crypto: drbg - Use Kconfig to ensure at least one RNG option is set

This patch removes the build-time test that ensures at least one RNG
is set.  Instead we will simply not build drbg if no options are set
through Kconfig.

This also fixes a typo in the name of the Kconfig option CRYTPO_DRBG
(should be CRYPTO_DRBG).

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/crypto/Kconfig b/crypto/Kconfig
index 1dca374..6345c47 100644 (file)
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -23,7 +23,7 @@ comment "Crypto core or helper"
 
 config CRYPTO_FIPS
        bool "FIPS 200 compliance"
-       depends on (CRYPTO_ANSI_CPRNG || CRYTPO_DRBG) && !CRYPTO_MANAGER_DISABLE_TESTS
+       depends on (CRYPTO_ANSI_CPRNG || CRYPTO_DRBG) && !CRYPTO_MANAGER_DISABLE_TESTS
        depends on MODULE_SIG
        help
          This options enables the fips boot option which is
@@ -1394,39 +1394,39 @@ config CRYPTO_ANSI_CPRNG
          ANSI X9.31 A.2.4. Note that this option must be enabled if
          CRYPTO_FIPS is selected
 
-menuconfig CRYTPO_DRBG
+menuconfig CRYPTO_DRBG_MENU
        tristate "NIST SP800-90A DRBG"
-       depends on CRYPTO
-       select CRYPTO_RNG
        help
          NIST SP800-90A compliant DRBG. In the following submenu, one or
          more of the DRBG types must be selected.
 
-if CRYTPO_DRBG
+if CRYPTO_DRBG_MENU
 
 config CRYPTO_DRBG_HMAC
        bool "Enable HMAC DRBG"
        default y
-       depends on CRYTPO_DRBG
        select CRYPTO_HMAC
        help
          Enable the HMAC DRBG variant as defined in NIST SP800-90A.
 
 config CRYPTO_DRBG_HASH
        bool "Enable Hash DRBG"
-       depends on CRYTPO_DRBG
        select CRYPTO_HASH
        help
          Enable the Hash DRBG variant as defined in NIST SP800-90A.
 
 config CRYPTO_DRBG_CTR
        bool "Enable CTR DRBG"
-       depends on CRYTPO_DRBG
        select CRYPTO_AES
        help
          Enable the CTR DRBG variant as defined in NIST SP800-90A.
 
-endif #CRYTPO_DRBG
+config CRYPTO_DRBG
+       tristate
+       default CRYPTO_DRBG_MENU if (CRYPTO_DRBG_HMAC || CRYPTO_DRBG_HASH || CRYPTO_DRBG_CTR)
+       select CRYPTO_RNG
+
+endif  # if CRYPTO_DRBG_MENU
 
 config CRYPTO_USER_API
        tristate

diff --git a/crypto/Makefile b/crypto/Makefile
index bfa94fa..cfa57b3 100644 (file)
--- a/crypto/Makefile
+++ b/crypto/Makefile
@@ -92,7 +92,7 @@ obj-$(CONFIG_CRYPTO_842) += 842.o
 obj-$(CONFIG_CRYPTO_RNG2) += rng.o
 obj-$(CONFIG_CRYPTO_RNG2) += krng.o
 obj-$(CONFIG_CRYPTO_ANSI_CPRNG) += ansi_cprng.o
-obj-$(CONFIG_CRYTPO_DRBG) += drbg.o
+obj-$(CONFIG_CRYPTO_DRBG) += drbg.o
 obj-$(CONFIG_CRYPTO_TEST) += tcrypt.o
 obj-$(CONFIG_CRYPTO_GHASH) += ghash-generic.o
 obj-$(CONFIG_CRYPTO_USER_API) += af_alg.o

diff --git a/crypto/drbg.c b/crypto/drbg.c
index d6621a6..acc7523 100644 (file)
--- a/crypto/drbg.c
+++ b/crypto/drbg.c
@@ -99,12 +99,6 @@
 
 #include <crypto/drbg.h>
 
-#if !defined(CONFIG_CRYPTO_DRBG_HASH) && \
-       !defined(CONFIG_CRYPTO_DRBG_HMAC) && \
-       !defined(CONFIG_CRYPTO_DRBG_CTR)
-#warning "The DRBG code is useless without compiling at least one DRBG type"
-#endif
-
 /***************************************************************
  * Backend cipher definitions available to DRBG
  ***************************************************************/