USAGI IPsec

Completely reworked
generic SAD/SPD
pluggable cryptographic / digesting / compression algorithms
cryptoapi
DES-CBC, 3DES-CES, AES-CEC, NULL
HMAC-MD5, HMAC-SHA1
Deflate
FreeS/WAN compatible kernel interface
Tunnel Mode
using standard tunnel device
Conforming well to specification