feat(encryption): add managed encryption support for SSE-S3 and SSE-KMS (#583)

Signed-off-by: junxiang Mu <1948535941@qq.com>

crates/e2e_test/src/kms/encryption_metadata_test.rs

@@ -0,0 +1,386 @@
+// Copyright 2024 RustFS Team
+//
+// Licensed 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.
+
+//! Integration tests that focus on surface headers/metadata emitted by the
+//! managed encryption pipeline (SSE-S3/SSE-KMS).
+
+use super::common::LocalKMSTestEnvironment;
+use crate::common::{TEST_BUCKET, init_logging};
+use aws_sdk_s3::primitives::ByteStream;
+use aws_sdk_s3::types::{
+    CompletedMultipartUpload, CompletedPart, ServerSideEncryption, ServerSideEncryptionByDefault,
+    ServerSideEncryptionConfiguration, ServerSideEncryptionRule,
+};
+use serial_test::serial;
+use std::collections::{HashMap, VecDeque};
+use tracing::info;
+
+fn assert_encryption_metadata(metadata: &HashMap<String, String>, expected_size: usize) {
+    for key in [
+        "x-rustfs-encryption-key",
+        "x-rustfs-encryption-iv",
+        "x-rustfs-encryption-context",
+        "x-rustfs-encryption-original-size",
+    ] {
+        assert!(metadata.contains_key(key), "expected managed encryption metadata '{}' to be present", key);
+        assert!(
+            !metadata.get(key).unwrap().is_empty(),
+            "managed encryption metadata '{}' should not be empty",
+            key
+        );
+    }
+
+    let size_value = metadata
+        .get("x-rustfs-encryption-original-size")
+        .expect("managed encryption metadata should include original size");
+    let parsed_size: usize = size_value
+        .parse()
+        .expect("x-rustfs-encryption-original-size should be numeric");
+    assert_eq!(parsed_size, expected_size, "recorded original size should match uploaded payload length");
+}
+
+fn assert_storage_encrypted(storage_root: &std::path::Path, bucket: &str, key: &str, plaintext: &[u8]) {
+    let mut stack = VecDeque::from([storage_root.to_path_buf()]);
+    let mut scanned = 0;
+    let mut plaintext_path: Option<std::path::PathBuf> = None;
+
+    while let Some(current) = stack.pop_front() {
+        let Ok(metadata) = std::fs::metadata(&current) else { continue };
+        if metadata.is_dir() {
+            if let Ok(entries) = std::fs::read_dir(&current) {
+                for entry in entries.flatten() {
+                    stack.push_back(entry.path());
+                }
+            }
+            continue;
+        }
+
+        let path_str = current.to_string_lossy();
+        if !(path_str.contains(bucket) || path_str.contains(key)) {
+            continue;
+        }
+
+        scanned += 1;
+        let Ok(bytes) = std::fs::read(&current) else { continue };
+        if bytes.len() < plaintext.len() {
+            continue;
+        }
+        if bytes.windows(plaintext.len()).any(|window| window == plaintext) {
+            plaintext_path = Some(current);
+            break;
+        }
+    }
+
+    assert!(
+        scanned > 0,
+        "Failed to locate stored data files for bucket '{}' and key '{}' under {:?}",
+        bucket,
+        key,
+        storage_root
+    );
+    assert!(plaintext_path.is_none(), "Plaintext detected on disk at {:?}", plaintext_path.unwrap());
+}
+
+#[tokio::test]
+#[serial]
+async fn test_head_reports_managed_metadata_for_sse_s3() -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
+    init_logging();
+    info!("Validating SSE-S3 managed encryption metadata exposure");
+
+    let mut kms_env = LocalKMSTestEnvironment::new().await?;
+    let _default_key = kms_env.start_rustfs_for_local_kms().await?;
+    tokio::time::sleep(tokio::time::Duration::from_secs(3)).await;
+
+    let s3_client = kms_env.base_env.create_s3_client();
+    kms_env.base_env.create_test_bucket(TEST_BUCKET).await?;
+
+    // Bucket level default SSE-S3 configuration.
+    let encryption_config = ServerSideEncryptionConfiguration::builder()
+        .rules(
+            ServerSideEncryptionRule::builder()
+                .apply_server_side_encryption_by_default(
+                    ServerSideEncryptionByDefault::builder()
+                        .sse_algorithm(ServerSideEncryption::Aes256)
+                        .build()
+                        .unwrap(),
+                )
+                .build(),
+        )
+        .build()
+        .unwrap();
+
+    s3_client
+        .put_bucket_encryption()
+        .bucket(TEST_BUCKET)
+        .server_side_encryption_configuration(encryption_config)
+        .send()
+        .await?;
+
+    let payload = b"metadata-sse-s3-payload";
+    let key = "metadata-sse-s3-object";
+
+    s3_client
+        .put_object()
+        .bucket(TEST_BUCKET)
+        .key(key)
+        .body(payload.to_vec().into())
+        .send()
+        .await?;
+
+    let head = s3_client.head_object().bucket(TEST_BUCKET).key(key).send().await?;
+
+    assert_eq!(
+        head.server_side_encryption(),
+        Some(&ServerSideEncryption::Aes256),
+        "head_object should advertise SSE-S3"
+    );
+
+    let metadata = head
+        .metadata()
+        .expect("head_object should return managed encryption metadata");
+    assert_encryption_metadata(metadata, payload.len());
+
+    assert_storage_encrypted(std::path::Path::new(&kms_env.base_env.temp_dir), TEST_BUCKET, key, payload);
+
+    Ok(())
+}
+
+#[tokio::test]
+#[serial]
+async fn test_head_reports_managed_metadata_for_sse_kms_and_copy() -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
+    init_logging();
+    info!("Validating SSE-KMS managed encryption metadata (including copy)");
+
+    let mut kms_env = LocalKMSTestEnvironment::new().await?;
+    let default_key_id = kms_env.start_rustfs_for_local_kms().await?;
+    tokio::time::sleep(tokio::time::Duration::from_secs(3)).await;
+
+    let s3_client = kms_env.base_env.create_s3_client();
+    kms_env.base_env.create_test_bucket(TEST_BUCKET).await?;
+
+    let encryption_config = ServerSideEncryptionConfiguration::builder()
+        .rules(
+            ServerSideEncryptionRule::builder()
+                .apply_server_side_encryption_by_default(
+                    ServerSideEncryptionByDefault::builder()
+                        .sse_algorithm(ServerSideEncryption::AwsKms)
+                        .kms_master_key_id(&default_key_id)
+                        .build()
+                        .unwrap(),
+                )
+                .build(),
+        )
+        .build()
