xref: /freebsd-11-stable/crypto/openssl/doc/apps/ciphers.pod

=pod

=head1 NAME

openssl-ciphers,
ciphers - SSL cipher display and cipher list tool.

=head1 SYNOPSIS

B<openssl> B<ciphers>
[B<-v>]
[B<-V>]
[B<-ssl2>]
[B<-ssl3>]
[B<-tls1>]
[B<cipherlist>]

=head1 DESCRIPTION

The B<ciphers> command converts textual OpenSSL cipher lists into ordered
SSL cipher preference lists. It can be used as a test tool to determine
the appropriate cipherlist.

=head1 COMMAND OPTIONS

=over 4

=item B<-v>

Verbose option. List ciphers with a complete description of
protocol version (SSLv2 or SSLv3; the latter includes TLS), key exchange,
authentication, encryption and mac algorithms used along with any key size
restrictions and whether the algorithm is classed as an "export" cipher.
Note that without the B<-v> option, ciphers may seem to appear twice
in a cipher list; this is when similar ciphers are available for
SSL v2 and for SSL v3/TLS v1.

=item B<-V>

Like B<-v>, but include cipher suite codes in output (hex format).

=item B<-ssl3>, B<-tls1>

This lists ciphers compatible with any of SSLv3, TLSv1, TLSv1.1 or TLSv1.2.

=item B<-ssl2>

Only include SSLv2 ciphers.

=item B<-h>, B<-?>

Print a brief usage message.

=item B<cipherlist>

A cipher list to convert to a cipher preference list. If it is not included
then the default cipher list will be used. The format is described below.

=back

=head1 CIPHER LIST FORMAT

The cipher list consists of one or more I<cipher strings> separated by colons.
Commas or spaces are also acceptable separators but colons are normally used.

The actual cipher string can take several different forms.

It can consist of a single cipher suite such as B<RC4-SHA>.

It can represent a list of cipher suites containing a certain algorithm, or
cipher suites of a certain type. For example B<SHA1> represents all ciphers
suites using the digest algorithm SHA1 and B<SSLv3> represents all SSL v3
algorithms.

Lists of cipher suites can be combined in a single cipher string using the
B<+> character. This is used as a logical B<and> operation. For example
B<SHA1+DES> represents all cipher suites containing the SHA1 B<and> the DES
algorithms.

Each cipher string can be optionally preceded by the characters B<!>,
B<-> or B<+>.

If B<!> is used then the ciphers are permanently deleted from the list.
The ciphers deleted can never reappear in the list even if they are
explicitly stated.

If B<-> is used then the ciphers are deleted from the list, but some or
all of the ciphers can be added again by later options.

If B<+> is used then the ciphers are moved to the end of the list. This
option doesn't add any new ciphers it just moves matching existing ones.

If none of these characters is present then the string is just interpreted
as a list of ciphers to be appended to the current preference list. If the
list includes any ciphers already present they will be ignored: that is they
will not moved to the end of the list.

Additionally the cipher string B<@STRENGTH> can be used at any point to sort
the current cipher list in order of encryption algorithm key length.

=head1 CIPHER STRINGS

The following is a list of all permitted cipher strings and their meanings.

=over 4

=item B<DEFAULT>

The default cipher list.
This is determined at compile time and is normally
B<ALL:!EXPORT:!LOW:!aNULL:!eNULL:!SSLv2>.
When used, this must be the first cipherstring specified.

=item B<COMPLEMENTOFDEFAULT>

the ciphers included in B<ALL>, but not enabled by default. Currently
this is B<ADH> and B<AECDH>. Note that this rule does not cover B<eNULL>,
which is not included by B<ALL> (use B<COMPLEMENTOFALL> if necessary).

=item B<ALL>

all cipher suites except the B<eNULL> ciphers which must be explicitly enabled;
as of OpenSSL, the B<ALL> cipher suites are reasonably ordered by default

=item B<COMPLEMENTOFALL>

the cipher suites not enabled by B<ALL>, currently being B<eNULL>.

