1. I am aware the input and output will work upon binary data, this isn't a problem for me. 2. I suppose I am not entirely aware of all potential pitfalls. 3. When working with hex data, BN_hex2bn would always segfault. My assumption was that the object needed to be extended to the proper size first.
On 6/9/07, Goetz Babin-Ebell <[EMAIL PROTECTED]> wrote:
--On Samstag, Juni 09, 2007 05:03:54 -0400 Richard <[EMAIL PROTECTED]> wrote: > Hello! My goal is to write a simple function for use in C programs of > mine that can encrypt and output strings. This would seem to be an easy > task at first, only through attempting it have I realized some > difficulties. beware: all encryption/decryption functions operate and generate binary data. So if you assume the output is a valid C string you will fail... > My idea was to use the openssl RSA library, build an RSA structure, and > use RSA_public_encrypt() to do this. I am currently unable to do this > even with just hardcoded RSA variables. Do you really want to use RSA for directly encrypting data ? I hope you are aware of the pitfalls doing this. > The reason is that I cannot > initiate a BN with a large value, as it can only start as a word. I > cannot find a way to expand the BN, except by using BN_set_bits(), which > seems to me an impractical way to do this. How is this generally done? There are the following functions available to set a BIGNUM: BIGNUM *BN_bin2bn(const unsigned char *s,int len,BIGNUM *ret); int BN_hex2bn(BIGNUM **a, const char *str); int BN_dec2bn(BIGNUM **a, const char *str); int BN_asc2bn(BIGNUM **a, const char *str); At least in recent releases there should be a man page available... Goetz -- DMCA: The greed of the few outweights the freedom of the many
