Initial import

src/base58.coffee

@@ -0,0 +1,25 @@
+class Base58
+  constructor: ->
+    @alphabet = "123456789abcdefghijkmnopqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ"
+    @base = @alphabet.length
+
+  encode: (num) ->
+    throw new Error('Value passed is not a number.') if typeof num != 'number'
+    str = ''
+    while num >= @base
+      mod = num % @base
+      str = @alphabet[mod] + str
+      num = (num - mod)/@base
+    @alphabet[num] + str
+
+  decode: (str) ->
+    num = 0
+    for char, index in str.split(//).reverse()
+      if (char_index = @alphabet.indexOf(char)) == -1
+        throw new Error('Value passed not a valid Base58 string.')
+      num += char_index * Math.pow(@base, index)
+    num
+
+
+# Export module
+module.exports = new Base58()