_gnutls_handshake_verify_data (session, &peer_cert, &vparams, &signature,
GNUTLS_SIGN_UNKNOWN);
gnutls_pcert_deinit (&peer_cert);
if (ret < 0)
{
gnutls_assert ();
}
return ret;
}
static int
_wrap_gcry_pk_encrypt (gnutls_pk_algorithm_t algo,
gnutls_datum_t * ciphertext,
const gnutls_datum_t * plaintext,
const gnutls_pk_params_st * pk_params)
{
gcry_sexp_t s_ciph = NULL, s_data = NULL, s_pkey = NULL;
int rc = -1;
int ret;
bigint_t data, res;
gcry_sexp_t list;
if (_gnutls_mpi_scan_nz (&data, plaintext->data, plaintext->size) != 0)
{
gnutls_assert ();
return GNUTLS_E_MPI_SCAN_FAILED;
}
/* make a sexp from pkey */
switch (algo)
{
case GNUTLS_PK_RSA:
if (pk_params->params_nr >= 2)
rc = gcry_sexp_build (&s_pkey, NULL,
"(public-key(rsa(n%m)(e%m)))",
pk_params->params[0], pk_params->params[1]);
break;
default:
gnutls_assert ();
ret = GNUTLS_E_INTERNAL_ERROR;
goto cleanup;
}
if (rc != 0)
{
gnutls_assert ();
ret = GNUTLS_E_INTERNAL_ERROR;
goto cleanup;
}
/* put the data into a simple list */
if (gcry_sexp_build (&s_data, NULL, "%m", data))
{
gnutls_assert ();
ret = GNUTLS_E_MEMORY_ERROR;
goto cleanup;
}
/* pass it to libgcrypt */
rc = gcry_pk_encrypt (&s_ciph, s_data, s_pkey);
if (rc != 0)
{
gnutls_assert ();
ret = GNUTLS_E_PK_ENCRYPTION_FAILED;
goto cleanup;
}
list = gcry_sexp_find_token (s_ciph, "a", 0);
if (list == NULL)
{
gnutls_assert ();
ret = GNUTLS_E_INTERNAL_ERROR;
goto cleanup;
}
res = gcry_sexp_nth_mpi (list, 1, GCRYMPI_FMT_USG);
gcry_sexp_release (list);
if (res == NULL)
{
gnutls_assert ();
ret = GNUTLS_E_INTERNAL_ERROR;
goto cleanup;
}
ret = _gnutls_mpi_dprint_size (res, ciphertext, plaintext->size);
_gnutls_mpi_release (&res);
if (ret < 0)
{
gnutls_assert ();
goto cleanup;
}
ret = 0;
cleanup:
_gnutls_mpi_release (&data);
if (s_ciph)
gcry_sexp_release (s_ciph);
if (s_data)
gcry_sexp_release (s_data);
if (s_pkey)
gcry_sexp_release (s_pkey);
return ret;
}
/**
* gnutls_x509_privkey_import_rsa_raw2:
* @key: The structure to store the parsed key
* @m: holds the modulus
* @e: holds the public exponent
* @d: holds the private exponent
* @p: holds the first prime (p)
* @q: holds the second prime (q)
* @u: holds the coefficient
* @e1: holds e1 = d mod (p-1)
* @e2: holds e2 = d mod (q-1)
*
* This function will convert the given RSA raw parameters to the
* native #gnutls_x509_privkey_t format. The output will be stored in
* @key.
*
* Returns: On success, %GNUTLS_E_SUCCESS (0) is returned, otherwise a
* negative error value.
