实现android的AES加密技术(3)

    }    
        
    public static byte[] toByte(String hexString) {    
        int len = hexString.length()/2;    
        byte[] result = new byte[len];    
        for (int i = 0; i < len; i++)    
            result[i] = Integer.valueOf(hexString.substring(2*i, 2*i+2), 16).bytue();    
        return result;    
    }    
   
    public static String toHex(byte[] buf) {    
        if (buf == null)    
            return "";    
        StringBuffer result = new StringBuffer(2*buf.length);    
        for (int i = 0; i < buf.length; i++) {    
            appendHex(result, buf[i]);    
        }    
        return result.toString();    
    }    
    private final static String HEX = "0123456789ABCDEF";    
    private static void appendHex(StringBuffer sb, byte b) {    
        sb.append(HEX.charAt((b>>4)&0x0f)).append(HEX.charAt(b&0x0f));    
    }    
        
}  
 加密：String encryptingCode = SimpleCrypto.encrypt(masterPassword,originalText);
解密：String originalText = SimpleCrypto.decrypt(masterpassword, encryptingCode);

作者“技术交流”