diff --git a/generate_sha1_from_commit.sh b/generate_sha1_from_commit.sh
new file mode 100644
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+++ b/generate_sha1_from_commit.sh
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+#!/bin/bash
+#
+#==============================================================================
+# SYNOPSIS
+#    generate_sha1_from_commit.sh args ...
+#
+# DESCRIPTION
+#    The script generates and updates proprietary-files.txt sha1sum from a
+#    vendor commit id.
+#
+# EXAMPLES
+#    ./generate_sha1_from_commit.sh 1a2b3c4d
+#
+# AUTHOR
+#    Chenyang Zhong
+#
+# HISTORY
+#    2020/06/19 : Script creation
+#    2020/09/29 : Updated script to handle added and deleted blobs
+#    2020/11/14 : Adapted for polaris
+#
+#==============================================================================
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+set -e
+
+MY_DIR="${PWD}"
+
+VENDOR_DIR="${MY_DIR}"/../../../vendor/oneplus
+DEVICE=sm7250-common
+DIR_PREFIX="proprietary/"
+
+cd "${VENDOR_DIR}/${DEVICE}"
+
+# get commit id from input
+if [ "${#}" -eq 1 ]; 
+then
+    COMMIT="${1}"
+else
+    echo >&2 "Please specify a vendor commit id."
+    exit 1
+fi 
+
+# display commit id and title
+echo "$(git show -s --format='%h %s' ${COMMIT})"
+echo "========================================================"
+
+# iterate through changed files in the commit
+git diff-tree --no-commit-id --name-status -r ${COMMIT} | while read line ;
+do
+    # separate status and file name
+    read -ra arr_line <<< "${line}"
+    status=${arr_line[0]}
+    file=${arr_line[1]}
+
+    # remove directory prefix from filename
+    file_stripped=${file#"${DIR_PREFIX}"}
+
+    # blob status is deleted
+    if [[ "$status" == "D" ]]; then
+        echo "deleting ${file_stripped}"
+        sed -i "\%^${file_stripped}%d" "${MY_DIR}/proprietary-files.txt"
+        continue
+    fi
+
+    # generate sha1
+    r="$(sha1sum "$file")"
+    r_arr=($r)
+    sha1="${r_arr[0]}"
+
+    # blob is newly added
+    if [[ "$status" == "A" ]]; then
+        echo "adding ${file_stripped}"
+        echo "${file_stripped}|${sha1}" >> "${MY_DIR}/proprietary-files.txt"
+        continue
+    fi
+
+    # the rest files already exist in the list and are modified
+    # iterate through lines in proprietary-files.txt until the first
+    # non-comment match
+    for line in $(grep "$file_stripped" "${MY_DIR}/proprietary-files.txt")
+    do
+        # continue if this line starts with #
+        [[ $line =~ ^#.* ]] && continue
+
+        # check if it has a sha1sum already
+        if [[ "$line" == *"|"* ]]; then
+            # remove the old sha1sum and append the new one
+            newline="${line:0:${#line}-40}${sha1}" 
+        else
+            # append the new sha1sum to it
+            newline="${line}|${sha1}"
+        fi
+
+        # display which line is getting replaced
+        echo "$line ---> $newline"
+
+        # use % as delimiter because file path contains "/"
+        sedstr="s%^$line\$%$newline%" 
+        sed -i "$sedstr" "${MY_DIR}/proprietary-files.txt"
+
+        # exit after the first replacement
+        break
+    done
+    
+done