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diff --git a/packages/renderer/src/components/errorPage/SingleCertificateDetails.tsx b/packages/renderer/src/components/errorPage/SingleCertificateDetails.tsx
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+++ b/packages/renderer/src/components/errorPage/SingleCertificateDetails.tsx
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+/*
+ * Copyright (C)  2022 Kristóf Marussy <kristof@marussy.com>
+ *
+ * This file is part of Sophie.
+ *
+ * Sophie 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, version 3.
+ *
+ * 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 <https://www.gnu.org/licenses/>.
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import AttachmentIcon from '@mui/icons-material/Attachment';
+import Link from '@mui/material/Link';
+import { styled } from '@mui/material/styles';
+import type { Certificate, CertificatePrincipal } from '@sophie/shared';
+import type { TFunction } from 'i18next';
+import { observer } from 'mobx-react-lite';
+import React, { type ReactNode } from 'react';
+import { useTranslation } from 'react-i18next';
+
+const SingleCertificateDetailsRoot = styled('table')(({ theme }) => ({
+  width: '100%',
+  borderSpacing: `${theme.spacing(2)} 0`,
+}));
+
+const Header = styled('th')({
+  textAlign: 'right',
+  whiteSpace: 'nowrap',
+  verticalAlign: 'top',
+});
+
+const SectionHeader = styled(Header)(({ theme }) => ({
+  padding: `${theme.spacing(2)} 0`,
+  fontWeight: theme.typography.fontWeightBold,
+}));
+
+const SubHeader = styled(Header)(({ theme }) => ({
+  color: theme.palette.text.secondary,
+  fontWeight: theme.typography.fontWeightMedium,
+}));
+
+const Cell = styled('td')({
+  verticalAlign: 'top',
+});
+
+function Section({ id, label }: { id: string; label: string }): JSX.Element {
+  return (
+    <tr>
+      <SectionHeader id={id} scope="colgroup">
+        {label}
+      </SectionHeader>
+      <Cell aria-hidden="true" />
+    </tr>
+  );
+}
+
+function Row({
+  id,
+  label,
+  headers,
+  children,
+}: {
+  id: string;
+  label: string;
+  headers: string;
+  children: ReactNode;
+}): JSX.Element {
+  return (
+    <tr>
+      <SubHeader id={id} scope="row">
+        {label}
+      </SubHeader>
+      <Cell headers={`${headers} ${id}`}>{children}</Cell>
+    </tr>
+  );
+}
+
+function OptionalRow({
+  id,
+  label,
+  value,
+  headers,
+}: {
+  id: string;
+  label: string;
+  value: string;
+  headers: string;
+}): JSX.Element | null {
+  if (value === '') {
+    // eslint-disable-next-line unicorn/no-null -- React requires `null` to skip rendering.
+    return null;
+  }
+
+  return (
+    <Row id={id} label={label} headers={headers}>
+      {value}
+    </Row>
+  );
+}
+
+function DateTimeRow({
+  id,
+  label,
+  value,
+  locales,
+  headers,
+}: {
+  id: string;
+  label: string;
+  value: number;
+  locales: readonly string[];
+  headers: string;
+}): JSX.Element {
+  // Electron provides `validStart` and `validExpiry` in seconds,
+  // but `Date` expects milliseconds.
+  const date = new Date(value * 1000);
+  const dateStr = new Intl.DateTimeFormat([...locales], {
+    dateStyle: 'long',
+    timeStyle: 'long',
+  }).format(date);
+
+  return (
+    <Row id={id} label={label} headers={headers}>
+      {dateStr}
+    </Row>
+  );
+}
+
+function Principal({
+  id,
+  label,
+  principal: {
+    country,
+    state,
+    locality,
+    organizations,
+    organizationUnits,
+    commonName,
+  },
+  t,
+  onIssuerClick,
+}: {
+  id: string;
+  label: string;
+  principal: CertificatePrincipal;
+  t: TFunction;
+  onIssuerClick?: (() => void) | undefined;
+}): JSX.Element {
+  return (
+    <>
+      <Section id={id} label={label} />
+      <OptionalRow
+        id={`${id}-country`}
+        label={t<string>('country')}
+        value={country}
+        headers={id}
+      />
+      <OptionalRow
+        id={`${id}-state`}
+        label={t<string>('state')}
+        value={state}
+        headers={id}
+      />
+      <OptionalRow
+        id={`${id}-locality`}
+        label={t<string>('locality')}
+        value={locality}
+        headers={id}
+      />
+      {/*
+        eslint-disable react/no-array-index-key --
+        These entries can freely contain repetitions, so we can only tell them apart by index.
