<s>
Crypto++	B-Language
(	O
also	O
known	O
as	O
CryptoPP	O
,	O
libcrypto++	O
,	O
and	O
libcryptopp	O
)	O
is	O
a	O
free	O
and	O
open-source	B-Application
C++	B-Language
class	O
library	B-Library
of	O
cryptographic	O
algorithms	O
and	O
schemes	O
written	O
by	O
Wei	O
Dai	O
.	O
</s>
<s>
Crypto++	B-Language
has	O
been	O
widely	O
used	O
in	O
academia	O
,	O
student	O
projects	O
,	O
open-source	B-Application
,	O
and	O
non-commercial	O
projects	O
,	O
as	O
well	O
as	O
businesses	O
.	O
</s>
<s>
Released	O
in	O
1995	O
,	O
the	O
library	B-Library
fully	O
supports	O
32-bit	O
and	O
64-bit	B-Device
architectures	I-Device
for	O
many	O
major	O
operating	O
systems	O
and	O
platforms	O
,	O
including	O
Android	O
(	O
using	O
STLport	B-Language
)	O
,	O
Apple	O
(	O
Mac	O
OS	O
X	O
and	O
iOS	O
)	O
,	O
BSD	B-Operating_System
,	O
Cygwin	B-Language
,	O
IBM	B-Application
AIX	I-Application
and	O
S/390	B-Device
,	O
Linux	B-Application
,	O
MinGW	B-Application
,	O
Solaris	B-Application
,	O
Windows	B-Application
,	O
Windows	B-Protocol
Phone	I-Protocol
and	O
Windows	B-Operating_System
RT	I-Operating_System
.	O
</s>
<s>
The	O
project	O
also	O
supports	O
compilation	B-Language
using	O
C++03	O
,	O
C++11	O
,	O
C++14	O
,	O
and	O
C++17	O
runtime	O
libraries	B-Library
;	O
and	O
a	O
variety	O
of	O
compilers	B-Language
and	O
IDEs	O
,	O
including	O
Borland	B-Application
Turbo	I-Application
C++	I-Application
,	O
Borland	B-Application
C++	I-Application
Builder	I-Application
,	O
Clang	B-Application
,	O
CodeWarrior	B-Operating_System
Pro	I-Operating_System
,	O
GCC	B-Application
(	O
including	O
Apple	O
's	O
GCC	B-Application
)	O
,	O
Intel	B-Language
C++	I-Language
Compiler	I-Language
(	O
ICC	O
)	O
,	O
Microsoft	B-Application
Visual	I-Application
C/C	I-Application
++	I-Application
,	O
and	O
Sun	B-Application
Studio	I-Application
.	O
</s>
<s>
Crypto++	B-Language
1.0	O
was	O
released	O
in	O
June	O
1995	O
,	O
but	O
the	O
download	O
is	O
no	O
longer	O
available	O
.	O
</s>
<s>
The	O
Crypto++	B-Language
1.0	O
release	O
was	O
withdrawn	O
due	O
to	O
RSA	B-Architecture
Data	O
Security	O
,	O
Inc	O
asserting	O
its	O
patent	O
over	O
the	O
RSA	B-Architecture
algorithm	I-Architecture
.	O
</s>
<s>
All	O
other	O
versions	O
of	O
the	O
library	B-Library
are	O
available	O
for	O
download	O
.	O
</s>
<s>
Crypto++	B-Language
ordinarily	O
provides	O
complete	O
cryptographic	O
implementations	O
and	O
often	O
includes	O
less	O
popular	O
,	O
less	O
frequently-used	O
schemes	O
.	O
</s>
<s>
For	O
example	O
,	O
Camellia	B-Algorithm
is	O
an	O
ISO/NESSIE/IETF	O
-approved	O
block	O
cipher	O
roughly	O
equivalent	O
to	O
AES	B-Algorithm
,	O
and	O
Whirlpool	B-Algorithm
is	O
an	O
ISO/NESSIE/IETF	O
-approved	O
hash	B-Algorithm
function	I-Algorithm
roughly	O
equivalent	O
to	O
SHA	O
;	O
both	O
are	O
included	O
in	O
the	O
library	B-Library
.	O
</s>
<s>
Additionally	O
,	O
the	O
Crypto++	B-Language
library	B-Library
sometimes	O
makes	O
proposed	O
and	O
bleeding-edge	O
algorithms	O
and	O
implementations	O
available	O
for	O
study	O
by	O
the	O
cryptographic	O
community	O
.	O
</s>
<s>
For	O
example	O
,	O
VMAC	B-Application
,	O
a	O
universal	O
hash-based	B-Algorithm
message	I-Algorithm
authentication	I-Algorithm
code	I-Algorithm
,	O
was	O
added	O
to	O
the	O
library	B-Library
during	O
its	O
submission	O
to	O
the	O
Internet	O
Engineering	O
Task	O
Force	O
(	O
CFRG	O
Working	O
Group	O
)	O
;	O
and	O
Brainpool	O
curves	O
,	O
proposed	O
in	O
March	O
2009	O
as	O
an	O
Internet	O
Draft	O
in	O
RFC	O
5639	O
,	O
were	O
added	O
to	O
Crypto++	B-Language
5.6.0	O
in	O
the	O
same	O
