2 Copyright (C) 2013-2017 Carl Hetherington <cth@carlh.net>
4 This file is part of libdcp.
6 libdcp is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 libdcp is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with libdcp. If not, see <http://www.gnu.org/licenses/>.
19 In addition, as a special exception, the copyright holders give
20 permission to link the code of portions of this program with the
21 OpenSSL library under certain conditions as described in each
22 individual source file, and distribute linked combinations
25 You must obey the GNU General Public License in all respects
26 for all of the code used other than OpenSSL. If you modify
27 file(s) with this exception, you may extend this exception to your
28 version of the file(s), but you are not obligated to do so. If you
29 do not wish to do so, delete this exception statement from your
30 version. If you delete this exception statement from all source
31 files in the program, then also delete it here.
34 #include "decrypted_kdm.h"
35 #include "decrypted_kdm_key.h"
36 #include "encrypted_kdm.h"
38 #include "reel_asset.h"
40 #include "exceptions.h"
42 #include "certificate_chain.h"
43 #include "dcp_assert.h"
44 #include "compose.hpp"
45 #include <asdcp/AS_DCP.h>
46 #include <asdcp/KM_util.h>
47 #include <openssl/rsa.h>
48 #include <openssl/pem.h>
49 #include <openssl/err.h>
50 #include <boost/foreach.hpp>
60 using boost::shared_ptr;
61 using boost::optional;
64 /* Magic value specified by SMPTE S430-1-2006 */
65 static uint8_t smpte_structure_id[] = { 0xf1, 0xdc, 0x12, 0x44, 0x60, 0x16, 0x9a, 0x0e, 0x85, 0xbc, 0x30, 0x06, 0x42, 0xf8, 0x66, 0xab };
68 put (uint8_t ** d, string s)
70 memcpy (*d, s.c_str(), s.length());
75 put (uint8_t ** d, uint8_t const * s, int N)
82 DecryptedKDM::put_uuid (uint8_t ** d, string id)
84 /* 32 hex digits plus some hyphens */
85 DCP_ASSERT (id.length() == 36);
92 "%02hhx%02hhx%02hhx%02hhx-%02hhx%02hhx-%02hhx%02hhx-%02hhx%02hhx-%02hhx%02hhx%02hhx%02hhx%02hhx%02hhx",
93 *d + 0, *d + 1, *d + 2, *d + 3, *d + 4, *d + 5, *d + 6, *d + 7,
94 *d + 8, *d + 9, *d + 10, *d + 11, *d + 12, *d + 13, *d + 14, *d + 15
101 DecryptedKDM::get_uuid (unsigned char ** p)
104 #ifdef LIBDCP_WINDOWS
109 buffer, sizeof(buffer), "%02hhx%02hhx%02hhx%02hhx-%02hhx%02hhx-%02hhx%02hhx-%02hhx%02hhx-%02hhx%02hhx%02hhx%02hhx%02hhx%02hhx",
110 (*p)[0], (*p)[1], (*p)[2], (*p)[3], (*p)[4], (*p)[5], (*p)[6], (*p)[7],
111 (*p)[8], (*p)[9], (*p)[10], (*p)[11], (*p)[12], (*p)[13], (*p)[14], (*p)[15]
119 get (uint8_t ** p, int N)
122 for (int i = 0; i < N; ++i) {
130 DecryptedKDM::DecryptedKDM (EncryptedKDM const & kdm, string private_key)
132 /* Read the private key */
134 BIO* bio = BIO_new_mem_buf (const_cast<char *> (private_key.c_str ()), -1);
136 throw MiscError ("could not create memory BIO");
139 RSA* rsa = PEM_read_bio_RSAPrivateKey (bio, 0, 0, 0);
141 throw FileError ("could not read RSA private key file", private_key, errno);
144 /* Use the private key to decrypt the keys */
146 BOOST_FOREACH (string const & i, kdm.keys ()) {
147 /* Decode the base-64-encoded cipher value from the KDM */
148 unsigned char cipher_value[256];
149 int const cipher_value_len = base64_decode (i, cipher_value, sizeof (cipher_value));
152 unsigned char * decrypted = new unsigned char[RSA_size(rsa)];
153 int const decrypted_len = RSA_private_decrypt (cipher_value_len, cipher_value, decrypted, rsa, RSA_PKCS1_OAEP_PADDING);
154 if (decrypted_len == -1) {
156 throw KDMDecryptionError (ERR_error_string (ERR_get_error(), 0), cipher_value_len, rsa->n->dmax);
159 unsigned char* p = decrypted;
160 switch (decrypted_len) {
164 /* 0 is structure id (fixed sequence specified by standard) [16 bytes] */
166 /* 16 is is signer thumbprint [20 bytes] */
168 /* 36 is CPL id [16 bytes] */
169 string const cpl_id = get_uuid (&p);
170 /* 52 is key id [16 bytes] */
171 string const key_id = get_uuid (&p);
172 /* 68 is not-valid-before (a string) [25 bytes] */
174 /* 93 is not-valid-after (a string) [25 bytes] */
176 /* 118 is the key [ASDCP::KeyLen bytes] */
177 add_key (optional<string>(), key_id, Key (p), cpl_id, INTEROP);
183 /* 0 is structure id (fixed sequence specified by standard) [16 bytes] */
184 DCP_ASSERT (memcmp (p, smpte_structure_id, 16) == 0);
186 /* 16 is is signer thumbprint [20 bytes] */
188 /* 36 is CPL id [16 bytes] */
189 string const cpl_id = get_uuid (&p);
