Review

Uses static key.

• missing/condition/value_or_state

SaavnFileRunner.java

decryptPlay(String)

class SaavnFileRunner {
    private String decryptPlay(final String str) throws Exception {
        final Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
        cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(SECRET_KEY, "DES"));
        return new String(cipher.doFinal(Base64.decodeBase64(str)), "UTF-8");
    }

}

public class AES {
	public void encrypt(String strDataToEncrypt) {
		try {
			KeyGenerator keyGen = KeyGenerator.getInstance("AES");
			keyGen.init(128);
			SecretKey secretKey = keyGen.generateKey();
			final int AES_KEYLENGTH = 128;
			byte[] iv = new byte[AES_KEYLENGTH / 8];
			SecureRandom prng = new SecureRandom();
			prng.nextBytes(iv);
			Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding");
			cipher.init(Cipher.ENCRYPT_MODE, secretKey, 
					new IvParameterSpec(iv));
			
			byte[] byteDataToEncrypt = strDataToEncrypt.getBytes();
			byte[] byteCipherText = cipher.doFinal(byteDataToEncrypt);
		}
		catch (NoSuchAlgorithmException noSuchAlgo) {
		}
		catch (NoSuchPaddingException noSuchPad) {
		}
		catch (InvalidKeyException invalidKey) {
		}
		catch (BadPaddingException badPadding) {
		}
		catch (IllegalBlockSizeException illegalBlockSize) {
		}
		catch (InvalidAlgorithmParameterException invalidParam) {
		}
	}
	public void decrypt(byte[] cipherText, SecretKey secretKey, byte[] iv){
		try {
			Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding");
			cipher.init(Cipher.DECRYPT_MODE, secretKey, new IvParameterSpec(iv));
			byte[] byteDecryptedText = cipher.doFinal(cipherText);
			String decryptedText = new String(byteDecryptedText);
		}
		catch (NoSuchAlgorithmException noSuchAlgo) {
		}
		catch (NoSuchPaddingException noSuchPad) {
		}
		catch (InvalidKeyException invalidKey) {
		}
		catch (BadPaddingException badPadding) {
		}
		catch (IllegalBlockSizeException illegalBlockSize) {
		}
		catch (InvalidAlgorithmParameterException invalidParam) {
		}
	}
}