diff --git a/.travis.yml b/.travis.yml
index fb8e068..907ccd1 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,7 +3,7 @@ os:
 - linux
 - osx
 install:
-- COX_BUILD_DEBUG=1 LIBSODIUM_BUILD_DIR=$HOME/libsodium ./build/libsodium_install.sh
+- SODIUM_BUILD_DEBUG=1 LIBSODIUM_BUILD_DIR=$HOME/libsodium ./build/libsodium_install.sh
 before_script:
 - export LIBSODIUM_BUILD_DIR=$HOME/libsodium
 after_failure:
diff --git a/README.md b/README.md
index 0798f49..cde79a3 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
-# cox
-[![Build Status](https://travis-ci.org/didactic-drunk/cox.svg?branch=master)](https://travis-ci.org/didactic-drunk/cox)
-[![Docs](https://img.shields.io/badge/docs-available-brightgreen.svg)](https://didactic-drunk.github.io/cox/)
+# sodium.cr
+[![Build Status](https://travis-ci.org/didactic-drunk/sodium.cr.svg?branch=master)](https://travis-ci.org/didactic-drunk/sodium.cr)
+[![Docs](https://img.shields.io/badge/docs-available-brightgreen.svg)](https://didactic-drunk.github.io/sodium.cr/)
 
 Updated Crystal bindings for the [libsodium API](https://libsodium.gitbook.io/doc/)
 
@@ -56,8 +56,8 @@ Add this to your application's `shard.yml`:
 
 ```yaml
 dependencies:
-  cox:
-    github: didactic-drunk/cox
+  sodium.cr:
+    github: didactic-drunk/sodium.cr
 ```
 
 ## What should I use for my application?
@@ -65,16 +65,16 @@ dependencies:
 | Class | |
 | --- | --- |
 | `CryptoBox` `Sign` `SecretBox` | I don't know much about crypto. |
-| [`Cox::CryptoBox::SecretKey`](https://didactic-drunk.github.io/cox/Cox/CryptoBox/SecretKey.html) | I want to encrypt + authenticate data using public key encryption. |
-| [`Cox::Sign::SecretKey`](https://didactic-drunk.github.io/cox/Cox/Sign/SecretKey.html) | I want to sign or verify messages without encryption. |
-| [`Cox::SecretBox`](https://didactic-drunk.github.io/cox/Cox/SecretBox.html) | I have a shared key and want to encrypt + authenticate data. |
+| [`Sodium::CryptoBox::SecretKey`](https://didactic-drunk.github.io/sodium.cr/Sodium/CryptoBox/SecretKey.html) | I want to encrypt + authenticate data using public key encryption. |
+| [`Sodium::Sign::SecretKey`](https://didactic-drunk.github.io/sodium.cr/Sodium/Sign/SecretKey.html) | I want to sign or verify messages without encryption. |
+| [`Sodium::SecretBox`](https://didactic-drunk.github.io/sodium.cr/Sodium/SecretBox.html) | I have a shared key and want to encrypt + authenticate data. |
 | AEAD | I have a shared key and want encrypt + authenticate streamed data. (Not implemented yet) |
-| [`Cox::Digest::Blake2b`](https://didactic-drunk.github.io/cox/Cox/Digest::Blake2b.html) | I want to hash data fast and securely. |
-| `Cox::Digest::SipHash` | I want to hash data really fast and less securely. (Not implemented yet) |
-| `Cox::Pwhash` | I want to hash a password and store it. |
-| `Cox::Pwhash` | I want to derive a key from a password. |
-| `Cox::Kdf` | I have a high quality master key and want to make subkeys. |
-| [`Cox::Cipher::Chalsa`](https://didactic-drunk.github.io/cox/Cox/Cipher/Chalsa.html) | What goes with guacamole? |
+| [`Sodium::Digest::Blake2b`](https://didactic-drunk.github.io/sodium.cr/Sodium/Digest::Blake2b.html) | I want to hash data fast and securely. |
+| `Sodium::Digest::SipHash` | I want to hash data really fast and less securely. (Not implemented yet) |
+| `Sodium::Pwhash` | I want to hash a password and store it. |
+| `Sodium::Pwhash` | I want to derive a key from a password. |
+| `Sodium::Kdf` | I have a high quality master key and want to make subkeys. |
+| [`Sodium::Cipher::Chalsa`](https://didactic-drunk.github.io/sodium.cr/Sodium/Cipher/Chalsa.html) | What goes with guacamole? |
 | Everything else | I want to design my own crypto protocol and probably do it wrong. |
 
 
@@ -84,15 +84,15 @@ The `specs` provide the best examples of how to use or misuse this shard.
 
 ### CryptoBox easy encryption
 ```crystal
-require "cox"
+require "sodium"
 
 data = "Hello World!"
 
 # Alice is the sender
-alice = Cox::CryptoBox::SecretKey.new
+alice = Sodium::CryptoBox::SecretKey.new
 
 # Bob is the recipient
-bob = Cox::CryptoBox::SecretKey.new
+bob = Sodium::CryptoBox::SecretKey.new
 
 # Precompute a shared secret between alice and bob.
 pair = alice.pair bob.public_key
@@ -105,7 +105,7 @@ nonce, encrypted = pair.encrypt data
 bob.pair alice.public_key do |pair|
   # Decrypt the message using Bob's secret key, and verify its signature against
   # Alice's public key
-  decrypted = Cox.decrypt(encrypted, nonce, alice.public, bob.secret)
+  decrypted = Sodium.decrypt(encrypted, nonce, alice.public, bob.secret)
 
   String.new(decrypted) # => "Hello World!"
 end
@@ -115,41 +115,41 @@ end
 ```crystal
 message = "Hello World!"
 
