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openssl/crypto/bn/asm/x86_64-gcc.c
Andy Polyakov e078642dde Fix for CVE-2014-3570. 
Reviewed-by: Emilia Kasper <emilia@openssl.org>
(cherry picked from commit e793809ba50c1e90ab592fb640a856168e50f3de)
(with 1.0.1-specific addendum)
2015-01-08 13:43:20 +00:00

602 lines
13 KiB
C
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#include "../bn_lcl.h"
#if !(defined(__GNUC__) && __GNUC__>=2)
# include "../bn_asm.c" /* kind of dirty hack for Sun Studio */
#else
/*
* x86_64 BIGNUM accelerator version 0.1, December 2002.
*
* Implemented by Andy Polyakov <appro@fy.chalmers.se> for the OpenSSL
* project.
*
* Rights for redistribution and usage in source and binary forms are
* granted according to the OpenSSL license. Warranty of any kind is
* disclaimed.
*
* Q. Version 0.1? It doesn't sound like Andy, he used to assign real
* versions, like 1.0...
* A. Well, that's because this code is basically a quick-n-dirty
* proof-of-concept hack. As you can see it's implemented with
* inline assembler, which means that you're bound to GCC and that
* there might be enough room for further improvement.
*
* Q. Why inline assembler?
* A. x86_64 features own ABI which I'm not familiar with. This is
* why I decided to let the compiler take care of subroutine
* prologue/epilogue as well as register allocation. For reference.
* Win64 implements different ABI for AMD64, different from Linux.
*
* Q. How much faster does it get?
* A. 'apps/openssl speed rsa dsa' output with no-asm:
*
* sign verify sign/s verify/s
* rsa 512 bits 0.0006s 0.0001s 1683.8 18456.2
* rsa 1024 bits 0.0028s 0.0002s 356.0 6407.0
* rsa 2048 bits 0.0172s 0.0005s 58.0 1957.8
* rsa 4096 bits 0.1155s 0.0018s 8.7 555.6
* sign verify sign/s verify/s
* dsa 512 bits 0.0005s 0.0006s 2100.8 1768.3
* dsa 1024 bits 0.0014s 0.0018s 692.3 559.2
* dsa 2048 bits 0.0049s 0.0061s 204.7 165.0
*
* 'apps/openssl speed rsa dsa' output with this module:
*
* sign verify sign/s verify/s
* rsa 512 bits 0.0004s 0.0000s 2767.1 33297.9
* rsa 1024 bits 0.0012s 0.0001s 867.4 14674.7
* rsa 2048 bits 0.0061s 0.0002s 164.0 5270.0
* rsa 4096 bits 0.0384s 0.0006s 26.1 1650.8
* sign verify sign/s verify/s
* dsa 512 bits 0.0002s 0.0003s 4442.2 3786.3
* dsa 1024 bits 0.0005s 0.0007s 1835.1 1497.4
* dsa 2048 bits 0.0016s 0.0020s 620.4 504.6
*
* For the reference. IA-32 assembler implementation performs
* very much like 64-bit code compiled with no-asm on the same
* machine.
