Class: OTP

Inherits:
Object
  • Object
show all
Defined in:
lib/otp.rb

Constant Summary collapse

VERSION = 
"0.2"
WORDS = 
%w{A ABE ACE ACT AD ADA ADD AGO AID AIM AIR ALL ALP AM AMY AN ANA AND ANN ANT ANY APE APS
APT ARC ARE ARK ARM ART AS ASH ASK AT ATE AUG AUK AVE AWE AWK AWL AWN AX AYE BAD BAG BAH BAM
BAN BAR BAT BAY BE BED BEE BEG BEN BET BEY BIB BID BIG BIN BIT BOB BOG BON BOO BOP BOW BOY BUB
BUD BUG BUM BUN BUS BUT BUY BY BYE CAB CAL CAM CAN CAP CAR CAT CAW COD COG COL CON COO COP COT
COW COY CRY CUB CUE CUP CUR CUT DAB DAD DAM DAN DAR DAY DEE DEL DEN DES DEW DID DIE DIG DIN DIP
DO DOE DOG DON DOT DOW DRY DUB DUD DUE DUG DUN EAR EAT ED EEL EGG EGO ELI ELK ELM ELY EM END
EST ETC EVA EVE EWE EYE FAD FAN FAR FAT FAY FED FEE FEW FIB FIG FIN FIR FIT FLO FLY FOE FOG FOR
FRY FUM FUN FUR GAB GAD GAG GAL GAM GAP GAS GAY GEE GEL GEM GET GIG GIL GIN GO GOT GUM GUN GUS
GUT GUY GYM GYP HA HAD HAL HAM HAN HAP HAS HAT HAW HAY HE HEM HEN HER HEW HEY HI HID HIM HIP
HIS HIT HO HOB HOC HOE HOG HOP HOT HOW HUB HUE HUG HUH HUM HUT I ICY IDA IF IKE ILL INK INN
IO ION IQ IRA IRE IRK IS IT ITS IVY JAB JAG JAM JAN JAR JAW JAY JET JIG JIM JO JOB JOE JOG
JOT JOY JUG JUT KAY KEG KEN KEY KID KIM KIN KIT LA LAB LAC LAD LAG LAM LAP LAW LAY LEA LED LEE
LEG LEN LEO LET LEW LID LIE LIN LIP LIT LO LOB LOG LOP LOS LOT LOU LOW LOY LUG LYE MA MAC MAD
MAE MAN MAO MAP MAT MAW MAY ME MEG MEL MEN MET MEW MID MIN MIT MOB MOD MOE MOO MOP MOS MOT MOW
MUD MUG MUM MY NAB NAG NAN NAP NAT NAY NE NED NEE NET NEW NIB NIL NIP NIT NO NOB NOD NON NOR
NOT NOV NOW NU NUN NUT O OAF OAK OAR OAT ODD ODE OF OFF OFT OH OIL OK OLD ON ONE OR ORB
ORE ORR OS OTT OUR OUT OVA OW OWE OWL OWN OX PA PAD PAL PAM PAN PAP PAR PAT PAW PAY PEA PEG
PEN PEP PER PET PEW PHI PI PIE PIN PIT PLY PO POD POE POP POT POW PRO PRY PUB PUG PUN PUP PUT
QUO RAG RAM RAN RAP RAT RAW RAY REB RED REP RET RIB RID RIG RIM RIO RIP ROB ROD ROE RON ROT ROW
ROY RUB RUE RUG RUM RUN RYE SAC SAD SAG SAL SAM SAN SAP SAT SAW SAY SEA SEC SEE SEN SET SEW SHE
SHY SIN SIP SIR SIS SIT SKI SKY SLY SO SOB SOD SON SOP SOW SOY SPA SPY SUB SUD SUE SUM SUN SUP
TAB TAD TAG TAN TAP TAR TEA TED TEE TEN THE THY TIC TIE TIM TIN TIP TO TOE TOG TOM TON TOO TOP
TOW TOY TRY TUB TUG TUM TUN TWO UN UP US USE VAN VAT VET VIE WAD WAG WAR WAS WAY WE WEB WED
WEE WET WHO WHY WIN WIT WOK WON WOO WOW WRY WU YAM YAP YAW YE YEA YES YET YOU ABED ABEL ABET ABLE
ABUT ACHE ACID ACME ACRE ACTA ACTS ADAM ADDS ADEN AFAR AFRO AGEE AHEM AHOY AIDA
