* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* The implementation was written so as to conform with Netscapes SSL.
- *
+ *
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
- *
+ *
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
- *
+ *
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* Eric Young (eay@cryptsoft.com)"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
- * 4. If you include any Windows specific code (or a derivative thereof) from
+ * 4. If you include any Windows specific code (or a derivative thereof) from
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
- *
+ *
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
- *
+ *
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* are met:
*
* 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
+ * notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
#include "cryptlib.h"
#include "bn_lcl.h"
-#define MONT_WORD /* use the faster word-based algorithm */
+#define MONT_WORD /* use the faster word-based algorithm */
#if defined(MONT_WORD) && defined(OPENSSL_BN_ASM_MONT) && (BN_BITS2<=32)
-/* This condition means we have a specific non-default build:
- * In the 0.9.8 branch, OPENSSL_BN_ASM_MONT is normally not set for any
- * BN_BITS2<=32 platform; an explicit "enable-montasm" is required.
- * I.e., if we are here, the user intentionally deviates from the
- * normal stable build to get better Montgomery performance from
- * the 0.9.9-dev backport.
- *
- * In this case only, we also enable BN_from_montgomery_word()
- * (another non-stable feature from 0.9.9-dev).
+/*
+ * This condition means we have a specific non-default build: In the 0.9.8
+ * branch, OPENSSL_BN_ASM_MONT is normally not set for any BN_BITS2<=32
+ * platform; an explicit "enable-montasm" is required. I.e., if we are here,
+ * the user intentionally deviates from the normal stable build to get better
+ * Montgomery performance from the 0.9.9-dev backport. In this case only, we
+ * also enable BN_from_montgomery_word() (another non-stable feature from
+ * 0.9.9-dev).
*/
-#define MONT_FROM_WORD___NON_DEFAULT_0_9_8_BUILD
+# define MONT_FROM_WORD___NON_DEFAULT_0_9_8_BUILD
#endif
#ifdef MONT_FROM_WORD___NON_DEFAULT_0_9_8_BUILD
static int BN_from_montgomery_word(BIGNUM *ret, BIGNUM *r, BN_MONT_CTX *mont);
#endif
-
-
int BN_mod_mul_montgomery(BIGNUM *r, const BIGNUM *a, const BIGNUM *b,
- BN_MONT_CTX *mont, BN_CTX *ctx)
- {
- BIGNUM *tmp;
- int ret=0;
+ BN_MONT_CTX *mont, BN_CTX *ctx)
+{
+ BIGNUM *tmp;
+ int ret = 0;
#if defined(OPENSSL_BN_ASM_MONT) && defined(MONT_WORD)
- int num = mont->N.top;
+ int num = mont->N.top;
- if (num>1 && a->top==num && b->top==num)
- {
- if (bn_wexpand(r,num) == NULL) return(0);
-#if 0 /* for OpenSSL 0.9.9 mont->n0 */
- if (bn_mul_mont(r->d,a->d,b->d,mont->N.d,mont->n0,num))
-#else
- if (bn_mul_mont(r->d,a->d,b->d,mont->N.d,&mont->n0,num))
-#endif
- {
- r->neg = a->neg^b->neg;
- r->top = num;
- bn_correct_top(r);
- return(1);
- }
- }
+ if (num > 1 && a->top == num && b->top == num) {
+ if (bn_wexpand(r, num) == NULL)
+ return (0);
+# if 0 /* for OpenSSL 0.9.9 mont->n0 */
+ if (bn_mul_mont(r->d, a->d, b->d, mont->N.d, mont->n0, num))
+# else
+ if (bn_mul_mont(r->d, a->d, b->d, mont->N.d, &mont->n0, num))
+# endif
+ {
+ r->neg = a->neg ^ b->neg;
+ r->top = num;
+ bn_correct_top(r);
+ return (1);
+ }
+ }
#endif
- BN_CTX_start(ctx);
- tmp = BN_CTX_get(ctx);
- if (tmp == NULL) goto err;
-
- bn_check_top(tmp);
- if (a == b)
- {
- if (!BN_sqr(tmp,a,ctx)) goto err;
- }
- else
- {
- if (!BN_mul(tmp,a,b,ctx)) goto err;
- }
- /* reduce from aRR to aR */
+ BN_CTX_start(ctx);
+ tmp = BN_CTX_get(ctx);
+ if (tmp == NULL)
+ goto err;
+
+ bn_check_top(tmp);
+ if (a == b) {
+ if (!BN_sqr(tmp, a, ctx))
+ goto err;
+ } else {
+ if (!BN_mul(tmp, a, b, ctx))
+ goto err;
+ }
+ /* reduce from aRR to aR */
#ifdef MONT_FROM_WORD___NON_DEFAULT_0_9_8_BUILD
- if (!BN_from_montgomery_word(r,tmp,mont)) goto err;
+ if (!BN_from_montgomery_word(r, tmp, mont))
+ goto err;
#else
- if (!BN_from_montgomery(r,tmp,mont,ctx)) goto err;
+ if (!BN_from_montgomery(r, tmp, mont, ctx))
+ goto err;
#endif
- bn_check_top(r);
- ret=1;
-err:
- BN_CTX_end(ctx);
- return(ret);
- }
+ bn_check_top(r);
+ ret = 1;
+ err:
+ BN_CTX_end(ctx);
+ return (ret);
+}
#ifdef MONT_FROM_WORD___NON_DEFAULT_0_9_8_BUILD
static int BN_from_montgomery_word(BIGNUM *ret, BIGNUM *r, BN_MONT_CTX *mont)
- {
- BIGNUM *n;
- BN_ULONG *ap,*np,*rp,n0,v,*nrp;
- int al,nl,max,i,x,ri;
-
- n= &(mont->N);
- /* mont->ri is the size of mont->N in bits (rounded up
- to the word size) */
- al=ri=mont->ri/BN_BITS2;
-
- nl=n->top;
- if ((al == 0) || (nl == 0)) { ret->top=0; return(1); }