+        .unwrap();
+
+    s3_client
+        .put_bucket_encryption()
+        .bucket(TEST_BUCKET)
+        .server_side_encryption_configuration(encryption_config)
+        .send()
+        .await?;
+
+    let payload = b"metadata-sse-kms-payload";
+    let source_key = "metadata-sse-kms-object";
+
+    s3_client
+        .put_object()
+        .bucket(TEST_BUCKET)
+        .key(source_key)
+        .body(payload.to_vec().into())
+        .send()
+        .await?;
+
+    let head_source = s3_client.head_object().bucket(TEST_BUCKET).key(source_key).send().await?;
+
+    assert_eq!(
+        head_source.server_side_encryption(),
+        Some(&ServerSideEncryption::AwsKms),
+        "source object should report SSE-KMS"
+    );
+    assert_eq!(
+        head_source.ssekms_key_id().unwrap(),
+        &default_key_id,
+        "source object should maintain the configured KMS key id"
+    );
+    let source_metadata = head_source
+        .metadata()
+        .expect("source object should include managed encryption metadata");
+    assert_encryption_metadata(source_metadata, payload.len());
+
+    let dest_key = "metadata-sse-kms-object-copy";
+    let copy_source = format!("{}/{}", TEST_BUCKET, source_key);
+
+    s3_client
+        .copy_object()
+        .bucket(TEST_BUCKET)
+        .key(dest_key)
+        .copy_source(copy_source)
+        .send()
+        .await?;
+
+    let head_dest = s3_client.head_object().bucket(TEST_BUCKET).key(dest_key).send().await?;
+
+    assert_eq!(
+        head_dest.server_side_encryption(),
+        Some(&ServerSideEncryption::AwsKms),
+        "copied object should remain encrypted with SSE-KMS"
+    );
+    assert_eq!(
+        head_dest.ssekms_key_id().unwrap(),
+        &default_key_id,
+        "copied object should keep the default KMS key id"
+    );
+    let dest_metadata = head_dest
+        .metadata()
+        .expect("copied object should include managed encryption metadata");
+    assert_encryption_metadata(dest_metadata, payload.len());
+
+    let copied_body = s3_client
+        .get_object()
+        .bucket(TEST_BUCKET)
+        .key(dest_key)
+        .send()
+        .await?
+        .body
+        .collect()
+        .await?
+        .into_bytes();
+    assert_eq!(&copied_body[..], payload, "copied object payload should match source");
+
+    let storage_root = std::path::Path::new(&kms_env.base_env.temp_dir);
+    assert_storage_encrypted(storage_root, TEST_BUCKET, source_key, payload);
+    assert_storage_encrypted(storage_root, TEST_BUCKET, dest_key, payload);
+
+    Ok(())
+}
+
+#[tokio::test]
+#[serial]
+async fn test_multipart_upload_writes_encrypted_data() -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
+    init_logging();
+    info!("Validating ciphertext persistence for multipart SSE-KMS uploads");
+
+    let mut kms_env = LocalKMSTestEnvironment::new().await?;
+    let default_key_id = kms_env.start_rustfs_for_local_kms().await?;
+    tokio::time::sleep(tokio::time::Duration::from_secs(3)).await;
+
+    let s3_client = kms_env.base_env.create_s3_client();
+    kms_env.base_env.create_test_bucket(TEST_BUCKET).await?;
+
+    let encryption_config = ServerSideEncryptionConfiguration::builder()
+        .rules(
+            ServerSideEncryptionRule::builder()
+                .apply_server_side_encryption_by_default(
+                    ServerSideEncryptionByDefault::builder()
+                        .sse_algorithm(ServerSideEncryption::AwsKms)
+                        .kms_master_key_id(&default_key_id)
+                        .build()
+                        .unwrap(),
+                )
+                .build(),
+        )
+        .build()
+        .unwrap();
+
+    s3_client
+        .put_bucket_encryption()
+        .bucket(TEST_BUCKET)
+        .server_side_encryption_configuration(encryption_config)
+        .send()
+        .await?;
+
+    let key = "multipart-encryption-object";
+    let part_size = 5 * 1024 * 1024; // minimum part size required by S3 semantics
+    let part_one = vec![0xA5; part_size];
+    let part_two = vec![0x5A; part_size];
+    let combined: Vec<u8> = part_one.iter().chain(part_two.iter()).copied().collect();
+
+    let create_output = s3_client
+        .create_multipart_upload()
+        .bucket(TEST_BUCKET)
+        .key(key)
+        .send()
+        .await?;
+
+    let upload_id = create_output.upload_id().unwrap();
+
+    let part1 = s3_client
+        .upload_part()
+        .bucket(TEST_BUCKET)
+        .key(key)
+        .upload_id(upload_id)
+        .part_number(1)
+        .body(ByteStream::from(part_one.clone()))
+        .send()
+        .await?;
+
+    let part2 = s3_client
+        .upload_part()
+        .bucket(TEST_BUCKET)
+        .key(key)
+        .upload_id(upload_id)
+        .part_number(2)
+        .body(ByteStream::from(part_two.clone()))
+        .send()
+        .await?;
+
+    let completed = CompletedMultipartUpload::builder()
+        .parts(CompletedPart::builder().part_number(1).e_tag(part1.e_tag().unwrap()).build())
+        .parts(CompletedPart::builder().part_number(2).e_tag(part2.e_tag().unwrap()).build())
+        .build();
+
+    s3_client
+        .complete_multipart_upload()
+        .bucket(TEST_BUCKET)
+        .key(key)
+        .upload_id(upload_id)
+        .multipart_upload(completed)
+        .send()
+        .await?;
+
+    let head = s3_client.head_object().bucket(TEST_BUCKET).key(key).send().await?;
+    assert_eq!(
+        head.server_side_encryption(),
+        Some(&ServerSideEncryption::AwsKms),
+        "multipart head_object should expose SSE-KMS"
+    );
+    assert_eq!(
+        head.ssekms_key_id().unwrap(),
+        &default_key_id,
+        "multipart object should retain bucket default KMS key"
+    );
+
+    assert_encryption_metadata(
+        head.metadata().expect("multipart head_object should expose managed metadata"),
+        combined.len(),
+    );
+
+    // Data returned to clients should decrypt back to original payload
+    let fetched = s3_client
+        .get_object()
+        .bucket(TEST_BUCKET)
+        .key(key)
+        .send()
+        .await?
+        .body
+        .collect()
+        .await?
+        .into_bytes();
+    assert_eq!(&fetched[..], &combined[..]);
+
+    assert_storage_encrypted(std::path::Path::new(&kms_env.base_env.temp_dir), TEST_BUCKET, key, &combined);
+
+    Ok(())
+}

crates/e2e_test/src/kms/mod.rs

@@ -44,3 +44,6 @@ mod test_runner;
 
