mirror of
https://github.com/DrKLO/Telegram.git
synced 2024-12-23 06:50:36 +01:00
483 lines
15 KiB
C++
483 lines
15 KiB
C++
|
/* Copyright (c) 2015, Google Inc.
|
||
|
*
|
||
|
* Permission to use, copy, modify, and/or distribute this software for any
|
||
|
* purpose with or without fee is hereby granted, provided that the above
|
||
|
* copyright notice and this permission notice appear in all copies.
|
||
|
*
|
||
|
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
||
|
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
||
|
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
|
||
|
* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
||
|
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
|
||
|
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
|
||
|
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
|
||
|
|
||
|
#include <openssl/ssl.h>
|
||
|
|
||
|
#include <assert.h>
|
||
|
#include <string.h>
|
||
|
|
||
|
#include <utility>
|
||
|
|
||
|
#include <openssl/bn.h>
|
||
|
#include <openssl/bytestring.h>
|
||
|
#include <openssl/curve25519.h>
|
||
|
#include <openssl/ec.h>
|
||
|
#include <openssl/err.h>
|
||
|
#include <openssl/hrss.h>
|
||
|
#include <openssl/mem.h>
|
||
|
#include <openssl/nid.h>
|
||
|
#include <openssl/rand.h>
|
||
|
|
||
|
#include "internal.h"
|
||
|
#include "../crypto/internal.h"
|
||
|
#include "../third_party/sike/sike.h"
|
||
|
|
||
|
BSSL_NAMESPACE_BEGIN
|
||
|
|
||
|
namespace {
|
||
|
|
||
|
class ECKeyShare : public SSLKeyShare {
|
||
|
public:
|
||
|
ECKeyShare(int nid, uint16_t group_id) : nid_(nid), group_id_(group_id) {}
|
||
|
|
||
|
uint16_t GroupID() const override { return group_id_; }
|
||
|
|
||
|
bool Offer(CBB *out) override {
|
||
|
assert(!private_key_);
|
||
|
// Set up a shared |BN_CTX| for all operations.
|
||
|
UniquePtr<BN_CTX> bn_ctx(BN_CTX_new());
|
||
|
if (!bn_ctx) {
|
||
|
return false;
|
||
|
}
|
||
|
BN_CTXScope scope(bn_ctx.get());
|
||
|
|
||
|
// Generate a private key.
|
||
|
UniquePtr<EC_GROUP> group(EC_GROUP_new_by_curve_name(nid_));
|
||
|
private_key_.reset(BN_new());
|
||
|
if (!group || !private_key_ ||
|
||
|
!BN_rand_range_ex(private_key_.get(), 1,
|
||
|
EC_GROUP_get0_order(group.get()))) {
|
||
|
return false;
|
||
|
}
|
||
|
|
||
|
// Compute the corresponding public key and serialize it.
|
||
|
UniquePtr<EC_POINT> public_key(EC_POINT_new(group.get()));
|
||
|
if (!public_key ||
|
||
|
!EC_POINT_mul(group.get(), public_key.get(), private_key_.get(), NULL,
|
||
|
NULL, bn_ctx.get()) ||
|
||
|
!EC_POINT_point2cbb(out, group.get(), public_key.get(),
|
||
|
POINT_CONVERSION_UNCOMPRESSED, bn_ctx.get())) {
|
||
|
return false;
|
||
|
}
|
||
|
|
||
|
return true;
|
||
|
}
|
||
|
|
||
|
bool Finish(Array<uint8_t> *out_secret, uint8_t *out_alert,
|
||
|
Span<const uint8_t> peer_key) override {
|
||
|
assert(private_key_);
|
||
|
*out_alert = SSL_AD_INTERNAL_ERROR;
|
||
|
|
||
|
// Set up a shared |BN_CTX| for all operations.
