aes

Input data must be multiple of cipher block size in AES CTR mode

由 别来无恙 提交于 2020-03-22 08:18:28
问题 I get this exception when I use Dart's encrypt package to decrypt something using AES CTR mode: E/flutter (19095): Invalid argument(s): Input data length must be a multiple of cipher's block size E/flutter (19095): #0 PaddedBlockCipherImpl.process (package:pointycastle/padded_block_cipher/padded_block_cipher_impl.dart:55:9) E/flutter (19095): #1 AES.decrypt (package:encrypt/src/algorithms/aes.dart:38:20) Here is my code: final encrypter = encrypt.Encrypter(encrypt.AES(key, mode: encrypt

Input data must be multiple of cipher block size in AES CTR mode

由 你。 提交于 2020-03-22 08:18:05
问题 I get this exception when I use Dart's encrypt package to decrypt something using AES CTR mode: E/flutter (19095): Invalid argument(s): Input data length must be a multiple of cipher's block size E/flutter (19095): #0 PaddedBlockCipherImpl.process (package:pointycastle/padded_block_cipher/padded_block_cipher_impl.dart:55:9) E/flutter (19095): #1 AES.decrypt (package:encrypt/src/algorithms/aes.dart:38:20) Here is my code: final encrypter = encrypt.Encrypter(encrypt.AES(key, mode: encrypt

Creating a Symmetric AES128 Key in SQL Server based on Key and Initial Vector

由 两盒软妹~` 提交于 2020-03-18 16:40:28
问题 I have some Key and Initial Vector, which I'm using for encryption purposes in my .NET app. Let's say they are: Key = 0x0102030405060708090A0B0C0D0E IV = 0xA1A2A3A4A5A6A7A8A9AAABACADAE In some cases I would like to perform encryption on the SQL Server (not in the app), but decrypt the data in the app. I thought that I'll might be able to create a temporary symmetric key in the DB and perform encryption: CREATE SYMMETRIC KEY #TempKey WITH ALGORITHM = AES_128 , IDENTITY_VALUE = ??? , KEY_SOURCE

Creating a Symmetric AES128 Key in SQL Server based on Key and Initial Vector

由 我的未来我决定 提交于 2020-03-18 16:37:49
问题 I have some Key and Initial Vector, which I'm using for encryption purposes in my .NET app. Let's say they are: Key = 0x0102030405060708090A0B0C0D0E IV = 0xA1A2A3A4A5A6A7A8A9AAABACADAE In some cases I would like to perform encryption on the SQL Server (not in the app), but decrypt the data in the app. I thought that I'll might be able to create a temporary symmetric key in the DB and perform encryption: CREATE SYMMETRIC KEY #TempKey WITH ALGORITHM = AES_128 , IDENTITY_VALUE = ??? , KEY_SOURCE

Key verification in AES

由 大城市里の小女人 提交于 2020-03-18 15:40:41
问题 If the user enters a wrong key for AES decryption, some garbage data is generated. I want to verify the given decryption key and throw an error if the key is incorrect. How can I verify the key entered by the user? 回答1: Use an HMAC. The basic premise is that you run the plaintext through an HMAC, add the result to the plaintext and then encrypt. Then do the opposite when decrypting. If the plaintext and HMAC result match, then you know you've got the correct key. OR, if you want to know prior

Key verification in AES

由 女生的网名这么多〃 提交于 2020-03-18 15:40:19
问题 If the user enters a wrong key for AES decryption, some garbage data is generated. I want to verify the given decryption key and throw an error if the key is incorrect. How can I verify the key entered by the user? 回答1: Use an HMAC. The basic premise is that you run the plaintext through an HMAC, add the result to the plaintext and then encrypt. Then do the opposite when decrypting. If the plaintext and HMAC result match, then you know you've got the correct key. OR, if you want to know prior

Need help using the Crypto++ library for AES256, their documentation isn't written all that well [closed]

由 时间秒杀一切 提交于 2020-03-18 10:22:15
问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 9 days ago . so I have a project for a dll file already setup and everything, what I'm trying to do is create a function inside it that basically handles decrypting/encrypting the contents of several files. I'm currently pushing the file contents into the function as a const char*, file sizes

Need help using the Crypto++ library for AES256, their documentation isn't written all that well [closed]

由 本秂侑毒 提交于 2020-03-18 10:21:33
问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 9 days ago . so I have a project for a dll file already setup and everything, what I'm trying to do is create a function inside it that basically handles decrypting/encrypting the contents of several files. I'm currently pushing the file contents into the function as a const char*, file sizes

Java 加密 AES 对称加密算法

由 為{幸葍}努か 提交于 2020-03-13 15:38:58
版权声明：本文为博主原创文章，未经博主允许不得转载。 【AES】 一种对称加密算法，DES的取代者。 加密相关文章见： Java 加密解密 对称加密算法 非对称加密算法 MD5 BASE64 AES RSA 【代码】 代码比较多，有一部分非本文章内容代码，具体自己看吧。 [java] view plain copy package com.uikoo9.util.encrypt; import java.math.BigInteger; import java.security.MessageDigest; import java.security.SecureRandom; import javax.crypto.Cipher; import javax.crypto.KeyGenerator; import javax.crypto.spec.SecretKeySpec; import sun.misc.BASE64Decoder; import sun.misc.BASE64Encoder; import com.uikoo9.util.QStringUtil; /** * 编码工具类 * 1.将byte[]转为各种进制的字符串 * 2.base 64 encode * 3.base 64 decode * 4.获取byte[]的md5值 * 5.获取字符串md5值 * 6

java AES加密

由 情到浓时终转凉″ 提交于 2020-03-08 05:35:08
对称加密算法 定义：在对称加密算法中，数据发信方将明文（ 原始数据 ）和加密 密钥 （mi yue）一起经过特殊加密算法处理后，使其变成复杂的加密密文发送出去。收信方收到密文后，若想解读原文，则需要使用加密用过的 密钥 及相同算法的逆算法对密文进行解密，才能使其恢复成可读明文。在对称加密算法中，使用的 密钥 只有一个，发收信双方都使用这个密钥对数据进行加密和解密，这就要求解密方事先必须知道加密密钥。 优点：算法公开、计算量小、加密速度快、加密效率高。 缺点： （1）交易双方都使用同样钥匙，安全性得不到保证。 （2）每对用户每次使用对称加密算法时，都需要使用其他人不知道的惟一钥匙，这会使得发收信双方所拥有的钥匙数量呈几何级数增长， 密钥管理 成为用户的负担。对称加密算法在分布式网络系统上使用较为困难，主要是因为 密钥管理 困难，使用成本较高。 AES五种加密模式 电码本模式（ECB） 将整个明文分成若干段相同的小段，然后对每一小段进行加密。 优：操作简单，易于实现；分组独立，易于并行；误差不会被传送。——简单，可并行，不传送误差。 缺：掩盖不了明文结构信息，难以抵抗统计分析攻击。——可对明文进行主动攻击。 密码分组链模式（CBC） 先将明文切分成若干小段，然后每一小段与初始块或者上一段的密文段进行异或运算后，再与密钥进行加密。 优点 ：能掩盖明文结构信息，保证相同密文可得不同明文
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