=item B<HIGH>

"high" encryption cipher suites. This currently means those with key lengths larger
than 128 bits, and some cipher suites with 128-bit keys.

=item B<MEDIUM>

"medium" encryption cipher suites, currently some of those using 128 bit encryption.

=item B<LOW>

Low strength encryption cipher suites, currently those using 64 or 56 bit
encryption algorithms but excluding export cipher suites.
As of OpenSSL 1.0.2g, these are disabled in default builds.

=item B<EXP>, B<EXPORT>

Export strength encryption algorithms. Including 40 and 56 bits algorithms.
As of OpenSSL 1.0.2g, these are disabled in default builds.

=item B<EXPORT40>

40-bit export encryption algorithms
As of OpenSSL 1.0.2g, these are disabled in default builds.

=item B<EXPORT56>

56-bit export encryption algorithms. In OpenSSL 0.9.8c and later the set of
56 bit export ciphers is empty unless OpenSSL has been explicitly configured
with support for experimental ciphers.
As of OpenSSL 1.0.2g, these are disabled in default builds.

=item B<eNULL>, B<NULL>

The "NULL" ciphers that is those offering no encryption. Because these offer no
encryption at all and are a security risk they are not enabled via either the
B<DEFAULT> or B<ALL> cipher strings.
Be careful when building cipherlists out of lower-level primitives such as
B<kRSA> or B<aECDSA> as these do overlap with the B<eNULL> ciphers.
When in doubt, include B<!eNULL> in your cipherlist.

=item B<aNULL>

The cipher suites offering no authentication. This is currently the anonymous
DH algorithms and anonymous ECDH algorithms. These cipher suites are vulnerable
to a "man in the middle" attack and so their use is normally discouraged.
These are excluded from the B<DEFAULT> ciphers, but included in the B<ALL>
ciphers.
Be careful when building cipherlists out of lower-level primitives such as
B<kDHE> or B<AES> as these do overlap with the B<aNULL> ciphers.
When in doubt, include B<!aNULL> in your cipherlist.

=item B<kRSA>, B<RSA>

cipher suites using RSA key exchange or authentication. B<RSA> is an alias for
B<kRSA>.

=item B<kDHr>, B<kDHd>, B<kDH>

cipher suites using DH key agreement and DH certificates signed by CAs with RSA
and DSS keys or either respectively.

=item B<kDHE>, B<kEDH>

cipher suites using ephemeral DH key agreement, including anonymous cipher
suites.

=item B<DHE>, B<EDH>

cipher suites using authenticated ephemeral DH key agreement.

=item B<ADH>

anonymous DH cipher suites, note that this does not include anonymous Elliptic
Curve DH (ECDH) cipher suites.

=item B<DH>

cipher suites using DH, including anonymous DH, ephemeral DH and fixed DH.

=item B<kECDHr>, B<kECDHe>, B<kECDH>

cipher suites using fixed ECDH key agreement signed by CAs with RSA and ECDSA
keys or either respectively.

=item B<kECDHE>, B<kEECDH>

cipher suites using ephemeral ECDH key agreement, including anonymous
cipher suites.

=item B<ECDHE>, B<EECDH>

cipher suites using authenticated ephemeral ECDH key agreement.

=item B<AECDH>

anonymous Elliptic Curve Diffie Hellman cipher suites.

=item B<ECDH>

cipher suites using ECDH key exchange, including anonymous, ephemeral and
fixed ECDH.

=item B<aRSA>

cipher suites using RSA authentication, i.e. the certificates carry RSA keys.

=item B<aDSS>, B<DSS>

cipher suites using DSS authentication, i.e. the certificates carry DSS keys.

=item B<aDH>

cipher suites effectively using DH authentication, i.e. the certificates carry
DH keys.

