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Implemented matching of Optional PCR Composite field value when Hashing was done to reduce the size of it

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Optional Composite Hash Algorithm field is always present, has value of all zeroes if was not used
This commit is contained in:
Sansar Choinyambuu
2011-11-28 19:51:58 +01:00
committed by Andreas Steffen
parent 9b6473bb24
commit 379f7a7533
2 changed files with 33 additions and 7 deletions
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src/libpts/pts/pts.c
+18 -2
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@@ -1158,9 +1158,25 @@ METHOD(pts_t, get_quote_info, bool,
chunk_clear(&pcr_composite);
chunk_clear(&hash_pcr_composite);
chunk_clear(&pcr_composite);
/* Hash the PCR Composite Structure */
hasher->allocate_hash(hasher, pcr_composite, out_pcr_composite);
DBG4(DBG_PTS, "Hash of calculated PCR Composite: %B", out_pcr_composite);
hasher->destroy(hasher);
}
else
{
*out_pcr_composite = chunk_clone(pcr_composite);
DBG4(DBG_PTS, "calculated PCR Composite: %B", out_pcr_composite);
}
/* SHA1 hash of PCR Composite to construct TPM_QUOTE_INFO */
hasher = lib->crypto->create_hasher(lib->crypto, HASH_SHA1);
hasher->allocate_hash(hasher, pcr_composite, &hash_pcr_composite);
hasher->destroy(hasher);
writer->write_data(writer, *out_pcr_composite);
writer->write_data(writer, hash_pcr_composite);
chunk_clear(&pcr_composite);
chunk_clear(&hash_pcr_composite);
if (!this->secret.ptr)
{