问题描述
是否有任何openssl api函数将PKCS7文件转换为PEM.我能够使用PKCS12_parse()函数将PKCS12文件转换为PEM,该函数将返回给定密码的密钥和证书. pkcs7没有类似的功能.
Is there any openssl api function to convert PKCS7 file to PEM. I am able to convert a PKCS12 file to PEM using PKCS12_parse() function which returns key and certificate given the password. There is no similar function for pkcs7.
我的pkcs7输入仅具有二进制格式的证书.我可以使用命令进行转换
My pkcs7 input has just the certificate in binary format. I am able to do the conversion using command
openssl pkcs7 -inform DER -in input.p7b -printcerts -text
如何在C程序中执行此操作?我可以将其读取为这样的PKCS7结构
How do I do this in a C program? I am able to read it to a PKCS7 structure like this
FILE* fp;
if (!(fp = fopen("ca.p7b", "rb"))) {
fprintf(stderr, "Error reading input pkcs7 file\n" );
exit(1);
}
PKCS7 *p7;
p7 = d2i_PKCS7_fp(cafp, NULL);
推荐答案
经过一番谷歌搜索后,我能够做到这一点.
After some googling I am able to do that.
if(p7->d.sign->cert != NULL){
PEM_write_X509(fp, sk_X509_value(p7->d.sign->cert, 0));
}
其中p7是指向pkcs7结构的指针,而fp是指向PEM文件的文件指针
where p7 is a pointer to pkcs7 struct and fp is the file pointer to PEM file
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