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Windows driver: replace SHA512 by RIPEMD160 when calculating internal hash of master key to avoid calling KeSaveFloatingPointState/KeSaveExtendedProcessorState since SHA512 implementation uses SSE2/AVX and RIPEMD160 is pure C

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This commit is contained in:
Mounir IDRASSI 2019-01-30 11:48:07 +01:00
parent f02882ce60
commit 3c18d54d1e
No known key found for this signature in database
GPG Key ID: 02C30AE90FAE4A6F
2 changed files with 7 additions and 6 deletions
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2
src/Common/Crypto.h
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@ -246,7 +246,7 @@ typedef struct CRYPTO_INFO_t
uint16 HeaderVersion;
#ifdef TC_WINDOWS_DRIVER
unsigned __int8 master_keydata_hash[SHA512_DIGESTSIZE];
unsigned __int8 master_keydata_hash[RIPEMD160_DIGESTSIZE];
#else
CRYPTOPP_ALIGN_DATA(16) unsigned __int8 master_keydata[MASTER_KEYDATA_SIZE]; /* This holds the volume header area containing concatenated master key(s) and secondary key(s) (XTS mode). For LRW (deprecated/legacy), it contains the tweak key before the master key(s). For CBC (deprecated/legacy), it contains the IV seed before the master key(s). */
CRYPTOPP_ALIGN_DATA(16) unsigned __int8 k2[MASTER_KEYDATA_SIZE]; /* For XTS, this contains the secondary key (if cascade, multiple concatenated). For LRW (deprecated/legacy), it contains the tweak key. For CBC (deprecated/legacy), it contains the IV seed. */

11
src/Common/Volumes.c
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@ -529,11 +529,12 @@ KeyReady: ;
memcpy (keyInfo.master_keydata, header + HEADER_MASTER_KEYDATA_OFFSET, MASTER_KEYDATA_SIZE);
#ifdef TC_WINDOWS_DRIVER
{
sha512_ctx sha2;
sha512_begin (&sha2);
sha512_hash (keyInfo.master_keydata, MASTER_KEYDATA_SIZE, &sha2);
sha512_hash (header, sizeof(header), &sha2);
sha512_end (cryptoInfo->master_keydata_hash, &sha2);
RMD160_CTX ctx;
RMD160Init (&ctx);
RMD160Update (&ctx, keyInfo.master_keydata, MASTER_KEYDATA_SIZE);
RMD160Update (&ctx, header, sizeof(header));
RMD160Final (cryptoInfo->master_keydata_hash, &ctx);
burn(&ctx, sizeof (ctx));
}
#else
memcpy (cryptoInfo->master_keydata, keyInfo.master_keydata, MASTER_KEYDATA_SIZE);