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Simplify diffie_hellman.py - #12541

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isidroas wants to merge 3 commits into
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isidroas:dh
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Simplify diffie_hellman.py#12541
isidroas wants to merge 3 commits into
TheAlgorithms:masterfrom
isidroas:dh

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@isidroas

@isidroas isidroas commented Jan 25, 2025 •
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Describe your change:

  • Add an algorithm?
  • Fix a bug or typo in an existing algorithm?
  • Add or change doctests? -- Note: Please avoid changing both code and tests in a single pull request.
  • Documentation change?

Checklist:

  • I have read CONTRIBUTING.md.
  • This pull request is all my own work -- I have not plagiarized.
  • I know that pull requests will not be merged if they fail the automated tests.
  • This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
  • All new Python files are placed inside an existing directory.
  • All filenames are in all lowercase characters with no spaces or dashes.
  • All functions and variable names follow Python naming conventions.
  • All function parameters and return values are annotated with Python type hints.
  • All functions have doctests that pass the automated testing.
  • All new algorithms include at least one URL that points to Wikipedia or another similar explanation.
  • If this pull request resolves one or more open issues then the description above includes the issue number(s) with a closing keyword: "Fixes #ISSUE-NUMBER".

@isidroas
simplified and refactor diffie_hellman.py
a65b346 
Everything is a refactor except the method generate_shared_key().
Its hashing final step has been removed for simplicity
@isidroas
Refactor doctest; change initializer arguments
bb987c4 
group: int -> prime: int, generator: int
@isidroas isidroas changed the title Dh Simplify diffie_hellman.py Jan 25, 2025
@isidroas
isidroas marked this pull request as draft January 25, 2025 12:51
@isidroas

isidroas commented Jan 25, 2025

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These are many unrelated changes. Let me know if I have to divide them into commits or PRs.

@isidroas
isidroas marked this pull request as ready for review January 25, 2025 12:56
@algorithms-keeper algorithms-keeper Bot added awaiting reviews This PR is ready to be reviewed enhancement This PR modified some existing files labels Jan 25, 2025
@isidroas

isidroas commented Jan 28, 2025

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The git history shows that the author is @ruppysuppy . Do these changes seem good to you?

Everything is a refactor except the method generate_shared_key(): its hashing final step has been removed for simplicity and because the key derivation is a separate problem.

ruppysuppy
ruppysuppy reviewed Jan 29, 2025
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@isidroas I am happy with the changes, but slightly unsure about this - my thoughts related to cryptography is a bit rusty (hadn't touched the topic in a while), so a brief explanation would be great

Comment thread ciphers/diffie_hellman.py
Comment on lines +194 to +195
Both parties should agree on the same public parameters
>>> bob = DiffieHellman(alice.prime, alice.generator)

@ruppysuppy ruppysuppy Jan 29, 2025 •
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Are we generating Bob's data using Alice's prime? Isn't the prime supposed to be private?

@isidroas isidroas Jan 30, 2025

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The only secret attribute is each self.__private_key, which does not necessarily have to be a prime number. In cryptography it is strange that more than one parameter must be kept secret.

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isidroas commented Jan 30, 2025

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Thank you for the feedback @ruppysuppy ! I added a bit of documentation in 93c7ac0

@cclauss cclauss mentioned this pull request Sep 13, 2026
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