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// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file
syntax = "proto2";
option optimize_for = LITE_RUNTIME;
package crx_file;
// A CRX₃ file is a binary file of the following format:
// [4 octets]: "Cr24", a magic number.
// [4 octets]: The version of the *.crx file format used (currently 3).
// [4 octets]: N, little-endian, the length of the header section.
// [N octets]: The header (the binary encoding of a CrxFileHeader).
// [M octets]: The ZIP archive.
// Clients should reject CRX₃ files that contain an N that is too large for the
// client to safely handle in memory.
message CrxFileHeader {
// PSS signature with RSA public key. The public key is formatted as a
// X.509 SubjectPublicKeyInfo block, as in CRX₂. In the common case of a
// developer key proof, the first 128 bits of the SHA-256 hash of the
// public key must equal the crx_id.
repeated AsymmetricKeyProof sha256_with_rsa = 2;
// ECDSA signature, using the NIST P-256 curve. Public key appears in
// named-curve format.
// The pinned algorithm will be this, at least on 2017-01-01.
repeated AsymmetricKeyProof sha256_with_ecdsa = 3;
// The binary form of a SignedData message. We do not use a nested
// SignedData message, as handlers of this message must verify the proofs
// on exactly these bytes, so it is convenient to parse in two steps.
// All proofs in this CrxFile message are on the value
// "CRX3 SignedData\x00" + signed_header_size + signed_header_data +
// archive, where "\x00" indicates an octet with value 0, "CRX3 SignedData"
// is encoded using UTF-8, signed_header_size is the size in octets of the
// contents of this field and is encoded using 4 octets in little-endian
// order, signed_header_data is exactly the content of this field, and
// archive is the remaining contents of the file following the header.
optional bytes signed_header_data = 10000;
message AsymmetricKeyProof {
optional bytes public_key = 1;
optional bytes signature = 2;
message SignedData {
// This is simple binary, not UTF-8 encoded mpdecimal; i.e. it is exactly
// 16 bytes long.
optional bytes crx_id = 1;