diff --git a/README.md b/README.md
index 6f75208..ec23fb5 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,3 @@
-# zlevis
+# Zlevis
 
-A minimal fork of clevis, rewritten in POSIX shell to accommodate automatic decryption of a ZFS root pool with TPM2. 
\ No newline at end of file
+A minimal fork of [Clevis](https://github.com/latchset/clevis), rewritten in POSIX shell to accommodate automatic decryption of a ZFS root pool with TPM2. 
diff --git a/src/zlevis-encrypt b/src/zlevis-encrypt
new file mode 100644
index 0000000..639c08a
--- /dev/null
+++ b/src/zlevis-encrypt
@@ -0,0 +1,230 @@
+#!/bin/sh
+
+set -e
+
+SUMMARY="Encrypts using a TPM2.0 chip binding policy"
+auth="o"
+alg_create_key="keyedhash"
+obj_attr="fixedtpm|fixedparent|noda|adminwithpolicy"
+
+on_exit() {
+    if [ ! -d "$TMP" ] || ! rm -rf "$TMP"; then
+        echo "Delete temporary files failed!" >&2
+        echo "You need to clean up: $TMP" >&2
+        exit 1
+    fi
+}
+
+if [ "$1" = "--summary" ]; then
+    echo "$SUMMARY"
+    exit 0
+fi
+
+if [ -t 0 ]; then
+    exec >&2
+    echo
+    echo "Usage: zlevis-encrypt tpm2 CONFIG < PLAINTEXT > JWE"
+    echo
+    echo "$SUMMARY"
+    echo
+    echo "This command uses the following configuration properties:"
+    echo "  hash: <string>; Hash algorithm used in the computation of the object name (default: sha256)."
+    echo "  key: <string>; Algorithm type for the generated key (default: ecc)."
+    echo "  pcr_bank: <string>; PCR algorithm bank to use for policy (default: first supported by TPM)."
+    echo "  pcr_ids: <string>; PCR list used for policy. If not present, no policy is used."
+    echo "  pcr_digest: <string>; Binary PCR hashes encoded in base64. If not present, the hash values are looked up."
+    exit 2
+fi
+
+validate_pcrs() {
+    _tpm2_tools_v="${1}"
+    _pcr_bank="${2}"
+    _pcrs="${3}"
+    [ -z "${_pcr_bank}" ] && return 1
+    [ -z "${_pcrs}" ] && return 0
+
+    _fail=""
+    _pcrs_r=""
+    case "${_tpm2_tools_v}" in
+    3) _pcrs_r="$(tpm2_pcrlist -L "${_pcr_bank}":"${_pcrs}" | grep -v "^${_pcr_bank}")" || _fail=$?;;
+    4|5) _pcrs_r=$(tpm2_pcrread "${_pcr_bank}":"${_pcrs}" | grep -v "  ${_pcr_bank}")  || _fail=$?;;
+    *) _fail=1
+    esac
+
+    if [ -n "${_fail}" ] || [ -z "${_pcrs_r}" ]; then
+        return 1
+    fi
+    return 0
+}
+
+TPM2TOOLS_VERSION=$(tpm2_createprimary -v | awk -F'version="' '{print $2}' | awk -F'.' '{print $1}')
+
+if [ -z "$TPM2TOOLS_VERSION" ] || [ $TPM2TOOLS_VERSION -lt 3 ] || [ $TPM2TOOLS_VERSION -gt 5 ]; then
+    echo "The tpm2 pin requires a tpm2-tools version between 3 and 5"
+    exit 1
+fi
+
+if [ -z "$TPM2TOOLS_TCTI" ]; then
+    export TPM2TOOLS_TCTI_NAME=device
+    export TPM2TOOLS_DEVICE_FILE=
+    for dev in /dev/tpmrm?; do
+        [ -e "$dev" ] || continue