=item B<aECDH>

cipher suites effectively using ECDH authentication, i.e. the certificates
carry ECDH keys.

=item B<aECDSA>, B<ECDSA>

cipher suites using ECDSA authentication, i.e. the certificates carry ECDSA
keys.

=item B<kFZA>, B<aFZA>, B<eFZA>, B<FZA>

ciphers suites using FORTEZZA key exchange, authentication, encryption or all
FORTEZZA algorithms. Not implemented.

=item B<TLSv1.2>, B<TLSv1>, B<SSLv3>, B<SSLv2>

TLS v1.2, TLS v1.0, SSL v3.0 or SSL v2.0 cipher suites respectively. Note:
there are no ciphersuites specific to TLS v1.1.

=item B<AES128>, B<AES256>, B<AES>

cipher suites using 128 bit AES, 256 bit AES or either 128 or 256 bit AES.

=item B<AESGCM>

AES in Galois Counter Mode (GCM): these ciphersuites are only supported
in TLS v1.2.

=item B<CAMELLIA128>, B<CAMELLIA256>, B<CAMELLIA>

cipher suites using 128 bit CAMELLIA, 256 bit CAMELLIA or either 128 or 256 bit
CAMELLIA.

=item B<3DES>

cipher suites using triple DES.

=item B<DES>

cipher suites using DES (not triple DES).

=item B<RC4>

cipher suites using RC4.

=item B<RC2>

cipher suites using RC2.

=item B<IDEA>

cipher suites using IDEA.

=item B<SEED>

cipher suites using SEED.

=item B<MD5>

cipher suites using MD5.

=item B<SHA1>, B<SHA>

cipher suites using SHA1.

=item B<SHA256>, B<SHA384>

ciphersuites using SHA256 or SHA384.

=item B<aGOST> 

cipher suites using GOST R 34.10 (either 2001 or 94) for authenticaction
(needs an engine supporting GOST algorithms). 

=item B<aGOST01>

cipher suites using GOST R 34.10-2001 authentication.

=item B<aGOST94>

cipher suites using GOST R 34.10-94 authentication (note that R 34.10-94
standard has been expired so use GOST R 34.10-2001)

=item B<kGOST>

cipher suites, using VKO 34.10 key exchange, specified in the RFC 4357.

=item B<GOST94>

cipher suites, using HMAC based on GOST R 34.11-94.

=item B<GOST89MAC>

cipher suites using GOST 28147-89 MAC B<instead of> HMAC.

=item B<PSK>

cipher suites using pre-shared keys (PSK).

=item B<SUITEB128>, B<SUITEB128ONLY>, B<SUITEB192>

enables suite B mode operation using 128 (permitting 192 bit mode by peer)
128 bit (not permitting 192 bit by peer) or 192 bit level of security
respectively. If used these cipherstrings should appear first in the cipher
list and anything after them is ignored. Setting Suite B mode has additional
consequences required to comply with RFC6460. In particular the supported
signature algorithms is reduced to support only ECDSA and SHA256 or SHA384,
only the elliptic curves P-256 and P-384 can be used and only the two suite B
compliant ciphersuites (ECDHE-ECDSA-AES128-GCM-SHA256 and
ECDHE-ECDSA-AES256-GCM-SHA384) are permissible.

=back

=head1 CIPHER SUITE NAMES

The following lists give the SSL or TLS cipher suites names from the
relevant specification and their OpenSSL equivalents. It should be noted,
that several cipher suite names do not include the authentication used,
e.g. DES-CBC3-SHA. In these cases, RSA authentication is used.

=head2 SSL v3.0 cipher suites.

