Demonstration of creating 8 byte tags using ASCON Psuedo-Random Function Short
Note that the ASCON PRF "short" form means:
- length of input <= 16 bytes
- length of tag <= 16 bytes.
Demonstration of ASCON-PRFS key (hex) : 000102030405060708090a0b0c0d0e0f base msg (hex) : 4379636c6f6e65733230323421000000 ........................................................... base msg (ascii) : [Cyclones2024!] note: the last three bytes of the base message are updated with a nonce value and then a tag generated. nonce msg (w/nonce) tag ------------------ -------------------------------- ----------------- 1000 (0x0003e8) 4379636c6f6e657332303234210003e8 51eef9b8733a73fb 20000 (0x004e20) 4379636c6f6e65733230323421004e20 ab4ad516d465047e 100000 (0x0186a0) 4379636c6f6e657332303234210186a0 6b96250a86382ac7 1000000 (0x0f4240) 4379636c6f6e657332303234210f4240 c11cdd72b7deead1
int ret = crypto_prf(tag, 8, msg, 16, key);
^ ^ ^
output ──────────┘ │ └─── length of message
length of tag ───────┘