Is there anybody who knows how to generates the VENDOR_INFO string from the license key?

I meet a app that be protected by Flexlm , It use a license that have VENDOR_INFO and DIST_INFo stringI meet a app that be protected by Flexlm , It use a license that have VENDOR_INFO and DIST_INFo string Like this:
FEATURE FEATURE1 VENDORname 20051207 15-jan-2006 uncounted 53D5DD0FF467 \
VENDOR_STRING=3-DEMO-25-0-1-VM05120701 \
HOSTID=DISK_SERIAL_NUM=12345678 vendor_info="e650c7bb00e81d53" \
dist_info="d17b14a8b615e68cfe928f58fdefa251d38106bb6e33b54518cb1519b2eb424a"
FEATURE FEATURE2 VENDORname 20051207 15-jan-2006 uncounted 5C89B778DC77 \
VENDOR_STRING=3-DEMO-20-0-0-VM05120701 \
HOSTID=DISK_SERIAL_NUM=12345678 \
vendor_info="246b6b3146a892ee" \
dist_info="17eea625fcc8867b2df2aeb097af4996e689800caaa1c7fc5e5e0c5e2ceb42f4"
FEATURE FEATURE3 VENDORname 20051207 15-jan-2006 uncounted 369FA7270A06 \
VENDOR_STRING=3-DEMO-1-0-0-VM05120701 \
HOSTID=DISK_SERIAL_NUM=12345678 \
vendor_info="aba1dc03a7b16794" dist_info="12f9e3ff95437a244e592d8be6caf09cd4894eb6d39e956c13ae50ce2642dac1"

I can strip VENDOR_STRING from license line and generate a new license without problems.
But The VENDOR_INFO and DIST_INFo string maybe are accrording to(Feature,exp_date ,key,HOSTID),
if you just strip from license line and generate a new license ,
IT cann't work , and show "Future license file format or misspelling in license file"
.

nblender said "It use different algorithms for calculating the VENDOR_INFO field. The VENDOR_INFO field has to be update to match the license key.Using your favorite debuggger and disassembler, reverse the routine which matches the license key to the VENDOR_INFO string and make a keygen."

Is there anybody who knows how to locate the algorithms for calculating the VENDOR_INFO in the routine ?
who knows how to a keygen to generates the VENDOR_INFO string from the license key?