Signing fix

[yanivmo]

No description provided.

[Copilot]

Pull request overview

This PR refactors the signing and encoding modules to use Buffer objects instead of strings for binary data, improving type safety and correctness in cryptographic operations.

Changes:

• Updated signature interfaces to accept and return Buffer objects instead of strings
• Modified encoding functions to work with Buffer inputs and outputs
• Replaced string-based signature comparison with timing-safe equality check

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
v2/api-validator/src/security/signing.ts	Changed signature methods to use Buffer types and added timing-safe comparison for HMAC verification
v2/api-validator/src/security/encoding.ts	Updated encoder interface and implementations to accept Buffer inputs and return Buffer outputs
v2/api-validator/src/security/index.ts	Modified payload encoding to explicitly convert strings to UTF-8 buffers before encoding
v2/api-validator/tests/self-tests/encoding.test.ts	Updated test data to use Buffer and changed assertions to use buffer equality checks
v2/api-validator/tests/self-tests/signing.test.ts	Fixed test to pass Buffer instead of string for signature parameter

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