mirror of
https://github.com/moparisthebest/mailiverse
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86 lines
1.8 KiB
C++
86 lines
1.8 KiB
C++
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#include <iostream>
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#include <iomanip>
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#include <fstream>
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#include <cstdlib>
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#include <string>
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#include <memory>
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#include <botan/botan.h>
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#include <botan/pubkey.h>
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#include <botan/dsa.h>
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using namespace Botan;
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namespace {
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SecureVector<byte> b64_decode(const std::string& in)
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{
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Pipe pipe(new Base64_Decoder);
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pipe.process_msg(in);
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return pipe.read_all();
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}
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}
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int main(int argc, char* argv[])
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{
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if(argc != 4)
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{
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std::cout << "Usage: " << argv[0]
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<< " keyfile messagefile sigfile" << std::endl;
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return 1;
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}
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try {
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Botan::LibraryInitializer init;
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std::ifstream message(argv[2], std::ios::binary);
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if(!message)
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{
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std::cout << "Couldn't read the message file." << std::endl;
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return 1;
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}
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std::ifstream sigfile(argv[3]);
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if(!sigfile)
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{
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std::cout << "Couldn't read the signature file." << std::endl;
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return 1;
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}
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std::string sigstr;
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getline(sigfile, sigstr);
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std::auto_ptr<X509_PublicKey> key(X509::load_key(argv[1]));
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DSA_PublicKey* dsakey = dynamic_cast<DSA_PublicKey*>(key.get());
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if(!dsakey)
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{
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std::cout << "The loaded key is not a DSA key!\n";
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return 1;
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}
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SecureVector<byte> sig = b64_decode(sigstr);
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PK_Verifier ver(*dsakey, "EMSA1(SHA-1)");
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DataSource_Stream in(message);
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byte buf[4096] = { 0 };
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while(size_t got = in.read(buf, sizeof(buf)))
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ver.update(buf, got);
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const bool ok = ver.check_signature(sig);
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if(ok)
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std::cout << "Signature verified\n";
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else
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std::cout << "Signature did NOT verify\n";
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}
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catch(std::exception& e)
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{
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std::cout << "Exception caught: " << e.what() << std::endl;
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return 1;
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}
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return 0;
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}
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