-
- max=(nl+al+1); /* allow for overflow (no?) XXX */
- if (bn_wexpand(r,max) == NULL) return(0);
-
- r->neg^=n->neg;
- np=n->d;
- rp=r->d;
- nrp= &(r->d[nl]);
-
- /* clear the top words of T */
- for (i=r->top; i<max; i++) /* memset? XXX */
- r->d[i]=0;
-
- r->top=max;
-#if 0 /* for OpenSSL 0.9.9 mont->n0 */
- n0=mont->n0[0];
-#else
- n0=mont->n0;
-#endif
+{
+ BIGNUM *n;
+ BN_ULONG *ap, *np, *rp, n0, v, *nrp;
+ int al, nl, max, i, x, ri;
+
+ n = &(mont->N);
+ /*
+ * mont->ri is the size of mont->N in bits (rounded up to the word size)
+ */
+ al = ri = mont->ri / BN_BITS2;
+
+ nl = n->top;
+ if ((al == 0) || (nl == 0)) {
+ ret->top = 0;
+ return (1);
+ }
+
+ max = (nl + al + 1); /* allow for overflow (no?) XXX */
+ if (bn_wexpand(r, max) == NULL)
+ return (0);
+
+ r->neg ^= n->neg;
+ np = n->d;
+ rp = r->d;
+ nrp = &(r->d[nl]);
+
+ /* clear the top words of T */
+ for (i = r->top; i < max; i++) /* memset? XXX */
+ r->d[i] = 0;
+
+ r->top = max;
+# if 0 /* for OpenSSL 0.9.9 mont->n0 */
+ n0 = mont->n0[0];
+# else
+ n0 = mont->n0;
+# endif
-#ifdef BN_COUNT
- fprintf(stderr,"word BN_from_montgomery_word %d * %d\n",nl,nl);
-#endif
- for (i=0; i<nl; i++)
- {
-#ifdef __TANDEM
- {
- long long t1;
- long long t2;
- long long t3;
- t1 = rp[0] * (n0 & 0177777);
- t2 = 037777600000l;
- t2 = n0 & t2;
- t3 = rp[0] & 0177777;
- t2 = (t3 * t2) & BN_MASK2;
- t1 = t1 + t2;
- v=bn_mul_add_words(rp,np,nl,(BN_ULONG) t1);
- }
-#else
- v=bn_mul_add_words(rp,np,nl,(rp[0]*n0)&BN_MASK2);
-#endif
- nrp++;
- rp++;
- if (((nrp[-1]+=v)&BN_MASK2) >= v)
- continue;
- else
- {
- if (((++nrp[0])&BN_MASK2) != 0) continue;
- if (((++nrp[1])&BN_MASK2) != 0) continue;
- for (x=2; (((++nrp[x])&BN_MASK2) == 0); x++) ;
- }
- }
- bn_correct_top(r);
-
- /* mont->ri will be a multiple of the word size and below code
- * is kind of BN_rshift(ret,r,mont->ri) equivalent */
- if (r->top <= ri)
- {
- ret->top=0;
- return(1);
- }
- al=r->top-ri;
-
- if (bn_wexpand(ret,ri) == NULL) return(0);
- x=0-(((al-ri)>>(sizeof(al)*8-1))&1);
- ret->top=x=(ri&~x)|(al&x); /* min(ri,al) */
- ret->neg=r->neg;
-
- rp=ret->d;
- ap=&(r->d[ri]);
-
- {
- size_t m1,m2;
-
- v=bn_sub_words(rp,ap,np,ri);
- /* this ----------------^^ works even in al<ri case
- * thanks to zealous zeroing of top of the vector in the
- * beginning. */
-
- /* if (al==ri && !v) || al>ri) nrp=rp; else nrp=ap; */
- /* in other words if subtraction result is real, then
- * trick unconditional memcpy below to perform in-place
- * "refresh" instead of actual copy. */
- m1=0-(size_t)(((al-ri)>>(sizeof(al)*8-1))&1); /* al<ri */
- m2=0-(size_t)(((ri-al)>>(sizeof(al)*8-1))&1); /* al>ri */
- m1|=m2; /* (al!=ri) */
- m1|=(0-(size_t)v); /* (al!=ri || v) */
- m1&=~m2; /* (al!=ri || v) && !al>ri */
- nrp=(BN_ULONG *)(((size_t)rp&~m1)|((size_t)ap&m1));
- }
-
- /* 'i<ri' is chosen to eliminate dependency on input data, even
- * though it results in redundant copy in al<ri case. */
- for (i=0,ri-=4; i<ri; i+=4)
- {
- BN_ULONG t1,t2,t3,t4;
-
- t1=nrp[i+0];
- t2=nrp[i+1];
- t3=nrp[i+2]; ap[i+0]=0;
- t4=nrp[i+3]; ap[i+1]=0;
- rp[i+0]=t1; ap[i+2]=0;
- rp[i+1]=t2; ap[i+3]=0;
- rp[i+2]=t3;
- rp[i+3]=t4;
- }
- for (ri+=4; i<ri; i++)
- rp[i]=nrp[i], ap[i]=0;
- bn_correct_top(r);
- bn_correct_top(ret);
- bn_check_top(ret);
-
- return(1);
- }
+# ifdef BN_COUNT
+ fprintf(stderr, "word BN_from_montgomery_word %d * %d\n", nl, nl);
+# endif
+ for (i = 0; i < nl; i++) {
+# ifdef __TANDEM
+ {
+ long long t1;
+ long long t2;
+ long long t3;
+ t1 = rp[0] * (n0 & 0177777);
+ t2 = 037777600000l;
+ t2 = n0 & t2;
+ t3 = rp[0] & 0177777;
+ t2 = (t3 * t2) & BN_MASK2;
+ t1 = t1 + t2;
+ v = bn_mul_add_words(rp, np, nl, (BN_ULONG)t1);
+ }
+# else
+ v = bn_mul_add_words(rp, np, nl, (rp[0] * n0) & BN_MASK2);
+# endif
+ nrp++;
+ rp++;
+ if (((nrp[-1] += v) & BN_MASK2) >= v)
+ continue;
+ else {
+ if (((++nrp[0]) & BN_MASK2) != 0)
+ continue;
+ if (((++nrp[1]) & BN_MASK2) != 0)
+ continue;
+ for (x = 2; (((++nrp[x]) & BN_MASK2) == 0); x++) ;
+ }
+ }
+ bn_correct_top(r);
+
+ /*
+ * mont->ri will be a multiple of the word size and below code is kind of
+ * BN_rshift(ret,r,mont->ri) equivalent
+ */
+ if (r->top <= ri) {
+ ret->top = 0;
+ return (1);
+ }
+ al = r->top - ri;
+
+ if (bn_wexpand(ret, ri) == NULL)
+ return (0);
+ x = 0 - (((al - ri) >> (sizeof(al) * 8 - 1)) & 1);
+ ret->top = x = (ri & ~x) | (al & x); /* min(ri,al) */
+ ret->neg = r->neg;
+
+ rp = ret->d;
+ ap = &(r->d[ri]);
+
+ {
+ size_t m1, m2;
+
+ v = bn_sub_words(rp, ap, np, ri);
+ /*
+ * this ----------------^^ works even in al<ri case thanks to zealous
+ * zeroing of top of the vector in the beginning.
