text: // Copyright (c) 2016 The Gulden developers
  // Authored by: Malcolm MacLeod (mmacleod@webmail.co.za)
  // Distributed under the GULDEN software license, see the accompanying
  // file COPYING
  
  #include "mnemonic.h"
  #include "arith_uint256.h"
  
  #include <Gulden/Common/scrypt.h>
  #include <Gulden/Common/hash/hash.h>
  
  #include <bitset>
  #include <sstream>
  #include "utilstrencodings.h"
  
  const char* wordList[] = {
      "abandon", "ability", "able", "about", "above", "absent", "absorb", "abstract", "absurd", "abuse", "access", "accident", "account", "accuse", "achieve", "acid", "acoustic", "acquire",
      "across", "act", "action", "actor", "actress", "actual", "adapt", "add", "addict", "address", "adjust", "admit", "adult", "advance", "advice", "aerobic", "affair", "afford", "afraid",
      "again", "age", "agent", "agree", "ahead", "aim", "air", "airport", "aisle", "alarm", "album", "alcohol", "alert", "alien", "all", "alley", "allow", "almost", "alone", "alpha",
      "already", "also", "alter", "always", "amateur", "amazing", "among", "amount", "amused", "analyst", "anchor", "ancient", "anger", "angle", "angry", "animal", "ankle", "announce",
      "annual", "another", "answer", "antenna", "antique", "anxiety", "any", "apart", "apology", "appear", "apple", "approve", "april", "arch", "arctic", "area", "arena", "argue", "arm",
      "armed", "armor", "army", "around", "arrange", "arrest", "arrive", "arrow", "art", "artefact", "artist", "artwork", "ask", "aspect", "assault", "asset", "assist", "assume", "asthma",
      "athlete", "atom", "attack", "attend", "attitude", "attract", "auction", "audit", "august", "aunt", "author", "auto", "autumn", "average", "avocado", "avoid", "awake", "aware", "away",
      "awesome", "awful", "awkward", "axis", "baby", "bachelor", "bacon", "badge", "bag", "balance", "balcony", "ball", "bamboo", "banana", "banner", "bar", "barely", "bargain",
      "barrel", "base", "basic", "basket", "battle", "beach", "bean", "beauty", "because", "become", "beef", "before", "begin", "behave", "behind", "believe", "below", "belt", "bench",
      "benefit", "best", "betray", "better", "between", "beyond", "bicycle", "bid", "bike", "bind", "biology", "bird", "birth", "bitter", "black", "blade", "blame", "blanket", "blast",
      "bleak", "bless", "blind", "blood", "blossom", "blouse", "blue", "blur", "blush", "board", "boat", "body", "boil", "bomb", "bone", "bonus", "book", "boost", "border", "boring",
      "borrow", "boss", "bottom", "bounce", "box", "boy", "bracket", "brain", "brand", "brass", "brave", "bread", "breeze", "brick", "bridge", "brief", "bright", "bring", "brisk",
      "broccoli", "broken", "bronze", "broom", "brother", "brown", "brush", "bubble", "buddy", "budget", "buffalo", "build", "bulb", "bulk", "bullet", "bundle", "bunker", "burden",
      "burger", "burst", "bus", "business", "busy", "butter", "buyer", "buzz", "cabbage", "cabin", "cable", "cactus", "cage", "cake", "call", "calm", "camera", "camp", "can", "canal",
      "cancel", "candy", "cannon", "canoe", "canvas", "canyon", "capable", "capital", "captain", "car", "carbon", "card", "cargo", "carpet", "carry", "cart", "case", "cash", "casino", "castle", "casual",
      "cat", "catalog", "catch", "category", "cattle", "caught", "cause", "caution", "cave", "ceiling", "celery", "cement", "census", "century", "cereal", "certain", "chair", "chalk", "champion",
      "change", "chaos", "chapter", "charge", "chase", "chat", "cheap", "check", "cheese", "chef", "cherry", "chest", "chicken", "chief", "child", "chimney", "choice", "choose", "chronic", "chuckle",
      "chunk", "churn", "cigar", "cinnamon", "circle", "citizen", "city", "civil", "claim", "clap", "clarify", "claw", "clay", "clean", "clerk", "clever", "click", "client", "cliff", "climb", "clinic",
      "clip", "clock", "clog", "close", "cloth", "cloud", "clown", "club", "clump", "cluster", "clutch", "coach", "coast", "coconut", "code", "coffee", "coil", "coin", "collect", "color", "column",
