C++ BN_usub函数代码示例

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本文整理汇总了C++中BN_usub函数的典型用法代码示例。如果您正苦于以下问题：C++ BN_usub函数的具体用法？C++ BN_usub怎么用？C++ BN_usub使用的例子？那么恭喜您, 这里精选的函数代码示例或许可以为您提供帮助。

在下文中一共展示了BN_usub函数的20个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于我们的系统推荐出更棒的C++代码示例。

示例1: BN_add

int BN_add(BIGNUM *r, const BIGNUM *a, const BIGNUM *b) {
  const BIGNUM *tmp;
  int a_neg = a->neg, ret;

  //  a +  b	a+b
  //  a + -b	a-b
  // -a +  b	b-a
  // -a + -b	-(a+b)
  if (a_neg ^ b->neg) {
    // only one is negative
    if (a_neg) {
      tmp = a;
      a = b;
      b = tmp;
    }

    // we are now a - b
    if (BN_ucmp(a, b) < 0) {
      if (!BN_usub(r, b, a)) {
        return 0;
      }
      r->neg = 1;
    } else {
      if (!BN_usub(r, a, b)) {
        return 0;
      }
      r->neg = 0;
    }
    return 1;
  }

  ret = BN_uadd(r, a, b);
  r->neg = a_neg;
  return ret;
}

开发者ID:aaqib123，项目名称:angular_shoppingcart，代码行数:35，代码来源:add.c

示例2: BN_sub

int BN_sub(BIGNUM *r, const BIGNUM *a, const BIGNUM *b)
{
    int max;
    int add = 0, neg = 0;

    bn_check_top(a);
    bn_check_top(b);

    /*-
     *  a -  b      a-b
     *  a - -b      a+b
     * -a -  b      -(a+b)
     * -a - -b      b-a
     */
    if (a->neg) {
        if (b->neg) {
            const BIGNUM *tmp;

            tmp = a;
            a = b;
            b = tmp;
        } else {
            add = 1;
            neg = 1;
        }
    } else {
        if (b->neg) {
            add = 1;
            neg = 0;
        }
    }

    if (add) {
        if (!BN_uadd(r, a, b))
            return 0;
        r->neg = neg;
        return 1;
    }

    /* We are actually doing a - b :-) */

    max = (a->top > b->top) ? a->top : b->top;
    if (bn_wexpand(r, max) == NULL)
        return 0;
    if (BN_ucmp(a, b) < 0) {
        if (!BN_usub(r, b, a))
            return 0;
        r->neg = 1;
    } else {
        if (!BN_usub(r, a, b))
            return 0;
        r->neg = 0;
    }
    bn_check_top(r);
    return 1;
}

开发者ID:1234-，项目名称:openssl，代码行数:56，代码来源:bn_add.c

示例3: BN_div

int BN_div(BIGNUM *dv, BIGNUM *rem, const BIGNUM *m, const BIGNUM *d,
	   BN_CTX *ctx)
	{
	int i,nm,nd;
	int ret = 0;
	BIGNUM *D;

	bn_check_top(m);
	bn_check_top(d);
	if (BN_is_zero(d))
		{
		BNerr(BN_F_BN_DIV,BN_R_DIV_BY_ZERO);
		return(0);
		}

	if (BN_ucmp(m,d) < 0)
		{
		if (rem != NULL)
			{ if (BN_copy(rem,m) == NULL) return(0); }
		if (dv != NULL) BN_zero(dv);
		return(1);
		}

	BN_CTX_start(ctx);
	D = BN_CTX_get(ctx);
	if (dv == NULL) dv = BN_CTX_get(ctx);
	if (rem == NULL) rem = BN_CTX_get(ctx);
	if (D == NULL || dv == NULL || rem == NULL)
		goto end;

	nd=BN_num_bits(d);
	nm=BN_num_bits(m);
	if (BN_copy(D,d) == NULL) goto end;
	if (BN_copy(rem,m) == NULL) goto end;

	/* The next 2 are needed so we can do a dv->d[0]|=1 later
	 * since BN_lshift1 will only work once there is a value :-) */
	BN_zero(dv);
	if(bn_wexpand(dv,1) == NULL) goto end;
	dv->top=1;

	if (!BN_lshift(D,D,nm-nd)) goto end;
	for (i=nm-nd; i>=0; i--)
		{
		if (!BN_lshift1(dv,dv)) goto end;
		if (BN_ucmp(rem,D) >= 0)
			{
			dv->d[0]|=1;
			if (!BN_usub(rem,rem,D)) goto end;
			}
/* CAN IMPROVE (and have now :=) */
		if (!BN_rshift1(D,D)) goto end;
		}
	rem->neg=BN_is_zero(rem)?0:m->neg;
	dv->neg=m->neg^d->neg;
	ret = 1;
 end:
	BN_CTX_end(ctx);
	return(ret);
	}

