* [including the GNU Public Licence.]
*/
/* ====================================================================
- * Copyright (c) 1998-2000 The OpenSSL Project. All rights reserved.
+ * Copyright (c) 1998-2005 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
*
*/
+#define OPENSSL_FIPSAPI
#include "cryptlib.h"
#include "bn_lcl.h"
+#include <stdlib.h>
+#ifdef _WIN32
+# include <malloc.h>
+# ifndef alloca
+# define alloca _alloca
+# endif
+#elif defined(__GNUC__)
+# ifndef alloca
+# define alloca(s) __builtin_alloca((s))
+# endif
+#elif defined(__sun)
+# include <alloca.h>
+#endif
+
+#undef RSAZ_ENABLED
+#if defined(OPENSSL_BN_ASM_MONT) && \
+ (defined(__x86_64) || defined(__x86_64__) || \
+ defined(_M_AMD64) || defined(_M_X64))
+# include "rsaz_exp.h"
+# define RSAZ_ENABLED
+#endif
+
+#undef SPARC_T4_MONT
+#if defined(OPENSSL_BN_ASM_MONT) && (defined(__sparc__) || defined(__sparc))
+# include "sparc_arch.h"
+extern unsigned int OPENSSL_sparcv9cap_P[];
+# define SPARC_T4_MONT
+#endif
+
+/* maximum precomputation table size for *variable* sliding windows */
#define TABLE_SIZE 32
/* this one works - simple but works */
int i,bits,ret=0;
BIGNUM *v,*rr;
+ if (BN_get_flags(p, BN_FLG_CONSTTIME) != 0)
+ {
+ /* BN_FLG_CONSTTIME only supported by BN_mod_exp_mont() */
+ BNerr(BN_F_BN_EXP,ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
+ return -1;
+ }
+
BN_CTX_start(ctx);
if ((r == a) || (r == p))
rr = BN_CTX_get(ctx);
else
rr = r;
- if ((v = BN_CTX_get(ctx)) == NULL) goto err;
+ v = BN_CTX_get(ctx);
+ if (rr == NULL || v == NULL) goto err;
if (BN_copy(v,a) == NULL) goto err;
bits=BN_num_bits(p);
if (BN_is_odd(m))
{
# ifdef MONT_EXP_WORD
- if (a->top == 1 && !a->neg)
+ if (a->top == 1 && !a->neg && (BN_get_flags(p, BN_FLG_CONSTTIME) == 0))
{
BN_ULONG A = a->d[0];
ret=BN_mod_exp_mont_word(r,A,p,m,ctx,NULL);
const BIGNUM *m, BN_CTX *ctx)
{
int i,j,bits,ret=0,wstart,wend,window,wvalue;
- int start=1,ts=0;
+ int start=1;
BIGNUM *aa;
- BIGNUM val[TABLE_SIZE];
+ /* Table of variables obtained from 'ctx' */
+ BIGNUM *val[TABLE_SIZE];
BN_RECP_CTX recp;
+ if (BN_get_flags(p, BN_FLG_CONSTTIME) != 0)
+ {
+ /* BN_FLG_CONSTTIME only supported by BN_mod_exp_mont() */
+ BNerr(BN_F_BN_MOD_EXP_RECP,ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
+ return -1;
+ }
+
bits=BN_num_bits(p);
if (bits == 0)
}
BN_CTX_start(ctx);
- if ((aa = BN_CTX_get(ctx)) == NULL) goto err;
+ aa = BN_CTX_get(ctx);
+ val[0] = BN_CTX_get(ctx);
+ if(!aa || !val[0]) goto err;
BN_RECP_CTX_init(&recp);
if (m->neg)
if (BN_RECP_CTX_set(&recp,m,ctx) <= 0) goto err;
}
- BN_init(&(val[0]));
- ts=1;
-
- if (!BN_nnmod(&(val[0]),a,m,ctx)) goto err; /* 1 */
- if (BN_is_zero(&(val[0])))
+ if (!BN_nnmod(val[0],a,m,ctx)) goto err; /* 1 */
+ if (BN_is_zero(val[0]))
{
BN_zero(r);
ret = 1;
window = BN_window_bits_for_exponent_size(bits);
