wstart=bits-1; /* The top bit of the window */
wend=0; /* The bottom bit of the window */
+#if 1 /* by Shay Gueron's suggestion */
+ j = mont->N.top; /* borrow j */
+ if (bn_wexpand(r,j) == NULL) goto err;
+ r->d[0] = (0-m->d[0])&BN_MASK2; /* 2^(top*BN_BITS2) - m */
+ for(i=1;i<j;i++) r->d[i] = (~m->d[i])&BN_MASK2;
+ r->top = j;
+#else
if (!BN_to_montgomery(r,BN_value_one(),mont,ctx)) goto err;
+#endif
for (;;)
{
if (BN_is_bit_set(p,wstart) == 0)
start=0;
if (wstart < 0) break;
}
+#if defined(OPENSSL_BN_ASM_MONT) && (defined(__sparc__) || defined(__sparc))
+ if (OPENSSL_sparcv9cap_P[0]&(SPARCV9_VIS3|SPARCV9_PREFER_FPU))
+ {
+ j = mont->N.top; /* borrow j */
+ val[0]->d[0] = 1; /* borrow val[0] */
+ for (i=1;i<j;i++) val[0]->d[i] = 0;
+ val[0]->top = j;
+ if (!BN_mod_mul_montgomery(rr,r,val[0],mont,ctx)) goto err;
+ }
+ else
+#endif
if (!BN_from_montgomery(rr,r,mont,ctx)) goto err;
ret=1;
err:
return(ret);
}
+#if defined(OPENSSL_BN_ASM_MONT) && (defined(__sparc__) || defined(__sparc))
+static BN_ULONG bn_get_bits(const BIGNUM *a, int bitpos)
+ {
+ BN_ULONG ret=0;
+ int wordpos;
+
+ wordpos = bitpos/BN_BITS2;
+ bitpos %= BN_BITS2;
+ if (wordpos>=0 && wordpos < a->top)
+ {
+ ret = a->d[wordpos]&BN_MASK2;
+ if (bitpos)
+ {
+ ret >>= bitpos;
+ if (++wordpos < a->top)
+ ret |= a->d[wordpos]<<(BN_BITS2-bitpos);
+ }
+ }
+
+ return ret&BN_MASK2;
+}
+#endif
/* BN_mod_exp_mont_consttime() stores the precomputed powers in a specific layout
* so that accessing any of these table values shows the same access pattern as far
tmp.flags = am.flags = BN_FLG_STATIC_DATA;
/* prepare a^0 in Montgomery domain */
-#if 1
- if (!BN_to_montgomery(&tmp,BN_value_one(),mont,ctx)) goto err;
-#else
+#if 1 /* by Shay Gueron's suggestion */
tmp.d[0] = (0-m->d[0])&BN_MASK2; /* 2^(top*BN_BITS2) - m */
for (i=1;i<top;i++)
tmp.d[i] = (~m->d[i])&BN_MASK2;
tmp.top = top;
+#else
+ if (!BN_to_montgomery(&tmp,BN_value_one(),mont,ctx)) goto err;
#endif
/* prepare a^1 in Montgomery domain */
if (t4)
{
typedef int (*bn_pwr5_mont_f)(BN_ULONG *tp,const BN_ULONG *np,
- const BN_ULONG *n0,const void *table,int power);
+ const BN_ULONG *n0,const void *table,int power,int bits);
int bn_pwr5_mont_t4_8(BN_ULONG *tp,const BN_ULONG *np,
- const BN_ULONG *n0,const void *table,int power);
+ const BN_ULONG *n0,const void *table,int power,int bits);
int bn_pwr5_mont_t4_16(BN_ULONG *tp,const BN_ULONG *np,
- const BN_ULONG *n0,const void *table,int power);
+ const BN_ULONG *n0,const void *table,int power,int bits);
int bn_pwr5_mont_t4_24(BN_ULONG *tp,const BN_ULONG *np,
- const BN_ULONG *n0,const void *table,int power);
+ const BN_ULONG *n0,const void *table,int power,int bits);
int bn_pwr5_mont_t4_32(BN_ULONG *tp,const BN_ULONG *np,
- const BN_ULONG *n0,const void *table,int power);
- static const bn_pwr5_mont_f funcs[4] = {
+ const BN_ULONG *n0,const void *table,int power,int bits);
+ static const bn_pwr5_mont_f pwr5_funcs[4] = {
bn_pwr5_mont_t4_8, bn_pwr5_mont_t4_16,
bn_pwr5_mont_t4_24, bn_pwr5_mont_t4_32 };
- bn_pwr5_mont_f worker = funcs[top/16-1];
-
+ bn_pwr5_mont_f pwr5_worker = pwr5_funcs[top/16-1];
+
+ typedef int (*bn_mul_mont_f)(BN_ULONG *rp,const BN_ULONG *ap,
+ const void *bp,const BN_ULONG *np,const BN_ULONG *n0);
+ int bn_mul_mont_t4_8(BN_ULONG *rp,const BN_ULONG *ap,
+ const void *bp,const BN_ULONG *np,const BN_ULONG *n0);
+ int bn_mul_mont_t4_16(BN_ULONG *rp,const BN_ULONG *ap,
+ const void *bp,const BN_ULONG *np,const BN_ULONG *n0);
+ int bn_mul_mont_t4_24(BN_ULONG *rp,const BN_ULONG *ap,
+ const void *bp,const BN_ULONG *np,const BN_ULONG *n0);
