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| author | David S. Miller <davem@davemloft.net> | 2012-09-02 08:05:43 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-09-02 08:05:43 +0200 |
| commit | 699871bc943be418be13208526bc613d68017fab (patch) | |
| tree | d65e584a1b7d71601a8acfae81262237c402b5e1 /arch/sparc/crypto | |
| parent | sparc64: Avoid code duplication in crypto assembler. (diff) | |
| download | linux-699871bc943be418be13208526bc613d68017fab.tar.xz linux-699871bc943be418be13208526bc613d68017fab.zip | |
sparc64: Fix bugs in unrolled 256-bit loops.
Some dm-crypt testing revealed several bugs in the 256-bit unrolled
loops.
The DECRYPT_256_2() macro had two errors:
1) Missing reload of KEY registers %f60 and %f62
2) Missing "\" in penultimate line of definition.
In aes_sparc64_ecb_decrypt_256, we were storing the second half of the
encryption result from the wrong source registers.
In aes_sparc64_ctr_crypt_256 we have to be careful when we fall out of
the 32-byte-at-a-time loop and handle a trailing 16-byte chunk. In
that case we've clobbered the final key holding registers and have to
restore them before executing the ENCRYPT_256() macro. Inside of the
32-byte-at-a-time loop things are OK, because we do this key register
restoring during the first few rounds of the ENCRYPT_256_2() macro.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc/crypto')
| -rw-r--r-- | arch/sparc/crypto/aes_asm.S | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/arch/sparc/crypto/aes_asm.S b/arch/sparc/crypto/aes_asm.S index 20860885f068..23f6cbb910d3 100644 --- a/arch/sparc/crypto/aes_asm.S +++ b/arch/sparc/crypto/aes_asm.S @@ -188,6 +188,8 @@ ldd [%o0 + 0x18], %f56; \ ldd [%o0 + 0x10], %f58; \ DECRYPT_256_TWO_ROUNDS_2(KEY_BASE + 8, I0, I1, I2, I3, KEY_BASE + 0) \ + ldd [%o0 + 0x08], %f60; \ + ldd [%o0 + 0x00], %f62; \ DECRYPT_256_TWO_ROUNDS_2(KEY_BASE + 16, I0, I1, I2, I3, KEY_BASE + 0) \ DECRYPT_256_TWO_ROUNDS_2(KEY_BASE + 24, I0, I1, I2, I3, KEY_BASE + 0) \ DECRYPT_256_TWO_ROUNDS_2(KEY_BASE + 32, I0, I1, I2, I3, KEY_BASE + 0) \ @@ -201,7 +203,7 @@ ldd [%o0 + 0xd8], %f8; \ ldd [%o0 + 0xd0], %f10; \ AES_DROUND23_L(KEY_BASE + 52, KEY_BASE + 4, KEY_BASE + 6, I3) \ - AES_DROUND01_L(KEY_BASE + 54, KEY_BASE + 4, KEY_BASE + 6, I2) + AES_DROUND01_L(KEY_BASE + 54, KEY_BASE + 4, KEY_BASE + 6, I2) \ ldd [%o0 + 0xc8], %f12; \ ldd [%o0 + 0xc0], %f14; @@ -1144,8 +1146,8 @@ ENTRY(aes_sparc64_ecb_decrypt_256) DECRYPT_256_2(8, 4, 6, 0, 2) std %f4, [%o2 + 0x00] std %f6, [%o2 + 0x08] - std %f60, [%o2 + 0x10] - std %f62, [%o2 + 0x18] + std %f0, [%o2 + 0x10] + std %f2, [%o2 + 0x18] sub %o3, 0x20, %o3 add %o1, 0x20, %o1 brgz,pt %o3, 1b @@ -1509,6 +1511,10 @@ ENTRY(aes_sparc64_ctr_crypt_256) add %o2, 0x20, %o2 brlz,pt %o3, 11f nop + ldd [%o0 + 0xd0], %f56 + ldd [%o0 + 0xd8], %f58 + ldd [%o0 + 0xe0], %f60 + ldd [%o0 + 0xe8], %f62 10: xor %g1, %g3, %o5 MOVXTOD_O5_F0 xor %g2, %g7, %o5 |