cfg80211: select CRYPTO_SHA256 if needed

When regulatory database certificates are built-in, they're
currently using the SHA256 digest algorithm, so add that to
the build in that case.

Also add a note that for custom certificates, one may need
to add the right algorithms.

Reported-by: Florian Fainelli <f.fainelli@gmail.com>
Tested-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/net/wireless/Kconfig b/net/wireless/Kconfig
index da91bb547db3e7ec2ddcf7526d56821bfe46b6f5..1abcc4fc4df18e81df5cfb072e81ce6970f5e6bc 100644 (file)
--- a/net/wireless/Kconfig
+++ b/net/wireless/Kconfig
@@ -20,6 +20,10 @@ config CFG80211
        tristate "cfg80211 - wireless configuration API"
        depends on RFKILL || !RFKILL
        select FW_LOADER
+       # may need to update this when certificates are changed and are
+       # using a different algorithm, though right now they shouldn't
+       # (this is here rather than below to allow it to be a module)
+       select CRYPTO_SHA256 if CFG80211_USE_KERNEL_REGDB_KEYS
        ---help---
          cfg80211 is the Linux wireless LAN (802.11) configuration API.
          Enable this if you have a wireless device.
@@ -113,6 +117,9 @@ config CFG80211_EXTRA_REGDB_KEYDIR
          certificates like in the kernel sources (net/wireless/certs/)
          that shall be accepted for a signed regulatory database.
 
+         Note that you need to also select the correct CRYPTO_<hash> modules
+         for your certificates, and if cfg80211 is built-in they also must be.
+
 config CFG80211_REG_CELLULAR_HINTS
        bool "cfg80211 regulatory support for cellular base station hints"
        depends on CFG80211_CERTIFICATION_ONUS