Bump curve25519-dalek from 4.1.2 to 4.1.3

[dependabot[bot]]

Bumps curve25519-dalek from 4.1.2 to 4.1.3.

Commits

• 5312a03 curve: Bump version to 4.1.3 (#660)
• b4f9e4d SECURITY: fix timing variability in backend/serial/u32/scalar.rs (#661)
• 415892a SECURITY: fix timing variability in backend/serial/u64/scalar.rs (#659)
• 56bf398 Updates license field to valid SPDX format (#647)
• 9252fa5 Mitigate check-cfg until MSRV 1.77 (#652)
• 1efe6a9 Fix a minor typo in signing.rs (#649)
• cc3421a Indicate that the rand_core feature is required (#641)
• 858c4ca Address new nightly clippy unnecessary qualifications (#639)
• 31ccb67 Remove platforms in favor using CARGO_CFG_TARGET_POINTER_WIDTH (#636)
• 19c7f4a Fix new nightly redundant import lint warns (#638)
• Additional commits viewable in compare view

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[github-actions[bot]]

[puLL-Merge] - dalek-cryptography/curve25519-dalek@curve25519-4.1.2..curve25519-4.1.3

Description

This pull request introduces several changes focused on code maintenance and optimization for the curve25519-dalek library. It primarily aims to fix a security timing leak, update the license format, improve code organization, clean unnecessary imports, and provide additional methods for enhanced functionality.

Security Hotspots

1. Timing Leak Fixes:

   • File: curve25519-dalek/src/backend/serial/u32/scalar.rs, curve25519-dalek/src/backend/serial/u64/scalar.rs
   • Details: Changes include the use of an optimization barrier (black_box) to prevent the compiler from inserting branch instructions. This is intended to mitigate timing attacks. The use of black_box here should be reviewed carefully to ensure it effectively provides constant-time operations.

2. Environment Variable Handling:

   • File: curve25519-dalek/build.rs
   • Details: Enhanced handling of environment variables with clear warnings and error messages. While these changes improve robustness, they should be validated to ensure no unintended information leakage occurs through environment variables.

Changes

### Changes #### `curve25519-dalek-derive/Cargo.toml` - Updated the license format to "MIT OR Apache-2.0" for better SPDX conformance. #### `curve25519-dalek-derive/tests/tests.rs` - Removed functions and tests under the `#[cfg(feature = "dummy")]` configuration, which are no longer used. #### `curve25519-dalek/CHANGELOG.md` - Added entries for version `4.1.3`, documenting a security fix for timing leaks and the resolution of assorted warnings and lints. #### `curve25519-dalek/Cargo.toml` - Updated package version from `4.1.2` to `4.1.3`. - Removed `platforms` as a build dependency. #### `curve25519-dalek/build.rs` - Added a `Display` implementation for `DalekBits` for improved logging. - Reorganized the code to fetch the `target_arch` before backend determination. - Refactored `determine_curve25519_dalek_bits` to accept `target_arch` and adjusted error messages for clarity. #### `curve25519-dalek/src/backend/mod.rs` - Simplified path imports by removing redundant `self::`. #### `curve25519-dalek/src/backend/serial/curve_models/mod.rs` - Simplified `Debug` implementations by removing `::core::` prefix. #### `curve25519-dalek/src/backend/serial/fiat_u32/field.rs` - Improved `Debug` implementation. #### `curve25519-dalek/src/backend/serial/fiat_u64/field.rs` - Improved `Debug` implementation. #### `curve25519-dalek/src/backend/serial/scalar_mul/pippenger.rs` - Removed unused import. #### `curve25519-dalek/src/backend/serial/u32/field.rs` - Improved `Debug` implementation. #### `curve25519-dalek/src/backend/serial/u32/scalar.rs` - Added `black_box` function to ensure the subtraction operation is constant-time. #### `curve25519-dalek/src/backend/serial/u64/field.rs` - Improved `Debug` implementation. #### `curve25519-dalek/src/backend/serial/u64/scalar.rs` - Added `black_box` function to ensure the subtraction operation is constant-time. #### `curve25519-dalek/src/backend/vector/avx2/edwards.rs` - Removed unused import. #### `curve25519-dalek/src/edwards.rs` - Cleaned up unnecessary imports and simplified `Debug` implementations. #### `curve25519-dalek/src/field.rs` - Cleaned up unnecessary imports. #### `curve25519-dalek/src/lib.rs` - Added `allow(unexpected_cfgs)` attribute for compatibility with latest code. #### `curve25519-dalek/src/ristretto.rs` - Improved `Debug` implementations and cleaned up Serde imports. #### `curve25519-dalek/src/scalar.rs` - Cleaned up unnecessary imports and improved `Debug` implementations. #### `curve25519-dalek/src/traits.rs` - Cleaned up unnecessary imports and ensured the `ValidityCheck` trait is properly contained. #### `curve25519-dalek/src/window.rs` - Improved `Debug` implementations. #### `ed25519-dalek/README.md` - Minor grammatical fixes in the README file. #### `ed25519-dalek/src/batch.rs` - Removed unused import. #### `ed25519-dalek/src/lib.rs` - Added inline comment for documentation. #### `ed25519-dalek/src/signature.rs` - Removed unnecessary import and improved `Debug` implementations. #### `ed25519-dalek/src/signing.rs` - Minor code cleanup and improved `Debug` implementations. #### `ed25519-dalek/src/verifying.rs` - Provided methods for the Edwards point conversion and improved `Debug` implementations. #### `ed25519-dalek/tests/ed25519.rs` - Added a test to verify the conversion between Edwards and Montgomery points. #### `x25519-dalek/src/lib.rs` - Removed an unnecessary feature attribute.

[dependabot[bot]]

Looks like curve25519-dalek is up-to-date now, so this is no longer needed.

[rillian]

@dependabot retry?