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.