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mariadb/extra/yassl/taocrypt/src/rabbit.cpp
Anirudh Mangipudi 1747a45647 Bug#14211271 ISSUES WITH SSL ON DEBIAN WHEEZY I386 AND KFREEBSD-I386 
Problem:
It was reported that on Debian and KFreeBSD platforms, i386 architecture 
machines certain SSL tests are failing. main.ssl_connect  rpl.rpl_heartbeat_ssl
rpl.rpl_ssl1 rpl.rpl_ssl main.ssl_cipher, main.func_encrypt were the tests that
 were reportedly failing (crashing). The reason for the crashes are said to be
due to the assembly code of yaSSL.

Solution:
There was initially a workaround suggested i.e., to enable 
-DTAOCRYPT_DISABLE_X86ASM flag which would prevent the crash, but at an expense
 of 4X reduction of speed. Since this was unacceptable, the fix was the 
functions using assembly, now input variables from the function call using 
extended inline assembly on GCC instead of relying on direct assembly code.
2014-02-06 11:16:55 +05:30

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/*
Copyright (c) 2005, 2012, Oracle and/or its affiliates. All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
MA 02110-1301 USA.
*/
#include "runtime.hpp"
#include "rabbit.hpp"
namespace TaoCrypt {
#define U32V(x) (word32)(x)
#ifdef BIG_ENDIAN_ORDER
#define LITTLE32(x) ByteReverse((word32)x)
#else
#define LITTLE32(x) (x)
#endif
// local
namespace {
/* Square a 32-bit unsigned integer to obtain the 64-bit result and return */
/* the upper 32 bits XOR the lower 32 bits */
word32 RABBIT_g_func(word32 x)
{
/* Temporary variables */
word32 a, b, h, l;
/* Construct high and low argument for squaring */
a = x&0xFFFF;
b = x>>16;
/* Calculate high and low result of squaring */
h = (((U32V(a*a)>>17) + U32V(a*b))>>15) + b*b;
l = x*x;
/* Return high XOR low */
return U32V(h^l);
}
} // namespace local
/* Calculate the next internal state */
void Rabbit::NextState(RabbitCtx which)
{
/* Temporary variables */
word32 g[8], c_old[8], i;
Ctx* ctx;
if (which == Master)
ctx = &masterCtx_;
else
ctx = &workCtx_;
/* Save old counter values */
for (i=0; i<8; i++)
c_old[i] = ctx->c[i];
/* Calculate new counter values */
ctx->c[0] = U32V(ctx->c[0] + 0x4D34D34D + ctx->carry);
ctx->c[1] = U32V(ctx->c[1] + 0xD34D34D3 + (ctx->c[0] < c_old[0]));
ctx->c[2] = U32V(ctx->c[2] + 0x34D34D34 + (ctx->c[1] < c_old[1]));
ctx->c[3] = U32V(ctx->c[3] + 0x4D34D34D + (ctx->c[2] < c_old[2]));
ctx->c[4] = U32V(ctx->c[4] + 0xD34D34D3 + (ctx->c[3] < c_old[3]));
ctx->c[5] = U32V(ctx->c[5] + 0x34D34D34 + (ctx->c[4] < c_old[4]));
ctx->c[6] = U32V(ctx->c[6] + 0x4D34D34D + (ctx->c[5] < c_old[5]));
ctx->c[7] = U32V(ctx->c[7] + 0xD34D34D3 + (ctx->c[6] < c_old[6]));
ctx->carry = (ctx->c[7] < c_old[7]);
/* Calculate the g-values */
for (i=0;i<8;i++)
g[i] = RABBIT_g_func(U32V(ctx->x[i] + ctx->c[i]));
/* Calculate new state values */
ctx->x[0] = U32V(g[0] + rotlFixed(g[7],16) + rotlFixed(g[6], 16));
ctx->x[1] = U32V(g[1] + rotlFixed(g[0], 8) + g[7]);
ctx->x[2] = U32V(g[2] + rotlFixed(g[1],16) + rotlFixed(g[0], 16));
ctx->x[3] = U32V(g[3] + rotlFixed(g[2], 8) + g[1]);
ctx->x[4] = U32V(g[4] + rotlFixed(g[3],16) + rotlFixed(g[2], 16));
ctx->x[5] = U32V(g[5] + rotlFixed(g[4], 8) + g[3]);
ctx->x[6] = U32V(g[6] + rotlFixed(g[5],16) + rotlFixed(g[4], 16));
ctx->x[7] = U32V(g[7] + rotlFixed(g[6], 8) + g[5]);
}
/* IV setup */
void Rabbit::SetIV(const byte* iv)
{
/* Temporary variables */
word32 i0, i1, i2, i3, i;
/* Generate four subvectors */
i0 = LITTLE32(*(word32*)(iv+0));
i2 = LITTLE32(*(word32*)(iv+4));
i1 = (i0>>16) | (i2&0xFFFF0000);