|
||
|
UniquePtr<BN_CTX> bn_ctx(BN_CTX_new());
|
||
|
if (!bn_ctx) {
|
||
|
return false;
|
||
|
}
|
||
|
BN_CTXScope scope(bn_ctx.get());
|
||
|
|
||
|
UniquePtr<EC_GROUP> group(EC_GROUP_new_by_curve_name(nid_));
|
||
|
if (!group) {
|
||
|
return false;
|
||
|
}
|
||
|
|
||
|
UniquePtr<EC_POINT> peer_point(EC_POINT_new(group.get()));
|
||
|
UniquePtr<EC_POINT> result(EC_POINT_new(group.get()));
|
||
|
BIGNUM *x = BN_CTX_get(bn_ctx.get());
|
||
|
if (!peer_point || !result || !x) {
|
||
|
return false;
|
||
|
}
|
||
|
|
||
|
if (peer_key.empty() || peer_key[0] != POINT_CONVERSION_UNCOMPRESSED ||
|
||
|
!EC_POINT_oct2point(group.get(), peer_point.get(), peer_key.data(),
|
||
|
peer_key.size(), bn_ctx.get())) {
|
||
|
OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_ECPOINT);
|
||
|
*out_alert = SSL_AD_DECODE_ERROR;
|
||
|
return false;
|
||
|
}
|
||
|
|
||
|
// Compute the x-coordinate of |peer_key| * |private_key_|.
|
||
|
if (!EC_POINT_mul(group.get(), result.get(), NULL, peer_point.get(),
|
||
|
private_key_.get(), bn_ctx.get()) ||
|
||
|
!EC_POINT_get_affine_coordinates_GFp(group.get(), result.get(), x, NULL,
|
||
|
bn_ctx.get())) {
|
||
|
return false;
|
||
|
}
|
||
|
|
||
|
// Encode the x-coordinate left-padded with zeros.
|
||
|
Array<uint8_t> secret;
|
||
|
if (!secret.Init((EC_GROUP_get_degree(group.get()) + 7) / 8) ||
|
||
|
!BN_bn2bin_padded(secret.data(), secret.size(), x)) {
|
||
|
return false;
|
||
|
}
|
||
|
|
||
|
*out_secret = std::move(secret);
|
||
|
return true;
|
||
|
}
|
||
|
|
||
|
bool Serialize(CBB *out) override {
|
||
|
assert(private_key_);
|
||
|
CBB cbb;
|
||
|
UniquePtr<EC_GROUP> group(EC_GROUP_new_by_curve_name(nid_));
|
||
|
// Padding is added to avoid leaking the length.
|
||
|
size_t len = BN_num_bytes(EC_GROUP_get0_order(group.get()));
|
||
|
if (!CBB_add_asn1_uint64(out, group_id_) ||
|
||
|
!CBB_add_asn1(out, &cbb, CBS_ASN1_OCTETSTRING) ||
|
||
|
!BN_bn2cbb_padded(&cbb, len, private_key_.get()) ||
|
||
|
!CBB_flush(out)) {
|
||
|
return false;
|
||
|
}
|
||
|
return true;
|
||
|
}
|
||
|
|
||
|
bool Deserialize(CBS *in) override {
|
||
|
assert(!private_key_);
|
||
|
CBS private_key;
|
||
|
if (!CBS_get_asn1(in, &private_key, CBS_ASN1_OCTETSTRING)) {
|
||
|
return false;
|
||
|
}
|
||
|
private_key_.reset(BN_bin2bn(CBS_data(&private_key),
|
||
|
CBS_len(&private_key), nullptr));
|
||
|
return private_key_ != nullptr;
|
||
|
}
|
||
|
|
||
|
private:
|
||
|
UniquePtr<BIGNUM> private_key_;
|
||
|
int nid_;
|
||
|
uint16_t group_id_;
|
||
|
};
|
||
|
|
||
|
class X25519KeyShare : public SSLKeyShare {
|
||
|
public:
|
||
|
X25519KeyShare() {}
|
||
|
|
||
|
uint16_t GroupID() const override { return SSL_CURVE_X25519; }
|
||
|
|
||