if (window > 1)
{
- if (!BN_mod_mul_reciprocal(aa,&(val[0]),&(val[0]),&recp,ctx))
+ if (!BN_mod_mul_reciprocal(aa,val[0],val[0],&recp,ctx))
goto err; /* 2 */
j=1<<(window-1);
for (i=1; i<j; i++)
{
- BN_init(&val[i]);
- if (!BN_mod_mul_reciprocal(&(val[i]),&(val[i-1]),aa,&recp,ctx))
+ if(((val[i] = BN_CTX_get(ctx)) == NULL) ||
+ !BN_mod_mul_reciprocal(val[i],val[i-1],
+ aa,&recp,ctx))
goto err;
}
- ts=i;
}
start=1; /* This is used to avoid multiplication etc
}
/* wvalue will be an odd number < 2^window */
- if (!BN_mod_mul_reciprocal(r,r,&(val[wvalue>>1]),&recp,ctx))
+ if (!BN_mod_mul_reciprocal(r,r,val[wvalue>>1],&recp,ctx))
goto err;
/* move the 'window' down further */
ret=1;
err:
BN_CTX_end(ctx);
- for (i=0; i<ts; i++)
- BN_clear_free(&(val[i]));
BN_RECP_CTX_free(&recp);
bn_check_top(r);
return(ret);
const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *in_mont)
{
int i,j,bits,ret=0,wstart,wend,window,wvalue;
- int start=1,ts=0;
+ int start=1;
BIGNUM *d,*r;
const BIGNUM *aa;
- /* TODO: BN_CTX??? */
- BIGNUM val[TABLE_SIZE];
+ /* Table of variables obtained from 'ctx' */
+ BIGNUM *val[TABLE_SIZE];
BN_MONT_CTX *mont=NULL;
+ if (BN_get_flags(p, BN_FLG_CONSTTIME) != 0)
+ {
+ return BN_mod_exp_mont_consttime(rr, a, p, m, ctx, in_mont);
+ }
+
bn_check_top(a);
bn_check_top(p);
bn_check_top(m);
BN_CTX_start(ctx);
d = BN_CTX_get(ctx);
r = BN_CTX_get(ctx);
- if (d == NULL || r == NULL) goto err;
+ val[0] = BN_CTX_get(ctx);
+ if (!d || !r || !val[0]) goto err;
/* If this is not done, things will break in the montgomery
* part */
if (!BN_MONT_CTX_set(mont,m,ctx)) goto err;
}
- BN_init(&val[0]);
- ts=1;
if (a->neg || BN_ucmp(a,m) >= 0)
{
- if (!BN_nnmod(&(val[0]),a,m,ctx))
+ if (!BN_nnmod(val[0],a,m,ctx))
goto err;
- aa= &(val[0]);
+ aa= val[0];
}
else
aa=a;
ret = 1;
goto err;
}
- if (!BN_to_montgomery(&(val[0]),aa,mont,ctx)) goto err; /* 1 */
+ if (!BN_to_montgomery(val[0],aa,mont,ctx)) goto err; /* 1 */
window = BN_window_bits_for_exponent_size(bits);
if (window > 1)
{
- if (!BN_mod_mul_montgomery(d,&(val[0]),&(val[0]),mont,ctx)) goto err; /* 2 */
+ if (!BN_mod_mul_montgomery(d,val[0],val[0],mont,ctx)) goto err; /* 2 */
j=1<<(window-1);
for (i=1; i<j; i++)
{
- BN_init(&(val[i]));
- if (!BN_mod_mul_montgomery(&(val[i]),&(val[i-1]),d,mont,ctx))
+ if(((val[i] = BN_CTX_get(ctx)) == NULL) ||
+ !BN_mod_mul_montgomery(val[i],val[i-1],
+ d,mont,ctx))
goto err;
}
- ts=i;
}
start=1; /* This is used to avoid multiplication etc
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 = m->top; /* borrow j */
+ if (m->d[j-1] & (((BN_ULONG)1)<<(BN_BITS2-1)))
+ {
+ if (bn_wexpand(r,j) == NULL) goto err;
+ /* 2^(top*BN_BITS2) - m */
+ r->d[0] = (0-m->d[0])&BN_MASK2;
+ for(i=1;i<j;i++) r->d[i] = (~m->d[i])&BN_MASK2;
+ r->top = j;
+ }
+ else
+#endif
if (!BN_to_montgomery(r,BN_value_one(),mont,ctx)) goto err;
