feat(encryption) [5/N] Support encryption: Encryption Manager

crates/iceberg/src/encryption/crypto.rs

@@ -177,6 +177,15 @@ impl SecureKey {
     }
 }
 
+impl TryFrom<SensitiveBytes> for SecureKey {
+    type Error = Error;
+
+    fn try_from(key: SensitiveBytes) -> Result<Self> {
+        let key_size = AesKeySize::from_key_length(key.len())?;
+        Ok(Self { key, key_size })
+    }
+}
+
 /// AES-GCM cipher for encrypting and decrypting data.
 pub struct AesGcmCipher {
     key: SensitiveBytes,

crates/iceberg/src/encryption/io.rs

@@ -0,0 +1,154 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+//! Encrypted file wrappers for InputFile / OutputFile.
+
+use std::sync::Arc;
+
+use bytes::Bytes;
+
+use super::file_decryptor::AesGcmFileDecryptor;
+use super::file_encryptor::AesGcmFileEncryptor;
+use crate::io::{FileMetadata, FileRead, FileWrite, InputFile, OutputFile};
+
+/// An AGS1 stream-encrypted input file wrapping a plain [`InputFile`].
+///
+/// Transparently decrypts on read.
+pub struct EncryptedInputFile {
+    inner: InputFile,
+    decryptor: Arc<AesGcmFileDecryptor>,
+}
+
+impl EncryptedInputFile {
+    /// Creates a new encrypted input file.
+    pub fn new(inner: InputFile, decryptor: Arc<AesGcmFileDecryptor>) -> Self {
+        Self { inner, decryptor }
+    }
+
+    /// Absolute path of the file.
+    pub fn location(&self) -> &str {
+        self.inner.location()
+    }
+
+    /// Check if file exists.
+    pub async fn exists(&self) -> crate::Result<bool> {
+        self.inner.exists().await
+    }
+
+    /// Fetch and returns metadata of file.
+    ///
+    /// The returned size is the **plaintext** size.
+    pub async fn metadata(&self) -> crate::Result<FileMetadata> {
+        let raw_meta = self.inner.metadata().await?;
+        let plaintext_size = self.decryptor.plaintext_length(raw_meta.size)?;
+        Ok(FileMetadata {
+            size: plaintext_size,
+        })
+    }
+
+    /// Read and returns whole content of file (decrypted plaintext).
+    pub async fn read(&self) -> crate::Result<Bytes> {
+        let meta = self.metadata().await?;
+        let reader = self.reader().await?;
+        reader.read(0..meta.size).await
+    }
+
+    /// Creates a reader that transparently decrypts on each read.
+    pub async fn reader(&self) -> crate::Result<Box<dyn FileRead>> {
+        let raw_meta = self.inner.metadata().await?;
+        let raw_reader = self.inner.reader().await?;
+        self.decryptor.wrap_reader(raw_reader, raw_meta.size)
+    }
+
+    /// Consumes self and returns the underlying plain input file.
+    pub fn into_inner(self) -> InputFile {
+        self.inner
+    }
+}
+
+impl std::fmt::Debug for EncryptedInputFile {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.debug_struct("EncryptedInputFile")
+            .field("path", &self.inner.location())
+            .finish_non_exhaustive()
+    }
+}
+
+/// An AGS1 stream-encrypted output file wrapping a plain [`OutputFile`].
+///
+/// Transparently encrypts on write.
+pub struct EncryptedOutputFile {
+    inner: OutputFile,
+    key_metadata: Box<[u8]>,
+    encryptor: Arc<AesGcmFileEncryptor>,
+}
+
+impl EncryptedOutputFile {
+    /// Creates a new encrypted output file.
+    pub fn new(
+        inner: OutputFile,
+        key_metadata: Box<[u8]>,
+        encryptor: Arc<AesGcmFileEncryptor>,
+    ) -> Self {
+        Self {
+            inner,
+            key_metadata,
+            encryptor,
+        }
+    }
+
+    /// Returns the key metadata bytes (for storage in manifest/data files).
+    pub fn key_metadata(&self) -> &[u8] {
+        &self.key_metadata
+    }
+
+    /// Absolute path of the file.
+    pub fn location(&self) -> &str {
+        self.inner.location()
+    }
+
+    /// Creates a writer that transparently encrypts on each write.
+    pub async fn writer(&self) -> crate::Result<Box<dyn FileWrite>> {
+        let raw_writer = self.inner.writer().await?;
+        Ok(self.encryptor.wrap_writer(raw_writer))
+    }
+
+    /// Write bytes to file (transparently encrypted).
+    pub async fn write(&self, bs: Bytes) -> crate::Result<()> {
+        let mut writer = self.writer().await?;
+        writer.write(bs).await?;
+        writer.close().await
+    }
+
+    /// Deletes the underlying file.
+    pub async fn delete(&self) -> crate::Result<()> {
+        self.inner.delete().await
+    }
+
+    /// Consumes self and returns the underlying plain output file.
+    pub fn into_inner(self) -> OutputFile {
+        self.inner
+    }
+}
+
+impl std::fmt::Debug for EncryptedOutputFile {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.debug_struct("EncryptedOutputFile")
+            .field("path", &self.inner.location())
+            .finish_non_exhaustive()
+    }
+}