|
bool Offer(CBB *out) override {
|
||
|
uint8_t public_key[32];
|
||
|
X25519_keypair(public_key, private_key_);
|
||
|
return !!CBB_add_bytes(out, public_key, sizeof(public_key));
|
||
|
}
|
||
|
|
||
|
bool Finish(Array<uint8_t> *out_secret, uint8_t *out_alert,
|
||
|
Span<const uint8_t> peer_key) override {
|
||
|
*out_alert = SSL_AD_INTERNAL_ERROR;
|
||
|
|
||
|
Array<uint8_t> secret;
|
||
|
if (!secret.Init(32)) {
|
||
|
OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
|
||
|
return false;
|
||
|
}
|
||
|
|
||
|
if (peer_key.size() != 32 ||
|
||
|
!X25519(secret.data(), private_key_, peer_key.data())) {
|
||
|
*out_alert = SSL_AD_DECODE_ERROR;
|
||
|
OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_ECPOINT);
|
||
|
return false;
|
||
|
}
|
||
|
|
||
|
*out_secret = std::move(secret);
|
||
|
return true;
|
||
|
}
|
||
|
|
||
|
bool Serialize(CBB *out) override {
|
||
|
return (CBB_add_asn1_uint64(out, GroupID()) &&
|
||
|
CBB_add_asn1_octet_string(out, private_key_, sizeof(private_key_)));
|
||
|
}
|
||
|
|
||
|
bool Deserialize(CBS *in) override {
|
||
|
CBS key;
|
||
|
if (!CBS_get_asn1(in, &key, CBS_ASN1_OCTETSTRING) ||
|
||
|
CBS_len(&key) != sizeof(private_key_) ||
|
||
|
!CBS_copy_bytes(&key, private_key_, sizeof(private_key_))) {
|
||
|
return false;
|
||
|
}
|
||
|
return true;
|
||
|
}
|
||
|
|
||
|
private:
|
||
|
uint8_t private_key_[32];
|
||
|
};
|
||
|
|
||
|
class CECPQ2KeyShare : public SSLKeyShare {
|
||
|
public:
|
||
|
CECPQ2KeyShare() {}
|
||
|
|
||
|
uint16_t GroupID() const override { return SSL_CURVE_CECPQ2; }
|
||
|
|
||
|
bool Offer(CBB *out) override {
|
||
|
uint8_t x25519_public_key[32];
|
||
|
X25519_keypair(x25519_public_key, x25519_private_key_);
|
||
|
|
||
|
uint8_t hrss_entropy[HRSS_GENERATE_KEY_BYTES];
|
||
|
HRSS_public_key hrss_public_key;
|
||
|
RAND_bytes(hrss_entropy, sizeof(hrss_entropy));
|
||
|
HRSS_generate_key(&hrss_public_key, &hrss_private_key_, hrss_entropy);
|
||
|
|
||
|
uint8_t hrss_public_key_bytes[HRSS_PUBLIC_KEY_BYTES];
|
||
|
HRSS_marshal_public_key(hrss_public_key_bytes, &hrss_public_key);
|
||
|
|
||
|
if (!CBB_add_bytes(out, x25519_public_key, sizeof(x25519_public_key)) ||
|
||
|
!CBB_add_bytes(out, hrss_public_key_bytes,
|
||
|
sizeof(hrss_public_key_bytes))) {
|
||
|
return false;
|
||
|
}
|
||
|
|
||
|
return true;
|
||
|
}
|
||
|
|
||
|
bool Accept(CBB *out_public_key, Array<uint8_t> *out_secret,
|
||
|
uint8_t *out_alert, Span<const uint8_t> peer_key) override {
|
||
|
Array<uint8_t> secret;
|
||
|
if (!secret.Init(32 + HRSS_KEY_BYTES)) {
|
||
|
OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
|
||
|
return false;
|
||
|
}
|
||
|
|
||
|
uint8_t x25519_public_key[32];
|
||
|