for (;;)
{
}
/* wvalue will be an odd number < 2^window */
- if (!BN_mod_mul_montgomery(r,r,&(val[wvalue>>1]),mont,ctx))
+ if (!BN_mod_mul_montgomery(r,r,val[wvalue>>1],mont,ctx))
goto err;
/* move the 'window' down further */
start=0;
if (wstart < 0) break;
}
+#if defined(SPARC_T4_MONT)
+ 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:
if ((in_mont == NULL) && (mont != NULL)) BN_MONT_CTX_free(mont);
BN_CTX_end(ctx);
- for (i=0; i<ts; i++)
- BN_clear_free(&(val[i]));
bn_check_top(rr);
return(ret);
}
+#if defined(SPARC_T4_MONT)
+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
+ * as cache lines are concerned. The following functions are used to transfer a BIGNUM
+ * from/to that table. */
+
+static int MOD_EXP_CTIME_COPY_TO_PREBUF(const BIGNUM *b, int top, unsigned char *buf, int idx, int width)
+ {
+ size_t i, j;
+
+ if (top > b->top)
+ top = b->top; /* this works because 'buf' is explicitly zeroed */
+ for (i = 0, j=idx; i < top * sizeof b->d[0]; i++, j+=width)
+ {
+ buf[j] = ((unsigned char*)b->d)[i];
+ }
+
+ return 1;
+ }
+
+static int MOD_EXP_CTIME_COPY_FROM_PREBUF(BIGNUM *b, int top, unsigned char *buf, int idx, int width)
+ {
+ size_t i, j;
+
+ if (bn_wexpand(b, top) == NULL)
+ return 0;
+
+ for (i=0, j=idx; i < top * sizeof b->d[0]; i++, j+=width)
+ {
+ ((unsigned char*)b->d)[i] = buf[j];
+ }
+
+ b->top = top;
+ bn_correct_top(b);
+ return 1;
+ }
+
+/* Given a pointer value, compute the next address that is a cache line multiple. */
+#define MOD_EXP_CTIME_ALIGN(x_) \
+ ((unsigned char*)(x_) + (MOD_EXP_CTIME_MIN_CACHE_LINE_WIDTH - (((size_t)(x_)) & (MOD_EXP_CTIME_MIN_CACHE_LINE_MASK))))
+
+/* This variant of BN_mod_exp_mont() uses fixed windows and the special
+ * precomputation memory layout to limit data-dependency to a minimum
+ * to protect secret exponents (cf. the hyper-threading timing attacks
+ * pointed out by Colin Percival,
+ * http://www.daemonology.net/hyperthreading-considered-harmful/)
+ */
+int BN_mod_exp_mont_consttime(BIGNUM *rr, const BIGNUM *a, const BIGNUM *p,
+ const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *in_mont)
+ {
+ int i,bits,ret=0,window,wvalue;
+ int top;
+ BN_MONT_CTX *mont=NULL;
+
+ int numPowers;
+ unsigned char *powerbufFree=NULL;
+ int powerbufLen = 0;
+ unsigned char *powerbuf=NULL;
+ BIGNUM tmp, am;
+#if defined(SPARC_T4_MONT)
+ unsigned int t4=0;
+#endif
+
+ bn_check_top(a);
+ bn_check_top(p);
+ bn_check_top(m);
+
+ top = m->top;
+
+ if (!(m->d[0] & 1))
+ {
+ BNerr(BN_F_BN_MOD_EXP_MONT_CONSTTIME,BN_R_CALLED_WITH_EVEN_MODULUS);
+ return(0);
+ }
+ bits=BN_num_bits(p);
+ if (bits == 0)
+ {
+ ret = BN_one(rr);
+ return ret;
+ }
+
+ BN_CTX_start(ctx);
+
+ /* Allocate a montgomery context if it was not supplied by the caller.
+ * If this is not done, things will break in the montgomery part.
