Importing C libraries

[shercipher]

I need to use the SHA1 function in libssl.so. The function has the following syntax:

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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

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(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:

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(SHA1 etc (length etc) *resultant*)


And reading *resultant* gives me

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?


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"?

[xytroxon]

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



-- xytroxon

[shercipher]

Too late, already wrote my own function. Will consider replacing if necessary later (I have doubts that mine works correctly).