一、选择使用 rust-crypto
rust-crypto 官方相关站点
crates.io
https://crates.io/crates/rust-crypto
repository
https://github.com/DaGenix/rust-crypto
documentation （以0.2.36为例）
https://docs.rs/rust-crypto/0.2.36
二、Cargo.toml 文件
[dependencies]
rust-crypto = "0.2.36"
三、工具类
说明：这里使用的是AES256/CBC/Pkcs加解密格式。
因此，key的长度为 256bits (32Bytes) iv的长度为128bits (16Bytes)
1、加密
/// Encrypt a buffer with the given key and iv using AES256/CBC/Pkcs encryption.
fn aes256_cbc_encrypt(
data: &[u8],
key: &[u8; 32],
iv: &[u8; 16],
) -> Result<Vec<u8>, SymmetricCipherError> {
let mut encryptor = aes::cbc_encryptor(
KeySize256,
key, iv,
PkcsPadding,
);
let mut buffer = [0; 4096];
let mut write_buffer = RefWriteBuffer::new(&mut buffer);
let mut read_buffer = RefReadBuffer::new(data);
let mut final_result = Vec::new();
loop {
let result = encryptor.encrypt(&mut read_buffer, &mut write_buffer, true)?;
final_result.extend(write_buffer.take_read_buffer().take_remaining().iter().map(|&i| i));
match result {
BufferUnderflow => break,
_ => continue,
}
}
Ok(final_result)
}
2、解密
/// Decrypt a buffer with the given key and iv using AES256/CBC/Pkcs encryption.
fn aes256_cbc_decrypt(
data: &[u8],
key: &[u8; 32],
iv: &[u8; 16],
) -> Result<Vec<u8>, SymmetricCipherError> {
let mut decryptor = aes::cbc_decryptor(
KeySize256,
key, iv,
PkcsPadding,
);
let mut buffer = [0; 4096];
let mut write_buffer = RefWriteBuffer::new(&mut buffer);
let mut read_buffer = RefReadBuffer::new(data);
let mut final_result = Vec::new();
loop {
let result = decryptor.decrypt(&mut read_buffer, &mut write_buffer, true)?;
final_result.extend(write_buffer.take_read_buffer().take_remaining().iter().map(|&i| i));
match result {
BufferUnderflow => break,
_ => continue,
}
}
Ok(final_result)
}
3、测试样例
3.1、生成随机key和iv
因为仅用作测试，所以才使用随机key和iv，应用场景注意使用固定值！
这里我们使用的crate是rand。
首先在Cargo.toml中引入：
[dependencies]
rand = "0.8.4"
3.2、编写测试用例
#[test]
fn test_aes256_cbc() {
use rand::{RngCore, rngs::OsRng};
let mut rng = OsRng::default();
let mut key = [0; 32];
let mut iv = [0; 16];
rng.fill_bytes(&mut key);
rng.fill_bytes(&mut iv);
let data = "Hello, world!";
let encrypted_data = aes256_cbc_encrypt(data.as_bytes(), &key, &iv).unwrap();
let decrypted_data = aes256_cbc_decrypt(encrypted_data.as_slice(), &key, &iv).unwrap();
let result = str::from_utf8(decrypted_data.as_slice()).unwrap();
assert_eq!(data, result);
println!("{}", result);
}
最后，执行测试用例，测试成功！
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