+ int bn_mul_mont_t4_32(BN_ULONG *rp,const BN_ULONG *ap,
+ const void *bp,const BN_ULONG *np,const BN_ULONG *n0);
+ static const bn_mul_mont_f mul_funcs[4] = {
+ bn_mul_mont_t4_8, bn_mul_mont_t4_16,
+ bn_mul_mont_t4_24, bn_mul_mont_t4_32 };
+ bn_mul_mont_f mul_worker = mul_funcs[top/16-1];
+
+ void bn_mul_mont_vis3(BN_ULONG *rp,const BN_ULONG *ap,
+ const void *bp,const BN_ULONG *np,
+ const BN_ULONG *n0,int num);
void bn_mul_mont_t4(BN_ULONG *rp,const BN_ULONG *ap,
const void *bp,const BN_ULONG *np,
const BN_ULONG *n0,int num);
void bn_mul_mont_gather5_t4(BN_ULONG *rp,const BN_ULONG *ap,
const void *table,const BN_ULONG *np,
const BN_ULONG *n0,int num,int power);
- void bn_scatter5_t4(const BN_ULONG *inp,size_t num,
+ void bn_flip_n_scatter5_t4(const BN_ULONG *inp,size_t num,
void *table,size_t power);
void bn_gather5_t4(BN_ULONG *out,size_t num,
void *table,size_t power);
void bn_flip_t4(BN_ULONG *dst,BN_ULONG *src,size_t num);
- BN_ULONG *np=alloca(top*sizeof(BN_ULONG)), *n0=mont->n0;
+ BN_ULONG *np=mont->N.d, *n0=mont->n0;
+ int stride = 5*(6-(top/16-1)); /* multiple of 5, but less than 32 */
/* BN_to_montgomery can contaminate words above .top
* [in BN_DEBUG[_DEBUG] build]... */
for (i=am.top; i<top; i++) am.d[i]=0;
for (i=tmp.top; i<top; i++) tmp.d[i]=0;
- /* switch to 64-bit domain */
- top /= 2;
- bn_flip_t4(np,mont->N.d,top);
- bn_flip_t4(tmp.d,tmp.d,top);
- bn_flip_t4(am.d,am.d,top);
-
- bn_scatter5_t4(tmp.d,top,powerbuf,0);
- bn_scatter5_t4(am.d,top,powerbuf,1);
- bn_mul_mont_t4(tmp.d,am.d,am.d,np,n0,top);
- bn_scatter5_t4(tmp.d,top,powerbuf,2);
+ bn_flip_n_scatter5_t4(tmp.d,top,powerbuf,0);
+ bn_flip_n_scatter5_t4(am.d,top,powerbuf,1);
+ if (!(*mul_worker)(tmp.d,am.d,am.d,np,n0) &&
+ !(*mul_worker)(tmp.d,am.d,am.d,np,n0))
+ bn_mul_mont_vis3(tmp.d,am.d,am.d,np,n0,top);
+ bn_flip_n_scatter5_t4(tmp.d,top,powerbuf,2);
for (i=3; i<32; i++)
{
/* Calculate a^i = a^(i-1) * a */
- bn_mul_mont_gather5_t4(tmp.d,am.d,powerbuf,np,n0,top,i-1);
- bn_scatter5_t4(tmp.d,top,powerbuf,i);
+ if (!(*mul_worker)(tmp.d,tmp.d,am.d,np,n0) &&
+ !(*mul_worker)(tmp.d,tmp.d,am.d,np,n0))
+ bn_mul_mont_vis3(tmp.d,tmp.d,am.d,np,n0,top);
+ bn_flip_n_scatter5_t4(tmp.d,top,powerbuf,i);
}
+ /* switch to 64-bit domain */
+ np = alloca(top*sizeof(BN_ULONG));
+ top /= 2;
+ bn_flip_t4(np,mont->N.d,top);
+
bits--;
for (wvalue=0, i=bits%5; i>=0; i--,bits--)
wvalue = (wvalue<<1)+BN_is_bit_set(p,bits);
*/
while (bits >= 0)
{
- for (wvalue=0, i=0; i<5; i++,bits--)
- wvalue = (wvalue<<1)+BN_is_bit_set(p,bits);
+ if (bits < stride) stride = bits+1;
+ bits -= stride;
+ wvalue = bn_get_bits(p,bits+1);
- if ((*worker)(tmp.d,np,n0,powerbuf,wvalue)) continue;
+ if ((*pwr5_worker)(tmp.d,np,n0,powerbuf,wvalue,stride)) continue;
/* retry once and fall back */
- if ((*worker)(tmp.d,np,n0,powerbuf,wvalue)) continue;
+ if ((*pwr5_worker)(tmp.d,np,n0,powerbuf,wvalue,stride)) continue;
+
+ bits += stride-5;
+ wvalue >>= stride-5;
+ wvalue &= 31;
bn_mul_mont_t4(tmp.d,tmp.d,tmp.d,np,n0,top);
bn_mul_mont_t4(tmp.d,tmp.d,tmp.d,np,n0,top);
bn_mul_mont_t4(tmp.d,tmp.d,tmp.d,np,n0,top);
}
/* Convert the final result from montgomery to standard format */
+#if defined(OPENSSL_BN_ASM_MONT) && (defined(__sparc__) || defined(__sparc))
+ if (OPENSSL_sparcv9cap_P[0]&(SPARCV9_VIS3|SPARCV9_PREFER_FPU))
+ {
+ am.d[0] = 1; /* borrow am */
+ for (i=1;i<top;i++) am.d[i] = 0;
+ if (!BN_mod_mul_montgomery(rr,&tmp,&am,mont,ctx)) goto err;
+ }
+ else
+#endif
if (!BN_from_montgomery(rr,&tmp,mont,ctx)) goto err;
ret=1;
err:
projects / openssl.git / blobdiff