blob: 23d87c27aa1b5a1d3b060d98618be87651fa7893 [file] [log] [blame]
/*
* Copyright (C) 2021 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#import "config.h"
#import "PrivateClickMeasurement.h"
#import <pal/cocoa/CryptoKitPrivateSoftLink.h>
namespace WebCore {
std::optional<String> PrivateClickMeasurement::calculateAndUpdateSourceUnlinkableToken(const String& serverPublicKeyBase64URL)
{
#if HAVE(RSA_BSSA)
{
auto serverPublicKeyData = base64URLDecode(serverPublicKeyBase64URL);
if (!serverPublicKeyData)
return "Could not decode the source's public key data."_s;
auto serverPublicKey = adoptNS([[NSData alloc] initWithBytes:serverPublicKeyData->data() length:serverPublicKeyData->size()]);
NSError* nsError = 0;
m_sourceUnlinkableToken.blinder = adoptNS([PAL::allocRSABSSATokenBlinderInstance() initWithPublicKey:serverPublicKey.get() error:&nsError]);
if (nsError)
return nsError.localizedDescription;
if (!m_sourceUnlinkableToken.blinder)
return "Did not get a source unlinkable token blinder."_s;
}
NSError* nsError = 0;
m_sourceUnlinkableToken.waitingToken = [m_sourceUnlinkableToken.blinder tokenWaitingActivationWithContent:nullptr error:&nsError];
if (nsError)
return nsError.localizedDescription;
if (!m_sourceUnlinkableToken.waitingToken)
return "Did not get a source unlinkable token waiting token."_s;
m_sourceUnlinkableToken.valueBase64URL = base64URLEncodeToString([m_sourceUnlinkableToken.waitingToken blindedMessage].bytes, [m_sourceUnlinkableToken.waitingToken blindedMessage].length);
return std::nullopt;
#else
UNUSED_PARAM(serverPublicKeyBase64URL);
return "Unlinkable tokens are not supported by this platform."_s;
#endif // HAVE(RSA_BSSA)
}
std::optional<String> PrivateClickMeasurement::calculateAndUpdateSourceSecretToken(const String& serverResponseBase64URL)
{
#if HAVE(RSA_BSSA)
if (!m_sourceUnlinkableToken.waitingToken)
return "Did not find a source unlinkable token waiting token."_s;
{
auto serverResponseData = base64URLDecode(serverResponseBase64URL);
if (!serverResponseData)
return "Could not decode source response data."_s;
auto serverResponse = adoptNS([[NSData alloc] initWithBytes:serverResponseData->data() length:serverResponseData->size()]);
NSError* nsError = 0;
m_sourceUnlinkableToken.readyToken = [m_sourceUnlinkableToken.waitingToken activateTokenWithServerResponse:serverResponse.get() error:&nsError];
if (nsError)
return nsError.localizedDescription;
if (!m_sourceUnlinkableToken.readyToken)
return "Did not get a source unlinkable token ready token."_s;
}
SourceSecretToken token;
token.tokenBase64URL = base64URLEncodeToString([m_sourceUnlinkableToken.readyToken tokenContent].bytes, [m_sourceUnlinkableToken.readyToken tokenContent].length);
token.keyIDBase64URL = base64URLEncodeToString([m_sourceUnlinkableToken.readyToken keyId].bytes, [m_sourceUnlinkableToken.readyToken keyId].length);
token.signatureBase64URL = base64URLEncodeToString([m_sourceUnlinkableToken.readyToken signature].bytes, [m_sourceUnlinkableToken.readyToken signature].length);
m_sourceSecretToken = WTFMove(token);
return std::nullopt;
#else
UNUSED_PARAM(serverResponseBase64URL);
return "Unlinkable tokens are not supported by this platform."_s;
#endif // HAVE(RSA_BSSA)
}
} // namespace WebCore