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Implement secure OS-backed secret storage

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Hermes Agent
2026-08-10 00:23:40 +00:00
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DEPENDENCIES.md
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@@ -48,7 +48,7 @@ decision.
| GnuPG integration | [`gpgme` 0.11](https://crates.io/crates/gpgme/0.11.0) | LGPL-2.1 | Reject: native GPGME/GnuPG integration and GPG engine processes violate the portability and no-process requirements. |
| Local Git plus HTTPS fetch/push | [`gix` 0.86](https://crates.io/crates/gix/0.86.0) | MIT OR Apache-2.0 | Selected with default features off and `blocking-http-transport-reqwest-rust-tls`; accept HTTPS remotes only, supply credentials directly, and use the storage-owned receive-pack implementation for push. |
| Git FFI fallback | [`git2` 0.21](https://crates.io/crates/git2/0.21.0) | MIT OR Apache-2.0 | Reject for now; it links libgit2 and is unnecessary for the HTTPS-only scope. |
| Server/application credentials | [`keyring-core` 1.0](https://crates.io/crates/keyring-core/1.0.0), [`apple-native-keyring-store`](https://crates.io/crates/apple-native-keyring-store/1.0.2), [`windows-native-keyring-store`](https://crates.io/crates/windows-native-keyring-store/1.1.0), [`zbus-secret-service-keyring-store`](https://crates.io/crates/zbus-secret-service-keyring-store/1.0.0) | MIT OR Apache-2.0 | Preferred per-platform stores. The Apple protected store supports iOS/macOS protected data and biometric access. Use the Linux store's Rust crypto feature. |
| Server/application credentials | [`keyring-core` 1.0](https://crates.io/crates/keyring-core/1.0.0), [`apple-native-keyring-store` 1.0](https://crates.io/crates/apple-native-keyring-store/1.0.2), [`windows-native-keyring-store` 1.1](https://crates.io/crates/windows-native-keyring-store/1.1.0), [`zbus-secret-service-keyring-store` 1.0](https://crates.io/crates/zbus-secret-service-keyring-store/1.0.0) | MIT OR Apache-2.0 | Selected behind target-specific dependencies. Apple supports legacy Keychain plus protected-data user presence, Windows uses Credential Manager, and Linux uses Secret Service with the Tokio/Rust-crypto feature. |
| Secret values in memory | [`secrecy` 0.10](https://crates.io/crates/secrecy/0.10.3), [`zeroize` 1.9](https://crates.io/crates/zeroize/1.9.0) | MIT OR Apache-2.0 | `zeroize` selected for the storage-owned redacted byte type; consider `secrecy` only when typed exposure controls add value. |
| Password generation | [`rand`](https://crates.io/crates/rand) | MIT OR Apache-2.0 | Preferred using the operating-system CSPRNG. |
| TOTP and HOTP | [`hmac`](https://crates.io/crates/hmac), [`sha1`](https://crates.io/crates/sha1), [`sha2`](https://crates.io/crates/sha2), [`data-encoding`](https://crates.io/crates/data-encoding), [`url`](https://crates.io/crates/url) | MIT or MIT OR Apache-2.0 | Preferred small implementation with RFC test vectors. `totp-rs` is MIT but rejects HOTP URIs, so it cannot cover all of `pass-otp`. |