On Wed, Aug 31, 2011 at 09:58:58PM +0200, Edgar E. Iglesias wrote: > On Wed, Aug 31, 2011 at 03:45:45PM -0400, Stefan Berger wrote: > > This patch implements the TCG BIOS interrupt handler 1ah. It is for > > example used by trusted grub. > > > > This patch adds an implementation of SHA1 (following NIST specs., IETF RFC > > 3147 > > and Wikipedia) for speeding up measurements of code. Trusted Grub for > > example > > makes use of this interface and measures (calculates SHA1) of the Linux > > kernel > > and initrd. Those files can be rather large and hunting their bytes through > > the TIS interface as part of the int handler commands invoked by trusted > > grub > > does take quite some time due to the many vmexits the interface is creating > > (one per byte). > > > > There is also a threshold for the size of data to hash (100k) below which > > the TPM is used and above the internal faster SHA1 algorithm is used. > > Hi Stefan, > > A question: > Is there a reason for not reusing the SHA1 implementation from other > libraries, > like OpenSSL? > > I've got a couple of cryptographic device models on my end (some of them > that I may contribute at some point) that will need the various SHA hashes > and other ciphers. > > In my case, there might be tons of data beeing hashed and when available, > it would be nice to be able to use cryptographic hw acceleration which > may be provided by OpenSSL engines. Or even, just heavily optimized > assembly versions of them.
Woops, maybe this particular piece of code was not for QEMU proper... Cheers
