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Date: Mon, 18 Jun 2018 12:22:03 +0000
From: crack.cast5@...mail.net
To: john-users@...ts.openwall.com
Subject: Re: CAST5 GPU cracking

Thank you. GPG --list-packets shows my key has having the following  
line for its S2K configuration:
gnu-dummy S2K, algo: 0, simple checksum, hash: 0

Based on RFC4880 I think this is CAST5 with SHA1 but no iterations. Is  
it possible to benchmark this with the --test option to John?

Quoting Dhiru Kholia <dhiru.kholia@...il.com>:

> On Mon, Jun 18, 2018 at 12:14:39AM +0000, crack.cast5@...mail.net wrote:
>>
>> I am trying to crack an old PGP key which is encrypted with CAST5. What GPU
>> works best for this purpose? I have not been able to find any benchmarks.
>> Should CAST5 scale like any other algorithms in general?
>
> Number of CPUs also play an important part when cracking GPG keys on  
> the GPUs.
>
> $ ../run/john --test --format=gpg
> Benchmarking: gpg, OpenPGP / GnuPG Secret Key [32/64]... (32xOMP) DONE
> Speed for cost 1 (s2k-count) of 65536, cost 2 (hash algorithm [1:MD5  
> 2:SHA1 3:RIPEMD160 8:SHA256 9:SHA384 10:SHA512 11:SHA224]) of 2,  
> cost 3 (cipher algorithm [1:IDEA 2:3DES 3:CAST5 4:Blowfish 7:AES128  
> 8:AES192 9:AES256 10:Twofish 11:Camellia128 12:Camellia192  
> 13:Camellia256]) of 3
> Warning: "Many salts" test limited: 67/256
> Many salts:	137216 c/s real, 4289 c/s virtual
> Only one salt:	133829 c/s real, 4250 c/s virtual
>
> $ OMP_NUM_THREADS=1 ../run/john --test --format=gpg-opencl
> Warning: OpenMP is disabled; GPU may be under-utilized
> Device 6: GeForce GTX TITAN X
> Benchmarking: gpg-opencl, OpenPGP / GnuPG Secret Key [SHA1/SHA2  
> OpenCL]... DONE
> Speed for cost 1 (s2k-count) of 65536, cost 2 (hash algorithm  
> [2:SHA1 8:SHA256 10:SHA512]) of 2, cost 3 (cipher algorithm [1:IDEA  
> 2:3DES 3:CAST5 4:Blowfish 7:AES128 8:AES192 9:AES256 10:Twofish  
> 11:Camellia128 12:Camellia192 13:Camellia256]) of 3
> Warning: "Many salts" test limited: 34/256
> Many salts:	835584 c/s real, 811246 c/s virtual, GPU util: 45%
> Only one salt:	795105 c/s real, 765101 c/s virtual
>
> $ ../run/john --test --format=gpg-opencl
> Device 6: GeForce GTX TITAN X
> Benchmarking: gpg-opencl, OpenPGP / GnuPG Secret Key [SHA1/SHA2  
> OpenCL]... (32xOMP) DONE
> Speed for cost 1 (s2k-count) of 65536, cost 2 (hash algorithm  
> [2:SHA1 8:SHA256 10:SHA512]) of 2, cost 3 (cipher algorithm [1:IDEA  
> 2:3DES 3:CAST5 4:Blowfish 7:AES128 8:AES192 9:AES256 10:Twofish  
> 11:Camellia128 12:Camellia192 13:Camellia256]) of 3
> Warning: "Many salts" test limited: 64/256
> Many salts:	1572K c/s real, 505744 c/s virtual, GPU util: 85%
> Only one salt:	1449K c/s real, 489859 c/s virtual
>
> Use the latest, biggest, and fastest CPUs and (NVIDIA) GPUs you can ;)
>
> --
> Dhiru




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