AIDE AIDS AIRY AJAR AKIN ALAN ALEC ALGA ALIA ALLY ALMA ALOE ALSO ALTO ALUM ALVA
AMEN AMES AMID AMMO AMOK AMOS AMRA ANDY ANEW ANNA ANNE ANTE ANTI AQUA ARAB ARCH
AREA ARGO ARID ARMY ARTS ARTY ASIA ASKS ATOM AUNT AURA AUTO AVER AVID AVIS AVON
AVOW AWAY AWRY BABE BABY BACH BACK BADE BAIL BAIT BAKE BALD BALE BALI BALK BALL
BALM BAND BANE BANG BANK BARB BARD BARE BARK BARN BARR BASE BASH BASK BASS BATE
BATH BAWD BAWL BEAD BEAK BEAM BEAN BEAR BEAT BEAU BECK BEEF BEEN BEER BEET BELA
BELL BELT BEND BENT BERG BERN BERT BESS BEST BETA BETH BHOY BIAS BIDE BIEN BILE
BILK BILL BIND BING BIRD BITE BITS BLAB BLAT BLED BLEW BLOB BLOC BLOT BLOW BLUE
BLUM BLUR BOAR BOAT BOCA BOCK BODE BODY BOGY BOHR BOIL BOLD BOLO BOLT BOMB BONA
BOND BONE BONG BONN BONY BOOK BOOM BOON BOOT BORE BORG BORN BOSE BOSS BOTH BOUT
BOWL BOYD BRAD BRAE BRAG BRAN BRAY BRED BREW BRIG BRIM BROW BUCK BUDD BUFF BULB
BULK BULL BUNK BUNT BUOY BURG BURL BURN BURR BURT BURY BUSH BUSS BUST BUSY BYTE
CADY CAFE CAGE CAIN CAKE CALF CALL CALM CAME CANE CANT CARD CARE CARL CARR CART
CASE CASH CASK CAST CAVE CEIL CELL CENT CERN CHAD CHAR CHAT CHAW CHEF CHEN CHEW
CHIC CHIN CHOU CHOW CHUB CHUG CHUM CITE CITY CLAD CLAM CLAN CLAW CLAY CLOD CLOG
CLOT CLUB CLUE COAL COAT COCA COCK COCO CODA CODE CODY COED COIL COIN COKE COLA
COLD COLT COMA COMB COME COOK COOL COON COOT CORD CORE CORK CORN COST COVE COWL
CRAB CRAG CRAM CRAY CREW CRIB CROW CRUD CUBA CUBE CUFF CULL CULT CUNY CURB CURD
CURE CURL CURT CUTS DADE DALE DAME DANA DANE DANG DANK DARE DARK DARN DART DASH
DATA DATE DAVE DAVY DAWN DAYS DEAD DEAF DEAL DEAN DEAR DEBT DECK DEED DEEM DEER
DEFT DEFY DELL DENT DENY DESK DIAL DICE DIED DIET DIME DINE DING DINT DIRE DIRT
DISC DISH DISK DIVE DOCK DOES DOLE DOLL DOLT DOME DONE DOOM DOOR DORA DOSE DOTE
DOUG DOUR DOVE DOWN DRAB DRAG DRAM DRAW DREW DRUB DRUG DRUM DUAL DUCK DUCT DUEL
DUET DUKE DULL DUMB DUNE DUNK DUSK DUST DUTY EACH EARL EARN EASE EAST EASY EBEN
ECHO EDDY EDEN EDGE EDGY EDIT EDNA EGAN ELAN ELBA ELLA ELSE EMIL EMIT EMMA ENDS
ERIC EROS EVEN EVER EVIL EYED FACE FACT FADE FAIL FAIN FAIR FAKE FALL FAME FANG
FARM FAST FATE FAWN FEAR FEAT FEED FEEL FEET FELL FELT FEND FERN FEST FEUD FIEF
FIGS FILE FILL FILM FIND FINE FINK FIRE FIRM FISH FISK FIST FITS FIVE FLAG FLAK
FLAM FLAT FLAW FLEA FLED FLEW FLIT FLOC FLOG FLOW FLUB FLUE FOAL FOAM FOGY FOIL
FOLD FOLK FOND FONT FOOD FOOL FOOT FORD FORE FORK FORM FORT FOSS FOUL FOUR FOWL
FRAU FRAY FRED FREE FRET FREY FROG FROM FUEL FULL FUME FUND FUNK FURY FUSE FUSS