+ */
+
+ /* if (al==ri && !v) || al>ri) nrp=rp; else nrp=ap; */
+ /*
+ * in other words if subtraction result is real, then trick
+ * unconditional memcpy below to perform in-place "refresh" instead
+ * of actual copy.
+ */
+ m1 = 0 - (size_t)(((al - ri) >> (sizeof(al) * 8 - 1)) & 1); /* al<ri */
+ m2 = 0 - (size_t)(((ri - al) >> (sizeof(al) * 8 - 1)) & 1); /* al>ri */
+ m1 |= m2; /* (al!=ri) */
+ m1 |= (0 - (size_t)v); /* (al!=ri || v) */
+ m1 &= ~m2; /* (al!=ri || v) && !al>ri */
+ nrp = (BN_ULONG *)(((size_t)rp & ~m1) | ((size_t)ap & m1));
+ }
+
+ /*
+ * 'i<ri' is chosen to eliminate dependency on input data, even though it
+ * results in redundant copy in al<ri case.
+ */
+ for (i = 0, ri -= 4; i < ri; i += 4) {
+ BN_ULONG t1, t2, t3, t4;
+
+ t1 = nrp[i + 0];
+ t2 = nrp[i + 1];
+ t3 = nrp[i + 2];
+ ap[i + 0] = 0;
+ t4 = nrp[i + 3];
+ ap[i + 1] = 0;
+ rp[i + 0] = t1;
+ ap[i + 2] = 0;
+ rp[i + 1] = t2;
+ ap[i + 3] = 0;
+ rp[i + 2] = t3;
+ rp[i + 3] = t4;
+ }
+ for (ri += 4; i < ri; i++)
+ rp[i] = nrp[i], ap[i] = 0;
+ bn_correct_top(r);
+ bn_correct_top(ret);
+ bn_check_top(ret);
+
+ return (1);
+}
int BN_from_montgomery(BIGNUM *ret, const BIGNUM *a, BN_MONT_CTX *mont,
- BN_CTX *ctx)
- {
- int retn=0;
- BIGNUM *t;
+ BN_CTX *ctx)
+{
+ int retn = 0;
+ BIGNUM *t;
- BN_CTX_start(ctx);
- if ((t = BN_CTX_get(ctx)) && BN_copy(t,a))
- retn = BN_from_montgomery_word(ret,t,mont);
- BN_CTX_end(ctx);
- return retn;
- }
+ BN_CTX_start(ctx);
+ if ((t = BN_CTX_get(ctx)) && BN_copy(t, a))
+ retn = BN_from_montgomery_word(ret, t, mont);
+ BN_CTX_end(ctx);
+ return retn;
+}
-#else /* !MONT_FROM_WORD___NON_DEFAULT_0_9_8_BUILD */
+#else /* !MONT_FROM_WORD___NON_DEFAULT_0_9_8_BUILD */
int BN_from_montgomery(BIGNUM *ret, const BIGNUM *a, BN_MONT_CTX *mont,
- BN_CTX *ctx)
- {
- int retn=0;
-
-#ifdef MONT_WORD
- BIGNUM *n,*r;
- BN_ULONG *ap,*np,*rp,n0,v,*nrp;
- int al,nl,max,i,x,ri;
-
- BN_CTX_start(ctx);
- if ((r = BN_CTX_get(ctx)) == NULL) goto err;
-
- if (!BN_copy(r,a)) goto err;
- n= &(mont->N);
-
- ap=a->d;
- /* mont->ri is the size of mont->N in bits (rounded up
- to the word size) */
- al=ri=mont->ri/BN_BITS2;
-
- nl=n->top;
- if ((al == 0) || (nl == 0)) { r->top=0; return(1); }
-
- max=(nl+al+1); /* allow for overflow (no?) XXX */
- if (bn_wexpand(r,max) == NULL) goto err;
-
- r->neg=a->neg^n->neg;
- np=n->d;
- rp=r->d;
- nrp= &(r->d[nl]);
-
- /* clear the top words of T */
-#if 1
- for (i=r->top; i<max; i++) /* memset? XXX */
- r->d[i]=0;
-#else
- memset(&(r->d[r->top]),0,(max-r->top)*sizeof(BN_ULONG));
-#endif
-
- r->top=max;
- n0=mont->n0;
-
-#ifdef BN_COUNT
- fprintf(stderr,"word BN_from_montgomery %d * %d\n",nl,nl);
-#endif
- for (i=0; i<nl; i++)
- {
-#ifdef __TANDEM
- {
- long long t1;
- long long t2;
- long long t3;
- t1 = rp[0] * (n0 & 0177777);
- t2 = 037777600000l;
- t2 = n0 & t2;
- t3 = rp[0] & 0177777;
- t2 = (t3 * t2) & BN_MASK2;
- t1 = t1 + t2;
- v=bn_mul_add_words(rp,np,nl,(BN_ULONG) t1);
- }
-#else
- v=bn_mul_add_words(rp,np,nl,(rp[0]*n0)&BN_MASK2);
-#endif
- nrp++;
- rp++;
- if (((nrp[-1]+=v)&BN_MASK2) >= v)
- continue;
- else
- {
- if (((++nrp[0])&BN_MASK2) != 0) continue;
- if (((++nrp[1])&BN_MASK2) != 0) continue;
- for (x=2; (((++nrp[x])&BN_MASK2) == 0); x++) ;
- }
- }
- bn_correct_top(r);
-
- /* mont->ri will be a multiple of the word size and below code
- * is kind of BN_rshift(ret,r,mont->ri) equivalent */
- if (r->top <= ri)
- {
