expo-crypto

import React, {useEffect, useState} from 'react';
import {StyleSheet, View, Text} from 'react-native';
import * as Crypto from '@amazon-devices/expo-crypto';

export const App = () => {
  const [digest, setDigest] = useState<string>();

  useEffect(() => {
    (async () => {
      const digestStr = await Crypto.digestStringAsync(
        Crypto.CryptoDigestAlgorithm.SHA256,
        'GitHubのスターはすごい🌟',
      );
      setDigest(digestStr);
    })();
  }, []);

  return (
    <View style={styles.container}>
      <Text style={styles.text}>Crypto Module Example {digest}</Text>
    </View>
  );
};

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: 'white',
    justifyContent: 'center',
    alignItems: 'center',
  },
  text: {
    fontSize: 30,
    color: 'black',
  },
});