Simple example to encrypt and decrypt with Rust cryptostream24.04.21

1.Cargo.toml

[dependencies]
cryptostream = "0.1.0"
base64 = "0.13.0"
openssl = { version = "0.10" }

1. Source file: 
use base64::{encode,decode};
use cryptostream::{read, write};
use openssl::symm::{Cipher, Crypter, Mode};
use std::io::Read;
use std::io::Write;

pub fn test()
{
  let t = "hello world".to_string();
  let ct = encrypt(t);
  let s = decrypt(ct);
  println!("{:?}", s.to_string());

}

pub fn encrypt(t: String) -> String
{
  let src: &[u8] = &t.into_bytes();
  let key: Vec<_> = decode("kjtbxCPw3XPFThb3mKmzfg==").unwrap();
  let iv: Vec<_> = decode("dB0Ej+7zWZWTS5JUCldWMg==").unwrap();
  let cipher = Cipher::aes_128_cbc();
  let mut encrypted = Vec::new();
  let mut bytes_written = 0;
  {
    let mut encryptor = write::Encryptor::new(&mut encrypted, cipher, &key,&iv).unwrap();
    while bytes_written < src.len()
    {
      let write_bytes = encryptor.write(&src[bytes_written..]).unwrap();
      bytes_written += write_bytes;
    }
  }

let ct = encode(encrypted);
    return ct;
}

pub fn decrypt(ct: String) -> String
{
  let src: Vec<u8> = decode(ct).unwrap();
  let key: Vec<_> = decode("kjtbxCPw3XPFThb3mKmzfg==").unwrap();
  let iv: Vec<_> = decode("dB0Ej+7zWZWTS5JUCldWMg==").unwrap();
  let mut decrypted = Vec::new();
  {
    let mut decryptor =
    write::Decryptor::new(&mut decrypted, Cipher::aes_128_cbc(), &key,&iv).unwrap();
    let mut bytes_decrypted = 0;
    while bytes_decrypted != src.len()
    {
      let write_count = decryptor.write(&src[bytes_decrypted..]).unwrap();
      bytes_decrypted += write_count;
    }
  }
  let t = String::from_utf8_lossy(&decrypted);
  return t.into_owned(); // memory is allocated for a new stri                                                                                                                             
}

https://docs.rs/cryptostream/0.3.1/cryptostream/

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Simple example to encrypt and decrypt with Rust cryptostream24.04.21

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