Function random_alphanumeric 

pub fn random_alphanumeric(len: usize) -> Result<String>

Available on crate feature tier3 only.

Generate a cryptographically-secure ASCII alphanumeric string (A-Z, a-z, 0-9) of exactly len characters.

Equivalent to random_string(len, charsets::ALPHANUMERIC).

Example

use mod_rand::tier3;
let token = tier3::random_alphanumeric(32)?;
assert_eq!(token.len(), 32);