crypto: remove cipher routines from public crypto API

The cipher routines in the crypto API are mostly intended for templates
implementing skcipher modes generically in software, and shouldn't be
used outside of the crypto subsystem. So move the prototypes and all
related definitions to a new header file under include/crypto/internal.
Also, let's use the new module namespace feature to move the symbol
exports into a new namespace CRYPTO_INTERNAL.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>

Documentation/crypto/api-skcipher.rst

@@ -28,8 +28,8 @@ Symmetric Key Cipher Request Handle
 Single Block Cipher API
 -----------------------
 
-.. kernel-doc:: include/linux/crypto.h
+.. kernel-doc:: include/crypto/internal/cipher.h
    :doc: Single Block Cipher API
 
-.. kernel-doc:: include/linux/crypto.h
+.. kernel-doc:: include/crypto/internal/cipher.h
    :functions: crypto_alloc_cipher crypto_free_cipher crypto_has_cipher crypto_cipher_blocksize crypto_cipher_setkey crypto_cipher_encrypt_one crypto_cipher_decrypt_one

arch/arm/crypto/aes-neonbs-glue.c

@@ -9,6 +9,7 @@
 #include <asm/simd.h>
 #include <crypto/aes.h>
 #include <crypto/ctr.h>
+#include <crypto/internal/cipher.h>
 #include <crypto/internal/simd.h>
 #include <crypto/internal/skcipher.h>
 #include <crypto/scatterwalk.h>
@@ -23,6 +24,8 @@ MODULE_ALIAS_CRYPTO("cbc(aes)-all");
 MODULE_ALIAS_CRYPTO("ctr(aes)");
 MODULE_ALIAS_CRYPTO("xts(aes)");
 
+MODULE_IMPORT_NS(CRYPTO_INTERNAL);
+
 asmlinkage void aesbs_convert_key(u8 out[], u32 const rk[], int rounds);
 
 asmlinkage void aesbs_ecb_encrypt(u8 out[], u8 const in[], u8 const rk[],

arch/s390/crypto/aes_s390.c

@@ -21,6 +21,7 @@
 #include <crypto/algapi.h>
 #include <crypto/ghash.h>
 #include <crypto/internal/aead.h>
+#include <crypto/internal/cipher.h>
 #include <crypto/internal/skcipher.h>
 #include <crypto/scatterwalk.h>
 #include <linux/err.h>
@@ -1055,3 +1056,4 @@ MODULE_ALIAS_CRYPTO("aes-all");
 
 MODULE_DESCRIPTION("Rijndael (AES) Cipher Algorithm");
 MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS(CRYPTO_INTERNAL);

crypto/adiantum.c

@@ -32,6 +32,7 @@
 
 #include <crypto/b128ops.h>
 #include <crypto/chacha.h>
+#include <crypto/internal/cipher.h>
 #include <crypto/internal/hash.h>
 #include <crypto/internal/poly1305.h>
 #include <crypto/internal/skcipher.h>
@@ -616,3 +617,4 @@ MODULE_DESCRIPTION("Adiantum length-preserving encryption mode");
 MODULE_LICENSE("GPL v2");
 MODULE_AUTHOR("Eric Biggers <ebiggers@google.com>");
 MODULE_ALIAS_CRYPTO("adiantum");
+MODULE_IMPORT_NS(CRYPTO_INTERNAL);

crypto/ansi_cprng.c

@@ -7,6 +7,7 @@
  *  (C) Neil Horman <nhorman@tuxdriver.com>
  */
 
+#include <crypto/internal/cipher.h>
 #include <crypto/internal/rng.h>
 #include <linux/err.h>
 #include <linux/init.h>
@@ -470,3 +471,4 @@ subsys_initcall(prng_mod_init);
 module_exit(prng_mod_fini);
 MODULE_ALIAS_CRYPTO("stdrng");
 MODULE_ALIAS_CRYPTO("ansi_cprng");
+MODULE_IMPORT_NS(CRYPTO_INTERNAL);

crypto/cbc.c

@@ -6,6 +6,7 @@
  */
 
 #include <crypto/algapi.h>
+#include <crypto/internal/cipher.h>
 #include <crypto/internal/skcipher.h>
 #include <linux/err.h>
 #include <linux/init.h>

