> From: owner-openssl-us...@openssl.org On Behalf Of pattabi raman
> Sent: Sunday, 10 April, 2011 08:14
> I am using the below code snippet and am able to do the encytption.
> But I need to convert the encrypted format to Binary format inorder
> to pass the encrypted key to a different system. Any one pls suggest
> how to do the same ???
What do you mean encrypted key? There is no encrypted key.
There is an encrypt*ion* key -- your file publkey.pem --
which you should already have obtained *from* the recipient.
Do you mean the encrypted *data*, which is implied to be CardPin?
The output (data) from RSA_public_encrypt is ALREADY binary.
And it is NOT a null-terminated C string, so
> sprintf(encpin,
> "%s",encrypted);
etc is wrong about 99.999999% of the time.
Note that most actual systems do not use just encryption;
they usually need to combine with additional information.
Perhaps what you need is some ASN.1 structure *containing*
your data, or an XML structure, etc etc.
Also, your code is hard to read. Frequently people post code
with too little white space, but yours has far too much.
In several places you check for an error and print a message,
but then proceed to use the null pointer anyway; if/when the
error arises, this will be very wrong. In most cases there is
additional information that would be helpful in your error
message(s): errno/strerror for fopen (or other I/O) problems,
or the OpenSSL error stack (e.g. ERR_print_errors_fp) for openssl.
Finally, you are assuming 256 bytes is enough for the RSA
encrypted value. If you ever get a publickey over 2048 bits
this will fail badly. It's safer to make this variable
if your environment or protocol allows that, or at least
check that the size of the key provided is not too big.
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