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CIPHERS(1)			    OpenSSL			    CIPHERS(1)

NAME
       ciphers - SSL cipher display and cipher list tool.

SYNOPSIS
       openssl ciphers [-v] [-ssl2] [-ssl3] [-tls1] [cipherlist]

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

COMMAND OPTIONS
       -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 -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.

       -ssl3
	   only include SSL v3 ciphers.

       -ssl2
	   only include SSL v2 ciphers.

       -tls1
	   only include TLS v1 ciphers.

       -h, -?
	   print a brief usage message.

       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.

CIPHER LIST FORMAT
       The cipher list consists of one or more 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 RC4-SHA.

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

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

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

       If ! 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 - 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 + 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 @STRENGTH can be used at any point to
       sort the current cipher list in order of encryption algorithm key
       length.

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

       DEFAULT
	   the default cipher list. This is determined at compile time and is
	   normally ALL:!ADH:RC4+RSA:+SSLv2:@STRENGTH. This must be the first
	   cipher string specified.

       ALL all ciphers suites except the eNULL ciphers which must be
	   explicitly enabled.

       HIGH
	   "high" encryption cipher suites. This currently means those with
	   key lengths larger than 128 bits.

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

       LOW "low" encryption cipher suites, currently those using 64 or 56 bit
	   encryption algorithms but excluding export cipher suites.

       EXP, EXPORT
	   export encryption algorithms. Including 40 and 56 bits algorithms.

       EXPORT40
	   40 bit export encryption algorithms

       EXPORT56
	   56 bit export encryption algorithms.

       eNULL, NULL
	   the "NULL" ciphers that is those offering no encryption. Because
	   these offer no encryption at all and are a security risk they are
	   disabled unless explicitly included.

       aNULL
	   the cipher suites offering no authentication. This is currently the
	   anonymous DH algorithms. These cipher suites are vulnerable to a
	   "man in the middle" attack and so their use is normally
	   discouraged.

       kRSA, RSA
	   cipher suites using RSA key exchange.

       kEDH
	   cipher suites using ephemeral DH key agreement.

       kDHr, kDHd
	   cipher suites using DH key agreement and DH certificates signed by
	   CAs with RSA and DSS keys respectively. Not implemented.

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

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

       aDH cipher suites effectively using DH authentication, i.e. the
	   certificates carry DH keys.	Not implemented.

       kFZA, aFZA, eFZA, FZA
	   ciphers suites using FORTEZZA key exchange, authentication,
	   encryption or all FORTEZZA algorithms. Not implemented.

       TLSv1, SSLv3, SSLv2
	   TLS v1.0, SSL v3.0 or SSL v2.0 cipher suites respectively.

       DH  cipher suites using DH, including anonymous DH.

       ADH anonymous DH cipher suites.

       3DES
	   cipher suites using triple DES.

       DES cipher suites using DES (not triple DES).

       RC4 cipher suites using RC4.

       RC2 cipher suites using RC2.

       IDEA
	   cipher suites using IDEA.

       MD5 cipher suites using MD5.

       SHA1, SHA
	   cipher suites using SHA1.

CIPHER SUITE NAMES
       The following lists give the SSL or TLS cipher suites names from the
       relevant specification and their OpenSSL equivalents.

       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_EXPORT_WITH_DES40_CBC_SHA	Not implemented.
	SSL_DH_DSS_WITH_DES_CBC_SHA		Not implemented.
	SSL_DH_DSS_WITH_3DES_EDE_CBC_SHA	Not implemented.
	SSL_DH_RSA_EXPORT_WITH_DES40_CBC_SHA	Not implemented.
	SSL_DH_RSA_WITH_DES_CBC_SHA		Not implemented.
	SSL_DH_RSA_WITH_3DES_EDE_CBC_SHA	Not implemented.
	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.

       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

       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

       SSL v2.0 cipher suites.

	SSL_CK_RC4_128_WITH_MD5			RC4-MD5
	SSL_CK_RC4_128_EXPORT40_WITH_MD5	EXP-RC4-MD5
	SSL_CK_RC2_128_CBC_WITH_MD5		RC2-MD5
	SSL_CK_RC2_128_CBC_EXPORT40_WITH_MD5	EXP-RC2-MD5
	SSL_CK_IDEA_128_CBC_WITH_MD5		IDEA-CBC-MD5
	SSL_CK_DES_64_CBC_WITH_MD5		DES-CBC-MD5
	SSL_CK_DES_192_EDE3_CBC_WITH_MD5	DES-CBC3-MD5

NOTES
       The non-ephemeral DH modes are currently unimplemented in OpenSSL
       because there is no support for DH certificates.

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

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 only 3DES ciphers and then place RSA ciphers last:

	openssl ciphers -v '3DES:+RSA'

SEE ALSO
       s_client(1), s_server(1), ssl(3)

3rd Berkeley Distribution	    0.9.6m			    CIPHERS(1)
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