X25519_keypair(x25519_public_key, x25519_private_key_);
|
||
|
|
||
|
HRSS_public_key peer_public_key;
|
||
|
if (peer_key.size() != 32 + HRSS_PUBLIC_KEY_BYTES ||
|
||
|
!HRSS_parse_public_key(&peer_public_key, peer_key.data() + 32) ||
|
||
|
!X25519(secret.data(), x25519_private_key_, peer_key.data())) {
|
||
|
*out_alert = SSL_AD_DECODE_ERROR;
|
||
|
OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_ECPOINT);
|
||
|
return false;
|
||
|
}
|
||
|
|
||
|
uint8_t ciphertext[HRSS_CIPHERTEXT_BYTES];
|
||
|
uint8_t entropy[HRSS_ENCAP_BYTES];
|
||
|
RAND_bytes(entropy, sizeof(entropy));
|
||
|
HRSS_encap(ciphertext, secret.data() + 32, &peer_public_key, entropy);
|
||
|
|
||
|
if (!CBB_add_bytes(out_public_key, x25519_public_key,
|
||
|
sizeof(x25519_public_key)) ||
|
||
|
!CBB_add_bytes(out_public_key, ciphertext, sizeof(ciphertext))) {
|
||
|
return false;
|
||
|
}
|
||
|
|
||
|
*out_secret = std::move(secret);
|
||
|
return true;
|
||
|
}
|
||
|
|
||
|
bool Finish(Array<uint8_t> *out_secret, uint8_t *out_alert,
|
||
|
Span<const uint8_t> peer_key) override {
|
||
|
*out_alert = SSL_AD_INTERNAL_ERROR;
|
||
|
|
||
|
Array<uint8_t> secret;
|
||
|
if (!secret.Init(32 + HRSS_KEY_BYTES)) {
|
||
|
OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
|
||
|
return false;
|
||
|
}
|
||
|
|
||
|
if (peer_key.size() != 32 + HRSS_CIPHERTEXT_BYTES ||
|
||
|
!X25519(secret.data(), x25519_private_key_, peer_key.data())) {
|
||
|
*out_alert = SSL_AD_DECODE_ERROR;
|
||
|
OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_ECPOINT);
|
||
|
return false;
|
||
|
}
|
||
|
|
||
|
HRSS_decap(secret.data() + 32, &hrss_private_key_, peer_key.data() + 32,
|
||
|
peer_key.size() - 32);
|
||
|
|
||
|
*out_secret = std::move(secret);
|
||
|
return true;
|
||
|
}
|
||
|
|
||
|
private:
|
||
|
uint8_t x25519_private_key_[32];
|
||
|
HRSS_private_key hrss_private_key_;
|
||
|
};
|
||
|
|
||
|
class CECPQ2bKeyShare : public SSLKeyShare {
|
||
|
public:
|
||
|
uint16_t GroupID() const override { return SSL_CURVE_CECPQ2b; }
|
||
|
|
||
|
bool Offer(CBB *out) override {
|
||
|
uint8_t public_x25519[32] = {0};
|
||
|
X25519_keypair(public_x25519, private_x25519_);
|
||
|
if (!SIKE_keypair(private_sike_, public_sike_)) {
|
||
|
return false;
|
||
|
}
|
||
|
|
||
|
return CBB_add_bytes(out, public_x25519, sizeof(public_x25519)) &&
|
||
|
CBB_add_bytes(out, public_sike_, sizeof(public_sike_));
|
||
|
}
|
||
|
|
||
|
bool Accept(CBB *out_public_key, Array<uint8_t> *out_secret,
|
||
|
uint8_t *out_alert, Span<const uint8_t> peer_key) override {
|
||
|
uint8_t public_x25519[32];
|
||
|
uint8_t private_x25519[32];
|
||
|
uint8_t sike_ciphertext[SIKE_CT_BYTESZ] = {0};
|
||
|
|
||
|
*out_alert = SSL_AD_INTERNAL_ERROR;
