aes

Simple AES encryption decryption with openssl library in C

眉间皱痕 提交于 2019-11-28 11:27:14
I want to encrypt a struct containing few String and then decrypt it. I tried following code. The original code is found from the web and it was working perfectly. I change the input of it to a struct. following is the code. #include <stdio.h> #include <stdlib.h> #include <string.h> #include <time.h> #include <openssl/aes.h> #include <openssl/rand.h> typedef struct ticket { /* test field */ int ticketId; char username[20]; char date[20]; } USR_TICKET; // a simple hex-print routine. could be modified to print 16 bytes-per-line static void hex_print(const void* pv, size_t len) { const unsigned

PyCrypto problem using AES+CTR

冷暖自知 提交于 2019-11-28 11:07:52
I'm writing a piece of code to encrypt a text using symmetric encryption. But it's not coming back with the right result... from Crypto.Cipher import AES import os crypto = AES.new(os.urandom(32), AES.MODE_CTR, counter = lambda : os.urandom(16)) encrypted = crypto.encrypt("aaaaaaaaaaaaaaaa") print crypto.decrypt(encrypted) Here, the decrypted text is different from the original. I don't really understand much about cryptography so please bear with me. I understand the CTR mode requires a "counter" function to supply a random counter each time, but why does it need it to be 16 bytes when my key

【Python实现AES加密】

穿精又带淫゛_ 提交于 2019-11-28 11:00:31
原文: http://blog.gqylpy.com/gqy/392 AES (Advanced Encryption Standard) 高级加密标准 ,在密码学中又被称为 Rijndael 加密法,是美国联邦政府采用的一种区块加密标准。这个标准用来替代原先的 DES ,已经被多方分析且广为全世界所使用。经过五年的甄选流程,AES由美国国家标准与技术研究院(NIST)于2001年11月26日发布于FIPS PUB 197,并在2002年5月26日成为有效的标准。2006年,AES已经成为对称密钥加密中最流行的算法之一。 AES在 软件 及 硬件 上都能快速地进行加密解密,相对来说较易于实作,且只需要很少的存储器。作为一个新的加密标准,目前正在被部署应用到更广大的范围。 特点 抵抗所有已知的攻击 在多个平台上速度快,编码紧凑 设计简单 原理 AES为分组密码,分组密码就是把明文分成一组一组的,没组长度相等,每次加密一组数据,直到加密完整个明文。在AES标准规范中,分组长度只能是 128 位,也就是说,每个分组为 16 字节(每个字节8位)。密钥的长度可以使用 128 位、 192 位或 256 位。密钥的长度不同,推荐加密轮数也不同。一般常用的 128 位。 基本用法 import binascii from Cryptodome.Cipher import AES from

java之--加密、解密算法

别等时光非礼了梦想. 提交于 2019-11-28 10:54:54
0 、概述 在项目开发中,我们常需要用到加解密算法,加解密算法主要分为三大类: 1、对称加密算法,如: AES 、 DES 、 3DES 2、非对称加密算法,如: RSA 、 DSA 、 ECC 3、散列算法,如: MD5 、 SHA1 、 HMAC 1 、各算法对比 不废话,直接开表格对比: 对称加密算法(加解密密钥相同) 名称 密钥长度 运算速度 安全性 资源消耗 DES 56位 较快 低 中 3DES 112位或168位 慢 中 高 AES 128、192、256位 快 高 低 非对称算法(加密密钥和解密密钥不同) 名称 成熟度 安全性(取决于密钥长度) 运算速度 资源消耗 RSA 高 高 慢 高 DSA 高 高 慢 只能用于数字签名 ECC 低 高 快 低(计算量小,存储空间占用小,带宽要求低) 散列算法比较 名称 安全性 速度 SHA-1 高 慢 MD5 中 快 对称与非对称算法比较 名称 密钥管理 安全性 速度 对称算法 比较难,不适合互联网,一般用于内部系统 中 快好几个数量级(软件加解密速度至少快100倍,每秒可以加解密数M比特数据),适合大数据量的加解密处理 非对称算法 密钥容易管理 高 慢,适合小数据量加解密或数据签名 3 、项目中常用总结 对称加密: AES(128位), 非对称加密: ECC(160位)或RSA(1024), 消息摘要: MD5 数字签名