-secret_key = Cox::Sign::SecretKey.new
+secret_key = Sodium::Sign::SecretKey.new
 
 # Sign the message
 signature = secret_key.sign_detached message
 
 # Send secret_key.public_key to the recipient
 
-public_key = Cox::Sign::PublicKey.new key_bytes
+public_key = Sodium::Sign::PublicKey.new key_bytes
 
-# raises Cox::Error::VerificationFailed on failure.
+# raises Sodium::Error::VerificationFailed on failure.
 public_key.verify_detached message, signature
 ```
 
 ### Secret Key Encryption
 ```crystal
-key = Cox::SecretKey.new
+key = Sodium::SecretKey.new
 
 message = "foobar"
 encrypted, nonce = key.encrypt_easy message
 
 # On the other side.
-key = Cox::SecretKey.new key
+key = Sodium::SecretKey.new key
 message = key.decrypt_easy encrypted, nonce
 ```
 
 ### Blake2b
 ```crystal
-key = Bytes.new Cox::Digest::Blake2B::KEY_SIZE
-salt = Bytes.new Cox::Digest::Blake2B::SALT_SIZE
-personal = Bytes.new Cox::Digest::Blake2B::PERSONAL_SIZE
-out_size = 64 # bytes between Cox::Digest::Blake2B::OUT_SIZE_MIN and Cox::Digest::Blake2B::OUT_SIZE_MAX
+key = Bytes.new Sodium::Digest::Blake2B::KEY_SIZE
+salt = Bytes.new Sodium::Digest::Blake2B::SALT_SIZE
+personal = Bytes.new Sodium::Digest::Blake2B::PERSONAL_SIZE
+out_size = 64 # bytes between Sodium::Digest::Blake2B::OUT_SIZE_MIN and Sodium::Digest::Blake2B::OUT_SIZE_MAX
 data = "data".to_slice
 
 # output_size, key, salt, and personal are optional.
-digest = Cox::Digest::Blake2b.new out_size, key: key, salt: salt, personal: personal
+digest = Sodium::Digest::Blake2b.new out_size, key: key, salt: salt, personal: personal
 digest.update data
 output = d.hexdigest
 
@@ -160,7 +160,7 @@ output = d.hexdigest
 
 ### Key derivation
 ```crystal
-kdf = Cox::Kdf.new
+kdf = Sodium::Kdf.new
 
 # kdf.derive(8_byte_context, subkey_id, subkey_size)
 subkey1 = kdf.derive "context1", 0, 16
@@ -171,10 +171,10 @@ subkey4 = kdf.derive "context2", 1, 64
 
 ### Password Hashing
 ```crystal
-pwhash = Cox::Pwhash.new
+pwhash = Sodium::Pwhash.new
 
-pwhash.memlimit = Cox::Pwhash::MEMLIMIT_MIN
-pwhash.opslimit = Cox::Pwhash::OPSLIMIT_MIN
+pwhash.memlimit = Sodium::Pwhash::MEMLIMIT_MIN
+pwhash.opslimit = Sodium::Pwhash::OPSLIMIT_MIN
 
 pass = "1234"
 hash = pwhash.hash_str pass
@@ -203,7 +203,7 @@ Ops limit →
 
 ## Contributing
 
-1. Fork it ( https://github.com/didactic-drunk/cox/fork )
+1. Fork it ( https://github.com/didactic-drunk/sodium.cr/fork )
 2. **Install a formatting check git hook (ln -sf ../../scripts/git/pre-commit .git/hooks)**
 3. Create your feature branch (git checkout -b my-new-feature)
 4. Commit your changes (git commit -am 'Add some feature')
diff --git a/benchmarks/blake2b.cr b/benchmarks/blake2b.cr
index 566684f..fc16e03 100644
--- a/benchmarks/blake2b.cr
+++ b/benchmarks/blake2b.cr
@@ -1,5 +1,5 @@
 require "benchmark"
-require "../src/cox"
+require "../src/sodium"
 require "openssl"
 require "openssl/digest"
 
@@ -13,19 +13,19 @@ puts "'crystal run --release benchmarks/blake2b.cr sha1 sha256'"
 Benchmark.ips(warmup: 0.5) do |bm|
   sizes.each_with_index do |size, i|
     bm.report "blake2b new obj per iter #{size}" do
-      d = Cox::Digest::Blake2b.new 64
+      d = Sodium::Digest::Blake2b.new 64
       d.update bufs[i]
       d.digest
     end
 
-    d = Cox::Digest::Blake2b.new output_size
+    d = Sodium::Digest::Blake2b.new output_size
     bm.report "blake2b reset per iter #{size}" do
       d.reset
       d.update bufs[i]
       d.digest
     end
 
-    d = Cox::Digest::Blake2b.new output_size
+    d = Sodium::Digest::Blake2b.new output_size
     dst = Bytes.new d.digest_size
     bm.report "blake2b reset reusing buffer per iter #{size}" do
       d.reset
diff --git a/benchmarks/blake2b.txt b/benchmarks/blake2b.txt
index 44f5785..7db06ea 100644
--- a/benchmarks/blake2b.txt
+++ b/benchmarks/blake2b.txt
@@ -52,7 +52,7 @@ openssl speed -evp blake2b512 md5
   Doing md5 for 3s on 16384 size blocks: 125954 md5's in 2.99s
    
 
-# In all tests crystal Cox::Blake2b(512) beats crystal OpenSSL::Digest::SHA256.
+# In all tests crystal Sodium::Digest::Blake2b(512) beats crystal OpenSSL::Digest::SHA256.
 # Using .reset instead of creating new objects gives a significant performance boost when hashing small data sizes.
 # Reusing an output buffer with .reset gives a further performance boost when hashing small data sizes.
 # New objects have a significant penalty for hashing small data sizes.  Only problematic with iterative hashing or in a tight loop.
diff --git a/build/env.sh b/build/env.sh
index 65349ff..ad709a1 100644
--- a/build/env.sh
+++ b/build/env.sh
@@ -9,7 +9,7 @@ export MIN_LIBSODIUM_VERSION=1.0.18
 export LIBSODIUM_SHA256=6f504490b342a4f8a4c4a02fc9b866cbef8622d5df4e5452b46be121e46636c1
 
