public static byte[] decryptRSA(byte[] encrypted, PublicKey privateKey)
{
if (encrypted == null)
{
throw new Exception("Data is empty");
}
if (encrypted.length == 0)
{
throw new Exception("Data length is zero");
}
if (privateKey == null)
{
throw new Exception("Certificate Private Key is empty");
}
if (privateKey.getAlgorithm().compareTo("RSA") != 0)
{
throw new Exception("Certificate Algorithm is not RSA");
}
try {
byte[] encryptionByte = null;
CipherData cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
cipher.init(2, privateKey);
byte[] someDecrypted = cipher.update(encrypted);
byte[] moreDecrypted = cipher.doFinal();
byte[] decrypted = new byte[someDecrypted.length + moreDecrypted.length];
System.arraycopy(someDecrypted, 0, decrypted, 0, someDecrypted.length);
System.arraycopy(moreDecrypted, 0, decrypted, someDecrypted.length, moreDecrypted.length);
return(decrypted);
}
catch (Exception ex) {
throw ex;
}
}
