Comparison of TLS implementations
The Transport Layer Security (TLS) protocol provides the ability to secure communications across or inside networks. This comparison of TLS implementations compares several of the most notable libraries . There are several TLS implementations which are free software and open source .
All comparison categories use the stable version of each implementation listed in the overview section. The comparison is limited to features that directly relate to the TLS protocol.
Overview
Implementation
Developed by
Open source
Software license
Copyright holder
Written in
Latest stable version, release date
Origin
Botan
Jack Lloyd
Yes
Simplified BSD License
Jack Lloyd
C++
3.6.1 (October 26, 2024; 2 months ago (2024-10-26 ) [ 1] ) [±]
US (Vermont)
BoringSSL
Google
Yes
OpenSSL-SSLeay dual-license , ISC license
Eric Young, Tim Hudson, Sun, OpenSSL project, Google, and others
C , C++ , Go , assembly
??
Australia/EU
Bouncy Castle
The Legion of the Bouncy Castle Inc.
Yes
MIT License
Legion of the Bouncy Castle Inc.
Java , C#
Java 1.79 / October 30, 2024; 2 months ago (2024-10-30 ) [ 2] Java LTS BC-LJA 2.73.7 / November 8, 2024; 2 months ago (2024-11-08 ) [ 3] Java FIPS BC-FJA 2.0.0 / July 30, 2024; 5 months ago (2024-07-30 ) [ 4] C# 2.4.0 / May 27, 2024; 7 months ago (2024-05-27 ) [ 5] C# FIPS BC-FNA 1.0.2 / March 11, 2024; 10 months ago (2024-03-11 ) [ 6]
Australia
BSAFE
Dell , formerly RSA Security
No
Proprietary
Dell
Java , C , assembly
SSL-J 6.6 (July 2, 2024; 6 months ago (2024-07-02 ) [ 7] ) [±]
SSL-J 7.3.1 (October 7, 2024; 3 months ago (2024-10-07 ) [ 8] ) [±]
Micro Edition Suite 5.0.3 (December 3, 2024; 52 days ago (2024-12-03 ) [ 9] ) [±]
Australia
cryptlib
Peter Gutmann
Yes
Sleepycat License and commercial license
Peter Gutmann
C
3.4.5 (2019; 6 years ago (2019 ) [ 10] ) [±]
NZ
GnuTLS
GnuTLS project
Yes
LGPL-2.1-or-later
Free Software Foundation
C
3.8.8[ 11] 2024-11-05
EU (Greece and Sweden)
Java Secure Socket Extension (JSSE)
Oracle
Yes
GNU GPLv2 and commercial license
Oracle
Java
23.0.1 (October 15, 2024; 3 months ago (2024-10-15 ) [ 12] ) [±]
21.0.5 LTS (October 15, 2024; 3 months ago (2024-10-15 ) [ 13] ) [±]
17.0.13 LTS (October 15, 2024; 3 months ago (2024-10-15 ) [ 14] ) [±]
11.0.25 LTS (October 15, 2024; 3 months ago (2024-10-15 ) [ 15] ) [±]
8u431 LTS (October 15, 2024; 3 months ago (2024-10-15 ) [ 16] ) [±]
US
LibreSSL
OpenBSD Project
Yes
Apache-1.0 , BSD-4-Clause , ISC , and public domain
Eric Young, Tim Hudson, Sun, OpenSSL project, OpenBSD Project, and others
C , assembly
4.0.0[ 17] 2024-10-14
Canada
MatrixSSL [ 18]
PeerSec Networks
Yes
GNU GPLv2 + and commercial license
PeerSec Networks
C
4.2.2 (September 11, 2019; 5 years ago (2019-09-11 ) [ 19] ) [±]
US
Mbed TLS (previously PolarSSL)
Arm
Yes
Apache License 2.0, GNU GPLv2 + and commercial license
Arm Holdings
C
3.6.2[ 20] (15 October 2024; 3 months ago (15 October 2024 ) ) [±]
EU (Netherlands)
Network Security Services (NSS)
Mozilla , AOL , Red Hat , Sun , Oracle , Google and others
Yes
MPL 2.0
NSS contributors
C , assembly
Standard 3.84 / October 12, 2022; 2 years ago (2022-10-12 ) [ 21] Extended Support Release 3.79.1 / August 18, 2022; 2 years ago (2022-08-18 ) [ 21]
US
OpenSSL
OpenSSL project
Yes
Apache-2.0 [ a]
Eric Young, Tim Hudson, Sun, OpenSSL project, and others
C , assembly
3.4.0[ 22] 2024-10-22
Australia/EU
Rustls
Joe Birr-Pixton, Dirkjan Ochtman, Daniel McCarney, Josh Aas, and open source contributors
Yes
Apache-2.0 , MIT License and ISC
Open source contributors
Rust
v0.23.19 (November 27, 2024; 58 days ago (2024-11-27 ) [ 23] ) [±]
United Kingdom
s2n
Amazon
Yes
Apache License 2.0, GNU GPLv2 + and commercial license
Amazon.com, Inc.