*/
#ifdef _WIN64
#define BN_ULONG unsigned long long
#else
#define BN_ULONG unsigned long
#endif
#undef mul
#undef mul_add
#undef sqr
/*
* "m"(a), "+m"(r) is the way to favor DirectPath <20>-code;
* "g"(0) let the compiler to decide where does it
* want to keep the value of zero;
*/
#define mul_add(r,a,word,carry) do { \
register BN_ULONG high,low; \
asm ("mulq %3" \
: "=a"(low),"=d"(high) \
: "a"(word),"m"(a) \
: "cc"); \
asm ("addq %2,%0; adcq %3,%1" \
: "+r"(carry),"+d"(high)\
: "a"(low),"g"(0) \
: "cc"); \
asm ("addq %2,%0; adcq %3,%1" \
: "+m"(r),"+d"(high) \
: "r"(carry),"g"(0) \
: "cc"); \
carry=high; \
} while (0)
#define mul(r,a,word,carry) do { \
register BN_ULONG high,low; \
asm ("mulq %3" \
: "=a"(low),"=d"(high) \
: "a"(word),"g"(a) \
: "cc"); \
asm ("addq %2,%0; adcq %3,%1" \
: "+r"(carry),"+d"(high)\
: "a"(low),"g"(0) \
: "cc"); \
(r)=carry, carry=high; \
} while (0)
#define sqr(r0,r1,a) \
asm ("mulq %2" \
: "=a"(r0),"=d"(r1) \
: "a"(a) \
: "cc");
BN_ULONG bn_mul_add_words(BN_ULONG *rp, const BN_ULONG *ap, int num, BN_ULONG w)
{
BN_ULONG c1=0;
if (num <= 0) return(c1);
while (num&~3)
{
mul_add(rp[0],ap[0],w,c1);
mul_add(rp[1],ap[1],w,c1);
mul_add(rp[2],ap[2],w,c1);
mul_add(rp[3],ap[3],w,c1);
ap+=4; rp+=4; num-=4;
}
if (num)
{
mul_add(rp[0],ap[0],w,c1); if (--num==0) return c1;
mul_add(rp[1],ap[1],w,c1); if (--num==0) return c1;
mul_add(rp[2],ap[2],w,c1); return c1;
}
return(c1);
}
BN_ULONG bn_mul_words(BN_ULONG *rp, const BN_ULONG *ap, int num, BN_ULONG w)
{
BN_ULONG c1=0;
if (num <= 0) return(c1);
while (num&~3)
{
mul(rp[0],ap[0],w,c1);
mul(rp[1],ap[1],w,c1);
mul(rp[2],ap[2],w,c1);
mul(rp[3],ap[3],w,c1);
ap+=4; rp+=4; num-=4;
}
if (num)
{
mul(rp[0],ap[0],w,c1); if (--num == 0) return c1;
mul(rp[1],ap[1],w,c1); if (--num == 0) return c1;
mul(rp[2],ap[2],w,c1);
}
return(c1);
}
void bn_sqr_words(BN_ULONG *r, const BN_ULONG *a, int n)
{
if (n <= 0) return;
while (n&~3)
{
sqr(r[0],r[1],a[0]);
sqr(r[2],r[3],a[1]);
sqr(r[4],r[5],a[2]);
sqr(r[6],r[7],a[3]);
a+=4; r+=8; n-=4;
}
if (n)
{
sqr(r[0],r[1],a[0]); if (--n == 0) return;
sqr(r[2],r[3],a[1]); if (--n == 0) return;
