58 lines
1.3 KiB
Ruby
58 lines
1.3 KiB
Ruby
#!/usr/bin/env ruby
|
|
|
|
require 'digest/sha1'
|
|
|
|
# helper to make a 'length' long string filled with 'byte'
|
|
def byte_string(byte, length)
|
|
([byte]*length).pack('C*')
|
|
end
|
|
|
|
def put_bytes(s)
|
|
s.unpack('C*').each { |x| print sprintf("%02d ",x); }
|
|
puts
|
|
end
|
|
|
|
# hmac algorithm - returns text version of hmac
|
|
def hmac(key, data, digest_object, blocksize)
|
|
# if key is too long, hash it
|
|
key = digest_object.digest(key) if key.size > blocksize
|
|
|
|
# pad key out to blocksize
|
|
key += byte_string(0,blocksize - key.size) if key.size < blocksize
|
|
|
|
# create pads
|
|
ipad = byte_string(0x36,blocksize)
|
|
opad = byte_string(0x5c,blocksize)
|
|
blocksize.times do |i|
|
|
#ipad[i] ^= key[i]
|
|
ipad.setbyte(i,ipad.getbyte(i) ^ key.getbyte(i))
|
|
#opad[i] ^= key[i] }
|
|
opad.setbyte(i,opad.getbyte(i) ^ key.getbyte(i))
|
|
end
|
|
|
|
puts "Key: "
|
|
put_bytes(key)
|
|
puts "data: "
|
|
put_bytes(data)
|
|
puts "ipad: "
|
|
put_bytes(ipad)
|
|
puts "opad: "
|
|
put_bytes(opad)
|
|
puts
|
|
puts "hash(ipad + data)"
|
|
puts digest_object.hexdigest(ipad+data)
|
|
puts
|
|
puts "hash(opad+hash(ipad+data))"
|
|
puts digest_object.hexdigest( opad + digest_object.digest( ipad + data ) )
|
|
|
|
# do the HMAC and return
|
|
digest_object.hexdigest( opad + digest_object.digest( ipad + data ) )
|
|
end
|
|
|
|
# hmac-sha1
|
|
def hmac_sha1(key, data)
|
|
hmac(key, data, Digest::SHA1, 64)
|
|
end
|
|
|
|
hmac_sha1('Jefe','what do ya want for nothing?');
|