|
||
|
|
||
|
if (peer_key.size() != sizeof(public_x25519) + SIKE_PUB_BYTESZ) {
|
||
|
*out_alert = SSL_AD_DECODE_ERROR;
|
||
|
OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_ECPOINT);
|
||
|
return false;
|
||
|
}
|
||
|
|
||
|
Array<uint8_t> secret;
|
||
|
if (!secret.Init(sizeof(private_x25519_) + SIKE_SS_BYTESZ)) {
|
||
|
OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
|
||
|
return false;
|
||
|
}
|
||
|
|
||
|
X25519_keypair(public_x25519, private_x25519);
|
||
|
if (!X25519(secret.data(), private_x25519, peer_key.data())) {
|
||
|
*out_alert = SSL_AD_DECODE_ERROR;
|
||
|
OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_ECPOINT);
|
||
|
return false;
|
||
|
}
|
||
|
|
||
|
SIKE_encaps(secret.data() + sizeof(private_x25519_), sike_ciphertext,
|
||
|
peer_key.data() + sizeof(public_x25519));
|
||
|
*out_secret = std::move(secret);
|
||
|
|
||
|
return CBB_add_bytes(out_public_key, public_x25519,
|
||
|
sizeof(public_x25519)) &&
|
||
|
CBB_add_bytes(out_public_key, sike_ciphertext,
|
||
|
sizeof(sike_ciphertext));
|
||
|
}
|
||
|
|
||
|
bool Finish(Array<uint8_t> *out_secret, uint8_t *out_alert,
|
||
|
Span<const uint8_t> peer_key) override {
|
||
|
*out_alert = SSL_AD_INTERNAL_ERROR;
|
||
|
|
||
|
Array<uint8_t> secret;
|
||
|
if (!secret.Init(sizeof(private_x25519_) + SIKE_SS_BYTESZ)) {
|
||
|
OPENSSL_PUT_ERROR(SSL, ERR_R_MALLOC_FAILURE);
|
||
|
return false;
|
||
|
}
|
||
|
|
||
|
if (peer_key.size() != 32 + SIKE_CT_BYTESZ ||
|
||
|
!X25519(secret.data(), private_x25519_, peer_key.data())) {
|
||
|
*out_alert = SSL_AD_DECODE_ERROR;
|
||
|
OPENSSL_PUT_ERROR(SSL, SSL_R_BAD_ECPOINT);
|
||
|
return false;
|
||
|
}
|
||
|
|
||
|
SIKE_decaps(secret.data() + sizeof(private_x25519_), peer_key.data() + 32,
|
||
|
public_sike_, private_sike_);
|
||
|
*out_secret = std::move(secret);
|
||
|
return true;
|
||
|
}
|
||
|
|
||
|
private:
|
||
|
uint8_t private_x25519_[32];
|
||
|
uint8_t private_sike_[SIKE_PRV_BYTESZ];
|
||
|
uint8_t public_sike_[SIKE_PUB_BYTESZ];
|
||
|
};
|
||
|
|
||
|
CONSTEXPR_ARRAY NamedGroup kNamedGroups[] = {
|
||
|
{NID_secp224r1, SSL_CURVE_SECP224R1, "P-224", "secp224r1"},
|
||
|
{NID_X9_62_prime256v1, SSL_CURVE_SECP256R1, "P-256", "prime256v1"},
|
||
|
{NID_secp384r1, SSL_CURVE_SECP384R1, "P-384", "secp384r1"},
|
||
|
{NID_secp521r1, SSL_CURVE_SECP521R1, "P-521", "secp521r1"},
|
||
|
{NID_X25519, SSL_CURVE_X25519, "X25519", "x25519"},
|
||
|
{NID_CECPQ2, SSL_CURVE_CECPQ2, "CECPQ2", "CECPQ2"},
|
||
|
{NID_CECPQ2b, SSL_CURVE_CECPQ2b, "CECPQ2b", "CECPQ2b"},
|
||
|
};
|
||
|
|
||
|
} // namespace
|
||
|
|
||
|
Span<const NamedGroup> NamedGroups() {
|
||
|
return MakeConstSpan(kNamedGroups, OPENSSL_ARRAY_SIZE(kNamedGroups));
|
||
|
}
|