sqr(r[4],r[5],a[2]);
}
}
BN_ULONG bn_div_words(BN_ULONG h, BN_ULONG l, BN_ULONG d)
{ BN_ULONG ret,waste;
asm ("divq %4"
: "=a"(ret),"=d"(waste)
: "a"(l),"d"(h),"g"(d)
: "cc");
return ret;
}
BN_ULONG bn_add_words (BN_ULONG *rp, const BN_ULONG *ap, const BN_ULONG *bp,int n)
{ BN_ULONG ret=0,i=0;
if (n <= 0) return 0;
asm volatile (
" subq %2,%2 \n"
".p2align 4 \n"
"1: movq (%4,%2,8),%0 \n"
" adcq (%5,%2,8),%0 \n"
" movq %0,(%3,%2,8) \n"
" leaq 1(%2),%2 \n"
" loop 1b \n"
" sbbq %0,%0 \n"
: "=&a"(ret),"+c"(n),"=&r"(i)
: "r"(rp),"r"(ap),"r"(bp)
: "cc", "memory"
);
return ret&1;
}
#ifndef SIMICS
BN_ULONG bn_sub_words (BN_ULONG *rp, const BN_ULONG *ap, const BN_ULONG *bp,int n)
{ BN_ULONG ret=0,i=0;
if (n <= 0) return 0;
asm volatile (
" subq %2,%2 \n"
".p2align 4 \n"
"1: movq (%4,%2,8),%0 \n"
" sbbq (%5,%2,8),%0 \n"
" movq %0,(%3,%2,8) \n"
" leaq 1(%2),%2 \n"
" loop 1b \n"
" sbbq %0,%0 \n"
: "=&a"(ret),"+c"(n),"=&r"(i)
: "r"(rp),"r"(ap),"r"(bp)
: "cc", "memory"
);
return ret&1;
}
#else
/* Simics 1.4<7 has buggy sbbq:-( */
#define BN_MASK2 0xffffffffffffffffL
BN_ULONG bn_sub_words(BN_ULONG *r, BN_ULONG *a, BN_ULONG *b, int n)
{
BN_ULONG t1,t2;
int c=0;
if (n <= 0) return((BN_ULONG)0);
for (;;)
{
t1=a[0]; t2=b[0];
r[0]=(t1-t2-c)&BN_MASK2;
if (t1 != t2) c=(t1 < t2);
if (--n <= 0) break;
t1=a[1]; t2=b[1];
r[1]=(t1-t2-c)&BN_MASK2;
if (t1 != t2) c=(t1 < t2);
if (--n <= 0) break;
t1=a[2]; t2=b[2];
r[2]=(t1-t2-c)&BN_MASK2;
if (t1 != t2) c=(t1 < t2);
if (--n <= 0) break;
t1=a[3]; t2=b[3];
r[3]=(t1-t2-c)&BN_MASK2;
if (t1 != t2) c=(t1 < t2);
if (--n <= 0) break;
a+=4;
b+=4;
r+=4;
}
return(c);
}
#endif
/* mul_add_c(a,b,c0,c1,c2) -- c+=a*b for three word number c=(c2,c1,c0) */
/* mul_add_c2(a,b,c0,c1,c2) -- c+=2*a*b for three word number c=(c2,c1,c0) */
/* sqr_add_c(a,i,c0,c1,c2) -- c+=a[i]^2 for three word number c=(c2,c1,c0) */
/* sqr_add_c2(a,i,c0,c1,c2) -- c+=2*a[i]*a[j] for three word number c=(c2,c1,c0) */
/*
* Keep in mind that carrying into high part of multiplication result
* can not overflow, because it cannot be all-ones.
*/
#if 0
/* original macros are kept for reference purposes */