C
Continuous
US
Schannel
Microsoft
No
Proprietary
Microsoft Corporation
Windows 11, 2021-10-05
US
Secure Transport
Apple Inc.
Yes
APSL 2.0
Apple Inc.
57337.20.44 (OS X 10.11.2), 2015-12-08
US
wolfSSL (previously CyaSSL)
wolfSSL[ 24]
Yes
GNU GPLv2 + and commercial license
wolfSSL Inc.[ 25]
C , assembly
5.7.6 (December 31, 2024; 24 days ago (2024-12-31 ) [ 26] ) [±]
US
Erlang /OTP SSL application
Ericsson
Yes
Apache License 2.0
Ericsson
Erlang
OTP-21, 2018-06-19
Sweden
Implementation
Developed by
Open source
Software license
Copyright owner
Written in
Latest stable version, release date
Origin
TLS/SSL protocol version support
Several versions of the TLS protocol exist. SSL 2.0 is a deprecated[ 27] protocol version with significant weaknesses. SSL 3.0 (1996) and TLS 1.0 (1999) are successors with two weaknesses in CBC-padding that were explained in 2001 by Serge Vaudenay.[ 28] TLS 1.1 (2006) fixed only one of the problems, by switching to random initialization vectors (IV) for CBC block ciphers, whereas the more problematic use of mac-pad-encrypt instead of the secure pad-mac-encrypt was addressed with RFC 7366.[ 29] A workaround for SSL 3.0 and TLS 1.0, roughly equivalent to random IVs from TLS 1.1, was widely adopted by many implementations in late 2011.[ 30] In 2014, the POODLE vulnerability of SSL 3.0 was discovered, which takes advantage of the known vulnerabilities in CBC, and an insecure fallback negotiation used in browsers.[ 31]
TLS 1.2 (2008) introduced a means to identify the hash used for digital signatures. While permitting the use of stronger hash functions for digital signatures in the future (rsa,sha256/sha384/sha512) over the SSL 3.0 conservative choice (rsa,sha1+md5), the TLS 1.2 protocol change inadvertently and substantially weakened the default digital signatures and provides (rsa,sha1) and even (rsa,md5).[ 32]
Datagram Transport Layer Security (DTLS or Datagram TLS) 1.0 is a modification of TLS 1.1 for a packet-oriented transport layer, where packet loss and packet reordering have to be tolerated. The revision DTLS 1.2 based on TLS 1.2 was published in January 2012.[ 33]
TLS 1.3 (2018) specified in RFC 8446 includes major optimizations and security improvements. QUIC (2021) specified in RFC 9000 and DTLS 1.3 (2022) specified in RFC 9147 builds on TLS 1.3. The publishing of TLS 1.3 and DTLS 1.3 obsoleted TLS 1.2 and DTLS 1.2.
Note that there are known vulnerabilities in SSL 2.0 and SSL 3.0. In 2021, IETF published RFC 8996 also forbidding negotiation of TLS 1.0, TLS 1.1, and DTLS 1.0 due to known vulnerabilities. NIST SP 800-52 requires support of TLS 1.3 by January 2024. Support of TLS 1.3 means that two compliant nodes will never negotiate TLS 1.2.
NSA Suite B Cryptography
Required components for NSA Suite B Cryptography (RFC 6460) are:
Per CNSSP-15, the 256-bit elliptic curve (specified in FIPS 186-2), SHA-256, and AES with 128-bit keys are sufficient for protecting classified information up to the Secret level, while the 384-bit elliptic curve (specified in FIPS 186-2), SHA-384, and AES with 256-bit keys are necessary for the protection of Top Secret information.
