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--- use_john_the_ripper_to_crack_password_hashes [31.01.2021 02:21] – [use john with openMP on multiple cores] Pascal Suter
+++ use_john_the_ripper_to_crack_password_hashes [31.01.2021 03:05] – Pascal Suter
@@ Line 35: / Line 35: @@
 to check the progress run
   kill -USR1 $(pidof mpirun)
+===== compile with OpenCL support to run on NVIDIA (and other) GPU's (tested on CentOS) =====
+download and install cuda if you haven't already
+  wget https://developer.download.nvidia.com/compute/cuda/11.2.0/local_installers/cuda_11.2.0_460.27.04_linux.run
+  sudo sh cuda_11.2.0_460.27.04_linux.run
+  wget https://github.com/openwall/john/archive/1.9.0-Jumbo-1.tar.gz
+  tar xvf 1.9.0-Jumbo-1.tar.gz
+  cd john-1.9.0-Jumbo-1/src
+  ./configure LDFLAGS=-L/usr/local/cuda/targets/x86_64-linux/lib CPPFLAGS=-I/usr/local/cuda/targets/x86_64-linux/include
+the summary should show that OpenCL support is now enabled (yes)
+  make -s clean && make -sj4
+now let's run it :) here is an example where I ran john the ripper on a server with 8x NVIDIA GeForce RTX 2080 Ti:
+  run/john --format=sha512crypt-opencl -dev=gpu -fork=8  ../root.unshadow
+the ''--format'' option needs to be specified in order to use the GPU at all. without specifying a format, john will always default to the CPU implementation of the crypt algo. to figure out which format to use, start john without a format parameter and then look at the output to find the crypt that was used. now run
+  run/john --list=formats --format=opencl
+to get a list of all crypts that support opencl. if you are lucky, the one you are looking for is in there as well :)
+the ''-dev=gpu -fork=8'' options are there to use all cards in parallel. this will fork 8 individual processes each working on their own range of passwords at a time and each on a different GPU. If you have multiple hosts with GPU you may use MPI for that.