| #!/bin/sh |
| # Copyright (c) 2016 MediaTek Inc. |
| # |
| # This program is free software; you can redistribute it and/or modify |
| # it under the terms of the GNU General Public License version 2 as |
| # published by the Free Software Foundation. |
| # |
| # This program is distributed in the hope that it will be useful, |
| # but WITHOUT ANY WARRANTY; without even the implied warranty of |
| # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| # GNU General Public License for more details. |
| |
| VPDDATA="/var/cache/vpd/full-v2.txt" |
| HDCP_NODE="/sys$1/hdcp_key" |
| |
| log() { |
| logger -t "hdcp-pass-key" -s "$@" |
| } |
| |
| # check if the hdcp node exists or not |
| if [ ! -e "${HDCP_NODE}" ]; then |
| log "hdcp node: \"${HDCP_NODE}\" doesn't exist" |
| exit 1 |
| fi |
| |
| # Grab the hdcp_key from VPD. |
| # Below example is the hdcp_key data format in VPD. This is |
| # just an example, so the real key length will be longer. |
| # "hdcp_key"="balabalabalabalabalabalabalabala" |
| KEYSET=$(sed -n 's/"hdcp_key"="\(.*\)"/\1/p' "${VPDDATA}") |
| |
| # check if KEYSET was found |
| if [ -n "${KEYSET}" ]; then |
| log "read vpd key ok" |
| else |
| log "read vpd key fail" |
| exit 1 |
| fi |
| |
| # The 288-byte HDCP key set (40 7-byte keys, plus 8-bytes KSV) is passed |
| # to the Mediatek HDMI driver as a 664-byte encrypted blob. |
| # The VPD key "hdcp_key" stores this blob as a 886-byte base64 encoded string. |
| echo "${KEYSET}" | base64 -d | hexdump -n 664 -ve '/1 "%02x"' > "${HDCP_NODE}" |
