priority strings behavior

[ben thielsen]

hi-

i'm experimenting a bit with setting specific priority strings.  i've been reading some of the documentation, namely gnutls.pdf from http://www.gnu.org/software/gnutls/documentation.html and man 1 gnutls-cli, but i think some of the nuances are escaping me.  i get the feeling that specifying certain things [specifically, cipher suites] will inherently also enable other certain things - is this true?  are the cipher suites just shorthand methods for enabling multiple other specific things at once?  is there somewhere documented which settings turn on other settings, and what they are?

more specifically, i'd like to enable only the following:

protocols:
TLS1.2
TLS1.1

certificate types:
X.509
OPENPGP

ciphers:
AES-256-CBC
CAMELLIA-256-CBC

macs:
SHA512

key exchange methods:
RSA DHE-DSS
DHE-RSA
DHE-PSK
SRP
SRP-DSS
SRP-RSA
PSK

public key algorithms:
RSA
DSA

public key signature algorithms:
SIGN-RSA-SHA512
SIGN-DSA-SHA256

compression:
DEFLATE
NULL

but - given the output of gnutls-cli --list:

>gnutls-cli --list
Cipher suites:
TLS_ANON_DH_ARCFOUR_MD5                           	0x00, 0x18	SSL3.0
TLS_ANON_DH_3DES_EDE_CBC_SHA1                     	0x00, 0x1b	SSL3.0
TLS_ANON_DH_AES_128_CBC_SHA1                      	0x00, 0x34	SSL3.0
TLS_ANON_DH_AES_256_CBC_SHA1                      	0x00, 0x3a	SSL3.0
TLS_ANON_DH_CAMELLIA_128_CBC_SHA1                 	0x00, 0x46	TLS1.0
TLS_ANON_DH_CAMELLIA_256_CBC_SHA1                 	0x00, 0x89	TLS1.0
TLS_PSK_SHA_ARCFOUR_SHA1                          	0x00, 0x8a	TLS1.0
TLS_PSK_SHA_3DES_EDE_CBC_SHA1                     	0x00, 0x8b	TLS1.0
TLS_PSK_SHA_AES_128_CBC_SHA1                      	0x00, 0x8c	TLS1.0
TLS_PSK_SHA_AES_256_CBC_SHA1                      	0x00, 0x8d	TLS1.0
TLS_DHE_PSK_SHA_ARCFOUR_SHA1                      	0x00, 0x8e	TLS1.0
TLS_DHE_PSK_SHA_3DES_EDE_CBC_SHA1                 	0x00, 0x8f	TLS1.0
TLS_DHE_PSK_SHA_AES_128_CBC_SHA1                  	0x00, 0x90	TLS1.0
TLS_DHE_PSK_SHA_AES_256_CBC_SHA1                  	0x00, 0x91	TLS1.0
TLS_SRP_SHA_3DES_EDE_CBC_SHA1                     	0xc0, 0x1a	TLS1.0
TLS_SRP_SHA_AES_128_CBC_SHA1                      	0xc0, 0x1d	TLS1.0
TLS_SRP_SHA_AES_256_CBC_SHA1                      	0xc0, 0x20	TLS1.0
TLS_SRP_SHA_DSS_3DES_EDE_CBC_SHA1                 	0xc0, 0x1c	TLS1.0
TLS_SRP_SHA_RSA_3DES_EDE_CBC_SHA1                 	0xc0, 0x1b	TLS1.0
TLS_SRP_SHA_DSS_AES_128_CBC_SHA1                  	0xc0, 0x1f	TLS1.0
TLS_SRP_SHA_RSA_AES_128_CBC_SHA1                  	0xc0, 0x1e	TLS1.0
TLS_SRP_SHA_DSS_AES_256_CBC_SHA1                  	0xc0, 0x22	TLS1.0
TLS_SRP_SHA_RSA_AES_256_CBC_SHA1                  	0xc0, 0x21	TLS1.0
TLS_DHE_DSS_ARCFOUR_SHA1                          	0x00, 0x66	TLS1.0
TLS_DHE_DSS_3DES_EDE_CBC_SHA1                     	0x00, 0x13	SSL3.0
TLS_DHE_DSS_AES_128_CBC_SHA1                      	0x00, 0x32	SSL3.0
TLS_DHE_DSS_AES_256_CBC_SHA1                      	0x00, 0x38	SSL3.0
TLS_DHE_DSS_CAMELLIA_128_CBC_SHA1                 	0x00, 0x44	TLS1.0
TLS_DHE_DSS_CAMELLIA_256_CBC_SHA1                 	0x00, 0x87	TLS1.0
TLS_DHE_RSA_3DES_EDE_CBC_SHA1                     	0x00, 0x16	SSL3.0
TLS_DHE_RSA_AES_128_CBC_SHA1                      	0x00, 0x33	SSL3.0
TLS_DHE_RSA_AES_256_CBC_SHA1                      	0x00, 0x39	SSL3.0
TLS_DHE_RSA_CAMELLIA_128_CBC_SHA1                 	0x00, 0x45	TLS1.0
TLS_DHE_RSA_CAMELLIA_256_CBC_SHA1                 	0x00, 0x88	TLS1.0
TLS_RSA_NULL_MD5                                  	0x00, 0x01	SSL3.0
TLS_RSA_EXPORT_ARCFOUR_40_MD5                     	0x00, 0x03	SSL3.0
TLS_RSA_ARCFOUR_SHA1                              	0x00, 0x05	SSL3.0
TLS_RSA_ARCFOUR_MD5                               	0x00, 0x04	SSL3.0
TLS_RSA_3DES_EDE_CBC_SHA1                         	0x00, 0x0a	SSL3.0
TLS_RSA_AES_128_CBC_SHA1                          	0x00, 0x2f	SSL3.0
TLS_RSA_AES_256_CBC_SHA1                          	0x00, 0x35	SSL3.0
TLS_RSA_CAMELLIA_128_CBC_SHA1                     	0x00, 0x41	TLS1.0
TLS_RSA_CAMELLIA_256_CBC_SHA1                     	0x00, 0x84	TLS1.0
Certificate types: X.509, OPENPGP
Protocols: SSL3.0, TLS1.0, TLS1.1, TLS1.2
Ciphers: AES-256-CBC, AES-128-CBC, 3DES-CBC, DES-CBC, ARCFOUR-128, ARCFOUR-40, RC2-40, CAMELLIA-256-CBC, CAMELLIA-128-CBC, NULL
MACs: SHA1, MD5, SHA256, SHA384, SHA512, MD2, RIPEMD160, NULL
Key exchange algorithms: ANON-DH, RSA, RSA-EXPORT, DHE-RSA, DHE-DSS, SRP-DSS, SRP-RSA, SRP, PSK, DHE-PSK
Compression: DEFLATE, NULL
Public Key Systems: RSA, DSA
PK-signatures: RSA-SHA, RSA-SHA256, RSA-SHA384, RSA-SHA512, RSA-RMD160, DSA-SHA, RSA-MD5, RSA-MD2

...it seems like there's some contradiction between the list of cipher suites and the list of MACs?  i can somehow use sha512, but none of the cipher suites can?

this particular instance is older:
>gnutls-cli -v
gnutls-cli (GnuTLS) 2.8.6

...and i see here 

http://www.gnu.org/software/gnutls/manual/html_node/All-the-supported-ciphersuites-in-GnuTLS.html#ciphersuites

that there appear to be some sha2 algorithms listed in the ciphersuites for perhaps newer versions - but even then, no 512 - just 256?

thanks
-ben