Bump @bsv/sdk from 1.7.4 to 1.9.31

[dependabot]

Bumps @bsv/sdk from 1.7.4 to 1.9.31.

Changelog

Sourced from @​bsv/sdk's changelog.

[1.9.31] - 2025-12-29

Security

• Documented the use of table-based AES and AES-GCM implementations and their associated cache-timing considerations as part of a TOB-5 security review.
• Clarified that applications requiring strict side-channel resistance should use platform-native cryptography APIs or vetted constant-time libraries.

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[1.9.30] - 2025-12-18

Added

• Added constant-time scalar multiplication (mulCT) for elliptic curve points.
• Added comprehensive unit tests for constant-time scalar multiplication, including generator and non-generator points, negative scalars, and edge cases.
• Expanded test coverage across Point, ECDSA, PublicKey, and PrivateKey to validate correctness and edge-case behavior.

Changed

• Updated ECDSA signing to use constant-time scalar multiplication internally.
• Refactored elliptic curve scalar multiplication internals to improve timing consistency without changing public APIs.

Fixed

• Fixed incorrect handling of negative scalars during BigInt conversion in scalar multiplication.
• Corrected discrepancies between constant-time and variable-time scalar multiplication results.
• Ensured scalar multiplication by zero and point-at-infinity cases behave correctly and consistently.

Security

• Reduced timing side-channel risk in elliptic curve scalar multiplication paths by introducing constant-time algorithms (TOB-4).

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[1.9.29] - 2025-12-12

Added

• Introduced constantTimeEquals() utility for timing-safe byte comparisons.
• Added new unit tests covering constant-time comparison behavior, TOTP validation paths, and ProtoWallet HMAC verification.

Changed

• Updated TOTP validation logic to compare passcodes using constant-time comparison.
• Updated ProtoWallet HMAC verification to avoid string comparison and instead use constant-time byte comparison.

Fixed

• Ensured incorrect but same-length HMACs correctly fail validation through secure comparison logic.
• Fixed timing-side-channel vulnerability (TOB-8) where secrets and HMAC outputs were previously compared using ===.

Security

• Hardened TOTP and HMAC verification paths against timing attacks by replacing all secret-derived comparisons with constant-time equivalents.

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[1.9.28] - 2025-12-11

Added

... (truncated)

Commits

• See full diff in compare view

Maintainer changes

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[dependabot]

Superseded by #70.