+ */
+ if (in_mont != NULL)
+ mont=in_mont;
+ else
+ {
+ if ((mont=BN_MONT_CTX_new()) == NULL) goto err;
+ if (!BN_MONT_CTX_set(mont,m,ctx)) goto err;
+ }
+
+#ifdef RSAZ_ENABLED
+ /*
+ * If the size of the operands allow it, perform the optimized
+ * RSAZ exponentiation. For further information see
+ * crypto/bn/rsaz_exp.c and accompanying assembly modules.
+ */
+ if ((16 == a->top) && (16 == p->top) && (BN_num_bits(m) == 1024)
+ && rsaz_avx2_eligible())
+ {
+ if (NULL == bn_wexpand(rr, 16)) goto err;
+ RSAZ_1024_mod_exp_avx2(rr->d, a->d, p->d, m->d, mont->RR.d, mont->n0[0]);
+ rr->top = 16;
+ rr->neg = 0;
+ bn_correct_top(rr);
+ ret = 1;
+ goto err;
+ }
+ else if ((8 == a->top) && (8 == p->top) && (BN_num_bits(m) == 512))
+ {
+ if (NULL == bn_wexpand(rr,8)) goto err;
+ RSAZ_512_mod_exp(rr->d, a->d, p->d, m->d, mont->n0[0], mont->RR.d);
+ rr->top = 8;
+ rr->neg = 0;
+ bn_correct_top(rr);
+ ret = 1;
+ goto err;
+ }
+#endif
+
+ /* Get the window size to use with size of p. */
+ window = BN_window_bits_for_ctime_exponent_size(bits);
+#if defined(SPARC_T4_MONT)
+ if (window>=5 && (top&15)==0 && top<=64 &&
+ (OPENSSL_sparcv9cap_P[1]&(CFR_MONTMUL|CFR_MONTSQR))==
+ (CFR_MONTMUL|CFR_MONTSQR) &&
+ (t4=OPENSSL_sparcv9cap_P[0]))
+ window=5;
+ else
+#endif
+#if defined(OPENSSL_BN_ASM_MONT5)
+ if (window==6 && bits<=1024) window=5; /* ~5% improvement of 2048-bit RSA sign */
+#endif
+ (void)0;
+
+ /* Allocate a buffer large enough to hold all of the pre-computed
+ * powers of am, am itself and tmp.
+ */
+ numPowers = 1 << window;
+ powerbufLen = sizeof(m->d[0])*(top*numPowers +
+ ((2*top)>numPowers?(2*top):numPowers));
+#ifdef alloca
+ if (powerbufLen < 3072)
+ powerbufFree = alloca(powerbufLen+MOD_EXP_CTIME_MIN_CACHE_LINE_WIDTH);
+ else
+#endif
+ if ((powerbufFree=(unsigned char*)OPENSSL_malloc(powerbufLen+MOD_EXP_CTIME_MIN_CACHE_LINE_WIDTH)) == NULL)
+ goto err;
+
+ powerbuf = MOD_EXP_CTIME_ALIGN(powerbufFree);
+ memset(powerbuf, 0, powerbufLen);
+
+#ifdef alloca
+ if (powerbufLen < 3072)
+ powerbufFree = NULL;
+#endif
+
+ /* lay down tmp and am right after powers table */
+ tmp.d = (BN_ULONG *)(powerbuf + sizeof(m->d[0])*top*numPowers);
+ am.d = tmp.d + top;
+ tmp.top = am.top = 0;
+ tmp.dmax = am.dmax = top;
+ tmp.neg = am.neg = 0;
+ tmp.flags = am.flags = BN_FLG_STATIC_DATA;
+
+ /* prepare a^0 in Montgomery domain */
+#if 1 /* by Shay Gueron's suggestion */
+ if (m->d[top-1] & (((BN_ULONG)1)<<(BN_BITS2-1)))
+ {
+ /* 2^(top*BN_BITS2) - m */
+ tmp.d[0] = (0-m->d[0])&BN_MASK2;
+ for (i=1;i<top;i++) tmp.d[i] = (~m->d[i])&BN_MASK2;
+ tmp.top = top;
+ }
+ else
+#endif
+ if (!BN_to_montgomery(&tmp,BN_value_one(),mont,ctx)) goto err;
+
+ /* prepare a^1 in Montgomery domain */
+ if (a->neg || BN_ucmp(a,m) >= 0)
+ {
+ if (!BN_mod(&am,a,m,ctx)) goto err;
+ if (!BN_to_montgomery(&am,&am,mont,ctx)) goto err;
+ }
+ else if (!BN_to_montgomery(&am,a,mont,ctx)) goto err;
+
+#if defined(SPARC_T4_MONT)
+ if (t4)
+ {
+ typedef int (*bn_pwr5_mont_f)(BN_ULONG *tp,const BN_ULONG *np,
+ 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,int bits);
+ int bn_pwr5_mont_t4_16(BN_ULONG *tp,const BN_ULONG *np,
+ 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,int bits);
+ int bn_pwr5_mont_t4_32(BN_ULONG *tp,const BN_ULONG *np,
+ 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 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_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=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;
+
+ 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 */
+ 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);
+ bn_gather5_t4(tmp.d,top,powerbuf,wvalue);
+
+ /* Scan the exponent one window at a time starting from the most
+ * significant bits.
