C ++ OpenSSL Four: CER converted to PEM

1. Equivalent to: openssl x509 -in "cer_path" -inform DER -out "save_path" -outform PEM

2. The code is as follows: cerFilePath is cer file; cer file after the file request csr obtained.

bool MakePemSSL(const char* cerFilePath, const char* savePemFilePath) {
    int      ret = 0;
    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 != 1) {
        fprintf(stderr, "MakeLocalPemSSL failed to PEM_write_X509 \n");
        goto free_all;
    }

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

    return (ret == 1);
}

the above.

 

"One of the C ++ OpenSSL: compile and use"
, "C ++ OpenSSL II: generate RSA File"
"Three C ++ OpenSSL's: Generating a CSR file"
, "C ++ OpenSSL Four: CER converted to PEM"
"C ++ OpenSSL five: generate P12 file "

Reproduced in: https: //www.cnblogs.com/chevin/p/11041763.html