 
-[ ! -z "$COX_BUILD_DEBUG" ] && export COX_BUILD_VERBOSE=1
+[ ! -z "$SODIUM_BUILD_DEBUG" ] && export SODIUM_BUILD_VERBOSE=1
 
 function version { echo "$@" | awk -F. '{ printf("%d%03d%03d%03d\n", $1,$2,$3,$4); }'; }
 
@@ -17,13 +17,13 @@ if `pkg-config libsodium --exists`; then
 	PKG_VER=`pkg-config libsodium --modversion`
 
 	if [ $(version "$PKG_VER") -ge $(version "$MIN_LIBSODIUM_VERSION") ]; then
-		[ ! -z "$COX_BUILD_VERBOSE" ] && echo "Using packaged libsodium."
+		[ ! -z "$SODIUM_BUILD_VERBOSE" ] && echo "Using packaged libsodium."
 	else
-		[ ! -z "$COX_BUILD_VERBOSE" ] echo "System packaged libsodium is too old."
+		[ ! -z "$SODIUM_BUILD_VERBOSE" ] echo "System packaged libsodium is too old."
 		export LIBSODIUM_INSTALL=1
 	fi
 else
-	[ ! -z "$COX_BUILD_VERBOSE" ] && echo "Missing libsodium system package."
+	[ ! -z "$SODIUM_BUILD_VERBOSE" ] && echo "Missing libsodium system package."
 	export LIBSODIUM_INSTALL=1
 fi
 
diff --git a/build/libsodium_install.sh b/build/libsodium_install.sh
index 32f0421..5585c68 100755
--- a/build/libsodium_install.sh
+++ b/build/libsodium_install.sh
@@ -12,8 +12,8 @@ set -e
 
 #export LIBSODIUM_INSTALL=1
 if [ "$LIBSODIUM_INSTALL" != "1" ]; then
-	[ ! -z "$COX_BUILD_VERBOSE" ] echo "Skipping libsodium build."
-	exit
+	[ ! -z "$SODIUM_BUILD_VERBOSE" ] && echo "Skipping libsodium build."
+	exit 0
 fi
 
 
@@ -22,7 +22,7 @@ cd "$LIBSODIUM_BUILD_DIR"
 
 
 if [ ! -f "$LIBSODIUM_INSTALL_PATH/include/sodium.h" ]; then
-	[ ! -z "$COX_BUILD_DEBUG" ] && set -x
+	[ ! -z "$SODIUM_BUILD_DEBUG" ] && set -x
 
 	DIRNAME=libsodium-"$MIN_LIBSODIUM_VERSION"
 	TGZ_FILENAME="$DIRNAME".tar.gz
@@ -58,11 +58,11 @@ if [ ! -f "$LIBSODIUM_INSTALL_PATH/include/sodium.h" ]; then
 		touch .make.install.done
 	fi
 
-	[ ! -z "$COX_BUILD_VERBOSE" ] && echo "Finished building libsodium."
+	[ ! -z "$SODIUM_BUILD_VERBOSE" ] && echo "Finished building libsodium."
 else
 #	find "$LIBSODIUM_INSTALL_PATH"
 
-	[ ! -z "$COX_BUILD_VERBOSE" ] && echo "Using already built libsodium."
+	[ ! -z "$SODIUM_BUILD_VERBOSE" ] && echo "Using already built libsodium."
 fi
 
 exit 0
diff --git a/examples/pwhash_selector.cr b/examples/pwhash_selector.cr
index 36e8d60..6fe30d1 100644
--- a/examples/pwhash_selector.cr
+++ b/examples/pwhash_selector.cr
@@ -1,5 +1,4 @@
-require "../src/cox"
-require "tallboy"
+require "../src/sodium"
 
 if ARGV.empty?
   puts "Help select Pwhash ops/mem limits for your application."
@@ -15,8 +14,8 @@ time_limit = if t = ARGV.shift?
              else
                time_min * 4
              end
-mem_limit = (ARGV.shift?.try &.to_i || (Cox::Pwhash::MEMLIMIT_MAX)).to_u64
-pwhash = Cox::Pwhash.new
+mem_limit = (ARGV.shift?.try &.to_i || (Sodium::Pwhash::MEMLIMIT_MAX)).to_u64
+pwhash = Sodium::Pwhash.new
 pass = "1234"
 
 # data = Array(Array({UInt64, UInt64, Float64})).new
@@ -36,9 +35,9 @@ def bytes_str(b)
   "%5d#{suffix}" % b
 end
 
-pwhash.memlimit = Cox::Pwhash::MEMLIMIT_MIN
+pwhash.memlimit = Sodium::Pwhash::MEMLIMIT_MIN
 loop do
-  pwhash.opslimit = Cox::Pwhash::OPSLIMIT_MIN
+  pwhash.opslimit = Sodium::Pwhash::OPSLIMIT_MIN
   row = ["%5dK" % (pwhash.memlimit / 1024)]
   data << row
 
@@ -72,7 +71,7 @@ loop do
   puts ""
 
   break if pwhash.memlimit >= mem_limit
-  break if pwhash.opslimit == Cox::Pwhash::OPSLIMIT_MIN # Couldn't get past 1 iteration before going over time.
+  break if pwhash.opslimit == Sodium::Pwhash::OPSLIMIT_MIN # Couldn't get past 1 iteration before going over time.
   pwhash.memlimit *= 4
 end
 # header << "Ops limit"
diff --git a/shard.yml b/shard.yml
index 7d0da18..1ff131e 100644
--- a/shard.yml
+++ b/shard.yml
@@ -1,4 +1,4 @@
-name: cox
+name: sodium.cr
 version: 0.1.0
 
 authors:
@@ -8,6 +8,6 @@ development_dependencies:
   ghshard:
     github: bcardiff/ghshard
 
