[PATCH v2 08/15] crypto: arm64/sm4 - export reusable CE acceleration functions

[Tianjia Zhang]

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@xxxxxxxxxxxxxxxxx>
---
 arch/arm64/crypto/sm4-ce-glue.c |  5 +++++
 arch/arm64/crypto/sm4-ce.h      | 16 ++++++++++++++++
 2 files changed, 21 insertions(+)
 create mode 100644 arch/arm64/crypto/sm4-ce.h

diff --git a/arch/arm64/crypto/sm4-ce-glue.c b/arch/arm64/crypto/sm4-ce-glue.c
index ff2d8442d473..63abcadc684b 100644
--- a/arch/arm64/crypto/sm4-ce-glue.c
+++ b/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)
 {
diff --git a/arch/arm64/crypto/sm4-ce.h b/arch/arm64/crypto/sm4-ce.h
new file mode 100644
index 000000000000..109c21b37590
--- /dev/null
+++ b/arch/arm64/crypto/sm4-ce.h
@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * SM4 common functions for Crypto Extensions
+ * Copyright (C) 2022 Tianjia Zhang <tianjia.zhang@xxxxxxxxxxxxxxxxx>
+ */
+
+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);
-- 
2.24.3 (Apple Git-128)