GAFF GAGE GAIL GAIN GAIT GALA GALE GALL GALT GAME GANG GARB GARY GASH GATE GAUL
GAUR GAVE GAWK GEAR GELD GENE GENT GERM GETS GIBE GIFT GILD GILL GILT GINA GIRD
GIRL GIST GIVE GLAD GLEE GLEN GLIB GLOB GLOM GLOW GLUE GLUM GLUT GOAD GOAL GOAT
GOER GOES GOLD GOLF GONE GONG GOOD GOOF GORE GORY GOSH GOUT GOWN GRAB GRAD GRAY
GREG GREW GREY GRID GRIM GRIN GRIT GROW GRUB GULF GULL GUNK GURU GUSH GUST GWEN
GWYN HAAG HAAS HACK HAIL HAIR HALE HALF HALL HALO HALT HAND HANG HANK HANS HARD
HARK HARM HART HASH HAST HATE HATH HAUL HAVE HAWK HAYS HEAD HEAL HEAR HEAT HEBE
HECK HEED HEEL HEFT HELD HELL HELM HERB HERD HERE HERO HERS HESS HEWN HICK HIDE
HIGH HIKE HILL HILT HIND HINT HIRE HISS HIVE HOBO HOCK HOFF HOLD HOLE HOLM HOLT
HOME HONE HONK HOOD HOOF HOOK HOOT HORN HOSE HOST HOUR HOVE HOWE HOWL HOYT HUCK
HUED HUFF HUGE HUGH HUGO HULK HULL HUNK HUNT HURD HURL HURT HUSH HYDE HYMN IBIS
ICON IDEA IDLE IFFY INCA INCH INTO IONS IOTA IOWA IRIS IRMA IRON ISLE ITCH ITEM
IVAN JACK JADE JAIL JAKE JANE JAVA JEAN JEFF JERK JESS JEST JIBE JILL JILT JIVE
JOAN JOBS JOCK JOEL JOEY JOHN JOIN JOKE JOLT JOVE JUDD JUDE JUDO JUDY JUJU JUKE
JULY JUNE JUNK JUNO JURY JUST JUTE KAHN KALE KANE KANT KARL KATE KEEL KEEN KENO
KENT KERN KERR KEYS KICK KILL KIND KING KIRK KISS KITE KLAN KNEE KNEW KNIT KNOB
KNOT KNOW KOCH KONG KUDO KURD KURT KYLE LACE LACK LACY LADY LAID LAIN LAIR LAKE
LAMB LAME LAND LANE LANG LARD LARK LASS LAST LATE LAUD LAVA LAWN LAWS LAYS LEAD
LEAF LEAK LEAN LEAR LEEK LEER LEFT LEND LENS LENT LEON LESK LESS LEST LETS LIAR
LICE LICK LIED LIEN LIES LIEU LIFE LIFT LIKE LILA LILT LILY LIMA LIMB LIME LIND
LINE LINK LINT LION LISA LIST LIVE LOAD LOAF LOAM LOAN LOCK LOFT LOGE LOIS LOLA
LONE LONG LOOK LOON LOOT LORD LORE LOSE LOSS LOST LOUD LOVE LOWE LUCK LUCY LUGE
LUKE LULU LUND LUNG LURA LURE LURK LUSH LUST LYLE LYNN LYON LYRA MACE MADE MAGI
MAID MAIL MAIN MAKE MALE MALI MALL MALT MANA MANN MANY MARC MARE MARK MARS MART
MARY MASH MASK MASS MAST MATE MATH MAUL MAYO MEAD MEAL MEAN MEAT MEEK MEET MELD
MELT MEMO MEND MENU MERT MESH MESS MICE MIKE MILD MILE MILK MILL MILT MIMI MIND
MINE MINI MINK MINT MIRE MISS MIST MITE MITT MOAN MOAT MOCK MODE MOLD MOLE MOLL
MOLT MONA MONK MONT MOOD MOON MOOR MOOT MORE MORN MORT MOSS MOST MOTH MOVE MUCH
MUCK MUDD MUFF MULE MULL MURK MUSH MUST MUTE MUTT MYRA MYTH NAGY NAIL NAIR NAME
NARY NASH NAVE NAVY NEAL NEAR NEAT NECK NEED NEIL NELL NEON NERO NESS NEST NEWS