-crystal: 0.24.1
+crystal: 0.28.0
 
 license: MIT
diff --git a/spec/cox_spec.cr b/spec/cox_spec.cr
index d1e56e8..ef80fe0 100644
--- a/spec/cox_spec.cr
+++ b/spec/cox_spec.cr
@@ -1,6 +1,6 @@
 require "./spec_helper"
 
-describe Cox do
+describe Sodium do
   # Finished in 71 microseconds
   # 1 examples, 2 failures, 5 errors, 0 pending
   # What a man.
diff --git a/spec/cox/blake2b_spec.cr b/spec/sodium/blake2b_spec.cr
similarity index 68%
rename from spec/cox/blake2b_spec.cr
rename to spec/sodium/blake2b_spec.cr
index cff3f3c..9d22e0e 100644
--- a/spec/cox/blake2b_spec.cr
+++ b/spec/sodium/blake2b_spec.cr
@@ -23,10 +23,10 @@ test_vectors = [
   },
 ]
 
-describe Cox::Digest::Blake2b do
+describe Sodium::Digest::Blake2b do
   it "libsodium comparisons" do
     libsodium_comparisons.each do |vec|
-      d = Cox::Digest::Blake2b.new vec[:out_size], key: vec[:key].try(&.hexbytes)
+      d = Sodium::Digest::Blake2b.new vec[:out_size], key: vec[:key].try(&.hexbytes)
       d.update vec[:input].hexbytes
       d.hexdigest.should eq vec[:output]
     end
@@ -34,31 +34,31 @@ describe Cox::Digest::Blake2b do
 
   it "test vectors" do
     test_vectors.each do |vec|
-      d = Cox::Digest::Blake2b.new 64, key: vec[:key].hexbytes
+      d = Sodium::Digest::Blake2b.new 64, key: vec[:key].hexbytes
       d.update vec[:input].hexbytes
       d.hexdigest.should eq vec[:output]
     end
   end
 
   it "produces different output with different salt or personal params" do
-    key = Bytes.new Cox::Digest::Blake2b::KEY_SIZE
-    salt = Bytes.new Cox::Digest::Blake2b::SALT_SIZE
-    salt2 = Bytes.new Cox::Digest::Blake2b::SALT_SIZE
+    key = Bytes.new Sodium::Digest::Blake2b::KEY_SIZE
+    salt = Bytes.new Sodium::Digest::Blake2b::SALT_SIZE
+    salt2 = Bytes.new Sodium::Digest::Blake2b::SALT_SIZE
     salt2 = salt.dup
     salt2[0] = 1
-    personal = Bytes.new Cox::Digest::Blake2b::PERSONAL_SIZE
+    personal = Bytes.new Sodium::Digest::Blake2b::PERSONAL_SIZE
     personal2 = personal.dup
     personal2[0] = 1
 
-    d = Cox::Digest::Blake2b.new key: key, salt: salt, personal: personal
+    d = Sodium::Digest::Blake2b.new key: key, salt: salt, personal: personal
     d.update "foo".to_slice
     output = d.hexdigest
 
-    d = Cox::Digest::Blake2b.new key: key, salt: salt2, personal: personal
+    d = Sodium::Digest::Blake2b.new key: key, salt: salt2, personal: personal
     d.update "foo".to_slice
     saltout = d.hexdigest
 
-    d = Cox::Digest::Blake2b.new key: key, salt: salt, personal: personal2
+    d = Sodium::Digest::Blake2b.new key: key, salt: salt, personal: personal2
     d.update "foo".to_slice
     personalout = d.hexdigest
 
@@ -69,19 +69,19 @@ describe Cox::Digest::Blake2b do
 
   it "raises on invalid " do
     expect_raises ArgumentError do
-      Cox::Digest::Blake2b.new key: Bytes.new(128)
+      Sodium::Digest::Blake2b.new key: Bytes.new(128)
     end
 
     expect_raises ArgumentError do
-      Cox::Digest::Blake2b.new salt: Bytes.new(1)
+      Sodium::Digest::Blake2b.new salt: Bytes.new(1)
     end
 
     expect_raises ArgumentError do
-      Cox::Digest::Blake2b.new salt: Bytes.new(128)
+      Sodium::Digest::Blake2b.new salt: Bytes.new(128)
     end
 
     expect_raises ArgumentError do
-      Cox::Digest::Blake2b.new personal: Bytes.new(128)
+      Sodium::Digest::Blake2b.new personal: Bytes.new(128)
     end
   end
 end
diff --git a/spec/cox/cipher/chalsa_spec.cr b/spec/sodium/cipher/chalsa_spec.cr
similarity index 73%
rename from spec/cox/cipher/chalsa_spec.cr
rename to spec/sodium/cipher/chalsa_spec.cr
index 70df4e2..fc94568 100644
--- a/spec/cox/cipher/chalsa_spec.cr
+++ b/spec/sodium/cipher/chalsa_spec.cr
@@ -1,13 +1,13 @@
 require "../../spec_helper"
-require "../../../src/cox/cipher/chalsa"
+require "../../../src/sodium/cipher/chalsa"
 
 {% for name in %w(XSalsa20 Salsa20 XChaCha20 ChaCha20Ietf ChaCha20) %}
 # TODO: verify against test vectors.
-  describe Cox::Cipher::{{ name.id }} do
+  describe Sodium::Cipher::{{ name.id }} do
     it "xors" do
       data = Bytes.new(100)
-      cipher1 = Cox::Cipher::{{ name.id }}.new
-      cipher2 = Cox::Cipher::{{ name.id }}.new
+      cipher1 = Sodium::Cipher::{{ name.id }}.new
+      cipher2 = Sodium::Cipher::{{ name.id }}.new
       key = cipher1.random_key
       nonce = cipher1.random_nonce
       output = cipher1.update data
diff --git a/spec/cox/crypto_box/secret_key_spec.cr b/spec/sodium/crypto_box/secret_key_spec.cr
similarity index 82%
rename from spec/cox/crypto_box/secret_key_spec.cr
rename to spec/sodium/crypto_box/secret_key_spec.cr
index c4bcc88..542c9b5 100644
--- a/spec/cox/crypto_box/secret_key_spec.cr
+++ b/spec/sodium/crypto_box/secret_key_spec.cr
@@ -1,14 +1,14 @@
 require "../../spec_helper"
 
-describe Cox::CryptoBox::SecretKey do
+describe Sodium::CryptoBox::SecretKey do
   it "easy encrypt/decrypt" do
     data = "Hello World!"
 