- ret->top=0;
- retn=1;
- goto err;
- }
- al=r->top-ri;
-
-# define BRANCH_FREE 1
-# if BRANCH_FREE
- if (bn_wexpand(ret,ri) == NULL) goto err;
- x=0-(((al-ri)>>(sizeof(al)*8-1))&1);
- ret->top=x=(ri&~x)|(al&x); /* min(ri,al) */
- ret->neg=r->neg;
-
- rp=ret->d;
- ap=&(r->d[ri]);
-
- {
- size_t m1,m2;
-
- v=bn_sub_words(rp,ap,np,ri);
- /* this ----------------^^ works even in al<ri case
- * thanks to zealous zeroing of top of the vector in the
- * beginning. */
-
- /* if (al==ri && !v) || al>ri) nrp=rp; else nrp=ap; */
- /* in other words if subtraction result is real, then
- * trick unconditional memcpy below to perform in-place
- * "refresh" instead of actual copy. */
- m1=0-(size_t)(((al-ri)>>(sizeof(al)*8-1))&1); /* al<ri */
- m2=0-(size_t)(((ri-al)>>(sizeof(al)*8-1))&1); /* al>ri */
- m1|=m2; /* (al!=ri) */
- m1|=(0-(size_t)v); /* (al!=ri || v) */
- m1&=~m2; /* (al!=ri || v) && !al>ri */
- nrp=(BN_ULONG *)(((size_t)rp&~m1)|((size_t)ap&m1));
- }
-
- /* 'i<ri' is chosen to eliminate dependency on input data, even
- * though it results in redundant copy in al<ri case. */
- for (i=0,ri-=4; i<ri; i+=4)
- {
- BN_ULONG t1,t2,t3,t4;
-
- t1=nrp[i+0];
- t2=nrp[i+1];
- t3=nrp[i+2]; ap[i+0]=0;
- t4=nrp[i+3]; ap[i+1]=0;
- rp[i+0]=t1; ap[i+2]=0;
- rp[i+1]=t2; ap[i+3]=0;
- rp[i+2]=t3;
- rp[i+3]=t4;
- }
- for (ri+=4; i<ri; i++)
- rp[i]=nrp[i], ap[i]=0;
- bn_correct_top(r);
- bn_correct_top(ret);
-# else
- if (bn_wexpand(ret,al) == NULL) goto err;
- ret->top=al;
- ret->neg=r->neg;
-
- rp=ret->d;
- ap=&(r->d[ri]);
- al-=4;
- for (i=0; i<al; i+=4)
- {
- BN_ULONG t1,t2,t3,t4;
-
- t1=ap[i+0];
- t2=ap[i+1];
- t3=ap[i+2];
- t4=ap[i+3];
- rp[i+0]=t1;
- rp[i+1]=t2;
- rp[i+2]=t3;
- rp[i+3]=t4;
- }
- al+=4;
- for (; i<al; i++)
- rp[i]=ap[i];
+ BN_CTX *ctx)
+{
+ int retn = 0;
+
+# ifdef MONT_WORD
+ BIGNUM *n, *r;
+ BN_ULONG *ap, *np, *rp, n0, v, *nrp;
+ int al, nl, max, i, x, ri;
+
+ BN_CTX_start(ctx);
+ if ((r = BN_CTX_get(ctx)) == NULL)
+ goto err;
+
+ if (!BN_copy(r, a))
+ goto err;
+ n = &(mont->N);
+
+ ap = a->d;
+ /*
+ * mont->ri is the size of mont->N in bits (rounded up to the word size)
+ */
+ al = ri = mont->ri / BN_BITS2;
+
+ nl = n->top;
+ if ((al == 0) || (nl == 0)) {
+ r->top = 0;
+ return (1);
+ }
+
+ max = (nl + al + 1); /* allow for overflow (no?) XXX */
+ if (bn_wexpand(r, max) == NULL)
+ goto err;
+
+ r->neg = a->neg ^ n->neg;
+ np = n->d;
+ rp = r->d;
+ nrp = &(r->d[nl]);
+
+ /* clear the top words of T */
+# if 1
+ for (i = r->top; i < max; i++) /* memset? XXX */
+ r->d[i] = 0;
+# else
+ memset(&(r->d[r->top]), 0, (max - r->top) * sizeof(BN_ULONG));
+# endif
+
+ r->top = max;
+ n0 = mont->n0;
+
+# ifdef BN_COUNT
+ fprintf(stderr, "word BN_from_montgomery %d * %d\n", nl, nl);
+# endif
+ for (i = 0; i < nl; i++) {
+# ifdef __TANDEM
+ {
+ long long t1;
+ long long t2;
+ long long t3;
+ t1 = rp[0] * (n0 & 0177777);
+ t2 = 037777600000l;
+ t2 = n0 & t2;
+ t3 = rp[0] & 0177777;
+ t2 = (t3 * t2) & BN_MASK2;
+ t1 = t1 + t2;
+ v = bn_mul_add_words(rp, np, nl, (BN_ULONG)t1);
+ }
+# else
+ v = bn_mul_add_words(rp, np, nl, (rp[0] * n0) & BN_MASK2);
+# endif
+ nrp++;
+ rp++;
+ if (((nrp[-1] += v) & BN_MASK2) >= v)
+ continue;
+ else {
+ if (((++nrp[0]) & BN_MASK2) != 0)
+ continue;
+ if (((++nrp[1]) & BN_MASK2) != 0)
+ continue;
+ for (x = 2; (((++nrp[x]) & BN_MASK2) == 0); x++) ;
+ }
+ }
+ bn_correct_top(r);
+
+ /*
+ * mont->ri will be a multiple of the word size and below code is kind of
