diff options
Diffstat (limited to 'src/cli/dsa_sign.cpp')
-rw-r--r-- | src/cli/dsa_sign.cpp | 85 |
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 |