+ */
+ while (bits >= 0)
+ {
+ if (bits < stride) stride = bits+1;
+ bits -= stride;
+ wvalue = bn_get_bits(p,bits+1);
+
+ if ((*pwr5_worker)(tmp.d,np,n0,powerbuf,wvalue,stride)) continue;
+ /* retry once and fall back */
+ 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);
+ 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_gather5_t4(tmp.d,tmp.d,powerbuf,np,n0,top,wvalue);
+ }
+
+ bn_flip_t4(tmp.d,tmp.d,top);
+ top *= 2;
+ /* back to 32-bit domain */
+ tmp.top=top;
+ bn_correct_top(&tmp);
+ OPENSSL_cleanse(np,top*sizeof(BN_ULONG));
+ }
+ else
+#endif
+#if defined(OPENSSL_BN_ASM_MONT5)
+ /* This optimization uses ideas from http://eprint.iacr.org/2011/239,
+ * specifically optimization of cache-timing attack countermeasures
+ * and pre-computation optimization. */
+
+ /* Dedicated window==4 case improves 512-bit RSA sign by ~15%, but as
+ * 512-bit RSA is hardly relevant, we omit it to spare size... */
+ if (window==5)
+ {
+ void bn_mul_mont_gather5(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(const BN_ULONG *inp,size_t num,
+ void *table,size_t power);
+ void bn_gather5(BN_ULONG *out,size_t num,
+ void *table,size_t power);
+
+ BN_ULONG *np=mont->N.d, *n0=mont->n0;
+
+ /* 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;
+
+ bn_scatter5(tmp.d,top,powerbuf,0);
+ bn_scatter5(am.d,am.top,powerbuf,1);
+ bn_mul_mont(tmp.d,am.d,am.d,np,n0,top);
+ bn_scatter5(tmp.d,top,powerbuf,2);
+
+#if 0
+ for (i=3; i<32; i++)
+ {
+ /* Calculate a^i = a^(i-1) * a */
+ bn_mul_mont_gather5(tmp.d,am.d,powerbuf,np,n0,top,i-1);
+ bn_scatter5(tmp.d,top,powerbuf,i);
+ }
+#else
+ /* same as above, but uses squaring for 1/2 of operations */
+ for (i=4; i<32; i*=2)
+ {
+ bn_mul_mont(tmp.d,tmp.d,tmp.d,np,n0,top);
+ bn_scatter5(tmp.d,top,powerbuf,i);
+ }
+ for (i=3; i<8; i+=2)
+ {
+ int j;
+ bn_mul_mont_gather5(tmp.d,am.d,powerbuf,np,n0,top,i-1);
+ bn_scatter5(tmp.d,top,powerbuf,i);
+ for (j=2*i; j<32; j*=2)
+ {
+ bn_mul_mont(tmp.d,tmp.d,tmp.d,np,n0,top);
+ bn_scatter5(tmp.d,top,powerbuf,j);
+ }
+ }
+ for (; i<16; i+=2)
+ {
+ bn_mul_mont_gather5(tmp.d,am.d,powerbuf,np,n0,top,i-1);
+ bn_scatter5(tmp.d,top,powerbuf,i);
+ bn_mul_mont(tmp.d,tmp.d,tmp.d,np,n0,top);
+ bn_scatter5(tmp.d,top,powerbuf,2*i);
+ }
+ for (; i<32; i+=2)
+ {
+ bn_mul_mont_gather5(tmp.d,am.d,powerbuf,np,n0,top,i-1);
+ bn_scatter5(tmp.d,top,powerbuf,i);
+ }
+#endif
+ bits--;
+ for (wvalue=0, i=bits%5; i>=0; i--,bits--)
+ wvalue = (wvalue<<1)+BN_is_bit_set(p,bits);
+ bn_gather5(tmp.d,top,powerbuf,wvalue);
+
+ /* Scan the exponent one window at a time starting from the most
+ * significant bits.