NEWT NIBS NICE NICK NILE NINA NINE NOAH NODE NOEL NOLL NONE NOOK NOON NORM NOSE
NOTE NOUN NOVA NUDE NULL NUMB OATH OBEY OBOE ODIN OHIO OILY OINT OKAY OLAF OLDY
OLGA OLIN OMAN OMEN OMIT ONCE ONES ONLY ONTO ONUS ORAL ORGY OSLO OTIS OTTO OUCH
OUST OUTS OVAL OVEN OVER OWLY OWNS QUAD QUIT QUOD RACE RACK RACY RAFT RAGE RAID
RAIL RAIN RAKE RANK RANT RARE RASH RATE RAVE RAYS READ REAL REAM REAR RECK REED
REEF REEK REEL REID REIN RENA REND RENT REST RICE RICH RICK RIDE RIFT RILL RIME
RING RINK RISE RISK RITE ROAD ROAM ROAR ROBE ROCK RODE ROIL ROLL ROME ROOD ROOF
ROOK ROOM ROOT ROSA ROSE ROSS ROSY ROTH ROUT ROVE ROWE ROWS RUBE RUBY RUDE RUDY
RUIN RULE RUNG RUNS RUNT RUSE RUSH RUSK RUSS RUST RUTH SACK SAFE SAGE SAID SAIL
SALE SALK SALT SAME SAND SANE SANG SANK SARA SAUL SAVE SAYS SCAN SCAR SCAT SCOT
SEAL SEAM SEAR SEAT SEED SEEK SEEM SEEN SEES SELF SELL SEND SENT SETS SEWN SHAG
SHAM SHAW SHAY SHED SHIM SHIN SHOD SHOE SHOT SHOW SHUN SHUT SICK SIDE SIFT SIGH
SIGN SILK SILL SILO SILT SINE SING SINK SIRE SITE SITS SITU SKAT SKEW SKID SKIM
SKIN SKIT SLAB SLAM SLAT SLAY SLED SLEW SLID SLIM SLIT SLOB SLOG SLOT SLOW SLUG
SLUM SLUR SMOG SMUG SNAG SNOB SNOW SNUB SNUG SOAK SOAR SOCK SODA SOFA SOFT SOIL
SOLD SOME SONG SOON SOOT SORE SORT SOUL SOUR SOWN STAB STAG STAN STAR STAY STEM
STEW STIR STOW STUB STUN SUCH SUDS SUIT SULK SUMS SUNG SUNK SURE SURF SWAB SWAG
SWAM SWAN SWAT SWAY SWIM SWUM TACK TACT TAIL TAKE TALE TALK TALL TANK TASK TATE
TAUT TEAL TEAM TEAR TECH TEEM TEEN TEET TELL TEND TENT TERM TERN TESS TEST THAN
THAT THEE THEM THEN THEY THIN THIS THUD THUG TICK TIDE TIDY TIED TIER TILE TILL
TILT TIME TINA TINE TINT TINY TIRE TOAD TOGO TOIL TOLD TOLL TONE TONG TONY TOOK
TOOL TOOT TORE TORN TOTE TOUR TOUT TOWN TRAG TRAM TRAY TREE TREK TRIG TRIM TRIO
TROD TROT TROY TRUE TUBA TUBE TUCK TUFT TUNA TUNE TUNG TURF TURN TUSK TWIG TWIN
TWIT ULAN UNIT URGE USED USER USES UTAH VAIL VAIN VALE VARY VASE VAST VEAL VEDA
VEIL VEIN VEND VENT VERB VERY VETO VICE VIEW VINE VISE VOID VOLT VOTE WACK WADE
WAGE WAIL WAIT WAKE WALE WALK WALL WALT WAND WANE WANG WANT WARD WARM WARN WART
WASH WAST WATS WATT WAVE WAVY WAYS WEAK WEAL WEAN WEAR WEED WEEK WEIR WELD WELL
WELT WENT WERE WERT WEST WHAM WHAT WHEE WHEN WHET WHOA WHOM WICK WIFE WILD WILL
WIND WINE WING WINK WINO WIRE WISE WISH WITH WOLF WONT WOOD WOOL WORD WORE WORK
WORM WORN WOVE WRIT WYNN YALE YANG YANK YARD YARN YAWL YAWN YEAH YEAR YELL YOGA
YOKE}
ALGO_MAP = 
{ 'md4' => OpenSSL::Digest::MD4,
'md5' => Digest::MD5 }.freeze

