I've created a public key file using the following commands:
openssl genrsa -out mykey.pem 2046
openssl rsa -in mykey.pem -pubout > mykey.pub
I then read it from some C code:
public_key = PEM_read_RSA_PUBKEY(fp, NULL, NULL, NULL);
and then obtain the DER form of this public key:
int len = i2d_RSAPublicKey (public_key, NULL);
buf = (unsigned char *) malloc (len);
i2d_RSAPublicKey (public_key, &buf);
here len == 269
but the command line openssl tells me:
openssl rsa -outform der -pubin -inform pem -in mykey.pub | wc
writing RSA key
1 10 293
When I print out the DER forms from openssl and my C code they, obviously,
don't match and, oddly, the DER encoding that my C code obtains has a lot of
zeros.
What could I be doing wrong?
Regards,
Alan
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