OpenSSL：已如何初始化公钥加密密钥？ [英] openSSL: how to initialize keys for public key encryption?

问题描述

有关使用OpenSSL API进行公钥加密，如何是关键（公众＆安培;民营）在C程序初始化，鉴于* .key文件格式的私钥，并在* .pem文件格式的公钥：

For using openSSL API for public key encryption, how is the key (public & private) initialized in a C program, given private key in *.key file format, and public key in *.pem file format:

 EVP_PKEY *key;
 /* How is key initialized ?
  */
  ctx = EVP_PKEY_CTX_new(key);

感谢。

推荐答案

试试这个：

        EVP_PKEY *pkey;
        FILE *f = fopen("<path for your PEM or DER encoded key>", "rb");
        if (f == NULL){
                // error handling...
        }
    //if your key is PEM encoded use this
        pkey = PEM_read_PUBKEY(f, NULL, NULL, NULL); // pkey now contains the pubKey. 
    //We are passing NULL to the others parameters because we dont need password to read a public key

    //if your key is DER encoded use this
        pkey = d2i_PUBKEY_fp(f, NULL);

        if (pkey == NULL){
                // error handling...
        }

我没有测试，但应该工作。

I didnt test but should work.

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