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Add backward compatibility to OEMCrypto_CopyBuffer

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Merge from Widevine repository of http://go/wvgerrit/13912

This CL falls back to OEMCrypto_DecryptCTR if the oemcrypto library
does not implement OEMCrypto_CopyBuffer.  This allows devices with
oem crypto version 9 to function as they previously did.

Change-Id: Id3a4a94b1fd559f426ee260cfbf7077fa9101d8b
This commit is contained in:
Fred Gylys-Colwell
2015-03-31 15:09:45 -07:00
parent a7d2f57bfb
commit ae1711acc0
3 changed files with 24 additions and 18 deletions
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25
libwvdrmengine/cdm/core/src/crypto_session.cpp
View File

@@ -660,25 +660,28 @@ CdmResponseType CryptoSession::Decrypt(const CdmDecryptionParameters& params) {
break; break;
} }
OEMCryptoResult sts; OEMCryptoResult sts = OEMCrypto_ERROR_NOT_IMPLEMENTED;
if (params.is_encrypted) { if (!params.is_encrypted) {
sts = OEMCrypto_CopyBuffer(requested_security_level_,
params.encrypt_buffer, params.encrypt_length,
&buffer_descriptor, params.subsample_flags);
}
if (params.is_encrypted || sts == OEMCrypto_ERROR_NOT_IMPLEMENTED) {
AutoLock auto_lock(crypto_lock_); AutoLock auto_lock(crypto_lock_);
// Check if key needs to be selected // Check if key needs to be selected
if (key_id_ != *params.key_id) { if (params.is_encrypted) {
if (SelectKey(*params.key_id)) { if (key_id_ != *params.key_id) {
key_id_ = *params.key_id; if (SelectKey(*params.key_id)) {
} else { key_id_ = *params.key_id;
return NEED_KEY; } else {
return NEED_KEY;
}
} }
} }
sts = OEMCrypto_DecryptCTR( sts = OEMCrypto_DecryptCTR(
oec_session_id_, params.encrypt_buffer, params.encrypt_length, oec_session_id_, params.encrypt_buffer, params.encrypt_length,
params.is_encrypted, &(*params.iv).front(), params.block_offset, params.is_encrypted, &(*params.iv).front(), params.block_offset,
&buffer_descriptor, params.subsample_flags); &buffer_descriptor, params.subsample_flags);
} else {
sts = OEMCrypto_CopyBuffer(requested_security_level_,
params.encrypt_buffer, params.encrypt_length,
&buffer_descriptor, params.subsample_flags);
} }
switch (sts) { switch (sts) {

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

@@ -1068,10 +1068,12 @@ OEMCryptoResult SessionContext::DecryptCTR(
OEMCryptoBufferType buffer_type) { OEMCryptoBufferType buffer_type) {
// If the data is clear, we do not need a current key selected. // If the data is clear, we do not need a current key selected.
if (!is_encrypted) { if (!is_encrypted) {
if (buffer_type == OEMCrypto_BufferType_Direct) if (buffer_type != OEMCrypto_BufferType_Direct){
return OEMCrypto_ERROR_NOT_IMPLEMENTED; memcpy(reinterpret_cast<uint8_t*>(clear_data), cipher_data,
memcpy(reinterpret_cast<uint8_t*>(clear_data), cipher_data, cipher_data_length);
cipher_data_length); return OEMCrypto_SUCCESS;
}
// For reference implementation, we quietly drop the clear direct video.
return OEMCrypto_SUCCESS; return OEMCrypto_SUCCESS;
} }

7
libwvdrmengine/oemcrypto/mock/src/oemcrypto_mock.cpp
View File

@@ -536,10 +536,11 @@ OEMCryptoResult SetDestination(OEMCrypto_DestBufferDesc* out_buffer,
+ out_buffer->buffer.secure.offset; + out_buffer->buffer.secure.offset;
*max_length = out_buffer->buffer.secure.max_length; *max_length = out_buffer->buffer.secure.max_length;
break; break;
default:
case OEMCrypto_BufferType_Direct: case OEMCrypto_BufferType_Direct:
return OEMCrypto_ERROR_NOT_IMPLEMENTED; *destination = NULL;
break; break;
default:
return OEMCrypto_ERROR_INVALID_CONTEXT;
} }
if (out_buffer->type != OEMCrypto_BufferType_Direct if (out_buffer->type != OEMCrypto_BufferType_Direct
@@ -616,7 +617,7 @@ OEMCryptoResult OEMCrypto_CopyBuffer(const uint8_t *data_addr,
&max_length); &max_length);
if (sts != OEMCrypto_SUCCESS) return sts; if (sts != OEMCrypto_SUCCESS) return sts;
memcpy(destination, data_addr, data_length); if (destination != NULL) memcpy(destination, data_addr, data_length);
return OEMCrypto_SUCCESS; return OEMCrypto_SUCCESS;
} }