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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;
- // A verified contents file containing signatures over the archive contents.
- // The verified contents are encoded in UTF-8 and then GZIP-compressed.
- // Consult
- // https://source.chromium.org/chromium/chromium/src/+/main:extensions/browser/verified_contents.h
- // for information about the verified contents format.
- optional bytes verified_contents = 4;
- // 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;
- }
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