+ * BN_rshift(ret,r,mont->ri) equivalent
+ */
+ if (r->top <= ri) {
+ ret->top = 0;
+ retn = 1;
+ goto err;
+ }
+ al = r->top - ri;
+
+# define BRANCH_FREE 1
+# if BRANCH_FREE
+ if (bn_wexpand(ret, ri) == NULL)
+ goto err;
+ x = 0 - (((al - ri) >> (sizeof(al) * 8 - 1)) & 1);
+ ret->top = x = (ri & ~x) | (al & x); /* min(ri,al) */
+ ret->neg = r->neg;
+
+ rp = ret->d;
+ ap = &(r->d[ri]);
+
+ {
+ size_t m1, m2;
+
+ v = bn_sub_words(rp, ap, np, ri);
+ /*
+ * this ----------------^^ works even in al<ri case thanks to zealous
+ * zeroing of top of the vector in the beginning.
+ */
+
+ /* if (al==ri && !v) || al>ri) nrp=rp; else nrp=ap; */
+ /*
+ * in other words if subtraction result is real, then trick
+ * unconditional memcpy below to perform in-place "refresh" instead
+ * of actual copy.
+ */
+ m1 = 0 - (size_t)(((al - ri) >> (sizeof(al) * 8 - 1)) & 1); /* al<ri */
+ m2 = 0 - (size_t)(((ri - al) >> (sizeof(al) * 8 - 1)) & 1); /* al>ri */
+ m1 |= m2; /* (al!=ri) */
+ m1 |= (0 - (size_t)v); /* (al!=ri || v) */
+ m1 &= ~m2; /* (al!=ri || v) && !al>ri */
+ nrp = (BN_ULONG *)(((size_t)rp & ~m1) | ((size_t)ap & m1));
+ }
+
+ /*
+ * 'i<ri' is chosen to eliminate dependency on input data, even though it
+ * results in redundant copy in al<ri case.
+ */
+ for (i = 0, ri -= 4; i < ri; i += 4) {
+ BN_ULONG t1, t2, t3, t4;
+
+ t1 = nrp[i + 0];
+ t2 = nrp[i + 1];
+ t3 = nrp[i + 2];
+ ap[i + 0] = 0;
+ t4 = nrp[i + 3];
+ ap[i + 1] = 0;
+ rp[i + 0] = t1;
+ ap[i + 2] = 0;
+ rp[i + 1] = t2;
+ ap[i + 3] = 0;
+ rp[i + 2] = t3;
+ rp[i + 3] = t4;
+ }
+ for (ri += 4; i < ri; i++)
+ rp[i] = nrp[i], ap[i] = 0;
+ bn_correct_top(r);
+ bn_correct_top(ret);
+# else
+ if (bn_wexpand(ret, al) == NULL)
+ goto err;
+ ret->top = al;
+ ret->neg = r->neg;
+
+ rp = ret->d;
+ ap = &(r->d[ri]);
+ al -= 4;
+ for (i = 0; i < al; i += 4) {
+ BN_ULONG t1, t2, t3, t4;
+
+ t1 = ap[i + 0];
+ t2 = ap[i + 1];
+ t3 = ap[i + 2];
+ t4 = ap[i + 3];
+ rp[i + 0] = t1;
+ rp[i + 1] = t2;
+ rp[i + 2] = t3;
+ rp[i + 3] = t4;
+ }
+ al += 4;
+ for (; i < al; i++)
+ rp[i] = ap[i];
+# endif
+# else /* !MONT_WORD */
+ BIGNUM *t1, *t2;
+
+ BN_CTX_start(ctx);
+ t1 = BN_CTX_get(ctx);
+ t2 = BN_CTX_get(ctx);
+ if (t1 == NULL || t2 == NULL)
+ goto err;
+
+ if (!BN_copy(t1, a))
+ goto err;
+ BN_mask_bits(t1, mont->ri);
+
+ if (!BN_mul(t2, t1, &mont->Ni, ctx))
+ goto err;
+ BN_mask_bits(t2, mont->ri);
+
+ if (!BN_mul(t1, t2, &mont->N, ctx))
+ goto err;
+ if (!BN_add(t2, a, t1))
+ goto err;
+ if (!BN_rshift(ret, t2, mont->ri))
+ goto err;
+# endif /* MONT_WORD */
+
+# if !defined(BRANCH_FREE) || BRANCH_FREE==0
+ if (BN_ucmp(ret, &(mont->N)) >= 0) {
+ if (!BN_usub(ret, ret, &(mont->N)))
+ goto err;
+ }
# endif
-#else /* !MONT_WORD */
- BIGNUM *t1,*t2;
-
- BN_CTX_start(ctx);
- t1 = BN_CTX_get(ctx);
- t2 = BN_CTX_get(ctx);
- if (t1 == NULL || t2 == NULL) goto err;
-
- if (!BN_copy(t1,a)) goto err;
- BN_mask_bits(t1,mont->ri);
-
- if (!BN_mul(t2,t1,&mont->Ni,ctx)) goto err;
- BN_mask_bits(t2,mont->ri);
-
- if (!BN_mul(t1,t2,&mont->N,ctx)) goto err;
- if (!BN_add(t2,a,t1)) goto err;
- if (!BN_rshift(ret,t2,mont->ri)) goto err;
-#endif /* MONT_WORD */
-
-#if !defined(BRANCH_FREE) || BRANCH_FREE==0
- if (BN_ucmp(ret, &(mont->N)) >= 0)
- {
- if (!BN_usub(ret,ret,&(mont->N))) goto err;
- }
-#endif
- retn=1;
- bn_check_top(ret);
+ retn = 1;
+ bn_check_top(ret);
err:
- BN_CTX_end(ctx);
