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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>
#include "base/logging.h"
using base::StringPiece;
namespace net {
namespace {
const size_t kKeySize = 32;
const size_t kNoncePrefixSize = 0;
} // namespace
#if defined(USE_NSS)
// System NSS doesn't support ChaCha20+Poly1305 yet.
ChaCha20Poly1305Decrypter::ChaCha20Poly1305Decrypter()
: AeadBaseDecrypter(CKM_INVALID_MECHANISM, NULL, kKeySize,
kAuthTagSize, kNoncePrefixSize) {
NOTIMPLEMENTED();
}
ChaCha20Poly1305Decrypter::~ChaCha20Poly1305Decrypter() {}
// static
bool ChaCha20Poly1305Decrypter::IsSupported() {
return false;
}
void ChaCha20Poly1305Decrypter::FillAeadParams(StringPiece nonce,
StringPiece associated_data,
size_t auth_tag_size,
AeadParams* aead_params) const {
NOTIMPLEMENTED();
}
#else // defined(USE_NSS)
ChaCha20Poly1305Decrypter::ChaCha20Poly1305Decrypter()
: AeadBaseDecrypter(CKM_NSS_CHACHA20_POLY1305, PK11_Decrypt, kKeySize,
kAuthTagSize, kNoncePrefixSize) {
COMPILE_ASSERT(kKeySize <= kMaxKeySize, key_size_too_big);
COMPILE_ASSERT(kNoncePrefixSize <= kMaxNoncePrefixSize,
nonce_prefix_size_too_big);
}
ChaCha20Poly1305Decrypter::~ChaCha20Poly1305Decrypter() {}
// static
bool ChaCha20Poly1305Decrypter::IsSupported() {
return true;
}
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;
}
#endif // defined(USE_NSS)
} // namespace net
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