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The SHA-256 Project
Developed for an applied cryptography course at NYU Tandon, this project focuses on SHA-256.
About The SHA-256 Project
The SHA-256 Project is a course assignment in which learners implement the SHA-256 hash function themselves, following a set of 16 problems. The project is based on pseudocode from Wikipedia and builds up the algorithm piece by piece, with tests at each step. It ends with a demonstration of a length extension attack using the learner's own implementation.
The project was originally assigned in NYU Tandon's CS-GY 6903 Applied Cryptography course in Fall 2021. The repository states that the work is intended to be JSON-in-JSON-out and autograded, and that a simplified grading script is included. The author warns that small mistakes can produce completely wrong output without useful error messages, so the project is described as challenging.
Key features
- 16 step-by-step problems that build a SHA-256 implementation from pseudocode
- Length extension attack demonstration using the learner's own implementation
- Simplified grade.py script for checking JSON output
- Example input and example output files for comparison
- Example solutions provided in both Python and Rust
- Problems may be solved in any programming language
Best for: Students in an applied cryptography course, or self-directed learners who want to understand SHA-256 by implementing it.
Good for
- Includes example solutions in Python and Rust for comparison
- Breaks the algorithm into testable steps, each with its own problem
- Explains why implementing a hash function helps with using SHA-2 safely
Watch out for
- The author notes that mistakes are difficult to debug
- The included grading script is described as simplified
The SHA-256 Project at a glance
- Category
- Education & Learning › Learn to Code
- Type
- Open-source project
- Pricing
- Not confirmed. Check the site
- Open source
- Not stated
- Language
- English
- Last checked
- Oct 6, 2026 · Online when checked
- Listed
- Oct 5, 2026
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The SHA-256 Project FAQ
Can I write the solution in a language other than Python?
Yes. The repository says you can code in whatever language you like. The original course used Python, and example solutions are provided in Python and Rust.
How can I check my output without the grading script?
The repository says you can visually compare the output of your solution to the example output provided.
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