AES加密-Key代与OpenSSL的 [英] AES Encryption -Key Generation with OpenSSL

问题描述

作为参考，作为延续到后：
<一href=\"http://stackoverflow.com/questions/5136279/how-to-use-openssl-to-decrypt-java-aes-encrypted-data\">how要使用OpenSSL解密的Java AES加密的数据？

As a reference and as continuation to the post: how to use OpenSSL to decrypt Java AES-encrypted data?

我有以下几个问题。

我使用OpenSSL库和编程℃，数据AES-CBC-128加密。
我给出任何输入的二进制数据，我有加密此。

I am using OpenSSL libs and programming in C for encrypting data in aes-cbc-128. I am given any input binary data and I have to encrypt this.

我知道Java有一个CipherParameters界面设置IV和KeyParameters了。

I learn that Java has a CipherParameters interface to set IV and KeyParameters too.

有没有一种方法来生成IV和使用OpenSSL的关键？总之何以在C程序中使用调用的OpenSSL随机数发生器用于这些目的。可以在此任你提供一些文档/例子/链接？

Is there a way to generate IV and a key using openSSL? In short how could one use in a C program to call the random generator of openSSL for these purposes. Can any of you provide some docs/examples/links on this?

感谢

推荐答案

这是AES密钥和对称加密的IV，只是bunchs随机字节。因此，任何加密的强随机数生成器会做的伎俩。 OpenSSL提供了这样一个随机数发生器（这本身无论操作系统提供，如 CryptGenRandom（）在Windows或的/ dev /随机和的/ dev / urandom的在Linux上）。该功能是 RAND_bytes（）。因此，code是这样的：

An AES key, and an IV for symmetric encryption, are just bunchs of random bytes. So any cryptographically strong random number generator will do the trick. OpenSSL provides such a random number generator (which itself feeds on whatever the operating system provides, e.g. CryptGenRandom() on Windows or /dev/random and /dev/urandom on Linux). The function is RAND_bytes(). So the code would look like this:

#include <openssl/rand.h>

/* ... */
unsigned char key[16], iv[16];

if (!RAND_bytes(key, sizeof key)) {
    /* OpenSSL reports a failure, act accordingly */
}
if (!RAND_bytes(iv, sizeof iv)) {
    /* OpenSSL reports a failure, act accordingly */
}

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