     # Alice is the sender
-    alice = Cox::CryptoBox::SecretKey.new
+    alice = Sodium::CryptoBox::SecretKey.new
 
     # Bob is the recipient
-    bob = Cox::CryptoBox::SecretKey.new
+    bob = Sodium::CryptoBox::SecretKey.new
 
     # Encrypt a message for Bob using his public key, signing it with Alice's
     # secret key
diff --git a/spec/cox/kdf_spec.cr b/spec/sodium/kdf_spec.cr
similarity index 78%
rename from spec/cox/kdf_spec.cr
rename to spec/sodium/kdf_spec.cr
index 368689a..67bf2e0 100644
--- a/spec/cox/kdf_spec.cr
+++ b/spec/sodium/kdf_spec.cr
@@ -2,12 +2,12 @@ require "../spec_helper"
 
 CONTEXT = "8_bytess"
 
-describe Cox::Kdf do
+describe Sodium::Kdf do
   it "generates master key" do
-    kdf1 = Cox::Kdf.new
+    kdf1 = Sodium::Kdf.new
 
     # verify loading saved key
-    kdf2 = Cox::Kdf.from_base64 kdf1.to_base64
+    kdf2 = Sodium::Kdf.from_base64 kdf1.to_base64
 
     # verify generated subkey's are the same after loading
     key1_s1 = kdf1.derive CONTEXT, 0, 16
@@ -16,7 +16,7 @@ describe Cox::Kdf do
   end
 
   it "generates different keys" do
-    kdf1 = Cox::Kdf.new
+    kdf1 = Sodium::Kdf.new
     subkey1 = kdf1.derive CONTEXT, 0, 16
     subkey2 = kdf1.derive CONTEXT, 1, 16
     subkey1.should_not eq subkey2
diff --git a/spec/cox/pwhash_spec.cr b/spec/sodium/pwhash_spec.cr
similarity index 75%
rename from spec/cox/pwhash_spec.cr
rename to spec/sodium/pwhash_spec.cr
index 9de69a7..3a049d2 100644
--- a/spec/cox/pwhash_spec.cr
+++ b/spec/sodium/pwhash_spec.cr
@@ -1,27 +1,27 @@
 require "../spec_helper"
 
 private def pw_min
-  pwhash = Cox::Pwhash.new
+  pwhash = Sodium::Pwhash.new
 
   # set to minimum to speed up tests
-  pwhash.memlimit = Cox::Pwhash::MEMLIMIT_MIN
-  pwhash.opslimit = Cox::Pwhash::OPSLIMIT_MIN
+  pwhash.memlimit = Sodium::Pwhash::MEMLIMIT_MIN
+  pwhash.opslimit = Sodium::Pwhash::OPSLIMIT_MIN
   pwhash
 end
 
-describe Cox::Pwhash do
+describe Sodium::Pwhash do
   it "hashes and verifies a password" do
     pwhash = pw_min
 
     pass = "1234"
     hash = pwhash.store pass
     pwhash.verify hash, pass
-    expect_raises(Cox::Pwhash::PasswordVerifyError) do
+    expect_raises(Sodium::Pwhash::PasswordVerifyError) do
       pwhash.verify hash, "5678"
     end
 
     pwhash.needs_rehash?(hash).should be_false
-    pwhash.opslimit = Cox::Pwhash::OPSLIMIT_MAX
+    pwhash.opslimit = Sodium::Pwhash::OPSLIMIT_MAX
     pwhash.needs_rehash?(hash).should be_true
   end
 
@@ -34,7 +34,7 @@ describe Cox::Pwhash do
 
   it "derives a key from a password" do
     pwhash = pw_min
-    pwhash.algorithm = Cox::Pwhash::Algorithm::Argon2id13
+    pwhash.algorithm = Sodium::Pwhash::Algorithm::Argon2id13
     salt = pwhash.salt
     key1 = pwhash.key_derive salt, "foo", 16
     key2 = pwhash.key_derive salt, "foo", 16
diff --git a/spec/cox/secret_box_spec.cr b/spec/sodium/secret_box_spec.cr
similarity index 72%
rename from spec/cox/secret_box_spec.cr
rename to spec/sodium/secret_box_spec.cr
index 52203e6..c751b50 100644
--- a/spec/cox/secret_box_spec.cr
+++ b/spec/sodium/secret_box_spec.cr
@@ -1,15 +1,15 @@
 require "../spec_helper"
 
-describe Cox::SecretBox do
+describe Sodium::SecretBox do
   it "encrypts/decrypts" do
-    key = Cox::SecretBox.new
+    key = Sodium::SecretBox.new
 
     message = "foobar"
     encrypted, nonce = key.encrypt_easy message
     decrypted = key.decrypt_easy encrypted, nonce
     message.should eq String.new(decrypted)
 