 #[cfg(test)]
 mod bucket_default_encryption_test;
+
+#[cfg(test)]
+mod encryption_metadata_test;

crates/ecstore/src/set_disk.rs

@@ -2143,6 +2143,7 @@ impl SetDisks {
     where
         W: AsyncWrite + Send + Sync + Unpin + 'static,
     {
+        tracing::debug!(bucket, object, requested_length = length, offset, "get_object_with_fileinfo start");
         let (disks, files) = Self::shuffle_disks_and_parts_metadata_by_index(disks, &files, &fi);
 
         let total_size = fi.size as usize;
@@ -2160,28 +2161,46 @@ impl SetDisks {
 
         let (part_index, mut part_offset) = fi.to_part_offset(offset)?;
 
-        // debug!(
-        //     "get_object_with_fileinfo start offset:{}, part_index:{},part_offset:{}",
-        //     offset, part_index, part_offset
-        // );
-
         let mut end_offset = offset;
         if length > 0 {
             end_offset += length - 1
         }
 
-        let (last_part_index, _) = fi.to_part_offset(end_offset)?;
+        let (last_part_index, last_part_relative_offset) = fi.to_part_offset(end_offset)?;
+
+        tracing::debug!(
+            bucket,
+            object,
+            offset,
+            length,
+            end_offset,
+            part_index,
+            last_part_index,
+            last_part_relative_offset,
+            "Multipart read bounds"
+        );
 
         let erasure = erasure_coding::Erasure::new(fi.erasure.data_blocks, fi.erasure.parity_blocks, fi.erasure.block_size);
 
+        let part_indices: Vec<usize> = (part_index..=last_part_index).collect();
+        tracing::debug!(bucket, object, ?part_indices, "Multipart part indices to stream");
+
         let mut total_read = 0;
-        for i in part_index..=last_part_index {
+        for current_part in part_indices {
             if total_read == length {
+                tracing::debug!(
+                    bucket,
+                    object,
+                    total_read,
+                    requested_length = length,
+                    part_index = current_part,
+                    "Stopping multipart stream early because accumulated bytes match request"
+                );
                 break;
             }
 
-            let part_number = fi.parts[i].number;
+            let part_number = fi.parts[current_part].number;
-            let part_size = fi.parts[i].size;
+            let part_size = fi.parts[current_part].size;
             let mut part_length = part_size - part_offset;
             if part_length > (length - total_read) {
                 part_length = length - total_read
@@ -2191,6 +2210,21 @@ impl SetDisks {
 
             let read_offset = (part_offset / erasure.block_size) * erasure.shard_size();
 
+            tracing::debug!(
+                bucket,
+                object,
+                part_index = current_part,
+                part_number,
+                part_offset,
+                part_size,
+                part_length,
+                read_offset,
+                till_offset,
+                total_read_before = total_read,
+                requested_length = length,
+                "Streaming multipart part"
+            );
+
             let mut readers = Vec::with_capacity(disks.len());
             let mut errors = Vec::with_capacity(disks.len());
             for (idx, disk_op) in disks.iter().enumerate() {
@@ -2236,6 +2270,15 @@ impl SetDisks {
             //     part_number, part_offset, part_length, part_size
             // );
             let (written, err) = erasure.decode(writer, readers, part_offset, part_length, part_size).await;
+            tracing::debug!(
+                bucket,
+                object,
+                part_index = current_part,
+                part_number,
+                part_length,
+                bytes_written = written,
+                "Finished decoding multipart part"
+            );
             if let Some(e) = err {
                 let de_err: DiskError = e.into();
                 let mut has_err = true;
@@ -2274,6 +2317,8 @@ impl SetDisks {
 
         // debug!("read end");
 
+        tracing::debug!(bucket, object, total_read, expected_length = length, "Multipart read finished");
+
         Ok(())
     }
 
@@ -3462,12 +3507,13 @@ impl ObjectIO for SetDisks {
         // let _guard_to_hold = _read_lock_guard; // moved into closure below
         tokio::spawn(async move {
             // let _guard = _guard_to_hold; // keep guard alive until task ends
+            let mut writer = wd;
             if let Err(e) = Self::get_object_with_fileinfo(
                 &bucket,
                 &object,
                 offset,
                 length,
-                &mut Box::new(wd),
+                &mut writer,
                 fi,
                 files,
                 &disks,
@@ -5377,6 +5423,7 @@ impl StorageAPI for SetDisks {
             }
 
             let ext_part = &curr_fi.parts[i];
+            tracing::info!(target:"rustfs_ecstore::set_disk", part_number = p.part_num, part_size = ext_part.size, part_actual_size = ext_part.actual_size, "Completing multipart part");
 
             if p.etag != Some(ext_part.etag.clone()) {
                 error!(
@@ -5436,6 +5483,9 @@ impl StorageAPI for SetDisks {
         fi.metadata
             .insert(format!("{RESERVED_METADATA_PREFIX_LOWER}actual-size"), object_actual_size.to_string());
 
