Greeting,
I've completed the harmonized digest interface for cryptoapi. I
really think people should start moving to something like this, make
life easier to deal with when new algorithms come along. Or when old
ones are broken!
I haven't made it kernel-friendly yet any pointers would be appreciated.
Summary:
At compile time you can specify 3 levels of optimization:
1. Small footprint (sha1 < 2k!)
2. Reasonable optimization
3. Fully optimized (make very large code >100K)
Each algorithm comes with a test bench console application to make
sure porting was successful.
The C-struct hasher_t contains both data and function pointers to the
appropriate hash algorithm. The example below should make it clear
how to use this, a complete example exists in hasher_test.c.
int main() {
hasher_t H;
u8 D[HASHER_MAX_DIGEST_SIZE];
if (hasher_setup(&H, "md5") != HASHER_OK) {
printf("Error: %d/%s\n", H.err, HasherErrorMsg(H.err));
return 1;
}
H.Init(&H);
H.Update(&H, "h", 1):
H.Update(&H, "ello", 4);
H.Update(&H, " there", 6);
H.Final(&H, D);
for (i=0; i<H.len; i++)
printf("%.2x ", D[i]);
printf("\n");
H.Init(&H);
H.Update(&H, "h", 1):
H.Update(&H, "ello", 4);
H.Update(&H, " THERE", 6);
H.Final(&H, D);
for (i=0; i<H.len; i++)
printf("%.2x ", D[i]);
printf("\n");
HasherTeardown(&H); // cleanse hasher_t
return 0;
}
I've used Doxygen to generate some purrty docs...
HTML API docs:
http://www.certainkey.com/~jlcooke/linux-crypto/digest/hasher_docs/html/
PDF API docs:
http://www.certainkey.com/~jlcooke/linux-crypto/digest/hasher_docs/latex/refman.pdf
Source code tar ball:
http://www.certainkey.com/~jlcooke/linux-crypto/digest/TAR_BALLS/hasher_src.tar.gz
API docs tar ball:
http://www.certainkey.com/~jlcooke/linux-crypto/digest/TAR_BALLS/hasher_docs.tar.gz
Cheers,
JLC
--
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Ottawa ON, K1S 5B6
C: 613.263.2983
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Linux-crypto: cryptography in and on the Linux system
Archive: http://mail.nl.linux.org/linux-crypto/
