どう使うのか解りません

ecc.rb

def mv(key,nn)
print "in mv\n"
init_curve(nn)
mktable(@CRV_G_x,@CRV_G_y)
ellip(key)
print "Pubkey_x=",@Pub_key_x,"\n"
print "Pubkey_y=",@Pub_key_y,"\n"


#command = { 'e' => 0, 'd' => 1}[(ARGV[0]||'').strip.downcase]
#data    = ARGV[1] && IO.read(ARGV[1])
#print "argv1=",ARGF.filename,"\n"

require 'securerandom'

  f = File.open(ARGF.filename,"rb")
  g = File.open(ARGF.filename + ".ecc","wb")
#=begin
int=0

  salt=SecureRandom.random_number(2**(32*8)) 
#  salt=[OpenSSL::Random.random_bytes(32)].pack("m")
#  salt.each_byte{|c| int=(int<<8)^c}
#  salt=int
print "salt=",salt,"\n"

  mktable(@Pub_key_x,@Pub_key_y)
  ellip(salt)
  print "salt*Pubkey_x=",@Pub_key_x,"\n"
  print "salt*Pubkey_y=",@Pub_key_y,"\n"
  @Gen_key_x=@Pub_key_x
  @Gen_key_y=@Pub_key_y
for i in 0..10000
  @I[i]=0
end
ii=0
  mktable(@CRV_G_x,@CRV_G_y)
  ellip(salt)
#=end
  while((str=f.read(32))!=nil)
    @I[ii]=str.size
    ii=ii+1
    c=0
    i=0
    salt=0
    str.each_byte{|c| salt=(salt<<8)^c}
    #print "length=",str.split(//s).length,"\n"
    eadd(@Gen_key_x,@CRV_G_x,@Gen_key_y,@CRV_G_y,@CRV_p)
    salt^=(@T_y%(2**8*str.size))
    @Gen_key_x=@T_x
    @Gen_key_y=@T_y
=begin
    # 巨大な数 salt をバイトごとの配列に変換(packが使えないので原始的に)
    bytes = []
    while salt > 0
    salt, byte = salt >> 8, salt & 0xff
    bytes.unshift(byte) # 望むエンディアネスによっては push かも。
    end
    # バイトの配列をバイト文字列として書き出す
    open(ARGF.filename + ".ecc", 'wb') {|out| out.print(bytes.pack('C*')) } 
=end
    g.write(salt)
    g.write("\n")
  end


  f.close
  g.close

end



def dec(key,nn)
print "in mv\n"
init_curve(nn)
mktable(@Pub_key_x,@Pub_key_y)
ellip(key)
print "dcPubkey_x=",@Pub_key_x,"\n"
print "dcPubkey_y=",@Pub_key_y,"\n"
salt=[32]


#OpenSSL::Random.random_bytes(32)

#print "salt=",salt,"\n"
command = { 'e' => 0, 'd' => 1}[(ARGV[0]||'').strip.downcase]
data    = ARGV[1] && IO.read(ARGV[1])

  g = File.open(ARGF.filename + ".txt","wb")
  f = File.open(ARGF.filename + ".ecc","rb")
  lines = fields = 0
ii=0



open(ARGF.filename + ".ecc") {|file|
  while l = file.gets
	l=l.to_i
	ls=@I[ii]
	ii=ii+1

=begin
value = 0
# バイナリデータを読み込んでバイト列に分解
raw = open(ARGF.filename + ".ecc"){|f| f.read.unpack('C*')}
  # 数を復元
  until raw.empty?
    value = (value << 8) + raw.shift
  end 
l=value
=end

#print "l=",ls,"\n"
    eadd(@Pub_key_x,@CRV_G_x,@Pub_key_y,@CRV_G_y,@CRV_p)
    @Pub_key_x=@T_x
    @Pub_key_y=@T_y
    lines += 1
    fields += l.to_s.split(',').size
    l^=(@T_y%(2**8*ls))
    for i in 0..31
	salt[i]=0
    end
    while(l>0)
      i=0
      while(i<ls)
        salt[i]=l&0xff
        salt[i]=sprintf("%c",salt[i])
        l=(l>>8)
        i=i+1
      end
    end
	i=ls-1
	while(i>-1)
          g.write(salt[i])
	  i=i-1
	end
  end
}
puts "Total #{lines} lines, #{fields} fields"

    #print "length=",str.split(//s).length,"\n"

  f.close
  g.close

end