#define mul_add_c(a,b,c0,c1,c2) { \
BN_ULONG ta=(a),tb=(b); \
t1 = ta * tb; \
t2 = BN_UMULT_HIGH(ta,tb); \
c0 += t1; t2 += (c0<t1)?1:0; \
c1 += t2; c2 += (c1<t2)?1:0; \
}
#define mul_add_c2(a,b,c0,c1,c2) { \
BN_ULONG ta=(a),tb=(b),t0; \
t1 = BN_UMULT_HIGH(ta,tb); \
t0 = ta * tb; \
c0 += t0; t2 = t1+((c0<t0)?1:0);\
c1 += t2; c2 += (c1<t2)?1:0; \
c0 += t0; t1 += (c0<t0)?1:0; \
c1 += t1; c2 += (c1<t1)?1:0; \
}
#else
#define mul_add_c(a,b,c0,c1,c2) do { \
asm ("mulq %3" \
: "=a"(t1),"=d"(t2) \
: "a"(a),"m"(b) \
: "cc"); \
asm ("addq %2,%0; adcq %3,%1" \
: "+r"(c0),"+d"(t2) \
: "a"(t1),"g"(0) \
: "cc"); \
asm ("addq %2,%0; adcq %3,%1" \
: "+r"(c1),"+r"(c2) \
: "d"(t2),"g"(0) \
: "cc"); \
} while (0)
#define sqr_add_c(a,i,c0,c1,c2) do { \
asm ("mulq %2" \
: "=a"(t1),"=d"(t2) \
: "a"(a[i]) \
: "cc"); \
asm ("addq %2,%0; adcq %3,%1" \
: "+r"(c0),"+d"(t2) \
: "a"(t1),"g"(0) \
: "cc"); \
asm ("addq %2,%0; adcq %3,%1" \
: "+r"(c1),"+r"(c2) \
: "d"(t2),"g"(0) \
: "cc"); \
} while (0)
#define mul_add_c2(a,b,c0,c1,c2) do { \
asm ("mulq %3" \
: "=a"(t1),"=d"(t2) \
: "a"(a),"m"(b) \
: "cc"); \
asm ("addq %3,%0; adcq %4,%1; adcq %5,%2" \
: "+r"(c0),"+r"(c1),"+r"(c2) \
: "r"(t1),"r"(t2),"g"(0) \
: "cc"); \
asm ("addq %3,%0; adcq %4,%1; adcq %5,%2" \
: "+r"(c0),"+r"(c1),"+r"(c2) \
: "r"(t1),"r"(t2),"g"(0) \
: "cc"); \
} while (0)
#endif
#define sqr_add_c2(a,i,j,c0,c1,c2) \
mul_add_c2((a)[i],(a)[j],c0,c1,c2)
void bn_mul_comba8(BN_ULONG *r, BN_ULONG *a, BN_ULONG *b)
{
BN_ULONG t1,t2;
BN_ULONG c1,c2,c3;
c1=0;
c2=0;
c3=0;
mul_add_c(a[0],b[0],c1,c2,c3);
r[0]=c1;
c1=0;
mul_add_c(a[0],b[1],c2,c3,c1);
mul_add_c(a[1],b[0],c2,c3,c1);
r[1]=c2;
c2=0;
mul_add_c(a[2],b[0],c3,c1,c2);
mul_add_c(a[1],b[1],c3,c1,c2);
mul_add_c(a[0],b[2],c3,c1,c2);
r[2]=c3;
c3=0;
mul_add_c(a[0],b[3],c1,c2,c3);
mul_add_c(a[1],b[2],c1,c2,c3);
mul_add_c(a[2],b[1],c1,c2,c3);
mul_add_c(a[3],b[0],c1,c2,c3);
r[3]=c1;
c1=0;
mul_add_c(a[4],b[0],c2,c3,c1);
mul_add_c(a[3],b[1],c2,c3,c1);
mul_add_c(a[2],b[2],c2,c3,c1);
mul_add_c(a[1],b[3],c2,c3,c1);
mul_add_c(a[0],b[4],c2,c3,c1);
r[4]=c2;
c2=0;
mul_add_c(a[0],b[5],c3,c1,c2);
