void BundleAuthenticationBlock::auth(dtn::data::Bundle &bundle, const dtn::security::SecurityKey &key)
{
BundleAuthenticationBlock& bab_begin = bundle.push_front<BundleAuthenticationBlock>();
bab_begin.set(dtn::data::Block::DISCARD_IF_NOT_PROCESSED, true);
// set security source
if (!key.reference.sameHost(bundle.source)) bab_begin.setSecuritySource( key.reference );
dtn::data::Number correlator = createCorrelatorValue(bundle);
bab_begin.setCorrelator(correlator);
bab_begin.setCiphersuiteId(BAB_HMAC);
BundleAuthenticationBlock& bab_end = bundle.push_back<BundleAuthenticationBlock>();
bab_end.set(dtn::data::Block::DISCARD_IF_NOT_PROCESSED, true);
bab_end.setCorrelator(correlator);
bab_end._ciphersuite_flags |= CONTAINS_SECURITY_RESULT;
std::string sizehash_hash = calcMAC(bundle, key);
bab_end._security_result.set(SecurityBlock::integrity_signature, sizehash_hash);
}
void PayloadConfidentialBlock::encrypt(dtn::data::Bundle& bundle, const dtn::security::SecurityKey &long_key, const dtn::data::EID& source)
{
// contains the random salt
uint32_t salt;
// contains the random key
unsigned char ephemeral_key[ibrcommon::AES128Stream::key_size_in_bytes];
unsigned char iv[ibrcommon::AES128Stream::iv_len];
unsigned char tag[ibrcommon::AES128Stream::tag_len];
// create a new correlator value
dtn::data::Number correlator = createCorrelatorValue(bundle);
// create a random salt and key
createSaltAndKey(salt, ephemeral_key, ibrcommon::AES128Stream::key_size_in_bytes);
// count all PCBs
dtn::data::Size pcbs_size = std::count(bundle.begin(), bundle.end(), PayloadConfidentialBlock::BLOCK_TYPE);
// count all PIBs
dtn::data::Size pibs_size = std::count(bundle.begin(), bundle.end(), PayloadIntegrityBlock::BLOCK_TYPE);
// encrypt PCBs and PIBs
dtn::data::Bundle::find_iterator find_pcb(bundle.begin(), PayloadConfidentialBlock::BLOCK_TYPE);
while (find_pcb.next(bundle.end()))
{
SecurityBlock::encryptBlock<PayloadConfidentialBlock>(bundle, find_pcb, salt, ephemeral_key).setCorrelator(correlator);
}
dtn::data::Bundle::find_iterator find_pib(bundle.begin(), PayloadIntegrityBlock::BLOCK_TYPE);
while (find_pib.next(bundle.end()))
{
SecurityBlock::encryptBlock<PayloadConfidentialBlock>(bundle, find_pib, salt, ephemeral_key).setCorrelator(correlator);
}
// create a new payload confidential block
PayloadConfidentialBlock& pcb = bundle.push_front<PayloadConfidentialBlock>();
// set the correlator
if (pcbs_size > 0 || pibs_size > 0)
pcb.setCorrelator(correlator);
// get reference to the payload block
dtn::data::PayloadBlock& plb = bundle.find<dtn::data::PayloadBlock>();
ibrcommon::BLOB::Reference blobref = plb.getBLOB();
// encrypt payload - BEGIN
{
ibrcommon::BLOB::iostream stream = blobref.iostream();
ibrcommon::AES128Stream aes_stream(ibrcommon::CipherStream::CIPHER_ENCRYPT, *stream, ephemeral_key, salt);
// encrypt in place
((ibrcommon::CipherStream&)aes_stream).encrypt(*stream);
// check if this is a fragment
if (bundle.get(dtn::data::PrimaryBlock::FRAGMENT))
{
// ... and set the corresponding cipher suit params
addFragmentRange(pcb._ciphersuite_params, bundle.fragmentoffset, stream.size());
}
// get the IV
aes_stream.getIV(iv);
// get the tag
aes_stream.getTag(tag);
}
// encrypt payload - END
// set the source and destination address of the new block
if (source != bundle.source.getNode()) pcb.setSecuritySource( source );
if (long_key.reference != bundle.destination.getNode()) pcb.setSecurityDestination( long_key.reference );
// set replicate in every fragment to true
pcb.set(REPLICATE_IN_EVERY_FRAGMENT, true);
// store encypted key, tag, iv and salt
addSalt(pcb._ciphersuite_params, salt);
// get the RSA key
RSA *rsa_key = long_key.getRSA();
// encrypt the random key and add it to the ciphersuite params
addKey(pcb._ciphersuite_params, ephemeral_key, ibrcommon::AES128Stream::key_size_in_bytes, rsa_key);
// free the RSA key
long_key.free(rsa_key);
pcb._ciphersuite_params.set(SecurityBlock::initialization_vector, iv, ibrcommon::AES128Stream::iv_len);
pcb._ciphersuite_flags |= SecurityBlock::CONTAINS_CIPHERSUITE_PARAMS;
pcb._security_result.set(SecurityBlock::PCB_integrity_check_value, tag, ibrcommon::AES128Stream::tag_len);
pcb._ciphersuite_flags |= SecurityBlock::CONTAINS_SECURITY_RESULT;
}