 SSL_RSA_WITH_NULL_MD5                   NULL-MD5
 SSL_RSA_WITH_NULL_SHA                   NULL-SHA
 SSL_RSA_EXPORT_WITH_RC4_40_MD5          EXP-RC4-MD5
 SSL_RSA_WITH_RC4_128_MD5                RC4-MD5
 SSL_RSA_WITH_RC4_128_SHA                RC4-SHA
 SSL_RSA_EXPORT_WITH_RC2_CBC_40_MD5      EXP-RC2-CBC-MD5
 SSL_RSA_WITH_IDEA_CBC_SHA               IDEA-CBC-SHA
 SSL_RSA_EXPORT_WITH_DES40_CBC_SHA       EXP-DES-CBC-SHA
 SSL_RSA_WITH_DES_CBC_SHA                DES-CBC-SHA
 SSL_RSA_WITH_3DES_EDE_CBC_SHA           DES-CBC3-SHA

 SSL_DH_DSS_WITH_DES_CBC_SHA             DH-DSS-DES-CBC-SHA
 SSL_DH_DSS_WITH_3DES_EDE_CBC_SHA        DH-DSS-DES-CBC3-SHA
 SSL_DH_RSA_WITH_DES_CBC_SHA             DH-RSA-DES-CBC-SHA
 SSL_DH_RSA_WITH_3DES_EDE_CBC_SHA        DH-RSA-DES-CBC3-SHA
 SSL_DHE_DSS_EXPORT_WITH_DES40_CBC_SHA   EXP-EDH-DSS-DES-CBC-SHA
 SSL_DHE_DSS_WITH_DES_CBC_SHA            EDH-DSS-CBC-SHA
 SSL_DHE_DSS_WITH_3DES_EDE_CBC_SHA       EDH-DSS-DES-CBC3-SHA
 SSL_DHE_RSA_EXPORT_WITH_DES40_CBC_SHA   EXP-EDH-RSA-DES-CBC-SHA
 SSL_DHE_RSA_WITH_DES_CBC_SHA            EDH-RSA-DES-CBC-SHA
 SSL_DHE_RSA_WITH_3DES_EDE_CBC_SHA       EDH-RSA-DES-CBC3-SHA

 SSL_DH_anon_EXPORT_WITH_RC4_40_MD5      EXP-ADH-RC4-MD5
 SSL_DH_anon_WITH_RC4_128_MD5            ADH-RC4-MD5
 SSL_DH_anon_EXPORT_WITH_DES40_CBC_SHA   EXP-ADH-DES-CBC-SHA
 SSL_DH_anon_WITH_DES_CBC_SHA            ADH-DES-CBC-SHA
 SSL_DH_anon_WITH_3DES_EDE_CBC_SHA       ADH-DES-CBC3-SHA

 SSL_FORTEZZA_KEA_WITH_NULL_SHA          Not implemented.
 SSL_FORTEZZA_KEA_WITH_FORTEZZA_CBC_SHA  Not implemented.
 SSL_FORTEZZA_KEA_WITH_RC4_128_SHA       Not implemented.

=head2 TLS v1.0 cipher suites.

 TLS_RSA_WITH_NULL_MD5                   NULL-MD5
 TLS_RSA_WITH_NULL_SHA                   NULL-SHA
 TLS_RSA_EXPORT_WITH_RC4_40_MD5          EXP-RC4-MD5
 TLS_RSA_WITH_RC4_128_MD5                RC4-MD5
 TLS_RSA_WITH_RC4_128_SHA                RC4-SHA
 TLS_RSA_EXPORT_WITH_RC2_CBC_40_MD5      EXP-RC2-CBC-MD5
 TLS_RSA_WITH_IDEA_CBC_SHA               IDEA-CBC-SHA
 TLS_RSA_EXPORT_WITH_DES40_CBC_SHA       EXP-DES-CBC-SHA
 TLS_RSA_WITH_DES_CBC_SHA                DES-CBC-SHA
 TLS_RSA_WITH_3DES_EDE_CBC_SHA           DES-CBC3-SHA

