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-rw-r--r--src/cli/dsa_sign.cpp85
1 files changed, 85 insertions, 0 deletions
diff --git a/src/cli/dsa_sign.cpp b/src/cli/dsa_sign.cpp
new file mode 100644
index 000000000..03aede585
--- /dev/null
+++ b/src/cli/dsa_sign.cpp
@@ -0,0 +1,85 @@
+/*
+* (C) 2014,2015 Jack Lloyd
+*
+* Botan is released under the Simplified BSD License (see license.txt)
+*/
+
+#include "apps.h"
+
+#if defined(BOTAN_HAS_DSA)
+
+#include <botan/dsa.h>
+#include <botan/pubkey.h>
+#include <botan/pkcs8.h>
+#include <botan/base64.h>
+#include <fstream>
+
+namespace {
+
+int dsa_sign(const std::vector<std::string> &args)
+ {
+ using namespace Botan;
+
+ const std::string SUFFIX = ".sig";
+
+ if(args.size() != 4)
+ {
+ std::cout << "Usage: " << args[0] << " keyfile messagefile passphrase"
+ << std::endl;
+ return 1;
+ }
+
+ try {
+ std::string passphrase(args[3]);
+
+ std::ifstream message(args[2], std::ios::binary);
+ if(!message)
+ {
+ std::cout << "Couldn't read the message file." << std::endl;
+ return 1;
+ }
+
+ std::string outfile = args[2] + SUFFIX;
+ std::ofstream sigfile(outfile);
+ if(!sigfile)
+ {
+ std::cout << "Couldn't write the signature to "
+ << outfile << std::endl;
+ return 1;
+ }
+
+ AutoSeeded_RNG rng;
+
+ std::unique_ptr<PKCS8_PrivateKey> key(
+ PKCS8::load_key(args[1], rng, passphrase)
+ );
+
+ DSA_PrivateKey* dsakey = dynamic_cast<DSA_PrivateKey*>(key.get());
+
+ if(!dsakey)
+ {
+ std::cout << "The loaded key is not a DSA key!" << std::endl;
+ return 1;
+ }
+
+ PK_Signer signer(*dsakey, "EMSA1(SHA-1)");
+
+ DataSource_Stream in(message);
+ byte buf[4096] = { 0 };
+ while(size_t got = in.read(buf, sizeof(buf)))
+ signer.update(buf, got);
+
+ sigfile << base64_encode(signer.signature(rng)) << std::endl;
+ }
+ catch(std::exception& e)
+ {
+ std::cout << "Exception caught: " << e.what() << std::endl;
+ }
+ return 0;
+ }
+
+REGISTER_APP(dsa_sign);
+
+}
+
+#endif