crypto: ansi_cprng - Remove unused ansi_cprng algorithm

Remove ansi_cprng, since it's obsolete and unused, as confirmed at
https://lore.kernel.org/r/aQxpnckYMgAAOLpZ@gondor.apana.org.au/

This was originally added in 2008, apparently as a FIPS approved random
number generator.  Whether this has ever belonged upstream is
questionable.  Either way, ansi_cprng is no longer usable for this
purpose, since it's been superseded by the more modern algorithms in
crypto/drbg.c, and FIPS itself no longer allows it.  (NIST SP 800-131A
Rev 1 (2015) says that RNGs based on ANSI X9.31 will be disallowed after
2015.  NIST SP 800-131A Rev 2 (2019) confirms they are now disallowed.)

Therefore, there is no reason to keep it around.

Suggested-by: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Haotian Zhang <vulab@iscas.ac.cn>
Cc: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: Eric Biggers <ebiggers@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

Documentation/crypto/userspace-if.rst

@@ -302,10 +302,9 @@ follows:
 
 
 Depending on the RNG type, the RNG must be seeded. The seed is provided
-using the setsockopt interface to set the key. For example, the
-ansi_cprng requires a seed. The DRBGs do not require a seed, but may be
-seeded. The seed is also known as a *Personalization String* in NIST SP 800-90A
-standard.
+using the setsockopt interface to set the key. The SP800-90A DRBGs do
+not require a seed, but may be seeded. The seed is also known as a
+*Personalization String* in NIST SP 800-90A standard.
 
 Using the read()/recvmsg() system calls, random numbers can be obtained.
 The kernel generates at most 128 bytes in one call. If user space

MAINTAINERS

@@ -6605,7 +6605,6 @@ CRYPTOGRAPHIC RANDOM NUMBER GENERATOR
 M:	Neil Horman <nhorman@tuxdriver.com>
 L:	linux-crypto@vger.kernel.org
 S:	Maintained
-F:	crypto/ansi_cprng.c
 F:	crypto/rng.c
 
 CS3308 MEDIA DRIVER

arch/arm/configs/axm55xx_defconfig

@@ -233,4 +233,3 @@ CONFIG_RCU_CPU_STALL_TIMEOUT=60
 CONFIG_DEBUG_USER=y
 CONFIG_CRYPTO_GCM=y
 CONFIG_CRYPTO_SHA256=y
-# CONFIG_CRYPTO_ANSI_CPRNG is not set

arch/arm/configs/clps711x_defconfig

@@ -75,5 +75,4 @@ CONFIG_MINIX_FS=y
 CONFIG_DEBUG_USER=y
 CONFIG_DEBUG_LL=y
 CONFIG_EARLY_PRINTK=y
-# CONFIG_CRYPTO_ANSI_CPRNG is not set
 # CONFIG_CRYPTO_HW is not set

arch/arm/configs/dove_defconfig

@@ -126,7 +126,6 @@ CONFIG_CRYPTO_SHA256=y
 CONFIG_CRYPTO_SHA512=y
 CONFIG_CRYPTO_DEFLATE=y
 CONFIG_CRYPTO_LZO=y
-# CONFIG_CRYPTO_ANSI_CPRNG is not set
 CONFIG_CRYPTO_DEV_MARVELL_CESA=y
 CONFIG_PRINTK_TIME=y
 # CONFIG_DEBUG_BUGVERBOSE is not set

arch/arm/configs/ep93xx_defconfig

@@ -119,4 +119,3 @@ CONFIG_DEBUG_SPINLOCK=y
 CONFIG_DEBUG_MUTEXES=y
 CONFIG_DEBUG_USER=y
 CONFIG_DEBUG_LL=y
-# CONFIG_CRYPTO_ANSI_CPRNG is not set

arch/arm/configs/jornada720_defconfig

@@ -92,4 +92,3 @@ CONFIG_NLS_UTF8=m
 CONFIG_DEBUG_KERNEL=y
 # CONFIG_FTRACE is not set
 CONFIG_DEBUG_LL=y
-# CONFIG_CRYPTO_ANSI_CPRNG is not set

arch/arm/configs/keystone_defconfig

@@ -228,7 +228,6 @@ CONFIG_CRYPTO_DES=y
 CONFIG_CRYPTO_CBC=y
 CONFIG_CRYPTO_CTR=y
 CONFIG_CRYPTO_XCBC=y
-CONFIG_CRYPTO_ANSI_CPRNG=y
 CONFIG_CRYPTO_USER_API_HASH=y
 CONFIG_CRYPTO_USER_API_SKCIPHER=y
 CONFIG_DMA_CMA=y

arch/arm/configs/lpc32xx_defconfig

@@ -177,7 +177,6 @@ CONFIG_NLS_CODEPAGE_437=y
 CONFIG_NLS_ASCII=y
 CONFIG_NLS_ISO8859_1=y
 CONFIG_NLS_UTF8=y
-CONFIG_CRYPTO_ANSI_CPRNG=y
 # CONFIG_CRYPTO_HW is not set
 CONFIG_PRINTK_TIME=y
 CONFIG_DYNAMIC_DEBUG=y

