diff --git a/dev-ml/hkdf/Manifest b/dev-ml/hkdf/Manifest
new file mode 100644
index 0000000000..6b8b755db6
--- /dev/null
+++ b/dev-ml/hkdf/Manifest
@@ -0,0 +1 @@
+DIST hkdf-v1.0.4.tbz 11592 BLAKE2B 5c777f92ac8ad52bbe5c9e2383fa2cb705b793a3fcdedee16c37b69c6c0848b89682e168a9be56d020ab51a7d0195a379d23c23a420874c7fc6772540388c670 SHA512 d08e50857f7761572adc4d382975fde5808898c1d92d9e6e943a496cba8780ffabe1edf67844063b70d9727c0fe10b24391e001a3f65c978a5326ac82199cc88
diff --git a/dev-ml/hkdf/hkdf-1.0.4.ebuild b/dev-ml/hkdf/hkdf-1.0.4.ebuild
new file mode 100644
index 0000000000..abb7bb9ec0
--- /dev/null
+++ b/dev-ml/hkdf/hkdf-1.0.4.ebuild
@@ -0,0 +1,29 @@
+# Copyright 2020-2022 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+inherit dune
+
+MY_P="${PN}-v${PV}"
+
+DESCRIPTION="HMAC-based Extract-and-Expand Key Derivation Function (RFC 5869)"
+HOMEPAGE="https://github.com/hannesm/ocaml-hkdf"
+SRC_URI="https://github.com/hannesm/ocaml-${PN}/releases/download/v${PV}/${MY_P}.tbz"
+S="${WORKDIR}/${MY_P}"
+
+LICENSE="BSD-2"
+SLOT="0/${PV}"
+KEYWORDS="~amd64"
+IUSE="ocamlopt test"
+
+RDEPEND="
+	dev-ml/cstruct
+	dev-ml/mirage-crypto
+"
+DEPEND="
+	${RDEPEND}
+	test? ( dev-ml/alcotest )
+"
+
+RESTRICT="!test? ( test )"
diff --git a/dev-ml/hkdf/metadata.xml b/dev-ml/hkdf/metadata.xml
new file mode 100644
index 0000000000..78153fde6a
--- /dev/null
+++ b/dev-ml/hkdf/metadata.xml
@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
+<pkgmetadata>
+    <maintainer type="person">
+        <description>co-maintainers welcome</description>
+        <email>lssndrbarbieri@gmail.com</email>
+        <name>Alessandro Barbieri</name>
+    </maintainer>
+    <upstream>
+        <remote-id type="github">hannesm/ocaml-hkdf</remote-id>
+    </upstream>
+</pkgmetadata>