Sha256 algorithm explained online

Last update: May 10, 2022

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Sha256algorithm

Sha256 algorithm explained online step by step visually sha256algorithm.com This website will help you understand how a sha256 hash is calculated from start to finish.

I hope this will be helpful for students learning about hash functions and sha256.

The code it's quite messy and probably there are some parts that don't follow the react way.

Ask me anything at @manceraio

Install

I built this using create-react-app. If you want to play with it, just install javascript dependencies:

npm install

and start local server:

npm start

GitHub

https://github.com/dmarman/sha256algorithm
Comments
  • 1. Fix incorrect initial hash values on second and later chunks

    Summary

    This PR will fix an issue that initial hash value on the second chunk isn't same as the updated hash value on the first chunk.

    Issue screenshot 1: updated h0 on the first chunk is 10101110101011001101110101110000. Issue screenshot 1

    Issue screenshot 2: initial h0 on the second chunk is 11000111011101001101001000011000. Issue screenshot 2

    The issue is caused because the for loop iterating secondLoop times in shaStepped() doesn't iterate maximum secondLoop times, i.e. 63 times, on the first chunk before entering into the second chunk and iterating secondLoop times on the second chunk. For example if secondLoop is 5, the for loop will iterate 5 times on the first chunk and 5 times on the second chunk. Instead it should iterate 63 times on the first chunk and 5 times on the second chunk.

    https://github.com/dmarman/sha256algorithm/blob/43f698c8f04a9bd8a0720b96c3fd99e1bd480fb8/src/App.js#L285-L347

    Test plan

    1. Paste "abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz" into input field.
    2. Advance to step 113 and check if updated value of h0 is 10101110101011001101110101110000.
    3. Advance to step 164 and check if initial value of h0 is 10101110101011001101110101110000.
    Reviewed by byeokim at 2022-02-08 23:54
  • 2. Question about computed SHA

    Hi, love your visualisation!

    I have a question, when I pass in the input this, I get the result as 1eb79602411ef02cf6fe117897015fff89f80face4eccd50425c45149b148408, however when I do it the "usual" way:

    # Mac
    ❯ echo 'this' | sha256sum
    c18d547cafb43e30a993439599bd08321bea17bfedbe28b13bce8a7f298b63a2  -
    
    # OpenBSD
    $ echo 'this' | sha256
    c18d547cafb43e30a993439599bd08321bea17bfedbe28b13bce8a7f298b63a2
    

    Could you please confirm?

    Reviewed by samebchase at 2022-02-08 09:46
  • 3. Icons for controls don't match their purpose

    Awesome visualization!

    I found some of the controls to be a little surprising, compared to a typical CD/DVD/video player. Here are the actions, their current icons, and a suggested icon that I think more people would expect:

    | Action | Current Icon | Expected Icon | Notes | |------|--------------|---------------|----------| | Auto Play | image | image | This is just a normal "play" operation | | Skip forward 10 | image | image | On audio/video controls this would be "fast forward" | | Jump to the end | image | image | On a CD player this would be "go to next track"; the vertical line represents the track separator. Here it might represent the "end". | | Single step | image | image | The double vertical bars imply "paused" |

    (the same apply to the reverse direction as well).

    References:

    • https://thediagram.com/17_4/correct.html
    • image
    Reviewed by JonathonReinhart at 2022-02-07 20:32
  • 4. Fix σ1 rotation and shift values

    The two rotations and shift for σ1 should be 17, 19 and 10 respectively. Instead, the explainer uses the same values as σ0. Likely a copy-paste bug. :)

    Reviewed by anandsuresh at 2022-02-08 01:44
  • 5. Minor issue with colours in the right shift

    Hi! Thanks a lot for the tool, it's really amazing.

    I spotted a minor issue with the colour of the text bleeding into the work XOR in step 2. I'm using Firefox 96.0 To reproduce:

    • Input This is a test input
    • Advance two steps
    • The R in XOR at the end of the line right shift 3 is red

    See the attached screenshot

    Screenshot_20220209_110024

    Thanks again!

    Reviewed by lgiordani at 2022-02-09 11:03
  • 6. Incorrect handling of hex input with odd length

    Hex input is interpreted incorrectly when an odd number of characters is used. For example, when fff is used as the input, it will cause the data to be 11111111 00001111.

    Hex input with an odd length should probably just be rejected. In any case, the current behavior doesn't really make sense and is also inconsistent with what happens when just 1 hex digit is used as an input (f for example is interpreted as 00001111, which kinda makes sense, but by that logic fff should be interpreted as 00001111 11111111, not 11111111 00001111).

    Reviewed by acut3 at 2022-04-05 09:55
  • 7. Incorrect instructions in step 0 with hex input

    There are two issues with the instructions displayed for step 0 when an hex input is used:

    1. Sub-step 1, where a single bit is added after the input data, is missing
    2. The message length used in the instructions is computed incorrectly. For example, for hex input "ff", message length is said to be 2 when it should be 8. Consequently, the numbers of zeroes to add is also stated incorrectly (445 when it should be 439)

    Note that it's only the instructions (in the leftmost column, under the message block) that are incorrect. Everything else is fine and the hash is computed correctly.

    Oh and thank you so much for this tool, it's brilliant!

    Reviewed by acut3 at 2022-04-05 09:46
  • 8. Feature Sugestion: Keyboard navigation

    @dmarman LOVE what you have done here!!!

    Congratulations, it's amazingly beautiful project and implementation, I'm learning and enjoying in the process.

    I only wanted to suggest you a new feature, which I think would help a lot... keyboard navigation!

    Using the keyboard to interact with the algorithm, like so:

    Play: SPACE (start/stop)
    
    Advance 1: right arrow
    Go Back 1: Left arrow
    
     Next 10: Up arrow
     Previous 10: Down arrow
    

    Anyway, thanks for doing this and sharing it with the world! AMAZING!

    Reviewed by josealgardataborges at 2022-02-25 09:25
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