crypto/ccm.c

@@ -6,6 +6,7 @@
  */
 
 #include <crypto/internal/aead.h>
+#include <crypto/internal/cipher.h>
 #include <crypto/internal/hash.h>
 #include <crypto/internal/skcipher.h>
 #include <crypto/scatterwalk.h>
@@ -954,3 +955,4 @@ MODULE_ALIAS_CRYPTO("ccm_base");
 MODULE_ALIAS_CRYPTO("rfc4309");
 MODULE_ALIAS_CRYPTO("ccm");
 MODULE_ALIAS_CRYPTO("cbcmac");
+MODULE_IMPORT_NS(CRYPTO_INTERNAL);

crypto/cfb.c

@@ -20,6 +20,7 @@
  */
 
 #include <crypto/algapi.h>
+#include <crypto/internal/cipher.h>
 #include <crypto/internal/skcipher.h>
 #include <linux/err.h>
 #include <linux/init.h>
@@ -250,3 +251,4 @@ module_exit(crypto_cfb_module_exit);
 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("CFB block cipher mode of operation");
 MODULE_ALIAS_CRYPTO("cfb");
+MODULE_IMPORT_NS(CRYPTO_INTERNAL);

crypto/cipher.c

@@ -9,6 +9,7 @@
  */
 
 #include <crypto/algapi.h>
+#include <crypto/internal/cipher.h>
 #include <linux/kernel.h>
 #include <linux/crypto.h>
 #include <linux/errno.h>
@@ -53,7 +54,7 @@ int crypto_cipher_setkey(struct crypto_cipher *tfm,
 
 	return cia->cia_setkey(crypto_cipher_tfm(tfm), key, keylen);
 }
-EXPORT_SYMBOL_GPL(crypto_cipher_setkey);
+EXPORT_SYMBOL_NS_GPL(crypto_cipher_setkey, CRYPTO_INTERNAL);
 
 static inline void cipher_crypt_one(struct crypto_cipher *tfm,
 				    u8 *dst, const u8 *src, bool enc)
@@ -81,11 +82,11 @@ void crypto_cipher_encrypt_one(struct crypto_cipher *tfm,
 {
 	cipher_crypt_one(tfm, dst, src, true);
 }
-EXPORT_SYMBOL_GPL(crypto_cipher_encrypt_one);
+EXPORT_SYMBOL_NS_GPL(crypto_cipher_encrypt_one, CRYPTO_INTERNAL);
 
 void crypto_cipher_decrypt_one(struct crypto_cipher *tfm,
 			       u8 *dst, const u8 *src)
 {
 	cipher_crypt_one(tfm, dst, src, false);
 }
-EXPORT_SYMBOL_GPL(crypto_cipher_decrypt_one);
+EXPORT_SYMBOL_NS_GPL(crypto_cipher_decrypt_one, CRYPTO_INTERNAL);

crypto/cmac.c

@@ -11,6 +11,7 @@
  *   Author: Kazunori Miyazawa <miyazawa@linux-ipv6.org>
  */
 
+#include <crypto/internal/cipher.h>
 #include <crypto/internal/hash.h>
 #include <linux/err.h>
 #include <linux/kernel.h>
@@ -313,3 +314,4 @@ module_exit(crypto_cmac_module_exit);
 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("CMAC keyed hash algorithm");
 MODULE_ALIAS_CRYPTO("cmac");
+MODULE_IMPORT_NS(CRYPTO_INTERNAL);

crypto/ctr.c

@@ -7,6 +7,7 @@
 
 #include <crypto/algapi.h>
 #include <crypto/ctr.h>
+#include <crypto/internal/cipher.h>
 #include <crypto/internal/skcipher.h>
 #include <linux/err.h>
 #include <linux/init.h>
@@ -358,3 +359,4 @@ MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("CTR block cipher mode of operation");
 MODULE_ALIAS_CRYPTO("rfc3686");
 MODULE_ALIAS_CRYPTO("ctr");
+MODULE_IMPORT_NS(CRYPTO_INTERNAL);

crypto/drbg.c

@@ -98,6 +98,7 @@
  */
 
 #include <crypto/drbg.h>
+#include <crypto/internal/cipher.h>
 #include <linux/kernel.h>
 
