[PATCH 1/2] crypto: sm4 - export encrypt/decrypt routines to other drivers

[Ard Biesheuvel]

In preparation of adding support for the SIMD based arm64 implementation
of arm64, which requires a fallback to non-SIMD code when invoked in
certain contexts, expose the generic SM4 encrypt and decrypt routines
to other drivers.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel at linaro.org>
---
 crypto/sm4_generic.c | 10 ++++++----
 include/crypto/sm4.h |  3 +++
 2 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/crypto/sm4_generic.c b/crypto/sm4_generic.c
index f537a2766c55..c18eebfd5edd 100644
--- a/crypto/sm4_generic.c
+++ b/crypto/sm4_generic.c
@@ -190,21 +190,23 @@ static void sm4_do_crypt(const u32 *rk, u32 *out, const u32 *in)
 
 /* encrypt a block of text */
 
-static void sm4_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
+void crypto_sm4_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
 {
 	const struct crypto_sm4_ctx *ctx = crypto_tfm_ctx(tfm);
 
 	sm4_do_crypt(ctx->rkey_enc, (u32 *)out, (u32 *)in);
 }
+EXPORT_SYMBOL_GPL(crypto_sm4_encrypt);
 
 /* decrypt a block of text */
 
-static void sm4_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
+void crypto_sm4_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
 {
 	const struct crypto_sm4_ctx *ctx = crypto_tfm_ctx(tfm);
 
 	sm4_do_crypt(ctx->rkey_dec, (u32 *)out, (u32 *)in);
 }
+EXPORT_SYMBOL_GPL(crypto_sm4_decrypt);
 
 static struct crypto_alg sm4_alg = {
 	.cra_name		=	"sm4",
@@ -219,8 +221,8 @@ static struct crypto_alg sm4_alg = {
 			.cia_min_keysize	=	SM4_KEY_SIZE,
 			.cia_max_keysize	=	SM4_KEY_SIZE,
 			.cia_setkey		=	crypto_sm4_set_key,
-			.cia_encrypt		=	sm4_encrypt,
-			.cia_decrypt		=	sm4_decrypt
+			.cia_encrypt		=	crypto_sm4_encrypt,
+			.cia_decrypt		=	crypto_sm4_decrypt
 		}
 	}
 };
diff --git a/include/crypto/sm4.h b/include/crypto/sm4.h
index b64e64d20b28..7afd730d16ff 100644
--- a/include/crypto/sm4.h
+++ b/include/crypto/sm4.h
@@ -25,4 +25,7 @@ int crypto_sm4_set_key(struct crypto_tfm *tfm, const u8 *in_key,
 int crypto_sm4_expand_key(struct crypto_sm4_ctx *ctx, const u8 *in_key,
 			  unsigned int key_len);
 
+void crypto_sm4_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in);
+void crypto_sm4_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in);
+
 #endif
-- 
2.17.0