      "combine", "come", "comfort", "comic", "common", "company", "concert", "conduct", "confirm", "congress", "connect", "consider", "control", "convince", "cook", "cool", "copper", "copy", "coral",
      "core", "corn", "correct", "cost", "cotton", "couch", "country", "couple", "course", "cousin", "cover", "coyote", "crack", "cradle", "craft", "cram", "crane", "crash", "crater", "crawl", "crazy",
      "cream", "credit", "creek", "crew", "cricket", "crime", "crisp", "critic", "crop", "cross", "crouch", "crowd", "crucial", "cruel", "cruise", "crumble", "crunch", "crush", "cry",
      "crystal", "cube", "culture", "cup", "cupboard", "curious", "current", "curtain", "curve", "cushion", "custom", "cute", "cycle", "dad", "damage", "damp", "dance", "danger", "daring", "dash",
      "daughter", "dawn", "day", "deal", "debate", "debris", "decade", "december", "decide", "decline", "decorate", "decrease", "deer", "defense", "define", "defy", "degree", "delay", "deliver", "demand",
      "demise", "denial", "dentist", "deny", "depart", "depend", "deposit", "depth", "deputy", "derive", "describe", "desert", "design", "desk", "despair", "destroy", "detail", "detect", "develop",
      "device", "devote", "diagram", "dial", "diamond", "diary", "dice", "diesel", "diet", "differ", "digital", "dignity", "dilemma", "dinner", "dinosaur", "direct", "dirt", "disagree", "discover", "disease",
      "dish", "dismiss", "disorder", "display", "distance", "divert", "divide", "divorce", "dizzy", "doctor", "document", "dog", "doll", "dolphin", "domain", "donate", "donkey", "donor", "door", "dose",
      "double", "dove", "draft", "dragon", "drama", "drastic", "draw", "dream", "dress", "drift", "drill", "drink", "drip", "drive", "drop", "drum", "dry", "duck", "dumb", "dune", "during", "dust", "dutch",
      "duty", "dwarf", "dynamic", "eager", "eagle", "early", "earn", "earth", "easily", "east", "easy", "echo", "ecology", "economy", "edge", "edit", "educate", "effort", "egg", "eight", "either", "elbow",
      "elder", "electric", "elegant", "element", "elephant", "elevator", "elite", "else", "embark", "embody", "embrace", "emerge", "emotion", "employ", "empower", "empty", "enable", "enact", "end", "endless",
      "endorse", "enemy", "energy", "enforce", "engage", "engine", "enhance", "enjoy", "enlist", "enough", "enrich", "enroll", "ensure", "enter", "entire", "entry", "envelope", "episode", "equal", "equip",
      "era", "erase", "erode", "erosion", "error", "erupt", "escape", "essay", "essence", "estate", "eternal", "ethics", "evidence", "evil", "evoke", "evolve", "exact", "example", "excess", "exchange",
      "excite", "exclude", "excuse", "execute", "exercise", "exhaust", "exhibit", "exile", "exist", "exit", "exotic", "expand", "expect", "expire", "explain", "expose", "express", "extend", "extra", "eye",
      "eyebrow", "fabric", "face", "faculty", "fade", "faint", "faith", "fall", "false", "fame", "family", "famous", "fan", "fancy", "fantasy", "farm", "fashion", "fat", "fatal", "father", "fatigue", "fault",
      "favorite", "feature", "february", "federal", "fee", "feed", "feel", "female", "fence", "festival", "fetch", "fever", "few", "fiber", "fiction", "field", "figure", "file", "film", "filter", "final", "find",
      "fine", "finger", "finish", "fire", "firm", "first", "fiscal", "fish", "fit", "fitness", "fix", "flag", "flame", "flash", "flat", "flavor", "flee", "flight", "flip", "float", "flock", "floor", "flower",
      "fluid", "flush", "fly", "foam", "focus", "fog", "foil", "fold", "follow", "food", "foot", "force", "forest", "forget", "fork", "fortune", "forum", "forward", "fossil", "foster", "found", "fox",
      "fragile", "frame", "frequent", "fresh", "friend", "fringe", "frog", "front", "frost", "frown", "frozen", "fruit", "fuel", "fun", "funny", "furnace", "fury", "future", "gadget", "gain",
      "galaxy", "gallery", "game", "gap", "garage", "garbage", "garden", "garlic", "garment", "gas", "gasp", "gate", "gather", "gauge", "gaze", "general", "genius", "genre", "gentle", "genuine", "gesture",
