diff --git a/ChangeLog.md b/ChangeLog.md
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--- /dev/null
+++ b/ChangeLog.md
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+# Revision history for random-string
+
+## 0.1.0.0 -- YYYY-mm-dd
+
+* First version. Released on an unsuspecting world.
diff --git a/LICENSE b/LICENSE
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--- /dev/null
+++ b/LICENSE
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+Copyright (c) 2018, Thomas M. DuBuisson
+
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+
+    * Redistributions in binary form must reproduce the above
+      copyright notice, this list of conditions and the following
+      disclaimer in the documentation and/or other materials provided
+      with the distribution.
+
+    * Neither the name of Thomas M. DuBuisson nor the names of other
+      contributors may be used to endorse or promote products derived
+      from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/Setup.hs b/Setup.hs
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--- /dev/null
+++ b/Setup.hs
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+import Distribution.Simple
+main = defaultMain
diff --git a/random-string.cabal b/random-string.cabal
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--- /dev/null
+++ b/random-string.cabal
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+-- Initial random-string.cabal generated by cabal init.  For further 
+-- documentation, see http://haskell.org/cabal/users-guide/
+
+name:                random-string
+version:             0.1.0.1
+synopsis:            Generate a random base 16, 58, or 64 string
+description:         Uses the fastest strong random available for a random
+                     string of the given base and length (in bytes of entropy).
+license:             BSD3
+license-file:        LICENSE
+author:              Thomas M. DuBuisson
+maintainer:          tommd@galois.com
+copyright:           Galois 2018
+category:            Data
+build-type:          Simple
+extra-source-files:  ChangeLog.md
+cabal-version:       >=1.10
+
+library
+  exposed-modules:     System.RandomString
+  -- other-modules:       
+  -- other-extensions:    
+  build-depends:       base >=4.10 && <5
+                     , bytestring >=0.10 && <0.11
+                     , base16-bytestring
+                     , base58-bytestring
+                     , base64-bytestring
+                     , entropy >= 0.4 && < 0.5
+  hs-source-dirs:      src
+  default-language:    Haskell2010
diff --git a/src/System/RandomString.hs b/src/System/RandomString.hs
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--- /dev/null
+++ b/src/System/RandomString.hs
@@ -0,0 +1,23 @@
+module System.RandomString where
+
+import           Data.String (IsString(..))
+import qualified Data.ByteString.Char8 as B8
+import qualified Data.ByteString.Base58 as Base58
+import qualified Data.ByteString.Base64 as Base64
+import qualified Data.ByteString.Base16 as Base16
+import           Control.Monad.IO.Class
+import           System.Entropy
+
+data StringOpts = StringOpts { alphabet :: Alphabet, nrBytes :: Int }
+data Alphabet = Base58 | Base16 | Base64
+
+randomString :: (MonadIO m, IsString s) => StringOpts -> m s
+randomString opts =
+    let getE n = maybe (getEntropy n) pure =<< getHardwareEntropy n
+        conv = fromString . B8.unpack
+        enc = case alphabet opts of
+                Base58 -> Base58.encodeBase58 Base58.bitcoinAlphabet
+                Base16 -> Base16.encode
+                Base64 -> Base64.encode
+    in (conv . enc) <$> liftIO (getE (nrBytes opts))
+