+ */
+ while (bits >= 0)
+ {
+ for (wvalue=0, i=0; i<5; i++,bits--)
+ wvalue = (wvalue<<1)+BN_is_bit_set(p,bits);
+
+ bn_mul_mont(tmp.d,tmp.d,tmp.d,np,n0,top);
+ bn_mul_mont(tmp.d,tmp.d,tmp.d,np,n0,top);
+ bn_mul_mont(tmp.d,tmp.d,tmp.d,np,n0,top);
+ bn_mul_mont(tmp.d,tmp.d,tmp.d,np,n0,top);
+ bn_mul_mont(tmp.d,tmp.d,tmp.d,np,n0,top);
+ bn_mul_mont_gather5(tmp.d,tmp.d,powerbuf,np,n0,top,wvalue);
+ }
+
+ tmp.top=top;
+ bn_correct_top(&tmp);
+ }
+ else
+#endif
+ {
+ if (!MOD_EXP_CTIME_COPY_TO_PREBUF(&tmp, top, powerbuf, 0, numPowers)) goto err;
+ if (!MOD_EXP_CTIME_COPY_TO_PREBUF(&am, top, powerbuf, 1, numPowers)) goto err;
+
+ /* If the window size is greater than 1, then calculate
+ * val[i=2..2^winsize-1]. Powers are computed as a*a^(i-1)
+ * (even powers could instead be computed as (a^(i/2))^2
+ * to use the slight performance advantage of sqr over mul).
+ */
+ if (window > 1)
+ {
+ if (!BN_mod_mul_montgomery(&tmp,&am,&am,mont,ctx)) goto err;
+ if (!MOD_EXP_CTIME_COPY_TO_PREBUF(&tmp, top, powerbuf, 2, numPowers)) goto err;
+ for (i=3; i<numPowers; i++)
+ {
+ /* Calculate a^i = a^(i-1) * a */
+ if (!BN_mod_mul_montgomery(&tmp,&am,&tmp,mont,ctx))
+ goto err;
+ if (!MOD_EXP_CTIME_COPY_TO_PREBUF(&tmp, top, powerbuf, i, numPowers)) goto err;
+ }
+ }
+
+ bits--;
+ for (wvalue=0, i=bits%window; i>=0; i--,bits--)
+ wvalue = (wvalue<<1)+BN_is_bit_set(p,bits);
+ if (!MOD_EXP_CTIME_COPY_FROM_PREBUF(&tmp,top,powerbuf,wvalue,numPowers)) goto err;
+
+ /* Scan the exponent one window at a time starting from the most
+ * significant bits.
