Documentation
# DES-CFB
# From FIPS Pub 81 Appendix D3


# CFB-DES.Encrypt and CFB-DES.Decrypt 
Klen = 8
Ilen = 8
Len = 24
Key = 0123456789abcdef
IV = 1234567890abcdef
#Plaintext = "Now is the time for all "
Plaintext = 4e6f77206973207468652074696d6520666f7220616c6c20
Ciphertext = f3096249c7f46e51a69e839b1a92f78403467133898ea622