Text only | Text with Images

newLISP Fan Club

Forum => newLISP in the real world => Topic started by: shercipher on May 11, 2009, 09:02:41 PM

Title: Importing C libraries
Post by: shercipher on May 11, 2009, 09:02:41 PM
I need to use the SHA1 function in libssl.so. The function has the following syntax:


Code Select

unsigned char *SHA1(const unsigned char *d, unsigned long n,
                  unsigned char *md);


With the explanation



SHA1() computes the SHA-1 message digest of the n bytes at d and places it in md (which must have space for SHA_DIGEST_LENGTH == 20 bytes of output). If md is NULL, the digest is placed in a static array.



So I was like okay, well I can't find a newLisp NULL, but I think nil should do it...

Tried


Code Select

(SHA1 etc (length etc) nil)


Which crashes with a segfault if I try to do that again.



So then I was like, okay, maybe I can store it in a variable:


Code Select

(SHA1 etc (length etc) *resultant*)


And reading *resultant* gives me


Code Select

?


Interesting. Anything else gives me segmentation faults. How can I get these two languages to work with each other, or is the answer "write a glue library"?
Title: Re: Importing C libraries
Post by: xytroxon on May 11, 2009, 10:47:48 PM
You can use the  "crypto.lsp"  module that is included in your newlisp module directory...



Read about it here:

//http://newlisp.nfshost.com/code/modules/crypto.lsp.html



-- xytroxon
Title:
Post by: shercipher on May 11, 2009, 11:03:01 PM
Too late, already wrote my own function. Will consider replacing if necessary later (I have doubts that mine works correctly).
Text only | Text with Images