<s>
wolfSSL	B-Protocol
is	O
a	O
small	O
,	O
portable	O
,	O
embedded	O
SSL/TLS	B-Protocol
library	B-Library
targeted	O
for	O
use	O
by	O
embedded	O
systems	O
developers	O
.	O
</s>
<s>
It	O
is	O
an	O
open	B-Application
source	I-Application
implementation	O
of	O
TLS	B-Protocol
(	O
SSL	B-Protocol
3.0	O
,	O
TLS	B-Protocol
1.0	O
,	O
1.1	O
,	O
1.2	O
,	O
1.3	O
,	O
and	O
DTLS	B-Protocol
1.0	O
,	O
1.2	O
,	O
and	O
1.3	O
)	O
written	O
in	O
the	O
C	B-Language
programming	I-Language
language	I-Language
.	O
</s>
<s>
It	O
includes	O
SSL/TLS	B-Protocol
client	O
libraries	O
and	O
an	O
SSL/TLS	B-Protocol
server	O
implementation	O
as	O
well	O
as	O
support	O
for	O
multiple	O
APIs	O
,	O
including	O
those	O
defined	O
by	O
SSL	B-Protocol
and	O
TLS	B-Protocol
.	O
</s>
<s>
wolfSSL	B-Protocol
also	O
includes	O
an	O
OpenSSL	B-Language
compatibility	O
interface	O
with	O
the	O
most	O
commonly	O
used	O
OpenSSL	B-Language
functions	O
.	O
</s>
<s>
A	O
predecessor	O
of	O
wolfSSL	B-Protocol
,	O
yaSSL	B-Protocol
is	O
a	O
C++	B-Language
based	O
SSL	B-Protocol
library	B-Library
for	O
embedded	O
environments	O
and	O
real	O
time	O
operating	O
systems	O
with	O
constrained	O
resources	O
.	O
</s>
<s>
wolfSSL	B-Protocol
is	O
currently	O
available	O
for	O
Win32/64	B-Library
,	O
Linux	B-Application
,	O
macOS	B-Application
,	O
Solaris	B-Application
,	O
ESP32	B-Device
,	O
ESP8266	B-Device
,	O
Threadx	B-Operating_System
,	O
VxWorks	B-Operating_System
,	O
FreeBSD	B-Operating_System
,	O
NetBSD	B-Device
,	O
OpenBSD	B-Operating_System
,	O
embedded	B-Application
Linux	I-Application
,	O
Yocto	B-Application
Project	I-Application
,	O
OpenEmbedded	B-Application
,	O
WinCE	B-Operating_System
,	O
Haiku	B-Language
,	O
OpenWrt	B-Application
,	O
iPhone	B-Device
,	O
Android	B-Application
,	O
Nintendo	B-Operating_System
Wii	I-Operating_System
and	O
Gamecube	B-Application
through	O
DevKitPro	O
support	O
,	O
QNX	B-Operating_System
,	O
MontaVista	B-Operating_System
,	O
Tron	O
variants	O
,	O
NonStop	B-Architecture
OS	I-Architecture
,	O
OpenCL	B-Application
,	O
Micrium	O
's	O
MicroC/OS	B-Operating_System
-II	I-Operating_System
,	O
FreeRTOS	B-Operating_System
,	O
SafeRTOS	O
,	O
Freescale	B-Operating_System
MQX	I-Operating_System
,	O
Nucleus	B-Operating_System
,	O
TinyOS	B-Device
,	O
TI-RTOS	B-Operating_System
,	O
HP-UX	B-Application
,	O
uTasker	O
,	O
uT-kernel	O
,	O
embOS	O
,	O
INtime	B-Operating_System
,	O
mbed	B-Operating_System