- return(retn);
- }
-#endif /* MONT_FROM_WORD___NON_DEFAULT_0_9_8_BUILD */
+ BN_CTX_end(ctx);
+ return (retn);
+}
+#endif /* MONT_FROM_WORD___NON_DEFAULT_0_9_8_BUILD */
BN_MONT_CTX *BN_MONT_CTX_new(void)
- {
- BN_MONT_CTX *ret;
+{
+ BN_MONT_CTX *ret;
- if ((ret=(BN_MONT_CTX *)OPENSSL_malloc(sizeof(BN_MONT_CTX))) == NULL)
- return(NULL);
+ if ((ret = (BN_MONT_CTX *)OPENSSL_malloc(sizeof(BN_MONT_CTX))) == NULL)
+ return (NULL);
- BN_MONT_CTX_init(ret);
- ret->flags=BN_FLG_MALLOCED;
- return(ret);
- }
+ BN_MONT_CTX_init(ret);
+ ret->flags = BN_FLG_MALLOCED;
+ return (ret);
+}
void BN_MONT_CTX_init(BN_MONT_CTX *ctx)
- {
- ctx->ri=0;
- BN_init(&(ctx->RR));
- BN_init(&(ctx->N));
- BN_init(&(ctx->Ni));
-#if 0 /* for OpenSSL 0.9.9 mont->n0 */
- ctx->n0[0] = ctx->n0[1] = 0;
+{
+ ctx->ri = 0;
+ BN_init(&(ctx->RR));
+ BN_init(&(ctx->N));
+ BN_init(&(ctx->Ni));
+#if 0 /* for OpenSSL 0.9.9 mont->n0 */
+ ctx->n0[0] = ctx->n0[1] = 0;
#else
- ctx->n0 = 0;
+ ctx->n0 = 0;
#endif
- ctx->flags=0;
- }
+ ctx->flags = 0;
+}
void BN_MONT_CTX_free(BN_MONT_CTX *mont)
- {
- if(mont == NULL)
- return;
+{
+ if (mont == NULL)
+ return;
- BN_free(&(mont->RR));
- BN_free(&(mont->N));
- BN_free(&(mont->Ni));
- if (mont->flags & BN_FLG_MALLOCED)
- OPENSSL_free(mont);
- }
+ BN_free(&(mont->RR));
+ BN_free(&(mont->N));
+ BN_free(&(mont->Ni));
+ if (mont->flags & BN_FLG_MALLOCED)
+ OPENSSL_free(mont);
+}
int BN_MONT_CTX_set(BN_MONT_CTX *mont, const BIGNUM *mod, BN_CTX *ctx)
- {
- int ret = 0;
- BIGNUM *Ri,*R;
-
- BN_CTX_start(ctx);
- if((Ri = BN_CTX_get(ctx)) == NULL) goto err;
- R= &(mont->RR); /* grab RR as a temp */
- if (!BN_copy(&(mont->N),mod)) goto err; /* Set N */
- mont->N.neg = 0;
+{
+ int ret = 0;
+ BIGNUM *Ri, *R;
+
+ BN_CTX_start(ctx);
+ if ((Ri = BN_CTX_get(ctx)) == NULL)
+ goto err;
+ R = &(mont->RR); /* grab RR as a temp */
+ if (!BN_copy(&(mont->N), mod))
+ goto err; /* Set N */
+ mont->N.neg = 0;
#ifdef MONT_WORD
- {
- BIGNUM tmod;
- BN_ULONG buf[2];
-
- mont->ri=(BN_num_bits(mod)+(BN_BITS2-1))/BN_BITS2*BN_BITS2;
- BN_zero(R);
-#if 0 /* for OpenSSL 0.9.9 mont->n0, would be "#if defined(OPENSSL_BN_ASM_MONT) && (BN_BITS2<=32)",
- only certain BN_BITS2<=32 platforms actually need this */
- if (!(BN_set_bit(R,2*BN_BITS2))) goto err; /* R */
-#else
- if (!(BN_set_bit(R,BN_BITS2))) goto err; /* R */
-#endif
+ {
+ BIGNUM tmod;
+ BN_ULONG buf[2];
+
+ mont->ri = (BN_num_bits(mod) + (BN_BITS2 - 1)) / BN_BITS2 * BN_BITS2;
+ BN_zero(R);
+# if 0 /* for OpenSSL 0.9.9 mont->n0, would be "#if
+ * defined(OPENSSL_BN_ASM_MONT) &&
+ * (BN_BITS2<=32)", only certain BN_BITS2<=32
+ * platforms actually need this */
+ if (!(BN_set_bit(R, 2 * BN_BITS2)))
+ goto err; /* R */
+# else
+ if (!(BN_set_bit(R, BN_BITS2)))
+ goto err; /* R */
+# endif
- buf[0]=mod->d[0]; /* tmod = N mod word size */
- buf[1]=0;
-
- BN_init(&tmod);
- tmod.d=buf;
- tmod.top = buf[0] != 0 ? 1 : 0;
- tmod.dmax=2;
- tmod.neg=0;
-
-#if 0 /* for OpenSSL 0.9.9 mont->n0, would be "#if defined(OPENSSL_BN_ASM_MONT) && (BN_BITS2<=32)";
- only certain BN_BITS2<=32 platforms actually need this */
- tmod.top=0;
- if ((buf[0] = mod->d[0])) tmod.top=1;
- if ((buf[1] = mod->top>1 ? mod->d[1] : 0)) tmod.top=2;
-
- if ((BN_mod_inverse(Ri,R,&tmod,ctx)) == NULL)
- goto err;
- if (!BN_lshift(Ri,Ri,2*BN_BITS2)) goto err; /* R*Ri */
- if (!BN_is_zero(Ri))
- {
- if (!BN_sub_word(Ri,1)) goto err;
- }
- else /* if N mod word size == 1 */
- {