开发者ID:EddieGarmon，项目名称:netduino-netmf，代码行数:60，代码来源:bn_div.cpp

示例4: BN_mod_add_quick

/* BN_mod_add variant that may be used if both  a  and  b  are non-negative
 * and less than  m */
int BN_mod_add_quick(BIGNUM *r, const BIGNUM *a, const BIGNUM *b, const BIGNUM *m)
	{
	if (!BN_uadd(r, a, b)) return 0;
	if (BN_ucmp(r, m) >= 0)
		return BN_usub(r, r, m);
	return 1;
	}

开发者ID:002301，项目名称:node，代码行数:9，代码来源:bn_mod.c

示例5: BN_sub

int BN_sub(BIGNUM *r, const BIGNUM *a, const BIGNUM *b) {
  int add = 0, neg = 0;
  const BIGNUM *tmp;

  //  a -  b	a-b
  //  a - -b	a+b
  // -a -  b	-(a+b)
  // -a - -b	b-a
  if (a->neg) {
    if (b->neg) {
      tmp = a;
      a = b;
      b = tmp;
    } else {
      add = 1;
      neg = 1;
    }
  } else {
    if (b->neg) {
      add = 1;
      neg = 0;
    }
  }

  if (add) {
    if (!BN_uadd(r, a, b)) {
      return 0;
    }

    r->neg = neg;
    return 1;
  }

  if (BN_ucmp(a, b) < 0) {
    if (!BN_usub(r, b, a)) {
      return 0;
    }
    r->neg = 1;
  } else {
    if (!BN_usub(r, a, b)) {
      return 0;
    }
    r->neg = 0;
  }

  return 1;
}

开发者ID:aaqib123，项目名称:angular_shoppingcart，代码行数:47，代码来源:add.c

示例6: ec_GFp_simple_invert

int ec_GFp_simple_invert(const EC_GROUP *group, EC_POINT *point, BN_CTX *ctx)
{
    if (EC_POINT_is_at_infinity(group, point) || BN_is_zero(point->Y))
        /* point is its own inverse */
        return 1;

    return BN_usub(point->Y, group->field, point->Y);
}

开发者ID:hitched97，项目名称:openssl，代码行数:8，代码来源:ecp_smpl.c

示例7: BN_add

/* r can == a or b */
int BN_add(BIGNUM *r, const BIGNUM *a, const BIGNUM *b)
{
    int a_neg = a->neg, ret;

    bn_check_top(a);
    bn_check_top(b);

    /*-
     *  a +  b      a+b
     *  a + -b      a-b
     * -a +  b      b-a
     * -a + -b      -(a+b)
     */
    if (a_neg ^ b->neg) {
        /* only one is negative */
        if (a_neg) {
            const BIGNUM *tmp;

            tmp = a;
            a = b;
            b = tmp;
        }

        /* we are now a - b */

        if (BN_ucmp(a, b) < 0) {
            if (!BN_usub(r, b, a))
                return 0;
            r->neg = 1;
        } else {
            if (!BN_usub(r, a, b))
                return 0;
            r->neg = 0;
        }
        return 1;
    }

    ret = BN_uadd(r, a, b);
    r->neg = a_neg;
    bn_check_top(r);
    return ret;
}

开发者ID:1234-，项目名称:openssl，代码行数:43，代码来源:bn_add.c

示例8: BN_add

/* r can == a or b */
int BN_add(BIGNUM *r, const BIGNUM *a, const BIGNUM *b)
	{
	const BIGNUM *tmp;

	bn_check_top(a);
	bn_check_top(b);

	/*  a +  b	a+b
	 *  a + -b	a-b
	 * -a +  b	b-a
	 * -a + -b	-(a+b)
	 */
	if (a->neg ^ b->neg)
		{
		/* only one is negative */
		if (a->neg)
			{ tmp=a; a=b; b=tmp; }

		/* we are now a - b */

		if (BN_ucmp(a,b) < 0)
			{
			if (!BN_usub(r,b,a)) return(0);
			r->neg=1;
			}
		else
			{
			if (!BN_usub(r,a,b)) return(0);
			r->neg=0;
			}
		return(1);
		}

	if (a->neg) /* both are neg */
		r->neg=1;
	else
		r->neg=0;

	if (!BN_uadd(r,a,b)) return(0);
	return(1);
	}

开发者ID:robacklin，项目名称:uclinux-linux，代码行数:42，代码来源:bn_add.c

示例9: fermat_question_ask

static RSA *
fermat_question_ask(const RSA *rsa)
{
  BIGNUM
    *a = BN_new(),
    *b = BN_new(),
    *a2 = BN_new(),
    *b2 = BN_new();
  BIGNUM *n = rsa->n;
  BIGNUM
    *tmp = BN_new(),
    *rem = BN_new(),
    *dssdelta = BN_new();
  BN_CTX *ctx = BN_CTX_new();
  RSA *ret = NULL;

