I have a ColdFusion method for the decryption of a string: PFN123
. It uses the AES algorithm, HEX encoding and has a length of 128 bits. The output is:
32952063062A232355AABB63E129EA9F
I have written equivalent java code for AES encryption and decryption. However it produces a different result:
07e342ad4b59b276cbb6418248aaf886.
I don't understand why the results are different for same algorithm and encoding scheme. Can anyone explain why? Thanks in advance.
Java Code:
import java.security.Key;
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
import org.apache.commons.codec.binary.Hex;
public class AESEncryptionDecryptionTest {
private static final String ALGORITHM = "AES";
private static final String myEncryptionKey = "OIXQUULC7khaJzzOOHRqgw==";
private static final String UNICODE_FORMAT = "UTF8";
public static String encrypt(String valueToEnc) throws Exception {
Key key = generateKey();
Cipher c = Cipher.getInstance(ALGORITHM);
c.init(Cipher.ENCRYPT_MODE, key);
byte[] encValue = c.doFinal(valueToEnc.getBytes(UNICODE_FORMAT));
String encryptedValue = new Hex().encodeHexString(encValue);
return encryptedValue;
}
public static String decrypt(String encryptedValue) throws Exception {
Key key = generateKey();
Cipher c = Cipher.getInstance(ALGORITHM);
c.init(Cipher.DECRYPT_MODE, key);
byte[] decordedValue = new Hex().decode(encryptedValue.getBytes());
byte[] decValue = c.doFinal(decordedValue);//////////LINE 50
String decryptedValue = new String(decValue);
return decryptedValue;
}
private static Key generateKey() throws Exception {
byte[] keyAsBytes;
keyAsBytes = myEncryptionKey.getBytes();
Key key = new SecretKeySpec(keyAsBytes, ALGORITHM);
return key;
}
public static void main(String[] args) throws Exception {
String value = "PFN123";
String valueEnc = AESEncryptionDecryptionTest.encrypt(value);
String valueDec = AESEncryptionDecryptionTest.decrypt(valueEnc);
System.out.println("Plain Text : " + value);
System.out.println("Encrypted : " + valueEnc);
System.out.println("Decrypted : " + valueDec);
}
}
Thanks for the support. I have found my answer. ColdFusion is storing the key in its Base64 decoded bytes. So in java we have to generate the key by decoding via BASE64Decoder:
private static Key generateKey() throws Exception
{
byte[] keyValue;
keyValue = new BASE64Decoder().decodeBuffer(passKey);
Key key = new SecretKeySpec(keyValue, ALGORITHM);
return key;
}
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