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Reserve for SMALL_FOOTPRINT bn_asm.c. Currently OPENSSL_SMALL_FOOTPRINT

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is defined on Windows CE targets.
This commit is contained in:
Andy Polyakov 2005-10-04 06:22:11 +00:00
parent e738280547
commit 682b112abc
2 changed files with 84 additions and 75 deletions
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2
crypto/bn/bn.h
View file

@ -94,9 +94,11 @@ extern "C" {
/* #define BN_DEBUG */
/* #define BN_DEBUG_RAND */
#ifndef OPENSSL_SMALL_FOOTPRINT
#define BN_MUL_COMBA
#define BN_SQR_COMBA
#define BN_RECURSION
#endif
/* This next option uses the C libraries (2 word)/(1 word) function.
* If it is not defined, I use my C version (which is slower).

157
crypto/bn/bn_asm.c
View file

@ -75,6 +75,7 @@ BN_ULONG bn_mul_add_words(BN_ULONG *rp, const BN_ULONG *ap, int num, BN_ULONG w)
assert(num >= 0);
if (num <= 0) return(c1);
#ifndef OPENSSL_SMALL_FOOTPRINT
while (num&~3)
{
mul_add(rp[0],ap[0],w,c1);
@ -83,11 +84,11 @@ BN_ULONG bn_mul_add_words(BN_ULONG *rp, const BN_ULONG *ap, int num, BN_ULONG w)
mul_add(rp[3],ap[3],w,c1);
ap+=4; rp+=4; num-=4;
}
if (num)
#endif
while (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;
mul_add(rp[0],ap[0],w,c1);
ap++; rp++; num--;
}
return(c1);
@ -100,6 +101,7 @@ BN_ULONG bn_mul_words(BN_ULONG *rp, const BN_ULONG *ap, int num, BN_ULONG w)
assert(num >= 0);
if (num <= 0) return(c1);
#ifndef OPENSSL_SMALL_FOOTPRINT
while (num&~3)
{
mul(rp[0],ap[0],w,c1);
@ -108,11 +110,11 @@ BN_ULONG bn_mul_words(BN_ULONG *rp, const BN_ULONG *ap, int num, BN_ULONG w)
mul(rp[3],ap[3],w,c1);
ap+=4; rp+=4; num-=4;
}
if (num)
#endif
while (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);
mul(rp[0],ap[0],w,c1);
ap++; rp++; num--;
}
return(c1);
}
@ -121,6 +123,8 @@ void bn_sqr_words(BN_ULONG *r, const BN_ULONG *a, int n)
{
assert(n >= 0);
if (n <= 0) return;
#ifndef OPENSSL_SMALL_FOOTPRINT
while (n&~3)
{
sqr(r[0],r[1],a[0]);
@ -129,11 +133,11 @@ void bn_sqr_words(BN_ULONG *r, const BN_ULONG *a, int n)
sqr(r[6],r[7],a[3]);
a+=4; r+=8; n-=4;
}
if (n)
#endif
while (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]);
sqr(r[0],r[1],a[0]);
a++; r+=2; n--;
}
}
@ -150,18 +154,20 @@ BN_ULONG bn_mul_add_words(BN_ULONG *rp, const BN_ULONG *ap, int num, BN_ULONG w)
bl=LBITS(w);
bh=HBITS(w);
for (;;)
#ifndef OPENSSL_SMALL_FOOTPRINT
while (num&~3)
{
mul_add(rp[0],ap[0],bl,bh,c);
if (--num == 0) break;
mul_add(rp[1],ap[1],bl,bh,c);
if (--num == 0) break;
mul_add(rp[2],ap[2],bl,bh,c);
if (--num == 0) break;
mul_add(rp[3],ap[3],bl,bh,c);
if (--num == 0) break;
ap+=4;
rp+=4;
ap+=4; rp+=4; num-=4;
}
#endif
while (num)
{
mul_add(rp[0],ap[0],bl,bh,c);
ap++; rp++; num--;
}
return(c);
}
@ -177,18 +183,20 @@ BN_ULONG bn_mul_words(BN_ULONG *rp, const BN_ULONG *ap, int num, BN_ULONG w)
bl=LBITS(w);
bh=HBITS(w);
for (;;)
#ifndef OPENSSL_SMALL_FOOTPRINT
while (num&~3)
{
mul(rp[0],ap[0],bl,bh,carry);
if (--num == 0) break;
mul(rp[1],ap[1],bl,bh,carry);
if (--num == 0) break;
mul(rp[2],ap[2],bl,bh,carry);
if (--num == 0) break;
mul(rp[3],ap[3],bl,bh,carry);
if (--num == 0) break;
ap+=4;
rp+=4;
ap+=4; rp+=4; num-=4;
}
#endif
while (num)
{
