CPC-MD5

This project is forked from Marc Steven's Hashclash project hashclash and follows GPL.

Details

Same to hashclash, this tool depends on boost. make will download libboost and finish everything.

Compilation

In Makefile.local, one needs to specify the CUDA SDK information to enable CUDA. Several variables need to be set properly, including CUDA_TK, CUDA_SDK and CUDA_SAMPLE_DIR.

Performance Tuning

In scripts/cpc.sh, several variables are defined:

CPUS The number of cores used in the attack.

CUDAS The count of CUDA devices used in the attack.

With CUDA

Using CUDA devices for the 1st stage birthday search is strongly recommended. The default cpc.sh is set to use 1 CPU thread and 3 CUDA devices for the birthday searching.

$BIRTHDAYSEARCH --inputfile1 "$file1" --inputfile2 "$file2" --hybridbits 0 --pathtyperange 2 --maxblocks 9 --maxmemory 100 --threads 1 --cuda_enable

Without CUDA

For platforms without CUDA devices, the number of CPU cores and luck affect the performance significantly. To enable CPU-only birthday searching, cpc.sh needs to be modified as follows.

$BIRTHDAYSEARCH --inputfile1 "$file1" --inputfile2 "$file2" --hybridbits 0 --pathtyperange 2 --maxblocks 9 --maxmemory 100 --threads $(CPUS)

Comments

Sources provided AS IS and entirely credit to Marc Stevens