Hello,
I'm would like to generate a key pair using the
openssl command line utilities and store them in
files. The private key will be used by a Java program
that will do the signing. The public key will be used
by a C++ program (using openssl lib) to do the
verification.
I am having trouble reconstituting the public key from
a DER format file. I generated the file as follows:
> openssl genrsa prikey.dat 2048
> openssl rsa -in pri_key.dat -out pub_key.der \
-outform DER -pubout
In my C++ program I read pub_key.der and attempt to
instantiate an RSA object:
char filename[] = "pub_key.der";
ifstream file1;
file1.open(filename, std::ios::binary);
char c;
while (file1.get(c)) {
bytes[i++] = (unsigned char) c;
}
file1.clear();
file1.close();
cout <<"Done reading public key - length is " << i
<< endl;
const unsigned char *p = (const unsigned char *)
bytes;
RSA *rsakey = NULL;
rsakey = d2i_RSAPublicKey(NULL, &p, i);
// alternatively: d2i_RSAPublicKey(&rsakey, &p,
i);
if (rsakey == NULL) {
cout << "error reconstituting public key" << endl;
return false;
}
//...continue
I get:
Done reading public key - length is 294
error reconstituting public key
Am I misunderstanding something about the
compatibility of "-outform DER" with
d2i_RSAPublicKey??
Thanks for any help,
Robin
PS
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