diff --git a/examples/blake2b_hash.cr b/examples/blake2b_hash.cr
new file mode 100644
index 0000000..5ecc047
--- /dev/null
+++ b/examples/blake2b_hash.cr
@@ -0,0 +1,49 @@
+require "option_parser"
+require "../src/sodium/digest/blake2b"
+require "openssl"
+
+out_size = 64
+buf_size = 8192
+digest_name = "blake2b"
+
+optp = OptionParser.new
+optp.on("--out-size=INT", "") { |arg| out_size = arg.to_i }
+optp.on("--buf-size=INT", "") { |arg| buf_size = arg.to_i }
+optp.on("--digest=NAME", "") { |arg| digest_name = arg }
+optp.parse
+
+class Digest::Null < Digest
+  def update_impl(data : Bytes) : Nil
+  end
+
+  def final_impl(data : Bytes) : Nil
+  end
+
+  def reset_impl : Nil
+  end
+
+  def digest_size : Int32
+    0
+  end
+end
+
+digest = case digest_name
+         when "blake2b"
+           Sodium::Digest::Blake2b.new out_size
+         when "null"
+           Digest::Null.new
+         else
+           # raise "foo"
+           OpenSSL::Digest.new digest_name
+         end
+
+buf = Bytes.new buf_size
+
+loop do
+  r = STDIN.read buf
+  break if r <= 0
+
+  digest.update buf[0, r]
+end
+
+puts digest.final.hexstring
diff --git a/shard.yml b/shard.yml
index 70f2431..fe51ca9 100644
--- a/shard.yml
+++ b/shard.yml
@@ -6,6 +6,8 @@ authors:
 - Didactic Drunk <1479616+didactic-drunk@users.noreply.github.com>
 crystal: ">= 0.36.0"
 targets:
+  blake2b_hash:
+    main: examples/blake2b_hash.cr
   pwhash_selector:
     main: examples/pwhash_selector.cr
 libraries:
diff --git a/src/sodium/version.cr b/src/sodium/version.cr
index e8695ad..4f66092 100644
--- a/src/sodium/version.cr
+++ b/src/sodium/version.cr
@@ -1,3 +1,3 @@
 module Sodium
-  VERSION = "1.2.1"
+  VERSION = "1.2.3"
 end