+        fi.metadata
+            .insert("x-rustfs-encryption-original-size".to_string(), object_actual_size.to_string());
+
         if fi.is_compressed() {
             fi.metadata
                 .insert(format!("{RESERVED_METADATA_PREFIX_LOWER}compression-size"), object_size.to_string());

crates/rio/src/encrypt_reader.rs

@@ -23,6 +23,7 @@ use rustfs_utils::{put_uvarint, put_uvarint_len};
 use std::pin::Pin;
 use std::task::{Context, Poll};
 use tokio::io::{AsyncRead, ReadBuf};
+use tracing::debug;
 
 pin_project! {
     /// A reader wrapper that encrypts data on the fly using AES-256-GCM.
@@ -119,7 +120,7 @@ where
                     header[5] = ((crc >> 8) & 0xFF) as u8;
                     header[6] = ((crc >> 16) & 0xFF) as u8;
                     header[7] = ((crc >> 24) & 0xFF) as u8;
-                    println!(
+                    debug!(
                         "encrypt block header typ=0 len={} header={:?} plaintext_len={} ciphertext_len={}",
                         clen,
                         header,
@@ -184,7 +185,10 @@ pin_project! {
         #[pin]
         pub inner: R,
         key: [u8; 32],   // AES-256-GCM key
-        nonce: [u8; 12], // 96-bit nonce for GCM
+        base_nonce: [u8; 12], // Base nonce recorded in object metadata
+        current_nonce: [u8; 12], // Active nonce for the current encrypted segment
+        multipart_mode: bool,
+        current_part: usize,
         buffer: Vec<u8>,
         buffer_pos: usize,
         finished: bool,
@@ -206,7 +210,35 @@ where
         Self {
             inner,
             key,
-            nonce,
+            base_nonce: nonce,
+            current_nonce: nonce,
+            multipart_mode: false,
+            current_part: 0,
+            buffer: Vec::new(),
+            buffer_pos: 0,
+            finished: false,
+            header_buf: [0u8; 8],
+            header_read: 0,
+            header_done: false,
+            ciphertext_buf: None,
+            ciphertext_read: 0,
+            ciphertext_len: 0,
+        }
+    }
+
+    pub fn new_multipart(inner: R, key: [u8; 32], base_nonce: [u8; 12]) -> Self {
+        let first_part = 1;
+        let initial_nonce = derive_part_nonce(&base_nonce, first_part);
+
+        debug!("decrypt_reader: initialized multipart mode");
+
+        Self {
+            inner,
+            key,
+            base_nonce,
+            current_nonce: initial_nonce,
+            multipart_mode: true,
+            current_part: first_part,
             buffer: Vec::new(),
             buffer_pos: 0,
             finished: false,
@@ -287,7 +319,23 @@ where
             *this.header_done = false;
 
             if typ == 0xFF {
+                if *this.multipart_mode {
+                    debug!(
+                        next_part = *this.current_part + 1,
+                        "decrypt_reader: reached segment terminator, advancing to next part"
+                    );
+                    *this.current_part += 1;
+                    *this.current_nonce = derive_part_nonce(this.base_nonce, *this.current_part);
+                    this.ciphertext_buf.take();
+                    *this.ciphertext_read = 0;
+                    *this.ciphertext_len = 0;
+                    continue;
+                }
+
                 *this.finished = true;
+                this.ciphertext_buf.take();
+                *this.ciphertext_read = 0;
+                *this.ciphertext_len = 0;
                 continue;
             }
 
@@ -342,11 +390,17 @@ where
             let ciphertext = &ciphertext_buf[uvarint_len as usize..];
 
             let cipher = Aes256Gcm::new_from_slice(this.key).expect("key");
-            let nonce = Nonce::from_slice(this.nonce);
+            let nonce = Nonce::from_slice(this.current_nonce);
             let plaintext = cipher
                 .decrypt(nonce, ciphertext)
                 .map_err(|e| std::io::Error::other(format!("decrypt error: {e}")))?;
 
+            debug!(
+                part = *this.current_part,
+                plaintext_len = plaintext.len(),
+                "decrypt_reader: decrypted chunk"
+            );
+
             if plaintext.len() != plaintext_len as usize {
                 this.ciphertext_buf.take();
                 *this.ciphertext_read = 0;
@@ -407,6 +461,16 @@ where
     }
 }
 
+fn derive_part_nonce(base: &[u8; 12], part_number: usize) -> [u8; 12] {
+    let mut nonce = *base;
+    let mut suffix = [0u8; 4];
+    suffix.copy_from_slice(&nonce[8..12]);
+    let current = u32::from_be_bytes(suffix);
+    let next = current.wrapping_add(part_number as u32);
+    nonce[8..12].copy_from_slice(&next.to_be_bytes());
+    nonce
+}
+
 #[cfg(test)]
 mod tests {
     use std::io::Cursor;
@@ -495,4 +559,42 @@ mod tests {
 
         assert_eq!(&decrypted, &data);
     }
+
+    #[tokio::test]
+    async fn test_decrypt_reader_multipart_segments() {
+        let mut key = [0u8; 32];
+        let mut base_nonce = [0u8; 12];
+        rand::rng().fill_bytes(&mut key);
+        rand::rng().fill_bytes(&mut base_nonce);
+
+        let part_one = vec![0xA5; 512 * 1024];
+        let part_two = vec![0x5A; 256 * 1024];
+
+        async fn encrypt_part(data: &[u8], key: [u8; 32], base_nonce: [u8; 12], part_number: usize) -> Vec<u8> {
+            let nonce = derive_part_nonce(&base_nonce, part_number);
+            let reader = BufReader::new(Cursor::new(data.to_vec()));
+            let mut encrypt_reader = EncryptReader::new(WarpReader::new(reader), key, nonce);
+            let mut encrypted = Vec::new();
+            encrypt_reader.read_to_end(&mut encrypted).await.unwrap();
+            encrypted
+        }
+
+        let encrypted_one = encrypt_part(&part_one, key, base_nonce, 1).await;
+        let encrypted_two = encrypt_part(&part_two, key, base_nonce, 2).await;
+
+        let mut combined = Vec::with_capacity(encrypted_one.len() + encrypted_two.len());
+        combined.extend_from_slice(&encrypted_one);
+        combined.extend_from_slice(&encrypted_two);
+
+        let reader = BufReader::new(Cursor::new(combined));
+        let mut decrypt_reader = DecryptReader::new_multipart(WarpReader::new(reader), key, base_nonce);
+        let mut decrypted = Vec::new();
+        decrypt_reader.read_to_end(&mut decrypted).await.unwrap();
+
+        let mut expected = Vec::with_capacity(part_one.len() + part_two.len());
+        expected.extend_from_slice(&part_one);
+        expected.extend_from_slice(&part_two);
+
+        assert_eq!(decrypted, expected);
+    }
 }