**/
int
gnutls_x509_privkey_import_rsa_raw2 (gnutls_x509_privkey_t key,
const gnutls_datum_t * m,
const gnutls_datum_t * e,
const gnutls_datum_t * d,
const gnutls_datum_t * p,
const gnutls_datum_t * q,
const gnutls_datum_t * u,
const gnutls_datum_t * e1,
const gnutls_datum_t * e2)
{
int ret;
size_t siz = 0;
if (key == NULL)
{
gnutls_assert ();
return GNUTLS_E_INVALID_REQUEST;
}
gnutls_pk_params_init(&key->params);
siz = m->size;
if (_gnutls_mpi_scan_nz (&key->params.params[0], m->data, siz))
{
gnutls_assert ();
ret = GNUTLS_E_MPI_SCAN_FAILED;
goto cleanup;
}
key->params.params_nr++;
siz = e->size;
if (_gnutls_mpi_scan_nz (&key->params.params[1], e->data, siz))
{
gnutls_assert ();
ret = GNUTLS_E_MPI_SCAN_FAILED;
goto cleanup;
}
key->params.params_nr++;
siz = d->size;
if (_gnutls_mpi_scan_nz (&key->params.params[2], d->data, siz))
{
gnutls_assert ();
ret = GNUTLS_E_MPI_SCAN_FAILED;
goto cleanup;
}
key->params.params_nr++;
siz = p->size;
if (_gnutls_mpi_scan_nz (&key->params.params[3], p->data, siz))
{
gnutls_assert ();
ret = GNUTLS_E_MPI_SCAN_FAILED;
goto cleanup;
}
key->params.params_nr++;
siz = q->size;
if (_gnutls_mpi_scan_nz (&key->params.params[4], q->data, siz))
{
gnutls_assert ();
ret = GNUTLS_E_MPI_SCAN_FAILED;
goto cleanup;
}
key->params.params_nr++;
siz = u->size;
if (_gnutls_mpi_scan_nz (&key->params.params[5], u->data, siz))
{
gnutls_assert ();
ret = GNUTLS_E_MPI_SCAN_FAILED;
goto cleanup;
}
key->params.params_nr++;
if (e1 && e2)
{
siz = e1->size;
if (_gnutls_mpi_scan_nz (&key->params.params[6], e1->data, siz))
{
gnutls_assert ();
ret = GNUTLS_E_MPI_SCAN_FAILED;
goto cleanup;
}
key->params.params_nr++;
siz = e2->size;
if (_gnutls_mpi_scan_nz (&key->params.params[7], e2->data, siz))
{
gnutls_assert ();
ret = GNUTLS_E_MPI_SCAN_FAILED;
goto cleanup;
}
key->params.params_nr++;
}
ret = _gnutls_pk_fixup (GNUTLS_PK_RSA, GNUTLS_IMPORT, &key->params);
if (ret < 0)
{
gnutls_assert ();
goto cleanup;
}
ret = _gnutls_asn1_encode_privkey (GNUTLS_PK_RSA, &key->key, &key->params);
if (ret < 0)
{
gnutls_assert ();
goto cleanup;
}
key->params.params_nr = RSA_PRIVATE_PARAMS;
key->pk_algorithm = GNUTLS_PK_RSA;
return 0;
cleanup:
gnutls_pk_params_release(&key->params);
return ret;
}
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;
plaintext->data = NULL;
/* make a sexp from pkey */
switch (algo)
{
case GNUTLS_PK_RSA:
{
struct rsa_private_key priv;
struct rsa_public_key pub;
unsigned length;
bigint_t c;
_rsa_params_to_privkey (pk_params, &priv);
_rsa_params_to_pubkey (pk_params, &pub);
if (_gnutls_mpi_scan_nz (&c, ciphertext->data, ciphertext->size) != 0)
{
ret = gnutls_assert_val(GNUTLS_E_MPI_SCAN_FAILED);
goto cleanup;
}
length = pub.size;
plaintext->data = gnutls_malloc(length);
if (plaintext->data == NULL)
{
ret = gnutls_assert_val(GNUTLS_E_MEMORY_ERROR);
goto cleanup;
}
ret = rsa_decrypt_tr(&pub, &priv, NULL, rnd_func, &length, plaintext->data,
TOMPZ(c));
_gnutls_mpi_release (&c);
plaintext->size = length;
if (ret == 0)
{
ret = gnutls_assert_val(GNUTLS_E_DECRYPTION_FAILED);
goto cleanup;
}
break;
}
default:
gnutls_assert ();
ret = GNUTLS_E_INTERNAL_ERROR;
goto cleanup;
}
ret = 0;
cleanup:
if (ret < 0)
gnutls_free(plaintext->data);
return ret;
}
/* Send the first key exchange message ( g, n, s) and append the verifier algorithm number
* Data is allocated by the caller, and should have data_size size.