  BN_sqrtmod(tmp, rem, n, ctx);
  /* Δ = |p - q| = |a + b - a + b| = |2b| > √N  2⁻¹⁰⁰ */
  /* BN_rshift(dssdelta, tmp, 101); */
  BN_one(dssdelta);
  BN_lshift(dssdelta, dssdelta, BN_num_bits(n) / 4 + 10);

  BN_copy(a, tmp);
  BN_sqr(a2, a, ctx);

  do {
    /* a² += 2a + 1 */
    BN_lshift1(tmp, a);
    BN_uiadd1(tmp);
    BN_add(a2, a2, tmp);
    /* a += 1 */
    BN_uiadd1(a);
    /* b² = a² - N */
    BN_usub(b2, a2, n);
    /* b */
    BN_sqrtmod(b, rem, b2, ctx);
  } while (!BN_is_zero(rem) && BN_cmp(b, dssdelta) < 1);

  if (BN_is_zero(rem)) {
    BN_uadd(a, a, b);
    ret = qa_RSA_recover(rsa, a, ctx);
  }

  BN_CTX_free(ctx);
  BN_free(a);
  BN_free(b);
  BN_free(a2);
  BN_free(b2);
  BN_free(dssdelta);
  BN_free(tmp);
  BN_free(rem);
  return ret;
}

开发者ID:fxfactorial，项目名称:bachelor，代码行数:53，代码来源:fermat.c

示例10: BN_from_montgomery

int BN_from_montgomery(BIGNUM *ret, const BIGNUM *a, BN_MONT_CTX *mont,
                       BN_CTX *ctx)
{
    int retn = 0;
#ifdef MONT_WORD
    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_correct_top(ret);
        bn_check_top(ret);
    }
    BN_CTX_end(ctx);
#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;

    if (BN_ucmp(ret, &(mont->N)) >= 0) {
        if (!BN_usub(ret, ret, &(mont->N)))
            goto err;
    }
    retn = 1;
    bn_check_top(ret);
 err:
    BN_CTX_end(ctx);
#endif                          /* MONT_WORD */
    return (retn);
}

开发者ID:AlexanderPankiv，项目名称:node，代码行数:49，代码来源:bn_mont.c

示例11: BN_nist_mod_224

int BN_nist_mod_224(BIGNUM *r, const BIGNUM *a, const BIGNUM *field,
	BN_CTX *ctx)
	{
#if BN_BITS2 != 64
	int	top = a->top, i;
	int	carry = 0;
	BN_ULONG *r_d, *a_d = a->d;
	BN_ULONG t_d[BN_NIST_224_TOP],
	         buf[BN_NIST_224_TOP];

	i = BN_ucmp(field, a);
	if (i == 0)
		{
		BN_zero(r);
		return 1;
		}
	else if (i > 0)
		return (r == a)? 1 : (BN_copy(r ,a) != NULL);

	if (top == BN_NIST_224_TOP)
		return BN_usub(r, a, field);

	if (r != a)
		{
		if (!bn_wexpand(r, BN_NIST_224_TOP))
			return 0;
		r_d = r->d;
		nist_cp_bn(r_d, a_d, BN_NIST_224_TOP);
		}
	else
		r_d = a_d;

	nist_cp_bn_0(buf, a_d + BN_NIST_224_TOP, top - BN_NIST_224_TOP, BN_NIST_224_TOP);

	nist_set_224(t_d, buf, 10, 9, 8, 7, 0, 0, 0);
	if (bn_add_words(r_d, r_d, t_d, BN_NIST_224_TOP))
		++carry;
	nist_set_224(t_d, buf, 0, 13, 12, 11, 0, 0, 0);
	if (bn_add_words(r_d, r_d, t_d, BN_NIST_224_TOP))
		++carry;
	nist_set_224(t_d, buf, 13, 12, 11, 10, 9, 8, 7);
	if (bn_sub_words(r_d, r_d, t_d, BN_NIST_224_TOP))
		--carry;
	nist_set_224(t_d, buf, 0, 0, 0, 0, 13, 12, 11);
	if (bn_sub_words(r_d, r_d, t_d, BN_NIST_224_TOP))
		--carry;

	if (carry > 0)
		while (carry)
			{
			if (bn_sub_words(r_d,r_d,_nist_p_224,BN_NIST_224_TOP))
				--carry;
			}
	else if (carry < 0)
		while (carry)
			{
			if (bn_add_words(r_d,r_d,_nist_p_224,BN_NIST_224_TOP))
				++carry;
			}

	r->top = BN_NIST_224_TOP;
	bn_correct_top(r);
	if (BN_ucmp(r, field) >= 0)
		{
		bn_sub_words(r_d, r_d, _nist_p_224, BN_NIST_224_TOP);
		bn_correct_top(r);
		}
	bn_check_top(r);
	return 1;
#else
	return 0;
#endif
	}