rustfs/src/storage/ecfs.rs

@@ -71,8 +71,12 @@ use rustfs_ecstore::store_api::ObjectOptions;
 use rustfs_ecstore::store_api::ObjectToDelete;
 use rustfs_ecstore::store_api::PutObjReader;
 use rustfs_ecstore::store_api::StorageAPI;
+use rustfs_filemeta::fileinfo::ObjectPartInfo;
 use rustfs_filemeta::headers::RESERVED_METADATA_PREFIX_LOWER;
 use rustfs_filemeta::headers::{AMZ_DECODED_CONTENT_LENGTH, AMZ_OBJECT_TAGGING};
+use rustfs_kms::DataKey;
+use rustfs_kms::service_manager::get_global_encryption_service;
+use rustfs_kms::types::{EncryptionMetadata, ObjectEncryptionContext};
 use rustfs_notify::global::notifier_instance;
 use rustfs_policy::auth;
 use rustfs_policy::policy::action::Action;
@@ -108,6 +112,7 @@ use std::sync::Arc;
 use std::sync::LazyLock;
 use time::OffsetDateTime;
 use time::format_description::well_known::Rfc3339;
+use tokio::io::AsyncRead;
 use tokio::sync::mpsc;
 use tokio_stream::wrappers::ReceiverStream;
 use tokio_tar::Archive;
@@ -140,6 +145,199 @@ pub struct FS {
     // pub store: ECStore,
 }
 
+struct ManagedEncryptionMaterial {
+    data_key: DataKey,
+    headers: HashMap<String, String>,
+    kms_key_id: String,
+}
+
+async fn create_managed_encryption_material(
+    bucket: &str,
+    key: &str,
+    algorithm: &ServerSideEncryption,
+    kms_key_id: Option<String>,
+    original_size: i64,
+) -> Result<ManagedEncryptionMaterial, ApiError> {
+    let Some(service) = get_global_encryption_service().await else {
+        return Err(ApiError::from(StorageError::other("KMS encryption service is not initialized")));
+    };
+
+    if !is_managed_sse(algorithm) {
+        return Err(ApiError::from(StorageError::other(format!(
+            "Unsupported server-side encryption algorithm: {}",
+            algorithm.as_str()
+        ))));
+    }
+
+    let algorithm_str = algorithm.as_str();
+
+    let mut context = ObjectEncryptionContext::new(bucket.to_string(), key.to_string());
+    if original_size >= 0 {
+        context = context.with_size(original_size as u64);
+    }
+
+    let mut kms_key_candidate = kms_key_id;
+    if kms_key_candidate.is_none() {
+        kms_key_candidate = service.get_default_key_id().cloned();
+    }
+
+    let kms_key_to_use = kms_key_candidate
+        .clone()
+        .ok_or_else(|| ApiError::from(StorageError::other("No KMS key available for managed server-side encryption")))?;
+
+    let (data_key, encrypted_data_key) = service
+        .create_data_key(&kms_key_candidate, &context)
+        .await
+        .map_err(|e| ApiError::from(StorageError::other(format!("Failed to create data key: {}", e))))?;
+
+    let metadata = EncryptionMetadata {
+        algorithm: algorithm_str.to_string(),
+        key_id: kms_key_to_use.clone(),
+        key_version: 1,
+        iv: data_key.nonce.to_vec(),
+        tag: None,
+        encryption_context: context.encryption_context.clone(),
+        encrypted_at: Utc::now(),
+        original_size: if original_size >= 0 { original_size as u64 } else { 0 },
+        encrypted_data_key,
+    };
+
+    let mut headers = service.metadata_to_headers(&metadata);
+    headers.insert("x-rustfs-encryption-original-size".to_string(), metadata.original_size.to_string());
+
+    Ok(ManagedEncryptionMaterial {
+        data_key,
+        headers,
+        kms_key_id: kms_key_to_use,
+    })
+}
+
+async fn decrypt_managed_encryption_key(
+    bucket: &str,
+    key: &str,
+    metadata: &HashMap<String, String>,
+) -> Result<Option<([u8; 32], [u8; 12], Option<i64>)>, ApiError> {
+    if !metadata.contains_key("x-rustfs-encryption-key") {
+        return Ok(None);
+    }
+
+    let Some(service) = get_global_encryption_service().await else {
+        return Err(ApiError::from(StorageError::other("KMS encryption service is not initialized")));
+    };
+
+    let parsed = service
+        .headers_to_metadata(metadata)
+        .map_err(|e| ApiError::from(StorageError::other(format!("Failed to parse encryption metadata: {}", e))))?;
+
+    if parsed.iv.len() != 12 {
+        return Err(ApiError::from(StorageError::other("Invalid encryption nonce length; expected 12 bytes")));
+    }
+
+    let context = ObjectEncryptionContext::new(bucket.to_string(), key.to_string());
+    let data_key = service
+        .decrypt_data_key(&parsed.encrypted_data_key, &context)
+        .await
+        .map_err(|e| ApiError::from(StorageError::other(format!("Failed to decrypt data key: {}", e))))?;
+
+    let key_bytes = data_key.plaintext_key;
+    let mut nonce = [0u8; 12];
+    nonce.copy_from_slice(&parsed.iv[..12]);
+
+    let original_size = metadata
+        .get("x-rustfs-encryption-original-size")
+        .and_then(|s| s.parse::<i64>().ok());
+
+    Ok(Some((key_bytes, nonce, original_size)))
+}
+
+fn derive_part_nonce(base: [u8; 12], part_number: usize) -> [u8; 12] {
+    let mut nonce = base;
+    let current = u32::from_be_bytes([nonce[8], nonce[9], nonce[10], nonce[11]]);
+    let incremented = current.wrapping_add(part_number as u32);
+    nonce[8..12].copy_from_slice(&incremented.to_be_bytes());
+    nonce
+}
+
+struct InMemoryAsyncReader {
+    cursor: std::io::Cursor<Vec<u8>>,
+}
+
+impl InMemoryAsyncReader {
+    fn new(data: Vec<u8>) -> Self {
+        Self {
+            cursor: std::io::Cursor::new(data),
+        }
+    }
+}
+
+impl AsyncRead for InMemoryAsyncReader {
+    fn poll_read(
+        mut self: std::pin::Pin<&mut Self>,
+        _cx: &mut std::task::Context<'_>,
+        buf: &mut tokio::io::ReadBuf<'_>,
+    ) -> std::task::Poll<std::io::Result<()>> {
+        let unfilled = buf.initialize_unfilled();
+        let bytes_read = std::io::Read::read(&mut self.cursor, unfilled)?;
+        buf.advance(bytes_read);
+        std::task::Poll::Ready(Ok(()))
+    }
+}
+
+async fn decrypt_multipart_managed_stream(
+    mut encrypted_stream: Box<dyn AsyncRead + Unpin + Send + Sync>,
+    parts: &[ObjectPartInfo],
+    key_bytes: [u8; 32],
+    base_nonce: [u8; 12],
+) -> Result<(Box<dyn Reader>, i64), StorageError> {
+    let total_plain_capacity: usize = parts.iter().map(|part| part.actual_size.max(0) as usize).sum();
+
+    let mut plaintext = Vec::with_capacity(total_plain_capacity);
+
+    for part in parts {
+        if part.size == 0 {
+            continue;
+        }
+
+        let mut encrypted_part = vec![0u8; part.size];
+        tokio::io::AsyncReadExt::read_exact(&mut encrypted_stream, &mut encrypted_part)
+            .await
+            .map_err(|e| StorageError::other(format!("failed to read encrypted multipart segment {}: {}", part.number, e)))?;
+
+        let part_nonce = derive_part_nonce(base_nonce, part.number);
+        let cursor = std::io::Cursor::new(encrypted_part);
+        let mut decrypt_reader = DecryptReader::new(WarpReader::new(cursor), key_bytes, part_nonce);
+
+        tokio::io::AsyncReadExt::read_to_end(&mut decrypt_reader, &mut plaintext)
+            .await
+            .map_err(|e| StorageError::other(format!("failed to decrypt multipart segment {}: {}", part.number, e)))?;
+    }
+
+    let total_plain_size = plaintext.len() as i64;
+    let reader = Box::new(WarpReader::new(InMemoryAsyncReader::new(plaintext))) as Box<dyn Reader>;
+
+    Ok((reader, total_plain_size))
+}
+
+fn strip_managed_encryption_metadata(metadata: &mut HashMap<String, String>) {
+    const KEYS: [&str; 7] = [
+        "x-amz-server-side-encryption",
+        "x-amz-server-side-encryption-aws-kms-key-id",
+        "x-rustfs-encryption-iv",
+        "x-rustfs-encryption-tag",
+        "x-rustfs-encryption-key",
+        "x-rustfs-encryption-context",
+        "x-rustfs-encryption-original-size",
+    ];
+
+    for key in KEYS.iter() {
+        metadata.remove(*key);
+    }
+}
+
+fn is_managed_sse(algorithm: &ServerSideEncryption) -> bool {
+    matches!(algorithm.as_str(), "AES256" | "aws:kms")
+}
+
 impl FS {
     pub fn new() -> Self {
         // let store: ECStore = ECStore::new(address, endpoint_pools).await?;
@@ -367,6 +565,8 @@ impl S3 for FS {
             copy_source,
             bucket,
             key,
+            server_side_encryption: requested_sse,
+            ssekms_key_id: requested_kms_key_id,
             ..
         } = req.input.clone();
         let (src_bucket, src_key, version_id) = match copy_source {
@@ -405,6 +605,30 @@ impl S3 for FS {
             return Err(S3Error::with_message(S3ErrorCode::InternalError, "Not init".to_string()));
         };
 