mul(rp[0],ap[0],bl,bh,carry);
ap++; rp++; num--;
}
return(carry);
}
@ -197,22 +205,21 @@ void bn_sqr_words(BN_ULONG *r, const BN_ULONG *a, int n)
{
assert(n >= 0);
if (n <= 0) return;
for (;;)
#ifndef OPENSSL_SMALL_FOOTPRINT
while (n&~3)
{
sqr64(r[0],r[1],a[0]);
if (--n == 0) break;
sqr64(r[2],r[3],a[1]);
if (--n == 0) break;
sqr64(r[4],r[5],a[2]);
if (--n == 0) break;
sqr64(r[6],r[7],a[3]);
if (--n == 0) break;
a+=4;
r+=8;
a+=4; r+=8; n-=4;
}
#endif
while (n)
{
sqr64(r[0],r[1],a[0]);
a++; r+=2; n--;
}
}
@ -303,31 +310,30 @@ BN_ULONG bn_add_words(BN_ULONG *r, const BN_ULONG *a, const BN_ULONG *b, int n)
assert(n >= 0);
if (n <= 0) return((BN_ULONG)0);
for (;;)
#ifndef OPENSSL_SMALL_FOOTPRINT
while (n&~3)
{
ll+=(BN_ULLONG)a[0]+b[0];
r[0]=(BN_ULONG)ll&BN_MASK2;
ll>>=BN_BITS2;
if (--n <= 0) break;
ll+=(BN_ULLONG)a[1]+b[1];
r[1]=(BN_ULONG)ll&BN_MASK2;
ll>>=BN_BITS2;
if (--n <= 0) break;
ll+=(BN_ULLONG)a[2]+b[2];
r[2]=(BN_ULONG)ll&BN_MASK2;
ll>>=BN_BITS2;
if (--n <= 0) break;
ll+=(BN_ULLONG)a[3]+b[3];
r[3]=(BN_ULONG)ll&BN_MASK2;
ll>>=BN_BITS2;
if (--n <= 0) break;
a+=4;
b+=4;
r+=4;
a+=4; b+=4; r+=4; n-=4;
}
#endif
while (n)
{
ll+=(BN_ULLONG)a[0]+b[0];
r[0]=(BN_ULONG)ll&BN_MASK2;
ll>>=BN_BITS2;
a++; b++; r++; n--;
}
return((BN_ULONG)ll);
}
@ -340,7 +346,8 @@ BN_ULONG bn_add_words(BN_ULONG *r, const BN_ULONG *a, const BN_ULONG *b, int n)
if (n <= 0) return((BN_ULONG)0);
c=0;
for (;;)
#ifndef OPENSSL_SMALL_FOOTPRINT
while (n&~3)
{
t=a[0];
t=(t+c)&BN_MASK2;
@ -348,35 +355,36 @@ BN_ULONG bn_add_words(BN_ULONG *r, const BN_ULONG *a, const BN_ULONG *b, int n)
l=(t+b[0])&BN_MASK2;
c+=(l < t);
r[0]=l;
if (--n <= 0) break;
t=a[1];
t=(t+c)&BN_MASK2;
c=(t < c);
l=(t+b[1])&BN_MASK2;
c+=(l < t);
r[1]=l;
if (--n <= 0) break;
t=a[2];
t=(t+c)&BN_MASK2;
c=(t < c);
l=(t+b[2])&BN_MASK2;
c+=(l < t);
r[2]=l;
if (--n <= 0) break;
t=a[3];
t=(t+c)&BN_MASK2;
c=(t < c);
l=(t+b[3])&BN_MASK2;
c+=(l < t);
r[3]=l;
if (--n <= 0) break;
a+=4;
b+=4;
r+=4;
a+=4; b+=4; r+=4; n-=4;
}
#endif
while(n)
{
t=a[0];
t=(t+c)&BN_MASK2;
c=(t < c);
l=(t+b[0])&BN_MASK2;
c+=(l < t);
r[0]=l;
a++; b++; r++; n--;
}
return((BN_ULONG)c);
}
@ -390,36 +398,35 @@ BN_ULONG bn_sub_words(BN_ULONG *r, const BN_ULONG *a, const BN_ULONG *b, int n)
assert(n >= 0);
if (n <= 0) return((BN_ULONG)0);
for (;;)
#ifndef OPENSSL_SMALL_FOOTPRINT
while (n&~3)
{
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;
a+=4; b+=4; r+=4; n-=4;
}
#endif
while (n)
{
t1=a[0]; t2=b[0];
r[0]=(t1-t2-c)&BN_MASK2;
if (t1 != t2) c=(t1 < t2);
a++; b++; r++; n--;
}
return(c);
}
#ifdef BN_MUL_COMBA
#if defined(BN_MUL_COMBA) && !defined(OPENSSL_SMALL_FOOTPRINT)
#undef bn_mul_comba8
#undef bn_mul_comba4
@ -826,7 +833,7 @@ void bn_sqr_comba4(BN_ULONG *r, const BN_ULONG *a)
* This is essentially reference implementation, which may or may not
* result in performance improvement. E.g. on IA-32 this does give 40%
* faster rsa1024 private key operations and 10% faster rsa4096 ones,
* while on AMD64 it improves rsa1024 sign only by 10%, but *worsens*
* while on AMD64 it improves rsa1024 sign only by 10% and *worsens*
* rsa4096 sign by 15%. Once again, it's a reference implementation,
* one to be used as start-point for platform-specific assembler.
*/