+        TPM2TOOLS_DEVICE_FILE="$dev"
+        break
+    done
+
+    export TPM2TOOLS_TCTI="$TPM2TOOLS_TCTI_NAME:$TPM2TOOLS_DEVICE_FILE"
+
+    if [ -z "$TPM2TOOLS_DEVICE_FILE" ]; then
+        echo "A TPM2 device with the in-kernel resource manager is needed!" >&2
+        exit 1
+    fi
+
+    if [ ! -r "$TPM2TOOLS_DEVICE_FILE" ] || [ ! -w "$TPM2TOOLS_DEVICE_FILE" ]; then
+        echo "The $TPM2TOOLS_DEVICE_FILE device must be readable and writable!" >&2
+        exit 1
+    fi
+fi
+
+if ! cfg="$(jose fmt -j "$1" -Oo- 2>/dev/null)"; then
+    echo "Configuration is malformed!" >&2
+    exit 1
+fi
+
+mkdir -p "${TMPDIR:-/tmp}"
+if ! TMP="$(mktemp -d)"; then
+    echo "Creating a temporary dir for TPM files failed!" >&2
+    exit 1
+fi
+
+echo $cfg > "$TMP"/cfg
+hash="$(jose fmt -j- -Og hash -u- < "$TMP"/cfg)" || hash="sha256"
+key="$(jose fmt -j- -Og key -u- < "$TMP"/cfg)" || key="ecc"
+
+pcr_bank="$(jose fmt -j- -Og pcr_bank -u- < "$TMP"/cfg)" || {
+    if ! pcr_bank=$(tpm2_getcap pcrs |
+            awk '/^[[:space:]]*-[[:space:]]*([^:]+):[[:space:]]*\[[[:space:]]*[^][:space:]]/ \
+                     {found=1; split($0, m, /[-:[:space:]]+/); print m[2]; exit}
+                 END {exit !found}'); then
+        echo "Unable to find non-empty PCR algorithm bank, please check output of tpm2_getcap pcrs" >&2
+        exit 1
+    fi
+}
+
+pcr_cfg=$(tr -d '[:space:]' < "$TMP"/cfg)
+echo $pcr_cfg > "$TMP"/pcr_cfg
+
+if jose fmt -j- -Og pcr_ids 2>/dev/null < "$TMP"/pcr_cfg && ! pcr_ids="$(jose fmt -j- -Og pcr_ids -u- 2>/dev/null < "$TMP"/pcr_cfg)"; then
+
+    if jose fmt -j- -Og pcr_ids -A 2>/dev/null < "$TMP"/pcr_cfg; then
+        pcr_ids=
+        for pcr in $(jose fmt -j- -Og pcr_ids -Af- < "$TMP"/pcr_cfg | tr -d '"'); do
+            pcr_ids=$(printf '%s,%s' "${pcr_ids}" "${pcr}")
+        done
+         pcr_ids=${pcr_ids#,}
+    else
+        echo "Parsing the requested policy failed!" >&2
+        exit 1
+    fi
+fi
+
+if ! validate_pcrs "${TPM2TOOLS_VERSION}" "${pcr_bank}" "${pcr_ids}"; then
+    echo "Unable to validate combination of PCR bank '${pcr_bank}' and PCR IDs '${pcr_ids}'." >&2
+    exit 1
+fi
+
+pcr_digest="$(jose fmt -j- -Og pcr_digest -u- < "$TMP"/cfg)" || true
+echo $pcr_digest > "$TMP"/pcr_digest
+
+if ! jwk="$(jose jwk gen -i '{"alg":"A256GCM"}')"; then
+    echo "Generating a jwk failed!" >&2
+    exit 1
+fi
+echo $jwk > "$TMP"/jwk
+
+trap 'on_exit' EXIT
+
+case "$TPM2TOOLS_VERSION" in
+    3) tpm2_createprimary -Q -H "$auth" -g "$hash" -G "$key" -C "$TMP"/primary.context || fail=$?;;
+    4|5) tpm2_createprimary -Q -C "$auth" -g "$hash" -G "$key" -c "$TMP"/primary.context || fail=$?;;
+    *) fail=1;;
+esac
+if [ -n "$fail" ]; then
+    echo "Creating TPM2 primary key failed!" >&2
+    exit 1
+fi
+tpm2_flushcontext -t
+
+policy_options=""
