33     if (salt_.get() != nullptr && salt_len_ > 0) {  in GenerateKey()
34         result = prk_hmac.Init(salt_.get(), salt_len_);  in GenerateKey()
37         if (zeros.get() == nullptr) return false;  in GenerateKey()
39         memset(zeros.get(), 0, digest_size_);  in GenerateKey()
40         result = prk_hmac.Init(zeros.get(), digest_size_);  in GenerateKey()
45     if (pseudo_random_key.get() == nullptr || digest_size_ != prk_hmac.DigestLength()) return false;  in GenerateKey()
47         prk_hmac.Sign(secret_key_.get(), secret_key_len_, pseudo_random_key.get(), digest_size_);  in GenerateKey()
59     if (buf.get() == nullptr || digest.get() == nullptr) return false;  in GenerateKey()
61     result = hmac.Init(pseudo_random_key.get(), digest_size_);  in GenerateKey()
67             memcpy(buf.get(), digest.get(), digest_size_);  in GenerateKey()
70         if (info != nullptr && info_len > 0) memcpy(buf.get() + block_input_len, info, info_len);  in GenerateKey()
72         *(buf.get() + block_input_len++) = static_cast<uint8_t>(i + 1);  in GenerateKey()
73         result = hmac.Sign(buf.get(), block_input_len, digest.get(), digest_size_);  in GenerateKey()
78         memcpy(output + i * digest_size_, digest.get(), block_output_len);  in GenerateKey()