Created
January 5, 2023 13:15
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End to End Encryption
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| import java.security.*; | |
| import java.security.spec.X509EncodedKeySpec; | |
| import java.util.Base64; | |
| import javax.crypto.Cipher; | |
| public class E2EE { | |
| private KeyPair keyPair; | |
| private String publicKey; | |
| private String privateKey; | |
| public E2EE() throws NoSuchAlgorithmException { | |
| KeyPairGenerator keyGen = KeyPairGenerator.getInstance("RSA"); | |
| keyGen.initialize(2048); | |
| keyPair = keyGen.generateKeyPair(); | |
| publicKey = Base64.getEncoder().encodeToString(keyPair.getPublic().getEncoded()); | |
| privateKey = Base64.getEncoder().encodeToString(keyPair.getPrivate().getEncoded()); | |
| } | |
| public String getPublicKey() { | |
| return publicKey; | |
| } | |
| public String getPrivateKey() { | |
| return privateKey; | |
| } | |
| public byte[] encrypt(String publicKey, byte[] message) throws Exception { | |
| // Decode the public key from base64 | |
| byte[] decodedPublicKey = Base64.getDecoder().decode(publicKey); | |
| PublicKey key = KeyFactory.getInstance("RSA").generatePublic(new X509EncodedKeySpec(decodedPublicKey)); | |
| Cipher cipher = Cipher.getInstance("RSA"); | |
| cipher.init(Cipher.ENCRYPT_MODE, key); | |
| return cipher.doFinal(message); | |
| } | |
| public byte[] decrypt(byte[] message) throws Exception { | |
| Cipher cipher = Cipher.getInstance("RSA"); | |
| cipher.init(Cipher.DECRYPT_MODE, keyPair.getPrivate()); | |
| return cipher.doFinal(message); | |
| } | |
| } |
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