Module ascon 

Ascon lightweight cryptography (NIST SP 800-232)

Ascon is a family of authenticated encryption and hashing algorithms selected by NIST for constrained environments. This module provides the four NIST-standardized, little-endian variants:

• AsconAead128 — authenticated encryption with associated data (AEAD)
• AsconHash256 — 256-bit cryptographic hash function
• AsconXof128 — extensible-output function (XOF)
• AsconCxof128 — customizable XOF (accepts a customization string)

With optimized versions for both 32-bit and 64-bit CPUs.

Usage limits

Per NIST SP 800-232 §4.3:

• Max data per key: 2^54 bytes
• Nonces must be distinct per key (up to 2^8 repetitions tolerated)
• Tag lengths below 64 bits are discouraged; below 32 bits are not allowed

Structs

AsconAead128

Ascon-AEAD128 authenticated encryption with associated data (NIST SP 800-232).

AsconCxof128

Ascon-CXOF128 customizable extensible-output function (NIST SP 800-232 §5.3).

AsconHash256

Ascon-Hash256 cryptographic hash function (NIST SP 800-232 §5.1).

AsconXof128

Ascon-XOF128 extensible-output function (NIST SP 800-232 §5.2).