190 /* 52 is key type [4 bytes] */
191 string const key_type = get (&p, 4);
192 /* 56 is key id [16 bytes] */
193 string const key_id = get_uuid (&p);
194 /* 72 is not-valid-before (a string) [25 bytes] */
196 /* 97 is not-valid-after (a string) [25 bytes] */
198 /* 112 is the key [ASDCP::KeyLen bytes] */
199 add_key (key_type, key_id, Key (p), cpl_id, SMPTE);
212 _annotation_text = kdm.annotation_text ();
213 _content_title_text = kdm.content_title_text ();
214 _issue_date = kdm.issue_date ();
217 DecryptedKDM::DecryptedKDM (
218 LocalTime not_valid_before,
219 LocalTime not_valid_after,
220 string annotation_text,
221 string content_title_text,
224 : _not_valid_before (not_valid_before)
225 , _not_valid_after (not_valid_after)
226 , _annotation_text (annotation_text)
227 , _content_title_text (content_title_text)
228 , _issue_date (issue_date)
233 DecryptedKDM::DecryptedKDM (
235 map<shared_ptr<const ReelMXF>, Key> keys,
236 LocalTime not_valid_before,
237 LocalTime not_valid_after,
238 string annotation_text,
239 string content_title_text,
242 : _not_valid_before (not_valid_before)
243 , _not_valid_after (not_valid_after)
244 , _annotation_text (annotation_text)
245 , _content_title_text (content_title_text)
246 , _issue_date (issue_date)
248 for (map<shared_ptr<const ReelMXF>, Key>::const_iterator i = keys.begin(); i != keys.end(); ++i) {
249 add_key (i->first->key_type(), i->first->key_id().get(), i->second, cpl_id, SMPTE);
253 DecryptedKDM::DecryptedKDM (
254 shared_ptr<const CPL> cpl,
256 LocalTime not_valid_before,
257 LocalTime not_valid_after,
258 string annotation_text,
259 string content_title_text,
262 : _not_valid_before (not_valid_before)
263 , _not_valid_after (not_valid_after)
264 , _annotation_text (annotation_text)
265 , _content_title_text (content_title_text)
266 , _issue_date (issue_date)
268 /* Create DecryptedKDMKey objects for each encryptable asset */
269 bool did_one = false;
270 BOOST_FOREACH(shared_ptr<const ReelAsset> i, cpl->reel_assets ()) {
271 shared_ptr<const ReelMXF> mxf = boost::dynamic_pointer_cast<const ReelMXF> (i);
272 if (mxf && mxf->key_id ()) {
273 add_key (mxf->key_type(), mxf->key_id().get(), key, cpl->id(), SMPTE);
279 throw NotEncryptedError (cpl->id ());
283 /** @param type (MDIK, MDAK etc.)
284 * @param key_id Key ID.
285 * @param key The actual symmetric key.
286 * @param cpl_id ID of CPL that the key is for.
289 DecryptedKDM::add_key (optional<string> type, string key_id, Key key, string cpl_id, Standard standard)
291 _keys.push_back (DecryptedKDMKey (type, key_id, key, cpl_id, standard));
295 DecryptedKDM::add_key (DecryptedKDMKey key)
297 _keys.push_back (key);
301 DecryptedKDM::encrypt (
302 shared_ptr<const CertificateChain> signer, Certificate recipient, vector<Certificate> trusted_devices, Formulation formulation
305 list<pair<string, string> > key_ids;
307 BOOST_FOREACH (DecryptedKDMKey const & i, _keys) {
308 /* We're making SMPTE keys so we must have a type for each one */
309 DCP_ASSERT (i.type());
310 key_ids.push_back (make_pair (i.type().get(), i.id ()));
312 /* XXX: SMPTE only */
316 put (&p, smpte_structure_id, 16);
318 base64_decode (signer->leaf().thumbprint (), p, 20);
321 put_uuid (&p, i.cpl_id ());
322 put (&p, i.type().get());
323 put_uuid (&p, i.id ());
324 put (&p, _not_valid_before.as_string ());
325 put (&p, _not_valid_after.as_string ());
326 put (&p, i.key().value(), ASDCP::KeyLen);
328 /* Encrypt using the projector's public key */
329 RSA* rsa = recipient.public_key ();
330 unsigned char encrypted[RSA_size(rsa)];
331 int const encrypted_len = RSA_public_encrypt (p - block, block, encrypted, rsa, RSA_PKCS1_OAEP_PADDING);
332 if (encrypted_len == -1) {
333 throw MiscError (String::compose ("Could not encrypt KDM (%1)", ERR_error_string (ERR_get_error(), 0)));
336 /* Lazy overallocation */
337 char out[encrypted_len * 2];
338 Kumu::base64encode (encrypted, encrypted_len, out, encrypted_len * 2);
339 int const N = strlen (out);
341 for (int i = 0; i < N; ++i) {
342 if (i > 0 && (i % 64) == 0) {
348 keys.push_back (lines);
351 string device_list_description = recipient.subject_common_name ();
352 if (device_list_description.find (".") != string::npos) {
353 device_list_description = device_list_description.substr (device_list_description.find (".") + 1);
356 return EncryptedKDM (
360 _keys.front().cpl_id (),