month	O
.	O
</s>
<s>
The	O
library	B-Library
also	O
makes	O
available	O
primitives	O
for	O
number-theoretic	O
operations	O
such	O
as	O
fast	O
multi-precision	O
integers	O
;	O
prime	O
number	O
generation	O
and	O
verification	O
;	O
finite	O
field	O
arithmetic	O
,	O
including	O
GF(p )	O
and	O
GF(2n )	O
;	O
elliptical	O
curves	O
;	O
and	O
polynomial	O
operations	O
.	O
</s>
<s>
Furthermore	O
,	O
the	O
library	B-Library
retains	O
a	O
collection	O
of	O
insecure	O
or	O
obsolescent	O
algorithms	O
for	O
backward	O
compatibility	O
and	O
historical	O
value	O
:	O
MD2	O
,	O
MD4	O
,	O
MD5	O
,	O
Panama	B-Algorithm
Hash	B-Algorithm
,	O
DES	O
,	O
ARC4	O
,	O
SEAL	O
3.0	O
,	O
WAKE	O
,	O
WAKE-OFB	O
,	O
DESX	O
(	O
DES-XEX3	O
)	O
,	O
RC2	O
,	O
SAFER	O
,	O
3-WAY	O
,	O
GOST	O
,	O
SHARK	O
,	O
CAST-128	O
,	O
and	O
Square	O
.	O
</s>
<s>
In	O
a	O
2007	O
ECRYPT	O
workshop	O
paper	O
focusing	O
on	O
public	B-Application
key	I-Application
implementations	O
of	O
eight	O
libraries	B-Library
,	O
Ashraf	O
Abusharekh	O
and	O
Kris	O
Kaj	O
found	O
that	O
"	O
Crypto++	B-Language
5.1	O
 [ sic ] 	O
leads	O
in	O
terms	O
of	O
support	O
for	O
cryptographic	O
primitives	O
and	O
schemes	O
,	O
but	O
is	O
the	O
slowest	O
of	O
all	O
investigated	O
libraries.	O
"	O
</s>
<s>
In	O
2008	O
,	O
speed	O
tests	O
carried	O
out	O
by	O
Timo	O
Bingmann	O
using	O
seven	O
open-source	B-Application
security	B-Library
libraries	I-Library
with	O
15	O
block	O
ciphers	O
,	O
Crypto++	B-Language
5.5.2	O
was	O
the	O
top-performing	O
library	B-Library
under	O
two	O
block	O
ciphers	O
and	O
did	O
not	O
rank	O
below	O
the	O
average	O
library	B-Library
performance	O
under	O
the	O
remaining	O
block	O
ciphers	O
.	O
</s>
<s>
Crypto++	B-Language
also	O
includes	O
an	O
auto-benchmarking	O
feature	O
,	O
available	O
from	O
the	O
command	O
line	O
(	O
cryptest.exe	O
b	O
)	O
,	O
the	O
results	O
of	O
which	O
are	O
available	O
at	O
Crypto++	B-Language
5.6.0	O
Benchmarks	O
.	O
</s>
<s>
As	O
with	O
many	O
other	O
cryptographic	O
libraries	B-Library
available	O
for	O
32-bit	O
and	O
64-bit	B-Device
x86	B-Operating_System
architectures	I-Operating_System
,	O
Crypto++	B-Language
includes	O
assembly	O
routines	O
for	O
AES	B-Algorithm
using	O
AES-NI	O
.	O
</s>
<s>
With	O
AES-NI	O
,	O
AES	B-Algorithm
performance	O
improves	O
dramatically	O
:	O
128-bit	O
AES/GCM	O
throughput	O
increases	O
from	O
approximately	O
28.0	O
cycles	O
per	O
byte	O
to	O
3.5	O
cycles	O
per	O
byte	O
.	O
</s>
<s>
Crypto++	B-Language
1.0	O
was	O
released	O
in	O
June	O
1995	O
.	O
</s>
<s>
Since	O
its	O
initial	O
release	O
,	O
the	O
library	B-Library
has	O
seen	O
nearly	O
two	O
dozen	O
revisions	O
,	O
including	O
an	O
architectural	O
change	O
in	O
version	O
5.0	O
.	O
</s>
<s>
Lawrence	O
Teo	O
's	O
compilation	B-Language
of	O
previous	O
Crypto++	B-Language
releases	O
dating	O
back	O
to	O
1995	O
can	O
be	O
found	O
in	O
the	O
users	O
group	O
archives	O
.	O
</s>
<s>
Crypto++	B-Language
has	O
received	O
three	O
Federal	O
Information	O
Processing	O
Standard	O
(	O
FIPS	O
)	O
140-2	O
Level	O
1	O
module	O
validations	O
with	O
no	O
post-validation	O
issues	O
.	O
</s>
<s>
Crypto++	B-Language
was	O
moved	O
to	O
the	O
CMVP	O
's	O
in	O
2016	O
.	O
</s>
<s>
The	O
move	O
effectively	O
means	O
the	O
library	B-Library
is	O
no	O
longer	O
validated	O
.	O
</s>
<s>
As	O
of	O
version	O
5.6.1	O
,	O
Crypto++	B-Language
consists	O
of	O
only	O
public	O
domain	O
files	O
,	O
with	O
a	O
compilation	B-Language
copyright	O
and	O
a	O
single	O
open	O
source	O
license	O
for	O
the	O
compilation	B-Language
copyright	O
:	O
</s>