,	O
RIOT	B-Device
,	O
CMSIS-RTOS	O
,	O
FROSTED	O
,	O
Green	B-Operating_System
Hills	I-Operating_System
INTEGRITY	I-Operating_System
,	O
Keil	O
RTX	O
,	O
TOPPERS	O
,	O
PetaLinux	O
,	O
Apache	B-Device
Mynewt	I-Device
,	O
and	O
PikeOS	B-Operating_System
.	O
</s>
<s>
The	O
genesis	O
of	O
yaSSL	B-Protocol
,	O
or	O
yet	O
another	O
SSL	B-Protocol
,	O
dates	O
to	O
2004	O
.	O
</s>
<s>
OpenSSL	B-Language
was	O
available	O
at	O
the	O
time	O
,	O
and	O
was	O
dual	O
licensed	O
under	O
the	O
OpenSSL	B-Language
License	O
and	O
the	O
SSLeay	O
license	O
.	O
</s>
<s>
yaSSL	B-Protocol
,	O
alternatively	O
,	O
was	O
developed	O
and	O
dual-licensed	O
under	O
both	O
a	O
commercial	O
license	O
and	O
the	O
GPL	B-License
.	O
</s>
<s>
yaSSL	B-Protocol
offered	O
a	O
more	O
modern	O
API	O
,	O
commercial	O
style	O
developer	O
support	O
and	O
was	O
complete	O
with	O
an	O
OpenSSL	B-Language
compatibility	O
layer	O
.	O
</s>
<s>
The	O
first	O
major	O
user	O
of	O
wolfSSL/CyaSSL/yaSSL	O
was	O
MySQL	B-Application
.	O
</s>
<s>
Through	O
bundling	O
with	O
MySQL	B-Application
,	O
yaSSL	B-Protocol
has	O
achieved	O
extremely	O
high	O
distribution	O
volumes	O
in	O
the	O
millions	O
.	O
</s>
<s>
In	O
February	O
2019	O
,	O
Daniel	O
Stenberg	O
,	O
the	O
creator	O
of	O
cURL	B-Language
,	O
joined	O
the	O
wolfSSL	B-Protocol
project	O
.	O
</s>
<s>
The	O
wolfSSL	B-Protocol
lightweight	O
SSL	B-Protocol
library	B-Library
implements	O
the	O
following	O
protocols	O
:	O
</s>
<s>
SSL	B-Protocol
2.0	O
–	O
SSL	B-Protocol
2.0	O
was	O
deprecated	O
(	O
prohibited	O
)	O
in	O
2011	O
by	O
RFC	O
6176	O
.	O
wolfSSL	B-Protocol
does	O
not	O
support	O
it	O
.	O
</s>
<s>
SSL	B-Protocol
3.0	O
–	O
SSL	B-Protocol
3.0	O
was	O
deprecated	O
(	O
prohibited	O
)	O
in	O
2015	O
by	O
RFC	O
7568	O
.	O
</s>
<s>
In	O
response	O
to	O
the	O
POODLE	B-Protocol
attack	I-Protocol
,	O
SSL	B-Protocol
3.0	O
has	O
been	O
disabled	O
by	O
default	O
since	O
wolfSSL	B-Protocol
3.6.6	O
,	O
but	O
can	O
be	O
enabled	O
with	O
a	O
compile-time	O
option	O
.	O
</s>
<s>
wolfSSL	B-Protocol
uses	O
the	O
following	O
cryptography	O
libraries	O
:	O
</s>
<s>
By	O
default	O
,	O
wolfSSL	B-Protocol
uses	O
the	O
cryptographic	O
services	O
provided	O
by	O
wolfCrypt	O
.	O
</s>
<s>
wolfCrypt	O
Provides	O
RSA	B-Architecture
,	O
ECC	O
,	O
DSS	O
,	O
Diffie	B-Protocol
–	I-Protocol
Hellman	I-Protocol
,	O
EDH	B-Device
,	O
NTRU	O
,	O
DES	B-Algorithm
,	O
Triple	B-Algorithm