+        let bucket_sse_config = metadata_sys::get_sse_config(&bucket).await.ok();
+        let effective_sse = requested_sse.or_else(|| {
+            bucket_sse_config.as_ref().and_then(|(config, _)| {
+                config.rules.first().and_then(|rule| {
+                    rule.apply_server_side_encryption_by_default
+                        .as_ref()
+                        .and_then(|sse| match sse.sse_algorithm.as_str() {
+                            "AES256" => Some(ServerSideEncryption::from_static(ServerSideEncryption::AES256)),
+                            "aws:kms" => Some(ServerSideEncryption::from_static(ServerSideEncryption::AWS_KMS)),
+                            _ => None,
+                        })
+                })
+            })
+        });
+        let mut effective_kms_key_id = requested_kms_key_id.or_else(|| {
+            bucket_sse_config.as_ref().and_then(|(config, _)| {
+                config.rules.first().and_then(|rule| {
+                    rule.apply_server_side_encryption_by_default
+                        .as_ref()
+                        .and_then(|sse| sse.kms_master_key_id.clone())
+                })
+            })
+        });
+
         let h = HeaderMap::new();
 
         let gr = store
@@ -420,6 +644,17 @@ impl S3 for FS {
 
         let mut reader: Box<dyn Reader> = Box::new(WarpReader::new(gr.stream));
 
+        if let Some((key_bytes, nonce, original_size_opt)) =
+            decrypt_managed_encryption_key(&src_bucket, &src_key, &src_info.user_defined).await?
+        {
+            reader = Box::new(DecryptReader::new(reader, key_bytes, nonce));
+            if let Some(original) = original_size_opt {
+                src_info.actual_size = original;
+            }
+        }
+
+        strip_managed_encryption_metadata(&mut src_info.user_defined);
+
         let actual_size = src_info.get_actual_size().map_err(ApiError::from)?;
 
         let mut length = actual_size;
@@ -451,9 +686,31 @@ impl S3 for FS {
                 .remove(&format!("{RESERVED_METADATA_PREFIX_LOWER}compression-size"));
         }
 
-        let hrd = HashReader::new(reader, length, actual_size, None, false).map_err(ApiError::from)?;
+        let mut reader = HashReader::new(reader, length, actual_size, None, false).map_err(ApiError::from)?;
 
-        src_info.put_object_reader = Some(PutObjReader::new(hrd));
+        if let Some(ref sse_alg) = effective_sse {
+            if is_managed_sse(sse_alg) {
+                let material =
+                    create_managed_encryption_material(&bucket, &key, sse_alg, effective_kms_key_id.clone(), actual_size).await?;
+
+                let ManagedEncryptionMaterial {
+                    data_key,
+                    headers,
+                    kms_key_id: kms_key_used,
+                } = material;
+
+                let key_bytes = data_key.plaintext_key;
+                let nonce = data_key.nonce;
+
+                src_info.user_defined.extend(headers.into_iter());
+                effective_kms_key_id = Some(kms_key_used.clone());
+
+                let encrypt_reader = EncryptReader::new(reader, key_bytes, nonce);
+                reader = HashReader::new(Box::new(encrypt_reader), -1, actual_size, None, false).map_err(ApiError::from)?;
+            }
+        }
+
+        src_info.put_object_reader = Some(PutObjReader::new(reader));
 
