Handle malformed KMS command output without panicking

[AnthonyRonning]

Summary

• parse kmstool output by its CIPHERTEXT and PLAINTEXT labels instead of indexing assumed lines
• return operation-specific errors for execution failures, nonzero responses, non-UTF-8 output, missing fields, malformed base64, and wrong random-byte lengths
• propagate enclave and OS randomness failures through seed and API-key generation instead of panicking

Testing

• nix develop -c cargo fmt --all -- --check
• nix develop -c cargo test encrypt::tests --locked (13 passed)
• nix develop -c cargo clippy --all-targets --all-features --locked -- -D warnings
• nix develop -c cargo test --all-targets --all-features --locked (221 passed, 16 database-dependent tests ignored)

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Review details

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: 2343fc52-09a1-4ec0-bb75-513746347111

📥 Commits

Reviewing files that changed from the base of the PR and between a3ecc93 and f2987a1.

📒 Files selected for processing (3)

• src/encrypt.rs
• src/private_key.rs
• src/web/protected_routes.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex-opensecret-kms-errors-opensecret

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

View in Devin Review to see 1 additional finding.