 /***************************************************************
@@ -2161,3 +2162,4 @@ MODULE_DESCRIPTION("NIST SP800-90A Deterministic Random Bit Generator (DRBG) "
 		   CRYPTO_DRBG_HMAC_STRING
 		   CRYPTO_DRBG_CTR_STRING);
 MODULE_ALIAS_CRYPTO("stdrng");
+MODULE_IMPORT_NS(CRYPTO_INTERNAL);

crypto/ecb.c

@@ -6,6 +6,7 @@
  */
 
 #include <crypto/algapi.h>
+#include <crypto/internal/cipher.h>
 #include <crypto/internal/skcipher.h>
 #include <linux/err.h>
 #include <linux/init.h>

crypto/essiv.c

@@ -30,6 +30,7 @@
 
 #include <crypto/authenc.h>
 #include <crypto/internal/aead.h>
+#include <crypto/internal/cipher.h>
 #include <crypto/internal/hash.h>
 #include <crypto/internal/skcipher.h>
 #include <crypto/scatterwalk.h>
@@ -643,3 +644,4 @@ module_exit(essiv_module_exit);
 MODULE_DESCRIPTION("ESSIV skcipher/aead wrapper for block encryption");
 MODULE_LICENSE("GPL v2");
 MODULE_ALIAS_CRYPTO("essiv");
+MODULE_IMPORT_NS(CRYPTO_INTERNAL);

crypto/keywrap.c

@@ -85,6 +85,7 @@
 #include <linux/crypto.h>
 #include <linux/scatterlist.h>
 #include <crypto/scatterwalk.h>
+#include <crypto/internal/cipher.h>
 #include <crypto/internal/skcipher.h>
 
 struct crypto_kw_block {
@@ -316,3 +317,4 @@ MODULE_LICENSE("Dual BSD/GPL");
 MODULE_AUTHOR("Stephan Mueller <smueller@chronox.de>");
 MODULE_DESCRIPTION("Key Wrapping (RFC3394 / NIST SP800-38F)");
 MODULE_ALIAS_CRYPTO("kw");
+MODULE_IMPORT_NS(CRYPTO_INTERNAL);

crypto/ofb.c

@@ -8,6 +8,7 @@
  */
 
 #include <crypto/algapi.h>
+#include <crypto/internal/cipher.h>
 #include <crypto/internal/skcipher.h>
 #include <linux/err.h>
 #include <linux/init.h>
@@ -102,3 +103,4 @@ module_exit(crypto_ofb_module_exit);
 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("OFB block cipher mode of operation");
 MODULE_ALIAS_CRYPTO("ofb");
+MODULE_IMPORT_NS(CRYPTO_INTERNAL);

crypto/pcbc.c

@@ -10,6 +10,7 @@
  */
 
 #include <crypto/algapi.h>
+#include <crypto/internal/cipher.h>
 #include <crypto/internal/skcipher.h>
 #include <linux/err.h>
 #include <linux/init.h>
@@ -191,3 +192,4 @@ module_exit(crypto_pcbc_module_exit);
 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("PCBC block cipher mode of operation");
 MODULE_ALIAS_CRYPTO("pcbc");
+MODULE_IMPORT_NS(CRYPTO_INTERNAL);

crypto/skcipher.c

@@ -10,6 +10,7 @@
  */
 
 #include <crypto/internal/aead.h>
+#include <crypto/internal/cipher.h>
 #include <crypto/internal/skcipher.h>
 #include <crypto/scatterwalk.h>
 #include <linux/bug.h>

crypto/testmgr.c

@@ -33,10 +33,13 @@
 #include <crypto/akcipher.h>
 #include <crypto/kpp.h>
 #include <crypto/acompress.h>
+#include <crypto/internal/cipher.h>
 #include <crypto/internal/simd.h>
 
 #include "internal.h"
 
+MODULE_IMPORT_NS(CRYPTO_INTERNAL);
+
 static bool notests;
 module_param(notests, bool, 0644);
 MODULE_PARM_DESC(notests, "disable crypto self-tests");

crypto/vmac.c

@@ -36,6 +36,7 @@
 #include <linux/scatterlist.h>
 #include <asm/byteorder.h>
 #include <crypto/scatterwalk.h>
+#include <crypto/internal/cipher.h>
 #include <crypto/internal/hash.h>
 
 /*
@@ -693,3 +694,4 @@ module_exit(vmac_module_exit);
 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("VMAC hash algorithm");
 MODULE_ALIAS_CRYPTO("vmac64");
+MODULE_IMPORT_NS(CRYPTO_INTERNAL);

crypto/xcbc.c

@@ -6,6 +6,7 @@
  * 	Kazunori Miyazawa <miyazawa@linux-ipv6.org>
  */
 
+#include <crypto/internal/cipher.h>
 #include <crypto/internal/hash.h>
 #include <linux/err.h>
 #include <linux/kernel.h>
@@ -272,3 +273,4 @@ module_exit(crypto_xcbc_module_exit);
 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("XCBC keyed hash algorithm");
 MODULE_ALIAS_CRYPTO("xcbc");
+MODULE_IMPORT_NS(CRYPTO_INTERNAL);

