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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,111 @@ | ||
| // Copyright 2024 Apple Inc. and the Swift Homomorphic Encryption project authors | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| import Foundation | ||
| import HomomorphicEncryption | ||
| import PrivateInformationRetrieval | ||
| import PrivateInformationRetrievalProtobuf | ||
| import SwiftProtobuf | ||
|
|
||
| extension PIRClient { | ||
| mutating func fetchKeyStatus(for usecase: String) async throws | ||
| -> Apple_SwiftHomomorphicEncryption_Api_Shared_V1_KeyStatus | ||
| { | ||
| let configRequest = Apple_SwiftHomomorphicEncryption_Api_Pir_V1_ConfigRequest.with { configRequest in | ||
| configRequest.usecases = [usecase] | ||
| configRequest.existingConfigIds = [configCache[usecase]?.configurationId ?? Data()] | ||
| } | ||
|
|
||
| let configResponse: Apple_SwiftHomomorphicEncryption_Api_Pir_V1_ConfigResponse = try await post( | ||
| path: "/config", | ||
| body: configRequest) | ||
| guard let config = configResponse.configs[usecase] else { | ||
| throw PIRClientError.missingConfiguration | ||
| } | ||
| configCache[usecase] = Configuration(config: config.pirConfig, configurationId: config.configID) | ||
|
|
||
| guard let keyStatus = configResponse.keyInfo.first else { | ||
| throw PIRClientError.missingKeyStatus | ||
| } | ||
| return keyStatus | ||
| } | ||
|
|
||
| mutating func rotateKey(for usecase: String) async throws { | ||
| let keyStatus = try await fetchKeyStatus(for: usecase) | ||
| guard let config = configCache[usecase]?.config else { | ||
| throw PIRClientError.missingConfiguration | ||
| } | ||
|
|
||
| if let storedSecretKey = secretKeys[config.evaluationKeyConfigHash], | ||
| storedSecretKey.timestamp == keyStatus.timestamp | ||
| { | ||
| // we do not need to rotate | ||
| return | ||
| } | ||
|
|
||
| let context = try Context<PIRClient.Scheme>(encryptionParameters: config.encryptionParameters.native()) | ||
| let secretKey = try context.generateSecretKey() | ||
| let storedSecretKey = StoredSecretKey(secretKey: secretKey.serialize()) | ||
| let evaluationKey = try context.generateEvaluationKey(config: keyStatus.keyConfig.native(), using: secretKey) | ||
| secretKeys[config.evaluationKeyConfigHash] = storedSecretKey | ||
|
|
||
| let evaluationKeyWithMetadata = Apple_SwiftHomomorphicEncryption_Api_Shared_V1_EvaluationKey.with { evalKey in | ||
| evalKey.metadata = .with { metadata in | ||
| metadata.timestamp = storedSecretKey.timestamp | ||
| metadata.identifier = config.evaluationKeyConfigHash | ||
| } | ||
| evalKey.evaluationKey = evaluationKey.serialize().proto() | ||
| } | ||
|
|
||
| try await uploadKey(evaluationKeyWithMetadata) | ||
| } | ||
|
|
||
| mutating func uploadKey(_ key: Apple_SwiftHomomorphicEncryption_Api_Shared_V1_EvaluationKey) async throws { | ||
| let keys = Apple_SwiftHomomorphicEncryption_Api_Shared_V1_EvaluationKeys.with { keyRequest in | ||
| keyRequest.keys = [key] | ||
| } | ||
|
|
||
| let _: EmptyProtobufMessage = try await post(path: "/key", body: keys) | ||
| } | ||
| } | ||
|
|
||
| /// Empty message | ||
| private struct EmptyProtobufMessage: Message { | ||
| static let protoMessageName = "Empty" | ||
|
|
||
| var unknownFields = SwiftProtobuf.UnknownStorage() | ||
|
|
||
| static func == (lhs: EmptyProtobufMessage, rhs: EmptyProtobufMessage) -> Bool { | ||
| if lhs.unknownFields != rhs.unknownFields { | ||
| return false | ||
| } | ||
| return true | ||
| } | ||
|
|
||
| mutating func decodeMessage(decoder: inout some SwiftProtobuf.Decoder) throws { | ||
