crypto: Add aesenc_SB_SR_MC_AK

Add a primitive for SubBytes + ShiftRows + MixColumns + AddRoundKey. Acked-by: Daniel P. Berrangé <berrange@redhat.com> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
qemu · Jul 8, 2023 · 7c58cb9 · 7c58cb9
1 parent 5b41deb
commit 7c58cb9
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diff --git a/crypto/aes.c b/crypto/aes.c
@@ -1322,6 +1322,64 @@ void aesenc_SB_SR_AK_genrev(AESState *r, const AESState *s, const AESState *k)
     aesenc_SB_SR_AK_swap(r, s, k, true);
 }
 
+/*
+ * Perform SubBytes + ShiftRows + MixColumns + AddRoundKey.
+ */
+static inline void
+aesenc_SB_SR_MC_AK_swap(AESState *r, const AESState *st,
+                        const AESState *rk, bool swap)
+{
+    int swap_b = swap * 0xf;
+    int swap_w = swap * 0x3;
+    bool be = HOST_BIG_ENDIAN ^ swap;
+    uint32_t w0, w1, w2, w3;
+
+    w0 = (AES_Te0[st->b[swap_b ^ AES_SH(0x0)]] ^
+          AES_Te1[st->b[swap_b ^ AES_SH(0x1)]] ^
+          AES_Te2[st->b[swap_b ^ AES_SH(0x2)]] ^
+          AES_Te3[st->b[swap_b ^ AES_SH(0x3)]]);
+
+    w1 = (AES_Te0[st->b[swap_b ^ AES_SH(0x4)]] ^
+          AES_Te1[st->b[swap_b ^ AES_SH(0x5)]] ^
+          AES_Te2[st->b[swap_b ^ AES_SH(0x6)]] ^
+          AES_Te3[st->b[swap_b ^ AES_SH(0x7)]]);
+
+    w2 = (AES_Te0[st->b[swap_b ^ AES_SH(0x8)]] ^
+          AES_Te1[st->b[swap_b ^ AES_SH(0x9)]] ^
+          AES_Te2[st->b[swap_b ^ AES_SH(0xA)]] ^
+          AES_Te3[st->b[swap_b ^ AES_SH(0xB)]]);
+
+    w3 = (AES_Te0[st->b[swap_b ^ AES_SH(0xC)]] ^
+          AES_Te1[st->b[swap_b ^ AES_SH(0xD)]] ^
+          AES_Te2[st->b[swap_b ^ AES_SH(0xE)]] ^
+          AES_Te3[st->b[swap_b ^ AES_SH(0xF)]]);
+
+    /* Note that AES_TeX is encoded for big-endian. */
+    if (!be) {
+        w0 = bswap32(w0);
+        w1 = bswap32(w1);
+        w2 = bswap32(w2);
+        w3 = bswap32(w3);
+    }
+
+    r->w[swap_w ^ 0] = rk->w[swap_w ^ 0] ^ w0;
+    r->w[swap_w ^ 1] = rk->w[swap_w ^ 1] ^ w1;
+    r->w[swap_w ^ 2] = rk->w[swap_w ^ 2] ^ w2;
+    r->w[swap_w ^ 3] = rk->w[swap_w ^ 3] ^ w3;
+}
+
+void aesenc_SB_SR_MC_AK_gen(AESState *r, const AESState *st,
+                            const AESState *rk)
+{
+    aesenc_SB_SR_MC_AK_swap(r, st, rk, false);
+}
+
+void aesenc_SB_SR_MC_AK_genrev(AESState *r, const AESState *st,
+                               const AESState *rk)
+{
+    aesenc_SB_SR_MC_AK_swap(r, st, rk, true);
+}
+
 /*
  * Perform InvMixColumns.
  */

diff --git a/host/include/generic/host/crypto/aes-round.h b/host/include/generic/host/crypto/aes-round.h
@@ -14,6 +14,9 @@ void aesenc_MC_accel(AESState *, const AESState *, bool)
 void aesenc_SB_SR_AK_accel(AESState *, const AESState *,
                            const AESState *, bool)
     QEMU_ERROR("unsupported accel");
+void aesenc_SB_SR_MC_AK_accel(AESState *, const AESState *,
+                              const AESState *, bool)
+    QEMU_ERROR("unsupported accel");
 
 void aesdec_IMC_accel(AESState *, const AESState *, bool)
     QEMU_ERROR("unsupported accel");

diff --git a/include/crypto/aes-round.h b/include/crypto/aes-round.h
@@ -59,6 +59,27 @@ static inline void aesenc_SB_SR_AK(AESState *r, const AESState *st,
     }
 }
 
+/*
+ * Perform SubBytes + ShiftRows + MixColumns + AddRoundKey.
+ */
+
+void aesenc_SB_SR_MC_AK_gen(AESState *ret, const AESState *st,
+                            const AESState *rk);
+void aesenc_SB_SR_MC_AK_genrev(AESState *ret, const AESState *st,
+                               const AESState *rk);
+
+static inline void aesenc_SB_SR_MC_AK(AESState *r, const AESState *st,
+                                      const AESState *rk, bool be)
+{
+    if (HAVE_AES_ACCEL) {
+        aesenc_SB_SR_MC_AK_accel(r, st, rk, be);
+    } else if (HOST_BIG_ENDIAN == be) {
+        aesenc_SB_SR_MC_AK_gen(r, st, rk);
+    } else {
+        aesenc_SB_SR_MC_AK_genrev(r, st, rk);
+    }
+}
+
 /*
  * Perform InvMixColumns.
  */