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(seq_num, seed, passphrase, algo_str = 'md5') ⇒ OTP

create an OTP instance. passphrase length must be >= 10 and <= 63. passphrase must only contains pure ascii characters (7 bits). seed should only contains alpha-numeric characters. algo_str can be “md4” or “md5” (default).

Raises:

  • (ArgumentError) 


139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
 
# File 'lib/otp.rb', line 139

def initialize(seq_num, seed, passphrase, algo_str = 'md5')
  raise ArgumentError, 'passphrase must be from 10 to 63 characters long' unless (10..63).include?(passphrase.size)

  passphrase.each_byte do |b|
    raise ArgumentError, 'passphrase contains non-ASCII characters' if b > 127
  end

  if seed !~ /^\w+$/
    raise ArgumentError, "seed contains non alpha-numeric characters"
  end

  @hash = seed+passphrase

  algo = ALGO_MAP[algo_str]

  (seq_num+1).times do
    regs = algo.digest(@hash).unpack("V4")
    ac = regs[0] ^ regs[2]
    bd = regs[1] ^ regs[3]
    @hash = [ac, bd].pack("V2")
  end
end

Class Method Details

.generate_seed ⇒ Object

generate a pseudo-random seed like “gh1234” or “zf4326”



129
130
131
132
 
# File 'lib/otp.rb', line 129

def self.generate_seed
  ( (0..1).collect { (rand(26) + 97).chr } +
    (0..3).collect { (rand(10) + 48).chr }).join("")
end

Instance Method Details

#to_i ⇒ Object

return integer for this OTP



163
164
165
166
167
168
 
# File 'lib/otp.rb', line 163

def to_i
  (0...8).inject(0) do |sum, i|
    sum <<= 8
    sum |= (@hash[i].ord & 0xff)
  end
end

#to_s ⇒ Object

return words sentence for this OTP



171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
 
# File 'lib/otp.rb', line 171

def to_s
  parity = 0
  wi = tmplong = to_i
  sentence = ""

  32.times do |i|
    parity += tmplong & 3
    tmplong >>= 2
  end

  4.downto(0) do |i|
    sentence << WORDS[ ((wi >> (i * 11 + 9)) & 0x7ff)] + " "
  end

  sentence << WORDS[ ((wi << 2) & 0x7fc) | (parity & 3) ]
  sentence
end