 TLS_DH_DSS_EXPORT_WITH_DES40_CBC_SHA    Not implemented.
 TLS_DH_DSS_WITH_DES_CBC_SHA             Not implemented.
 TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA        Not implemented.
 TLS_DH_RSA_EXPORT_WITH_DES40_CBC_SHA    Not implemented.
 TLS_DH_RSA_WITH_DES_CBC_SHA             Not implemented.
 TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA        Not implemented.
 TLS_DHE_DSS_EXPORT_WITH_DES40_CBC_SHA   EXP-EDH-DSS-DES-CBC-SHA
 TLS_DHE_DSS_WITH_DES_CBC_SHA            EDH-DSS-CBC-SHA
 TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA       EDH-DSS-DES-CBC3-SHA
 TLS_DHE_RSA_EXPORT_WITH_DES40_CBC_SHA   EXP-EDH-RSA-DES-CBC-SHA
 TLS_DHE_RSA_WITH_DES_CBC_SHA            EDH-RSA-DES-CBC-SHA
 TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA       EDH-RSA-DES-CBC3-SHA

 TLS_DH_anon_EXPORT_WITH_RC4_40_MD5      EXP-ADH-RC4-MD5
 TLS_DH_anon_WITH_RC4_128_MD5            ADH-RC4-MD5
 TLS_DH_anon_EXPORT_WITH_DES40_CBC_SHA   EXP-ADH-DES-CBC-SHA
 TLS_DH_anon_WITH_DES_CBC_SHA            ADH-DES-CBC-SHA
 TLS_DH_anon_WITH_3DES_EDE_CBC_SHA       ADH-DES-CBC3-SHA

=head2 AES ciphersuites from RFC3268, extending TLS v1.0

 TLS_RSA_WITH_AES_128_CBC_SHA            AES128-SHA
 TLS_RSA_WITH_AES_256_CBC_SHA            AES256-SHA

 TLS_DH_DSS_WITH_AES_128_CBC_SHA         DH-DSS-AES128-SHA
 TLS_DH_DSS_WITH_AES_256_CBC_SHA         DH-DSS-AES256-SHA
 TLS_DH_RSA_WITH_AES_128_CBC_SHA         DH-RSA-AES128-SHA
 TLS_DH_RSA_WITH_AES_256_CBC_SHA         DH-RSA-AES256-SHA

 TLS_DHE_DSS_WITH_AES_128_CBC_SHA        DHE-DSS-AES128-SHA
 TLS_DHE_DSS_WITH_AES_256_CBC_SHA        DHE-DSS-AES256-SHA
 TLS_DHE_RSA_WITH_AES_128_CBC_SHA        DHE-RSA-AES128-SHA
 TLS_DHE_RSA_WITH_AES_256_CBC_SHA        DHE-RSA-AES256-SHA

 TLS_DH_anon_WITH_AES_128_CBC_SHA        ADH-AES128-SHA
 TLS_DH_anon_WITH_AES_256_CBC_SHA        ADH-AES256-SHA

=head2 Camellia ciphersuites from RFC4132, extending TLS v1.0

 TLS_RSA_WITH_CAMELLIA_128_CBC_SHA      CAMELLIA128-SHA
 TLS_RSA_WITH_CAMELLIA_256_CBC_SHA      CAMELLIA256-SHA

 TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA   DH-DSS-CAMELLIA128-SHA
 TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA   DH-DSS-CAMELLIA256-SHA
 TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA   DH-RSA-CAMELLIA128-SHA
 TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA   DH-RSA-CAMELLIA256-SHA

 TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA  DHE-DSS-CAMELLIA128-SHA
 TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA  DHE-DSS-CAMELLIA256-SHA
 TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA  DHE-RSA-CAMELLIA128-SHA
 TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA  DHE-RSA-CAMELLIA256-SHA

 TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA  ADH-CAMELLIA128-SHA
 TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA  ADH-CAMELLIA256-SHA

