pem格式证书转换为der格式证书的C++代码示例
时间: 2023-10-23 07:12:05 浏览: 67
以下是将PEM格式证书转换为DER格式证书的C++代码示例:
```c++
#include <iostream>
#include <fstream>
#include <vector>
#include <openssl/bio.h>
#include <openssl/pem.h>
#include <openssl/x509.h>
using namespace std;
int main(int argc, char **argv) {
if (argc != 3) {
cout << "Usage: pem2der input.pem output.der" << endl;
return 1;
}
// 读取PEM格式证书
ifstream pem_file(argv[1]);
if (!pem_file.is_open()) {
cout << "Failed to open input file " << argv[1] << endl;
return 1;
}
string pem_data((istreambuf_iterator<char>(pem_file)), istreambuf_iterator<char>());
BIO *pem_bio = BIO_new_mem_buf(pem_data.c_str(), pem_data.size());
X509 *x509 = PEM_read_bio_X509(pem_bio, NULL, NULL, NULL);
BIO_free(pem_bio);
if (!x509) {
cout << "Failed to read PEM certificate" << endl;
return 1;
}
// 将X509证书转换为DER格式
int der_len = i2d_X509(x509, NULL);
vector<unsigned char> der_data(der_len);
unsigned char *der_ptr = der_data.data();
i2d_X509(x509, &der_ptr);
X509_free(x509);
// 写入DER格式证书
ofstream der_file(argv[2], ios::binary);
if (!der_file.is_open()) {
cout << "Failed to open output file " << argv[2] << endl;
return 1;
}
der_file.write(reinterpret_cast<const char *>(der_data.data()), der_data.size());
der_file.close();
cout << "Successfully converted PEM certificate to DER format" << endl;
return 0;
}
```
这段代码使用了OpenSSL库中的BIO和X509函数来读取PEM格式证书并将其转换为DER格式。可以通过编译器链接OpenSSL库来编译这段代码。