On Wed, Aug 15, 2007, Dan Spirlock wrote:
> Hello,
>
> I'm working on an application where I'd like to have the public key
> stored in a local variable and compiled with the app, but I'm getting
> a runtime error when I try to read the public key after it has been
> stored in a BIO_mem_buf. I've tried two different ways, but I get
> the same error each time. If I read the same public key from a file
> using PEM_read_RSA_PUBKEY(), it works fine. I generated a private/
> public key pair to test with. Here is an example I've tried:
>
> static char *pubKey = "-----BEGIN PUBLIC KEY-----
> \nMIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCvbB1yh71tGgX5wQ5PbYR+2V9K
> \nbmCqcVjbKdcsR9u91dfsXEeH+17kr6TPy2HQcAn1wk5jos8B78bSRLV8STs54Teq
> \nPa6Z4JrLim89+zgaxbS5k9W87oP06BZ2suf6fBB2M296UJbzBqSYCVTsxbEHQDbP\n/
> hSGRtueV5668F8qzwIDAQAB\n-----END PUBLIC KEY-----\n";
>
> BIO *pub_bio = BIO_new_mem_buf(pubKey, sizeof(pubKey);
> if(pub_bio == NULL)
> {
> ERR_print_errors_fp(stdout);
> return -1;
> }
>
> // rsaPubKey was previously initialized with RSA_new()
> rsaPubKey = PEM_read_bio_RSAPublicKey(pub_bio, &rsaPubKey, NULL, NULL);
> if(rsaPubKey == NULL) // always fails here
> {
> ERR_print_errors_fp(stdout);
> return -1;
> }
>
> The error is always: PEM_read_bio:no start line:pem_lib.c:
> 642:Expecting: RSA PUBLIC KEY
> I've added the \n newline characters to the pubKey variable, but I
> always get the same error. Is there something I'm missing in this
> process? I'm sure there is otherwise I wouldn't need to be posting to
> the list. :-)
>
> Thanks for any help that anyone can provide,
Two problems, the sizeof is wrong: you'll end up passing the size of a pointer
which isn't what you want. Pass -1 instead and it automatically does a
strlen() on the buffer.
Second problem, wrong public key format. Use PEM_read_bio_RSA_PUBKEY()
instead.
Steve.
--
Dr Stephen N. Henson. Email, S/MIME and PGP keys: see homepage
OpenSSL project core developer and freelance consultant.
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