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Strip padding from entitlement keys.

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Merge from Widevine repo of http://go/wvgerrit/47540

Bug: 77364593
Test: tested as part of http://go/ag/4674759

Change-Id: If1063d410153eb49584c94156e2d98af9e08c060
This commit is contained in:
Fred Gylys-Colwell
2018-07-01 17:59:29 -07:00
parent fc4186e4fd
commit d5bb64a60c
1 changed files with 9 additions and 1 deletions
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10
libwvdrmengine/cdm/core/src/license.cpp
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@@ -80,9 +80,17 @@ static std::vector<CryptoKey> ExtractEntitlementKeys(const License& license) {
// Extract sub session key(s)
for (int i = 0; i < license.key_size(); ++i) {
CryptoKey key;
size_t length = 0;
switch (license.key(i).type()) {
case License_KeyContainer::ENTITLEMENT: {
key.set_key_data(license.key(i).key());
// Strip off PKCS#5 padding - since we know the key is 32 or 48 bytes,
// the padding will always be 16 bytes.
if (license.key(i).key().size() > 32) {
length = license.key(i).key().size() - 16;
} else {
length = 0;
}
key.set_key_data(license.key(i).key().substr(0, length));
key.set_key_data_iv(license.key(i).iv());
key.set_key_id(license.key(i).id());
key.set_track_label(license.key(i).track_label());