can anyone give me an example for using GCM and/or CCM modes with AES in BouncyCastle?
My code is this:
SecretKeySpec key = new SecretKeySpec(keyBytes, "AES");
IvParameterSpec ivSpec = new IvParameterSpec(ivBytes);
Cipher cipher = Cipher.getInstance("AES/AEAD/PKCS5Padding", "BC");
byte[] block = new byte[1048576];
int i;
long st,et;
cipher.init(Cipher.ENCRYPT_MODE, key, ivSpec);
BufferedInputStream bIn=new BufferedInputStream(new ProgressMonitorInputStream(null,"Encrypting ...",new FileInputStream("input")));
CipherInputStream cIn = new CipherInputStream(bIn, cipher);
BufferedOutputStream bOut=new BufferedOutputStream(new FileOutputStream("output.enc"));
int ch;
while ((i = cIn.read(block)) != -1) {
bOut.write(block, 0, i);
}
cIn.close();
bOut.close();
Thread.sleep(5000);
cipher.init(Cipher.DECRYPT_MODE, key, ivSpec);
BufferedInputStream fis=new BufferedInputStream(new ProgressMonitorInputStream(null,"Decrypting ...",new FileInputStream("output.enc")));
//FileInputStream fis=new FileInputStream("output.enc");
//FileOutputStream ro=new FileOutputStream("regen.plain");
BufferedOutputStream ro=new BufferedOutputStream(new FileOutputStream("regen.plain"));
CipherInputStream dcIn = new CipherInputStream(fis, cipher);
while ((i = dcIn.read(block)) != -1) {
ro.write(block, 0, i);
}
dcIn.close();
ro.close();
but it throws this exception when decrypting in GCM mode (line 70 is bOut.write(block, 0, i);):
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException
at java.lang.System.arraycopy(Native Method)
at org.bouncycastle.crypto.modes.CCMBlockCipher.processPacket(Unknown Source)
at org.bouncycastle.crypto.modes.CCMBlockCipher.doFinal(Unknown Source)
at org.bouncycastle.jcajce.provider.symmetric.util.BaseBlockCipher$AEADGenericBlockCipher.doFinal(Unknown Source)
at org.bouncycastle.jcajce.provider.symmetric.util.BaseBlockCipher.engineDoFinal(Unknown Source)
at javax.crypto.Cipher.doFinal(DashoA13*..)
at javax.crypto.CipherInputStream.a(DashoA13*..)
at javax.crypto.CipherInputStream.read(DashoA13*..)
at javax.crypto.CipherInputStream.read(DashoA13*..)
at enctest.Main.main(Main.java:70)
And this Exception when encrypting in CCM mode (line 70 is bOut.write(block, 0, i);):
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException
at java.lang.System.arraycopy(Native Method)
at org.bouncycastle.crypto.modes.CCMBlockCipher.processPacket(Unknown Source)
at org.bouncycastle.crypto.modes.CCMBlockCipher.doFinal(Unknown Source)
at org.bouncycastle.jcajce.provider.symmetric.util.BaseBlockCipher$AEADGenericBlockCipher.doFinal(Unknown Source)
at org.bouncycastle.jcajce.provider.symmetric.util.BaseBlockCipher.engineDoFinal(Unknown Source)
at javax.crypto.Cipher.doFinal(DashoA13*..)
at javax.crypto.CipherInputStream.a(DashoA13*..)
at javax.crypto.CipherInputStream.read(DashoA13*..)
at javax.crypto.CipherInputStream.read(DashoA13*..)
at enctest.Main.main(Main.java:70)
