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[v2,27/38] crypto: Add aesdec_ISB_ISR_IMC_AK

Message ID 20230609022401.684157-28-richard.henderson@linaro.org
State Superseded
Headers show
Series crypto: Provide aes-round.h and host accel | expand

Commit Message

Richard Henderson June 9, 2023, 2:23 a.m. UTC 
Add a primitive for InvSubBytes + InvShiftRows +
InvMixColumns + AddRoundKey.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 host/include/generic/host/aes-round.h |  3 ++
 include/crypto/aes-round.h            | 21 ++++++++++
 crypto/aes.c                          | 56 +++++++++++++++++++++++++++
 3 files changed, 80 insertions(+)
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Patch

diff --git a/host/include/generic/host/aes-round.h b/host/include/generic/host/aes-round.h
index ee64db32fa..16b4447831 100644
--- a/host/include/generic/host/aes-round.h
+++ b/host/include/generic/host/aes-round.h
@@ -23,5 +23,8 @@  void aesdec_IMC_accel(AESState *, const AESState *, bool)
 void aesdec_ISB_ISR_AK_accel(AESState *, const AESState *,
                              const AESState *, bool)
     QEMU_ERROR("unsupported accel");
+void aesdec_ISB_ISR_IMC_AK_accel(AESState *, const AESState *,
+                                 const AESState *, bool)
+    QEMU_ERROR("unsupported accel");
 
 #endif
diff --git a/include/crypto/aes-round.h b/include/crypto/aes-round.h
index 9e10c3ee9e..31c5f10df6 100644
--- a/include/crypto/aes-round.h
+++ b/include/crypto/aes-round.h
@@ -119,4 +119,25 @@  static inline void aesdec_ISB_ISR_AK(AESState *r, const AESState *st,
     }
 }
 
+/*
+ * Perform InvSubBytes + InvShiftRows + InvMixColumns + AddRoundKey.
+ */
+
+void aesdec_ISB_ISR_IMC_AK_gen(AESState *ret, const AESState *st,
+                               const AESState *rk);
+void aesdec_ISB_ISR_IMC_AK_genrev(AESState *ret, const AESState *st,
+                                  const AESState *rk);
+
+static inline void aesdec_ISB_ISR_IMC_AK(AESState *r, const AESState *st,
+                                         const AESState *rk, bool be)
+{
+    if (HAVE_AES_ACCEL) {
+        aesdec_ISB_ISR_IMC_AK_accel(r, st, rk, be);
+    } else if (HOST_BIG_ENDIAN == be) {
+        aesdec_ISB_ISR_IMC_AK_gen(r, st, rk);
+    } else {
+        aesdec_ISB_ISR_IMC_AK_genrev(r, st, rk);
+    }
+}
+
 #endif /* CRYPTO_AES_ROUND_H */
diff --git a/crypto/aes.c b/crypto/aes.c
index 0c281472aa..b671a3a6fb 100644
--- a/crypto/aes.c
+++ b/crypto/aes.c
@@ -1508,6 +1508,62 @@  void aesdec_IMC_genrev(AESState *r, const AESState *st)
     aesdec_IMC_swap(r, st, true);
 }
 
+/* Perform InvSubBytes + InvShiftRows + InvMixColumns + AddRoundKey. */
+static inline void
+aesdec_ISB_ISR_IMC_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_Td0[st->b[swap_b ^ AES_ISH_0]] ^
+          AES_Td1[st->b[swap_b ^ AES_ISH_1]] ^
+          AES_Td2[st->b[swap_b ^ AES_ISH_2]] ^
+          AES_Td3[st->b[swap_b ^ AES_ISH_3]]);
+
+    w1 = (AES_Td0[st->b[swap_b ^ AES_ISH_4]] ^
+          AES_Td1[st->b[swap_b ^ AES_ISH_5]] ^
+          AES_Td2[st->b[swap_b ^ AES_ISH_6]] ^
+          AES_Td3[st->b[swap_b ^ AES_ISH_7]]);
+
+    w2 = (AES_Td0[st->b[swap_b ^ AES_ISH_8]] ^
+          AES_Td1[st->b[swap_b ^ AES_ISH_9]] ^
+          AES_Td2[st->b[swap_b ^ AES_ISH_A]] ^
+          AES_Td3[st->b[swap_b ^ AES_ISH_B]]);
+
+    w3 = (AES_Td0[st->b[swap_b ^ AES_ISH_C]] ^
+          AES_Td1[st->b[swap_b ^ AES_ISH_D]] ^
+          AES_Td2[st->b[swap_b ^ AES_ISH_E]] ^
+          AES_Td3[st->b[swap_b ^ AES_ISH_F]]);
+
+    /* Note that AES_TdX 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 aesdec_ISB_ISR_IMC_AK_gen(AESState *r, const AESState *st,
+                               const AESState *rk)
+{
+    aesdec_ISB_ISR_IMC_AK_swap(r, st, rk, false);
+}
+
+void aesdec_ISB_ISR_IMC_AK_genrev(AESState *r, const AESState *st,
+                                  const AESState *rk)
+{
+    aesdec_ISB_ISR_IMC_AK_swap(r, st, rk, true);
+}
+
 /**
  * Expand the cipher key into the encryption key schedule.
  */