      "ghost", "giant", "gift", "giggle", "ginger", "giraffe", "girl", "give", "glad", "glance", "glare", "glass", "glide", "glimpse", "globe", "gloom", "glory", "glove", "glow", "glue", "goat", "goddess",
      "gold", "good", "goose", "gorilla", "gospel", "gossip", "govern", "gown", "grab", "grace", "grain", "grant", "grape", "grass", "gravity", "great", "green", "grid", "grief", "grit", "grocery", "group",
      "grow", "grunt", "guard", "guess", "guide", "guilt", "guitar", "gun", "gym", "habit", "hair", "half", "hammer", "hamster", "hand", "happy", "harbor", "hard", "harsh", "harvest", "hat", "have", "hawk",
      "hazard", "head", "health", "heart", "heavy", "hedgehog", "height", "hello", "helmet", "help", "hen", "hero", "hidden", "high", "hill", "hint", "hip", "hire", "history", "hobby", "hockey", "hold",
      "hole", "holiday", "hollow", "home", "honey", "hood", "hope", "horn", "horror", "horse", "hospital", "host", "hotel", "hour", "hover", "hub", "huge", "human", "humble", "humor", "hundred", "hungry",
      "hunt", "hurdle", "hurry", "hurt", "husband", "hybrid", "ice", "icon", "idea", "identify", "idle", "ignore", "ill", "illegal", "illness", "image", "imitate", "immense", "immune", "impact", "impose",
      "improve", "impulse", "inch", "include", "income", "increase", "index", "indicate", "indoor", "industry", "infant", "inflict", "inform", "inhale", "inherit", "initial", "inject", "injury", "inmate",
      "inner", "innocent", "input", "inquiry", "insane", "insect", "inside", "inspire", "install", "intact", "interest", "into", "invest", "invite", "involve", "iron", "island", "isolate", "issue", "item",
      "ivory", "jacket", "jaguar", "jar", "jazz", "jealous", "jeans", "jelly", "jewel", "job", "join", "joke", "journey", "joy", "judge", "juice", "jump", "jungle", "junior", "junk", "just", "kangaroo", "keen",
      "keep", "ketchup", "key", "kick", "kid", "kidney", "kind", "kingdom", "kiss", "kit", "kitchen", "kite", "kitten", "kiwi", "knee", "knife", "knock", "know", "lab", "label", "labor", "ladder", "lady", "lake",
      "lamp", "language", "laptop", "large", "later", "latin", "laugh", "laundry", "lava", "law", "lawn", "lawsuit", "layer", "lazy", "leader", "leaf", "learn", "leave", "lecture", "left", "leg", "legal", "legend",
      "leisure", "lemon", "lend", "length", "lens", "leopard", "lesson", "letter", "level", "liar", "liberty", "library", "license", "life", "lift", "light", "like", "limb", "limit", "link", "lion", "liquid",
      "list", "little", "live", "lizard", "load", "loan", "lobster", "local", "lock", "logic", "lonely", "long", "loop", "lottery", "loud", "lounge", "love", "loyal", "lucky", "luggage", "lumber", "lunar",
      "lunch", "luxury", "lyrics", "machine", "mad", "magic", "magnet", "maid", "mail", "main", "major", "make", "mammal", "man", "manage", "mandate", "mango", "mansion", "manual", "maple", "marble", "march",
      "margin", "marine", "market", "marriage", "mask", "mass", "master", "match", "material", "math", "matrix", "matter", "maximum", "maze", "meadow", "mean", "measure", "meat", "mechanic", "medal", "media",
      "melody", "melt", "member", "memory", "mention", "menu", "mercy", "merge", "merit", "merry", "mesh", "message", "metal", "method", "middle", "midnight", "milk", "million", "mimic", "mind", "minimum",
      "minor", "minute", "miracle", "mirror", "misery", "miss", "mistake", "mix", "mixed", "mixture", "mobile", "model", "modify", "mom", "moment", "monitor", "monkey", "monster", "month", "moon", "moral",
      "more", "morning", "mosquito", "mother", "motion", "motor", "mountain", "mouse", "move", "movie", "much", "muffin", "mule", "multiply", "muscle", "museum", "mushroom", "music", "must", "mutual",
      "myself", "mystery", "myth", "naive", "name", "napkin", "narrow", "nasty", "nation", "nature", "near", "neck", "need", "negative", "neglect", "neither", "nephew", "nerve", "nest", "net", "network",
      "neutral", "never", "news", "next", "nice", "night", "noble", "noise", "nominee", "noodle", "normal", "north", "nose", "notable", "note", "nothing", "notice", "novel", "now", "nuclear", "number",
