Add Ascon (NIST SP 800-232) operations: Hash, MAC, Encrypt, Decrypt

[thomasxm]

Summary

Adds support for Ascon lightweight cryptography operations as standardised in NIST SP 800-232.

New Operations

• Ascon Hash - 256-bit cryptographic hash (Ascon-Hash256)
• Ascon MAC - 128-bit message authentication code
• Ascon Encrypt - AEAD encryption (Ascon-AEAD128)
• Ascon Decrypt - AEAD decryption with authentication

Technical Details

• Uses js-ascon library (implements NIST SP 800-232)
• Key/Nonce: 16 bytes (128 bits) for encrypt/decrypt
• Tag: 128-bit authentication tag included in ciphertext
• Test vectors from official NIST ACVP test suite

Files Changed

File	Change
package.json	Added js-ascon dependency
src/core/operations/AsconHash.mjs	New
src/core/operations/AsconMAC.mjs	New
src/core/operations/AsconEncrypt.mjs	New
src/core/operations/AsconDecrypt.mjs	New
src/core/vendor/ascon.mjs	New (MAC implementation)
src/core/config/Categories.json	Added to Hashing/Encryption menus
tests/operations/tests/Ascon.mjs	New (lots test cases)

Testing

• All tests pass (Official test vectors from ascon-c: https://github.com/ascon/ascon-c/blob/main/)
• Verified against official NIST ACVP test vectors
• Round-trip encryption/decryption tested
• Error handling for invalid inputs tested

References

• NIST SP 800-232
• Ascon Wikipedia
• NIST ACVP Test Vectors

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