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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "tls_protect.h"
#include "sslproto.h"
#include "tls_filter.h"
namespace nss_test {
static uint64_t FirstSeqno(bool dtls, uint16_t epoc) {
if (dtls) {
return static_cast<uint64_t>(epoc) << 48;
}
return 0;
}
TlsCipherSpec::TlsCipherSpec(bool dtls, uint16_t epoc)
: dtls_(dtls),
epoch_(epoc),
in_seqno_(FirstSeqno(dtls, epoc)),
out_seqno_(FirstSeqno(dtls, epoc)) {}
bool TlsCipherSpec::SetKeys(SSLCipherSuiteInfo* cipherinfo,
PK11SymKey* secret) {
SSLAeadContext* ctx;
SECStatus rv = SSL_MakeAead(SSL_LIBRARY_VERSION_TLS_1_3,
cipherinfo->cipherSuite, secret, "",
0, // Use the default labels.
&ctx);
if (rv != SECSuccess) {
return false;
}
aead_.reset(ctx);
return true;
}
bool TlsCipherSpec::Unprotect(const TlsRecordHeader& header,
const DataBuffer& ciphertext,
DataBuffer* plaintext) {
if (aead_ == nullptr) {
return false;
}
// Make space.
plaintext->Allocate(ciphertext.len());
auto header_bytes = header.header();
unsigned int len;
uint64_t seqno;
if (dtls_) {
seqno = header.sequence_number();
} else {
seqno = in_seqno_;
}
SECStatus rv =
SSL_AeadDecrypt(aead_.get(), seqno, header_bytes.data(),
header_bytes.len(), ciphertext.data(), ciphertext.len(),
plaintext->data(), &len, plaintext->len());
if (rv != SECSuccess) {
return false;
}
RecordUnprotected(seqno);
plaintext->Truncate(static_cast<size_t>(len));
return true;
}
bool TlsCipherSpec::Protect(const TlsRecordHeader& header,
const DataBuffer& plaintext,
DataBuffer* ciphertext) {
if (aead_ == nullptr) {
return false;
}
// Make a padded buffer.
ciphertext->Allocate(plaintext.len() +
32); // Room for any plausible auth tag
unsigned int len;
DataBuffer header_bytes;
(void)header.WriteHeader(&header_bytes, 0, plaintext.len() + 16);
uint64_t seqno;
if (dtls_) {
seqno = header.sequence_number();
} else {
seqno = out_seqno_;
}
SECStatus rv =
SSL_AeadEncrypt(aead_.get(), seqno, header_bytes.data(),
header_bytes.len(), plaintext.data(), plaintext.len(),
ciphertext->data(), &len, ciphertext->len());
if (rv != SECSuccess) {
return false;
}
RecordProtected();
ciphertext->Truncate(len);
return true;
}
} // namespace nss_test
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