37     if (salt_.get() != nullptr && salt_len_ > 0) {  in GenerateKey()
38         result = prk_hmac.Init(salt_.get(), salt_len_);  in GenerateKey()
41         if (zeros.get() == nullptr)  in GenerateKey()
44         memset(zeros.get(), 0, digest_size_);  in GenerateKey()
45         result = prk_hmac.Init(zeros.get(), digest_size_);  in GenerateKey()
51     if (pseudo_random_key.get() == nullptr || digest_size_ != prk_hmac.DigestLength())  in GenerateKey()
54         prk_hmac.Sign(secret_key_.get(), secret_key_len_, pseudo_random_key.get(), digest_size_);  in GenerateKey()
68     if (buf.get() == nullptr || digest.get() == nullptr)  in GenerateKey()
71     result = hmac.Init(pseudo_random_key.get(), digest_size_);  in GenerateKey()
78             memcpy(buf.get(), digest.get(), digest_size_);  in GenerateKey()
82             memcpy(buf.get() + block_input_len, info, info_len);  in GenerateKey()
84         *(buf.get() + block_input_len++) = static_cast<uint8_t>(i + 1);  in GenerateKey()
85         result = hmac.Sign(buf.get(), block_input_len, digest.get(), digest_size_);  in GenerateKey()
91         memcpy(output + i * digest_size_, digest.get(), block_output_len);  in GenerateKey()