Intel SGX would allow implementing this efficiently in-process: https://software.intel.com/en-us/blogs/2013/09/26/protecting-application-secrets-with-intel-sgx

Intel SGX would allow implementing this efficiently in-process: https://software.intel.com/en-us/blogs/2013/09/26/protecting-application-secrets-with-intel-sgx https://software.intel.com/en-us/blogs/2013/09/26/protecting...