des

DES encryption function give me a cipher text that is wrong

痴心易碎 提交于 2019-12-24 07:19:35
问题 I have written the DES algorithm in haskell, but when i tried it, it doesn't give the correct output, i have tested every function on its own, they seem to work correctly, i have taken a message to encrypt: plainText = 123456ABCD132536 with the key = AABB09182736CCDD, when encrypted with DES it suppose to give me as output cipherText = C0B7A8D05F3A829C. The subkeys are all (K1..K16) correct, l0, r0 are correct as well , so are l1, r1 , l2, r2 , but at round 3 , i get r3 = B00A9591 , but its

DES encryption of 8 bytes plain text results in 16 bytes array

懵懂的女人 提交于 2019-12-23 12:42:26
问题 I am using this code to encrypt a 8 bytes PlainText with a 8 bytes Key but the result is always a 16 bytes array. public static byte[] Encrypt(byte[] PlainText, byte[] key) { MemoryStream ms = new MemoryStream(); DESCryptoServiceProvider mDES = new DESCryptoServiceProvider(); mDES.Mode = CipherMode.ECB; mDES.Key = key; CryptoStream encStream = new CryptoStream(ms, mDES.CreateEncryptor(), CryptoStreamMode.Write); BinaryWriter bw = new BinaryWriter(encStream); bw.Write(PlainText); bw.Close();

In a “C” program how can I store a hexadecimal value in a string variable?

有些话、适合烂在心里 提交于 2019-12-23 04:36:33
问题 I have a program which takes the input data as a plaintext and then decrypts the message using 3DES method in CBC mode. But the values are hardcoded in the program I want to provide the encrypted value myself which should be decryted. How can I do this in the following program? int main(void) { unsigned char in[BUFSIZE], out[BUFSIZE], back[BUFSIZE]; unsigned char *e = out; int len; DES_cblock key; DES_cblock seed = {0xFE, 0xDC, 0xBA, 0x98, 0x76, 0x54, 0x32, 0x10}; DES_cblock ivsetup = {0xE1,

Go加密解密之DES

﹥>﹥吖頭↗ 提交于 2019-12-23 03:20:21
一、DES简介 DES(Data Encryption Standard)是对称加密算法,也就是加密和解密用相同的密钥。其入口参数有三个:key、data、mode。key为加密解密使用的密钥,data为加密解密的数据,mode为其工作模式。当模式为加密模式时,明文按照64位进行分组,形成明文组,key用于对数据加密,当模式为解密模式时,key用于对数据解密。实际运用中,密钥只用到了64位中的56位,这样才具有高的安全性。DES 的常见变体是三重 DES,使用 168 位的密钥对资料进行三次加密的一种机制;它通常(但非始终)提供极其强大的安全性。如果三个 56 位的子元素都相同,则三重 DES 向后兼容 DES。 DES加密,涉及到加密模式和填充方式,所以,和其他语言加解密时,应该约定好加密模式和填充方式。(模式定义了Cipher如何应用加密算法。改变模式可以容许一个块加密程序变为流加密程序。) 关于分组加密:分组密码每次加密一个数据分组,这个分组的位数可以是随意的,一般选择64或者128位。另一方面,流加密程序每次可以加密或解密一个字节的数据,这就使它比流加密的应用程序更为有用。 在用DES加密解密时,经常会涉及到一个概念:块(block,也叫分组),模式(比如cbc),初始向量(iv),填充方式(padding,包括none,用’\0′填充

浅谈DES加密算法

折月煮酒 提交于 2019-12-23 00:37:43
一、DES加密算法介绍 1、要求密钥必须是8个字节,即64bit长度 2、因为密钥是byte[8] , 代表字符串也可以是非可见的字节,可以与Base64编码算法一起使用 3、加密、解密都需要通过字节数组作为数据和密钥进行处理 二、对称加密 DES加密算法属于对称加密。 即利用指定的密钥,按照密码的长度截取数据,分成数据块,和密钥进行复杂的移位、算数运算或者数据处理等操作,形成只有特定的密码才能够解开的数据。 加密与解密用的是同一个密钥 三、相关类 1、Cipher: Java/Android要使用任何加密,都需要使用Cipher这个类 使用Cipher进行加密,解密处理,需要创建实例对象并初始化。采用工厂模式创建对象 Cipher cipher = Cipher.getInstance("算法名称"); cipher.init(加密/解密模式,Key秒); 2、Key: Key类是Java加密系统所有密码的父类 3、SecretKeyFactory: 对于DES加密解密,使用SecretKeyFactory生成,生成时需指定DESKeySpec 四、加密代码步骤 1. 获取Cipher对象,设置加密算法 Cipher cipher = Cipher.getInstance("DES"); 2、准备Key对象   2.1 DES加密算法使用DESKeySpec类