DES	I-Algorithm
,	O
AES	B-Algorithm
(	O
CBC	O
,	O
CTR	O
,	O
CCM	O
,	O
GCM	O
)	O
,	O
Camellia	B-Algorithm
,	O
IDEA	B-Algorithm
,	O
ARC4	B-Algorithm
,	O
HC-128	B-Algorithm
,	O
ChaCha20	O
,	O
MD2	B-Algorithm
,	O
MD4	B-Algorithm
,	O
MD5	B-Algorithm
,	O
SHA-1	B-Algorithm
,	O
SHA-2	B-Algorithm
,	O
SHA-3	B-Algorithm
,	O
BLAKE2	B-Algorithm
,	O
RIPEMD-160	B-Algorithm
,	O
Poly1305	B-Algorithm
,	O
Random	O
Number	O
Generation	O
,	O
Large	O
Integer	O
support	O
,	O
and	O
base	O
16/64	O
encoding/decoding	O
.	O
</s>
<s>
An	O
experimental	O
cipher	O
called	O
Rabbit	B-Algorithm
,	O
a	O
public	B-Application
domain	I-Application
software	I-Application
stream	B-Algorithm
cipher	I-Algorithm
from	O
the	O
EU	O
's	O
eSTREAM	O
project	O
,	O
is	O
also	O
included	O
.	O
</s>
<s>
Rabbit	B-Algorithm
is	O
potentially	O
useful	O
to	O
those	O
encrypting	O
streaming	O
media	O
in	O
high	O
performance	O
,	O
high	O
demand	O
environments	O
.	O
</s>
<s>
wolfCrypt	O
also	O
includes	O
support	O
for	O
the	O
recent	O
Curve25519	O
and	O
Ed25519	B-Algorithm
algorithms	O
.	O
</s>
<s>
wolfCrypt	O
acts	O
as	O
a	O
back-end	O
crypto	O
implementation	O
for	O
several	O
popular	O
software	O
packages	O
and	O
libraries	O
,	O
including	O
MIT	B-Protocol
Kerberos	I-Protocol
(	O
where	O
it	O
can	O
be	O
enabled	O
using	O
a	O
build	O
option	O
)	O
.	O
</s>
<s>
CyaSSL+	O
includes	O
NTRU	O
public	O
key	O
encryption	O
.	O
</s>
<s>
The	O
addition	O
of	O
NTRU	O
in	O
CyaSSL+	O
was	O
a	O
result	O
of	O
the	O
partnership	O
between	O
yaSSL	B-Protocol
and	O
Security	O
Innovation	O
.	O
</s>
<s>
Several	O
cipher	O
suites	O
utilizing	O
NTRU	O
are	O
available	O
with	O
CyaSSL+	O
including	O
AES-256	B-Algorithm
,	O
RC4	B-Algorithm
,	O
and	O
HC-128	B-Algorithm
.	O
</s>
<s>
wolfSSL	B-Protocol
supports	O
the	O
following	O
Secure	B-Device
Elements	I-Device
:	O
</s>
<s>
wolfSSL	B-Protocol
supports	O
the	O
following	O
hardware	O
technologies	O
:	O
</s>
<s>
The	O
following	O
tables	O
list	O
wolfSSL	B-Protocol
's	O
support	O
for	O
using	O
various	O
devices	O
 '	O
hardware	O
encryption	O
with	O
various	O
algorithms	O
.	O
</s>
<s>
wolfSSL	B-Protocol
supports	O
the	O
following	O
certifications	O
:	O
</s>
<s>
wolfSSL	B-Protocol
is	O
dual	O
licensed	O
:	O
</s>
<s>
Licensed	O
under	O
the	O
GPL-2.0-or-later	B-License
license	O
.	O
</s>
<s>
This	O
is	O
good	O
for	O
GPL	B-License
open	B-Application
source	I-Application
projects	O
and	O
evaluation	O
.	O
</s>
