aes

When encrypting data that is not an even multiple of the block size do I have to send a complete last block?

由 随声附和 提交于 2020-02-02 07:15:12
问题 If I am using a block cipher such as AES which has a block size of 128 bits, what do I do if my data is not an even multiple of 128 bits? I am working with packets of data and do not want to change the size of my packet when encrypting it, yet my data is not an even multiple of 128? Does the AES block cipher allow handling of a final block that is short without changing the size of my message once encrypted? 回答1: That kind of detail depends on the chaining mode which you use. The chaining

When encrypting data that is not an even multiple of the block size do I have to send a complete last block?

由 耗尽温柔 提交于 2020-02-02 07:14:40
问题 If I am using a block cipher such as AES which has a block size of 128 bits, what do I do if my data is not an even multiple of 128 bits? I am working with packets of data and do not want to change the size of my packet when encrypting it, yet my data is not an even multiple of 128? Does the AES block cipher allow handling of a final block that is short without changing the size of my message once encrypted? 回答1: That kind of detail depends on the chaining mode which you use. The chaining

Add IV to beginning of CryptoStream

由 十年热恋 提交于 2020-02-01 09:08:06
问题 I'm implementing local encryption within an existing file management program. Much of the example code I can find, such as Microsoft's, demonstrates how to write directly to a file, but what I need to do is provide a stream that is consumed elsewhere in the program: CryptoStream GetEncryptStream(string filename) { var rjndl = new RijndaelManaged(); rjndl.KeySize = 256; rjndl.BlockSize = 256; rjndl.Mode = CipherMode.CBC; rjndl.Padding = PaddingMode.PKCS7; // Open read stream of unencrypted

AES Interoperability between PHP, Java, Javascript

由 痴心易碎 提交于 2020-02-01 08:46:07
问题 I'm developing a HTTP API that requires encryption. I have tried to use AES to get compatibility between Java, PHP and Javascript, but so far I have managed to get Java<->PHP and then Java<->Javascript, but not both PHP and Javascript at the same time. Has anyone had any experience with achieving interoperability between these languages and more? Any advice would be much appreciated. Thanks 回答1: To get AES to work across different systems, you have to make sure that everything is the same on

AES Interoperability between PHP, Java, Javascript

由 匆匆过客 提交于 2020-02-01 08:45:07
问题 I'm developing a HTTP API that requires encryption. I have tried to use AES to get compatibility between Java, PHP and Javascript, but so far I have managed to get Java<->PHP and then Java<->Javascript, but not both PHP and Javascript at the same time. Has anyone had any experience with achieving interoperability between these languages and more? Any advice would be much appreciated. Thanks 回答1: To get AES to work across different systems, you have to make sure that everything is the same on

Java Out of Memory Error during Encryption

由 痴心易碎 提交于 2020-01-30 10:58:59
问题 I am using AES to encrypt files. The problem first came when i tried to encrypt a large file. So i did some reading online and figured that i need to use a buffer and only encrypt bytes of data at a time. I divided my plaintext into chunks of 8192 bytes of data and then applied the encryption operation on each of these chunks but I am still getting the out of memory error. public static File encrypt(File f, byte[] key) throws Exception { System.out.println("Starting Encryption"); byte[]

Java Out of Memory Error during Encryption

由 放肆的年华 提交于 2020-01-30 10:55:18
问题 I am using AES to encrypt files. The problem first came when i tried to encrypt a large file. So i did some reading online and figured that i need to use a buffer and only encrypt bytes of data at a time. I divided my plaintext into chunks of 8192 bytes of data and then applied the encryption operation on each of these chunks but I am still getting the out of memory error. public static File encrypt(File f, byte[] key) throws Exception { System.out.println("Starting Encryption"); byte[]

MySQL - How to store AES_Encrypted data?

由 只谈情不闲聊 提交于 2020-01-29 04:27:07
问题 So I have been browsing the internet, and came across the MySQL built-in function AES_ENCRYPT. It doesn't seem too hard to use, but some sources tell me to store the encrypted data as a VARCHAR, and some say to store it as a BLOB. What should I store the encrypted data as? 回答1: Many encryption and compression functions return strings for which the result might contain arbitrary byte values. If you want to store these results, use a column with a VARBINARY or BLOB binary string data type. This

AES加密算法详解

由 点点圈 提交于 2020-01-27 03:55:51
简介 为比利时密码学家 Joan Daemen 和 Vincent Rijmen 所设计，又称 Rijndael 加密算法 常用填充算法：PKCS7 常用分组工作模式：GCM AES的三种密钥长度 AES的分组长度为128位（16字节） AES 密钥长度（32位比特） 分组长度（32位比特） 加密轮数 AES-128 4 4 10 AES-192 6 4 12 AES-256 8 4 14 AES的加密步骤 把明文按照 128bit（16 字节）拆分成若干个明文块，每个明文块是 4*4 矩阵 按照选择的填充方式来填充最后一个明文块 每一个明文块利用 AES 加密器和密钥，加密成密文块 拼接所有的密文块，成为最终的密文结果 来源： CSDN 作者： 梦之痕bhl 链接： https://blog.csdn.net/laing92/article/details/104032543

php java aes

由 喜欢而已 提交于 2020-01-26 21:59:48
class CryptAES { protected $cipher = MCRYPT_RIJNDAEL_128; protected $mode = MCRYPT_MODE_ECB; protected $pad_method = NULL; protected $secret_key = ''; protected $iv = ''; public function set_cipher($cipher){ $this->cipher = $cipher; } public function set_mode($mode){ $this->mode = $mode; } public function set_iv($iv){ $this->iv = $iv; } public function set_key($key){ $this->secret_key = $key; } public function require_pkcs5(){ $this->pad_method = 'pkcs5'; } protected function pad_or_unpad($str, $ext){ if ( is_null($this->pad_method) ){ return $str; }else{ $func_name = __CLASS__ . '::' . $this-
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