开发者ID:hackshields，项目名称:antivirus，代码行数:73，代码来源:bn_nist.c

示例12: ec_GFp_simple_set_compressed_coordinates


//.........这里部分代码省略.........
        !group->meth->field_mul(group, tmp1, tmp2, x_, ctx)) {
      goto err;
    }
  } else {
    if (!BN_mod_sqr(tmp2, x_, &group->field, ctx) ||
        !BN_mod_mul(tmp1, tmp2, x_, &group->field, ctx)) {
      goto err;
    }
  }

  /* tmp1 := tmp1 + a*x */
  if (group->a_is_minus3) {
    if (!BN_mod_lshift1_quick(tmp2, x, &group->field) ||
        !BN_mod_add_quick(tmp2, tmp2, x, &group->field) ||
        !BN_mod_sub_quick(tmp1, tmp1, tmp2, &group->field)) {
      goto err;
    }
  } else {
    if (group->meth->field_decode) {
      if (!group->meth->field_decode(group, tmp2, &group->a, ctx) ||
          !BN_mod_mul(tmp2, tmp2, x, &group->field, ctx)) {
        goto err;
      }
    } else {
      /* field_mul works on standard representation */
      if (!group->meth->field_mul(group, tmp2, &group->a, x, ctx)) {
        goto err;
      }
    }

    if (!BN_mod_add_quick(tmp1, tmp1, tmp2, &group->field)) {
      goto err;
    }
  }

  /* tmp1 := tmp1 + b */
  if (group->meth->field_decode) {
    if (!group->meth->field_decode(group, tmp2, &group->b, ctx) ||
        !BN_mod_add_quick(tmp1, tmp1, tmp2, &group->field)) {
      goto err;
    }
  } else {
    if (!BN_mod_add_quick(tmp1, tmp1, &group->b, &group->field)) {
      goto err;
    }
  }

  if (!BN_mod_sqrt(y, tmp1, &group->field, ctx)) {
    unsigned long err = ERR_peek_last_error();

    if (ERR_GET_LIB(err) == ERR_LIB_BN &&
        ERR_GET_REASON(err) == BN_R_NOT_A_SQUARE) {
      ERR_clear_error();
      OPENSSL_PUT_ERROR(EC, ec_GFp_simple_set_compressed_coordinates, EC_R_INVALID_COMPRESSED_POINT);
    } else {
      OPENSSL_PUT_ERROR(EC, ec_GFp_simple_set_compressed_coordinates, ERR_R_BN_LIB);
    }
    goto err;
  }

  if (y_bit != BN_is_odd(y)) {
    if (BN_is_zero(y)) {
      int kron;

      kron = BN_kronecker(x, &group->field, ctx);
      if (kron == -2) {
        goto err;
      }

      if (kron == 1) {
        OPENSSL_PUT_ERROR(EC, ec_GFp_simple_set_compressed_coordinates,
                          EC_R_INVALID_COMPRESSION_BIT);
      } else {
        /* BN_mod_sqrt() should have cought this error (not a square) */
        OPENSSL_PUT_ERROR(EC, ec_GFp_simple_set_compressed_coordinates,
                          EC_R_INVALID_COMPRESSED_POINT);
      }
      goto err;
    }
    if (!BN_usub(y, &group->field, y)) {
      goto err;
    }
  }
  if (y_bit != BN_is_odd(y)) {
    OPENSSL_PUT_ERROR(EC, ec_GFp_simple_set_compressed_coordinates,
                      ERR_R_INTERNAL_ERROR);
    goto err;
  }

  if (!EC_POINT_set_affine_coordinates_GFp(group, point, x, y, ctx))
    goto err;

  ret = 1;

err:
  BN_CTX_end(ctx);
  if (new_ctx != NULL)
    BN_CTX_free(new_ctx);
  return ret;
}

开发者ID:ZzeetteEZzOLARINventionZ，项目名称:libwebrtc，代码行数:101，代码来源:oct.c

示例13: BN_mod_inverse_no_branch


//.........这里部分代码省略.........
				{
				shift++;
				
				if (BN_is_odd(Y))
					{
					if (!BN_uadd(Y, Y, n)) goto err;
					}
				/* now Y is even */
				if (!BN_rshift1(Y, Y)) goto err;
				}
			if (shift > 0)
				{
				if (!BN_rshift(A, A, shift)) goto err;
				}

