69 lines
1.6 KiB
Bash
Executable File
69 lines
1.6 KiB
Bash
Executable File
#!/system/bin/sh
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#
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# SPDX-FileCopyrightText: 2025 The LineageOS Project
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# SPDX-License-Identifier: Apache-2.0
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#
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FRP_BLOCK=$(getprop ro.frp.pst)
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if [[ -z "${FRP_BLOCK}" ]]; then
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echo "FRP prop not set"
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exit -1
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fi
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FRP_BLOCK_SIZE=$(blockdev --getsize64 "${FRP_BLOCK}")
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if [[ "${FRP_BLOCK_SIZE}" -le 0 ]]; then
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echo "FRP block size <= 0"
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exit -1
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fi
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# Calculate offsets
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DIGEST_SIZE=32
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DIGEST_OFFSET=0
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FRP_OEM_UNLOCK_SIZE=1
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FRP_OEM_UNLOCK_OFFSET=$((${FRP_BLOCK_SIZE} - 1))
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FRP_CREDENTIAL_RESERVED_SIZE=1000
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FRP_CREDENTIAL_RESERVED_OFFSET=$((${FRP_OEM_UNLOCK_OFFSET} - ${FRP_CREDENTIAL_RESERVED_SIZE}))
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TEST_MODE_RESERVED_SIZE=10000
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TEST_MODE_RESERVED_OFFSET=$((${FRP_CREDENTIAL_RESERVED_OFFSET} - ${TEST_MODE_RESERVED_SIZE}))
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FRP_SECRET_SIZE=32
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FRP_SECRET_OFFSET=$((${TEST_MODE_RESERVED_OFFSET} - ${FRP_SECRET_SIZE}))
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FRP_SECRET_MAGIC_SIZE=8
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FRP_SECRET_MAGIC_OFFSET=$((${FRP_SECRET_OFFSET} - ${FRP_SECRET_MAGIC_SIZE}))
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# Clear digest
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dd if=/dev/zero of="${FRP_BLOCK}" \
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seek="${DIGEST_OFFSET}" \
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count="${DIGEST_SIZE}" \
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bs=1
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# Clear credential storage
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dd if=/dev/zero of="${FRP_BLOCK}" \
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seek="${FRP_CREDENTIAL_RESERVED_OFFSET}" \
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count="${FRP_CREDENTIAL_RESERVED_SIZE}" \
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bs=1
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# Clear FRP secret
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dd if=/dev/zero of="${FRP_BLOCK}" \
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seek="${FRP_SECRET_OFFSET}" \
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count="${FRP_SECRET_SIZE}" \
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bs=1
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# Write default FRP secret magic
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printf "\xDA\xC2\xFC\xCD\xB9\x1B\x09\x88" | dd of="${FRP_BLOCK}" \
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seek="${FRP_SECRET_MAGIC_OFFSET}" \
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count="${FRP_SECRET_MAGIC_SIZE}" \
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bs=1
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# Write digest
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sha256sum -b "${FRP_BLOCK}" | xxd -r -p | dd of="${FRP_BLOCK}" \
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seek="${DIGEST_OFFSET}" \
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count="${DIGEST_SIZE}" \
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bs=1
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