Rust实现AES加解密详解
目录
- 一、选择使用 rust-crypto
- 二、Cargo.toml 文件
- 三、工具类
- 1、加密
- 2、解密
- 3、测试样例
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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