mul_add_c(a[1],b[4],c3,c1,c2);
mul_add_c(a[2],b[3],c3,c1,c2);
mul_add_c(a[3],b[2],c3,c1,c2);
mul_add_c(a[4],b[1],c3,c1,c2);
mul_add_c(a[5],b[0],c3,c1,c2);
r[5]=c3;
c3=0;
mul_add_c(a[6],b[0],c1,c2,c3);
mul_add_c(a[5],b[1],c1,c2,c3);
mul_add_c(a[4],b[2],c1,c2,c3);
mul_add_c(a[3],b[3],c1,c2,c3);
mul_add_c(a[2],b[4],c1,c2,c3);
mul_add_c(a[1],b[5],c1,c2,c3);
mul_add_c(a[0],b[6],c1,c2,c3);
r[6]=c1;
c1=0;
mul_add_c(a[0],b[7],c2,c3,c1);
mul_add_c(a[1],b[6],c2,c3,c1);
mul_add_c(a[2],b[5],c2,c3,c1);
mul_add_c(a[3],b[4],c2,c3,c1);
mul_add_c(a[4],b[3],c2,c3,c1);
mul_add_c(a[5],b[2],c2,c3,c1);
mul_add_c(a[6],b[1],c2,c3,c1);
mul_add_c(a[7],b[0],c2,c3,c1);
r[7]=c2;
c2=0;
mul_add_c(a[7],b[1],c3,c1,c2);
mul_add_c(a[6],b[2],c3,c1,c2);
mul_add_c(a[5],b[3],c3,c1,c2);
mul_add_c(a[4],b[4],c3,c1,c2);
mul_add_c(a[3],b[5],c3,c1,c2);
mul_add_c(a[2],b[6],c3,c1,c2);
mul_add_c(a[1],b[7],c3,c1,c2);
r[8]=c3;
c3=0;
mul_add_c(a[2],b[7],c1,c2,c3);
mul_add_c(a[3],b[6],c1,c2,c3);
mul_add_c(a[4],b[5],c1,c2,c3);
mul_add_c(a[5],b[4],c1,c2,c3);
mul_add_c(a[6],b[3],c1,c2,c3);
mul_add_c(a[7],b[2],c1,c2,c3);
r[9]=c1;
c1=0;
mul_add_c(a[7],b[3],c2,c3,c1);
mul_add_c(a[6],b[4],c2,c3,c1);
mul_add_c(a[5],b[5],c2,c3,c1);
mul_add_c(a[4],b[6],c2,c3,c1);
mul_add_c(a[3],b[7],c2,c3,c1);
r[10]=c2;
c2=0;
mul_add_c(a[4],b[7],c3,c1,c2);
mul_add_c(a[5],b[6],c3,c1,c2);
mul_add_c(a[6],b[5],c3,c1,c2);
mul_add_c(a[7],b[4],c3,c1,c2);
r[11]=c3;
c3=0;
mul_add_c(a[7],b[5],c1,c2,c3);
mul_add_c(a[6],b[6],c1,c2,c3);
mul_add_c(a[5],b[7],c1,c2,c3);
r[12]=c1;
c1=0;
mul_add_c(a[6],b[7],c2,c3,c1);
mul_add_c(a[7],b[6],c2,c3,c1);
r[13]=c2;
c2=0;
mul_add_c(a[7],b[7],c3,c1,c2);
r[14]=c3;
r[15]=c1;
}
void bn_mul_comba4(BN_ULONG *r, BN_ULONG *a, BN_ULONG *b)
{
BN_ULONG t1,t2;
BN_ULONG c1,c2,c3;
c1=0;
c2=0;
c3=0;
mul_add_c(a[0],b[0],c1,c2,c3);
r[0]=c1;
c1=0;
mul_add_c(a[0],b[1],c2,c3,c1);
mul_add_c(a[1],b[0],c2,c3,c1);
r[1]=c2;
c2=0;
mul_add_c(a[2],b[0],c3,c1,c2);
mul_add_c(a[1],b[1],c3,c1,c2);
mul_add_c(a[0],b[2],c3,c1,c2);
r[2]=c3;
c3=0;
mul_add_c(a[0],b[3],c1,c2,c3);
mul_add_c(a[1],b[2],c1,c2,c3);
mul_add_c(a[2],b[1],c1,c2,c3);
mul_add_c(a[3],b[0],c1,c2,c3);
r[3]=c1;
