Print out AppID

[nmoinvaz]

It would be great if the tool could also print out the extension's app id. Here is some code that I have scratched together real quick to do just that.

bool hexencode(char* buf, int size, char *target, int maxtarget) {
    static const char hexChars[] = "0123456789ABCDEF";
    int i = 0;
    for (i = 0; i < size; ++i) {
        target[(i * 2)] = hexChars[(buf[i] >> 4) & 0xf];
        target[(i * 2) + 1] = hexChars[buf[i] & 0xf];
    }
    return true;
}

void hextoidalpha(char* id, int idsize) {
    char x[] = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F };
    for (size_t i = 0; i < idsize; ++i) {
        id[i] = x[id[i]-'0'] + 'a';
    }
}

void generate_appid(char *buf, int size, char out[SHA256_DIGEST_LENGTH]) {
    SHA256_CTX sha;
    byte digest[SHA256_DIGEST_LENGTH];
    char hexDigest[SHA256_DIGEST_LENGTH * 2] = {0};
    SHA256_Init(&sha);
    SHA256_Update (&sha, buf, size);
    SHA256_Final(digest, &sha);
    hexencode((char *)digest, SHA256_DIGEST_LENGTH, hexDigest, SHA256_DIGEST_LENGTH*2);
    hextoidalpha(hexDigest, SHA256_DIGEST_LENGTH);
    strncpy(out, hexDigest, SHA256_DIGEST_LENGTH);
}

Then in main function after you convert the RSA PublicKey to DER format

    // Print the appid
    char appid[SHA256_DIGEST_LENGTH] = {0};
    generate_appid((char *)derkey,derlen,appid);
    printf("appid: %.32s\n", appid);

[nmoinvaz]

Optionally you could have it automatically dump to a file which can be useful for build purposes.

char appid_filename[320];
strncpy(appid_filename, output_filename, 320);
strncat(appid_filename, ".appid", 320);
FILE *appidfile = fopen(appid_filename,"wb");
if (appidfile) {
    fwrite(appid, 1, SHA256_DIGEST_LENGTH, appidfile);
    fclose(appidfile);
}

[kylehuff]

That's a good idea, I will see slate it for the next release (maybe a few weeks, I'm in the process of moving)

[kylehuff]

I've tagged this for v0.3 (projected release date of 27MAR14)