target/arm: Use aesdec_ISB_ISR_AK

This implements the AESD instruction.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

target/arm/tcg/crypto_helper.c

@@ -48,26 +48,6 @@ static void clear_tail_16(void *vd, uint32_t desc)
 
 static const AESState aes_zero = { };
 
-static void do_crypto_aese(uint64_t *rd, uint64_t *rn, uint64_t *rm,
-                           const uint8_t *sbox, const uint8_t *shift)
-{
-    union CRYPTO_STATE rk = { .l = { rm[0], rm[1] } };
-    union CRYPTO_STATE st = { .l = { rn[0], rn[1] } };
-    int i;
-
-    /* xor state vector with round key */
-    rk.l[0] ^= st.l[0];
-    rk.l[1] ^= st.l[1];
-
-    /* combine ShiftRows operation and sbox substitution */
-    for (i = 0; i < 16; i++) {
-        CR_ST_BYTE(st, i) = sbox[CR_ST_BYTE(rk, shift[i])];
-    }
-
-    rd[0] = st.l[0];
-    rd[1] = st.l[1];
-}
-
 void HELPER(crypto_aese)(void *vd, void *vn, void *vm, uint32_t desc)
 {
     intptr_t i, opr_sz = simd_oprsz(desc);
@@ -102,7 +82,22 @@ void HELPER(crypto_aesd)(void *vd, void *vn, void *vm, uint32_t desc)
     intptr_t i, opr_sz = simd_oprsz(desc);
 
     for (i = 0; i < opr_sz; i += 16) {
-        do_crypto_aese(vd + i, vn + i, vm + i, AES_isbox, AES_ishifts);
+        AESState *ad = (AESState *)(vd + i);
+        AESState *st = (AESState *)(vn + i);
+        AESState *rk = (AESState *)(vm + i);
+        AESState t;
+
+        /* Our uint64_t are in the wrong order for big-endian. */
+        if (HOST_BIG_ENDIAN) {
+            t.d[0] = st->d[1] ^ rk->d[1];
+            t.d[1] = st->d[0] ^ rk->d[0];
+            aesdec_ISB_ISR_AK(&t, &t, &aes_zero, false);
+            ad->d[0] = t.d[1];
+            ad->d[1] = t.d[0];
+        } else {
+            t.v = st->v ^ rk->v;
+            aesdec_ISB_ISR_AK(ad, &t, &aes_zero, false);
+        }
     }
     clear_tail(vd, opr_sz, simd_maxsz(desc));
 }