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/*
* (C) 2016 René Korthaus, Rohde & Schwarz Cybersecurity
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include "tests.h"
#if defined(BOTAN_HAS_CIPHER_MODE_PADDING)
#include <botan/mode_pad.h>
#endif
namespace Botan_Tests {
#if defined(BOTAN_HAS_CIPHER_MODE_PADDING)
class Cipher_Mode_Padding_Tests : public Text_Based_Test
{
public:
Cipher_Mode_Padding_Tests() :
Text_Based_Test("", "pad.vec", {"In", "Blocksize"},{"Out"})
{}
Test::Result run_one_test(const std::string& header, const VarMap& vars) override
{
const std::vector<uint8_t> input = get_req_bin(vars, "In");
const std::vector<uint8_t> expected = get_opt_bin(vars, "Out");
const size_t block_size = get_req_sz(vars, "Blocksize");
std::string algo = header;
auto underscore = algo.find('_');
if(underscore != std::string::npos)
{
if(algo.substr(underscore+1,std::string::npos) != "Invalid")
throw Test_Error("Unexpected padding header " + header);
algo = algo.substr(0, underscore);
}
Test::Result result(algo);
std::unique_ptr<Botan::BlockCipherModePaddingMethod> pad(Botan::get_bc_pad(algo));
if(!pad)
{
result.test_failure("Invalid padding method: " + algo);
return result;
}
if(expected.empty())
{
// This is an unpad an invalid input and ensure we reject
try
{
pad->unpad(input.data(), block_size);
result.test_failure("Did not reject invalid padding", Botan::hex_encode(input));
}
catch(Botan::Decoding_Error&)
{
result.test_success("Rejected invalid padding");
}
}
else
{
// This is a pad plaintext and unpad valid padding round trip test
Botan::secure_vector<uint8_t> buf(input.begin(), input.end());
pad->add_padding(buf, input.size() % block_size, block_size);
result.test_eq("pad", buf, expected);
buf.assign(expected.begin(), expected.end());
const size_t last_block = ( buf.size() < block_size ) ? 0 : buf.size() - block_size;
const size_t pad_bytes = block_size - pad->unpad(&buf[last_block], block_size);
buf.resize(buf.size() - pad_bytes); // remove padding
result.test_eq("unpad", buf, input);
}
return result;
}
};
BOTAN_REGISTER_TEST("bc_pad", Cipher_Mode_Padding_Tests);
#endif
}
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