logo
down
shadow

C# Biginteger for huge number of bits


C# Biginteger for huge number of bits

By : Sam
Date : November 21 2020, 09:01 AM
should help you out I would like to know if there is any efficient way to store a big number using C#. I would like to create number consisting of 960 bytes but BigInteger can't hold it. I would be grateful for any advice.
code :
static void Main(string[] args)
{
    var arr = new byte[960];

    for (int i = 0; i != arr.Length; i++)
    {
        arr[i] = byte.MaxValue;
    }

    var big = new BigInteger(arr);
}
var arr = new byte[961];
arr[arr.Length-1] = 0;
var big2 = new BigInteger(arr);


Share : facebook icon twitter icon
How to break the 2048bit BigInteger into words with a fixed number of 64 bits?

How to break the 2048bit BigInteger into words with a fixed number of 64 bits?


By : Alex Petrov
Date : March 29 2020, 07:55 AM
will be helpful for those in need I have a key that contain 2048 bit BigInteger number. I want to break it into words with a fixed number of 64 bits, and then computes the exclusive OR of all those words; does anyone can help me to implement this by java? this is my method that must be implemented:
code :
LongBuffer buffer = ByteBuffer.wrap(myBigInteger.toByteArray()).asLongBuffer();
long xor = 0;
while (buffer.hasRemaining()) {
  xor ^= buffer.get();
}
return BigInteger.valueOf(xor);
How to split the 2048 bits BigInteger into words with a fixed number of 64 bits?

How to split the 2048 bits BigInteger into words with a fixed number of 64 bits?


By : Klawd Kompyuter
Date : March 29 2020, 07:55 AM
this will help If you want to use only BigIntegers in your method (instead of long), you can do it like that:
code :
public static BigInteger parityWordChecksum(final BigInteger key) {
    BigInteger result = new BigInteger("0");

    BigInteger mask = BigInteger.ZERO;
    for (int i = 0; i < 64; i++) {
        mask = mask.setBit(i);
    }

    for (int i = 0; i < 2048; i += 64) {
        result = result.xor(key.shiftRight(i).and(mask));
    }

    return result;
}
Calculating number of bits and number of words BigInteger

Calculating number of bits and number of words BigInteger


By : Jiri Kozel
Date : March 29 2020, 07:55 AM
I hope this helps . To represent decimal number of numDigits as binary number, it requires
code :
numDigits * Math.log(10) / Math.log(2)
int numBits = (int)(((numDigits * bitsPerDigit[radix]) >>> 10) + 1);
Math.log(10) / Math.log(2) * Math.pow(2, 10) = 3401.6543691646593
Why Biginteger return non prime number and why less bits

Why Biginteger return non prime number and why less bits


By : Nidal HADDAD
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further I think you accidentally switched the parameters in exponent.modPow(randomServerPriemNumber, mod). a.modPow(b, c) evaluates to a^b mod c, not b^a mod c, but that shouldn't affect the result much, as all three numbers are 256bit length primes. As for the different bit lengths of the result, since the big length of BigInteger is the absolute minimum number of bits you would need to represent it, it differs for different values, even if they are modulo the same number.
Take, e.g. "10 mod 10" and "7 mod 10". The first evaluates to 0, with a bit length of 0. The second evaluates to 7, with a bit length 3.
How can you specify a BigInteger with a maximum number of bits of type BigInteger?

How can you specify a BigInteger with a maximum number of bits of type BigInteger?


By : SebB
Date : March 29 2020, 07:55 AM
With these it helps You can't. There is no constructor that takes a BigInteger number of bits.
Why not? BigInteger doesn't store the number of bits internally as a big integer. It's holds an int number of bits, a design decision reflected in the public API:
code :
BigInteger(int numBits, Random rnd);
int bitCount();
int bitLength();
static BigInteger probablePrime(int bitLength, Random rnd);
Related Posts Related Posts :
  • C# Local variables
  • How can I merge the results of a group by Linq-to-XML query?
  • How to add Report in ASP.NET Project
  • C# How to display all instances of a loop in a label?
  • C# subscribe a function to System.Action that is subscribed to another System.Action: why does order matter?
  • Is there any negative effect to setting SqlCommand's CommandTimeout to a high value?
  • C# - TreeView Context Menu Out of Place when using keyboard
  • How to read stored procedure output and return it as list
  • How do you maintain changes made by VisualState triggers after setting another VisualState?
  • Should I be unit testing my bootstrapper and if so how?
  • using .SingleOrDefault() inside .Where() will raise the following exception:- System.NotSupportedException was unhandled
  • C# How would I fill a Form1 Parameter in the same seperate class
  • Access gridview row's data from LinkButton inside that row
  • Translating excel function to c# Math.pow not resulting in same values
  • Arranging Ten Inputted Numbers into Ascending and Descending order
  • AsEnumerable and Query Syntax
  • How can I defensively code against randomly referencing "Table 0" and null values?
  • Changing xaml code position based on screen size
  • Castle Windsor resolve ienumerable and name
  • Drawing multiple sprites with a for loop xna 4.0
  • For loop to Populate Textblocks
  • Visual Studio 2015: Create an Empty Project
  • What are .NET classes to replace the old MSXML2.ServerXMLHTTP?
  • Handle leak in .Net threads
  • Excel add-in ribbon click events bubbling
  • validation rule needed for only numbers to be entered
  • Parsing complex XML, no descendent elements exists when selecting a named element
  • Web Api - IEnumerable with complex type as param is null
  • Email address input validation
  • .Net AND operator Regular Expression using strings in a document
  • Windows phone 8.1 POST x-www-form-urlencoded not working
  • Is there any way to make my C# XMLManager work?
  • ASP.NET 5 Console Application (package) - How to create DBContext from connection string?
  • How to use form's function in other class C#
  • WPF Zebra EPL2 Printing issue
  • C# use reflection to capture exception throw
  • Convert strings in DataRow to double
  • Xml-Serialization is not working
  • HTML Agility Pack can't find classes with trailing spaces
  • ComputeHash Calls Inexplicably Differ
  • Creating an array that holds both integers and datetime C#
  • GroupBy multiple columns in Linq with Take()
  • Rename multiple symbols at once? (using Roslyn)
  • Cast lambda in delegate
  • DataContractSerializer using default properties
  • LINQ Query Sum in recordset
  • change left-hand boolean value to be opposite of the right hand value
  • Get node from XmlDocument using xpath
  • Why does a Control's BeginInvoke() target delegate never occur after Dispose() is called on the Control?
  • A pattern for returning an object created by multiple repositories
  • Change Tracking in Excel
  • MVC5 Compilation Bug
  • where I need to set my await compared to the code
  • How to make the transition from "traditional" to reactive MVVM
  • Exception when calling RDORecipients.AddMultiple(ref Array, object) in Redemption
  • Switch a Task<T> where T is an enum
  • c# neo4j cypher use regular exp
  • Calling a method from a LINQ select
  • LINQ Specified Cast is Not Valid with a ushort Table Column
  • Why does ReSharper recommend the removal of its own fix?
  • shadow
    Privacy Policy - Terms - Contact Us © animezone.co