Add a command in delta_generator to calculate the maximum signature size am: 9cad266457
am: bc642e1586
Change-Id: I53326672e8748b385581a53b644787af5b0e5010
diff --git a/payload_generator/generate_delta_main.cc b/payload_generator/generate_delta_main.cc
index 1323534..f035ff1 100644
--- a/payload_generator/generate_delta_main.cc
+++ b/payload_generator/generate_delta_main.cc
@@ -423,6 +423,10 @@
DEFINE_bool(disable_fec_computation,
false,
"Disables the fec data computation on device.");
+ DEFINE_string(
+ out_maximum_signature_size_file,
+ "",
+ "Path to the output maximum signature size given a private key.");
brillo::FlagHelper::Init(
argc,
@@ -444,6 +448,30 @@
// Initialize the Xz compressor.
XzCompressInit();
+ if (!FLAGS_out_maximum_signature_size_file.empty()) {
+ LOG_IF(FATAL, FLAGS_private_key.empty())
+ << "Private key is not provided when calculating the maximum signature "
+ "size.";
+
+ size_t maximum_signature_size;
+ if (!PayloadSigner::GetMaximumSignatureSize(FLAGS_private_key,
+ &maximum_signature_size)) {
+ LOG(ERROR) << "Failed to get the maximum signature size of private key: "
+ << FLAGS_private_key;
+ return 1;
+ }
+ // Write the size string to output file.
+ string signature_size_string = std::to_string(maximum_signature_size);
+ if (!utils::WriteFile(FLAGS_out_maximum_signature_size_file.c_str(),
+ signature_size_string.c_str(),
+ signature_size_string.size())) {
+ PLOG(ERROR) << "Failed to write the maximum signature size to "
+ << FLAGS_out_maximum_signature_size_file << ".";
+ return 1;
+ }
+ return 0;
+ }
+
vector<size_t> signature_sizes;
if (!FLAGS_signature_size.empty()) {
ParseSignatureSizes(FLAGS_signature_size, &signature_sizes);