diff --git a/README.md b/README.md
index 5c75f6b..0798f49 100644
--- a/README.md
+++ b/README.md
@@ -65,16 +65,16 @@ dependencies:
 | Class | |
 | --- | --- |
 | `CryptoBox` `Sign` `SecretBox` | I don't know much about crypto. |
-| `Cox::CryptoBox::PrivateKey` | I want to encrypt + authenticate data using public key encryption. |
-| `Cox::Sign::PrivateKey` | I want to sign or verify messages without encryption. |
-| `Cox::SecretBox` | 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::Blake2b` | I want to hash data fast and securely. |
-| `Cox::SipHash` | I want to hash data really fast and less securely. (not implemented yet) |
+| [`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. |
+| 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` | What goes with guacamole? |
+| [`Cox::Cipher::Chalsa`](https://didactic-drunk.github.io/cox/Cox/Cipher/Chalsa.html) | What goes with guacamole? |
 | Everything else | I want to design my own crypto protocol and probably do it wrong. |
 
 
@@ -142,14 +142,14 @@ message = key.decrypt_easy encrypted, nonce
 
 ### Blake2b
 ```crystal
-key = Bytes.new Cox::Blake2B::KEY_SIZE
-salt = Bytes.new Cox::Blake2B::SALT_SIZE
-personal = Bytes.new Cox::Blake2B::PERSONAL_SIZE
-out_size = 64 # bytes between Cox::Blake2B::OUT_SIZE_MIN and Cox::Blake2B::OUT_SIZE_MAX
+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
 data = "data".to_slice
 
 # output_size, key, salt, and personal are optional.
-digest = Cox::Blake2b.new out_size, key: key, salt: salt, personal: personal
+digest = Cox::Digest::Blake2b.new out_size, key: key, salt: salt, personal: personal
 digest.update data
 output = d.hexdigest
 
diff --git a/benchmarks/blake2b.cr b/benchmarks/blake2b.cr
index 8b2eed6..566684f 100644
--- a/benchmarks/blake2b.cr
+++ b/benchmarks/blake2b.cr
@@ -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::Blake2b.new 64
+      d = Cox::Digest::Blake2b.new 64
       d.update bufs[i]
       d.digest
     end
 
-    d = Cox::Blake2b.new output_size
+    d = Cox::Digest::Blake2b.new output_size
     bm.report "blake2b reset per iter #{size}" do
       d.reset
       d.update bufs[i]
       d.digest
     end
 
-    d = Cox::Blake2b.new output_size
+    d = Cox::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/spec/cox/blake2b_spec.cr b/spec/cox/blake2b_spec.cr
index c17ac05..cff3f3c 100644
--- a/spec/cox/blake2b_spec.cr
+++ b/spec/cox/blake2b_spec.cr
@@ -23,10 +23,10 @@ test_vectors = [
   },
 ]
 
-describe Cox::Blake2b do
+describe Cox::Digest::Blake2b do
   it "libsodium comparisons" do
     libsodium_comparisons.each do |vec|
-      d = Cox::Blake2b.new vec[:out_size], key: vec[:key].try(&.hexbytes)
+      d = Cox::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::Blake2b do
 
   it "test vectors" do
     test_vectors.each do |vec|
-      d = Cox::Blake2b.new 64, key: vec[:key].hexbytes
+      d = Cox::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::Blake2b::KEY_SIZE
-    salt = Bytes.new Cox::Blake2b::SALT_SIZE
-    salt2 = Bytes.new Cox::Blake2b::SALT_SIZE
+    key = Bytes.new Cox::Digest::Blake2b::KEY_SIZE
+    salt = Bytes.new Cox::Digest::Blake2b::SALT_SIZE
+    salt2 = Bytes.new Cox::Digest::Blake2b::SALT_SIZE
     salt2 = salt.dup
     salt2[0] = 1
-    personal = Bytes.new Cox::Blake2b::PERSONAL_SIZE
+    personal = Bytes.new Cox::Digest::Blake2b::PERSONAL_SIZE
     personal2 = personal.dup
     personal2[0] = 1
 
-    d = Cox::Blake2b.new key: key, salt: salt, personal: personal
+    d = Cox::Digest::Blake2b.new key: key, salt: salt, personal: personal
     d.update "foo".to_slice
     output = d.hexdigest
 
-    d = Cox::Blake2b.new key: key, salt: salt2, personal: personal
+    d = Cox::Digest::Blake2b.new key: key, salt: salt2, personal: personal
     d.update "foo".to_slice
     saltout = d.hexdigest
 
-    d = Cox::Blake2b.new key: key, salt: salt, personal: personal2
+    d = Cox::Digest::Blake2b.new key: key, salt: salt, personal: personal2
     d.update "foo".to_slice
     personalout = d.hexdigest
 
@@ -69,19 +69,19 @@ describe Cox::Blake2b do
 
   it "raises on invalid " do
     expect_raises ArgumentError do
-      Cox::Blake2b.new key: Bytes.new(128)
+      Cox::Digest::Blake2b.new key: Bytes.new(128)
     end
 
     expect_raises ArgumentError do
-      Cox::Blake2b.new salt: Bytes.new(1)
+      Cox::Digest::Blake2b.new salt: Bytes.new(1)
     end
 
     expect_raises ArgumentError do
-      Cox::Blake2b.new salt: Bytes.new(128)
+      Cox::Digest::Blake2b.new salt: Bytes.new(128)
     end
 
     expect_raises ArgumentError do
-      Cox::Blake2b.new personal: Bytes.new(128)
+      Cox::Digest::Blake2b.new personal: Bytes.new(128)
     end
   end
 end
diff --git a/src/cox/blake2b.cr b/src/cox/digest/blake2b.cr
similarity index 99%
rename from src/cox/blake2b.cr
rename to src/cox/digest/blake2b.cr
index 3aa5bab..61af3c4 100644
--- a/src/cox/blake2b.cr
+++ b/src/cox/digest/blake2b.cr
@@ -1,6 +1,6 @@
 require "openssl/digest/digest_base"
 
-module Cox
+module Cox::Digest
   class Blake2b
     # provides copying digest/hexdigest methods
     include OpenSSL::DigestBase