         // check quota
         // TODO: src metadada
@@ -479,6 +736,8 @@ impl S3 for FS {
 
         let output = CopyObjectOutput {
             copy_object_result: Some(copy_object_result),
+            server_side_encryption: effective_sse,
+            ssekms_key_id: effective_kms_key_id,
             ..Default::default()
         };
 
@@ -953,6 +1212,15 @@ impl S3 for FS {
             .map_err(ApiError::from)?;
 
         let info = reader.object_info;
+        tracing::debug!(object_size = info.size, part_count = info.parts.len(), "GET object metadata snapshot");
+        for part in &info.parts {
+            tracing::debug!(
+                part_number = part.number,
+                part_size = part.size,
+                part_actual_size = part.actual_size,
+                "GET object part details"
+            );
+        }
         let event_info = info.clone();
         let content_type = {
             if let Some(content_type) = &info.content_type {
@@ -993,6 +1261,8 @@ impl S3 for FS {
         let mut final_stream = reader.stream;
         let stored_sse_algorithm = info.user_defined.get("x-amz-server-side-encryption-customer-algorithm");
         let stored_sse_key_md5 = info.user_defined.get("x-amz-server-side-encryption-customer-key-md5");
+        let mut managed_encryption_applied = false;
+        let mut managed_original_size: Option<i64> = None;
 
         tracing::debug!(
             "GET object metadata check: stored_sse_algorithm={:?}, stored_sse_key_md5={:?}, provided_sse_key={:?}",
@@ -1096,6 +1366,26 @@ impl S3 for FS {
             }
         }
 
+        if stored_sse_algorithm.is_none() {
+            if let Some((key_bytes, nonce, original_size)) =
+                decrypt_managed_encryption_key(&bucket, &key, &info.user_defined).await?
+            {
+                if info.parts.len() > 1 {
+                    let (reader, plain_size) = decrypt_multipart_managed_stream(final_stream, &info.parts, key_bytes, nonce)
+                        .await
+                        .map_err(ApiError::from)?;
+                    final_stream = reader;
+                    managed_original_size = Some(plain_size);
+                } else {
+                    let warp_reader = WarpReader::new(final_stream);
+                    let decrypt_reader = DecryptReader::new(warp_reader, key_bytes, nonce);
+                    final_stream = Box::new(decrypt_reader);
+                    managed_original_size = original_size;
+                }
+                managed_encryption_applied = true;
+            }
+        }
+
         // For SSE-C encrypted objects, use the original size instead of encrypted size
         let response_content_length = if stored_sse_algorithm.is_some() {
             if let Some(original_size_str) = info.user_defined.get("x-amz-server-side-encryption-customer-original-size") {
@@ -1110,21 +1400,23 @@ impl S3 for FS {
                 tracing::debug!("SSE-C decryption: no original size found, using content_length {}", content_length);
                 content_length
             }
+        } else if managed_encryption_applied {
+            managed_original_size.unwrap_or(content_length)
         } else {
             content_length
         };
 
         tracing::info!("Final response_content_length: {}", response_content_length);
 
-        if stored_sse_algorithm.is_some() {
+        if stored_sse_algorithm.is_some() || managed_encryption_applied {
             let limit_reader = HardLimitReader::new(Box::new(WarpReader::new(final_stream)), response_content_length);
             final_stream = Box::new(limit_reader);
         }
 
         // For SSE-C encrypted objects, don't use bytes_stream to limit the stream
         // because DecryptReader needs to read all encrypted data to produce decrypted output
-        let body = if stored_sse_algorithm.is_some() {
+        let body = if stored_sse_algorithm.is_some() || managed_encryption_applied {
-            tracing::info!("SSE-C: Using unlimited stream for decryption");
+            tracing::info!("Managed SSE: Using unlimited stream for decryption");
             Some(StreamingBlob::wrap(ReaderStream::with_capacity(final_stream, DEFAULT_READ_BUFFER_SIZE)))
         } else {
             Some(StreamingBlob::wrap(bytes_stream(
@@ -1273,7 +1565,17 @@ impl S3 for FS {
 
         let content_length = info.get_actual_size().map_err(ApiError::from)?;
 
-        let metadata = info.user_defined;
+        let metadata_map = info.user_defined.clone();
+        let server_side_encryption = metadata_map
+            .get("x-amz-server-side-encryption")
+            .map(|v| ServerSideEncryption::from(v.clone()));
+        let sse_customer_algorithm = metadata_map
+            .get("x-amz-server-side-encryption-customer-algorithm")
+            .map(|v| SSECustomerAlgorithm::from(v.clone()));
+        let sse_customer_key_md5 = metadata_map.get("x-amz-server-side-encryption-customer-key-md5").cloned();
+        let ssekms_key_id = metadata_map.get("x-amz-server-side-encryption-aws-kms-key-id").cloned();
+
+        let metadata = metadata_map;
 
         let output = HeadObjectOutput {
             content_length: Some(content_length),
@@ -1282,6 +1584,10 @@ impl S3 for FS {
             e_tag: info.etag,
             metadata: Some(metadata),
             version_id: info.version_id.map(|v| v.to_string()),
+            server_side_encryption,
+            sse_customer_algorithm,
+            sse_customer_key_md5,
+            ssekms_key_id,
             // metadata: object_metadata,
             ..Default::default()
         };
@@ -1630,8 +1936,7 @@ impl S3 for FS {
         });
         tracing::debug!("TDD: effective_sse={:?} (original={:?})", effective_sse, original_sse);
 
-        let _original_kms_key_id = ssekms_key_id.clone();
+        let mut effective_kms_key_id = ssekms_key_id.or_else(|| {
-        let effective_kms_key_id = ssekms_key_id.or_else(|| {
             bucket_sse_config.as_ref().and_then(|(config, _timestamp)| {
                 config.rules.first().and_then(|rule| {
                     rule.apply_server_side_encryption_by_default
@@ -1650,9 +1955,6 @@ impl S3 for FS {
         }
 