      "nurse", "nut", "oak", "obey", "object", "oblige", "obscure", "observe", "obtain", "obvious", "occur", "ocean", "october", "odor", "off", "offer", "office", "often", "oil", "okay", "old", "olive",
      "olympic", "omit", "once", "one", "onion", "online", "only", "open", "opera", "opinion", "oppose", "option", "orange", "orbit", "orchard", "order", "ordinary", "organ", "orient", "original", "orphan",
      "ostrich", "other", "outdoor", "outer", "output", "outside", "oval", "oven", "over", "own", "owner", "oxygen", "oyster", "ozone", "pact", "paddle", "page", "pair", "palace", "palm", "panda", "panel",
      "panic", "panther", "paper", "parade", "parent", "park", "parrot", "party", "pass", "patch", "path", "patient", "patrol", "pattern", "pause", "pave", "payment", "peace", "peanut", "pear", "peasant",
      "pelican", "pen", "penalty", "pencil", "people", "pepper", "perfect", "permit", "person", "pet", "phone", "photo", "phrase", "physical", "piano", "picnic", "picture", "piece", "pig", "pigeon", "pill",
      "pilot", "pink", "pioneer", "pipe", "pistol", "pitch", "pizza", "place", "planet", "plastic", "plate", "play", "please", "pledge", "pluck", "plug", "plunge", "poem", "poet", "point", "polar", "pole",
      "police", "pond", "pony", "pool", "popular", "portion", "position", "possible", "post", "potato", "pottery", "poverty", "powder", "power", "practice", "praise", "predict", "prefer", "prepare", "present",
      "pretty", "prevent", "price", "pride", "primary", "print", "priority", "prison", "private", "prize", "problem", "process", "produce", "profit", "program", "project", "promote", "proof", "property",
      "prosper", "protect", "proud", "provide", "public", "pudding", "pull", "pulp", "pulse", "pumpkin", "punch", "pupil", "puppy", "purchase", "purity", "purpose", "purse", "push", "put", "puzzle",
      "pyramid", "quality", "quantum", "quarter", "question", "quick", "quit", "quiz", "quote", "rabbit", "raccoon", "race", "rack", "radar", "radio", "rail", "rain", "raise", "rally", "ramp", "ranch",
      "random", "range", "rapid", "rare", "rate", "rather", "raven", "raw", "razor", "ready", "real", "reason", "rebel", "rebuild", "recall", "receive", "recipe", "record", "recycle", "reduce",
      "reflect", "reform", "refuse", "region", "regret", "regular", "reject", "relax", "release", "relief", "rely", "remain", "remember", "remind", "remove", "render", "renew", "rent", "reopen",
      "repair", "repeat", "replace", "report", "require", "rescue", "resemble", "resist", "resource", "response", "result", "retire", "retreat", "return", "reunion", "reveal", "review", "reward",
      "rhythm", "rib", "ribbon", "rice", "rich", "ride", "ridge", "rifle", "right", "rigid", "ring", "riot", "ripple", "risk", "ritual", "rival", "river", "road", "roast", "robot", "robust", "rocket",
      "romance", "roof", "rookie", "room", "rose", "rotate", "rough", "round", "route", "royal", "rubber", "rude", "rug", "rule", "run", "runway", "rural", "sad", "saddle", "sadness", "safe",
      "sail", "salad", "salmon", "salon", "salt", "salute", "same", "sample", "sand", "satisfy", "satoshi", "sauce", "sausage", "save", "say", "scale", "scan", "scare", "scatter", "scene", "scheme",
      "school", "science", "scissors", "scorpion", "scout", "scrap", "screen", "script", "scrub", "sea", "search", "season", "seat", "second", "secret", "section", "security", "seed", "seek", "segment",
      "select", "sell", "seminar", "senior", "sense", "sentence", "series", "service", "session", "settle", "setup", "seven", "shadow", "shaft", "shallow", "share", "shed", "shell", "sheriff", "shield",
      "shift", "shine", "ship", "shiver", "shock", "shoe", "shoot", "shop", "short", "shoulder", "shove", "shrimp", "shrug", "shuffle", "shy", "sibling", "sick", "side", "siege", "sight", "sign", "silent",
      "silk", "silly", "silver", "similar", "simple", "since", "sing", "siren", "sister", "situate", "six", "size", "skate", "sketch", "ski", "skill", "skin", "skirt", "skull", "slab", "slam",
