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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/quic/crypto/chacha20_poly1305_decrypter.h"
#include <pk11pub.h>
using base::StringPiece;
namespace net {
namespace {
const size_t kKeySize = 32;
const size_t kNoncePrefixSize = 0;
} // namespace
ChaCha20Poly1305Decrypter::ChaCha20Poly1305Decrypter()
: AeadBaseDecrypter(CKM_NSS_CHACHA20_POLY1305,
kKeySize,
kAuthTagSize,
kNoncePrefixSize) {
static_assert(kKeySize <= kMaxKeySize, "key size too big");
static_assert(kNoncePrefixSize <= kMaxNoncePrefixSize,
"nonce prefix size too big");
}
ChaCha20Poly1305Decrypter::~ChaCha20Poly1305Decrypter() {}
void ChaCha20Poly1305Decrypter::FillAeadParams(StringPiece nonce,
StringPiece associated_data,
size_t auth_tag_size,
AeadParams* aead_params) const {
aead_params->len = sizeof(aead_params->data.nss_aead_params);
CK_NSS_AEAD_PARAMS* nss_aead_params = &aead_params->data.nss_aead_params;
nss_aead_params->pIv =
reinterpret_cast<CK_BYTE*>(const_cast<char*>(nonce.data()));
nss_aead_params->ulIvLen = nonce.size();
nss_aead_params->pAAD =
reinterpret_cast<CK_BYTE*>(const_cast<char*>(associated_data.data()));
nss_aead_params->ulAADLen = associated_data.size();
nss_aead_params->ulTagLen = auth_tag_size;
}
const char* ChaCha20Poly1305Decrypter::cipher_name() const {
// TODO(rtenneti): Use TLS1_TXT_ECDHE_RSA_WITH_CHACHA20_POLY1305 instead of
// hard coded string.
// return TLS1_TXT_ECDHE_RSA_WITH_CHACHA20_POLY1305;
return "ECDHE-RSA-CHACHA20-POLY1305";
}
uint32_t ChaCha20Poly1305Decrypter::cipher_id() const {
// TODO(rtenneti): when Chromium requires NSS 3.15.2 or later, use
// TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305 instead of 0xCC13.
// "OR" 0x03000000 to match OpenSSL/BoringSSL implementations.
return 0x03000000 | 0xCC13;
}
} // namespace net
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