aes

对接接口中遇到一个棘手的问题：甲方使用java开发，通过AES加密数据，我方使用C#开发，Java的代码和C#的代码无法互通。 1 /// <summary> 2 /// AES加密（128位，密码模式ECB，填充类型PKCS5Padding或者PKCS7Padding。注：ECB模式不需要初始化向量iv。） 3 /// </summary> 4 /// <param name="str"></param> 5 /// <param name="key"></param> 6 /// <returns></returns> 7 public static string AES_Encrypt(string str, string key) 8 { 9 if (string.IsNullOrEmpty(str)) return null; 10 Byte[] toEncryptArray = Encoding.UTF8.GetBytes(str); 11 12 RijndaelManaged rm = new RijndaelManaged 13 { 14 Key = Convert.FromBase64String(key), 15 Mode = CipherMode.ECB, 16 Padding = PaddingMode.PKCS7 17 }; 18 19

i am trying to decrypt one string in c# encrypted in Delphi with Cipher1 3.0, Part I from Delphi Encryption Compendium. I use TCipher_Rijndael. string that i encrypt is : this-is-a-test-example password: pass encrypted values is : iKBC8kX4ZEk4A1pCj6jwEegqjpxhqw== When i try to decrypt this in c# i recive error: Length of the data to decrypt is invalid. Did anyone have the same problem, and what is a solution? Here is a decrypt method in c#: public static byte[] Decrypt(byte[] cipherData, byte[] Key, byte[] IV) { MemoryStream ms = new MemoryStream(); Rijndael alg = Rijndael.Create(); alg.Key =

I need to crypt in md5 a string in my program. There is the lib openssl but I'm a newbie about it. How is possible crypt a string using that and where I can find a good doc that teach me how to use this lib, also with other function like aes? I've tried this code: int main() { unsigned char result[MD5_DIGEST_LENGTH]; const unsigned char* str; str = (unsigned char*)"hello"; unsigned int long_size = 100; MD5(str,long_size,result); } But the compiler told me: undefined reference to MD5 . Why is there and undefined reference to MD5 ? Morten Kristensen You should take a look at the documentation .

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package com.jx.utlis; import java.io.IOException; import java.io.UnsupportedEncodingException; import java.security.InvalidKeyException; import java.security.NoSuchAlgorithmException; import java.security.SecureRandom; import java.util.Scanner; import javax.crypto.BadPaddingException; import javax.crypto.Cipher; import javax.crypto.IllegalBlockSizeException; import javax.crypto.KeyGenerator; import javax.crypto.NoSuchPaddingException; import javax.crypto.SecretKey; import javax.crypto.spec.SecretKeySpec; import sun.misc.BASE64Decoder; import sun.misc.BASE64Encoder; /* * AES对称加密和解密 */ public

AES算法简介 　　AES的全称是Advanced Encryption Standard，意思是高级加密标准。 AES密码分组大小和密钥大小可以为128位、192位和256位。然而AES只要求分组大小为128位。本文只对分组大小128位，密钥长度也为128位的Rijndael算法进行分析。密钥长度为192位和256位的处理方式和128位的处理方式类似，只不过密钥长度每增加64位，算法的循环次数就增加2轮，128位循环10轮、192位循环12轮、256位循环14轮。 　　 AES算法使用逻辑就是：发送方将要发送的明文数据X使用秘钥K进行AES加密后会得到密文Y，将密文进行网络传输，接受方在收到密文Y后使用秘钥K进行AES解密后技能得到明文X,这样即使密文Y在网络上传输时被截获了，没有秘钥也难以破解其真实意思。 AES算法相关数学知识 　　在AES算法中的MixColumn层中会用到伽罗瓦域中的乘法运算，而伽罗瓦域的运算涉及一些数学知识如下： 素域： 　　有限域有时也称伽罗瓦域，它指的是由有限个元素组成的集合，在这个集合内可以执行加、减、乘和逆运算。而在密码编码学中，我们只研究拥有有限个元素的域，也就是有限域。域中包含元素的个数称为域的阶。只有当m是一个素数幂时，即m=p n (其中n为正整数是p的次数，p为素数)，阶为m的域才存在。p称为这个有限域的特征。 也就是说

I am trying to implement AES-256 in CTR mode using nVidia CUDA. I have successfully coded CPU code for key expansion and now I need to implement the actual AES-256 algorithm. According to Wikipedia, some codes I've seen and particularly this PDF (page 9), AES rounds can be implemented as series of table lookups. My question is how do I generate these tables? I am aware that I need 4 KB to store these tables, and that is not a problem. I have spent whole day trying to find these tables with no success. The PDF I posted a link to mentions lookup tables T0, T1, T2 and T3, but I do not know what