-    expect_raises(Cox::Error::DecryptionFailed) do
+    expect_raises(Sodium::Error::DecryptionFailed) do
       key.decrypt_easy "badmsgbadmsgbadmsgbadmsgbadmsg".to_slice, nonce
     end
   end
diff --git a/spec/cox/sign/secret_key.cr b/spec/sodium/sign/secret_key.cr
similarity index 60%
rename from spec/cox/sign/secret_key.cr
rename to spec/sodium/sign/secret_key.cr
index 6d91c12..5c3299e 100644
--- a/spec/cox/sign/secret_key.cr
+++ b/spec/sodium/sign/secret_key.cr
@@ -1,10 +1,10 @@
 require "../../spec_helper"
-require "../../../src/cox/sign/secret_key"
+require "../../../src/sodium/sign/secret_key"
 
-describe Cox::Sign::SecretKey do
+describe Sodium::Sign::SecretKey do
   it "signs and verifies" do
     message = "foo"
-    skey = Cox::Sign::SecretKey.new
+    skey = Sodium::Sign::SecretKey.new
     sig = skey.sign_detached message
 
     skey.public_key.verify_detached message, sig
@@ -12,10 +12,10 @@ describe Cox::Sign::SecretKey do
 
   it "signs and fails" do
     message = "foo"
-    skey = Cox::Sign::SecretKey.new
+    skey = Sodium::Sign::SecretKey.new
     sig = skey.sign_detached message
 
-    expect_raises Cox::Error::VerificationFailed do
+    expect_raises Sodium::Error::VerificationFailed do
       skey.public_key.verify_detached "bar", sig
     end
   end
diff --git a/spec/spec_helper.cr b/spec/spec_helper.cr
index 21974ee..4ee79af 100644
--- a/spec/spec_helper.cr
+++ b/spec/spec_helper.cr
@@ -1,2 +1,2 @@
 require "spec"
-require "../src/cox"
+require "../src/sodium"
diff --git a/src/cox.cr b/src/sodium.cr
similarity index 79%
rename from src/cox.cr
rename to src/sodium.cr
index 42f8fec..3ab1381 100644
--- a/src/cox.cr
+++ b/src/sodium.cr
@@ -1,6 +1,6 @@
 require "random/secure"
 
-module Cox
+module Sodium
   class Error < ::Exception
     class VerificationFailed < Error
     end
@@ -14,8 +14,8 @@ module Cox
   end
 end
 
-require "./cox/**"
+require "./sodium/**"
 
-if Cox::LibSodium.sodium_init == -1
+if Sodium::LibSodium.sodium_init == -1
   abort "Failed to init libsodium"
 end
diff --git a/src/cox/cipher/chalsa.cr b/src/sodium/cipher/chalsa.cr
similarity index 90%
rename from src/cox/cipher/chalsa.cr
rename to src/sodium/cipher/chalsa.cr
index 0fc485f..234c441 100644
--- a/src/cox/cipher/chalsa.cr
+++ b/src/sodium/cipher/chalsa.cr
@@ -1,6 +1,6 @@
 require "../lib_sodium"
 
-module Cox::Cipher
+module Sodium::Cipher
   # The great beat you can eat!
   #
   # What? They're both dance?
@@ -69,7 +69,7 @@ module Cox::Cipher
     #
     # This class mimicks the OpenSSL::Cipher interface with minor differences.
     #
-    # See `spec/cox/cipher/chalsa_spec.cr` for examples on how to use this class.
+    # See `spec/sodium/cipher/chalsa_spec.cr` for examples on how to use this class.
     class {{ key.id }} < Chalsa
       # Xor's src with the cipher output and places in dst.
       #
@@ -78,12 +78,12 @@ module Cox::Cipher
         if (key = @key) && (nonce = @nonce)
           raise ArgumentError.new("src and dst bytesize must be identical") if src.bytesize != dst.bytesize
           if LibSodium.crypto_stream_{{ val.id }}_xor_ic(dst, src, src.bytesize, nonce, @offset, key) != 0
-            raise Cox::Error.new("crypto_stream_{{ val.id }}_xor_ic")
+            raise Sodium::Error.new("crypto_stream_{{ val.id }}_xor_ic")
           end
           @offset += src.bytesize
           dst
         else
-          raise Cox::Error.new("key and nonce must be set before calling update #{@key.nil?} #{@nonce.nil?}")
+          raise Sodium::Error.new("key and nonce must be set before calling update #{@key.nil?} #{@nonce.nil?}")
         end
       end
 
diff --git a/src/cox/crypto_box/pair.cr b/src/sodium/crypto_box/pair.cr
similarity index 97%
rename from src/cox/crypto_box/pair.cr
rename to src/sodium/crypto_box/pair.cr
index 18567d8..485d24f 100644
--- a/src/cox/crypto_box/pair.cr
+++ b/src/sodium/crypto_box/pair.cr
@@ -1,6 +1,6 @@
 require "../lib_sodium"
 
-module Cox::CryptoBox
+module Sodium::CryptoBox
   class Pair
     include Wipe
 
diff --git a/src/cox/crypto_box/public_key.cr b/src/sodium/crypto_box/public_key.cr
similarity index 92%
rename from src/cox/crypto_box/public_key.cr
rename to src/sodium/crypto_box/public_key.cr
index 41af091..64b095e 100644
--- a/src/cox/crypto_box/public_key.cr
+++ b/src/sodium/crypto_box/public_key.cr
@@ -1,6 +1,6 @@
 require "../lib_sodium"
 
-module Cox::CryptoBox
+module Sodium::CryptoBox
   class PublicKey < Key
     include Wipe
     KEY_SIZE = LibSodium::PUBLIC_KEY_SIZE
diff --git a/src/cox/crypto_box/secret_key.cr b/src/sodium/crypto_box/secret_key.cr
similarity index 97%
rename from src/cox/crypto_box/secret_key.cr
rename to src/sodium/crypto_box/secret_key.cr
index 599c3f4..98e012a 100644
--- a/src/cox/crypto_box/secret_key.cr
+++ b/src/sodium/crypto_box/secret_key.cr
@@ -1,6 +1,6 @@
 require "../lib_sodium"
 