AES Encrypt/Decrypt Delphi & PHP

百般思念 提交于 2019-11-28 10:35:46
My Delphi application uses TurboPower LockBox 3 to encrypt a plaintext information using AES 256. I now want to decrypt this information using PHP. But TurboPower LockBox 3 has some interoperability issues. Please check the post by LockBox 3 author here for details : http://lockbox.seanbdurkin.id.au/tiki-view_forum_thread.php?comments_parentId=363&topics_offset=1 And a similar post on Stackoverflow Secure keypair encryption solution in Delphi & PHP? In LockBox 3, during encryption, you set a password. This password is then used as a seed to generate the key and iv. So has anyone been able to

Can I use AES in CTR mode in .NET?

↘锁芯ラ 提交于 2019-11-28 09:46:11
.NET's AES does not implement CTR directly. It only implements CBC, CFB, CTS, ECB and OFB. Can I use any of these modes and securely implement CTR around them, or do I need to use a different library altogether? Yes, you can build a CTR using .NET's AES in ECB mode and a counter, that you yourself initialize and increment, for each block encrypted. An example of this is the WinZipAes encryption stream, which is part of the open-source DotNetZip. WinZip specifies the use of AES encryption for encrypted ZIP files, using AES in CTR mode. DotNetZip implements the CTR mode using ECB and the counter

AES-256/CBC encryption with OpenSSL and decryption in C#

烈酒焚心 提交于 2019-11-28 09:37:48
问题 I am a newbie to cryptography. My requirement is to decrypt/encrypt the text that is encrypted/decrypted using openssl. The algorithm that we are using is aes-256-cbc in the Openssl. So, I am trying to implement the same functionality in my application. so far after a lot of googling all i was able to do is.. private static string Encryptor(string TextToEncrypt) { //Turn the plaintext into a byte array. byte[] PlainTextBytes = System.Text.ASCIIEncoding.ASCII.GetBytes(TextToEncrypt); //Setup

How to encrypt plaintext with AES-256 CBC in PHP using OpenSSL?

ε祈祈猫儿з 提交于 2019-11-28 09:31:05
I am trying to encrypt sensitive user data like personal messages in my php powered website before entering into the database. I have researched a bit on the internet and I have found the few important things to remember: Never use mcrypt, it's abandonware. AES is based on the Rijndael algorithm and has been unbroken till now. AES has also been recommended by NSA and used in US Government data encryption, but since the NSA is recommending it, there's a chance they might sneak upon my user data easily. Blowfish has been unbroken as well, but slow and less popular. So, I decided I will give it a

Turbopower Lockbox3 - Can I control initialization vector and padding for AES-256 encryption?

*爱你&永不变心* 提交于 2019-11-28 09:22:58
问题 In the process of moving from Delphi2007 to XE2, we are thinking about switching encryption libraries from DCPCrypt to Turbopower Lockbox 3. a) In DCPCrypt I have explicit control over the initialization vector. How would I set the IV in TPLB3? b) DCPCrypt has no padding, we pad the plaintext with zeroes before encryption. How does TPLB pad? We could still do it ourselves of course. Test Vector Cipher = AES-256; Chaining mode = CBC; Termination = C# style all-zero-padding; IV transmission =

Null character in encrypted data

China☆狼群 提交于 2019-11-28 09:19:26
问题 Is it possible that after cbc encryption, null character appears in the resulting multibyte data. If yes, what precaution should I take to avoid it. 回答1: Is it possible that after cbc encryption, null character appears in the resulting multibyte data. Absolutely. It would not be a pseudo-random function if values like 0's were missing. If yes, what precaution should I take to avoid it. Treat everything as a byte array with embedded NULL s. Never treat it like a char* . If you want to treat it