i3 = (i2<<16) | (i0&0x0000FFFF);
/* Modify counter values */
workCtx_.c[0] = masterCtx_.c[0] ^ i0;
workCtx_.c[1] = masterCtx_.c[1] ^ i1;
workCtx_.c[2] = masterCtx_.c[2] ^ i2;
workCtx_.c[3] = masterCtx_.c[3] ^ i3;
workCtx_.c[4] = masterCtx_.c[4] ^ i0;
workCtx_.c[5] = masterCtx_.c[5] ^ i1;
workCtx_.c[6] = masterCtx_.c[6] ^ i2;
workCtx_.c[7] = masterCtx_.c[7] ^ i3;
/* Copy state variables */
for (i=0; i<8; i++)
workCtx_.x[i] = masterCtx_.x[i];
workCtx_.carry = masterCtx_.carry;
/* Iterate the system four times */
for (i=0; i<4; i++)
NextState(Work);
}
/* Key setup */
void Rabbit::SetKey(const byte* key, const byte* iv)
{
/* Temporary variables */
word32 k0, k1, k2, k3, i;
/* Generate four subkeys */
k0 = LITTLE32(*(word32*)(key+ 0));
k1 = LITTLE32(*(word32*)(key+ 4));
k2 = LITTLE32(*(word32*)(key+ 8));
k3 = LITTLE32(*(word32*)(key+12));
/* Generate initial state variables */
masterCtx_.x[0] = k0;
masterCtx_.x[2] = k1;
masterCtx_.x[4] = k2;
masterCtx_.x[6] = k3;
masterCtx_.x[1] = U32V(k3<<16) | (k2>>16);
masterCtx_.x[3] = U32V(k0<<16) | (k3>>16);
masterCtx_.x[5] = U32V(k1<<16) | (k0>>16);
masterCtx_.x[7] = U32V(k2<<16) | (k1>>16);
/* Generate initial counter values */
masterCtx_.c[0] = rotlFixed(k2, 16);
masterCtx_.c[2] = rotlFixed(k3, 16);
masterCtx_.c[4] = rotlFixed(k0, 16);
masterCtx_.c[6] = rotlFixed(k1, 16);
masterCtx_.c[1] = (k0&0xFFFF0000) | (k1&0xFFFF);
masterCtx_.c[3] = (k1&0xFFFF0000) | (k2&0xFFFF);
masterCtx_.c[5] = (k2&0xFFFF0000) | (k3&0xFFFF);
masterCtx_.c[7] = (k3&0xFFFF0000) | (k0&0xFFFF);
/* Clear carry bit */
masterCtx_.carry = 0;
/* Iterate the system four times */
for (i=0; i<4; i++)
NextState(Master);
/* Modify the counters */
for (i=0; i<8; i++)
masterCtx_.c[i] ^= masterCtx_.x[(i+4)&0x7];
/* Copy master instance to work instance */
for (i=0; i<8; i++) {
workCtx_.x[i] = masterCtx_.x[i];
workCtx_.c[i] = masterCtx_.c[i];
}
workCtx_.carry = masterCtx_.carry;
if (iv) SetIV(iv);
}
/* Encrypt/decrypt a message of any size */
void Rabbit::Process(byte* output, const byte* input, word32 msglen)
{
/* Temporary variables */
word32 i;
/* Encrypt/decrypt all full blocks */
while (msglen >= 16) {
/* Iterate the system */
NextState(Work);
/* Encrypt/decrypt 16 bytes of data */
*(word32*)(output+ 0) = *(word32*)(input+ 0) ^
LITTLE32(workCtx_.x[0] ^ (workCtx_.x[5]>>16) ^
U32V(workCtx_.x[3]<<16));
*(word32*)(output+ 4) = *(word32*)(input+ 4) ^
LITTLE32(workCtx_.x[2] ^ (workCtx_.x[7]>>16) ^
U32V(workCtx_.x[5]<<16));
*(word32*)(output+ 8) = *(word32*)(input+ 8) ^
LITTLE32(workCtx_.x[4] ^ (workCtx_.x[1]>>16) ^
U32V(workCtx_.x[7]<<16));
*(word32*)(output+12) = *(word32*)(input+12) ^
LITTLE32(workCtx_.x[6] ^ (workCtx_.x[3]>>16) ^
U32V(workCtx_.x[1]<<16));
/* Increment pointers and decrement length */
input += 16;
output += 16;
msglen -= 16;
}
/* Encrypt/decrypt remaining data */
if (msglen) {
word32 tmp[4];
byte* buffer = (byte*)tmp;
memset(tmp, 0, sizeof(tmp)); /* help static analysis */
/* Iterate the system */
NextState(Work);
/* Generate 16 bytes of pseudo-random data */
tmp[0] = LITTLE32(workCtx_.x[0] ^
(workCtx_.x[5]>>16) ^ U32V(workCtx_.x[3]<<16));
tmp[1] = LITTLE32(workCtx_.x[2] ^
(workCtx_.x[7]>>16) ^ U32V(workCtx_.x[5]<<16));
tmp[2] = LITTLE32(workCtx_.x[4] ^
(workCtx_.x[1]>>16) ^ U32V(workCtx_.x[7]<<16));
tmp[3] = LITTLE32(workCtx_.x[6] ^
(workCtx_.x[3]>>16) ^ U32V(workCtx_.x[1]<<16));
/* Encrypt/decrypt the data */
for (i=0; i<msglen; i++)
output[i] = input[i] ^ buffer[i];
}
}
} // namespace
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