- if (bn_expand(Ri,(int)sizeof(BN_ULONG)*2) == NULL)
- goto err;
- /* Ri-- (mod double word size) */
- Ri->neg=0;
- Ri->d[0]=BN_MASK2;
- Ri->d[1]=BN_MASK2;
- Ri->top=2;
- }
- if (!BN_div(Ri,NULL,Ri,&tmod,ctx)) goto err;
- /* Ni = (R*Ri-1)/N,
- * keep only couple of least significant words: */
- mont->n0[0] = (Ri->top > 0) ? Ri->d[0] : 0;
- mont->n0[1] = (Ri->top > 1) ? Ri->d[1] : 0;
-#else
- /* Ri = R^-1 mod N*/
- if ((BN_mod_inverse(Ri,R,&tmod,ctx)) == NULL)
- goto err;
- if (!BN_lshift(Ri,Ri,BN_BITS2)) goto err; /* R*Ri */
- if (!BN_is_zero(Ri))
- {
- if (!BN_sub_word(Ri,1)) goto err;
- }
- else /* if N mod word size == 1 */
- {
- if (!BN_set_word(Ri,BN_MASK2)) goto err; /* Ri-- (mod word size) */
- }
- if (!BN_div(Ri,NULL,Ri,&tmod,ctx)) goto err;
- /* Ni = (R*Ri-1)/N,
- * keep only least significant word: */
-# if 0 /* for OpenSSL 0.9.9 mont->n0 */
- mont->n0[0] = (Ri->top > 0) ? Ri->d[0] : 0;
- mont->n0[1] = 0;
+ buf[0] = mod->d[0]; /* tmod = N mod word size */
+ buf[1] = 0;
+
+ BN_init(&tmod);
+ tmod.d = buf;
+ tmod.top = buf[0] != 0 ? 1 : 0;
+ tmod.dmax = 2;
+ tmod.neg = 0;
+
+# if 0 /* for OpenSSL 0.9.9 mont->n0, would be "#if
+ * defined(OPENSSL_BN_ASM_MONT) &&
+ * (BN_BITS2<=32)"; only certain BN_BITS2<=32
+ * platforms actually need this */
+ tmod.top = 0;
+ if ((buf[0] = mod->d[0]))
+ tmod.top = 1;
+ if ((buf[1] = mod->top > 1 ? mod->d[1] : 0))
+ tmod.top = 2;
+
+ if ((BN_mod_inverse(Ri, R, &tmod, ctx)) == NULL)
+ goto err;
+ if (!BN_lshift(Ri, Ri, 2 * BN_BITS2))
+ goto err; /* R*Ri */
+ if (!BN_is_zero(Ri)) {
+ if (!BN_sub_word(Ri, 1))
+ goto err;
+ } else { /* if N mod word size == 1 */
+
+ if (bn_expand(Ri, (int)sizeof(BN_ULONG) * 2) == NULL)
+ goto err;
+ /* Ri-- (mod double word size) */
+ Ri->neg = 0;
+ Ri->d[0] = BN_MASK2;
+ Ri->d[1] = BN_MASK2;
+ Ri->top = 2;
+ }
+ if (!BN_div(Ri, NULL, Ri, &tmod, ctx))
+ goto err;
+ /*
+ * Ni = (R*Ri-1)/N, keep only couple of least significant words:
+ */
+ mont->n0[0] = (Ri->top > 0) ? Ri->d[0] : 0;
+ mont->n0[1] = (Ri->top > 1) ? Ri->d[1] : 0;
# else
- mont->n0 = (Ri->top > 0) ? Ri->d[0] : 0;
+ /* Ri = R^-1 mod N */
+ if ((BN_mod_inverse(Ri, R, &tmod, ctx)) == NULL)
+ goto err;
+ if (!BN_lshift(Ri, Ri, BN_BITS2))
+ goto err; /* R*Ri */
+ if (!BN_is_zero(Ri)) {
+ if (!BN_sub_word(Ri, 1))
+ goto err;
+ } else { /* if N mod word size == 1 */
+
+ if (!BN_set_word(Ri, BN_MASK2))
+ goto err; /* Ri-- (mod word size) */
+ }
+ if (!BN_div(Ri, NULL, Ri, &tmod, ctx))
+ goto err;
+ /*
+ * Ni = (R*Ri-1)/N, keep only least significant word:
+ */
+# if 0 /* for OpenSSL 0.9.9 mont->n0 */
+ mont->n0[0] = (Ri->top > 0) ? Ri->d[0] : 0;
+ mont->n0[1] = 0;
+# else
+ mont->n0 = (Ri->top > 0) ? Ri->d[0] : 0;
+# endif
# endif
-#endif
- }
-#else /* !MONT_WORD */
- { /* bignum version */
- mont->ri=BN_num_bits(&mont->N);
- BN_zero(R);
- if (!BN_set_bit(R,mont->ri)) goto err; /* R = 2^ri */
- /* Ri = R^-1 mod N*/
- if ((BN_mod_inverse(Ri,R,&mont->N,ctx)) == NULL)
- goto err;
- if (!BN_lshift(Ri,Ri,mont->ri)) goto err; /* R*Ri */
- if (!BN_sub_word(Ri,1)) goto err;
- /* Ni = (R*Ri-1) / N */
- if (!BN_div(&(mont->Ni),NULL,Ri,&mont->N,ctx)) goto err;
- }
+ }
+#else /* !MONT_WORD */
+ { /* bignum version */
+ mont->ri = BN_num_bits(&mont->N);
+ BN_zero(R);
+ if (!BN_set_bit(R, mont->ri))
+ goto err; /* R = 2^ri */
+ /* Ri = R^-1 mod N */
+ if ((BN_mod_inverse(Ri, R, &mont->N, ctx)) == NULL)
+ goto err;
