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Don't add offsets to ion handles

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Fixes a secure buffer addressing offset error in the Widevine
CENC drm engine.

bug: 8667527

Merges the following from Widevine CDM repository:

Allow specification of offset into secure buffer
https://widevine-internal-review.googlesource.com/#/c/5100/

Update WVCryptoPlugin to Pass Output Offset as a Separate Parameter
https://widevine-internal-review.googlesource.com/#/c/5120/

Add offset to secure data buffer in OEMCrypto DecryptCTR
https://widevine-internal-review.googlesource.com/#/c/5110/

Change-Id: Ic3e4b35304c8fbae4aebe4c495285eb787e8c205
This commit is contained in:
Jeff Tinker
2013-04-19 16:40:38 -07:00
parent 87c3f5652f
commit d29372909d
15 changed files with 62 additions and 40 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
libwvdrmengine/oemcrypto/mock/src/oemcrypto_engine_mock.cpp
View File

@@ -856,7 +856,7 @@ bool CryptoEngine::DecryptMessage(SessionContext* session,
bool CryptoEngine::DecryptCTR(SessionContext* session,
const uint8_t* iv,
size_t byte_offset,
size_t block_offset,
const uint8_t* cipher_data,
size_t cipher_data_length,
bool is_encrypted,
@@ -922,18 +922,18 @@ bool CryptoEngine::DecryptCTR(SessionContext* session,
// Encrypt the IV.
uint8_t ecount_buf[AES_BLOCK_SIZE];
if (byte_offset != 0) {
if (block_offset != 0) {
// The context is needed only when not starting a new block.
AES_encrypt(aes_iv, ecount_buf, &aes_key);
ctr128_inc(aes_iv);
}
// Decryption.
unsigned int byte_offset_cur = byte_offset;
unsigned int block_offset_cur = block_offset;
AES_ctr128_encrypt(
cipher_data, reinterpret_cast<uint8_t*>(clear_data), cipher_data_length,
&aes_key, aes_iv, ecount_buf, &byte_offset_cur);
if (byte_offset_cur != ((byte_offset + cipher_data_length) % AES_BLOCK_SIZE)) {
&aes_key, aes_iv, ecount_buf, &block_offset_cur);
if (block_offset_cur != ((block_offset + cipher_data_length) % AES_BLOCK_SIZE)) {
LOGE("[DecryptCTR(): FAILURE: byte offset wrong.]");
return false;
}