      "sleep", "slender", "slice", "slide", "slight", "slim", "slogan", "slot", "slow", "slush", "small", "smart", "smile", "smoke", "smooth", "snack", "snake", "snap", "sniff", "snow", "soap",
      "soccer", "social", "sock", "soda", "soft", "solar", "soldier", "solid", "solution", "solve", "someone", "song", "soon", "sorry", "sort", "soul", "sound", "soup", "source", "south", "space",
      "spare", "spatial", "spawn", "speak", "special", "speed", "spell", "spend", "sphere", "spice", "spider", "spike", "spin", "spirit", "split", "spoil", "sponsor", "spoon", "sport", "spot", "spray",
      "spread", "spring", "spy", "square", "squeeze", "squirrel", "stable", "stadium", "staff", "stage", "stairs", "stamp", "stand", "start", "state", "stay", "steak", "steel", "stem", "step", "stereo",
      "stick", "still", "sting", "stock", "stomach", "stone", "stool", "story", "stove", "strategy", "street", "strike", "strong", "struggle", "student", "stuff", "stumble", "style", "subject", "submit",
      "subway", "success", "such", "sudden", "suffer", "sugar", "suggest", "suit", "summer", "sun", "sunny", "sunset", "super", "supply", "supreme", "sure", "surface", "surge", "surprise", "surround",
      "survey", "suspect", "sustain", "swallow", "swamp", "swap", "swarm", "swear", "sweet", "swift", "swim", "swing", "switch", "sword", "symbol", "symptom", "syrup", "system", "table", "tackle", "tag",
      "tail", "talent", "talk", "tank", "tape", "target", "task", "taste", "tattoo", "taxi", "teach", "team", "tell", "ten", "tenant", "tennis", "tent", "term", "test", "text", "thank", "that", "theme",
      "then", "theory", "there", "they", "thing", "this", "thought", "three", "thrive", "throw", "thumb", "thunder", "ticket", "tide", "tiger", "tilt", "timber", "time", "tiny", "tip", "tired", "tissue",
      "title", "toast", "tobacco", "today", "toddler", "toe", "together", "toilet", "token", "tomato", "tomorrow", "tone", "tongue", "tonight", "tool", "tooth", "top", "topic", "topple", "torch",
      "tornado", "tortoise", "toss", "total", "tourist", "toward", "tower", "town", "toy", "track", "trade", "traffic", "tragic", "train", "transfer", "trap", "trash", "travel", "tray", "treat",
      "tree", "trend", "trial", "tribe", "trick", "trigger", "trim", "trip", "trophy", "trouble", "truck", "true", "truly", "trumpet", "trust", "truth", "try", "tube", "tuition", "tumble", "tuna",
      "tunnel", "turkey", "turn", "turtle", "twelve", "twenty", "twice", "twin", "twist", "two", "type", "typical", "ugly", "umbrella", "unable", "unaware", "uncle", "uncover", "under", "undo",
      "unfair", "unfold", "unhappy", "uniform", "unique", "unit", "universe", "unknown", "unlock", "until", "unusual", "unveil", "update", "upgrade", "uphold", "upon", "upper", "upset", "urban",
      "urge", "usage", "use", "used", "useful", "useless", "usual", "utility", "vacant", "vacuum", "vague", "valid", "valley", "valve", "van", "vanish", "vapor", "various", "vast", "vault", "vehicle",
      "velvet", "vendor", "venture", "venue", "verb", "verify", "version", "very", "vessel", "veteran", "viable", "vibrant", "vicious", "victory", "video", "view", "village", "vintage", "violin",
      "virtual", "virus", "visa", "visit", "visual", "vital", "vivid", "vocal", "voice", "void", "volcano", "volume", "vote", "voyage", "wage", "wagon", "wait", "walk", "wall", "walnut", "want",
      "warfare", "warm", "warrior", "wash", "wasp", "waste", "water", "wave", "way", "wealth", "weapon", "wear", "weasel", "weather", "web", "wedding", "weekend", "weird", "welcome", "west", "wet",
      "whale", "what", "wheat", "wheel", "when", "where", "whip", "whisper", "wide", "width", "wife", "wild", "will", "win", "window", "wine", "wing", "wink", "winner", "winter", "wire", "wisdom",
      "wise", "wish", "witness", "wolf", "woman", "wonder", "wood", "wool", "word", "work", "world", "worry", "worth", "wrap", "wreck", "wrestle", "wrist", "write", "wrong", "yard", "year", "yellow",
      "you", "young", "youth", "zebra", "zero", "zone", "zoo"
  };
  