			
			/* We still have (1) and (2).
			 * Both  A  and  B  are odd.
			 * The following computations ensure that
			 *
			 *     0 <= B < |n|,
			 *      0 < A < |n|,
			 * (1) -sign*X*a  ==  B   (mod |n|),
			 * (2)  sign*Y*a  ==  A   (mod |n|),
			 *
			 * and that either  A  or  B  is even in the next iteration.
			 */
			if (BN_ucmp(B, A) >= 0)
				{
				/* -sign*(X + Y)*a == B - A  (mod |n|) */
				if (!BN_uadd(X, X, Y)) goto err;
				/* NB: we could use BN_mod_add_quick(X, X, Y, n), but that
				 * actually makes the algorithm slower */
				if (!BN_usub(B, B, A)) goto err;
				}
			else
				{
				/*  sign*(X + Y)*a == A - B  (mod |n|) */
				if (!BN_uadd(Y, Y, X)) goto err;
				/* as above, BN_mod_add_quick(Y, Y, X, n) would slow things down */
				if (!BN_usub(A, A, B)) goto err;
				}
			}
		}
	else
		{
		/* general inversion algorithm */

		while (!BN_is_zero(B))
			{
			BIGNUM *tmp;
			
			/*
			 *      0 < B < A,
			 * (*) -sign*X*a  ==  B   (mod |n|),
			 *      sign*Y*a  ==  A   (mod |n|)
			 */
			
			/* (D, M) := (A/B, A%B) ... */
			if (BN_num_bits(A) == BN_num_bits(B))
				{
				if (!BN_one(D)) goto err;
				if (!BN_sub(M,A,B)) goto err;
				}
			else if (BN_num_bits(A) == BN_num_bits(B) + 1)
				{

开发者ID:RyunosukeOno，项目名称:rayjack，代码行数:67，代码来源:bn_gcd.c

示例14: BN_from_montgomery


//.........这里部分代码省略.........
	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
	retn=1;
	bn_check_top(ret);
 err:
	BN_CTX_end(ctx);
	return(retn);
	}

开发者ID:siredblood，项目名称:tree-bumpkin-project，代码行数:101，代码来源:bn_mont.c

示例15: BN_div_recp

int BN_div_recp(BIGNUM *dv, BIGNUM *rem, const BIGNUM *m,
                BN_RECP_CTX *recp, BN_CTX *ctx)
{
    int i, j, ret = 0;
    BIGNUM *a, *b, *d, *r;

    BN_CTX_start(ctx);
    d = (dv != NULL) ? dv : BN_CTX_get(ctx);
    r = (rem != NULL) ? rem : BN_CTX_get(ctx);
    a = BN_CTX_get(ctx);
    b = BN_CTX_get(ctx);
    if (b == NULL)
        goto err;

    if (BN_ucmp(m, &(recp->N)) < 0) {
        BN_zero(d);
        if (!BN_copy(r, m)) {
            BN_CTX_end(ctx);
            return 0;
        }
        BN_CTX_end(ctx);
        return 1;
    }

    /*
     * We want the remainder Given input of ABCDEF / ab we need multiply
     * ABCDEF by 3 digests of the reciprocal of ab
     */

    /* i := max(BN_num_bits(m), 2*BN_num_bits(N)) */
    i = BN_num_bits(m);
    j = recp->num_bits << 1;
    if (j > i)
        i = j;

    /* Nr := round(2^i / N) */
    if (i != recp->shift)
        recp->shift = BN_reciprocal(&(recp->Nr), &(recp->N), i, ctx);
    /* BN_reciprocal could have returned -1 for an error */
    if (recp->shift == -1)
        goto err;

    /*-
     * d := |round(round(m / 2^BN_num_bits(N)) * recp->Nr / 2^(i - BN_num_bits(N)))|
     *    = |round(round(m / 2^BN_num_bits(N)) * round(2^i / N) / 2^(i - BN_num_bits(N)))|
     *   <= |(m / 2^BN_num_bits(N)) * (2^i / N) * (2^BN_num_bits(N) / 2^i)|
     *    = |m/N|
     */
    if (!BN_rshift(a, m, recp->num_bits))
        goto err;
    if (!BN_mul(b, a, &(recp->Nr), ctx))
        goto err;
    if (!BN_rshift(d, b, i - recp->num_bits))
        goto err;
    d->neg = 0;

    if (!BN_mul(b, &(recp->N), d, ctx))
        goto err;
    if (!BN_usub(r, m, b))
        goto err;
    r->neg = 0;

    j = 0;
    while (BN_ucmp(r, &(recp->N)) >= 0) {
        if (j++ > 2) {
            BNerr(BN_F_BN_DIV_RECP, BN_R_BAD_RECIPROCAL);
            goto err;
        }
        if (!BN_usub(r, r, &(recp->N)))
            goto err;
        if (!BN_add_word(d, 1))
            goto err;
    }

    r->neg = BN_is_zero(r) ? 0 : m->neg;
    d->neg = m->neg ^ recp->N.neg;
    ret = 1;
 err:
    BN_CTX_end(ctx);
    bn_check_top(dv);
    bn_check_top(rem);
    return ret;
}

开发者ID:isaracorp，项目名称:openssl，代码行数:83，代码来源:bn_recp.c

示例16: BN_from_montgomery


//.........这里部分代码省略.........
#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_fix_top(r);
	