+      */}
+      {organizations.map((value, i) => (
+        <OptionalRow
+          key={i}
+          id={`${id}-organization-${i}`}
+          label={t<string>('organization')}
+          value={value}
+          headers={id}
+        />
+      ))}
+      {organizationUnits.map((value, i) => (
+        <OptionalRow
+          key={i}
+          id={`${id}-organizationUnit-${i}`}
+          label={t<string>('organizationUnit')}
+          value={value}
+          headers={id}
+        />
+      ))}
+      {/* eslint-enable react/no-array-index-key */}
+      {commonName !== '' && (
+        <Row
+          id={`${id}-commonName`}
+          label={t<string>('commonName')}
+          headers={id}
+        >
+          {onIssuerClick === undefined ? (
+            commonName
+          ) : (
+            // eslint-disable-next-line jsx-a11y/anchor-is-valid -- This is a `button`.
+            <Link
+              component="button"
+              variant="body1"
+              onClick={onIssuerClick}
+              sx={{ verticalAlign: 'baseline' }}
+            >
+              {commonName}
+            </Link>
+          )}
+        </Row>
+      )}
+    </>
+  );
+}
+
+Principal.defaultProps = {
+  onIssuerClick: undefined,
+};
+
+function parseFingerprint(fingerprint: string): {
+  algorithm: string | undefined;
+  formattedValue: string;
+} {
+  const separatorIndex = fingerprint.indexOf('/');
+  if (separatorIndex <= 0) {
+    return {
+      algorithm: undefined,
+      formattedValue: fingerprint,
+    };
+  }
+  return {
+    algorithm: fingerprint.slice(0, separatorIndex).toUpperCase(),
+    formattedValue: fingerprint.slice(separatorIndex + 1),
+  };
+}
+
+function Fingerprint({
+  id,
+  label,
+  fallbackAlgorithmLabel,
+  value,
+}: {
+  id: string;
+  label: string;
+  fallbackAlgorithmLabel: string;
+  value: string;
+}) {
+  const { algorithm, formattedValue } = parseFingerprint(value);
+  return (
+    <>
+      <Section id={id} label={label} />
+      <OptionalRow
+        id={`${id}-fingerprint`}
+        label={algorithm ?? fallbackAlgorithmLabel}
+        headers={id}
+        value={formattedValue}
+      />
+    </>
+  );
+}
+
+function SingleCertificateDetails({
+  detailsId,
+  certificate: {
+    subject,
+    issuer,
+    validStart,
+    validExpiry,
+    fingerprint,
+    serialNumber,
+  },
+  onIssuerClick,
+  onDownloadClick,
+}: {
+  detailsId: string;
+  certificate: Certificate;
+  onIssuerClick?: (() => void) | undefined;
+  onDownloadClick: () => void;
+}): JSX.Element {
+  const {
+    t,
+    i18n: { languages },
+  } = useTranslation(undefined, {
+    keyPrefix: 'error.certificateError.details',
+  });
+
+  const id = `${detailsId}-${fingerprint}-certificate`;
+
+  return (
+    <SingleCertificateDetailsRoot>
+      <tbody>
+        <Principal
+          id={`${id}-subject`}
+          label={t<string>('subject')}
+          principal={subject}
+          t={t}
+        />
+        <Principal
+          id={`${id}-issuer`}
+          label={t<string>('issuer')}
+          principal={issuer}
+          t={t}
+          onIssuerClick={onIssuerClick}
+        />
+        <Section id={`${id}-validity`} label={t<string>('validity')} />
+        <DateTimeRow
+          id={`${id}-validity-validStart`}
+          label={t<string>('validStart')}
+          value={validStart}
+          locales={languages}
+          headers={`${id}-validity`}
+        />
+        <DateTimeRow
+          id={`${id}-validity-validExpiry`}
+          label={t<string>('validExpiry')}
+          value={validExpiry}
+          locales={languages}
+          headers={`${id}-validity`}
+        />
+        <Section
+          id={`${id}-miscellaneous`}
+          label={t<string>('miscellaneous')}
+        />
+        <OptionalRow
+          id={`${id}-miscellaneous-serialNumber`}
+          label={t<string>('serialNumber')}
+          value={serialNumber}
+          headers={`${id}-miscellaneous`}
+        />
+        <Row
+          id={`${id}-miscellaneous-download`}
+          label={t<string>('download')}
+          headers={`${id}-miscellaneous`}
+        >
+          {/* eslint-disable-next-line jsx-a11y/anchor-is-valid -- This is a `button`. */}
+          <Link
+            component="button"
+            variant="body1"
+            onClick={onDownloadClick}
+            sx={{ verticalAlign: 'baseline' }}
+          >
+            <AttachmentIcon fontSize="inherit" /> {t('downloadPEM')}
+          </Link>
+        </Row>
+        <Fingerprint
+          id={`${id}-fingerprint`}
+          label={t<string>('fingerprint')}
+          fallbackAlgorithmLabel={t<string>('fingerprintUnknown')}
+          value={fingerprint}
+        />
+      </tbody>
+    </SingleCertificateDetailsRoot>
+  );
+}
+
+SingleCertificateDetails.defaultProps = {
+  onIssuerClick: undefined,
+};
+
+export default observer(SingleCertificateDetails);