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Clean up ARMv8-a aes_expand_key()

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The inline asm was lying about its parameters
This commit is contained in:
hyc 2017-04-12 23:53:08 +01:00
parent a3d779013d
commit a467321800
1 changed files with 16 additions and 24 deletions
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40
src/crypto/slow-hash.c
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@ -722,32 +722,24 @@ union cn_slow_hash_state
* key schedule. Don't try to use this for vanilla AES.
*/
static void aes_expand_key(const uint8_t *key, uint8_t *expandedKey) {
__asm__("mov x2, %1\n\t" : : "r"(key), "r"(expandedKey));
static const int rcon[] = {
0x01,0x01,0x01,0x01,
0x0c0f0e0d,0x0c0f0e0d,0x0c0f0e0d,0x0c0f0e0d, // rotate-n-splat
0x1b,0x1b,0x1b,0x1b };
__asm__(
" adr x3,Lrcon\n"
"\n"
" eor v0.16b,v0.16b,v0.16b\n"
" ld1 {v3.16b},[x0],#16\n"
" ld1 {v1.4s,v2.4s},[x3],#32\n"
" b L256\n"
".align 5\n"
"Lrcon:\n"
".long 0x01,0x01,0x01,0x01\n"
".long 0x0c0f0e0d,0x0c0f0e0d,0x0c0f0e0d,0x0c0f0e0d // rotate-n-splat\n"
".long 0x1b,0x1b,0x1b,0x1b\n"
" ld1 {v3.16b},[%0],#16\n"
" ld1 {v1.4s,v2.4s},[%2],#32\n"
" ld1 {v4.16b},[%0]\n"
" mov w2,#5\n"
" st1 {v3.4s},[%1],#16\n"
"\n"
".align 4\n"
"L256:\n"
" ld1 {v4.16b},[x0]\n"
" mov w1,#5\n"
" st1 {v3.4s},[x2],#16\n"
"\n"
"Loop256:\n"
"1:\n"
" tbl v6.16b,{v4.16b},v2.16b\n"
" ext v5.16b,v0.16b,v3.16b,#12\n"
" st1 {v4.4s},[x2],#16\n"
" st1 {v4.4s},[%1],#16\n"
" aese v6.16b,v0.16b\n"
" subs w1,w1,#1\n"
" subs w2,w2,#1\n"
"\n"
" eor v3.16b,v3.16b,v5.16b\n"
" ext v5.16b,v0.16b,v5.16b,#12\n"
@ -757,8 +749,8 @@ __asm__(
" eor v3.16b,v3.16b,v5.16b\n"
" shl v1.16b,v1.16b,#1\n"
" eor v3.16b,v3.16b,v6.16b\n"
" st1 {v3.4s},[x2],#16\n"
" b.eq Ldone\n"
" st1 {v3.4s},[%1],#16\n"
" b.eq 2f\n"
"\n"
" dup v6.4s,v3.s[3] // just splat\n"
" ext v5.16b,v0.16b,v4.16b,#12\n"
@ -771,9 +763,9 @@ __asm__(
" eor v4.16b,v4.16b,v5.16b\n"
"\n"
" eor v4.16b,v4.16b,v6.16b\n"
" b Loop256\n"
" b 1b\n"
"\n"
"Ldone:\n");
"2:\n" : : "r"(key), "r"(expandedKey), "r"(rcon));
}
/* An ordinary AES round is a sequence of SubBytes, ShiftRows, MixColumns, AddRoundKey. There