1 files changed, 78 insertions, 0 deletions
diff --git a/comm/third_party/botan/src/cli/hash.cpp b/comm/third_party/botan/src/cli/hash.cpp
new file mode 100644
index 0000000000..8e59b2ab56
--- /dev/null
+++ b/comm/third_party/botan/src/cli/hash.cpp
@@ -0,0 +1,78 @@
+/*
+* (C) 2009,2010,2014,2015,2019 Jack Lloyd
+*
+* Botan is released under the Simplified BSD License (see license.txt)
+*/
+
+#include "cli.h"
+
+#if defined(BOTAN_HAS_HASH)
+   #include <botan/hash.h>
+#endif
+
+namespace Botan_CLI {
+
+#if defined(BOTAN_HAS_HASH)
+
+class Hash final : public Command
+   {
+   public:
+      Hash() : Command("hash --algo=SHA-256 --buf-size=4096 --no-fsname --format=hex *files") {}
+
+      std::string group() const override
+         {
+         return "hash";
+         }
+
+      std::string description() const override
+         {
+         return "Compute the message digest of given file(s)";
+         }
+
+      void go() override
+         {
+         const std::string hash_algo = get_arg("algo");
+         const std::string format = get_arg("format");
+         const size_t buf_size = get_arg_sz("buf-size");
+         const bool no_fsname = flag_set("no-fsname");
+
+         std::unique_ptr<Botan::HashFunction> hash_fn(Botan::HashFunction::create(hash_algo));
+
+         if(!hash_fn)
+            {
+            throw CLI_Error_Unsupported("hashing", hash_algo);
+            }
+
+         std::vector<std::string> files = get_arg_list("files");
+         if(files.empty())
+            {
+            files.push_back("-");
+            } // read stdin if no arguments on command line
+
+         for(const std::string& fsname : files)
+            {
+            try
+               {
+               auto update_hash = [&](const uint8_t b[], size_t l) { hash_fn->update(b, l); };
+               read_file(fsname, update_hash, buf_size);
+
+               const std::string digest = format_blob(format, hash_fn->final());
+
+               if(no_fsname)
+                  output() << digest << "\n";
+               else
+                  output() << digest << " " << fsname << "\n";
+               }
+            catch(CLI_IO_Error& e)
+               {
+               error_output() << e.what() << "\n";
+               }
+            }
+         }
+   };
+
+BOTAN_REGISTER_COMMAND("hash", Hash);
+
+#endif
+
+}