Feat/noble ecies replacement

[ieow]

Motivation and Context

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Description

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Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My code follows the code style of this project. (run lint)
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.
• My code requires a db migration.

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Note

Introduces a Noble-based ECIES path alongside existing eccrypto.

• Adds src/nobleEncryption.ts implementing nobleEncrypt/nobleDecrypt (ECDH via @noble/secp256k1, KDF with sha512, AES-CBC via @noble/ciphers, HMAC-SHA256 for MAC) plus helpers to convert between NobleEcies and existing Ecies, and thin encrypt/decrypt wrappers
• Extends tests (test/encrypt_decrypt.spec.ts) to verify interoperability and equivalence between Noble-based and existing implementations, including MAC/padding behavior and conversions
• Adds dependencies: @noble/secp256k1, @noble/ciphers, @noble/hashes

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[chaitanyapotti]

Copy from industry lib:
https://github.com/soatok/elliptic-to-noble/blob/main/index.js

[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

[cursor]

Noble uses wrong shared secret format causing incompatibility

High Severity

The getSharedSecret call returns the full uncompressed point (65 bytes: 0x04 | X | Y), and slice(1) yields 64 bytes (X | Y). However, the existing eccrypto implementation uses only the X coordinate (~32 bytes) from derive(). Hashing 64 bytes vs 32 bytes produces completely different encryption keys and MACs, making the noble implementation incompatible with the existing one. The test expecting convertedEcies to equal encrypted would fail.

Additional Locations (1)

• src/nobleEncryption.ts#L92-L95