  unsigned char* seedFromMnemonic(const SecureString& mnemonic, const SecureString& passphrase)
  {
      SecureString salt = "mnemonic" + passphrase;
      unsigned char* seed = new unsigned char[64];
      PBKDF2_SHA512((char*)mnemonic.c_str(), mnemonic.length(), (unsigned char*)salt.c_str(), salt.length(), 2048, seed, 64);
      return seed;
  }
  
  std::vector<unsigned char> entropyFromMnemonic(const SecureString& mnemonic)
  {
      std::vector<unsigned char> entropy;
  
      std::stringstream ss(mnemonic.c_str());
      std::istream_iterator<SecureString> begin(ss);
      std::istream_iterator<SecureString> end;
      std::vector<SecureString> mnemonicWords(begin, end);
  
      if (mnemonicWords.size() < 12 || mnemonicWords.size() % 3 > 0)
          return std::vector<unsigned char>();
  
      std::bitset<11> memoryWord;
      int32_t wordIndex;
      int32_t totalBitsRead = 0;
      unsigned char word = 0;
      for (const SecureString& mnemonicWord : mnemonicWords) {
          wordIndex = 0;
          auto iter = std::find(std::begin(wordList), std::end(wordList), mnemonicWord);
          if (iter == std::end(wordList))
              return std::vector<unsigned char>();
  
          wordIndex = iter - std::begin(wordList);
          memoryWord = wordIndex;
          for (unsigned int i = 0; i < 11; ++i) {
              word <<= 1;
              if (memoryWord[10 - i])
                  word |= 0x1;
              if (++totalBitsRead % 8 == 0) {
                  entropy.push_back(word);
                  word = 0;
              }
          }
      }
      word <<= (8 - (totalBitsRead % 8));
      entropy.push_back(word);
  