=head2 SEED ciphersuites from RFC4162, extending TLS v1.0

 TLS_RSA_WITH_SEED_CBC_SHA              SEED-SHA

 TLS_DH_DSS_WITH_SEED_CBC_SHA           DH-DSS-SEED-SHA
 TLS_DH_RSA_WITH_SEED_CBC_SHA           DH-RSA-SEED-SHA

 TLS_DHE_DSS_WITH_SEED_CBC_SHA          DHE-DSS-SEED-SHA
 TLS_DHE_RSA_WITH_SEED_CBC_SHA          DHE-RSA-SEED-SHA

 TLS_DH_anon_WITH_SEED_CBC_SHA          ADH-SEED-SHA

=head2 GOST ciphersuites from draft-chudov-cryptopro-cptls, extending TLS v1.0

Note: these ciphers require an engine which including GOST cryptographic
algorithms, such as the B<ccgost> engine, included in the OpenSSL distribution.

 TLS_GOSTR341094_WITH_28147_CNT_IMIT GOST94-GOST89-GOST89
 TLS_GOSTR341001_WITH_28147_CNT_IMIT GOST2001-GOST89-GOST89
 TLS_GOSTR341094_WITH_NULL_GOSTR3411 GOST94-NULL-GOST94
 TLS_GOSTR341001_WITH_NULL_GOSTR3411 GOST2001-NULL-GOST94

=head2 Additional Export 1024 and other cipher suites

Note: these ciphers can also be used in SSL v3.

 TLS_RSA_EXPORT1024_WITH_DES_CBC_SHA     EXP1024-DES-CBC-SHA
 TLS_RSA_EXPORT1024_WITH_RC4_56_SHA      EXP1024-RC4-SHA
 TLS_DHE_DSS_EXPORT1024_WITH_DES_CBC_SHA EXP1024-DHE-DSS-DES-CBC-SHA
 TLS_DHE_DSS_EXPORT1024_WITH_RC4_56_SHA  EXP1024-DHE-DSS-RC4-SHA
 TLS_DHE_DSS_WITH_RC4_128_SHA            DHE-DSS-RC4-SHA

=head2 Elliptic curve cipher suites.

 TLS_ECDH_RSA_WITH_NULL_SHA              ECDH-RSA-NULL-SHA
 TLS_ECDH_RSA_WITH_RC4_128_SHA           ECDH-RSA-RC4-SHA
 TLS_ECDH_RSA_WITH_3DES_EDE_CBC_SHA      ECDH-RSA-DES-CBC3-SHA
 TLS_ECDH_RSA_WITH_AES_128_CBC_SHA       ECDH-RSA-AES128-SHA
 TLS_ECDH_RSA_WITH_AES_256_CBC_SHA       ECDH-RSA-AES256-SHA

 TLS_ECDH_ECDSA_WITH_NULL_SHA            ECDH-ECDSA-NULL-SHA
 TLS_ECDH_ECDSA_WITH_RC4_128_SHA         ECDH-ECDSA-RC4-SHA
 TLS_ECDH_ECDSA_WITH_3DES_EDE_CBC_SHA    ECDH-ECDSA-DES-CBC3-SHA
 TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA     ECDH-ECDSA-AES128-SHA
 TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA     ECDH-ECDSA-AES256-SHA

 TLS_ECDHE_RSA_WITH_NULL_SHA             ECDHE-RSA-NULL-SHA
 TLS_ECDHE_RSA_WITH_RC4_128_SHA          ECDHE-RSA-RC4-SHA
 TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA     ECDHE-RSA-DES-CBC3-SHA
 TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA      ECDHE-RSA-AES128-SHA
 TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA      ECDHE-RSA-AES256-SHA

 TLS_ECDHE_ECDSA_WITH_NULL_SHA           ECDHE-ECDSA-NULL-SHA
 TLS_ECDHE_ECDSA_WITH_RC4_128_SHA        ECDHE-ECDSA-RC4-SHA
 TLS_ECDHE_ECDSA_WITH_3DES_EDE_CBC_SHA   ECDHE-ECDSA-DES-CBC3-SHA
 TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA    ECDHE-ECDSA-AES128-SHA
 TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA    ECDHE-ECDSA-AES256-SHA