Certifications
Note that certain certifications have received serious negative criticism from people who are actually involved in them.[ 75]
Implementation
FIPS 140-1 , FIPS 140-2 [ 76]
FIPS 140-3
Level 1
Level 2[disputed – discuss ]
Level 1
Botan [ 77]
Bouncy Castle
BC-FJA 1.0.0 (#2768) BC-FJA 1.0.1 (#3152)
BSAFE SSL-J[ 78]
Crypto-J 6.0 (1785 , 1786 ) Crypto-J 6.1 / 6.1.1.0.1 (2057 , 2058 ) Crypto-J 6.2 / 6.2.1.1 (2468 , 2469 ) Crypto-J 6.2.4 (3172 , 3184 ) Crypto-J 6.2.5 (#3819 , #3820 ) Crypto-J 6.3 (#4696 , #4697 )
Crypto-J 7.0 (4892 )
cryptlib [ 79]
GnuTLS [ 80]
Red Hat Enterprise Linux GnuTLS Cryptographic Module (#2780)
JSSE
LibreSSL [ 46]
no support
MatrixSSL [ 81]
SafeZone FIPS Cryptographic Module: 1.1 (#2389)
Mbed TLS [ 82]
NSS [ 83]
Network Security Services: 3.2.2 (#247) Network Security Services Cryptographic Module: 3.11.4 (#815), 3.12.4 (#1278), 3.12.9.1 (#1837)
Netscape Security Module: 1 (#7[ notes 1] ), 1.01 (#47[ notes 2] ) Network Security Services: 3.2.2 (#248[ notes 3] ) Network Security Services Cryptographic Module: 3.11.4 (#814[ notes 4] ), 3.12.4 (#1279, #1280[ notes 5] )
OpenSSL [ 84]
OpenSSL FIPS Object Module: 1.0 (#624), 1.1.1 (#733), 1.1.2 (#918), 1.2, 1.2.1, 1.2.2, 1.2.3 or 1.2.4 (#1051) 2.0, 2.0.1, 2.0.2, 2.0.3, 2.0.4, 2.0.5, 2.0.6, 2.0.7 or 2.0.8 (#1747)
Rustls
aws-lc FIPS module[ 85] (#4759 )
Schannel [ 86]
Cryptographic modules in Windows NT 4.0, 95, 95, 2000, XP, Server 2003, CE 5, CE 6, Mobile 6.x, Vista, Server 2008, 7, Server 2008 R2, 8, Server 2012, RT, Surface, Phone 8 See details on Microsoft FIPS 140 Validated Cryptographic Modules
Secure Transport
Apple FIPS Cryptographic Module: 1.0 (OS X 10.6, #1514), 1.1 (OS X 10.7, #1701) Apple OS X CoreCrypto Module; CoreCrypto Kernel Module: 3.0 (OS X 10.8, #1964, #1956), 4.0 (OS X 10.9, #2015, #2016) Apple iOS CoreCrypto Module; CoreCrypto Kernel Module: 3.0 (iOS 6, #1963, #1944), 4.0 (iOS 7, #2020, #2021)
wolfSSL [ 87]
wolfCrypt FIPS Module: 4.0 (#3389) See details on NIST certificate for validated Operating Environments wolfCrypt FIPS Module: 3.6.0 (#2425) See details on NIST certificate for validated Operating Environments
wolfCrypt FIPS Module (#4178) See details on NIST certificate
Implementation
Level 1
Level 2
Level 1
FIPS 140-1, FIPS 140-2
FIPS 140-3
Key exchange algorithms (certificate-only)
This section lists the certificate verification functionality available in the various implementations.
Key exchange algorithms (alternative key-exchanges)
Certificate verification methods
Encryption algorithms
Notes
^ a b This algorithm is not defined yet as TLS cipher suites in RFCs, is proposed in drafts.
^ a b authentication only, no encryption
^ This algorithm is implemented in an NSS fork used by Pale Moon .
Obsolete algorithms
Notes
^ a b c d IDEA and DES have been removed from TLS 1.2.[ 152]
^ a b c d e f 40 bits strength of cipher suites were designed to operate at reduced key lengths in order to comply with US regulations about the export of cryptographic software containing certain strong encryption algorithms (see Export of cryptography from the United States ). These weak suites are forbidden in TLS 1.1 and later.
^ a b The RC4 attacks weaken or break RC4 used in SSL/TLS. Use of RC4 is prohibited by RFC 7465.
^ a b The RC4 attacks weaken or break RC4 used in SSL/TLS.
Supported elliptic curves
This section lists the supported elliptic curves by each implementation.