| // Load everything into unknown fields | ||
| while try decoder.nextFieldNumber() != nil {} | ||
| } | ||
|
|
||
| func traverse(visitor: inout some SwiftProtobuf.Visitor) throws { | ||
| try unknownFields.traverse(visitor: &visitor) | ||
| } | ||
|
|
||
| func isEqualTo(message: any SwiftProtobuf.Message) -> Bool { | ||
| guard let other = message as? EmptyProtobufMessage else { | ||
| return false | ||
| } | ||
| return self == other | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,90 @@ | ||
| // Copyright 2024 Apple Inc. and the Swift Homomorphic Encryption project authors | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| import Foundation | ||
| import PrivacyPass | ||
|
|
||
| extension PIRClient { | ||
| func fetchTokenDirectory() async throws -> TokenIssuerDirectory { | ||
| let response = try await connection.get( | ||
| path: "/.well-known/private-token-issuer-directory", | ||
| body: [], | ||
| headers: [:]) | ||
|
|
||
| let body = Data(buffer: response.body) | ||
| guard response.status == .ok else { | ||
| throw PIRClientError.failedToFetchTokenIssuerDirectory( | ||
| status: response.status, | ||
| message: String(data: body, encoding: .utf8) ?? "<\(body.count) bytes of binary response>") | ||
| } | ||
| return try JSONDecoder().decode(TokenIssuerDirectory.self, from: body) | ||
| } | ||
|
|
||
| func fetchPublicKeyForUserToken(authenticationToken: String) async throws -> PublicKey { | ||
| let response = try await connection.get( | ||
| path: "/token-key-for-user-token", | ||
| body: [], | ||
| headers: [.authorization: "Bearer \(authenticationToken)"]) | ||
|
|
||
| let body = Array(buffer: response.body) | ||
| guard response.status == .ok else { | ||
| throw PIRClientError.failedToFetchTokenPublicKey( | ||
| status: response.status, | ||
| message: String(data: Data(body), encoding: .utf8) ?? "<\(body.count) bytes of binary response>") | ||
| } | ||
|
|
||
| return try PublicKey(fromSPKI: body) | ||
| } | ||
|
|
||
| mutating func fetchTokens(count: Int) async throws { | ||
| guard let userToken else { | ||
| throw PIRClientError.missingAuthenticationToken | ||
| } | ||
|
|
||
| let tokenIssuerDirectory = try await fetchTokenDirectory() | ||
| let publicKey = try await fetchPublicKeyForUserToken(authenticationToken: userToken) | ||
|
|
||
| guard try tokenIssuerDirectory.isValid(tokenKey: publicKey.spki()) else { | ||
| throw PIRClientError.invalidTokenIssuerPublicKey | ||
| } | ||
|
|
||
| let connection = connection | ||
| let challenge = try TokenChallenge(tokenType: TokenTypeBlindRSA, issuer: "test") | ||
|
|
||
| try await withThrowingTaskGroup(of: Token.self) { group in | ||
| for _ in 0..<count { | ||
| group.addTask { | ||
| let preparedRequest = try publicKey.request(challenge: challenge.bytes()) | ||
| let response = try await connection.post( | ||
| path: "/issue", | ||
| body: preparedRequest.tokenRequest.bytes(), | ||
| headers: [.authorization: "Bearer \(userToken)"]) | ||
| let body = Array(buffer: response.body) | ||
| guard response.status == .ok else { | ||
| throw PIRClientError.failedToFetchToken( | ||
| status: response.status, | ||
| message: String(data: Data(body), encoding: .utf8) ?? | ||
| "<\(body.count) bytes of binary response>") | ||
| } | ||
| let tokenResponse = try TokenResponse(from: body) | ||
| return try preparedRequest.finalize(response: tokenResponse) | ||
| } | ||
| } | ||
|
|
||
| for try await token in group { | ||
| tokens.append(token) | ||
| } | ||
| } | ||
| } | ||
| } |
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