diff options
Diffstat (limited to 'src/apps/dsa_sign.cpp')
-rw-r--r-- | src/apps/dsa_sign.cpp | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/src/apps/dsa_sign.cpp b/src/apps/dsa_sign.cpp new file mode 100644 index 000000000..31aaf7aeb --- /dev/null +++ b/src/apps/dsa_sign.cpp @@ -0,0 +1,71 @@ +#include "apps.h" +#include <iostream> +#include <iomanip> +#include <fstream> +#include <string> +#include <memory> + +#include <botan/pubkey.h> +#include <botan/dsa.h> +#include <botan/base64.h> +using namespace Botan; + +const std::string SUFFIX = ".sig"; + +int dsa_sign(int argc, char* argv[]) + { + if(argc != 4) + { + std::cout << "Usage: " << argv[0] << " keyfile messagefile passphrase" + << std::endl; + return 1; + } + + try { + std::string passphrase(argv[3]); + + std::ifstream message(argv[2], std::ios::binary); + if(!message) + { + std::cout << "Couldn't read the message file." << std::endl; + return 1; + } + + std::string outfile = argv[2] + SUFFIX; + std::ofstream sigfile(outfile.c_str()); + if(!sigfile) + { + std::cout << "Couldn't write the signature to " + << outfile << std::endl; + return 1; + } + + AutoSeeded_RNG rng; + + std::auto_ptr<PKCS8_PrivateKey> key( + PKCS8::load_key(argv[1], rng, passphrase) + ); + + DSA_PrivateKey* dsakey = dynamic_cast<DSA_PrivateKey*>(key.get()); + + if(!dsakey) + { + std::cout << "The loaded key is not a DSA key!\n"; + 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)) << "\n"; + } + catch(std::exception& e) + { + std::cout << "Exception caught: " << e.what() << std::endl; + } + return 0; + } |