*/
int
_gnutls_gen_srp_server_kx (gnutls_session_t session, opaque ** data)
{
int ret;
uint8_t *data_n, *data_s;
uint8_t *data_g;
char *username;
SRP_PWD_ENTRY *pwd_entry;
srp_server_auth_info_t info;
ssize_t data_size;
size_t n_b, tmp_size;
char buf[64];
uint8_t *data_b;
if ((ret =
_gnutls_auth_info_set (session, GNUTLS_CRD_SRP,
sizeof (srp_server_auth_info_st), 1)) < 0)
{
gnutls_assert ();
return ret;
}
info = _gnutls_get_auth_info (session);
username = info->username;
_gnutls_str_cpy (username, MAX_SRP_USERNAME,
session->security_parameters.extensions.srp_username);
ret = _gnutls_srp_pwd_read_entry (session, username, &pwd_entry);
if (ret < 0)
{
gnutls_assert ();
return ret;
}
/* copy from pwd_entry to local variables (actually in session) */
tmp_size = pwd_entry->g.size;
if (_gnutls_mpi_scan_nz (&G, pwd_entry->g.data, &tmp_size) < 0)
{
gnutls_assert ();
return GNUTLS_E_MPI_SCAN_FAILED;
}
tmp_size = pwd_entry->n.size;
if (_gnutls_mpi_scan_nz (&N, pwd_entry->n.data, &tmp_size) < 0)
{
gnutls_assert ();
return GNUTLS_E_MPI_SCAN_FAILED;
}
tmp_size = pwd_entry->v.size;
if (_gnutls_mpi_scan_nz (&V, pwd_entry->v.data, &tmp_size) < 0)
{
gnutls_assert ();
return GNUTLS_E_MPI_SCAN_FAILED;
}
/* Calculate: B = (k*v + g^b) % N
*/
B = _gnutls_calc_srp_B (&_b, G, N, V);
if (B == NULL)
{
gnutls_assert ();
return GNUTLS_E_MEMORY_ERROR;
}
if (_gnutls_mpi_print (NULL, &n_b, B) != 0)
{
gnutls_assert ();
return GNUTLS_E_MPI_PRINT_FAILED;
}
/* Allocate size to hold the N, g, s, B
*/
data_size = (pwd_entry->n.size + 2 + pwd_entry->g.size + 2 +
pwd_entry->salt.size + 1) + (n_b + 2);
(*data) = gnutls_malloc (data_size);
if ((*data) == NULL)
{
gnutls_assert ();
return GNUTLS_E_MEMORY_ERROR;
}
/* copy N (mod n)
*/
data_n = *data;
_gnutls_write_datum16 (data_n, pwd_entry->n);
/* copy G (generator) to data
*/
data_g = &data_n[2 + pwd_entry->n.size];
_gnutls_write_datum16 (data_g, pwd_entry->g);
/* copy the salt
*/
data_s = &data_g[2 + pwd_entry->g.size];
_gnutls_write_datum8 (data_s, pwd_entry->salt);
/* Copy the B value
*/
data_b = &data_s[1 + pwd_entry->salt.size];
if (_gnutls_mpi_print (&data_b[2], &n_b, B) != 0)
{
gnutls_assert();
return GNUTLS_E_MPI_PRINT_FAILED;
}
_gnutls_write_uint16 (n_b, data_b);
_gnutls_hard_log ("INT: SRP B[%d]: %s\n", n_b,
_gnutls_bin2hex (&data_b[2], n_b, buf, sizeof (buf)));
_gnutls_srp_entry_free (pwd_entry);
return data_size;
}
/* in case of DSA puts into data, r,s
*/
static int
_wrap_gcry_pk_sign (gnutls_pk_algorithm_t algo, gnutls_datum_t * signature,
const gnutls_datum_t * vdata,
const gnutls_pk_params_st * pk_params)
{
gcry_sexp_t s_hash = NULL, s_key = NULL, s_sig = NULL;