	/* mont->ri will be a multiple of the word size */
#if 0
	BN_rshift(ret,r,mont->ri);
#else
	ret->neg = r->neg;
	x=ri;
	rp=ret->d;
	ap= &(r->d[x]);
	if (r->top < x)
		al=0;
	else
		al=r->top-x;
	ret->top=al;
	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 (BN_ucmp(ret, &(mont->N)) >= 0)
		{
		if (!BN_usub(ret,ret,&(mont->N))) goto err;
		}
	retn=1;
 err:
	BN_CTX_end(ctx);
	return(retn);
	}

开发者ID:niubl，项目名称:camera_project，代码行数:101，代码来源:bn_mont.c

示例17: BN_div

int BN_div(BIGNUM *dv, BIGNUM *rm, const BIGNUM *num, const BIGNUM *divisor,
		   BN_CTX *ctx)
{
	int norm_shift, i, j, loop;
	BIGNUM *tmp, wnum, *snum, *sdiv, *res;
	BN_ULONG *resp, *wnump;
	BN_ULONG d0, d1;
	int num_n, div_n;

	bn_check_top(num);
	bn_check_top(divisor);

	if(BN_is_zero(divisor))
	{
		return (0);
	}

	if(BN_ucmp(num, divisor) < 0)
	{
		if(rm != NULL)
		{
			if(BN_copy(rm, num) == NULL) { return (0); }
		}
		if(dv != NULL) { BN_zero(dv); }
		return (1);
	}

	BN_CTX_start(ctx);
	tmp = BN_CTX_get(ctx);
	snum = BN_CTX_get(ctx);
	sdiv = BN_CTX_get(ctx);
	if(dv == NULL)
		{ res = BN_CTX_get(ctx); }
	else    { res = dv; }
	if(sdiv == NULL || res == NULL) { goto err; }
	tmp->neg = 0;

	/* First we normalise the numbers */
	norm_shift = BN_BITS2 - ((BN_num_bits(divisor)) % BN_BITS2);
	BN_lshift(sdiv, divisor, norm_shift);
	sdiv->neg = 0;
	norm_shift += BN_BITS2;
	BN_lshift(snum, num, norm_shift);
	snum->neg = 0;
	div_n = sdiv->top;
	num_n = snum->top;
	loop = num_n - div_n;

	/* Lets setup a 'window' into snum
	 * This is the part that corresponds to the current
	 * 'area' being divided */
	BN_init(&wnum);
	wnum.d =  &(snum->d[loop]);
	wnum.top = div_n;
	wnum.dmax = snum->dmax + 1; /* a bit of a lie */

	/* Get the top 2 words of sdiv */
	/* i=sdiv->top; */
	d0 = sdiv->d[div_n - 1];
	d1 = (div_n == 1) ? 0 : sdiv->d[div_n - 2];

	/* pointer to the 'top' of snum */
	wnump = &(snum->d[num_n - 1]);

	/* Setup to 'res' */
	res->neg = (num->neg ^ divisor->neg);
	if(!bn_wexpand(res, (loop + 1))) { goto err; }
	res->top = loop;
	resp = &(res->d[loop - 1]);

	/* space for temp */
	if(!bn_wexpand(tmp, (div_n + 1))) { goto err; }

	if(BN_ucmp(&wnum, sdiv) >= 0)
	{
		if(!BN_usub(&wnum, &wnum, sdiv)) { goto err; }
		*resp = 1;
		res->d[res->top - 1] = 1;
	}
	else
		{ res->top--; }
	resp--;

	for(i = 0; i < loop - 1; i++)
	{
		BN_ULONG q, l0;
#if defined(BN_DIV3W) && !defined(NO_ASM)
		BN_ULONG bn_div_3_words(BN_ULONG *, BN_ULONG, BN_ULONG);
		q = bn_div_3_words(wnump, d1, d0);
#else
		BN_ULONG n0, n1, rem = 0;

		n0 = wnump[0];
		n1 = wnump[-1];
		if(n0 == d0)
			{ q = BN_MASK2; }
		else            /* n0 < d0 */
		{
#ifdef BN_LLONG
			BN_ULLONG t2;
//.........这里部分代码省略.........

开发者ID:FFTEAM，项目名称:oscam，代码行数:101，代码来源:bn_div.c

示例18: BN_div_recp

int BN_div_recp(BIGNUM *dv, BIGNUM *rem, BIGNUM *m, BN_RECP_CTX *recp,
	     BN_CTX *ctx)
	{
	int i,j,ret=0;
	BIGNUM *a,*b,*d,*r;

	BN_CTX_start(ctx);
	a=BN_CTX_get(ctx);
	b=BN_CTX_get(ctx);
	if (dv != NULL)
		d=dv;
	else
		d=BN_CTX_get(ctx);
	if (rem != NULL)
		r=rem;
	else
		r=BN_CTX_get(ctx);
	if (a == NULL || b == NULL || d == NULL || r == NULL) goto err;

	if (BN_ucmp(m,&(recp->N)) < 0)
		{
		BN_zero(d);
		BN_copy(r,m);
		BN_CTX_end(ctx);
		return(1);
		}

