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diff --git a/src/views/ChecksumTab21.vue b/src/views/ChecksumTab21.vue
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+<!--
+  - @copyright Copyright (c) 2021 Patrick Herzberg <patrick@westberliner.net>
+  -
+  - @author Patrick Herzberg <patrick@westberliner.net>
+  -
+  - @license GNU AGPL version 3 or any later version
+  -
+  - This program is free software: you can redistribute it and/or modify
+  - it under the terms of the GNU Affero General Public License as
+  - published by the Free Software Foundation, either version 3 of the
+  - License, or (at your option) any later version.
+  -
+  - 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 Affero General Public License for more details.
+  -
+  - You should have received a copy of the GNU Affero General Public License
+  - along with this program. If not, see <http://www.gnu.org/licenses/>.
+  -
+  -->
+
+<template>
+	<div>
+		<!-- checksum content -->
+		<Multiselect
+			v-model="algorithm"
+			:options="algorithms"
+			track-by="id"
+			label="label"
+			@change="onAlgorithmChangeHandler" />
+		<br>
+		<br>
+		<p :class="{ 'icon-loading': loading }" class="checksum-hash-result">
+			<span v-if="!loading && algorithm.id !== ''"><strong>{{ algorithm.label }}:</strong>{{ hash }}</span>
+		</p>
+	</div>
+</template>
+
+<script>
+import { generateUrl } from '@nextcloud/router'
+import axios from '@nextcloud/axios'
+import Multiselect from '@nextcloud/vue/dist/Components/Multiselect'
+
+const algorithms = [
+	{ id: '', label: t('checksum', 'Choose Algorithm') },
+	{ id: 'md5', label: 'MD5' },
+	{ id: 'sha1', label: 'SHA1' },
+	{ id: 'sha256', label: 'SHA256' },
+	{ id: 'sha384', label: 'SHA384' },
+	{ id: 'sha512', label: 'SHA1' },
+	{ id: 'crc32', label: 'CRC32' },
+	{ id: 'crc32b', label: 'CRC32b' },
+]
+
+export default {
+	name: 'ChecksumTab21',
+
+	components: {
+		Multiselect,
+	},
+
+	mixins: [],
+
+	data() {
+		return {
+			loading: false,
+			algorithm: algorithms[0],
+			algorithms,
+			hash: '',
+		}
+	},
+
+	computed: {
+		/**
+		 * Returns the current active tab.
+		 * Needed because AppSidebarTab also uses $parent.activeTab.
+		 *
+		 * @returns {string}
+		 */
+		activeTab() {
+			return this.$parent.activeTab
+		},
+
+	},
+
+	methods: {
+		/**
+     * Update current fileInfo and fetch new data.
+     * @param {Object} fileInfo the current file FileInfo.
+     */
+		update(fileInfo) {
+			this.fileInfo = fileInfo
+		},
+
+		/**
+		 * Handles selection change event by triggering hash ajax call.
+		 *
+		 * @param {Object} algorithm - The selected algorithm object.
+		 * @param {string} algorithm.id - The selected algorithm id.
+		 * @param {string} algorithm.label - The selected algorithm label.
+		 */
+		onAlgorithmChangeHandler(algorithm) {
+			this.hash = ''
+			if (algorithm.id.length) {
+				this.loading = true
+				this.getChecksum(algorithm.id)
+			}
+		},
+
+		/**
+		 * @param {string} algorithmType - The hasg algorithm type.
+		 */
+		getChecksum(algorithmType) {
+			const url = generateUrl('/apps/checksum/check')
+			const params = { source: this.fileInfo.path + this.fileInfo.name, type: algorithmType }
+			axios.get(url, { params }).then(response => {
+				this.loading = false
+				this.hash = response.data.msg
+			}).catch(err => {
+				console.error(err)
+			})
+		},
+
+		/**
+		 * Reset the current view to its default state
+		 */
+		resetState() {
+			this.loading = false
+			this.algorithm = ''
+		},
+	},
+}
+</script>
+
+<style lang="scss" scoped>
+	.checksum-hash-result {
+		text-align: center;
+		word-wrap: break-word;
+	}
+</style>