I see the point. Thanks alot On Tue, Jul 20, 2010 at 12:47 AM, Mounir IDRASSI <mounir.idra...@idrix.net>wrote:
> Hi, > > When calling RSA_private_encrypt with RSA_NO_PADDING, the input must have > the same size as the RSA key modulus. > In your case, you are supplying 20 bytes whereas it certainly needs more > (for example, for a 1024 bit key, input must be 128 bytes long). So, you > have to add some sort of padding to your data before feeding it to > RSA_private_encrypt. > The other option is to use a standard padding by calling > RSA_private_encrypt with RSA_PKCS1_PADDING. > > I hope this clarifies things to you. > Cheers, > -- > Mounir IDRASSI > IDRIX > http://www.idrix.fr > > > On 7/19/2010 2:51 PM, anhpham wrote: > >> Hi all :x >> I encountered an error when using function RSA_private_encrypt with >> RSA_NO_PADDING option. >> I had an unsigned char array a with length = 20, RSA* r, >> unsigned char* sig = (unsigned char*) malloc(RSA_size(r)) and then I >> invoked >> function int i = RSA_private_encrypt(20,a ,sign,r,RSA_NO_PADDING ); The >> returned value i = -1 means that this function failed. However, when I >> invoked int i = RSA_private_encrypt(20,a,sig,r,RSA_PKCS1_PADDING ), it did >> run smoothly. I'm confused whether it is an error of the library or not >> but >> I don't know how to solve this problem. >> Please help me :-< >> > > ______________________________________________________________________ > OpenSSL Project http://www.openssl.org > User Support Mailing List openssl-users@openssl.org > Automated List Manager majord...@openssl.org >
