Re: [openssl-users] get type of PEM data

[Michael Wojcik]

enum pem_type {
        PEM_TYPE_NONE = 0,
        PEM_TYPE_CERTIFICATE,
        PEM_TYPE_RSA_PRIVATE
};

struct pem_map {
        enum pem_type type;
        const char *pem_string;
};

#include <openssl/pem.h>

enum pem_type identify_pem(const char *pem) {
        static const struct pem_map map[] = {
                { PEM_TYPE_CERTIFICATE, PEM_STRING_X509 "-----" },
                { PEM_TYPE_RSA_PRIVATE, PEM_STRING_RSA "-----" },
        };
        const char *pem_begin;
        int idx;

        if (!pem) return PEM_TYPE_NONE;

        if (! (pem_begin = strstr(pem, "-----BEGIN "))) return PEM_TYPE_NONE;
        pem_begin += 11;

        for (idx = 0; idx < sizeof map / sizeof *map; idx++) {
                if (strncmp(pem_begin, map[idx].pem_string, 
strlen(map[idx].pem_string)) == 0) {
                        return map[idx].type;
                }
        }

        return PEM_TYPE_NONE;
}

Untested. Extending to the remainder of the PEM types (see pem.h) is left as an 
exercise for the reader.

-- 
Michael Wojcik 
Distinguished Engineer, Micro Focus 



                        
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