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Exposing the Cast Signing Algorithm

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[ Merge of http://go/wvgerrit/178076 ]

1. Exposing the Cast Signing Algorithm in cdm core.
2. Update core Cast tests to use new core CDM Cast signing API.

Bug: 279671867
Bug: 279672538
Test: com.google.android.wvts
Change-Id: Ia73c4b5e6dd61edf790bca97a321881d310e7a99
(cherry picked from commit 8996b624d73adf14db45e54653e7ddc513f3895c)
This commit is contained in:
Kyle Zhang
2023-04-27 19:12:09 +00:00
parent d655ffbfe7
commit bd389027a1
10 changed files with 108 additions and 60 deletions
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44
libwvdrmengine/cdm/core/src/cdm_engine.cpp
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@@ -2340,4 +2340,48 @@ void CdmEngine::SetFastOtaKeyboxFallbackDurationRules() {
}
system_fallback_policy->SetFastBackoffDurationRules();
}
CdmResponseType CdmEngine::SignRSA(const std::string& wrapped_key,
const std::string& message,
std::string* signature,
RSA_Padding_Scheme padding_scheme) {
// Try to open cdm session.
CdmSessionId session_id;
auto sts = OpenSession("com.widevine", nullptr, nullptr, &session_id);
if (sts != NO_ERROR) {
LOGE("OpenSession failed, status: %d", static_cast<int>(sts));
return sts;
}
// Retrieve the cdm session
std::shared_ptr<CdmSession> session;
if (!session_map_.FindSession(session_id, &session)) {
LOGE("Session not found: session_id = %s", IdToString(session_id));
return CdmResponseType(SESSION_NOT_FOUND_24);
}
// Load cast private key for signing
CryptoWrappedKey key(CryptoWrappedKey::kRsa, wrapped_key);
sts = session->LoadCastPrivateKey(key);
if (sts != NO_ERROR) {
LOGE("LoadCastPrivateKey failed, status: %d", static_cast<int>(sts));
return sts;
}
// Generate Rsa signature for cast message
sts = session->GenerateRSASignature(message, signature, padding_scheme);
if (sts != NO_ERROR) {
LOGE("GenerateRSASignature failed, status: %d", static_cast<int>(sts));
return sts;
}
// Try to close cdm session.
sts = CloseSession(session_id);
if (sts != NO_ERROR) {
LOGE("CloseSession failed, status: %d", static_cast<int>(sts));
return sts;
}
return sts;
}
} // namespace wvcdm