      int checksumLengthBits = totalBitsRead / 33;
      int entropyLengthBits = totalBitsRead - checksumLengthBits;
      int entropyWords = entropyLengthBits / 8;
  
      uint32_t hash[8];
      hash_sha256((unsigned char*)&entropy[0], entropyLengthBits / 8, (unsigned char*)&hash[0]);
  
      std::bitset<32> hashWord;
      std::bitset<8> entropyWord;
      for (int i = 0; i < checksumLengthBits; ++i) {
          entropyWord = entropy[entropyWords + (i / 8)];
          hashWord = ReadBE32((const unsigned char*)&hash[i / 32]);
          if (hashWord[31 - i % 32] != entropyWord[7 - i % 8])
              return std::vector<unsigned char>();
      }
      entropy.resize(entropyWords);
      return entropy;
  }
  
  SecureString mnemonicFromEntropy(std::vector<unsigned char> entropyIn, int entropySizeInBits)
  {
  
      if (entropySizeInBits % 32 > 0)
          return "";
      if (entropySizeInBits < 128)
          return "";
  
      if (entropySizeInBits > 4000)
          return "";
  
      std::bitset<4096> entropy = entropyIn[0];
      for (int i = 1; i < entropySizeInBits / 8; ++i) {
          entropy <<= 8;
          entropy |= entropyIn[i];
      }
  
      uint32_t hash[8];
      hash_sha256((unsigned char*)&entropyIn[0], entropySizeInBits / 8, (unsigned char*)&hash[0]);
      unsigned int checksumSize = entropySizeInBits / 32;
      unsigned int totalSizeInBits = entropySizeInBits + checksumSize;
  
      for (unsigned int i = 0; i < 8; ++i) {
          if ((i + 1) * 32 < checksumSize) {
              entropy <<= 32;
              entropy |= hash[i];
          } else {
              std::bitset<32> temp = ReadBE32((unsigned char*)&hash[i]);
              for (unsigned int j = 0; j < checksumSize - (i * 32); ++j) {
                  entropy <<= 1;
                  if (temp[31 - j])
                      entropy[0] = 1;
              }
              break;
          }
      }
  
      SecureString mnemonicPhrase = "";
      unsigned int index = 0;
      unsigned int bitIndex = 0;
      for (unsigned int i = 0; i < totalSizeInBits / 11; ++i) {
          if (i > 0)
              mnemonicPhrase += " ";
  
          index = 0;
          for (int j = 0; j < 11; ++j) {
              index <<= 1;
  
              if (entropy[totalSizeInBits - 1 - bitIndex++])
                  index |= 0x1;
          }
          mnemonicPhrase += wordList[index];
      }
  
      return mnemonicPhrase;
  }
  
  bool checkMnemonic(const SecureString& mnemonic)
  {
      return entropyFromMnemonic(mnemonic).size() > 0;
  }
  
  bool testMnemonics()
  {
      std::vector<std::pair<SecureString, SecureString> > testVector;
  
