CrackSharp

Efficiently decrypt DES hashes produced by crypt(3).

Decryption is performed by .NET applications and is based on brute-force method. High decryption speed is achieved by heavy usage of stack-allocated Span<T> and ReadOnlySpan<T>, there is no heap allocation during decryption.

Contents

Notable projects:

• CrackSharp.Cmd is a console app written as a solution to CS50's Crack problem
• CrackSharp.Api is a WebAPI service, ready for Docker

Usage

Deployment and usage examples are located in the corresponding project directories.

Decryption speed

1. The longer the word behind a hash, the longer it will take to decrypt this hash.
2. Same applies to a charset you feed to the app which it then uses to build words: decryption of 50E5eT91y/Q.g with a charset abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789 (letters and digits) takes approximately 68% longer than with the same charset but without digits.