Defined curves in RFC 8446 (for TLS 1.3) and RFC 8422, 7027 (for TLS 1.2 and earlier)
applicable TLS version
TLS 1.3 and earlier
TLS 1.2 and earlier
Implementation
secp256r1 prime256v1NIST P-256 (0x0017,[ 160] 23[ 161] )
secp384r1 NIST P-384 (0x0018,[ 160] 24[ 161] )
secp521r1 NIST P-521 (0x0019,[ 160] 25[ 161] )
X25519 (0x001D,[ 160] 29[ 161] )
X448 (0x001E,[ 160] 30[ 161] )
brainpoolP256r1 (26)[ 162]
brainpoolP384r1 (27)[ 162]
brainpoolP512r1 (28)[ 162]
Botan
Yes
Yes
Yes
Yes[ 134]
No
Yes[ 163]
Yes[ 163]
Yes[ 163]
BoringSSL
Yes
Yes
Yes (disabled by default)
Yes
No
No
No
No
BSAFE
Yes
Yes
Yes
No
No
No
No
No
GnuTLS
Yes
Yes
Yes
Yes[ 164]
Yes[ 165]
No
No
No
JSSE
Yes
Yes
Yes
Yesx25519: JDK 13+ [ 166] Ed25519:JDK 15+ [ 167]
Yesx448: JDK 13+ [ 166] Ed448: JDK 15+ [ 167]
No
No
No
LibreSSL
Yes
Yes
Yes
Yes[ 168]
No
Yes[ 46]
Yes[ 46]
Yes[ 46]
MatrixSSL
Yes
Yes
Yes
TLS 1.3 only[ 169]
No
Yes
Yes
Yes
Mbed TLS
Yes
Yes
Yes
Primitive only
Primitive only[ 171]
Yes
Yes
Yes
NSS
Yes
Yes
Yes
Yes[ 173]
No[ 174] [ 175]
No[ 176]
No[ 176]
No[ 176]
OpenSSL
Yes
Yes
Yes
Yes[ 177] [ 178]
Yes[ 179] [ 180]
Yes[ 59]
Yes[ 59]
Yes[ 59]
Rustls
Yes
Yes
No
Yes
No
No
No
No
Schannel Vista/2008, 7/2008R2, 8/2012, 8.1/2012R2, 10
Yes
Yes
Yes
No
No
No
No
No
Secure Transport
Yes
Yes
Yes
No
No
No
No
No
wolfSSL
Yes
Yes
Yes
Yes[ 181]
Yes[ 182]
Yes
Yes
Yes
Erlang /OTP SSL application
Yes
Yes
Yes
No
No
Yes
Yes
Yes
Implementation
secp256r1 prime256v1NIST P-256 (0x0017, 23)
secp384r1 NIST P-384 (0x0018, 24)
secp521r1 NIST P-521 (0x0019, 25)
X25519 (0x001D, 29)
X448 (0x001E, 30)
brainpoolP256r1 (26)
brainpoolP384r1 (27)
brainpoolP512r1 (28)
Deprecated curves in RFC 8422
Implementation
sect163k1NIST K-163 (1)[ 88]
sect163r1 (2)[ 88]
sect163r2NIST B-163 (3)[ 88]
sect193r1 (4)[ 88]
sect193r2 (5)[ 88]
sect233k1NIST K-233 (6)[ 88]
sect233r1NIST B-233 (7)[ 88]
sect239k1 (8)[ 88]
sect283k1NIST K-283 (9)[ 88]
sect283r1NIST B-283 (10)[ 88]
sect409k1NIST K-409 (11)[ 88]
sect409r1NIST B-409 (12)[ 88]
sect571k1NIST K-571 (13)[ 88]
sect571r1NIST B-571 (14)[ 88]
Botan
No
No
No
No
No
No
No
No
No
No
No
No
No
No
BoringSSL
No
No
No
No
No
No
No
No
No
No
No
No
No
No
BSAFE
Yes
No
Yes
No
No
Yes
Yes
No
Yes
Yes
Yes
Yes
Yes
Yes
GnuTLS
No
No
No
No
No
No
No
No
No
No
No
No
No
No
JSSE
Notes[ a] [ b]
Notes[ a] [ b]
Notes[ a] [ b]
Notes[ a] [ b]
Notes[ a] [ b]
Notes[ a] [ b]
Notes[ a] [ b]
Notes[ a] [ b]
Notes[ a] [ b]
Notes[ a] [ b]
Notes[ a] [ b]
Notes[ a] [ b]
Notes[ a] [ b]
Notes[ a] [ b]
LibreSSL
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
MatrixSSL
No
No
No
No
No
No
No
No
No
No
No
No
No
No
Mbed TLS
No
No
No
No
No
No
No
No
No
No
No
No
No
No
NSS
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
OpenSSL
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Rustls
No
No
No
No
No
No
No
No
No
No
No
No
No
No
Schannel Vista/2008, 7/2008R2, 8/2012, 8.1/2012R2, 10
No
No
No
No
No
No
No
No
No
No
No
No
No
No
Secure Transport
No
No
No
No
No
No
No
No
No
No
No
No
No
No
wolfSSL
No
No
No
No
No
No
No
No
No
No
No
No
No
No
Erlang /OTP SSL application
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Implementation
sect163k1NIST K-163 (1)
sect163r1 (2)
sect163r2NIST B-163 (3)
sect193r1 (4)
sect193r2 (5)
sect233k1NIST K-233 (6)
sect233r1NIST B-233 (7)
sect239k1 (8)
sect283k1NIST K-283 (9)
sect283r1NIST B-283 (10)
sect409k1NIST K-409 (11)
sect409r1NIST B-409 (12)
sect571k1NIST K-571 (13)
sect571r1NIST B-571 (14)
Notes
^ a b c d e f g h i j k l m n o p q r s t u v These elliptic curves were "Disabled by Default" in current JDK families as part of JDK-8236730.[ 183]
^ a b c d e f g h i j k l m n o p q r s t u v These elliptic curves were subsequently removed in JDK 16+ as part of JDK-8252601.[ 184]
Data integrity
Compression
Note the CRIME security exploit takes advantage of TLS compression, so conservative implementations do not enable compression at the TLS level. HTTP compression is unrelated and unaffected by this exploit, but is exploited by the related BREACH attack .
Extensions
In this section the extensions each implementation supports are listed. Note that the Secure Renegotiation extension is critical for HTTPS client security [citation needed ] . TLS clients not implementing it are vulnerable to attacks, irrespective of whether the client implements TLS renegotiation.
Assisted cryptography
This section lists the known ability of an implementation to take advantage of CPU instruction sets that optimize encryption, or utilize system specific devices that allow access to underlying cryptographic hardware for acceleration or for data separation.
^ Pure Java implementations relies on JVM processor optimization capabilities, such as OpenJDK support for AES-NI [ 228]
^ BSAFE SSL-J can be configured to run in native mode, using BSAFE Crypto-C Micro Edition to benefit from processor optimization.[ 229]
System-specific backends
This section lists the ability of an implementation to take advantage of the available operating system specific backends, or even the backends provided by another implementation.
Cryptographic module/token support
Code dependencies
Implementation
Dependencies
Optional dependencies
Botan
C++20
SQLite zlib (compression)bzip2 (compression)liblzma (compression)boost trousers (TPM)
GnuTLS
libc nettle gmp
zlib (compression) p11-kit (PKCS #11) trousers (TPM)libunbound (DANE)
JSSE
Java
MatrixSSL
none
zlib (compression)
MatrixSSL-open
libc or newlib
Mbed TLS
libc
libpkcs11-helper (PKCS #11) zlib (compression)
NSS
libc libnspr4 libsoftokn3 libplc4 libplds4
zlib (compression)
Rustls
rust core library
rust std library zlib-rs (compression) brotli (compression)ring (cryptography) aws-lc-rs (cryptography)
OpenSSL
libc
zlib (compression) brotli (compression) zstd (compression)
wolfSSL
None
libc zlib (compression)
Erlang /OTP SSL application
libcrypto (from OpenSSL), Erlang/OTP and its public_key, crypto and asn1 applications
Erlang/OTP -inets (http fetching of CRLs)
Implementation
Dependencies
Optional dependencies
Development environment
Implementation
Namespace
Build tools
API manual
Crypto back-end
OpenSSL compatibility Layer [clarify ]
Botan
Botan::TLS
Makefile
Sphinx
Included (pluggable)
No
Bouncy Castle
org.bouncycastle
Java Development Environment
Programmers reference manual (PDF)
Included (pluggable)
No
BSAFE SSL-J
com.rsa.asn1
com.rsa.certj
com.rsa.jcp
com.rsa.jsafe
com.rsa.ssl
com.rsa.jsse
Java class loader
Javadoc, Developer's guide (HTML)
Included
No
cryptlib
crypt*
makefile, MSVC project workspaces
Programmers reference manual (PDF), architecture design manual (PDF)
Included (monolithic)
No
GnuTLS
gnutls_*
Autoconf, automake, libtool
Manual and API reference (HTML, PDF)
External, libnettle
Yes (limited)
JSSE
javax.net.ssl
sun.security.ssl
Makefile
API Reference (HTML) +
JSSE Reference Guide
Java Cryptography Architecture ,Java Cryptography Extension
No
MatrixSSL
matrixSsl_*
ps*
Makefile, MSVC project workspaces, Xcode projects for OS X and iOS
API Reference (PDF), Integration Guide
Included (pluggable)
Yes (Subset: SSL_read, SSL_write, etc.)
Mbed TLS
mbedtls_ssl_*
mbedtls_sha1_*
mbedtls_md5_*
mbedtls_x509*
...
