采用c RSA加密解密 [英] rsa encryption decryption using c

问题描述

我试着写的RSA加密C code和使用Open SSL解密。但我不能这样做。我GOOGLE了它但无论code，我从网上得到它是从我的头。
主函数放在这里，我从堆栈溢出了。我试着用它...但它不工作。可能是我不好。

I'm trying to write C code of RSA encryption and decryption using Open SSL. But I am not able to do so. I googled it but whatever code I got from internet it was out of my head. main function goes here which I got from stack overflow. I tried using it … but its not working. May be my bad.

encrypt(FILE *rsa_Pkey_fole,FILE *in_file,FILE *out_file){

}

int main(int argc, char *argv[])
{
    FILE *rsa_pkey_file, *infile;
    int rv;

    if (argc < 2) {
            fprintf(stderr, "Usage: %s <PEM RSA Public Key File>\n", argv[0]);
            exit(1);
    }

    rsa_pkey_file = fopen(argv[1], "rb");
    infile = fopen(argv[2], "w");
    if (!rsa_pkey_file) {
        perror(argv[1]);
        fprintf(stderr, "Error loading PEM RSA Public Key File.\n");
        exit(2);
    }

    rv = encrypt(rsa_pkey_file, infile.txt, stdout);
    fclose(rsa_pkey_file);

    return rv;
}

和类似的方式解密。

我该怎么办RSA加密和简单的方式使用Open SSL库在C文件解密？

How can I do RSA encryption and decryption of a file using Open SSL library in C in simple way?

推荐答案

对于RSA加密的步骤如下：

Steps for RSA encryption are as follows:

1. 阅读公钥到 RSA * 结构。这取决于你的密钥格式。如果关键是在 PEM 格式，请使用 PEM_read_RSA_PUBKEY 功能。如果是在 DER 的形式，使用 d2i_RSA 。


2. 加密使用RSA公共密钥数据。使用 RSA_public_encrypt 功能。


3. 将数据写入到文件或任何你想做的事情。

1. Read the public key into RSA * structure. It depends on your key format. If key is in PEM format, use PEM_read_RSA_PUBKEY functions. If it is in DER form, use d2i_RSA.
2. Encrypt your data using RSA public key. Use RSA_public_encrypt function.
3. Write the data to file or whatever you want to do.

有关RSA解密步骤是：

Steps for RSA decryption are:

1. 读取专用钥匙插入 RSA * 结构。这是类似于RSA加密与一些微小的差别步骤1。


2. 是 RSA_private_decrypt 解密数据。使用 RSA_private_decrypt 。

1. Read the private key into RSA * structure. It is similar to step 1 in RSA encryption with some minor difference.
2. Decrypt the data using RSA_private_decrypt. Use RSA_private_decrypt.

您可以看看OpenSSL文档这是相当有用的，它的名称是直观的。我只给你广泛的层面上的想法。如果您需要更多的帮助，我可以张贴code的例子。

You can look OpenSSL documentation which is quite useful and its names are intuitive. I give you just broad level idea. If you need more help, I can post the code example.

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