||
|
|
||
|
UniquePtr<SSLKeyShare> SSLKeyShare::Create(uint16_t group_id) {
|
||
|
switch (group_id) {
|
||
|
case SSL_CURVE_SECP224R1:
|
||
|
return UniquePtr<SSLKeyShare>(
|
||
|
New<ECKeyShare>(NID_secp224r1, SSL_CURVE_SECP224R1));
|
||
|
case SSL_CURVE_SECP256R1:
|
||
|
return UniquePtr<SSLKeyShare>(
|
||
|
New<ECKeyShare>(NID_X9_62_prime256v1, SSL_CURVE_SECP256R1));
|
||
|
case SSL_CURVE_SECP384R1:
|
||
|
return UniquePtr<SSLKeyShare>(
|
||
|
New<ECKeyShare>(NID_secp384r1, SSL_CURVE_SECP384R1));
|
||
|
case SSL_CURVE_SECP521R1:
|
||
|
return UniquePtr<SSLKeyShare>(
|
||
|
New<ECKeyShare>(NID_secp521r1, SSL_CURVE_SECP521R1));
|
||
|
case SSL_CURVE_X25519:
|
||
|
return UniquePtr<SSLKeyShare>(New<X25519KeyShare>());
|
||
|
case SSL_CURVE_CECPQ2:
|
||
|
return UniquePtr<SSLKeyShare>(New<CECPQ2KeyShare>());
|
||
|
case SSL_CURVE_CECPQ2b:
|
||
|
return UniquePtr<SSLKeyShare>(New<CECPQ2bKeyShare>());
|
||
|
default:
|
||
|
return nullptr;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
UniquePtr<SSLKeyShare> SSLKeyShare::Create(CBS *in) {
|
||
|
uint64_t group;
|
||
|
if (!CBS_get_asn1_uint64(in, &group) || group > 0xffff) {
|
||
|
return nullptr;
|
||
|
}
|
||
|
UniquePtr<SSLKeyShare> key_share = Create(static_cast<uint16_t>(group));
|
||
|
if (!key_share || !key_share->Deserialize(in)) {
|
||
|
return nullptr;
|
||
|
}
|
||
|
return key_share;
|
||
|
}
|
||
|
|
||
|
|
||
|
bool SSLKeyShare::Accept(CBB *out_public_key, Array<uint8_t> *out_secret,
|
||
|
uint8_t *out_alert, Span<const uint8_t> peer_key) {
|
||
|
*out_alert = SSL_AD_INTERNAL_ERROR;
|
||
|
return Offer(out_public_key) &&
|
||
|
Finish(out_secret, out_alert, peer_key);
|
||
|
}
|
||
|
|
||
|
bool ssl_nid_to_group_id(uint16_t *out_group_id, int nid) {
|
||
|
for (const auto &group : kNamedGroups) {
|
||
|
if (group.nid == nid) {
|
||
|
*out_group_id = group.group_id;
|
||
|
return true;
|
||
|
}
|
||
|
}
|
||
|
return false;
|
||
|
}
|
||
|
|
||
|
bool ssl_name_to_group_id(uint16_t *out_group_id, const char *name, size_t len) {
|
||
|
for (const auto &group : kNamedGroups) {
|
||
|
if (len == strlen(group.name) &&
|
||
|
!strncmp(group.name, name, len)) {
|
||
|
*out_group_id = group.group_id;
|
||
|
return true;
|
||
|
}
|
||
|
if (len == strlen(group.alias) &&
|
||
|
!strncmp(group.alias, name, len)) {
|
||
|
*out_group_id = group.group_id;
|
||
|
return true;
|
||
|
}
|
||
|
}
|
||
|
return false;
|
||
|
}
|
||
|
|
||
|
BSSL_NAMESPACE_END
|
||
|
|
||
|
using namespace bssl;
|
||
|
|
||
|
const char* SSL_get_curve_name(uint16_t group_id) {
|
||
|
for (const auto &group : kNamedGroups) {
|
||
|
if (group.group_id == group_id) {
|
||
|
return group.name;
|
||
|
}
|
||
|
}
|
||
|
return nullptr;
|
||
|
}
|