crypto: rng - Make DRBG the default RNG

This patch creates a new invisible Kconfig option CRYPTO_RNG_DEFAULT
that simply selects the DRBG.  This new option is then selected
by the IV generators.

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

diff --git a/crypto/Kconfig b/crypto/Kconfig
index 91018d9..cb7806f 100644 (file)
--- a/crypto/Kconfig
+++ b/crypto/Kconfig
@@ -78,6 +78,10 @@ config CRYPTO_RNG2
        tristate
        select CRYPTO_ALGAPI2
 
+config CRYPTO_RNG_DEFAULT
+       tristate
+       select CRYPTO_DRBG_MENU
+
 config CRYPTO_PCOMP
        tristate
        select CRYPTO_PCOMP2
@@ -234,7 +238,7 @@ config CRYPTO_SEQIV
        select CRYPTO_AEAD
        select CRYPTO_BLKCIPHER
        select CRYPTO_NULL
-       select CRYPTO_RNG
+       select CRYPTO_RNG_DEFAULT
        help
          This IV generator generates an IV based on a sequence number by
          xoring it with a salt.  This algorithm is mainly useful for CTR
@@ -243,7 +247,7 @@ config CRYPTO_ECHAINIV
        tristate "Encrypted Chain IV Generator"
        select CRYPTO_AEAD
        select CRYPTO_NULL
-       select CRYPTO_RNG
+       select CRYPTO_RNG_DEFAULT
        default m
        help
          This IV generator generates an IV based on the encryption of
@@ -1484,7 +1488,6 @@ comment "Random Number Generation"
 
 config CRYPTO_ANSI_CPRNG
        tristate "Pseudo Random Number Generation for Cryptographic modules"
-       default m
        select CRYPTO_AES
        select CRYPTO_RNG
        help
@@ -1502,11 +1505,9 @@ menuconfig CRYPTO_DRBG_MENU
 if CRYPTO_DRBG_MENU
 
 config CRYPTO_DRBG_HMAC
-       bool "Enable HMAC DRBG"
+       bool
        default y
        select CRYPTO_HMAC
-       help
-         Enable the HMAC DRBG variant as defined in NIST SP800-90A.
 
 config CRYPTO_DRBG_HASH
        bool "Enable Hash DRBG"
@@ -1522,7 +1523,7 @@ config CRYPTO_DRBG_CTR
 
 config CRYPTO_DRBG
        tristate
-       default CRYPTO_DRBG_MENU if (CRYPTO_DRBG_HMAC || CRYPTO_DRBG_HASH || CRYPTO_DRBG_CTR)
+       default CRYPTO_DRBG_MENU
        select CRYPTO_RNG
        select CRYPTO_JITTERENTROPY