-module Cox::CryptoBox
+module Sodium::CryptoBox
   class SecretKey < Key
     include Wipe
     KEY_SIZE = LibSodium::SECRET_KEY_SIZE
diff --git a/src/cox/digest/blake2b.cr b/src/sodium/digest/blake2b.cr
similarity index 93%
rename from src/cox/digest/blake2b.cr
rename to src/sodium/digest/blake2b.cr
index 61af3c4..ef70e61 100644
--- a/src/cox/digest/blake2b.cr
+++ b/src/sodium/digest/blake2b.cr
@@ -1,6 +1,6 @@
 require "openssl/digest/digest_base"
 
-module Cox::Digest
+module Sodium::Digest
   class Blake2b
     # provides copying digest/hexdigest methods
     include OpenSSL::DigestBase
@@ -57,13 +57,13 @@ module Cox::Digest
       personal = @have_personal ? @personal.to_unsafe : nil
 
       if LibSodium.crypto_generichash_blake2b_init_salt_personal(@state, key, @key_size, @digest_size, salt, personal) != 0
-        raise Cox::Error.new("blake2b_init_key_salt_personal")
+        raise Sodium::Error.new("blake2b_init_key_salt_personal")
       end
     end
 
     def update(data : Bytes)
       if LibSodium.crypto_generichash_blake2b_update(@state, data, data.bytesize) != 0
-        raise Cox::Error.new("crypto_generichash_blake2b_update")
+        raise Sodium::Error.new("crypto_generichash_blake2b_update")
       end
 
       self
@@ -81,7 +81,7 @@ module Cox::Digest
     # Use .digest or .hexdigest instead.
     def finish(dst : Bytes) : Bytes
       if LibSodium.crypto_generichash_blake2b_final(@state, dst, dst.bytesize) != 0
-        raise Cox::Error.new("crypto_generichash_blake2b_final")
+        raise Sodium::Error.new("crypto_generichash_blake2b_final")
       end
 
       dst
diff --git a/src/cox/kdf.cr b/src/sodium/kdf.cr
similarity index 88%
rename from src/cox/kdf.cr
rename to src/sodium/kdf.cr
index 61e7cdb..fac7b78 100644
--- a/src/cox/kdf.cr
+++ b/src/sodium/kdf.cr
@@ -1,4 +1,4 @@
-module Cox
+module Sodium
   class Kdf
     property bytes : Bytes
 
@@ -25,7 +25,7 @@ module Cox
 
       subkey = Bytes.new subkey_size
       if (ret = LibSodium.crypto_kdf_derive_from_key(subkey, subkey.bytesize, subkey_id, context, @bytes)) != 0
-        raise Cox::Error.new("crypto_kdf_derive_from_key returned #{ret} (subkey size is probably out of range)")
+        raise Sodium::Error.new("crypto_kdf_derive_from_key returned #{ret} (subkey size is probably out of range)")
       end
       subkey
     end
diff --git a/src/cox/key.cr b/src/sodium/key.cr
similarity index 94%
rename from src/cox/key.cr
rename to src/sodium/key.cr
index 70dfa8e..4a6298a 100644
--- a/src/cox/key.cr
+++ b/src/sodium/key.cr
@@ -1,4 +1,4 @@
-module Cox
+module Sodium
   abstract class Key
     abstract def bytes
 
diff --git a/src/cox/lib_sodium.cr b/src/sodium/lib_sodium.cr
similarity index 99%
rename from src/cox/lib_sodium.cr
rename to src/sodium/lib_sodium.cr
index 7d75c03..c30d9ec 100644
--- a/src/cox/lib_sodium.cr
+++ b/src/sodium/lib_sodium.cr
@@ -1,4 +1,4 @@
-module Cox
+module Sodium
   @[Link(ldflags: "`#{__DIR__}/../../build/pkg-libs.sh #{__DIR__}/../..`")]
   lib LibSodium
     fun sodium_init : LibC::Int
diff --git a/src/cox/nonce.cr b/src/sodium/nonce.cr
similarity index 96%
rename from src/cox/nonce.cr
rename to src/sodium/nonce.cr
index 53dcc58..1919466 100644
--- a/src/cox/nonce.cr
+++ b/src/sodium/nonce.cr
@@ -1,7 +1,7 @@
 require "./lib_sodium"
 require "random/secure"
 
-module Cox
+module Sodium
   class Nonce
     NONCE_SIZE = LibSodium::NONCE_SIZE
 
diff --git a/src/cox/pwhash.cr b/src/sodium/pwhash.cr
similarity index 93%
rename from src/cox/pwhash.cr
rename to src/sodium/pwhash.cr
index 815284a..5b5fbdf 100644
--- a/src/cox/pwhash.cr
+++ b/src/sodium/pwhash.cr
@@ -1,11 +1,11 @@
-module Cox
+module Sodium
   # [Argon2 Password Hashing](https://libsodium.gitbook.io/doc/password_hashing/the_argon2i_function)
   # * #store #verify #needs_rehash? are used together for password verification.
   # * #key_derive is used on it's own to generate password based keys.
   #
   # See `examples/pwhash_selector.cr` for help on selecting parameters.
   class Pwhash
-    class PasswordVerifyError < Cox::Error
+    class PasswordVerifyError < Sodium::Error
     end
 
     OPSLIMIT_MIN         = LibSodium.crypto_pwhash_opslimit_min
@@ -39,7 +39,7 @@ module Cox
     def store(pass)
       outstr = Bytes.new LibSodium::PWHASH_STR_SIZE
       if LibSodium.crypto_pwhash_str(outstr, pass, pass.bytesize, @opslimit, @memlimit) != 0
-        raise Cox::Error.new("crypto_pwhash_str")
+        raise Sodium::Error.new("crypto_pwhash_str")
       end
       outstr
     end
@@ -65,7 +65,7 @@ module Cox
       when 1
         true
       else
-        raise Cox::Error.new("crypto_pwhash_str_needs_rehash")
+        raise Sodium::Error.new("crypto_pwhash_str_needs_rehash")
       end
     end
 
