[RFC PATCH 35/39] crypto: Move SM4_SBOXWORD from target/riscv

[Lawrence Hunter]

From: Max Chou <max.chou@sifive.com>

    - Share SM4_SBOXWORD between target/riscv and target/arm.

Signed-off-by: Max Chou <max.chou@sifive.com>
Reviewed-by: Frank Chang <frank.chang@sifive.com>
---
 include/crypto/sm4.h       |  7 +++++++
 target/arm/crypto_helper.c | 10 ++--------
 2 files changed, 9 insertions(+), 8 deletions(-)

diff --git a/include/crypto/sm4.h b/include/crypto/sm4.h
index 9bd3ebc62e..33478562a4 100644
--- a/include/crypto/sm4.h
+++ b/include/crypto/sm4.h
@@ -1,6 +1,13 @@
 #ifndef QEMU_SM4_H
 #define QEMU_SM4_H
 
+#define SM4_SBOXWORD(WORD) ( \
+    sm4_sbox[((WORD) >> 24) & 0xff] << 24 | \
+    sm4_sbox[((WORD) >> 16) & 0xff] << 16 | \
+    sm4_sbox[((WORD) >>  8) & 0xff] <<  8 | \
+    sm4_sbox[((WORD) >>  0) & 0xff] <<  0   \
+)
+
 extern const uint8_t sm4_sbox[256];
 
 #endif
diff --git a/target/arm/crypto_helper.c b/target/arm/crypto_helper.c
index d28690321f..4e97af9879 100644
--- a/target/arm/crypto_helper.c
+++ b/target/arm/crypto_helper.c
@@ -707,10 +707,7 @@ static void do_crypto_sm4e(uint64_t *rd, uint64_t *rn, 
uint64_t *rm)
             CR_ST_WORD(d, (i + 3) % 4) ^
             CR_ST_WORD(n, i);
 
-        t = sm4_sbox[t & 0xff] |
-            sm4_sbox[(t >> 8) & 0xff] << 8 |
-            sm4_sbox[(t >> 16) & 0xff] << 16 |
-            sm4_sbox[(t >> 24) & 0xff] << 24;
+        t = SM4_SBOXWORD(t);
 
         CR_ST_WORD(d, i) ^= t ^ rol32(t, 2) ^ rol32(t, 10) ^ rol32(t, 18) ^
                             rol32(t, 24);
@@ -744,10 +741,7 @@ static void do_crypto_sm4ekey(uint64_t *rd, uint64_t *rn, 
uint64_t *rm)
             CR_ST_WORD(d, (i + 3) % 4) ^
             CR_ST_WORD(m, i);
 
-        t = sm4_sbox[t & 0xff] |
-            sm4_sbox[(t >> 8) & 0xff] << 8 |
-            sm4_sbox[(t >> 16) & 0xff] << 16 |
-            sm4_sbox[(t >> 24) & 0xff] << 24;
+        t = SM4_SBOXWORD(t);
 
         CR_ST_WORD(d, i) ^= t ^ rol32(t, 13) ^ rol32(t, 23);
     }
-- 
2.39.1