leetronics / infnoise-openssl

OpenSSL Engine for random number generation using the infnoise TRNG.

infnoise-openssl

OpenSSL engine for random number generation using the Infinite Noise TRNG.

This engine can be used generate true random data for any operations in OpenSSL which use random bits. This includes RSA and Eliptical Curve key generation, Diffie-Hellman key exchange, DSA and RSA-PSS signature salt generation, etc. It does not just seed the OpenSSL PRNG with data from the Infinite Noise TRNG, but instead provides a steady true random bitstream for cryptographic operations.

Prerequisites

This engine has been tested on both Mac and Linux (Debian, Ubuntu 18.04). Please feel free to add support for Windows.

OpenSSL

This engine requires, of course, engine support from OpenSSL. You can tell whether you have a version built with this support by checking for the directory /usr/local/lib/engines-openssl_version. If installed with your system it may be in /usr/lib instead. If you do not have it, get a copy from https//github.com/openssl/openssl, build, and install it.

$ git clone https://github.com/openssl/openssl && cd openssl
$ ./config && make && sudo make install

libinfnoise

This is the library which does the actual magic. You can obtain it from https://github.com/13-37-org/infnoise. Build and install both the "install" and "install-lib" targets.

$ git clone https://github.com/13-37-org/infnoise && cd software
$ make -f Makefile.linux install-lib

Building and using infnoise-openssl

Get a copy of this repository, cd into it, and just "make". Then copy infnoise.(dylib|so) to the openssl engines library directory.

Once installed, you need to tell OpenSSL to use the engine. To this effect you have to specify an environment variable called OPENSSL_CONF which contains the path to the file openssl-infnoise.cnf. You can either export this variable, or define it in the openssl command line. Then try a command along the lines of "openssl genrsa 4096" You should see a message indicating that the infnoise engine was loaded, or an error. If you don't get either, retrace the steps above.

$ export OPENSSL_CONF="openssl-infnoise.cnf"

# To check which engines are loaded
$ openssl engine

# Create huge keys very fast:
$ openssl genrsa 4096

# Test randomness provided by the TRNG
$ openssl rand 10000000 | ent

NOTE: On some systems you may have to run openssl as root (sudo openssl...) to get this to work. There must be a way to set the FTDI USB permissions to not require root access, but so far everything I've tried has failed. If anyone knows how to do this, I'd appreciate if you let me know how.

Answer: To run without root privileges, it's sufficient to add

SUBSYSTEM=="usb", ATTRS{idVendor}=="0403", ATTRS{idProduct}=="6015", SYMLINK+="infnoise", GROUP="dialout", MODE="0664"

to /etc/udev/rules.d/75-infnoise.rules

then reload udevd and add your user to the "dialout" group. For this to take effect, you'll need to re-login. If applicable, just reboot your machine after adding the line and assigning the group.

$ sudo service udev reload
$ śudo adduser manuel dialout

Thanks to WaywardGeek for the hardware design, as well as Manuel Domke (from 13-37.org electronics) for his work on libinfnoise.