任何人都可以告诉我如何使用openssl API将.crt文件转换为.pem文件?我试过这样的:
FILE *fl = fopen(cert_filestr, "r");
fseek(fl, 0, SEEK_END);
long len = ftell(fl);
char *ret = malloc(len);
fseek(fl, 0, SEEK_SET);
fread(ret, 1, len, fl);
fclose(fl);
BIO* input = BIO_new_mem_buf((void*)ret, sizeof(ret));
x509 = d2i_X509_bio(input, NULL);
FILE* fd = fopen(certificateFile, "w+");
BIO* output = BIO_new_fp(fd, BIO_NOCLOSE);
X509_print_ex(output, x509, XN_FLAG_COMPAT, X509_FLAG_COMPAT);
fclose(fd);
但这不起作用,x509始终为NULL .
1 回答
.crt证书"may be encoded as binary DER or as ASCII PEM."(见http://info.ssl.com/article.aspx?id=12149) .
如果您的.crt文件已经过PEM编码,则无需转换它,只需将文件名从.crt更改为.pem即可 .
如果它被编码为DER,则将其转换为PEM,如下例所示: