Comparison of TLS implementations

The Transport Layer Security (TLS) protocol provides the ability to secure communications across 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.

This article is about TLS libraries comparison. For cryptographic libraries comparison, see Comparison of cryptography libraries.

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++ 2.16.0 (October 6, 2020 (2020-10-06)[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#
Java1.68 / December 21, 2020 (2020-12-21)[2]
Java FIPSBC-FJA 1.0.2 / August 24, 2019 (2019-08-24)[3]
C#1.8.9 / December 9, 2020 (2020-12-09)[4]
C# FIPSBC-FNA 1.0.1 / December 28, 2016 (2016-12-28)[5]
 Australia
BSAFE Dell, formerly RSA Security No Proprietary Dell Java, C, assembly SSL-J 6.2.7 (June 28, 2020 (2020-06-28)) [±]

Micro Edition Suite 4.6 (December 17, 2020 (2020-12-17)[6]) [±]

Australia
cryptlib Peter Gutmann Yes Sleepycat License and commercial license Peter Gutmann C 3.4.5 (2019 (2019)[7]) [±] NZ
GnuTLS GnuTLS project Yes GNU LGPLv2.1+ Free Software Foundation C 3.6.14 (June 3, 2020 (2020-06-03)[8]) [±] EU (Greece and Sweden)
Java Secure Socket Extension (JSSE) Oracle Yes GNU GPLv2 and commercial license Oracle Java 15.0.2 (December 10, 2020 (2020-12-10)[9]) [±]

11.0.10 (January 19, 2021 (2021-01-19)[10]) [±]
8u282 (December 29, 2020 (2020-12-29)[11]) [±]

 US
LibreSSL OpenBSD Project Yes Apache License 1.0, 4-clause BSD License, ISC License, and some are public domain Eric Young, Tim Hudson, Sun, OpenSSL project, OpenBSD Project, and others C, assembly 3.2.3 (8 December 2020 (2020-12-08)[12][13]) [±] Canada
MatrixSSL[14] PeerSec Networks Yes GNU GPLv2+ and commercial license PeerSec Networks C 4.2.2 (September 11, 2019 (2019-09-11) [15]) [±] US
Mbed TLS (previously PolarSSL) Arm Yes Apache License 2.0, GNU GPLv2+ and commercial license Arm Holdings C 2.25.0 (December 11, 2020 (2020-12-11)[16]) [±] EU (Netherlands)
Network Security Services (NSS) Mozilla, AOL, Red Hat, Sun, Oracle, Google and others Yes MPL 2.0 NSS contributors C, assembly
Standard3.61 / January 22, 2021 (2021-01-22)[17]
Extended Support Release3.53.1 / June 16, 2020 (2020-06-16)[17]
 US
OpenSSL OpenSSL project Yes OpenSSL-SSLeay dual-license Eric Young, Tim Hudson, Sun, OpenSSL project, and others C, assembly 1.1.1i (December 8, 2020 (2020-12-08)[18]) [±] Australia/EU
S2n Amazon Yes Apache License 2.0, GNU GPLv2+ and commercial license Amazon, Inc. C Continuous US
SChannel Microsoft No Proprietary Microsoft Inc. Windows 10, 2015-07-29 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[19] Yes GNU GPLv2+ and commercial license wolfSSL Inc.[20] C 4.6.0 (December 22, 2020 (2020-12-22)[21]) [±] 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

Protocol support

Several versions of the TLS protocol exist. SSL 2.0 is a deprecated[22] 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.[23] 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.[24] 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,[25] so from a security perspective, all existing version of TLS 1.0, 1.1 and 1.2 provide equivalent strength in the base protocol and are suitable for 128-bit security according to NIST SP800-57 up to at least 2030. In 2014, the POODLE vulnerability of SSL 3.0 was discovered, which takes advantage the known vulnerabilities in CBC, and an insecure fallback negotiation used in browsers.[26]

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).[27]

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.[28]

Note that there are known vulnerabilities in SSL 2.0 and SSL 3.0. With the exception of the predictable IVs (for which an easy workaround exists) all currently known vulnerabilities affect all version of TLS 1.0/1.1/1.2 alike.[29]

Implementation SSL 2.0 (insecure)[30] SSL 3.0 (insecure)[31] TLS 1.0[32] TLS 1.1[33] TLS 1.2[34] TLS 1.3 DTLS 1.0[35] DTLS 1.2[28]
Botan No No[36] Yes Yes Yes Yes Yes
BoringSSL Yes Yes Yes Yes Yes Yes
Bouncy Castle No No Yes Yes Yes Yes
(draft version)		 Yes Yes
BSAFE[37] No Disabled by default Yes Yes Yes No No No
cryptlib No Disabled by default at compile time Yes Yes Yes No No
GnuTLS No[a] Disabled by default[38] Yes Yes Yes Yes[39] Yes Yes
JSSE No[a] Disabled by default[40] Yes Yes Yes Yes
(JDK 11+)[41]		 Yes Yes
LibreSSL No[42] No[43] Yes Yes Yes Yes Yes No
MatrixSSL No Disabled by default at compile time[44] Yes Yes Yes Yes Yes Yes
Mbed TLS No Disabled by default[45] Yes Yes Yes No Yes[45] Yes[45]
NSS No[b] Disabled by default[46] Yes Yes[47] Yes[48] Yes[49] Yes[47] Yes[50]
OpenSSL No[51] Disabled by default Yes Yes[52] Yes[52] Yes Yes Yes[53]
S2n[54] No Disabled by default Yes Yes Yes No No
SChannel XP, 2003[55] Disabled by default in MSIE 7 Enabled by default Enabled by default in MSIE 7 No No No No
SChannel Vista[56] Disabled by default Enabled by default Yes No No No No
SChannel 2008[56] Disabled by default Enabled by default Yes Disabled by default (KB4019276) Disabled by default (KB4019276) No No
SChannel 7, 2008R2[57] Disabled by default Disabled by default in MSIE 11 Yes Enabled by default in MSIE 11 Enabled by default in MSIE 11 Yes[58] No[58]
SChannel 8, 2012[57] Disabled by default Enabled by default Yes Disabled by default Disabled by default Yes No
SChannel 8.1, 2012R2, 10 v1507 & v1511[57] Disabled by default Disabled by default in MSIE 11 Yes Yes Yes Yes No
SChannel 10 v1607 / 2016[59] No Disabled by default Yes Yes Yes Yes Yes
Secure Transport

OS X 10.2-10.7, iOS 1-4

 Yes Yes Yes No No No No
Secure Transport OS X 10.8-10.10, iOS 5-8 No[c] Yes Yes Yes[c] Yes[c] Yes[c] No
Secure Transport OS X 10.11, iOS 9 No No[c] Yes Yes Yes Yes Un­known
Secure Transport OS X 10.13, iOS 11 No No[c] Yes Yes Yes Yes
(draft version)[60]		 Yes Un­known
wolfSSL No Disabled by default[61] Yes Yes Yes Yes Yes Yes
Erlang/OTP SSL application No Disabled by default Yes Yes Yes Not yet Yes Yes
Implementation SSL 2.0 (insecure)[30] SSL 3.0 (insecure)[31] TLS 1.0[32] TLS 1.1[33] TLS 1.2[34] TLS 1.3 DTLS 1.0[35] DTLS 1.2[28]
  1. ^
    SSL 2.0 client hello is supported even though SSL 2.0 is not supported or is disabled because of the backward compatibilities.
  2. ^
    Server-side implementation of the SSL/TLS protocol still supports processing of received v2-compatible client hello messages.[62]
  3. ^
    Secure Transport: SSL 2.0 was discontinued in OS X 10.8. SSL 3.0 was discontinued in OS X 10.11 and iOS 9.TLS 1.1, 1.2 and DTLS are available on iOS 5.0 and later, and OS X 10.9 and later.[63]
    4. [64]

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.

Implementation TLS 1.2 Suite B
Botan Yes
Bouncy Castle Yes
BSAFE Yes[37]
cryptlib Yes
GnuTLS Yes
JSSE Yes[65]
LibreSSL Yes
MatrixSSL Yes
Mbed TLS Yes
NSS No[66]
OpenSSL Yes[53]
S2n
SChannel Yes[67]
Secure Transport No
wolfSSL Yes
Implementation TLS 1.2 Suite B

Certifications

Note that certain certifications have received serious negative criticism from people who are actually involved in them.[68]

Implementation FIPS 140-1, FIPS 140-2[69] Common Criteria Embedded FIPS Solution
Level 1 Level 2
Botan[70]
Bouncy Castle BC-FJA 1.0.0 (#2768)
BC-FJA 1.0.1 (#3152)
BSAFE Micro-Edition Suite[71] Crypto-C ME 3.0.0.1 (#1092)
Crypto-C ME 4.0.1 / 4.0.2.5 (#2047, #2056, #2097, #2217)
Crypto-C ME 4.1 / 4.1.0.1 / 4.1.2 / 4.1.3.2 (#2294, #2300)
Crypto-C ME 4.1.4 (#3743)
BSAFE SSL-J[72] 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)
cryptlib[73]
GnuTLS[74] Red Hat Enterprise Linux GnuTLS Cryptographic Module (#2780)
JSSE
LibreSSL[42] no support
MatrixSSL[75] SafeZone FIPS Cryptographic Module: 1.1 (#2389)
Mbed TLS[76]
NSS[77] 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[78] 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)
SChannel[79] 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[80] 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
 Yes
Implementation Level 1 Level 2 Common Criteria Embedded FIPS Solution
FIPS 140-1, FIPS 140-2
  1. with Sun Sparc 5 w/ Sun Solaris v 2.4SE (ITSEC-rated)
  2. with Sun Ultra-5 w/ Sun Trusted Solaris version 2.5.1 (ITSEC-rated)
  3. with Solaris v8.0 with AdminSuite 3.0.1 as specified in UK IT SEC CC Report No. P148 EAL4 on a SUN SPARC Ultra-1
  4. with these platforms; Red Hat Enterprise Linux Version 4 Update 1 AS on IBM xSeries 336 with Intel Xeon CPU, Trusted Solaris 8 4/01 on Sun Blade 2500 Workstation with UltraSPARC IIIi CPU
  5. with these platforms; Red Hat Enterprise Linux v5 running on an IBM System x3550, Red Hat Enterprise Linux v5 running on an HP ProLiant DL145, Sun Solaris 10 5/08 running on a Sun SunBlade 2000 workstation, Sun Solaris 10 5/08 running on a Sun W2100z workstation

Key exchange algorithms (certificate-only)

This section lists the certificate verification functionality available in the various implementations.

Implementation RSA[34] RSA-EXPORT (insecure)[34] DHE-RSA (forward secrecy)[34] DHE-DSS (forward secrecy)[34] ECDH-ECDSA[81] ECDHE-ECDSA (forward secrecy)[81] ECDH-RSA[81] ECDHE-RSA (forward secrecy)[81] GOST R 34.10-94, 34.10-2001[82]
Botan Disabled by default No Yes Disabled by default No Yes No Yes No
BSAFE Yes No Yes Yes Yes Yes Yes Yes No
cryptlib Yes No Yes Yes No Yes No No No
GnuTLS Yes No Yes Disabled by default[38] No Yes No Yes No
JSSE Yes Disabled by default Yes Yes Yes Yes Yes Yes No[83]
LibreSSL Yes No[42] Yes Yes Yes Yes Yes Yes Yes[84]
MatrixSSL Yes No Yes No Yes Yes Yes Yes No
Mbed TLS Yes No Yes No Yes Yes Yes Yes No
NSS Yes Disabled by default Yes[85] Yes Yes Yes Yes Yes No[86][87]
OpenSSL Yes No[51] Yes Disabled by default[51] Yes Yes Yes Yes Yes[88]
SChannel XP/2003 Yes Yes No XP: Max 1024 bits
2003: 1024 bits only		 No No No No No[89]
SChannel Vista/2008 Yes Disabled by default No 1024 bits by default[90] No Yes No except AES_GCM No[89]
SChannel 8/2012 Yes Disabled by default AES_GCM only[91][92][93] 1024 bits by default[90] No Yes No except AES_GCM No[89]
SChannel 7/2008R2, 8.1/2012R2 Yes Disabled by default Yes 2048 bits by default[90] No Yes No except AES_GCM No[89]
SChannel 10 Yes Disabled by default Yes 2048 bits by default[90] No Yes No Yes No[89]
Secure Transport OS X 10.6 Yes Yes except AES_GCM Yes Yes except AES_GCM yes except AES_GCM No
Secure Transport OS X 10.8-10.10 Yes No except AES_GCM No Yes except AES_GCM Yes except AES_GCM No
Secure Transport OS X 10.11 Yes No Yes No No Yes No Yes No
wolfSSL Yes No Yes No Yes Yes Yes Yes No
Erlang/OTP SSL application Yes No Yes Yes Yes Yes Yes Yes No
Implementation RSA[34] RSA-EXPORT (insecure)[34] DHE-RSA (forward secrecy)[34] DHE-DSS (forward secrecy)[34] ECDH-ECDSA[81] ECDHE-ECDSA (forward secrecy)[81] ECDH-RSA[81] ECDHE-RSA (forward secrecy)[81] GOST R 34.10-94, 34.10-2001[82]

Key exchange algorithms (alternative key-exchanges)
Implementation SRP[94] SRP-DSS[94] SRP-RSA[94] PSK-RSA[95] PSK[95] DHE-PSK (forward secrecy)[95] ECDHE-PSK (forward secrecy)[96] KRB5[97] DH-ANON[34] (insecure) ECDH-ANON[81] (insecure)
Botan Yes Yes Yes No Yes Yes Yes No Disabled by default Disabled by default
BSAFE Micro Edition Suite No No No No No No No No Disabled by default Disabled by default
BSAFE SSL-J No No No No Yes[98] No No No Disabled by default Disabled by default
cryptlib No No No No Yes Yes No Un­known No No
GnuTLS Yes Yes Yes Yes Yes Yes Yes No Disabled by default Disabled by default
JSSE No No No No No No No Un­known Disabled by default in Java 8 Disabled by default in Java 8
LibreSSL No[99] No[99] No[99] No No No No No Yes Yes
MatrixSSL No No No Yes Yes Yes No No Disabled by default No
Mbed TLS No No No Yes Yes Yes Yes No No No
NSS No[100] No[100] No[100] No[101] No[101] No[101] No[101] No Client side only, disabled by default[102] Disabled by default[103]
OpenSSL Yes Yes Yes Yes Yes Yes Yes Yes[104] Disabled by default[105] Disabled by default[105]
SChannel No No No No No No No Yes No No
Secure Transport No No No No No No No Un­known Yes Yes
wolfSSL No No No No Yes No Yes[106] No No No
Erlang/OTP SSL application Disabled by default Disabled by default Disabled by default Disabled by default Disabled by default Disabled by default No No Disabled by default Disabled by default
Implementation SRP[94] SRP-DSS[94] SRP-RSA[94] PSK-RSA[95] PSK[95] DHE-PSK (forward secrecy)[95] ECDHE-PSK (forward secrecy)[96] KRB5[97] DH-ANON[34] (insecure) ECDH-ANON[81] (insecure)

Certificate verification methods
Implementation Application-defined PKIX path validation[107] CRL[108] OCSP[109] DANE (DNSSEC)[110] Trust on First Use (TOFU) CT[111]
Botan Yes Yes Yes Yes No No Un­known
Bouncy Castle Yes Yes Yes Yes Yes No Un­known
BSAFE Yes Yes Yes Yes No No Un­known
cryptlib Yes Yes Yes Yes No No Un­known
GnuTLS Yes Yes Yes Yes Yes Yes Un­known
JSSE Yes Yes Yes Yes No No Un­known
LibreSSL Yes Yes Yes Yes No No Un­known
MatrixSSL Yes Yes Yes Yes[112] No No Un­known
Mbed TLS Yes Yes Yes No[113] No No Un­known
NSS Yes Yes Yes Yes No[114] No Un­known
OpenSSL Yes Yes Yes Yes Yes No Yes
SChannel Un­known Yes Yes[115] Yes[115] No No Un­known
Secure Transport Yes Yes Yes Yes No No Un­known
wolfSSL Yes Yes Yes Yes No No Un­known
Erlang/OTP SSL application Yes Yes Yes No No No Un­known
Implementation Application-defined PKIX path validation CRL OCSP DANE (DNSSEC) Trust on First Use (TOFU) CT

Encryption algorithms
ImplementationBlock cipher with mode of operationStream cipherNone
AES GCM
[116]		 AES CCM
[117]		 AES CBC Camellia GCM
[118]		 Camellia CBC
[119]		 ARIA GCM
[120]		 ARIA CBC
[120]		 SEED CBC
[121]		 3DES EDE CBC
(insecure)[122]		 GOST 28147-89 CNT
(proposed)
[82][n 1]		 ChaCha20-Poly1305
[123]		 Null
(insecure)
[n 2]
Botan Yes Yes Yes Yes Yes No No Disabled by default Disabled by default No Yes[124] Not implemented
BoringSSL Yes No Yes No No No No No Yes No Yes
BSAFE Micro-Edition Suite Yes Yes Yes No No No Yes Yes Lowest priority No No Disabled by default
BSAFE SSL-J Yes Yes Yes No No No No No Disabled by default No No Disabled by default
cryptlib Yes No Yes No No No No No Yes No No Not implemented
GnuTLS Yes Yes[38] Yes Yes Yes No No No Disabled by default[125] No Yes[126] Disabled by default
JSSE Yes No Yes No No No No No Disabled by default[127] No[83] Yes
(JDK 12+)[128]		 Disabled by default
LibreSSL Yes[42] No Yes No Yes[84] No No No[42] Yes Yes[84] Yes[42] Disabled by default
MatrixSSL Yes No Yes No No No No Yes Disabled by default No Yes[129] Disabled by default
Mbed TLS Yes Yes [130] Yes Yes Yes Yes[131] Yes[131] No Yes No Yes[132] Disabled by default at compile time
NSS Yes[133] No Yes No[134][n 3] Yes[135] No No Yes[136] Yes No[86][87] Yes[137] Disabled by default
OpenSSL Yes[138] Disabled by default[51] Yes No Disabled by default[51] Disabled by default[139] No Disabled by default[51] Disabled by default[51] Yes[88] Yes[51] Disabled by default
SChannel XP/2003 No No 2003 only[140] No No No No No Yes No[89] No Disabled by default
SChannel Vista/2008, 2008R2, 2012 No No Yes No No No No No Yes No[89] No Disabled by default
SChannel 7, 8, 8.1/2012R2 Yes except ECDHE_RSA
[91][92]		 No Yes No No No No No Yes No[89] No Disabled by default
Schannel 10[141] Yes No Yes No No No No No Yes No[89] No Disabled by default
Secure Transport OS X 10.6 - 10.10 No No Yes No No No No No Yes No No Disabled by default
Secure Transport OS X 10.11 Yes No Yes No No No No No Yes No No Disabled by default
wolfSSL Yes Yes Yes No Yes No No No Yes No Yes Disabled by default
Erlang/OTP SSL application Yes No Yes No No No No No Disabled by default No Experimental Disable by default
ImplementationBlock cipher with mode of operationStream cipherNone
AES GCM
[116]		 AES CCM
[117]		 AES CBC Camellia GCM
[118]		 Camellia CBC
[119]		 ARIA GCM
[120]		 ARIA CBC
[120]		 SEED CBC
[121]		 3DES EDE CBC
(insecure)[122]		 GOST 28147-89 CNT
(proposed)
[82][n 1]		 ChaCha20-Poly1305
[123]		 Null
(insecure)
[n 2]
Notes
  1. This algorithm is not defined yet as TLS cipher suites in RFCs, is proposed in drafts.
  2. authentication only, no encryption
  3. This algorithm is implemented in an NSS fork used by Pale Moon.

Obsolete algorithms
ImplementationBlock cipher with mode of operationStream cipher
IDEA CBC
[n 1](insecure)[143]		 DES CBC
(insecure)
[n 1]		 DES-40 CBC
(EXPORT, insecure)
[n 2]		 RC2-40 CBC
(EXPORT, insecure)
[n 2]		 RC4-128
(insecure)
[n 3]		 RC4-40
(EXPORT, insecure)
[n 4][n 2]
Botan No No No No No[144] No
BoringSSL No No No No Disabled by default at compile time No
BSAFE Micro-Edition Suite No No No No Disabled by default No
BSAFE SSL-J No Disabled by default Disabled by default No Disabled by default Disabled by default
cryptlib No Disabled by default at compile time No No Disabled by default at compile time No
GnuTLS No No No No Disabled by default[38] No
JSSE No Disabled by default Disabled by default No Disabled by default Disabled by default [145]
LibreSSL Yes Yes No[42] No[42] Yes No[42]
MatrixSSL Yes No No No Disabled by default No
Mbed TLS No Disabled by default at compile time No No Disabled by default at compile time[45] No
NSS Yes Disabled by default Disabled by default Disabled by default Lowest priority[146][147] Disabled by default
OpenSSL Disabled by default[51] Disabled by default No[51] No[51] Disabled by default No[51]
SChannel XP/2003 No Yes Yes Yes Yes Yes
SChannel Vista/2008 No Disabled by default Disabled by default Disabled by default Yes Disabled by default
SChannel 7/2008R2 No Disabled by default Disabled by default Disabled by default Lowest priority
will be disabled soon[148]		 Disabled by default
SChannel 8/2012 No Disabled by default Disabled by default Disabled by default Only as fallback Disabled by default
SChannel 8.1/2012R2 No Disabled by default Disabled by default Disabled by default Disabled by default[148] Disabled by default
Schannel 10[141] No Disabled by default Disabled by default Disabled by default Disabled by default[148] Disabled by default
Secure Transport OS X 10.6 Yes Yes Yes Yes Yes Yes
Secure Transport OS X 10.7 Yes Un­known Un­known Un­known Yes Un­known
Secure Transport OS X 10.8-10.9 Yes Disabled by default Disabled by default Disabled by default Yes Disabled by default
Secure Transport OS X 10.10-10.11 Yes Disabled by default Disabled by default Disabled by default Lowest priority Disabled by default
Secure Transport macOS 10.12 Yes Disabled by default Disabled by default Disabled by default Disabled by default Disabled by default
wolfSSL Disabled by default[149] No No No Disabled by default No
Erlang/OTP SSL application no Disabled by default no no Disabled by default no
ImplementationBlock cipher with mode of operationStream cipher
IDEA CBC
[n 1](insecure)[143]		 DES CBC
(insecure)
[n 1]		 DES-40 CBC
(EXPORT, insecure)
[n 2]		 RC2-40 CBC
(EXPORT, insecure)
[n 2]		 RC4-128
(insecure)
[n 3]		 RC4-40
(EXPORT, insecure)
[n 4][n 2]
Notes
  1. IDEA and DES have been removed from TLS 1.2.[142]
  2. 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.
  3. The RC4 attacks weaken or break RC4 used in SSL/TLS. Use of RC4 is prohibited by RFC 7465.
  4. The RC4 attacks weaken or break RC4 used in SSL/TLS.

Supported elliptic curves

This section lists the supported elliptic curves by each implementation.

Implementation sect163k1
NIST K-163
(1)[81]		 sect163r1
(2)[81]		 sect163r2
NIST B-163
(3)[81]		 sect193r1
(4)[81]		 sect193r2
(5)[81]		 sect233k1
NIST K-233
(6)[81]		 sect233r1
NIST B-233
(7)[81]		 sect239k1
(8)[81]		 sect283k1
NIST K-283
(9)[81]		 sect283r1
NIST B-283
(10)[81]		 sect409k1
NIST K-409
(11)[81]		 sect409r1
NIST B-409
(12)[81]		 sect571k1
NIST K-571
(13)[81]		 sect571r1
NIST B-571
(14)[81]
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 Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
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
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 sect163k1
NIST K-163
(1)		 sect163r1
(2)		 sect163r2
NIST B-163
(3)		 sect193r1
(4)		 sect193r2
(5)		 sect233k1
NIST K-233
(6)		 sect233r1
NIST B-233
(7)		 sect239k1
(8)		 sect283k1
NIST K-283
(9)		 sect283r1
NIST B-283
(10)		 sect409k1
NIST K-409
(11)		 sect409r1
NIST B-409
(12)		 sect571k1
NIST K-571
(13)		 sect571r1
NIST B-571
(14)
Implementation secp160k1
(15)[81]		 secp160r1
(16)[81]		 secp160r2
(17)[81]		 secp192k1
(18)[81]		 secp192r1
prime192v1
NIST P-192
(19)[81]		 secp224k1
(20)[81]		 secp224r1
NIST P-244
(21)[81]		 secp256k1
(22)[81]		 secp256r1
prime256v1
NIST P-256
(23)[81]		 secp384r1
NIST P-384
(24)[81]		 secp521r1
NIST P-521
(25)[81]		 arbitrary prime curves
(0xFF01)[81][150]		 arbitrary char2 curves
(0xFF02)[81][150]
Botan No No No No No No No No Yes Yes Yes No No
BoringSSL No No No No No No Yes No Yes Yes Yes (disabled by default) No No
BSAFE No No No No Yes No Yes No Yes Yes Yes No No
GnuTLS No No No No Yes No Yes No Yes Yes Yes No No
JSSE Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes No No
LibreSSL Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes No No
MatrixSSL No No No No Yes No Yes No Yes Yes Yes No No
Mbed TLS No No No Yes Yes Yes Yes Yes Yes Yes Yes No No
NSS Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes No No
OpenSSL Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes No No
SChannel Vista/2008, 7/2008R2, 8/2012, 8.1/2012R2, 10 No No No No No No No No Yes Yes Yes No No
Secure Transport No No No No Yes No No No Yes Yes Yes No No
wolfSSL Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes No No
Erlang/OTP SSL application Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes No No
Implementation secp160k1
(15)		 secp160r1
(16)		 secp160r2
(17)		 secp192k1
(18)		 secp192r1
prime192v1
NIST P-192
(19)		 secp224k1
(20)		 secp224r1
NIST P-244
(21)		 secp256k1
(22)		 secp256r1
prime256v1
NIST P-256
(23)		 secp384r1
NIST P-384
(24)		 secp521r1
NIST P-521
(25)		 arbitrary prime curves
(0xFF01)		 arbitrary char2 curves
(0xFF02)
Implementation brainpoolP256r1
(26)[151]		 brainpoolP384r1
(27)[151]		 brainpoolP512r1
(28)[151]		 X25519
[152]		 Curve448
Ed448-Goldilocks
[153]		 M221
Curve2213
[154]		 E222
[154]		 Curve1174
[154]		 E382
[154]		 M383
[154]		 Curve383187
[154]		 Curve41417
Curve3617
[154]		 M511
Curve511187
[154]		 E521
[154]
Botan Yes[155] Yes[155] Yes[155] Yes[124] No No No No No No No No No No
BoringSSL No No No Yes No No No No No No No No No No
BSAFE No No No No No No No No No No No No No No
GnuTLS No No No Yes[156] No No No No No No No No No No
JSSE No No No Yes
(JDK 13+)[157]		 No No No No No No No No No No
LibreSSL Yes[42] Yes[42] Yes[42] Yes[158] No No No No No No No No No No
MatrixSSL Yes Yes Yes TLS 1.3 only[159] No No No No No No No No No No
Mbed TLS Yes[160] Yes[160] Yes[160] Primitive only[161] Primitive only[162] No No No No No No No No No
NSS No[163] No[163] No[163] Yes[164] No No No No No No No No No No
OpenSSL Yes[53] Yes[53] Yes[53] Yes[165][166] Yes[167][168] 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 Yes Yes Yes Yes[169] No No No No No No No No No No
Erlang/OTP SSL application Yes Yes Yes No No No No No No No No No No No
Implementation brainpoolP256r1
(26)		 brainpoolP384r1
(27)		 brainpoolP512r1
(28)		 Curve25519 Curve448
Ed448-Goldilocks		 M221
Curve2213		 E222 Curve1174 E382 M383 Curve383187 Curve41417
Curve3617		 M511
Curve511187		 E521

Data integrity
Implementation HMAC-MD5 HMAC-SHA1 HMAC-SHA256/384 AEAD GOST 28147-89 IMIT[82] GOST R 34.11-94[82]
Botan No Yes Yes Yes No No
BSAFE Yes Yes Yes Yes No No
cryptlib Yes Yes Yes Yes No No
GnuTLS Yes Yes Yes Yes No No
JSSE Yes Yes Yes Yes No[83] No[83]
LibreSSL Yes Yes Yes Yes Yes[84] Yes[84]
MatrixSSL Yes Yes Yes Yes No No
Mbed TLS Yes Yes Yes Yes No No
NSS Yes Yes Yes Yes No[86][87] No[86][87]
OpenSSL Yes Yes Yes Yes Yes[88] Yes[88]
SChannel XP/2003, Vista/2008 Yes Yes XP SP3, 2003 SP2 via hotfix[170] No No[89] No[89]
SChannel 7/2008R2, 8/2012, 8.1/2012R2 Yes Yes Yes except ECDHE_RSA[91][92][93] No[89] No[89]
SChannel 10 Yes Yes Yes Yes[141] No[89] No[89]
Secure Transport Yes Yes Yes Yes No No
wolfSSL Yes Yes Yes Yes No No
Erlang/OTP SSL application Yes Yes Yes Yes No No
Implementation HMAC-MD5 HMAC-SHA1 HMAC-SHA256/384 AEAD GOST 28147-89 IMIT GOST R 34.11-94

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.

Implementation DEFLATE[171]
(insecure)
Botan No
BSAFE[37] No
cryptlib No
GnuTLS Disabled by default
JSSE No
LibreSSL No[42]
MatrixSSL Disabled by default
Mbed TLS Disabled by default
NSS Disabled by default
OpenSSL Disabled by default
SChannel No
Secure Transport No
wolfSSL Disabled by default
Erlang/OTP SSL application No
Implementation DEFLATE

Extensions

In this section the extensions each implementation supports are listed. Note that the Secure Renegotiation extension is critical for HTTPS client security . TLS clients not implementing it are vulnerable to attacks, irrespective of whether the client implements TLS renegotiation.

Implementation Secure Renegotiation
[172]		 Server Name Indication
[173]		 ALPN
[174]		 Certificate Status Request
[173]		 OpenPGP
[175]		 Supplemental Data
[176]		 Session Ticket
[177]		 Keying Material Exporter
[178]		 Maximum Fragment Length
[173]		 Truncated HMAC
[173]		 Encrypt-then-MAC
[179]		 TLS Fallback SCSV
[180]		 Extended Master Secret
[181]		 ClientHello Padding
[182]		 Raw Public Keys
[183]
Botan Yes Yes Yes[184] No No No Yes Yes Yes No Yes Yes[185] Yes[186] No Un­known
BSAFE Micro-Edition Suite Yes Yes No Yes No No Yes No Yes Yes No No No No No
BSAFE SSL-J Yes Yes No No No No No No Yes Yes No No No No No
cryptlib Yes Yes No No No Yes No No No[187] No Yes Yes Yes No Un­known
GnuTLS Yes Yes Yes[188] Yes No[189] Yes Yes Yes Yes No Yes[38] Yes[190] Yes[38] Yes[191] Yes[192]
JSSE Yes Yes[65] Yes[65] Yes No No Yes No Yes No No No Yes No No
LibreSSL Yes Yes Yes[193] Yes No No? Yes Yes? No No No Server side only[194] No Yes No
MatrixSSL Yes Yes Yes[195] Yes[129] No No Yes No Yes Yes No Yes[129] Yes[129] No Un­known
Mbed TLS Yes Yes Yes[196] No No No Yes No Yes Disabled by default[45] Yes[197] Yes[197] Yes[197] No No
NSS Yes Yes Yes[198] Yes No[199] No Yes Yes No No No[200] Yes[201] Yes[202] Yes[198] Un­known
OpenSSL Yes Yes Yes[53] Yes No No? Yes Yes Yes No Yes Yes[203] Yes[204] Yes[205] No
SChannel XP/2003 No No No No No Yes No No No No No No No No Un­known
SChannel Vista/2008 Yes Yes No No No Yes No No No No No No Yes[206] No Un­known
SChannel 7/2008R2 Yes Yes No Yes No Yes No No No No No No Yes[206] No Un­known
SChannel 8/2012 Yes Yes No Yes No Yes Client side only[207] No No No No No Yes[206] No Un­known
SChannel 8.1/2012R2, 10 Yes Yes Yes Yes No Yes Yes[207] No No No No No Yes[206] No Un­known
Secure Transport Yes Yes Un­known No No Yes No No No No No No No No Un­known
wolfSSL Yes Yes Yes[149] Yes No No Yes No Yes Yes No No Yes No Un­known
Erlang/OTP SSL application Yes Yes Yes No No No No No No No No Yes No No Un­known
Implementation Secure Renegotiation Server Name Indication ALPN Certificate Status Request OpenPGP Supplemental Data Session Ticket Keying Material Exporter Maximum Fragment Length Truncated HMAC Encrypt-then-MAC TLS Fallback SCSV Extended Master Secret ClientHello Padding Raw Public Keys

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.

Implementation PKCS #11 device Intel AES-NI VIA PadLock ARMv8-A Intel SGX Intel QAT Intel SHA
Botan Yes[208] Yes No Yes No No
BSAFE Micro Edition Suite Yes Yes No Yes No No Yes
BSAFE SSL-J [lower-alpha 1][lower-alpha 2] Yes Yes No Yes No No Yes
cryptlib Yes Yes Yes No No
Crypto++ Yes No Yes
GnuTLS Yes Yes Yes Yes[211] No No
JSSE Yes Yes[212] No No No
LibreSSL No Yes Yes No No
MatrixSSL Yes Yes No Yes No
Mbed TLS Yes Yes[213] Yes No No
NSS Yes[214] Yes[215] No[216] No No
OpenSSL Yes[217] Yes Yes Yes[218] No Yes
SChannel No Yes No No No
Secure Transport No Yes[219][220] No Yes No
wolfSSL Yes Yes No Yes Yes Yes[221]
Implementation PKCS #11 device Intel AES-NI VIA PadLock ARMv8-A Intel SGX Intel QAT Intel SHA
  1. Pure Java implementations relies on JVM processor optimization capabilities, such as OpenJDK support for AES-NI[209]
  2. BSAFE SSL-J can be configured to run in native mode, using BSAFE Crypto-C Micro Edition to benefit from processor optimization.[210]

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.

Implementation /dev/crypto af_alg Windows CSP CommonCrypto OpenSSL engine
Botan No No No No Partial
BSAFE No No No No No
cryptlib No No No No No
GnuTLS Yes No No No No
JSSE No No Yes No No
LibreSSL No No No No No[222]
MatrixSSL No No No Yes Yes
Mbed TLS No No No No No
NSS No No No No No
OpenSSL Yes Yes No No Yes
SChannel No No Yes No No
Secure Transport No No No Yes No
wolfSSL Yes Yes Partial No No
Erlang/OTP SSL application No No No No Yes
Implementation /dev/crypto af_alg Windows CSP CommonCrypto OpenSSL engine

Cryptographic module/token support
Implementation TPM support Hardware token support Objects identified via
Botan Partial[186] PKCS11
BSAFE Micro-Edition Suite No PKCS11 (via 3rd party module) User-defined label
BSAFE SSL-J No No
cryptlib No PKCS11 User-defined label
GnuTLS Yes PKCS11 RFC 7512 PKCS #11 URLs[223]
JSSE No PKCS11 Java Cryptography Architecture,
Java Cryptography Extension
LibreSSL Yes PKCS11 (via 3rd party module) Custom method
MatrixSSL No PKCS11
Mbed TLS No PKCS11 (via libpkcs11-helper) or standard hooks Custom method
NSS No PKCS11
OpenSSL Yes PKCS11 (via 3rd party module)[224] RFC 7512 PKCS #11 URLs[223]
SChannel No Microsoft CryptoAPI UUID, User-defined label
Secure Transport
wolfSSL Yes PKCS11
Implementation TPM support Hardware token support Objects identified via

Code dependencies
Implementation Dependencies Optional dependencies
Botan C++11 sqlite
zlib (compression)
bzip2 (compression)
liblzma (compression)
boost
openssl (crypto backend)
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)
OpenSSL libc zlib (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
Botan Botan::TLS Makefile Sphinx Included (pluggable) No
Bouncy Castle org.bouncycastle Java Development Environment Programmers reference manual (PDF) Included (pluggable) No
BSAFE Micro-Edition Suite R_* Makefile Developer's guide Included No
BSAFE SSL-J com.rsa.asn1[a]

com.rsa.certj[b]
com.rsa.jcp[c]
com.rsa.jsafe[d]
com.rsa.ssl[e]
com.rsa.jsse[f]

 Java classloader 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[225] Yes (separate package called nss_compat_ossl[226])
OpenSSL SSL_*

SHA1_*
MD5_*
EVP_*
...

 Makefile Man pages Included (monolithic) N/A
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 10% of API)
Implementation Namespace Build tools API manual Crypto back-end OpenSSL compatibility layer
  1. ^
    ASN.1 manipulation classes
  2. ^
    Cert-J proprietary API
  3. ^
    Certificate Path manipulation classes
  4. ^
    Crypto-J proprietary API, JCE, CMS and PKI
    5. API
  5. ^
    SSLJ proprietary API
  6. ^
    JSSE API

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 Micro Edition Suite C89 None Thread-safe Platform dependent Yes No FreeBSD, Linux, macOS, Microsoft Windows, Android, iOS, AIX, Solaris
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, OS X, 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 GNU/Linux, Win32/64, OS X, 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, OS X, Solaris, FreeBSD, NetBSD, OpenBSD, OpenWRT, iPhone (iOS), Xbox, Android, SeggerOS
NSS C89, NSPR[227] NSPR[227] PR_Send() and PR_Recv(). API to supply your own replacement. Thread-safe Platform dependent[228] Yes (but cumbersome) No AIX, Android, FreeBSD, NetBSD, OpenBSD, BeOS, HP-UX, IRIX, Linux, OS X, OS/2, Solaris, OpenVMS, Amiga DE, Windows, WinCE, Sony PlayStation
OpenSSL C89 None Thread-safe Platform dependent Yes No Unix, DOS (with djgpp), Windows, OpenVMS, MacOS, NetWare, eCos
wolfSSL C89 POSIX send() and recv(). API to supply your own replacement. Thread-safe, needs mutex hooks if PThreads or WinThreads not available, can be turned off Random seed set through wolfCrypt Yes Yes Win32/64, Linux, OS X, 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, 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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  87. openssl/engines/ccgost/README.gost
  88. Extensions to support GOST in SChannel might be available.
  89. "Microsoft Security Advisory 3174644".
  90. "Microsoft Security Bulletin MS14-066 - Critical (Section Update FAQ)". Microsoft. November 11, 2014. Retrieved 11 November 2014.
  91. Thomlinson, Matt (November 11, 2014). "Hundreds of Millions of Microsoft Customers Now Benefit from Best-in-Class Encryption". Microsoft Security. Retrieved 11 November 2014.
  92. Update adds new TLS cipher suites and changes cipher suite priorities in Windows 8.1 and Windows Server 2012 R2
  93. RFC 5054
  94. RFC 4279
  95. RFC 5489
  96. RFC 2712
  97. "RSA BSAFE SSL-J 6.2.4 Release Notes". 2018-09-05.
  98. "LibreSSL 2.0.4 released". Retrieved 2014-08-04.
  99. "Bug 405155 - add support for TLS-SRP, rfc5054". Mozilla. Retrieved 2014-01-25.
  100. "Bug 306435 - Mozilla browsers should support the new IETF TLS-PSK protocol to help reduce phishing". Mozilla. Retrieved 2014-01-25.
  101. "Bug 1170510 - Implement NSS server side support for DH_anon". Mozilla. Retrieved 2015-06-03.
  102. "Bug 236245 - Update ECC/TLS to conform to RFC 4492". Mozilla. Retrieved 2014-06-09.
  103. "Changes between 0.9.6h and 0.9.7 [31 Dec 2002]". Retrieved 2016-01-29.
  104. "Changes between 0.9.8n and 1.0.0 [29 Mar 2010]". Retrieved 2016-01-29.
  105. "wolfSSL (Formerly CyaSSL) Release 3.9.0 (03/18/2016)". 2016-03-18. Retrieved 2016-04-05.
  106. RFC 5280
  107. RFC 3280
  108. RFC 2560
  109. RFC 6698, RFC 7218
  110. Laurie, B.; Langley, A.; Kasper, E. (June 2013). Certificate Transparency. IETF. doi:10.17487/RFC6962. ISSN 2070-1721. RFC 6962. Retrieved 2020-08-31.
  111. "MatrixSSL 3.8.3". Archived from the original on 2017-01-19. Retrieved 2017-01-18.
  112. "mbed TLS 2.0 defaults implement best practices". Retrieved 2017-01-18.
  113. "Bug 672600 - Use DNSSEC/DANE chain stapled into TLS handshake in certificate chain validation". Mozilla. Retrieved 2014-06-18.
  114. "How Certificate Revocation Works". Microsoft TechNet. Microsoft. March 16, 2012. Retrieved July 10, 2013.
  115. RFC 5288, RFC 5289
  116. RFC 6655, RFC 7251
  117. RFC 6367
  118. RFC 5932, RFC 6367
  119. RFC 6209
  120. RFC 4162
  121. "Sweet32: Birthday attacks on 64-bit block ciphers in TLS and OpenVPN". sweet32.info.
  122. RFC 7905
  123. "Version 1.11.12, 2015-01-02 — Botan". 2015-01-02. Retrieved 2015-01-09.
  124. "gnutls 3.6.0". 2017-09-21. Retrieved 2018-01-07.
  125. "gnutls 3.4.12". 2016-05-20. Archived from the original on 2016-10-13. Retrieved 2016-05-29.
  126. "JDK 10.0.1 Release Notes". 2018-04-18. Retrieved 2018-08-27.
  127. "JDK 12 Release Notes". Retrieved 2019-06-20.
  128. "Changes in 3.8.3". Retrieved 2016-06-19.
  129. "PolarSSL 1.3.8 release notes".
  130. "Mbed TLS 2.11.0, 2.7.4 and 2.1.13 released". Retrieved 2018-08-30.
  131. "Mbed TLS 2.12.0, 2.7.5 and 2.1.14 released". Retrieved 2018-08-30.
  132. "NSS 3.25 release notes". Mozilla Developer Network. Mozilla. Retrieved 2016-07-01.
  133. "Bug 940119 - libssl does not support any TLS_ECDHE_*_CAMELLIA_*_GCM cipher suites". Mozilla. Retrieved 2013-11-19.
  134. "NSS 3.12 is released". Retrieved 2013-11-19.
  135. "NSS 3.12.3 Release Notes". Mozilla Developer Network. Mozilla. Retrieved 2014-07-01.
  136. "NSS 3.23 release notes". Mozilla Developer Network. Mozilla. Retrieved 2016-03-09.
  137. "openssl/CHANGES at OpenSSL_1_0_1-stable · openssl/openssl". Retrieved 2015-01-20.
  138. Inc., OpenSSL Foundation. "/news/openssl-1.1.1-notes.html". www.openssl.org.
  139. Hofix 984963: TLS AES cipher suites for Microsoft Windows 2003
  140. "Qualys SSL Labs - Projects / User Agent Capabilities: IE 11 / Win 10 Preview". dev.ssllabs.com.
  141. RFC 5469
  142. "Sweet32: Birthday attacks on 64-bit block ciphers in TLS and OpenVPN".
  143. "Version 1.11.15, 2015-03-08 — Botan". 2015-03-08. Retrieved 2015-03-11.
  144. "Java Cryptography Architecture Oracle Providers Documentation". docs.oracle.com.
  145. "NSS 3.15.3 release notes". Mozilla Developer Network. Mozilla. Retrieved 2014-07-13.
  146. "MFSA 2013-103: Miscellaneous Network Security Services (NSS) vulnerabilities". Mozilla. Mozilla. Retrieved 2014-07-13.
  147. "RC4 is now disabled in Microsoft Edge and Internet Explorer 11 - Microsoft Edge Dev BlogMicrosoft Edge Dev Blog". blogs.windows.com. 2016-08-09.
  148. "wolfSSL (Formerly CyaSSL) Release 3.7.0 (10/26/2015)". 2015-10-26. Retrieved 2015-11-19.
  149. 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. Proceedings of the 2012 ACM conference on Computer and communications security (PDF). pp. 62–72. ISBN 978-1-4503-1651-4.CS1 maint: multiple names: authors list (link)
  150. RFC 7027
  151. Simon, Josefsson; Yoav, Nir; Manuel, Pégourié-Gonnard. "Elliptic Curve Cryptography (ECC) Cipher Suites for Transport Layer Security (TLS) Versions 1.2 and Earlier". tools.ietf.org.
  152. Simon, Josefsson; Manuel, Pégourié-Gonnard. "Curve25519 and Curve448 for Transport Layer Security (TLS)". tools.ietf.org.
  153. Simon, Josefsson; Manuel, Pégourié-Gonnard. "Additional Elliptic Curves for Transport Layer Security (TLS) Key Agreement". tools.ietf.org.
  154. "Version 1.11.5, 2013-11-10 — Botan". 2013-11-10. Retrieved 2015-01-23.
  155. "An overview of the new features in GnuTLS 3.5.0". 2016-05-02. Retrieved 2016-12-09.
  156. "JDK 13 Early-Access Release Notes". Retrieved 2019-06-20.
  157. "LibreSSL 2.5.1 release notes". OpenBSD. 2017-01-31. Retrieved 2017-02-23.
  158. "MatrixSSL 4.0 changelog". Retrieved 2018-09-18.
  159. "PolarSSL 1.3.1 released". 2013-10-15. Retrieved 2015-01-23.
  160. "PolarSSL 1.3.3 released". 2013-12-31. Retrieved 2015-01-23.
  161. "Mbed TLS 2.9.0, 2.7.3 and 2.1.12 released". Retrieved 2018-08-30.
  162. "Bug 943639 - Support for Brainpool ECC Curve (rfc5639)". Mozilla. Retrieved 2014-01-25.
  163. "Bug 957105 - Add support for curve25519 Key Exchange and UMAC MAC support for TLS". Mozilla. Retrieved 2017-02-23.
  164. "OpenSSL 1.1.0x Release Notes". 25 August 2016. Retrieved 18 May 2018.
  165. "OpenSSL  GitHub Issue #487 Tracker". 2 December 2015. Retrieved 18 May 2018.
  166. "OpenSSL 1.1.1x Release Notes". 1 May 2018. Retrieved 18 May 2018.
  167. "OpenSSL  GitHub Issue #5049 Tracker". 9 January 2018. Retrieved 18 May 2018.
  168. "wolfSSL (Formerly CyaSSL) Release 3.4.6 (03/30/2015)". 2015-03-30. Retrieved 2015-11-19.
  169. "SHA2 and Windows". Retrieved 2014-09-08.
  170. RFC 3749
  171. RFC 5746
  172. RFC 6066
  173. RFC 7301
  174. RFC 6091
  175. RFC 4680
  176. RFC 5077
  177. RFC 5705
  178. RFC 7366
  179. RFC 7507
  180. RFC 7627
  181. RFC 7685
  182. RFC 7250
  183. "Version 1.11.16, 2015-03-29 — Botan". 2016-03-29. Retrieved 2016-09-08.
  184. "Version 1.11.10, 2014-12-10 — Botan". 2014-12-10. Retrieved 2014-12-14.
  185. "Version 1.11.26, 2016-01-04 — Botan". 2016-01-04. Retrieved 2016-02-25.
  186. Present, but disabled by default due to lack of use by any implementation.
  187. "gnutls 3.2.0". Archived from the original on 2016-01-31. Retrieved 2015-01-26.
  188. https://lists.gnupg.org/pipermail/gnutls-help/2017-August/004364.html
  189. "gnutls 3.4.4". Archived from the original on 2017-07-17. Retrieved 2015-08-25.
  190. "%DUMBFW priority keyword". Retrieved 2017-04-30.
  191. "gnutls 3.6.6". 2019-01-25. Retrieved 2019-09-01.
  192. "LibreSSL 2.1.3 released". 2015-01-22. Retrieved 2015-01-22.
  193. "LibreSSL 2.1.4 released". 2015-03-04. Retrieved 2015-03-04.
  194. "MatrixSSL - News". 2014-12-04. Archived from the original on 2015-02-14. Retrieved 2015-01-26.
  195. "Download overview - PolarSSL". 2014-04-11. Retrieved 2015-01-26.
  196. "mbed TLS 1.3.10 released". 2015-02-08. Retrieved 2015-02-09.
  197. "NSS 3.15.5 release notes". Mozilla Developer Network. Mozilla. Retrieved 2015-01-26.
  198. "Bug 961416 - Support RFC6091 - Using OpenPGP Keys for Transport Layer Security Authentication (TLS1.2)". Mozilla. Retrieved 2014-06-18.
  199. "Bug 972145 - Implement the encrypt-then-MAC TLS extension". Mozilla. Retrieved 2014-11-06.
  200. "NSS 3.17.1 release notes". Retrieved 2014-10-17.
  201. "NSS 3.21 release notes". Retrieved 2015-11-14.
  202. http://www.openssl.org/news/secadv_20141015.txt
  203. "OpenSSL 1.1.0 Release Notesl".
  204. "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.
  205. "Microsoft Security Bulletin MS15-121". Retrieved 2017-11-29.
  206. "What's New in TLS/SSL (Schannel SSP)". Retrieved 2014-06-18.
  207. "Version 1.11.31, 2015-08-30 — Botan". 2016-08-30. Retrieved 2016-09-08.
  208. "Leverage CPU Instructions for AES Cryptography".
  209. "RSA BSAFE SSL-J 6.2.5 - Release Notes".
  210. https://lists.gnupg.org/pipermail/gnutls-devel/2016-October/008194.html
  211. "Java SSL provider with AES-NI support". stackoverflow.com.
  212. "We've incorporated support for AES-NI in our AES and GCM modules". 2013-12-31. Retrieved 2014-01-07.
  213. Normally NSS's libssl performs all operations via the PKCS#11 interface, either to hardware or software tokens
  214. "Bug 706024 - AES-NI enhancements to NSS on Sandy Bridge systems". Retrieved 2013-09-28.
  215. "Bug 479744 - RFE : VIA Padlock ACE support (hardware RNG, AES, SHA1 and SHA256)". Retrieved 2014-04-11.
  216. https://habrahabr.ru/post/134725/, http://forum.rutoken.ru/topic/1639/, https://dev.rutoken.ru/pages/viewpage.action?pageId=18055184 (in Russian)
  217. "git.openssl.org Git - openssl.git/commitdiff". git.openssl.org.
  218. https://opensource.apple.com/source/Security/Security-55179.13/sec/Security/SecECKey.c
  219. http://km.support.apple.com/library/APPLE/APPLECARE_ALLGEOS/HT5396/Crypto_Officer_Role_Guide_for_FIPS_140-2_Compliance_OS_X_Mountain_Lion_v10.8.pdf
  220. "wolfSSL Asynchronous Intel QuickAssist Support - wolfSSL". 18 January 2017.
  221. "LibreSSL 2.2.1 Released". 2015-07-08. Retrieved 2016-01-30.
  222. RFC 7512
  223. "libp11: PKCS#11 wrapper library". 19 January 2018 – via GitHub.
  224. On the fly replaceable/augmentable.
  225. "Nss compat ossl - Fedora Project Wiki". fedoraproject.org.
  226. "NSPR". Mozilla Developer Network.
  227. 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.
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