@@ -76,7 +76,7 @@ module Cox
       if alg = algorithm
         key = Bytes.new key_bytes
         if LibSodium.crypto_pwhash(key, key.bytesize, pass, pass.bytesize, salt, @opslimit, @memlimit, alg) != 0
-          raise Cox::Error.new("crypto_pwhash_str")
+          raise Sodium::Error.new("crypto_pwhash_str")
         end
         key
       else
diff --git a/src/cox/secret_box.cr b/src/sodium/secret_box.cr
similarity index 86%
rename from src/cox/secret_box.cr
rename to src/sodium/secret_box.cr
index 59ebf55..53adf65 100644
--- a/src/cox/secret_box.cr
+++ b/src/sodium/secret_box.cr
@@ -1,15 +1,15 @@
 require "./lib_sodium"
 
-module Cox
+module Sodium
   # [https://libsodium.gitbook.io/doc/secret-key_cryptography](https://libsodium.gitbook.io/doc/secret-key_cryptography)
   #
   # ```crystal
-  # key = Cox::SecretKey.new
+  # key = Sodium::SecretKey.new
   # message = "foobar"
   # encrypted, nonce = key.encrypt_easy message
   #
   # # On the other side.
-  # key = Cox::SecretKey.new key
+  # key = Sodium::SecretKey.new key
   # message = key.decrypt_easy encrypted, nonce
   # ```
   class SecretBox < Key
@@ -54,14 +54,14 @@ module Cox
         raise ArgumentError.new("dst.bytesize must be src.bytesize + MAC_SIZE, got #{dst.bytesize}")
       end
       if LibSodium.crypto_secretbox_easy(dst, src, src.bytesize, nonce.to_slice, @bytes) != 0
-        raise Cox::Error.new("crypto_secretbox_easy")
+        raise Sodium::Error.new("crypto_secretbox_easy")
       end
       dst
     end
 
     def decrypt_easy(data : Bytes, nonce : Nonce) : Bytes
       output_size = data.bytesize - MAC_SIZE
-      raise Cox::Error::DecryptionFailed.new("encrypted data too small #{data.bytesize}") if output_size <= 0
+      raise Sodium::Error::DecryptionFailed.new("encrypted data too small #{data.bytesize}") if output_size <= 0
       output = Bytes.new output_size
       decrypt_easy(data, output, nonce)
     end
@@ -71,7 +71,7 @@ module Cox
         raise ArgumentError.new("dst.bytesize must be src.bytesize - MAC_SIZE, got #{dst.bytesize}")
       end
       if LibSodium.crypto_secretbox_open_easy(dst, src, src.bytesize, nonce.to_slice, @bytes) != 0
-        raise Cox::Error::DecryptionFailed.new("crypto_secretbox_easy")
+        raise Sodium::Error::DecryptionFailed.new("crypto_secretbox_easy")
       end
       dst
     end
diff --git a/src/cox/sign/public_key.cr b/src/sodium/sign/public_key.cr
similarity index 89%
rename from src/cox/sign/public_key.cr
rename to src/sodium/sign/public_key.cr
index b4220cf..8b063f2 100644
--- a/src/cox/sign/public_key.cr
+++ b/src/sodium/sign/public_key.cr
@@ -1,6 +1,6 @@
 require "../lib_sodium"
 
-module Cox
+module Sodium
   class Sign::PublicKey < Key
     include Wipe
     KEY_SIZE = LibSodium::PUBLIC_SIGN_SIZE
@@ -24,7 +24,7 @@ module Cox
 
       v = LibSodium.crypto_sign_verify_detached sig, message, message.bytesize, @bytes
       if v != 0
-        raise Cox::Error::VerificationFailed.new("crypto_sign_verify_detached")
+        raise Sodium::Error::VerificationFailed.new("crypto_sign_verify_detached")
       end
     end
   end
diff --git a/src/cox/sign/secret_key.cr b/src/sodium/sign/secret_key.cr
similarity index 96%
rename from src/cox/sign/secret_key.cr
rename to src/sodium/sign/secret_key.cr
index 2e10001..2f5b6e8 100644
--- a/src/cox/sign/secret_key.cr
+++ b/src/sodium/sign/secret_key.cr
@@ -1,7 +1,7 @@
 require "../lib_sodium"
 
-module Cox
-  class Sign::SecretKey < Cox::Key
+module Sodium
+  class Sign::SecretKey < Sodium::Key
     include Wipe
     KEY_SIZE = LibSodium::SECRET_SIGN_SIZE
 
diff --git a/src/cox/version.cr b/src/sodium/version.cr
similarity index 63%
rename from src/cox/version.cr
rename to src/sodium/version.cr
index 9e380cd..83bf696 100644
--- a/src/cox/version.cr
+++ b/src/sodium/version.cr
@@ -1,3 +1,3 @@
-module Cox
+module Sodium
   VERSION = "0.1.0"
 end
diff --git a/src/cox/wipe.cr b/src/sodium/wipe.cr
similarity index 84%
rename from src/cox/wipe.cr
rename to src/sodium/wipe.cr
index 8073907..1735411 100644
--- a/src/cox/wipe.cr
+++ b/src/sodium/wipe.cr
@@ -1,4 +1,4 @@
-module Cox::Wipe
+module Sodium::Wipe
   @closed = false
 
   def close
@@ -9,7 +9,7 @@ module Cox::Wipe
 
   protected def wipe
     return if @closed
-    Cox.memzero @bytes
+    Sodium.memzero @bytes
   end
 
   def finalize