+ */
+ while (bits >= 0)
+ {
+ wvalue=0; /* The 'value' of the window */
+
+ /* Scan the window, squaring the result as we go */
+ for (i=0; i<window; i++,bits--)
+ {
+ if (!BN_mod_mul_montgomery(&tmp,&tmp,&tmp,mont,ctx)) goto err;
+ wvalue = (wvalue<<1)+BN_is_bit_set(p,bits);
+ }
+
+ /* Fetch the appropriate pre-computed value from the pre-buf */
+ if (!MOD_EXP_CTIME_COPY_FROM_PREBUF(&am, top, powerbuf, wvalue, numPowers)) goto err;
+
+ /* Multiply the result into the intermediate result */
+ if (!BN_mod_mul_montgomery(&tmp,&tmp,&am,mont,ctx)) goto err;
+ }
+ }
+
+ /* Convert the final result from montgomery to standard format */
+#if defined(SPARC_T4_MONT)
+ 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:
+ if ((in_mont == NULL) && (mont != NULL)) BN_MONT_CTX_free(mont);
+ if (powerbuf!=NULL)
+ {
+ OPENSSL_cleanse(powerbuf,powerbufLen);
+ if (powerbufFree) OPENSSL_free(powerbufFree);
+ }
+ BN_CTX_end(ctx);
+ return(ret);
+ }
+
int BN_mod_exp_mont_word(BIGNUM *rr, BN_ULONG a, const BIGNUM *p,
const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *in_mont)
{
#define BN_TO_MONTGOMERY_WORD(r, w, mont) \
(BN_set_word(r, (w)) && BN_to_montgomery(r, r, (mont), ctx))
+ if (BN_get_flags(p, BN_FLG_CONSTTIME) != 0)
+ {
+ /* BN_FLG_CONSTTIME only supported by BN_mod_exp_mont() */
+ BNerr(BN_F_BN_MOD_EXP_MONT_WORD,ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
+ return -1;
+ }
+
bn_check_top(p);
bn_check_top(m);
bits = BN_num_bits(p);
if (bits == 0)
{
- ret = BN_one(rr);
+ /* x**0 mod 1 is still zero. */
+ if (BN_is_one(m))
+ {
+ ret = 1;
+ BN_zero(rr);
+ }
+ else
+ ret = BN_one(rr);
return ret;
}
if (a == 0)
int BN_mod_exp_simple(BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
const BIGNUM *m, BN_CTX *ctx)
{
- int i,j,bits,ret=0,wstart,wend,window,wvalue,ts=0;
+ int i,j,bits,ret=0,wstart,wend,window,wvalue;
int start=1;
BIGNUM *d;
- /* TODO: BN_CTX?? */
- BIGNUM val[TABLE_SIZE];
+ /* Table of variables obtained from 'ctx' */
+ BIGNUM *val[TABLE_SIZE];
+
+ if (BN_get_flags(p, BN_FLG_CONSTTIME) != 0)
+ {
+ /* BN_FLG_CONSTTIME only supported by BN_mod_exp_mont() */
+ BNerr(BN_F_BN_MOD_EXP_SIMPLE,ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
+ return -1;
+ }
bits=BN_num_bits(p);
}
BN_CTX_start(ctx);
- if ((d = BN_CTX_get(ctx)) == NULL) goto err;
+ d = BN_CTX_get(ctx);
+ val[0] = BN_CTX_get(ctx);
+ if(!d || !val[0]) goto err;
- BN_init(&(val[0]));
- ts=1;
- if (!BN_nnmod(&(val[0]),a,m,ctx)) goto err; /* 1 */
- if (BN_is_zero(&(val[0])))
+ if (!BN_nnmod(val[0],a,m,ctx)) goto err; /* 1 */
+ if (BN_is_zero(val[0]))
{
BN_zero(r);
ret = 1;
window = BN_window_bits_for_exponent_size(bits);
if (window > 1)
{
- if (!BN_mod_mul(d,&(val[0]),&(val[0]),m,ctx))
+ if (!BN_mod_mul(d,val[0],val[0],m,ctx))
goto err; /* 2 */
j=1<<(window-1);
for (i=1; i<j; i++)
{
- BN_init(&(val[i]));
- if (!BN_mod_mul(&(val[i]),&(val[i-1]),d,m,ctx))
+ if(((val[i] = BN_CTX_get(ctx)) == NULL) ||
+ !BN_mod_mul(val[i],val[i-1],d,m,ctx))
goto err;
}
- ts=i;
}
start=1; /* This is used to avoid multiplication etc
}
/* wvalue will be an odd number < 2^window */
- if (!BN_mod_mul(r,r,&(val[wvalue>>1]),m,ctx))
+ if (!BN_mod_mul(r,r,val[wvalue>>1],m,ctx))
goto err;
/* move the 'window' down further */
ret=1;
err:
BN_CTX_end(ctx);
- for (i=0; i<ts; i++)
- BN_clear_free(&(val[i]));
bn_check_top(r);
return(ret);
}
-
projects / openssl.git / blobdiff