crypto: aegis/generic - fix for big endian systems

Use the correct __le32 annotation and accessors to perform the
single round of AES encryption performed inside the AEGIS transform.
Otherwise, tcrypt reports:

  alg: aead: Test 1 failed on encryption for aegis128-generic
  00000000: 6c 25 25 4a 3c 10 1d 27 2b c1 d4 84 9a ef 7f 6e
  alg: aead: Test 1 failed on encryption for aegis128l-generic
  00000000: cd c6 e3 b8 a0 70 9d 8e c2 4f 6f fe 71 42 df 28
  alg: aead: Test 1 failed on encryption for aegis256-generic
  00000000: aa ed 07 b1 96 1d e9 e6 f2 ed b5 8e 1c 5f dc 1c

Fixes: f606a88e5823 ("crypto: aegis - Add generic AEGIS AEAD implementations")
Cc: <stable@vger.kernel.org> # v4.18+
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Ondrej Mosnacek <omosnace@redhat.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 9 insertions, 11 deletions

diff --git a/crypto/aegis.h b/crypto/aegis.h
index f1c6900ddb80..405e025fc906 100644
--- a/crypto/aegis.h
+++ b/crypto/aegis.h
@@ -21,7 +21,7 @@
 
 union aegis_block {
         __le64 words64[AEGIS_BLOCK_SIZE / sizeof(__le64)];
-        u32 words32[AEGIS_BLOCK_SIZE / sizeof(u32)];
+        __le32 words32[AEGIS_BLOCK_SIZE / sizeof(__le32)];
         u8 bytes[AEGIS_BLOCK_SIZE];
 };
 
@@ -57,24 +57,22 @@ static void crypto_aegis_aesenc(union aegis_block *dst,
                                 const union aegis_block *src,
                                 const union aegis_block *key)
 {
-        u32 *d = dst->words32;
         const u8  *s  = src->bytes;
-        const u32 *k  = key->words32;
         const u32 *t0 = crypto_ft_tab[0];
         const u32 *t1 = crypto_ft_tab[1];
         const u32 *t2 = crypto_ft_tab[2];
         const u32 *t3 = crypto_ft_tab[3];
         u32 d0, d1, d2, d3;
 
-        d0 = t0[s[ 0]] ^ t1[s[ 5]] ^ t2[s[10]] ^ t3[s[15]] ^ k[0];
-        d1 = t0[s[ 4]] ^ t1[s[ 9]] ^ t2[s[14]] ^ t3[s[ 3]] ^ k[1];
-        d2 = t0[s[ 8]] ^ t1[s[13]] ^ t2[s[ 2]] ^ t3[s[ 7]] ^ k[2];
-        d3 = t0[s[12]] ^ t1[s[ 1]] ^ t2[s[ 6]] ^ t3[s[11]] ^ k[3];
+        d0 = t0[s[ 0]] ^ t1[s[ 5]] ^ t2[s[10]] ^ t3[s[15]];
+        d1 = t0[s[ 4]] ^ t1[s[ 9]] ^ t2[s[14]] ^ t3[s[ 3]];
+        d2 = t0[s[ 8]] ^ t1[s[13]] ^ t2[s[ 2]] ^ t3[s[ 7]];
+        d3 = t0[s[12]] ^ t1[s[ 1]] ^ t2[s[ 6]] ^ t3[s[11]];
 
-        d[0] = d0;
-        d[1] = d1;
-        d[2] = d2;
-        d[3] = d3;
+        dst->words32[0] = cpu_to_le32(d0) ^ key->words32[0];
+        dst->words32[1] = cpu_to_le32(d1) ^ key->words32[1];
+        dst->words32[2] = cpu_to_le32(d2) ^ key->words32[2];
+        dst->words32[3] = cpu_to_le32(d3) ^ key->words32[3];
 }
 
 #endif /* _CRYPTO_AEGIS_H */