arch/arm/configs/mmp2_defconfig

@@ -78,4 +78,3 @@ CONFIG_DEBUG_USER=y
 CONFIG_DEBUG_LL=y
 CONFIG_DEBUG_MMP_UART3=y
 CONFIG_EARLY_PRINTK=y
-# CONFIG_CRYPTO_ANSI_CPRNG is not set

arch/arm/configs/mv78xx0_defconfig

@@ -121,4 +121,3 @@ CONFIG_DEBUG_KERNEL=y
 CONFIG_SCHEDSTATS=y
 CONFIG_DEBUG_USER=y
 CONFIG_DEBUG_LL=y
-# CONFIG_CRYPTO_ANSI_CPRNG is not set

arch/arm/configs/omap1_defconfig

@@ -220,7 +220,6 @@ CONFIG_CRYPTO_ECB=y
 CONFIG_CRYPTO_PCBC=y
 CONFIG_CRYPTO_DEFLATE=y
 CONFIG_CRYPTO_LZO=y
-# CONFIG_CRYPTO_ANSI_CPRNG is not set
 CONFIG_FONTS=y
 CONFIG_FONT_8x8=y
 CONFIG_FONT_8x16=y

arch/arm/configs/orion5x_defconfig

@@ -145,4 +145,3 @@ CONFIG_LATENCYTOP=y
 # CONFIG_FTRACE is not set
 CONFIG_DEBUG_USER=y
 CONFIG_DEBUG_LL=y
-# CONFIG_CRYPTO_ANSI_CPRNG is not set

arch/arm/configs/pxa168_defconfig

@@ -48,4 +48,3 @@ CONFIG_MAGIC_SYSRQ=y
 # CONFIG_DEBUG_PREEMPT is not set
 CONFIG_DEBUG_USER=y
 CONFIG_DEBUG_LL=y
-# CONFIG_CRYPTO_ANSI_CPRNG is not set

arch/arm/configs/pxa3xx_defconfig

@@ -106,5 +106,4 @@ CONFIG_DEBUG_SPINLOCK=y
 CONFIG_DEBUG_SPINLOCK_SLEEP=y
 # CONFIG_FTRACE is not set
 CONFIG_DEBUG_USER=y
-# CONFIG_CRYPTO_ANSI_CPRNG is not set
 # CONFIG_CRYPTO_HW is not set

arch/arm/configs/pxa910_defconfig

@@ -59,4 +59,3 @@ CONFIG_DEBUG_USER=y
 CONFIG_DEBUG_LL=y
 CONFIG_DEBUG_MMP_UART2=y
 CONFIG_EARLY_PRINTK=y
-# CONFIG_CRYPTO_ANSI_CPRNG is not set

arch/arm/configs/spitz_defconfig

@@ -228,7 +228,6 @@ CONFIG_CRYPTO_KHAZAD=m
 CONFIG_CRYPTO_SERPENT=m
 CONFIG_CRYPTO_TEA=m
 CONFIG_CRYPTO_TWOFISH=m
-# CONFIG_CRYPTO_ANSI_CPRNG is not set
 CONFIG_CRYPTO_HMAC=y
 CONFIG_CRYPTO_MD4=m
 CONFIG_CRYPTO_MICHAEL_MIC=m

arch/arm64/configs/defconfig

@@ -1783,7 +1783,6 @@ CONFIG_CRYPTO_CHACHA20=m
 CONFIG_CRYPTO_BENCHMARK=m
 CONFIG_CRYPTO_ECHAINIV=y
 CONFIG_CRYPTO_MICHAEL_MIC=m
-CONFIG_CRYPTO_ANSI_CPRNG=y
 CONFIG_CRYPTO_USER_API_RNG=m
 CONFIG_CRYPTO_GHASH_ARM64_CE=y
 CONFIG_CRYPTO_SHA3_ARM64=m

arch/hexagon/configs/comet_defconfig

@@ -70,7 +70,6 @@ CONFIG_INET=y
 # CONFIG_INET_DIAG is not set
 # CONFIG_IPV6 is not set
 CONFIG_CRYPTO_MD5=y
-# CONFIG_CRYPTO_ANSI_CPRNG is not set
 # CONFIG_CRYPTO_HW is not set
 CONFIG_FRAME_WARN=0
 CONFIG_MAGIC_SYSRQ=y

arch/m68k/configs/amcore_defconfig

@@ -86,5 +86,4 @@ CONFIG_PANIC_ON_OOPS=y
 # CONFIG_SCHED_DEBUG is not set
 # CONFIG_DEBUG_BUGVERBOSE is not set
 # CONFIG_CRYPTO_ECHAINIV is not set
-CONFIG_CRYPTO_ANSI_CPRNG=y
 # CONFIG_CRYPTO_HW is not set