c1=0;
mul_add_c(a[3],b[1],c2,c3,c1);
mul_add_c(a[2],b[2],c2,c3,c1);
mul_add_c(a[1],b[3],c2,c3,c1);
r[4]=c2;
c2=0;
mul_add_c(a[2],b[3],c3,c1,c2);
mul_add_c(a[3],b[2],c3,c1,c2);
r[5]=c3;
c3=0;
mul_add_c(a[3],b[3],c1,c2,c3);
r[6]=c1;
r[7]=c2;
}
void bn_sqr_comba8(BN_ULONG *r, const BN_ULONG *a)
{
BN_ULONG t1,t2;
BN_ULONG c1,c2,c3;
c1=0;
c2=0;
c3=0;
sqr_add_c(a,0,c1,c2,c3);
r[0]=c1;
c1=0;
sqr_add_c2(a,1,0,c2,c3,c1);
r[1]=c2;
c2=0;
sqr_add_c(a,1,c3,c1,c2);
sqr_add_c2(a,2,0,c3,c1,c2);
r[2]=c3;
c3=0;
sqr_add_c2(a,3,0,c1,c2,c3);
sqr_add_c2(a,2,1,c1,c2,c3);
r[3]=c1;
c1=0;
sqr_add_c(a,2,c2,c3,c1);
sqr_add_c2(a,3,1,c2,c3,c1);
sqr_add_c2(a,4,0,c2,c3,c1);
r[4]=c2;
c2=0;
sqr_add_c2(a,5,0,c3,c1,c2);
sqr_add_c2(a,4,1,c3,c1,c2);
sqr_add_c2(a,3,2,c3,c1,c2);
r[5]=c3;
c3=0;
sqr_add_c(a,3,c1,c2,c3);
sqr_add_c2(a,4,2,c1,c2,c3);
sqr_add_c2(a,5,1,c1,c2,c3);
sqr_add_c2(a,6,0,c1,c2,c3);
r[6]=c1;
c1=0;
sqr_add_c2(a,7,0,c2,c3,c1);
sqr_add_c2(a,6,1,c2,c3,c1);
sqr_add_c2(a,5,2,c2,c3,c1);
sqr_add_c2(a,4,3,c2,c3,c1);
r[7]=c2;
c2=0;
sqr_add_c(a,4,c3,c1,c2);
sqr_add_c2(a,5,3,c3,c1,c2);
sqr_add_c2(a,6,2,c3,c1,c2);
sqr_add_c2(a,7,1,c3,c1,c2);
r[8]=c3;
c3=0;
sqr_add_c2(a,7,2,c1,c2,c3);
sqr_add_c2(a,6,3,c1,c2,c3);
sqr_add_c2(a,5,4,c1,c2,c3);
r[9]=c1;
c1=0;
sqr_add_c(a,5,c2,c3,c1);
sqr_add_c2(a,6,4,c2,c3,c1);
sqr_add_c2(a,7,3,c2,c3,c1);
r[10]=c2;
c2=0;
sqr_add_c2(a,7,4,c3,c1,c2);
sqr_add_c2(a,6,5,c3,c1,c2);
r[11]=c3;
c3=0;
sqr_add_c(a,6,c1,c2,c3);
sqr_add_c2(a,7,5,c1,c2,c3);
r[12]=c1;
c1=0;
sqr_add_c2(a,7,6,c2,c3,c1);
r[13]=c2;
c2=0;
sqr_add_c(a,7,c3,c1,c2);
r[14]=c3;
r[15]=c1;
}
void bn_sqr_comba4(BN_ULONG *r, const BN_ULONG *a)
{
BN_ULONG t1,t2;
BN_ULONG c1,c2,c3;
c1=0;
c2=0;
c3=0;
sqr_add_c(a,0,c1,c2,c3);
r[0]=c1;
c1=0;
sqr_add_c2(a,1,0,c2,c3,c1);
r[1]=c2;
c2=0;
sqr_add_c(a,1,c3,c1,c2);
sqr_add_c2(a,2,0,c3,c1,c2);
r[2]=c3;
c3=0;
sqr_add_c2(a,3,0,c1,c2,c3);
sqr_add_c2(a,2,1,c1,c2,c3);
r[3]=c1;
c1=0;
sqr_add_c(a,2,c2,c3,c1);
sqr_add_c2(a,3,1,c2,c3,c1);
r[4]=c2;
c2=0;
sqr_add_c2(a,3,2,c3,c1,c2);
r[5]=c3;
c3=0;
sqr_add_c(a,3,c1,c2,c3);
r[6]=c1;
r[7]=c2;
}
#endif
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