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>

1 files changed, 58 insertions, 0 deletions

diff --git a/crypto/aes.c b/crypto/aes.c
index 6c05d73..a193d98 100644
--- a/crypto/aes.c
+++ b/crypto/aes.c
@@ -1323,6 +1323,64 @@ void aesenc_SB_SR_AK_genrev(AESState *r, const AESState *s, const AESState *k)
 }
 
 /*
+ * 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.
  */
 static inline void