C++ OpenSSL 之四：CER转换为PEM

1.等同于使用： openssl  x509 -in "cer_path" -inform DER -out "save_path" -outform PEM

2.代码如下：cerFilePath是cer文件；cer文件是csr文件请求后获得。

bool MakePemSSL(const char* cerFilePath, const char* savePemFilePath) {
    int      ret = ;
    X509 *x509 = NULL;
    FILE    *cerFile = NULL, *pemFile = NULL;

    cerFile = fopen(cerFilePath, "rb");
    if (cerFile == NULL) {
        fprintf(stderr, "MakeLocalPemSSL fopen cerFilePath err \n");
        goto free_all;
    }

    pemFile = fopen(savePemFilePath, "w+");
    if (pemFile == NULL) {
        fprintf(stderr, "MakeLocalPemSSL fopen savePemFilePath err \n");
        goto free_all;
    }

    x509 = d2i_X509_fp(cerFile, NULL);
    if (x509 == NULL) {
        fprintf(stderr, "MakeLocalPemSSL failed to parse to X509 from cerFile \n");
        goto free_all;
    }

    ret = PEM_write_X509(pemFile, x509);
    if (ret != ) {
        fprintf(stderr, "MakeLocalPemSSL failed to PEM_write_X509 \n");
        goto free_all;
    }

free_all:
    if (cerFile) fclose(cerFile);
    if (pemFile) fclose(pemFile);

    return (ret == );
}

以上。

《C++ OpenSSL 之一：编译和使用》
《C++ OpenSSL 之二：生成RSA文件》
《C++ OpenSSL 之三：生成CSR文件》
《C++ OpenSSL 之四：CER转换为PEM》
《C++ OpenSSL 之五：生成P12文件》