* aes-internal.h (struct aes_table): sparc_idx[0] should now

contain index values shifted by the size of a word, and with 2
added. This saves some additions in the sparc assembler code.
Updates aes-encrypt-table.c and aes-decrypt-table.c.

* aes-internal.h (struct aes_table): Renamed the shift_idx field
to sparc_idx, as it will be tweaked to improve the sparc code.
Also reduced its size to [2][4].
(IDX_FACTOR): Deleted constant.
* aes-encrypt-table.c (_aes_encrypt_table): Adapted initializer of
sparc_idx.
* aes-decrypt-table.c (_aes_decrypt_table): Likewise.
* asm.m4: Deleted AES_SIDX2, to match struct aes_table.

Rev: src/nettle/aes-decrypt-table.c:1.3
Rev: src/nettle/aes-encrypt-table.c:1.3
Rev: src/nettle/aes-internal.h:1.8

aes-decrypt-table.c

@@ -66,9 +66,9 @@ _aes_decrypt_table =
       { 3, 0, 1, 2 },
       { 2, 3, 0, 1 },
       { 1, 2, 3, 0 } },
-    { /* sparc_idx, IDX1 and IDX3 shifted by the size of a word */
-      { 12, 0, 4,  8 },
-      {  4, 8, 12, 0 } },
+    { /* sparc_idx, explained in aes-internal.h */
+      { 14, 2, 6,  10 },
+      {  4, 8, 12,  0 } },
     { /* itable */
       { 
 	0x50a7f451,0x5365417e,0xc3a4171a,0x965e273a,

aes-encrypt-table.c

@@ -77,9 +77,9 @@ _aes_encrypt_table =
       { 1, 2, 3, 0 },
       { 2, 3, 0, 1 },
       { 3, 0, 1, 2 } },
-    { /* sparc_idx, IDX1 and IDX3 shifted by the size of a word */
-      {  4, 8, 12, 0 },
-      { 12, 0,  4, 8 } },
+    { /* sparc_idx, explained in aes-internal.h */
+      {  6, 10, 14, 2 },
+      { 12,  0,  4, 8 } },
     { /* dtable */
       { 
 	0xa56363c6,0x847c7cf8,0x997777ee,0x8d7b7bf6,

aes-internal.h

@@ -45,7 +45,12 @@ struct aes_table
   unsigned idx[3][4];
 
   /* Variant of the idx array suitable for the sparc
-   * assembler code. */
+   * assembler code.
+   *
+   * sparc_idx[0][i] = idx[0][i] * 4 + 2
+   * sparc_idx[1][i] = idx[2][i] * 4
+   */
+  
   unsigned sparc_idx [2][4]; 
 
   uint32_t table[AES_TABLE_SIZE][0x100];