      testVector.push_back(std::make_pair("00000000000000000000000000000000", "abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon about"));
      testVector.push_back(std::make_pair("7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f", "legal winner thank year wave sausage worth useful legal winner thank yellow"));
      testVector.push_back(std::make_pair("80808080808080808080808080808080", "letter advice cage absurd amount doctor acoustic avoid letter advice cage above"));
      testVector.push_back(std::make_pair("ffffffffffffffffffffffffffffffff", "zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo wrong"));
      testVector.push_back(std::make_pair("000000000000000000000000000000000000000000000000", "abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon agent"));
      testVector.push_back(std::make_pair("7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f", "legal winner thank year wave sausage worth useful legal winner thank year wave sausage worth useful legal will"));
      testVector.push_back(std::make_pair("808080808080808080808080808080808080808080808080", "letter advice cage absurd amount doctor acoustic avoid letter advice cage absurd amount doctor acoustic avoid letter always"));
      testVector.push_back(std::make_pair("ffffffffffffffffffffffffffffffffffffffffffffffff", "zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo when"));
      testVector.push_back(std::make_pair("0000000000000000000000000000000000000000000000000000000000000000", "abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon art"));
      testVector.push_back(std::make_pair("7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f7f", "legal winner thank year wave sausage worth useful legal winner thank year wave sausage worth useful legal winner thank year wave sausage worth title"));
      testVector.push_back(std::make_pair("8080808080808080808080808080808080808080808080808080808080808080", "letter advice cage absurd amount doctor acoustic avoid letter advice cage absurd amount doctor acoustic avoid letter advice cage absurd amount doctor acoustic bless"));
      testVector.push_back(std::make_pair("ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", "zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo zoo vote"));
      testVector.push_back(std::make_pair("9e885d952ad362caeb4efe34a8e91bd2", "ozone drill grab fiber curtain grace pudding thank cruise elder eight picnic"));
      testVector.push_back(std::make_pair("6610b25967cdcca9d59875f5cb50b0ea75433311869e930b", "gravity machine north sort system female filter attitude volume fold club stay feature office ecology stable narrow fog"));
      testVector.push_back(std::make_pair("68a79eaca2324873eacc50cb9c6eca8cc68ea5d936f98787c60c7ebc74e6ce7c", "hamster diagram private dutch cause delay private meat slide toddler razor book happy fancy gospel tennis maple dilemma loan word shrug inflict delay length"));
      testVector.push_back(std::make_pair("c0ba5a8e914111210f2bd131f3d5e08d", "scheme spot photo card baby mountain device kick cradle pact join borrow"));
      testVector.push_back(std::make_pair("6d9be1ee6ebd27a258115aad99b7317b9c8d28b6d76431c3", "horn tenant knee talent sponsor spell gate clip pulse soap slush warm silver nephew swap uncle crack brave"));
      testVector.push_back(std::make_pair("9f6a2878b2520799a44ef18bc7df394e7061a224d2c33cd015b157d746869863", "panda eyebrow bullet gorilla call smoke muffin taste mesh discover soft ostrich alcohol speed nation flash devote level hobby quick inner drive ghost inside"));
      testVector.push_back(std::make_pair("23db8160a31d3e0dca3688ed941adbf3", "cat swing flag economy stadium alone churn speed unique patch report train"));
      testVector.push_back(std::make_pair("8197a4a47f0425faeaa69deebc05ca29c0a5b5cc76ceacc0", "light rule cinnamon wrap drastic word pride squirrel upgrade then income fatal apart sustain crack supply proud access"));
      testVector.push_back(std::make_pair("066dca1a2bb7e8a1db2832148ce9933eea0f3ac9548d793112d9a95c9407efad", "all hour make first leader extend hole alien behind guard gospel lava path output census museum junior mass reopen famous sing advance salt reform"));
      testVector.push_back(std::make_pair("f30f8c1da665478f49b001d94c5fc452", "vessel ladder alter error federal sibling chat ability sun glass valve picture"));
      testVector.push_back(std::make_pair("c10ec20dc3cd9f652c7fac2f1230f7a3c828389a14392f05", "scissors invite lock maple supreme raw rapid void congress muscle digital elegant little brisk hair mango congress clump"));
      testVector.push_back(std::make_pair("f585c11aec520db57dd353c69554b21a89b20fb0650966fa0a9d6f74fd989d8f", "void come effort suffer camp survey warrior heavy shoot primary clutch crush open amazing screen patrol group space point ten exist slush involve unfold"));
  
      for (auto test : testVector) {
          std::vector<unsigned char> data = ParseHex(test.first.c_str());
          SecureString comp = mnemonicFromEntropy(data, data.size() * 8);
          if (comp != test.second) {
              return false;
          }
          std::vector<unsigned char> datacomp = entropyFromMnemonic(test.second);
          if (SecureString(HexStr(datacomp.begin(), datacomp.end()).c_str()) != test.first) {
              return false;
          }
      }
      return true;
  }
  