guchar*
gkm_data_der_write_private_pkcs8_crypted (gcry_sexp_t skey, const gchar *password,
gsize n_password, gsize *n_data)
{
gcry_error_t gcry;
gcry_cipher_hd_t cih;
GNode *asn = NULL;
guchar *key, *data;
gsize n_key, block = 0;
/* Encode the key in normal pkcs8 fashion */
key = gkm_data_der_write_private_pkcs8_plain (skey, &n_key);
if (key == NULL)
return NULL;
asn = egg_asn1x_create (pkix_asn1_tab, "pkcs-8-EncryptedPrivateKeyInfo");
g_return_val_if_fail (asn, NULL);
/* Create a and write out a cipher used for encryption */
cih = prepare_and_encode_pkcs8_cipher (asn, password, n_password, &block);
g_return_val_if_fail (cih, NULL);
/* Pad the block of data */
if(block > 1) {
gsize pad;
guchar *padded;
pad = block - (n_key % block);
if (pad == 0)
pad = block;
padded = egg_secure_realloc (key, n_key + pad);
memset (padded + n_key, pad, pad);
key = padded;
n_key += pad;
}
gcry = gcry_cipher_encrypt (cih, key, n_key, NULL, 0);
g_return_val_if_fail (gcry == 0, NULL);
gcry_cipher_close (cih);
if (!egg_asn1x_set_string_as_raw (egg_asn1x_node (asn, "encryptedData", NULL),
key, n_key, egg_secure_free))
g_return_val_if_reached (NULL);
data = egg_asn1x_encode (asn, NULL, n_data);
if (data == NULL)
g_warning ("couldn't encode encrypted pkcs8 key: %s", egg_asn1x_message (asn));
egg_asn1x_destroy (asn);
return data;
}
static gcry_cipher_hd_t
prepare_and_encode_pkcs8_cipher (GNode *asn, const gchar *password,
gsize n_password, gsize *n_block)
{
GNode *asn1_params = NULL;
gcry_cipher_hd_t cih;
guchar salt[8];
gcry_error_t gcry;
guchar *key, *iv, *portion;
gsize n_key, n_portion;
int iterations;
init_quarks ();
/* Make sure the encryption algorithm works */
g_return_val_if_fail (gcry_cipher_algo_info (OID_PKCS12_PBE_3DES_SHA1,
GCRYCTL_TEST_ALGO, NULL, 0), NULL);
/* The encryption algorithm */
if(!egg_asn1x_set_oid_as_quark (egg_asn1x_node (asn, "encryptionAlgorithm", "algorithm", NULL),
OID_PKCS12_PBE_3DES_SHA1))
g_return_val_if_reached (NULL);
/* Randomize some input for the password based secret */
iterations = 1000 + (int) (1000.0 * rand () / (RAND_MAX + 1.0));
gcry_create_nonce (salt, sizeof (salt));
/* Allocate space for the key and iv */
n_key = gcry_cipher_get_algo_keylen (GCRY_CIPHER_3DES);
*n_block = gcry_cipher_get_algo_blklen (GCRY_MD_SHA1);
g_return_val_if_fail (n_key && *n_block, NULL);
if (!egg_symkey_generate_pkcs12 (GCRY_CIPHER_3DES, GCRY_MD_SHA1,
password, n_password, salt,
sizeof (salt), iterations, &key, &iv))
g_return_val_if_reached (NULL);
/* Now write out the parameters */
asn1_params = egg_asn1x_create (pkix_asn1_tab, "pkcs-12-PbeParams");
g_return_val_if_fail (asn1_params, NULL);
if (!egg_asn1x_set_string_as_raw (egg_asn1x_node (asn1_params, "salt", NULL), salt, sizeof (salt), NULL))
g_return_val_if_reached (NULL);
if (!egg_asn1x_set_integer_as_ulong (egg_asn1x_node (asn1_params, "iterations", NULL), iterations))
g_return_val_if_reached (NULL);
portion = egg_asn1x_encode (asn1_params, NULL, &n_portion);
if (portion == NULL) {
g_warning ("couldn't encode pkcs8 params key: %s", egg_asn1x_message (asn1_params));
g_return_val_if_reached (NULL);
}
if (!egg_asn1x_set_raw_element (egg_asn1x_node (asn, "encryptionAlgorithm", "parameters", NULL),
portion, n_portion, g_free))
g_return_val_if_reached (NULL);
/* Now make a cipher that matches what we wrote out */
gcry = gcry_cipher_open (&cih, GCRY_CIPHER_3DES, GCRY_CIPHER_MODE_CBC, 0);
g_return_val_if_fail (gcry == 0, NULL);
g_return_val_if_fail (cih, NULL);
gcry_cipher_setiv (cih, iv, *n_block);
gcry_cipher_setkey (cih, key, n_key);
g_free (iv);
egg_secure_free (key);
egg_asn1x_destroy (asn1_params);
return cih;
}
guchar*
gkm_data_der_write_private_pkcs8_plain (gcry_sexp_t skey, gsize *n_data)
{
GNode *asn = NULL;
int algorithm;
gboolean is_priv;
GQuark oid;
guchar *params, *key, *data;
