Method decryptRC2

java/src/cx/fbn/encrypt/EnCrypt.java:188–224

(String text, String passphrase, int keylen)

	
	// Decrypt the base64 text and return the unsecure text
	public String decryptRC2(String text, String passphrase, int keylen) {
		RC2ParameterSpec parm = new RC2ParameterSpec(keylen);
	    MessageDigest md;
		try {
			// Get a MD5 for the passphrase
			md = MessageDigest.getInstance("MD5");
			md.update(passphrase.getBytes(getCharset()));
		    
		    // Setup parms for the cipher
		    SecretKeySpec skeySpec = new SecretKeySpec(md.digest(), "RC2");
			Cipher cipher = Cipher.getInstance("RC2/ECB/NOPADDING");
			cipher.init(Cipher.DECRYPT_MODE, skeySpec, parm);
			
			// Decode the encrypted text and decrypt
			byte[] dString = Base64.decode(text);
			byte[] d = cipher.doFinal(dString);
			
			//String clearTextOld = decodeBytesOld(d);
			String clearTextNew = decodeBytes(d);
			return clearTextNew;
		} catch (NoSuchAlgorithmException e) {
			e.printStackTrace();
		} catch (NoSuchPaddingException e) {
			e.printStackTrace();
		} catch (InvalidKeyException e) {
			e.printStackTrace();
		} catch (InvalidAlgorithmParameterException e) {
			e.printStackTrace();
		} catch (IllegalBlockSizeException e) {
			e.printStackTrace();
		} catch (BadPaddingException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}			
		return "";
	}