+if [ -n "$pcr_ids" ]; then
+    if [ -z "$pcr_digest" ]; then
+        case "$TPM2TOOLS_VERSION" in
+            3) tpm2_pcrlist -Q -L "$pcr_bank":"$pcr_ids" -o "$TMP"/pcr.digest || fail=$?;;
+            4|5) tpm2_pcrread -Q "$pcr_bank":"$pcr_ids" -o "$TMP"/pcr.digest || fail=$?;;
+            *) fail=1;;
+        esac
+        if [ -n "$fail" ]; then
+            echo "Creating PCR hashes file failed!" >&2
+            exit 1
+        fi
+        tpm2_flushcontext -t
+    else
+        if ! jose b64 dec -i- -O "$TMP"/pcr.digest < "$TMP"/pcr_digest; then
+            echo "Error decoding PCR digest!" >&2
+            exit 1
+        fi
+    fi
+
+    case "$TPM2TOOLS_VERSION" in
+        3) tpm2_createpolicy -Q -g "$hash" -P -L "$pcr_bank":"$pcr_ids" -F "$TMP"/pcr.digest -f "$TMP"/pcr.policy || fail=$?;;
+        4|5) tpm2_createpolicy -Q -g "$hash" --policy-pcr -l "$pcr_bank":"$pcr_ids" -f "$TMP"/pcr.digest -L "$TMP"/pcr.policy || fail=$?;;
+        *) fail=1;;
+    esac
+    if [ -n "$fail" ]; then
+        echo "create policy fail, please check the environment or parameters!"
+        exit 1
+    fi
+    tpm2_flushcontext -t
+    tpm2_flushcontext -l
+
+    policy_options="$TMP/pcr.policy"
+else
+    obj_attr="$obj_attr|userwithauth"
+fi
+
+case "$TPM2TOOLS_VERSION" in
+    3) tpm2_create -Q -g "$hash" -G "$alg_create_key" -c "$TMP"/primary.context -u "$TMP"/jwk.pub -r "$TMP"/jwk.priv -A "$obj_attr" -L "$policy_options" -I- < "$TMP"/jwk || fail=$?;;
+    4|5) tpm2_create -Q -g "$hash" -C "$TMP"/primary.context -u "$TMP"/jwk.pub -r "$TMP"/jwk.priv -a "$obj_attr" -L "$policy_options" -i- < "$TMP"/jwk || fail=$?;;
+    *) fail=1;;
+esac
+if [ -n "$fail" ]; then
+    echo "Creating TPM2 object for jwk failed!" >&2
+    exit 1
+fi
+tpm2_flushcontext -t
+
+if ! jwk_pub="$(jose b64 enc -I "$TMP"/jwk.pub)"; then
+    echo "Encoding jwk.pub in Base64 failed!" >&2
+    exit 1
+fi
+
+if ! jwk_priv="$(jose b64 enc -I "$TMP"/jwk.priv)"; then
+    echo "Encoding jwk.priv in Base64 failed!" >&2
+    exit 1
+fi
+
+jwe='{"protected":{"clevis":{"pin":"tpm2","tpm2":{}}}}'
+jwe="$(jose fmt -j "$jwe" -g protected -g clevis -g tpm2 -q "$hash" -s hash -UUUUo-)"
+jwe="$(jose fmt -j "$jwe" -g protected -g clevis -g tpm2 -q "$key" -s key -UUUUo-)"
+
+if [ -n "$pcr_ids" ]; then
+    jwe="$(jose fmt -j "$jwe" -g protected -g clevis -g tpm2 -q "$pcr_bank" -s pcr_bank -UUUUo-)"
+    jwe="$(jose fmt -j "$jwe" -g protected -g clevis -g tpm2 -q "$pcr_ids" -s pcr_ids -UUUUo-)"
+fi
+
+jwe="$(jose fmt -j "$jwe" -g protected -g clevis -g tpm2 -q "$jwk_pub" -s jwk_pub -UUUUo-)"
+jwe="$(jose fmt -j "$jwe" -g protected -g clevis -g tpm2 -q "$jwk_priv" -s jwk_priv -UUUUo-)"
+
+[ -d "${TMP}" ] && rm -rf "${TMP}"
+
+exec jose jwe enc -i- -k- -I- -c < <(echo -n "$jwe$jwk"; /bin/cat)
\ No newline at end of file