gcry_sexp_t list = NULL;
int rc = -1, ret;
bigint_t hash;
bigint_t res[2] = { NULL, NULL };
if (_gnutls_mpi_scan_nz (&hash, vdata->data, vdata->size) != 0)
{
gnutls_assert ();
return GNUTLS_E_MPI_SCAN_FAILED;
}
/* make a sexp from pkey */
switch (algo)
{
case GNUTLS_PK_DSA:
if (pk_params->params_nr >= 5)
rc = gcry_sexp_build (&s_key, NULL,
"(private-key(dsa(p%m)(q%m)(g%m)(y%m)(x%m)))",
pk_params->params[0], pk_params->params[1],
pk_params->params[2], pk_params->params[3],
pk_params->params[4]);
else
{
gnutls_assert ();
}
break;
case GNUTLS_PK_RSA:
if (pk_params->params_nr >= 6)
rc = gcry_sexp_build (&s_key, NULL,
"(private-key(rsa((n%m)(e%m)(d%m)(p%m)(q%m)(u%m))))",
pk_params->params[0], pk_params->params[1],
pk_params->params[2], pk_params->params[3],
pk_params->params[4], pk_params->params[5]);
else
{
gnutls_assert ();
}
break;
default:
gnutls_assert ();
ret = GNUTLS_E_INTERNAL_ERROR;
goto cleanup;
}
if (rc != 0)
{
gnutls_assert ();
ret = GNUTLS_E_INTERNAL_ERROR;
goto cleanup;
}
/* put the data into a simple list */
if (gcry_sexp_build (&s_hash, NULL, "%m", hash))
{
gnutls_assert ();
ret = GNUTLS_E_INTERNAL_ERROR;
goto cleanup;
}
/* pass it to libgcrypt */
rc = gcry_pk_sign (&s_sig, s_hash, s_key);
if (rc != 0)
{
gnutls_assert ();
ret = GNUTLS_E_PK_SIGN_FAILED;
goto cleanup;
}
ret = GNUTLS_E_INTERNAL_ERROR;
switch (algo)
{
case GNUTLS_PK_DSA:
{
list = gcry_sexp_find_token (s_sig, "r", 0);
if (list == NULL)
{
gnutls_assert ();
ret = GNUTLS_E_INTERNAL_ERROR;
goto cleanup;
}
res[0] = gcry_sexp_nth_mpi (list, 1, GCRYMPI_FMT_USG);
gcry_sexp_release (list);
list = gcry_sexp_find_token (s_sig, "s", 0);
if (list == NULL)
{
gnutls_assert ();
ret = GNUTLS_E_INTERNAL_ERROR;
goto cleanup;
}
res[1] = gcry_sexp_nth_mpi (list, 1, GCRYMPI_FMT_USG);
gcry_sexp_release (list);
ret = _gnutls_encode_ber_rs (signature, res[0], res[1]);
if (ret < 0)
{
gnutls_assert ();
goto cleanup;
}
}
break;
case GNUTLS_PK_RSA:
{
list = gcry_sexp_find_token (s_sig, "s", 0);
if (list == NULL)
{
gnutls_assert ();
ret = GNUTLS_E_INTERNAL_ERROR;
goto cleanup;
}
res[0] = gcry_sexp_nth_mpi (list, 1, GCRYMPI_FMT_USG);
gcry_sexp_release (list);
ret = _gnutls_mpi_dprint (res[0], signature);
if (ret < 0)
{
gnutls_assert ();
goto cleanup;
}
}
break;
default:
gnutls_assert ();
ret = GNUTLS_E_INTERNAL_ERROR;
goto cleanup;
}
ret = 0;
cleanup:
_gnutls_mpi_release (&hash);
if (res[0])
_gnutls_mpi_release (&res[0]);
if (res[1])
_gnutls_mpi_release (&res[1]);
if (s_sig)
gcry_sexp_release (s_sig);
if (s_hash)
gcry_sexp_release (s_hash);
if (s_key)
gcry_sexp_release (s_key);
return ret;
}