	/* We want the remainder
	 * Given input of ABCDEF / ab
	 * we need multiply ABCDEF by 3 digests of the reciprocal of ab
	 *
	 */
	i=BN_num_bits(m);

	j=recp->num_bits<<1;
	if (j>i) i=j;
	j>>=1;

	if (i != recp->shift)
		recp->shift=BN_reciprocal(&(recp->Nr),&(recp->N),
			i,ctx);

	if (!BN_rshift(a,m,j)) goto err;
	if (!BN_mul(b,a,&(recp->Nr),ctx)) goto err;
	if (!BN_rshift(d,b,i-j)) goto err;
	d->neg=0;
	if (!BN_mul(b,&(recp->N),d,ctx)) goto err;
	if (!BN_usub(r,m,b)) goto err;
	r->neg=0;

#if 1
	j=0;
	while (BN_ucmp(r,&(recp->N)) >= 0)
		{
		if (j++ > 2)
			goto err;
		if (!BN_usub(r,r,&(recp->N))) goto err;
		if (!BN_add_word(d,1)) goto err;
		}
#endif

	r->neg=BN_is_zero(r)?0:m->neg;
	d->neg=m->neg^recp->N.neg;
	ret=1;
err:
	BN_CTX_end(ctx);
	return(ret);
	}

开发者ID:robacklin，项目名称:uclinux-linux，代码行数:68，代码来源:bn_recp.c

示例19: BN_nist_mod_384

int BN_nist_mod_384(BIGNUM *r, const BIGNUM *a, const BIGNUM *field,
	BN_CTX *ctx)
	{
#if BN_BITS2 != 64
	int	i, top = a->top;
	int	carry = 0;
	register BN_ULONG *r_d, *a_d = a->d;
	BN_ULONG t_d[BN_NIST_384_TOP],
	         buf[BN_NIST_384_TOP];

	if (!_is_set_384_data)
		{
		CRYPTO_w_lock(CRYPTO_LOCK_BN);
		
		if (!_is_set_384_data)
			_init_384_data();

		CRYPTO_w_unlock(CRYPTO_LOCK_BN);
		}

	i = BN_ucmp(field, a);
	if (i == 0)
		{
		BN_zero(r);
		return 1;
		}
	else if (i > 0)
		return (r == a)? 1 : (BN_copy(r ,a) != NULL);

	if (top == BN_NIST_384_TOP)
		return BN_usub(r, a, field);

	if (r != a)
		{
		if (!bn_wexpand(r, BN_NIST_384_TOP))
			return 0;
		r_d = r->d;
		nist_cp_bn(r_d, a_d, BN_NIST_384_TOP);
		}
	else
		r_d = a_d;

	nist_cp_bn_0(buf, a_d + BN_NIST_384_TOP, top - BN_NIST_384_TOP, BN_NIST_384_TOP);

	/*S1*/
	nist_set_256(t_d, buf, 0, 0, 0, 0, 0, 23-4, 22-4, 21-4);
		/* left shift */
		{
		register BN_ULONG *ap,t,c;
		ap = t_d;
		c=0;
		for (i = BN_NIST_256_TOP; i != 0; --i)
			{
			t= *ap;
			*(ap++)=((t<<1)|c)&BN_MASK2;
			c=(t & BN_TBIT)?1:0;
			}
		}
	if (bn_add_words(r_d+(128/BN_BITS2), r_d+(128/BN_BITS2), 
		t_d, BN_NIST_256_TOP))
		++carry;
	/*S2 */
	if (bn_add_words(r_d, r_d, buf, BN_NIST_384_TOP))
		++carry;
	/*S3*/
	nist_set_384(t_d,buf,20,19,18,17,16,15,14,13,12,23,22,21);
	if (bn_add_words(r_d, r_d, t_d, BN_NIST_384_TOP))
		++carry;
	/*S4*/
	nist_set_384(t_d,buf,19,18,17,16,15,14,13,12,20,0,23,0);
	if (bn_add_words(r_d, r_d, t_d, BN_NIST_384_TOP))
		++carry;
	/*S5*/
	nist_set_256(t_d, buf, 0, 0, 0, 0, 23-4, 22-4, 21-4, 20-4);
	if (bn_add_words(r_d+(128/BN_BITS2), r_d+(128/BN_BITS2), 
		t_d, BN_NIST_256_TOP))
		++carry;
	/*S6*/
	nist_set_384(t_d,buf,0,0,0,0,0,0,23,22,21,0,0,20);
	if (bn_add_words(r_d, r_d, t_d, BN_NIST_384_TOP))
		++carry;
	/*D1*/
	nist_set_384(t_d,buf,22,21,20,19,18,17,16,15,14,13,12,23);
	if (bn_sub_words(r_d, r_d, t_d, BN_NIST_384_TOP))
		--carry;
	/*D2*/
	nist_set_384(t_d,buf,0,0,0,0,0,0,0,23,22,21,20,0);
	if (bn_sub_words(r_d, r_d, t_d, BN_NIST_384_TOP))
		--carry;
	/*D3*/
	nist_set_384(t_d,buf,0,0,0,0,0,0,0,23,23,0,0,0);
	if (bn_sub_words(r_d, r_d, t_d, BN_NIST_384_TOP))
		--carry;
	
	if (carry)
		{
		if (carry > 0)
			bn_sub_words(r_d, r_d, _384_data + BN_NIST_384_TOP *
				--carry, BN_NIST_384_TOP);
		else
//.........这里部分代码省略.........

