Module openssl::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.