Makefile, CMake , MSVC project workspaces, yotta
API Reference + High Level and Module Level Documentation (HTML)
Included (monolithic)
No
NSS
CERT_*
SEC_*
SECKEY_*
NSS_*
PK11_*
SSL_*
...
Makefile
Manual (HTML)
Included, PKCS#11 based[ 263]
Yes (separate package called nss_compat_ossl[ 264] )
OpenSSL
SSL_*
SHA1_*
MD5_*
EVP_*
...
Makefile
Man pages
Included (monolithic)
—
Rustls
rustls::
cargo
API reference and design manual
Two options included (pluggable)
Yes[ 265] (subset)
wolfSSL
wolfSSL_*
CyaSSL_*
SSL_*
Autoconf, automake, libtool, MSVC project workspaces, XCode projects, CodeWarrior projects, MPLAB X projects, Keil, IAR, Clang, GCC, e2Studio
Manual and API Reference (HTML, PDF)
Included (monolithic)
Yes (about 60% of API)
Implementation
Namespace
Build tools
API manual
Crypto back-end
OpenSSL compatibility layer
Portability concerns
Implementation
Platform requirements
Network requirements
Thread safety
Random seed
Able to cross-compile
No OS (bare metal)
Supported operating systems
Botan
C++11
None
Thread-safe
Platform-dependent
Yes
Windows, Linux, macOS, Android, iOS, FreeBSD, OpenBSD, Solaris, AIX, HP-UX, QNX, BeOS, IncludeOS
BSAFE SSL-J
Java
Java SE network components
Thread-safe
Depends on java.security.SecureRandom
Yes
No
FreeBSD, Linux, macOS, Microsoft Windows, Android, AIX, Solaris
cryptlib
C89
POSIX send() and recv(). API to supply your own replacement
Thread-safe
Platform-dependent, including hardware sources
Yes
Yes
AMX, BeOS, ChorusOS, DOS, eCos, FreeRTOS/OpenRTOS, uItron, MVS, OS/2, Palm OS, QNX Neutrino, RTEMS, Tandem NonStop, ThreadX, uC/OS II, Unix (AIX, FreeBSD, HPUX, Linux, macOS, Solaris, etc.), VDK, VM/CMS, VxWorks, Win16, Win32, Win64, WinCE/PocketPC/etc, XMK
GnuTLS
C89
POSIX send() and recv(). API to supply your own replacement.
Thread-safe, needs custom mutex hooks if neither POSIX nor Windows threads are available.
Platform dependent
Yes
No
Generally any POSIX platforms or Windows, commonly tested platforms include Linux, Win32/64, macOS, Solaris, OpenWRT, FreeBSD, NetBSD, OpenBSD.
JSSE
Java
Java SE network components
Thread-safe
Depends on java.security.SecureRandom
Yes
Java based, platform-independent
MatrixSSL
C89
None
Thread-safe
Platform dependent
Yes
Yes
All
Mbed TLS
C89
POSIX read() and write(). API to supply your own replacement.
Threading layer available (POSIX or own hooks)
Random seed set through entropy pool
Yes
Yes
Known to work on: Win32/64, Linux, macOS, Solaris, FreeBSD, NetBSD, OpenBSD, OpenWRT, iPhone (iOS), Xbox, Android, eCos, SeggerOS, RISC OS
NSS
C89, NSPR[ 266]
NSPR[ 266] PR_Send() and PR_Recv(). API to supply your own replacement.
Thread-safe
Platform dependent[ 267]
Yes (but cumbersome)
No
AIX, Android, FreeBSD, NetBSD, OpenBSD, BeOS, HP-UX, IRIX, Linux, macOS, OS/2, Solaris, OpenVMS, Amiga DE, Windows, WinCE, Sony PlayStation
Rustls
Rust (programming language)
None
Thread-safe
Platform dependent
Yes
Yes
All supported by Rust (programming language)
OpenSSL
C89
None
Thread-safe
Platform dependent
Yes
No
Unix-like, DOS (with djgpp), Windows, OpenVMS, NetWare, eCos
wolfSSL
C89
POSIX send() and recv(). API to supply your own replacement.
