expo-crypto

@amazon-devices/expo-crypto is a universal library for crypto operations that enables you to hash data in an equivalent manner to the Node.js core crypto API.

• Installation
• Examples
• API reference
  • Methods
• Implementation details
• Supported versions
• Additional resources

Installation

1. Add the JavaScript library dependency in the package.json file.

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    dependencies: {
        ...
        "@amazon-devices/expo-crypto": "~2.0.0",
        "@amazon-devices/keplerscript-turbomodule-api": "~1.0.0",
        ...
    }
   

2. Reinstall dependencies using npm install command.

Examples

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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 stars are neat 🌟',
      );
      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',
  },
});

API reference

Check out the dedicated documentation page for info about this library, API reference and more: Official Expo documentation for expo-crypto.

Methods

Implementation details

Vega supports all cryptographic hash functions (CryptoDigestAlgorithm enum) except for MD2.

Supported versions

Additional resources

For information on additional libraries, see Supported Third-Party Libraries and Services.

Last updated: Sep 30, 2025