How can I do an ISO 9797-1 MAC with triple DES in C#?

萝らか妹 提交于 2019-12-22 05:18:04
问题 I've got a project which stipulates the following encryption rules for a 24 byte block of data. 1) Cryptography should be done using full triple DES MAC algorithm as defined in 9797-1 as MAC algorithm 3 with output transformation 3 without truncation and with DES in CBC mode as block cipher with ICV set to zeros. Last 8 bytes of encrypted data constitute the value we need. The program is saying the encryption done is wrong. Are there any other things I need to do to match the above spec? The

怎样操作vue.js使用3DES加密

为君一笑 提交于 2019-12-22 00:12:41
如何在VUE-CLI手脚架建立的工程中使用3des加密: 1 npm install crypto-js --save-dev 1 import CryptoJS from 'crypto-js' 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 //DES加密 Pkcs7填充方式 encryptByDES(message, key){ const keyHex = CryptoJS.enc.Utf8.parse(key); const encrypted = CryptoJS.DES.encrypt(message, keyHex, { mode: CryptoJS.mode.ECB, padding: CryptoJS.pad.Pkcs7 }); return encrypted.toString(); } //DES解密 decryptByDES(ciphertext, key){ const keyHex = CryptoJS.enc.Utf8.parse(key); // direct decrypt ciphertext const decrypted = CryptoJS.DES.decrypt({ ciphertext: CryptoJS.enc.Base64.parse

TripleDES key sizes - .NET vs Wikipedia

依然范特西╮ 提交于 2019-12-21 12:36:54
问题 According to Wikipedia, TripleDES supports 56, 112, and 168-bit key lengths, but the System.Cryptography.TripleDESCryptoServiceProvider.LegalKeySizes says it only accepts 128 and 192-bit key lengths. The system I'm developing needs to be interoperable (data encrypted by my code needs to be decryptable in PHP, Java, and Objective-C) and I don't who is correct in this case. So who should I believe? And how can I be sure my encrypted data is portable? 回答1: Wikipedia does not say TripleDES

使用keytool生成3DES密钥

廉价感情. 提交于 2019-12-20 20:32:49
keytool 简介 keytool生成3DES密钥 C:\Program Files\Java\jre1.8.0_161\bin>keytool -genseckey -alias test-TDES -keyalg DESede -keysize 168 -storetype jceks -keystore key-TDES.store 输入密钥库口令: 再次输入新口令: 输入 <test-TDES> 的密钥口令 (如果和密钥库口令相同, 按回车): Warning: JCEKS 密钥库使用专用格式。建议使用 "keytool -importkeystore -srckeystore key-TDES.store -destkeystore key-TDES.store -deststoretype pkcs12" 迁移到行业标准格式 PKCS12。 查看密钥库: C:\Program Files\Java\jre1.8.0_161\bin>keytool -list -v -storetype jceks -keystore key-TDES.store 输入密钥库口令: 密钥库类型: JCEKS 密钥库提供方: SunJCE 您的密钥库包含 1 个条目 别名: test-tdes 创建日期: 2018-5-22 条目类型: SecretKeyEntry **********

C# to Java DES encryption

孤人 提交于 2019-12-19 05:02:03
问题 Trying to create java class which will encrypt and decrypt as like C# code in below. Below is my code for C#, I need to convert it to Java. Can someone help me how to do it? I've been doing this for almost 2 days yet can't find any solutions on how to convert it. I am new to crypto. Note - It seems C# code used ACME libraries. But in my java, i should not use ACME jar files. public static string EncryptBase64(string key, string clearText) { if (key.Length > 8) key = key.Substring(0, 8); byte[