Potential fix for code scanning alert no. 84: Insecure randomness#279
Potential fix for code scanning alert no. 84: Insecure randomness#279
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Reviewer's guide (collapsed on small PRs)Reviewer's GuideThis PR updates the DappTransport.generateId() implementation to replace Math.random()-based ID suffix generation with a cryptographically secure random value sourced from window.crypto.getRandomValues, addressing a code scanning alert for insecure randomness. Sequence diagram for secure ID generation in DappTransport.generateIdsequenceDiagram
participant DappTransport
participant WindowCrypto as window_crypto
participant Uint32Array as Uint32Array_instance
DappTransport->>Uint32Array: create Uint32Array(1)
DappTransport->>WindowCrypto: getRandomValues(Uint32Array_instance)
WindowCrypto-->>DappTransport: filled Uint32Array_instance
DappTransport->>DappTransport: randStr = Uint32Array_instance[0].toString(36).padStart(7, '0')
DappTransport->>DappTransport: id = Date.now().toString(36) + "-" + randStr
DappTransport-->>DappTransport: return id
Class diagram for updated DappTransport.generateId implementationclassDiagram
class DappTransport {
+generateId() string
}
class WindowCrypto {
+getRandomValues(typedArray Uint32Array) Uint32Array
}
class Uint32Array {
+Uint32Array(length number)
+get(index number) number
+set(index number, value number) void
}
DappTransport ..> WindowCrypto : uses
DappTransport ..> Uint32Array : uses
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Summary of ChangesHello @Dargon789, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request implements a critical security fix by upgrading the random number generation mechanism used for creating unique identifiers. It transitions from a standard, potentially predictable Highlights
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Code Review
This pull request correctly addresses the 'Insecure randomness' security alert by replacing Math.random() with the cryptographically secure window.crypto.getRandomValues. The implementation is sound. I've added one suggestion to ensure the generated random string has a fixed length, which makes it more consistent with the previous implementation and avoids potential (though unlikely) collisions.
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Hey - I've left some high level feedback:
- Directly accessing
window.cryptoingenerateId()will throw in non-browser or server-side contexts; consider usingglobalThis.cryptowith a graceful fallback (or an environment check) to avoid runtime errors. - It might be worth handling the rare case where
crypto.getRandomValuesis unavailable or fails (e.g. older browsers or restricted environments) so thatgenerateId()still behaves predictably rather than throwing.
Prompt for AI Agents
Please address the comments from this code review:
## Overall Comments
- Directly accessing `window.crypto` in `generateId()` will throw in non-browser or server-side contexts; consider using `globalThis.crypto` with a graceful fallback (or an environment check) to avoid runtime errors.
- It might be worth handling the rare case where `crypto.getRandomValues` is unavailable or fails (e.g. older browsers or restricted environments) so that `generateId()` still behaves predictably rather than throwing.Help me be more useful! Please click 👍 or 👎 on each comment and I'll use the feedback to improve your reviews.
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Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com> Signed-off-by: Dargon789 <64915515+Dargon789@users.noreply.github.com>
Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com> Signed-off-by: Dargon789 <64915515+Dargon789@users.noreply.github.com>
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Potential fix for https://github.com/Dargon789/sequence.js/security/code-scanning/84
To fix this problem, the generation of identifiers within
generateId()(specifically the random component) must use a cryptographically secure random number generator. For browser environments, the correct API iswindow.crypto.getRandomValues, which returns a cryptographically secure random number. Replace the use ofMath.random()with a string derived from secure random bytes, e.g., converting a Uint8Array (or Uint32Array) to a base36 string.Edit the
generateId()implementation inpackages/wallet/dapp-client/src/DappTransport.tsso that instead of usingMath.random(), it creates a random value by callingwindow.crypto.getRandomValues, then builds the ID string using this random value. No new imports are needed since the browserwindow.cryptois already available.Suggested fixes powered by Copilot Autofix. Review carefully before merging.
Summary by Sourcery
Bug Fixes: