I have some problem with my android application. I am trying to an app related with RSA encryption/decryption.this is my problem:
I can encrypt short sentences clearly, but when i try to decrypt this message to orginal text I give an error ("too much data for RSA block"). And also if I want to encrypt a long sentences i have same error.I had some search for this problem, and found some solution in this sites:
Site 1
Site 2
Site 3
But i dont understand anything, these solutions are so complicated.How can i fixed this problem, Can anyone give me a more simple solution? Thank you.
ED?T:
These are the code blocks that i use for this project.
public String RSAEncrypt(String plain) throws NoSuchAlgorithmException, NoSuchPaddingException,InvalidKeyException, IllegalBlockSizeException, BadPaddingException, InvalidKeySpecException, UnsupportedEncodingException {
publicKey = getPublicKey();
Cipher cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.ENCRYPT_MODE, publicKey);
byte[] cipherData = cipher.doFinal(plain.getBytes());
return Base64.encodeToString(cipherData, Base64.DEFAULT);
}
public String RSADecrypt(byte[] encryptedBytes) throws NoSuchAlgorithmException, NoSuchPaddingException,InvalidKeyException, IllegalBlockSizeException, BadPaddingException, InvalidKeySpecException, UnsupportedEncodingException {
privateKey = getPrivateKey();
Cipher cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.DECRYPT_MODE, privateKey);
byte[] cipherData = cipher.doFinal(encryptedBytes);
return Base64.encodeToString(cipherData, Base64.DEFAULT);
}
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