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JobsDong/AES.java

Created August 12, 2016 10:06
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aes java encrypt
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AES.java
class AES {
public static void main(String[] args) throws NoSuchPaddingException, BadPaddingException, NoSuchAlgorithmException, IllegalBlockSizeException, IOException, InvalidKeyException, Base64DecodingException, InvalidAlgorithmParameterException {
String content = "this is a test";
String password = "1234567812345678";
System.out.println("before:" + content);
// encrypt
String encrypt = encode(content, "1234567812345678", password);
System.out.println("encrypt:" + encrypt);
// decrypt
String decrypt = decode(encrypt, "1234567812345678", password);
System.out.println("decrypt:" + decrypt);
}
public static final String decode(String content, String initVector, String password) throws NoSuchAlgorithmException, IOException, NoSuchPaddingException, InvalidKeyException, Base64DecodingException, BadPaddingException, IllegalBlockSizeException, InvalidAlgorithmParameterException {
IvParameterSpec iv = new IvParameterSpec(initVector.getBytes());
SecretKeySpec skeySpec = new SecretKeySpec(password.getBytes(), "AES");
Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
byte[] encrypted = new BASE64Decoder().decodeBuffer(content);
byte[] original = cipher.doFinal(encrypted);
return new String(original);
}
public static final String encode(String content, String initVector, String password) throws NoSuchAlgorithmException, UnsupportedEncodingException, NoSuchPaddingException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException, InvalidAlgorithmParameterException {
Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
int blockSize = cipher.getBlockSize();
byte[] bytes = content.getBytes();
int plainTextLength = bytes.length;
if (plainTextLength % blockSize != 0) {
plainTextLength = plainTextLength + (blockSize - (plainTextLength % blockSize));
}
byte[] plainText = new byte[plainTextLength];
System.arraycopy(bytes, 0, plainText, 0, bytes.length);
SecretKeySpec skeySpec = new SecretKeySpec(password.getBytes(), "AES");
IvParameterSpec iv = new IvParameterSpec(initVector.getBytes());
cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);
byte[] encrypted = cipher.doFinal(plainText);
return new BASE64Encoder().encode(encrypted);
}
}
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