Thread-safe
Random seed set through wolfCrypt
Yes
Yes
Win32/64, Linux, macOS, Solaris, ThreadX, VxWorks, FreeBSD, NetBSD, OpenBSD, embedded Linux, Yocto Project, OpenEmbedded, WinCE, Haiku, OpenWRT, iPhone (iOS), Android, Nintendo Wii and Gamecube through DevKitPro, QNX, MontaVista, NonStop, TRON/ITRON/μITRON, eCos, Micrium μC/OS-III, FreeRTOS, SafeRTOS, NXP/Freescale MQX, Nucleus, TinyOS, HP/UX, AIX, ARC MQX, Keil RTX, TI-RTOS, uTasker, embOS, INtime, Mbed, uT-Kernel, RIOT, CMSIS-RTOS, FROSTED, Green Hills INTEGRITY, TOPPERS, PetaLinux, Apache mynewt
Implementation
Platform requirements
Network requirements
Thread safety
Random seed
Able to cross-compile
No OS (bare metal)
Supported operating systems
See also
SCTP — with DTLS support
DCCP — with DTLS support
SRTP — with DTLS support (DTLS-SRTP) and Secure Real-Time Transport Control Protocol (SRTCP)
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^ a b c d e f RFC 4279 . doi :10.17487/RFC4279 .
^ a b RFC 5489 . doi :10.17487/RFC5489 .
^ a b RFC 2712 . doi :10.17487/RFC2712 .
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^ RFC 5280 . doi :10.17487/RFC5280 .
^ RFC 3280 . doi :10.17487/RFC3280 .
^ RFC 2560 . doi :10.17487/RFC2560 .
^ RFC 6698 . doi :10.17487/RFC6698 .
^ RFC 7218 . doi :10.17487/RFC7218 .
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^ a b
^ a b RFC 6655, RFC 7251
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^ a b RFC 5932 . doi :10.17487/RFC5932 .
^ a b c d RFC 6209 . doi :10.17487/RFC6209 .
^ a b RFC 4162 . doi :10.17487/RFC4162 .
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^ a b RFC 7905 . doi :10.17487/RFC7905 .
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^ RFC 5469
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^ "Version 1.11.15, 2015-03-08 — Botan" . 2015-03-08. Retrieved 2015-03-11 .
^ "Java Cryptography Architecture Oracle Providers Documentation" . docs.oracle.com .
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^ a b c d e RFC 8446
^ a b c d e RFC 8422
^ a b c RFC 7027
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^ "Bug 1597057 - Curve448 or named Ed448-Goldilocks support needed (both X448 key exchange and Ed448 signature algorithm )" . Mozilla. Retrieved 2022-08-04 .
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^ "wolfSSL Release 4.4.0 (04/22/2020)" . 2020-04-22. Retrieved 2022-10-18 .
^ "Release Note: Weak Named Curves in TLS, CertPath, and Signed JAR Disabled by Default" . JDK Bug System (JBS) . Retrieved 25 December 2024 .
^ "Release Note: Removal of Legacy Elliptic Curves" . JDK Bug System (JBS) . Retrieved 25 December 2024 .
^ a b Negotiation of arbitrary curves has been shown to be insecure for certain curve sizes Mavrogiannopoulos, Nikos and Vercautern, Frederik and Velichkov, Vesselin and Preneel, Bart (2012). "A cross-protocol attack on the TLS protocol" (PDF) . Proceedings of the 2012 ACM conference on Computer and communications security . Association for Computing Machinery. pp. 62– 72. doi :10.1145/2382196.2382206 . ISBN 978-1-4503-1651-4 . {{cite conference }}
: CS1 maint: multiple names: authors list (link )
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^ RFC 3749
^ RFC 5746
^ a b c RFC 6066
^ RFC 7301
^ RFC 6091
^ RFC 4680
^ RFC 5077 . doi :10.17487/RFC5077 .
^ RFC 5705 . doi :10.17487/RFC5705 .
^ RFC 7507 . doi :10.17487/RFC7507 .
^ RFC 7627
^ RFC 7685
^ RFC 7250
^ "Version 1.11.16, 2015-03-29 — Botan" . 2016-03-29. Retrieved 2016-09-08 .
^ "Version 1.11.10, 2014-12-10 — Botan" . 2014-12-10. Retrieved 2014-12-14 .
^ a b "Version 1.11.26, 2016-01-04 — Botan" . 2016-01-04. Retrieved 2016-02-25 .
^ Present, but disabled by default due to lack of use by any implementation.
^ "gnutls 3.2.0" . Archived from the original on 2016-01-31. Retrieved 2015-01-26 .
^ Mavrogiannopoulos, Nikos (August 21, 2017). "[gnutls-help] GnuTLS 3.6.0 released" .
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^ "%DUMBFW priority keyword" . Retrieved 2017-04-30 .
^ "gnutls 3.6.6" . 2019-01-25. Retrieved 2019-09-01 .
^ "LibreSSL 2.1.3 released" . 2015-01-22. Retrieved 2015-01-22 .
