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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
syntax = "proto3";
package ip_protection;
option optimize_for = LITE_RUNTIME;
message GetProbabilisticRevealTokenRequest {
enum ServiceType {
SERVICE_TYPE_UNSPECIFIED = 0;
CHROME = 1;
}
optional ServiceType service_type = 1;
}
message Timestamp {
// Represents seconds of UTC time since Unix epoch
// 1970-01-01T00:00:00Z. Must be from 0001-01-01T00:00:00Z to
// 9999-12-31T23:59:59Z inclusive.
int64 seconds = 1;
// Non-negative fractions of a second at nanosecond resolution. Negative
// second values with fractions must still have non-negative nanos values
// that count forward in time. Must be from 0 to 999,999,999
// inclusive.
int32 nanos = 2;
}
// Response to get probabilistic reveal tokens.
message GetProbabilisticRevealTokenResponse {
// A single probabilistic reveal token
message ProbabilisticRevealToken {
// Version 1 indicates curve secp224r1.
// Chrome verifies version is 1 and complains if not.
optional int32 version = 1;
// Elliptic curve point stored in compressed form, for version 1 size must
// be 29.
optional bytes u = 2;
// Elliptic curve point stored in compressed form, for version 1 size must
// be 29.
optional bytes e = 3;
}
// Stores a public key for curve secp224r1.
message PublicKey {
// Elliptic curve point stored in compressed form, for version 1 size must
// be 29.
optional bytes y = 1;
}
repeated ProbabilisticRevealToken tokens = 1;
optional PublicKey public_key = 2;
// Time since unix epoch, tokens are invalid past this expiration time.
optional Timestamp expiration_time = 3;
// Time since unix epoch. After this, chrome can ask for tokens with a later
// expiration time.
optional Timestamp next_epoch_start_time = 4;
// The number of tokens with the signal.
optional int32 num_tokens_with_signal = 5;
// The id of the epoch in which the tokens were issued, used to identify the
// corresponding key used to decrypt the tokens.
optional bytes epoch_id = 6;
}
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