gsize n_params, n_key;
init_quarks ();
/* Parse and check that the key is for real */
if (!gkm_sexp_parse_key (skey, &algorithm, &is_priv, NULL))
g_return_val_if_reached (NULL);
g_return_val_if_fail (is_priv == TRUE, NULL);
asn = egg_asn1x_create (pkix_asn1_tab, "pkcs-8-PrivateKeyInfo");
g_return_val_if_fail (asn, NULL);
/* Write out the version */
if (!egg_asn1x_set_integer_as_ulong (egg_asn1x_node (asn, "version", NULL), 0))
g_return_val_if_reached (NULL);
/* Per algorithm differences */
switch (algorithm)
{
/* RSA gets encoded in a standard simple way */
case GCRY_PK_RSA:
oid = OID_PKIX1_RSA;
params = NULL;
n_params = 0;
key = gkm_data_der_write_private_key_rsa (skey, &n_key);
break;
/* DSA gets incoded with the params seperate */
case GCRY_PK_DSA:
oid = OID_PKIX1_DSA;
key = gkm_data_der_write_private_key_dsa_part (skey, &n_key);
params = gkm_data_der_write_private_key_dsa_params (skey, &n_params);
break;
default:
g_warning ("trying to serialize unsupported private key algorithm: %d", algorithm);
return NULL;
};
/* Write out the algorithm */
if (!egg_asn1x_set_oid_as_quark (egg_asn1x_node (asn, "privateKeyAlgorithm", "algorithm", NULL), oid))
g_return_val_if_reached (NULL);
/* Write out the parameters */
if (params) {
if (!egg_asn1x_set_raw_element (egg_asn1x_node (asn, "privateKeyAlgorithm", "parameters", NULL),
params, n_params, egg_secure_free))
g_return_val_if_reached (NULL);
}
/* Write out the key portion */
if (!egg_asn1x_set_string_as_raw (egg_asn1x_node (asn, "privateKey", NULL),
key, n_key, egg_secure_free))
g_return_val_if_reached (NULL);
data = egg_asn1x_encode (asn, egg_secure_realloc, n_data);
if (data == NULL)
g_warning ("couldn't encode private pkcs8 key: %s", egg_asn1x_message (asn));
egg_asn1x_destroy (asn);
return data;
}
static gcry_cipher_hd_t
prepare_and_encode_pkcs8_cipher (GNode *asn, const gchar *password,
gsize n_password, gsize *n_block)
{
GNode *asn1_params = NULL;
gcry_cipher_hd_t cih;
guchar *salt;
gsize n_salt;
gcry_error_t gcry;
guchar *key, *iv;
gsize n_key;
int iterations;
init_quarks ();
/* Make sure the encryption algorithm works */
g_return_val_if_fail (gcry_cipher_algo_info (gcry_cipher_map_name (g_quark_to_string (OID_PKCS12_PBE_3DES_SHA1)),
GCRYCTL_TEST_ALGO, NULL, 0) == 0, NULL);
/* The encryption algorithm */
if(!egg_asn1x_set_oid_as_quark (egg_asn1x_node (asn, "encryptionAlgorithm", "algorithm", NULL),
OID_PKCS12_PBE_3DES_SHA1))
g_return_val_if_reached (NULL);
/* Randomize some input for the password based secret */
iterations = g_random_int_range (1000, 4096);
n_salt = 8;
salt = g_malloc (n_salt);
gcry_create_nonce (salt, n_salt);
/* Allocate space for the key and iv */
n_key = gcry_cipher_get_algo_keylen (GCRY_CIPHER_3DES);
*n_block = gcry_cipher_get_algo_blklen (GCRY_MD_SHA1);
g_return_val_if_fail (n_key && *n_block, NULL);
if (!egg_symkey_generate_pkcs12 (GCRY_CIPHER_3DES, GCRY_MD_SHA1,
password, n_password, salt,
sizeof (salt), iterations, &key, &iv))
g_return_val_if_reached (NULL);
/* Now write out the parameters */
asn1_params = egg_asn1x_create (pkix_asn1_tab, "pkcs-12-PbeParams");
g_return_val_if_fail (asn1_params, NULL);
egg_asn1x_set_string_as_raw (egg_asn1x_node (asn1_params, "salt", NULL), salt, n_salt, g_free);
egg_asn1x_set_integer_as_ulong (egg_asn1x_node (asn1_params, "iterations", NULL), iterations);
egg_asn1x_set_any_from (egg_asn1x_node (asn, "encryptionAlgorithm", "parameters", NULL), asn1_params);
/* Now make a cipher that matches what we wrote out */
gcry = gcry_cipher_open (&cih, GCRY_CIPHER_3DES, GCRY_CIPHER_MODE_CBC, 0);
g_return_val_if_fail (gcry == 0, NULL);
g_return_val_if_fail (cih, NULL);
gcry_cipher_setiv (cih, iv, *n_block);
gcry_cipher_setkey (cih, key, n_key);
g_free (iv);
egg_secure_free (key);
egg_asn1x_destroy (asn1_params);
return cih;
}