crypto/xts.c

@@ -7,6 +7,7 @@
  * Based on ecb.c
  * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
  */
+#include <crypto/internal/cipher.h>
 #include <crypto/internal/skcipher.h>
 #include <crypto/scatterwalk.h>
 #include <linux/err.h>
@@ -464,3 +465,4 @@ module_exit(xts_module_exit);
 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("XTS block cipher mode");
 MODULE_ALIAS_CRYPTO("xts");
+MODULE_IMPORT_NS(CRYPTO_INTERNAL);

drivers/crypto/geode-aes.c

@@ -10,6 +10,7 @@
 #include <linux/spinlock.h>
 #include <crypto/algapi.h>
 #include <crypto/aes.h>
+#include <crypto/internal/cipher.h>
 #include <crypto/internal/skcipher.h>
 
 #include <linux/io.h>
@@ -434,3 +435,4 @@ module_pci_driver(geode_aes_driver);
 MODULE_AUTHOR("Advanced Micro Devices, Inc.");
 MODULE_DESCRIPTION("Geode LX Hardware AES driver");
 MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS(CRYPTO_INTERNAL);

drivers/crypto/inside-secure/safexcel.c

@@ -1999,3 +1999,4 @@ MODULE_AUTHOR("Ofer Heifetz <oferh@marvell.com>");
 MODULE_AUTHOR("Igal Liberman <igall@marvell.com>");
 MODULE_DESCRIPTION("Support for SafeXcel cryptographic engines: EIP97 & EIP197");
 MODULE_LICENSE("GPL v2");
+MODULE_IMPORT_NS(CRYPTO_INTERNAL);

drivers/crypto/inside-secure/safexcel_hash.c

@@ -13,6 +13,7 @@
 #include <crypto/sha3.h>
 #include <crypto/skcipher.h>
 #include <crypto/sm3.h>
+#include <crypto/internal/cipher.h>
 #include <linux/device.h>
 #include <linux/dma-mapping.h>
 #include <linux/dmapool.h>

drivers/crypto/vmx/aes.c

@@ -14,6 +14,7 @@
 #include <asm/simd.h>
 #include <asm/switch_to.h>
 #include <crypto/aes.h>
+#include <crypto/internal/cipher.h>
 #include <crypto/internal/simd.h>
 
 #include "aesp8-ppc.h"

drivers/crypto/vmx/vmx.c

@@ -78,3 +78,4 @@ MODULE_DESCRIPTION("IBM VMX cryptographic acceleration instructions "
 		   "support on Power 8");
 MODULE_LICENSE("GPL");
 MODULE_VERSION("1.0.0");
+MODULE_IMPORT_NS(CRYPTO_INTERNAL);

include/crypto/algapi.h

@@ -189,45 +189,6 @@ static inline void *crypto_instance_ctx(struct crypto_instance *inst)
 	return inst->__ctx;
 }
 
-struct crypto_cipher_spawn {
-	struct crypto_spawn base;
-};
-
-static inline int crypto_grab_cipher(struct crypto_cipher_spawn *spawn,
-				     struct crypto_instance *inst,
-				     const char *name, u32 type, u32 mask)
-{
-	type &= ~CRYPTO_ALG_TYPE_MASK;
-	type |= CRYPTO_ALG_TYPE_CIPHER;
-	mask |= CRYPTO_ALG_TYPE_MASK;
-	return crypto_grab_spawn(&spawn->base, inst, name, type, mask);
-}
-
-static inline void crypto_drop_cipher(struct crypto_cipher_spawn *spawn)
-{
-	crypto_drop_spawn(&spawn->base);
-}
-
-static inline struct crypto_alg *crypto_spawn_cipher_alg(
-	struct crypto_cipher_spawn *spawn)
-{
-	return spawn->base.alg;
-}
-
-static inline struct crypto_cipher *crypto_spawn_cipher(
-	struct crypto_cipher_spawn *spawn)
-{
-	u32 type = CRYPTO_ALG_TYPE_CIPHER;
-	u32 mask = CRYPTO_ALG_TYPE_MASK;
-
-	return __crypto_cipher_cast(crypto_spawn_tfm(&spawn->base, type, mask));
-}
-
-static inline struct cipher_alg *crypto_cipher_alg(struct crypto_cipher *tfm)
-{
-	return &crypto_cipher_tfm(tfm)->__crt_alg->cra_cipher;
-}
-
 static inline struct crypto_async_request *crypto_get_backlog(
 	struct crypto_queue *queue)
 {