开发者ID:hackshields，项目名称:antivirus，代码行数:101，代码来源:bn_nist.c

示例20: BN_div_recp

int BN_div_recp(BIGNUM *dv, BIGNUM *rem, const BIGNUM *m,
	BN_RECP_CTX *recp, BN_CTX *ctx)
	{
	int i,j,ret=0;
	BIGNUM *a,*b,*d,*r;

	BN_CTX_start(ctx);
	a=BN_CTX_get(ctx);
	b=BN_CTX_get(ctx);
	if (dv != NULL)
		d=dv;
	else
		d=BN_CTX_get(ctx);
	if (rem != NULL)
		r=rem;
	else
		r=BN_CTX_get(ctx);
	if (a == NULL || b == NULL || d == NULL || r == NULL) goto err;

	if (BN_ucmp(m,&(recp->N)) < 0)
		{
		if (!BN_zero(d)) return 0;
		if (!BN_copy(r,m)) return 0;
		BN_CTX_end(ctx);
		return(1);
		}

	/* We want the remainder
	 * Given input of ABCDEF / ab
	 * we need multiply ABCDEF by 3 digests of the reciprocal of ab
	 *
	 */

	/* i := max(BN_num_bits(m), 2*BN_num_bits(N)) */
	i=BN_num_bits(m);
	j=recp->num_bits<<1;
	if (j>i) i=j;

	/* Nr := round(2^i / N) */
	if (i != recp->shift)
		recp->shift=BN_reciprocal(&(recp->Nr),&(recp->N),
			i,ctx); /* BN_reciprocal returns i, or -1 for an error */
	if (recp->shift == -1) goto err;

	/* d := |round(round(m / 2^BN_num_bits(N)) * recp->Nr / 2^(i - BN_num_bits(N)))|
	 *    = |round(round(m / 2^BN_num_bits(N)) * round(2^i / N) / 2^(i - BN_num_bits(N)))|
	 *   <= |(m / 2^BN_num_bits(N)) * (2^i / N) * (2^BN_num_bits(N) / 2^i)|
	 *    = |m/N|
	 */
	if (!BN_rshift(a,m,recp->num_bits)) goto err;
	if (!BN_mul(b,a,&(recp->Nr),ctx)) goto err;
	if (!BN_rshift(d,b,i-recp->num_bits)) goto err;
	d->neg=0;

	if (!BN_mul(b,&(recp->N),d,ctx)) goto err;
	if (!BN_usub(r,m,b)) goto err;
	r->neg=0;

#if 1
	j=0;
	while (BN_ucmp(r,&(recp->N)) >= 0)
		{
		if (j++ > 2)
			{
			BNerr(BN_F_BN_MOD_MUL_RECIPROCAL,BN_R_BAD_RECIPROCAL);
			goto err;
			}
		if (!BN_usub(r,r,&(recp->N))) goto err;
		if (!BN_add_word(d,1)) goto err;
		}
#endif

	r->neg=BN_is_zero(r)?0:m->neg;
	d->neg=m->neg^recp->N.neg;
	ret=1;
err:
	BN_CTX_end(ctx);
	return(ret);
	}

开发者ID:12019，项目名称:svn.gov.pt，代码行数:79，代码来源:bn_recp.c

注：本文中的BN_usub函数示例整理自Github/MSDocs等源码及文档管理平台，相关代码片段筛选自各路编程大神贡献的开源项目，源码版权归原作者所有，传播和使用请参考对应项目的License；未经允许，请勿转载。

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C++ BN_usub函数代码示例

示例1: BN_add

示例2: BN_sub

示例3: BN_div

示例4: BN_mod_add_quick

示例5: BN_sub

示例6: ec_GFp_simple_invert

示例7: BN_add

示例8: BN_add

示例9: fermat_question_ask

示例10: BN_from_montgomery

示例11: BN_nist_mod_224

示例12: ec_GFp_simple_set_compressed_coordinates

示例13: BN_mod_inverse_no_branch

示例14: BN_from_montgomery

示例15: BN_div_recp

示例16: BN_from_montgomery

示例17: BN_div

示例18: BN_div_recp

示例19: BN_nist_mod_384

示例20: BN_div_recp

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