[PM-13420] Support case-insensitive TOTP generation

[dani-garcia]

🎟️ Tracking

https://bitwarden.atlassian.net/browse/PM-13420

📔 Objective

Update TOTP parsing to be case insensitive by lowercasing the input initially. decode_b32 is already converting the input to uppercase so secret decoding will still work the same.

I've also removed the to_uppercase from algorithm now that we know the string is lowercase.

⏰ Reminders before review

• Contributor guidelines followed
• All formatters and local linters executed and passed
• Written new unit and / or integration tests where applicable
• Protected functional changes with optionality (feature flags)
• Used internationalization (i18n) for all UI strings
• CI builds passed
• Communicated to DevOps any deployment requirements
• Updated any necessary documentation (Confluence, contributing docs) or informed the documentation
  team

🦮 Reviewer guidelines

• 👍 (:+1:) or similar for great changes
• 📝 (:memo:) or ℹ️ (:information_source:) for notes or general info
• ❓ (:question:) for questions
• 🤔 (:thinking:) or 💭 (:thought_balloon:) for more open inquiry that's not quite a confirmed
  issue and could potentially benefit from discussion
• 🎨 (:art:) for suggestions / improvements
• ❌ (:x:) or ⚠️ (:warning:) for more significant problems or concerns needing attention
• 🌱 (:seedling:) or ♻️ (:recycle:) for future improvements or indications of technical debt
• ⛏ (:pick:) for minor or nitpick changes

[github-actions]

Checkmarx One – Scan Summary & Details – 20f30931-6fb1-4f59-ae1c-0d599a3595ec

Fixed Issues

Severity	Issue	Source File / Package
	Missing_HSTS_Header	/languages/php/example.php: 3
	Parameter_Tampering	/languages/kotlin/app/src/main/java/com/bitwarden/myapplication/MainActivity.kt: 384
	Privacy_Violation	/languages/java/src/main/java/com/bitwarden/sdk/BitwardenClient.java: 43
	Privacy_Violation	/languages/java/example/Example.java: 46
	Privacy_Violation	/languages/java/src/main/java/com/bitwarden/sdk/BitwardenClient.java: 43
	Privacy_Violation	/languages/java/src/main/java/com/bitwarden/sdk/BitwardenClient.java: 43
	Privacy_Violation	/languages/java/src/main/java/com/bitwarden/sdk/BitwardenClient.java: 43
	Privacy_Violation	/languages/java/src/main/java/com/bitwarden/sdk/BitwardenClient.java: 43
	Privacy_Violation	/languages/java/src/main/java/com/bitwarden/sdk/SecretsClient.java: 41
	Privacy_Violation	/languages/java/src/main/java/com/bitwarden/sdk/SecretsClient.java: 41
	Privacy_Violation	/languages/java/src/main/java/com/bitwarden/sdk/SecretsClient.java: 138
	Privacy_Violation	/languages/java/example/Example.java: 43
	Privacy_Violation	/languages/java/src/main/java/com/bitwarden/sdk/SecretsClient.java: 20
	Privacy_Violation	/languages/java/example/Example.java: 53
	Privacy_Violation	/languages/cpp/src/BitwardenClient.cpp: 159
	Privacy_Violation	/languages/cpp/src/BitwardenClient.cpp: 129
	Privacy_Violation	/languages/cpp/src/BitwardenClient.cpp: 115
	Privacy_Violation	/languages/cpp/src/BitwardenClient.cpp: 159
	Privacy_Violation	/languages/cpp/src/BitwardenClient.cpp: 115
	Privacy_Violation	/languages/cpp/src/BitwardenClient.cpp: 151
	Privacy_Violation	/languages/cpp/src/BitwardenClient.cpp: 129
	Privacy_Violation	/languages/cpp/src/BitwardenClient.cpp: 159
	Privacy_Violation	/languages/cpp/src/Secrets.cpp: 56
	Privacy_Violation	/languages/cpp/src/BitwardenClient.cpp: 151
	Privacy_Violation	/languages/cpp/src/BitwardenClient.cpp: 129
	Privacy_Violation	/languages/cpp/src/BitwardenClient.cpp: 159
	Privacy_Violation	/languages/cpp/src/Secrets.cpp: 139
	Privacy_Violation	/languages/cpp/src/BitwardenClient.cpp: 122
	Privacy_Violation	/languages/cpp/src/BitwardenClient.cpp: 115
	Privacy_Violation	/languages/cpp/src/BitwardenClient.cpp: 151
	Privacy_Violation	/languages/cpp/src/BitwardenClient.cpp: 129
	Privacy_Violation	/languages/cpp/src/BitwardenClient.cpp: 159
	Privacy_Violation	/languages/cpp/src/Secrets.cpp: 107
	Privacy_Violation	/languages/cpp/src/BitwardenClient.cpp: 159
	Privacy_Violation	/languages/cpp/src/BitwardenClient.cpp: 136
	Privacy_Violation	/languages/cpp/src/BitwardenClient.cpp: 122
	Privacy_Violation	/languages/cpp/src/BitwardenClient.cpp: 151
	Privacy_Violation	/languages/cpp/src/BitwardenClient.cpp: 129

[codecov]

Codecov Report

Attention: Patch coverage is 96.96970% with 1 line in your changes missing coverage. Please review.

Project coverage is 58.30%. Comparing base (8aea2e9) to head (0ddf765).
Report is 9 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/bitwarden-vault/src/totp.rs	96.96%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1144      +/-   ##
==========================================
+ Coverage   58.17%   58.30%   +0.12%     
==========================================
  Files         197      197              
  Lines       13587    13614      +27     
==========================================
+ Hits         7904     7937      +33     
+ Misses       5683     5677       -6     

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