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Use GCM mode in AES (fixes #3324) (#3325)

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This commit is contained in:
kongleong86
2022-10-18 19:24:25 +01:00
committed by GitHub
parent 8803b7f5e7
commit f2e0126469
1 changed files with 10 additions and 5 deletions
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15
src/main/java/com/thealgorithms/ciphers/AESEncryption.java
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@ -3,6 +3,8 @@ package com.thealgorithms.ciphers;
import java.security.InvalidKeyException; import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException; import java.security.NoSuchAlgorithmException;
import javax.crypto.*; import javax.crypto.*;
import javax.crypto.spec.GCMParameterSpec;
import java.security.InvalidAlgorithmParameterException;
/** /**
* This example program shows how AES encryption and decryption can be done in * This example program shows how AES encryption and decryption can be done in
@ -13,6 +15,7 @@ import javax.crypto.*;
public class AESEncryption { public class AESEncryption {
private static final char[] HEX_ARRAY = "0123456789ABCDEF".toCharArray(); private static final char[] HEX_ARRAY = "0123456789ABCDEF".toCharArray();
private static Cipher aesCipher;
/** /**
* 1. Generate a plain text for encryption 2. Get a secret key (printed in * 1. Generate a plain text for encryption 2. Get a secret key (printed in
@ -62,7 +65,7 @@ public class AESEncryption {
public static byte[] encryptText(String plainText, SecretKey secKey) public static byte[] encryptText(String plainText, SecretKey secKey)
throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException { throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException {
// AES defaults to AES/ECB/PKCS5Padding in Java 7 // AES defaults to AES/ECB/PKCS5Padding in Java 7
Cipher aesCipher = Cipher.getInstance("AES"); aesCipher = Cipher.getInstance("AES/GCM/NoPadding");
aesCipher.init(Cipher.ENCRYPT_MODE, secKey); aesCipher.init(Cipher.ENCRYPT_MODE, secKey);
return aesCipher.doFinal(plainText.getBytes()); return aesCipher.doFinal(plainText.getBytes());
} }
@ -73,11 +76,13 @@ public class AESEncryption {
* @return plainText * @return plainText
*/ */
public static String decryptText(byte[] byteCipherText, SecretKey secKey) public static String decryptText(byte[] byteCipherText, SecretKey secKey)
throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException { throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException,
IllegalBlockSizeException, BadPaddingException, InvalidAlgorithmParameterException {
// AES defaults to AES/ECB/PKCS5Padding in Java 7 // AES defaults to AES/ECB/PKCS5Padding in Java 7
Cipher aesCipher = Cipher.getInstance("AES"); Cipher decryptionCipher = Cipher.getInstance("AES/GCM/NoPadding");
aesCipher.init(Cipher.DECRYPT_MODE, secKey); GCMParameterSpec gcmParameterSpec = new GCMParameterSpec(128, aesCipher.getIV());
byte[] bytePlainText = aesCipher.doFinal(byteCipherText); decryptionCipher.init(Cipher.DECRYPT_MODE, secKey, gcmParameterSpec);
byte[] bytePlainText = decryptionCipher.doFinal(byteCipherText);
return new String(bytePlainText); return new String(bytePlainText);
} }