Module bn

BigNum implementation

Large numbers are important for a cryptographic library. OpenSSL implementation of BigNum uses dynamically assigned memory to store an array of bit chunks. This allows numbers of any size to be compared and mathematical functions performed.

OpenSSL wiki describes the BIGNUM data structure.

Examples

use openssl::bn::BigNum;
use openssl::error::ErrorStack;

fn main() -> Result<(), ErrorStack> {
  let a = BigNum::new()?; // a = 0
  let b = BigNum::from_dec_str("1234567890123456789012345")?;
  let c = &a * &b;
  assert_eq!(a, c);
  Ok(())
}

Structs

BigNum

Dynamically sized large number implementation

BigNumContext

Temporary storage for BigNums on the secure heap

BigNumContextRef

Reference to BigNumContext

BigNumRef

Reference to a BigNum

MsbOption

Options for the most significant bits of a randomly generated BigNum.