AES加密，CBC模式，0填充

Posted 2021-02-17 jakin3130

java的aes加密的CBC模式只有NoPadding，PKCS5Padding，PKCS7Padding，因此0填充需要手动更改

public static byte[] encrypt(byte[] data, byte[] iv, byte[] key) {
    if(key.length != 16) {
        throw new RuntimeException("Invalid AES key length (must be 16 bytes)");
    } else {
        try {
            SecretKeySpec secretKey = new SecretKeySpec(key, "AES");
            byte[] enCodeFormat = secretKey.getEncoded();
            SecretKeySpec seckey = new SecretKeySpec(enCodeFormat, "AES");
            Cipher cipher = Cipher.getInstance("AES/CBC/NoPadding");
            int blockSize=cipher.getBlockSize();
            int length=data.length;
            if(length%blockSize!=0){
                length=length+(blockSize-(length%blockSize));
            }
            byte[] plaintext=new byte[length];
            System.arraycopy(data,0,plaintext,0,data.length);
            IvParameterSpec ivSpec = new IvParameterSpec(iv);
            cipher.init(1, seckey, ivSpec);
            byte[] result = cipher.doFinal(plaintext);
            return result;
        } catch (Exception var9) {
            throw new RuntimeException("encrypt fail!", var9);
        }
    }
}