^ "LibreSSL 2.1.4 released" . 2015-03-04. Retrieved 2015-03-04 .
^ "MatrixSSL - News" . 2014-12-04. Archived from the original on 2015-02-14. Retrieved 2015-01-26 .
^ a b c "mbed TLS 1.3.10 released" . 2015-02-08. Archived from the original on 2015-02-09. Retrieved 2015-02-09 .
^ a b "NSS 3.15.5 release notes" . Mozilla Developer Network . Mozilla. Archived from the original on January 26, 2015. Retrieved 2015-01-26 .
^ "Bug 961416 - Support RFC6091 - Using OpenPGP Keys for Transport Layer Security Authentication (TLS1.2)" . Mozilla. Retrieved 2014-06-18 .
^ "Bug 972145 - Implement the encrypt-then-MAC TLS extension" . Mozilla. Retrieved 2014-11-06 .
^ "NSS 3.17.1 release notes" . Archived from the original on 2019-04-19. Retrieved 2014-10-17 .
^ "NSS 3.21 release notes" . Archived from the original on 2021-12-07. Retrieved 2015-11-14 .
^ "OpenSSL Security Advisory [15 Oct 2014]" . 2014-10-15.
^ "Major changes between OpenSSL 1.0.1f and OpenSSL 1.0.1g [7 Apr 2014]" . 2014-04-07. Archived from the original on 2015-01-20. Retrieved 2015-02-10 .
^ "OpenSSL Announces Final Release of OpenSSL 3.2.0" . 2023-11-23. Retrieved 2024-10-11 .
^ rustls does not implement earlier versions that would warrant protection against insecure downgrade
^ a b c d "Microsoft Security Bulletin MS15-121" . March 2023. Retrieved 2024-04-28 .
^ a b "What's New in TLS/SSL (Schannel SSP)" . 31 August 2016. Retrieved 2024-04-28 .
^ "wolfSSL Version 4.2.0 is Now Available!" . 22 October 2019. Retrieved 2021-08-13 .
^ "wolfSSL supports Raw Public Keys" . August 2023. Retrieved 2024-10-25 .
^ "Version 1.11.31, 2015-08-30 — Botan" . 2016-08-30. Retrieved 2016-09-08 .
^ "Trusted Platform Module (TPM) — Botan" .
^ "JEP 164: Leverage CPU Instructions for AES Cryptography" . openjdk.org .
^ "RSA SecurID PASSCODE Request" . sso.rsasecurity.com .
^ "Comparison of BSAFE TLS libraries: Micro Edition Suite vs SSL-J | Dell Malaysia" .
^ Mavrogiannopoulos, Nikos (October 9, 2016). "[gnutls-devel] gnutls 3.5.5" .
^ "Trusted Platform Module (GnuTLS 3.8.4)" .
^ "Java SSL provider with AES-NI support" . stackoverflow.com .
^ "PolarSSL 1.3.3 released" . 2013-12-31. Archived from the original on 2014-01-07. Retrieved 2014-01-07 . We've incorporated support for AES-NI in our AES and GCM modules.
^ "NXP/Plug-and-trust" . GitHub .
^ "ARMmbed/Mbed-os-atecc608a" . GitHub .
^ Normally NSS's libssl performs all operations via the PKCS#11 interface, either to hardware or software tokens
^ "Bug 706024 - AES-NI enhancements to NSS on Sandy Bridge systems" . Retrieved 2013-09-28 .
^ "Bug 479744 - RFE : VIA Padlock ACE support (hardware RNG, AES, SHA1 and SHA256)" . Retrieved 2014-04-11 .
^ "Подключаем Рутокен ЭЦП к OpenSSL" (in Russian). 16 December 2011.
^ "Поддержка Рутокен ЭЦП в OpenSSL (Страница 1) — Рутокен и Open Source — Форум Рутокен" (in Russian).
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^ "WolfSSL support for the ATECC608 Crypto Coprocessor – wolfSSL" . 13 October 2021.
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^ On the fly replaceable/augmentable.
^ "Nss compat ossl - Fedora Project Wiki" . fedoraproject.org .
^ "rustls-openssl compatibility layer" . GitHub . Retrieved 2024-08-29 .
^ a b "NSPR" . Mozilla Developer Network .
^ For Unix/Linux it uses /dev/urandom if available, for Windows it uses CAPI. For other platforms it gets data from clock, and tries to open system files. NSS has a set of platform dependent functions it uses to determine randomness.
Protocols and technologies Public-key infrastructure See also History Implementations Notaries Vulnerabilities
Theory Cipher Protocol Implementation