+ if (!BN_lshift(Ri, Ri, mont->ri))
+ goto err; /* R*Ri */
+ if (!BN_sub_word(Ri, 1))
+ goto err;
+ /*
+ * Ni = (R*Ri-1) / N
+ */
+ if (!BN_div(&(mont->Ni), NULL, Ri, &mont->N, ctx))
+ goto err;
+ }
#endif
- /* setup RR for conversions */
- BN_zero(&(mont->RR));
- if (!BN_set_bit(&(mont->RR),mont->ri*2)) goto err;
- if (!BN_mod(&(mont->RR),&(mont->RR),&(mont->N),ctx)) goto err;
+ /* setup RR for conversions */
+ BN_zero(&(mont->RR));
+ if (!BN_set_bit(&(mont->RR), mont->ri * 2))
+ goto err;
+ if (!BN_mod(&(mont->RR), &(mont->RR), &(mont->N), ctx))
+ goto err;
- ret = 1;
-err:
- BN_CTX_end(ctx);
- return ret;
- }
+ ret = 1;
+ err:
+ BN_CTX_end(ctx);
+ return ret;
+}
BN_MONT_CTX *BN_MONT_CTX_copy(BN_MONT_CTX *to, BN_MONT_CTX *from)
- {
- if (to == from) return(to);
-
- if (!BN_copy(&(to->RR),&(from->RR))) return NULL;
- if (!BN_copy(&(to->N),&(from->N))) return NULL;
- if (!BN_copy(&(to->Ni),&(from->Ni))) return NULL;
- to->ri=from->ri;
-#if 0 /* for OpenSSL 0.9.9 mont->n0 */
- to->n0[0]=from->n0[0];
- to->n0[1]=from->n0[1];
+{
+ if (to == from)
+ return (to);
+
+ if (!BN_copy(&(to->RR), &(from->RR)))
+ return NULL;
+ if (!BN_copy(&(to->N), &(from->N)))
+ return NULL;
+ if (!BN_copy(&(to->Ni), &(from->Ni)))
+ return NULL;
+ to->ri = from->ri;
+#if 0 /* for OpenSSL 0.9.9 mont->n0 */
+ to->n0[0] = from->n0[0];
+ to->n0[1] = from->n0[1];
#else
- to->n0=from->n0;
+ to->n0 = from->n0;
#endif
- return(to);
- }
+ return (to);
+}
BN_MONT_CTX *BN_MONT_CTX_set_locked(BN_MONT_CTX **pmont, int lock,
- const BIGNUM *mod, BN_CTX *ctx)
- {
- BN_MONT_CTX *ret;
-
- CRYPTO_r_lock(lock);
- ret = *pmont;
- CRYPTO_r_unlock(lock);
- if (ret)
- return ret;
-
- /* We don't want to serialise globally while doing our lazy-init math in
- * BN_MONT_CTX_set. That punishes threads that are doing independent
- * things. Instead, punish the case where more than one thread tries to
- * lazy-init the same 'pmont', by having each do the lazy-init math work
- * independently and only use the one from the thread that wins the race
- * (the losers throw away the work they've done). */
- ret = BN_MONT_CTX_new();
- if (!ret)
- return NULL;
- if (!BN_MONT_CTX_set(ret, mod, ctx))
- {
- BN_MONT_CTX_free(ret);
- return NULL;
- }
-
- /* The locked compare-and-set, after the local work is done. */
- CRYPTO_w_lock(lock);
- if (*pmont)
- {
- BN_MONT_CTX_free(ret);
- ret = *pmont;
- }
- else
- *pmont = ret;
- CRYPTO_w_unlock(lock);
- return ret;
- }
+ const BIGNUM *mod, BN_CTX *ctx)
+{
+ BN_MONT_CTX *ret;
+
+ CRYPTO_r_lock(lock);
+ ret = *pmont;
+ CRYPTO_r_unlock(lock);
+ if (ret)
+ return ret;
+
+ /*
+ * We don't want to serialise globally while doing our lazy-init math in
+ * BN_MONT_CTX_set. That punishes threads that are doing independent
+ * things. Instead, punish the case where more than one thread tries to
+ * lazy-init the same 'pmont', by having each do the lazy-init math work
+ * independently and only use the one from the thread that wins the race
+ * (the losers throw away the work they've done).
+ */
+ ret = BN_MONT_CTX_new();
+ if (!ret)
+ return NULL;
+ if (!BN_MONT_CTX_set(ret, mod, ctx)) {
+ BN_MONT_CTX_free(ret);
+ return NULL;
+ }
+
+ /* The locked compare-and-set, after the local work is done. */
+ CRYPTO_w_lock(lock);
+ if (*pmont) {
+ BN_MONT_CTX_free(ret);
+ ret = *pmont;
+ } else
+ *pmont = ret;
+ CRYPTO_w_unlock(lock);
+ return ret;
+}
projects / thirdparty / openssl.git / blobdiff