feat(pbkdf2): allow use of int64

[james-d-elliott]

Summary by CodeRabbit

• New Features
  • Added KeyExtended function for PBKDF2 key derivation with extended support for larger iteration counts and key lengths.

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[coderabbitai]

Caution

Review failed

The pull request is closed.

📝 Walkthrough

Walkthrough

A new KeyExtended function was added to the pbkdf2 package, accepting int64-based parameters for iteration count and key length. The existing Key function now delegates to KeyExtended, and internal arithmetic throughout the implementation was migrated from 32-bit to 64-bit types for consistency.

Changes

Cohort / File(s)	Summary
PBKDF2 Function Refactoring pbkdf2/pbkdf2.go	Added new exported function KeyExtended with int64 parameters; refactored existing Key function to delegate to it; migrated internal loop counters, block indexing, and slice offset calculations from 32-bit to 64-bit arithmetic

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

Poem

🐰 A leap from thirty-two to sixty-four,
Where keys are stretched and lengths explore,
New pathways branch, old trails remain,
The crypto dance continues its refrain! 🔐

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat-pbkdf2-int64

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📜 Recent review details

Configuration used: defaults

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 7e69a34 and ce2af19.

📒 Files selected for processing (1)

• pbkdf2/pbkdf2.go

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