bad-antics commented on issue #2035:
URL: https://github.com/apache/iceberg-rust/issues/2035#issuecomment-3832219485
Great addition for the Rust implementation! Looking at the Java Ciphers.java
implementation, here's a suggested approach for Rust:
**AES-GCM utilities in Rust:**
```rust
use aes_gcm::{
aead::{Aead, KeyInit},
Aes256Gcm, Nonce
};
pub struct IcebergCipher {
cipher: Aes256Gcm,
}
impl IcebergCipher {
const NONCE_SIZE: usize = 12;
const TAG_SIZE: usize = 16;
pub fn new(key: &[u8; 32]) -> Self {
Self {
cipher: Aes256Gcm::new(key.into()),
}
}
pub fn encrypt(&self, plaintext: &[u8], aad: &[u8]) -> Result<Vec<u8>,
Error> {
let nonce = generate_nonce();
let mut ciphertext = self.cipher
.encrypt(&nonce.into(), plaintext)?;
// Prepend nonce to ciphertext (matching Java impl)
let mut result = nonce.to_vec();
result.append(&mut ciphertext);
Ok(result)
}
pub fn decrypt(&self, ciphertext: &[u8]) -> Result<Vec<u8>, Error> {
let (nonce, encrypted) = ciphertext.split_at(Self::NONCE_SIZE);
self.cipher.decrypt(nonce.into(), encrypted)
}
}
```
**Dependencies:**
```toml
aes-gcm = "0.10"
rand = "0.8"
```
Key considerations:
- Match Java's nonce/IV handling for interoperability
- Use `ring` or `aes-gcm` crate
- Consider async variants for large files
Happy to help contribute!
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