docs/dbig.md

<a name="DBIG"></a>

## DBIG
**Kind**: global class  
**this**: <code>{DBIG}</code>  

* [DBIG](#DBIG)
    * [new DBIG()](#new_DBIG_new)
    * _instance_
        * [.zero()](#DBIG+zero) ⇒
        * [.copy()](#DBIG+copy) ⇒
        * [.hcopy()](#DBIG+hcopy) ⇒
        * [.norm()](#DBIG+norm) ⇒
        * [.muladd()](#DBIG+muladd)
        * [.shr()](#DBIG+shr) ⇒
        * [.shl()](#DBIG+shl) ⇒
        * [.cmove()](#DBIG+cmove)
        * [.add()](#DBIG+add) ⇒
        * [.sub()](#DBIG+sub) ⇒
        * [.nbits()](#DBIG+nbits) ⇒
        * [.toString()](#DBIG+toString) ⇒
        * [.mod()](#DBIG+mod) ⇒
        * [.div()](#DBIG+div) ⇒
        * [.split()](#DBIG+split) ⇒
    * _static_
        * [.comp()](#DBIG.comp) ⇒

<a name="new_DBIG_new"></a>

### new DBIG()
General purpose Constructor

<a name="DBIG+zero"></a>

### dbiG.zero() ⇒
set to zero

**Kind**: instance method of [<code>DBIG</code>](#DBIG)  
**Returns**: BIG number  
**this**: <code>{DBIG}</code>  
<a name="DBIG+copy"></a>

### dbiG.copy() ⇒
set to b

**Kind**: instance method of [<code>DBIG</code>](#DBIG)  
**Returns**: DBIG number  
**this**: <code>{DBIG}</code>  
**Parameter**: b DBIG number  
<a name="DBIG+hcopy"></a>

### dbiG.hcopy() ⇒
copy from ctx.BIG

**Kind**: instance method of [<code>DBIG</code>](#DBIG)  
**Returns**: DBIG number  
**this**: <code>{DBIG}</code>  
**Parameter**: b BIG number  
<a name="DBIG+norm"></a>

### dbiG.norm() ⇒
normalise DBIG - force all digits < 2^BASEBITS

**Kind**: instance method of [<code>DBIG</code>](#DBIG)  
**Returns**: DBIG number  
**this**: <code>{DBIG}</code>  
<a name="DBIG+muladd"></a>

### dbiG.muladd()
this[i]+=x*y+c, and return high part

**Kind**: instance method of [<code>DBIG</code>](#DBIG)  
**this**: <code>{DBIG}</code>  
<a name="DBIG+shr"></a>

### dbiG.shr() ⇒
General shift right by k bits

**Kind**: instance method of [<code>DBIG</code>](#DBIG)  
**Returns**: BIG number  
**this**: <code>{DBIG}</code>  
**Parameter**: k Number of bits to shift  
<a name="DBIG+shl"></a>

### dbiG.shl() ⇒
General shift left by k bits

**Kind**: instance method of [<code>DBIG</code>](#DBIG)  
**Returns**: BIG number  
**this**: <code>{BIG}</code>  
**Parameter**: k Number of bits to shift  
<a name="DBIG+cmove"></a>

### dbiG.cmove()
Conditional move of BIG depending on d using XOR - no branches

**Kind**: instance method of [<code>DBIG</code>](#DBIG)  
**this**: <code>{DBIG}</code>  
**Parameter**: b DBIG number  
**Parameter**: d DBIG number  
<a name="DBIG+add"></a>

### dbiG.add() ⇒
Sum two DBIG mumbers

**Kind**: instance method of [<code>DBIG</code>](#DBIG)  
**Returns**: this+=x  
**this**: <code>{DBIG}</code>  
**Parameter**: x DBIG object  
<a name="DBIG+sub"></a>

### dbiG.sub() ⇒
Subtract DBIG from one another

**Kind**: instance method of [<code>DBIG</code>](#DBIG)  
**Returns**: this-=x  
**this**: <code>{DBIG}</code>  
**Parameter**: x BIG object  
<a name="DBIG+nbits"></a>

### dbiG.nbits() ⇒
length in bits

**Kind**: instance method of [<code>DBIG</code>](#DBIG)  
**Returns**: The number of bigs in DBIG object  
**this**: <code>{DBIG}</code>  
<a name="DBIG+toString"></a>

### dbiG.toString() ⇒
Convert to string

**Kind**: instance method of [<code>DBIG</code>](#DBIG)  
**Returns**: string representation of a BIG number  
**this**: <code>{DBIG}</code>  
<a name="DBIG+mod"></a>

### dbiG.mod() ⇒
reduces this DBIG mod a ctx.BIG, and returns the ctx.BIG

**Kind**: instance method of [<code>DBIG</code>](#DBIG)  
**Returns**: BIG object  
**this**: <code>{DBIG}</code>  
<a name="DBIG+div"></a>

### dbiG.div() ⇒
this/=c

**Kind**: instance method of [<code>DBIG</code>](#DBIG)  
**Returns**: DBIG number  
**this**: <code>{DBIG}</code>  
**Paramter**: c divisor  
<a name="DBIG+split"></a>

### dbiG.split() ⇒
split this DBIG at position n, return higher half, keep lower half

**Kind**: instance method of [<code>DBIG</code>](#DBIG)  
**Returns**: lower half BIG number  
**this**: <code>{DBIG}</code>  
**Paramter**: n Position to splitdivisor  
<a name="DBIG.comp"></a>

### DBIG.comp() ⇒
Compare a and b

**Kind**: static method of [<code>DBIG</code>](#DBIG)  
**Returns**: 0 if a==b, -1 if a<b, +1 if a>b  
**this**: <code>{DBIG}</code>  
**Parameter**: a DBIG number (normalised)  
**Parameter**: b DBIG number (normalised