<s>
VIA	B-Device
PadLock	I-Device
is	O
a	O
central	B-General_Concept
processing	I-General_Concept
unit	I-General_Concept
(	O
CPU	O
)	O
instruction	B-General_Concept
set	I-General_Concept
extension	O
to	O
the	O
x86	B-Operating_System
microprocessor	I-Operating_System
instruction	B-General_Concept
set	I-General_Concept
architecture	I-General_Concept
(	O
ISA	O
)	O
found	O
on	O
processors	O
produced	O
by	O
VIA	O
Technologies	O
and	O
Zhaoxin	B-Device
.	O
</s>
<s>
Introduced	O
in	O
2003	O
with	O
the	O
VIA	O
Centaur	O
CPUs	O
,	O
the	O
additional	O
instructions	O
provide	O
hardware-accelerated	O
random	O
number	O
generation	O
(	O
RNG	O
)	O
,	O
Advanced	B-Algorithm
Encryption	I-Algorithm
Standard	I-Algorithm
(	O
AES	B-Algorithm
)	O
,	O
SHA-1	B-Algorithm
,	O
SHA256	B-Algorithm
,	O
and	O
Montgomery	B-Algorithm
modular	I-Algorithm
multiplication	I-Algorithm
.	O
</s>
<s>
The	O
PadLock	O
instruction	B-General_Concept
set	I-General_Concept
can	O
be	O
divided	O
into	O
four	O
subsets	O
:	O
</s>
<s>
The	O
padlock	O
capability	O
is	O
indicated	O
via	O
a	O
CPUID	B-Architecture
instruction	O
with	O
EAX	O
=	O
0xC0000000	O
.	O
</s>
<s>
VIA	B-Device
PadLock	I-Device
found	O
on	O
some	O
Zhaoxin	B-Device
CPUs	O
have	O
SM3	B-Algorithm
hashing	O
and	O
SM4	B-Algorithm
block	O
cipher	O
added	O
.	O
</s>
<s>
All	O
VIA	O
Nano	O
CPUs	O
support	O
SHA	O
,	O
AES	B-Algorithm
,	O
and	O
RNG	O
.	O
</s>
<s>
All	O
VIA	O
Eden	O
CPUs	O
since	O
2003	O
(	O
C3	O
Nehemiah	O
)	O
support	O
AES	B-Algorithm
and	O
RNG	O
.	O
</s>
<s>
All	O
these	O
released	O
since	O
2006	O
support	O
AES	B-Algorithm
,	O
RNG	O
,	O
SHA	O
,	O
and	O
PMM	O
.	O
</s>
<s>
All	O
VIA	O
C7	O
CPUs	O
support	O
AES	B-Algorithm
,	O
RNG	O
,	O
SHA	O
,	O
and	O
PMM	O
.	O
</s>
<s>
Linux	B-Operating_System
kernel	I-Operating_System
since	O
2.6.11	O
has	O
PadLock	O
AES	B-Algorithm
.	O
</s>
<s>
OpenBSD	B-Operating_System
and	O
FreeBSD	B-Operating_System
support	O
PadLock	O
.	O
</s>
<s>
OpenSSL	B-Language
supports	O
PadLock	O
AES	B-Algorithm
and	O
SHA	O
since	O
2004	O
(	O
0.9.7f/0.9.8a	O
)	O
.	O
</s>
<s>
GNU	B-Application
assembler	I-Application
supports	O
PadLock	O
since	O
2004	O
.	O
</s>
