OSPFv3 supports SHA1 authentication.
To authorize an authentication, use commands such as the following to configure shared secret keys for OSPFv3:
device(config)#ipv6 ospf authentication ipsec spi 400 esp sha1 1234567890abcde1234509876543211234567890
For more information on OSPFv3 authentication commands, refer to the Extreme NetIron Routing Configuration Guide.