crypto: arm64/sm4 - export reusable CE acceleration functions

In the accelerated implementation of the SM4 algorithm using the Crypto
Extension instructions, there are some functions that can be reused in
the upcoming accelerated implementation of the GCM/CCM mode, and the
CBC/CFB encryption is reused in the optimized implementation of SVESM4.
Signed-off-by: Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

arch/arm64/crypto/sm4-ce-glue.c

@@ -36,6 +36,11 @@ asmlinkage void sm4_ce_cfb_dec(const u32 *rkey, u8 *dst, const u8 *src,
 asmlinkage void sm4_ce_ctr_enc(const u32 *rkey, u8 *dst, const u8 *src,
 			       u8 *iv, unsigned int nblks);
 
+EXPORT_SYMBOL(sm4_ce_expand_key);
+EXPORT_SYMBOL(sm4_ce_crypt_block);
+EXPORT_SYMBOL(sm4_ce_cbc_enc);
+EXPORT_SYMBOL(sm4_ce_cfb_enc);
+
 static int sm4_setkey(struct crypto_skcipher *tfm, const u8 *key,
 		      unsigned int key_len)
 {

arch/arm64/crypto/sm4-ce.h

+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * SM4 common functions for Crypto Extensions
+ * Copyright (C) 2022 Tianjia Zhang <tianjia.zhang@linux.alibaba.com>
+ */
+
+void sm4_ce_expand_key(const u8 *key, u32 *rkey_enc, u32 *rkey_dec,
+		       const u32 *fk, const u32 *ck);
+
+void sm4_ce_crypt_block(const u32 *rkey, u8 *dst, const u8 *src);
+
+void sm4_ce_cbc_enc(const u32 *rkey_enc, u8 *dst, const u8 *src,
+		    u8 *iv, unsigned int nblocks);
+
+void sm4_ce_cfb_enc(const u32 *rkey_enc, u8 *dst, const u8 *src,
+		    u8 *iv, unsigned int nblocks);