 TLS_ECDH_anon_WITH_NULL_SHA             AECDH-NULL-SHA
 TLS_ECDH_anon_WITH_RC4_128_SHA          AECDH-RC4-SHA
 TLS_ECDH_anon_WITH_3DES_EDE_CBC_SHA     AECDH-DES-CBC3-SHA
 TLS_ECDH_anon_WITH_AES_128_CBC_SHA      AECDH-AES128-SHA
 TLS_ECDH_anon_WITH_AES_256_CBC_SHA      AECDH-AES256-SHA

=head2 TLS v1.2 cipher suites

 TLS_RSA_WITH_NULL_SHA256                  NULL-SHA256

 TLS_RSA_WITH_AES_128_CBC_SHA256           AES128-SHA256
 TLS_RSA_WITH_AES_256_CBC_SHA256           AES256-SHA256
 TLS_RSA_WITH_AES_128_GCM_SHA256           AES128-GCM-SHA256
 TLS_RSA_WITH_AES_256_GCM_SHA384           AES256-GCM-SHA384

 TLS_DH_RSA_WITH_AES_128_CBC_SHA256        DH-RSA-AES128-SHA256
 TLS_DH_RSA_WITH_AES_256_CBC_SHA256        DH-RSA-AES256-SHA256
 TLS_DH_RSA_WITH_AES_128_GCM_SHA256        DH-RSA-AES128-GCM-SHA256
 TLS_DH_RSA_WITH_AES_256_GCM_SHA384        DH-RSA-AES256-GCM-SHA384

 TLS_DH_DSS_WITH_AES_128_CBC_SHA256        DH-DSS-AES128-SHA256
 TLS_DH_DSS_WITH_AES_256_CBC_SHA256        DH-DSS-AES256-SHA256
 TLS_DH_DSS_WITH_AES_128_GCM_SHA256        DH-DSS-AES128-GCM-SHA256
 TLS_DH_DSS_WITH_AES_256_GCM_SHA384        DH-DSS-AES256-GCM-SHA384

 TLS_DHE_RSA_WITH_AES_128_CBC_SHA256       DHE-RSA-AES128-SHA256
 TLS_DHE_RSA_WITH_AES_256_CBC_SHA256       DHE-RSA-AES256-SHA256
 TLS_DHE_RSA_WITH_AES_128_GCM_SHA256       DHE-RSA-AES128-GCM-SHA256
 TLS_DHE_RSA_WITH_AES_256_GCM_SHA384       DHE-RSA-AES256-GCM-SHA384

 TLS_DHE_DSS_WITH_AES_128_CBC_SHA256       DHE-DSS-AES128-SHA256
 TLS_DHE_DSS_WITH_AES_256_CBC_SHA256       DHE-DSS-AES256-SHA256
 TLS_DHE_DSS_WITH_AES_128_GCM_SHA256       DHE-DSS-AES128-GCM-SHA256
 TLS_DHE_DSS_WITH_AES_256_GCM_SHA384       DHE-DSS-AES256-GCM-SHA384

 TLS_ECDH_RSA_WITH_AES_128_CBC_SHA256      ECDH-RSA-AES128-SHA256
 TLS_ECDH_RSA_WITH_AES_256_CBC_SHA384      ECDH-RSA-AES256-SHA384
 TLS_ECDH_RSA_WITH_AES_128_GCM_SHA256      ECDH-RSA-AES128-GCM-SHA256
 TLS_ECDH_RSA_WITH_AES_256_GCM_SHA384      ECDH-RSA-AES256-GCM-SHA384

 TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA256    ECDH-ECDSA-AES128-SHA256
 TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA384    ECDH-ECDSA-AES256-SHA384
 TLS_ECDH_ECDSA_WITH_AES_128_GCM_SHA256    ECDH-ECDSA-AES128-GCM-SHA256
 TLS_ECDH_ECDSA_WITH_AES_256_GCM_SHA384    ECDH-ECDSA-AES256-GCM-SHA384

 TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256     ECDHE-RSA-AES128-SHA256
 TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384     ECDHE-RSA-AES256-SHA384
 TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256     ECDHE-RSA-AES128-GCM-SHA256
 TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384     ECDHE-RSA-AES256-GCM-SHA384

 TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256   ECDHE-ECDSA-AES128-SHA256
 TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384   ECDHE-ECDSA-AES256-SHA384
 TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256   ECDHE-ECDSA-AES128-GCM-SHA256
 TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384   ECDHE-ECDSA-AES256-GCM-SHA384

 TLS_DH_anon_WITH_AES_128_CBC_SHA256       ADH-AES128-SHA256
 TLS_DH_anon_WITH_AES_256_CBC_SHA256       ADH-AES256-SHA256
 TLS_DH_anon_WITH_AES_128_GCM_SHA256       ADH-AES128-GCM-SHA256
 TLS_DH_anon_WITH_AES_256_GCM_SHA384       ADH-AES256-GCM-SHA384

=head2 Pre shared keying (PSK) cipheruites

 TLS_PSK_WITH_RC4_128_SHA                  PSK-RC4-SHA
 TLS_PSK_WITH_3DES_EDE_CBC_SHA             PSK-3DES-EDE-CBC-SHA
 TLS_PSK_WITH_AES_128_CBC_SHA              PSK-AES128-CBC-SHA
 TLS_PSK_WITH_AES_256_CBC_SHA              PSK-AES256-CBC-SHA

=head2 Deprecated SSL v2.0 cipher suites.

 SSL_CK_RC4_128_WITH_MD5                 RC4-MD5
 SSL_CK_RC4_128_EXPORT40_WITH_MD5        Not implemented.
 SSL_CK_RC2_128_CBC_WITH_MD5             RC2-CBC-MD5
 SSL_CK_RC2_128_CBC_EXPORT40_WITH_MD5    Not implemented.
 SSL_CK_IDEA_128_CBC_WITH_MD5            IDEA-CBC-MD5
 SSL_CK_DES_64_CBC_WITH_MD5              Not implemented.
 SSL_CK_DES_192_EDE3_CBC_WITH_MD5        DES-CBC3-MD5

=head1 NOTES

Some compiled versions of OpenSSL may not include all the ciphers
listed here because some ciphers were excluded at compile time.

=head1 EXAMPLES

Verbose listing of all OpenSSL ciphers including NULL ciphers:

 openssl ciphers -v 'ALL:eNULL'

Include all ciphers except NULL and anonymous DH then sort by
strength:

 openssl ciphers -v 'ALL:!ADH:@STRENGTH'

Include all ciphers except ones with no encryption (eNULL) or no
authentication (aNULL):

 openssl ciphers -v 'ALL:!aNULL'

Include only 3DES ciphers and then place RSA ciphers last:

 openssl ciphers -v '3DES:+RSA'

Include all RC4 ciphers but leave out those without authentication:

 openssl ciphers -v 'RC4:!COMPLEMENTOFDEFAULT'

Include all chiphers with RSA authentication but leave out ciphers without
encryption.

 openssl ciphers -v 'RSA:!COMPLEMENTOFALL'

=head1 SEE ALSO

L<s_client(1)|s_client(1)>, L<s_server(1)|s_server(1)>, L<ssl(3)|ssl(3)>

=head1 HISTORY

The B<COMPLENTOFALL> and B<COMPLEMENTOFDEFAULT> selection options
for cipherlist strings were added in OpenSSL 0.9.7.
The B<-V> option for the B<ciphers> command was added in OpenSSL 1.0.0.

=cut