         // TDD: Store effective SSE information in metadata for GET responses
-        if let Some(sse) = &effective_sse {
-            metadata.insert("x-amz-server-side-encryption".to_string(), sse.as_str().to_string());
-        }
         if let Some(sse_alg) = &sse_customer_algorithm {
             metadata.insert(
                 "x-amz-server-side-encryption-customer-algorithm".to_string(),
@@ -1662,6 +1964,10 @@ impl S3 for FS {
         if let Some(sse_md5) = &sse_customer_key_md5 {
             metadata.insert("x-amz-server-side-encryption-customer-key-md5".to_string(), sse_md5.clone());
         }
+        if let Some(sse) = &effective_sse {
+            metadata.insert("x-amz-server-side-encryption".to_string(), sse.as_str().to_string());
+        }
+
         if let Some(kms_key_id) = &effective_kms_key_id {
             metadata.insert("x-amz-server-side-encryption-aws-kms-key-id".to_string(), kms_key_id.clone());
         }
@@ -1728,6 +2034,32 @@ impl S3 for FS {
             reader = HashReader::new(Box::new(encrypt_reader), -1, actual_size, None, false).map_err(ApiError::from)?;
         }
 
+        // Apply managed SSE (SSE-S3 or SSE-KMS) when requested
+        if sse_customer_algorithm.is_none() {
+            if let Some(sse_alg) = &effective_sse {
+                if is_managed_sse(sse_alg) {
+                    let material =
+                        create_managed_encryption_material(&bucket, &key, sse_alg, effective_kms_key_id.clone(), actual_size)
+                            .await?;
+
+                    let ManagedEncryptionMaterial {
+                        data_key,
+                        headers,
+                        kms_key_id: kms_key_used,
+                    } = material;
+
+                    let key_bytes = data_key.plaintext_key;
+                    let nonce = data_key.nonce;
+
+                    metadata.extend(headers);
+                    effective_kms_key_id = Some(kms_key_used.clone());
+
+                    let encrypt_reader = EncryptReader::new(reader, key_bytes, nonce);
+                    reader = HashReader::new(Box::new(encrypt_reader), -1, actual_size, None, false).map_err(ApiError::from)?;
+                }
+            }
+        }
+
         let mut reader = PutObjReader::new(reader);
 
         let mt = metadata.clone();
@@ -1860,7 +2192,7 @@ impl S3 for FS {
         tracing::debug!("TDD: effective_sse for multipart={:?} (original={:?})", effective_sse, original_sse);
 
         let _original_kms_key_id = ssekms_key_id.clone();
-        let effective_kms_key_id = ssekms_key_id.or_else(|| {
+        let mut effective_kms_key_id = ssekms_key_id.or_else(|| {
             bucket_sse_config.as_ref().and_then(|(config, _timestamp)| {
                 config.rules.first().and_then(|rule| {
                     rule.apply_server_side_encryption_by_default
@@ -1871,9 +2203,6 @@ impl S3 for FS {
         });
 
         // Store effective SSE information in metadata for multipart upload
-        if let Some(sse) = &effective_sse {
-            metadata.insert("x-amz-server-side-encryption".to_string(), sse.as_str().to_string());
-        }
         if let Some(sse_alg) = &sse_customer_algorithm {
             metadata.insert(
                 "x-amz-server-side-encryption-customer-algorithm".to_string(),
@@ -1883,6 +2212,24 @@ impl S3 for FS {
         if let Some(sse_md5) = &sse_customer_key_md5 {
             metadata.insert("x-amz-server-side-encryption-customer-key-md5".to_string(), sse_md5.clone());
         }
+
+        if let Some(sse) = &effective_sse {
+            if is_managed_sse(sse) {
+                let material = create_managed_encryption_material(&bucket, &key, sse, effective_kms_key_id.clone(), 0).await?;
+
+                let ManagedEncryptionMaterial {
+                    data_key: _,
+                    headers,
+                    kms_key_id: kms_key_used,
+                } = material;
+
+                metadata.extend(headers.into_iter());
+                effective_kms_key_id = Some(kms_key_used.clone());
+            } else {
+                metadata.insert("x-amz-server-side-encryption".to_string(), sse.as_str().to_string());
+            }
+        }
+
         if let Some(kms_key_id) = &effective_kms_key_id {
             metadata.insert("x-amz-server-side-encryption-aws-kms-key-id".to_string(), kms_key_id.clone());
         }
@@ -1961,41 +2308,84 @@ impl S3 for FS {
 
         // let upload_id =
 
-        let body = body.ok_or_else(|| s3_error!(IncompleteBody))?;
+        let mut size = content_length;
-        let size = match content_length {
+        let mut body_stream = body.ok_or_else(|| s3_error!(IncompleteBody))?;
-            Some(c) => c,
+
-            None => {
+        if size.is_none() {
-                if let Some(val) = req.headers.get(AMZ_DECODED_CONTENT_LENGTH) {
+            if let Some(val) = req.headers.get(AMZ_DECODED_CONTENT_LENGTH) {
-                    match atoi::atoi::<i64>(val.as_bytes()) {
+                if let Some(x) = atoi::atoi::<i64>(val.as_bytes()) {
-                        Some(x) => x,
+                    size = Some(x);
-                        None => return Err(s3_error!(UnexpectedContent)),
-                    }
-                } else {
-                    return Err(s3_error!(UnexpectedContent));
                 }
             }
-        };
 
-        let body = StreamReader::new(body.map(|f| f.map_err(|e| std::io::Error::other(e.to_string()))));
+            if size.is_none() {
+                let mut total = 0i64;
+                let mut buffer = bytes::BytesMut::new();
+                while let Some(chunk) = body_stream.next().await {
+                    let chunk = chunk.map_err(|e| ApiError::from(StorageError::other(e.to_string())))?;
+                    total += chunk.len() as i64;
+                    buffer.extend_from_slice(&chunk);
+                }
 
-        // mc cp step 4
+                if total <= 0 {
+                    return Err(s3_error!(UnexpectedContent));
+                }
 
-        let opts = ObjectOptions::default();
+                size = Some(total);
+                let combined = buffer.freeze();
+                let stream = futures::stream::once(async move { Ok::<Bytes, std::io::Error>(combined) });
+                body_stream = StreamingBlob::wrap(stream);
+            }
+        }
 
+        // Get multipart info early to check if managed encryption will be applied
         let Some(store) = new_object_layer_fn() else {
             return Err(S3Error::with_message(S3ErrorCode::InternalError, "Not init".to_string()));
         };
 
+        let opts = ObjectOptions::default();
         let fi = store
             .get_multipart_info(&bucket, &key, &upload_id, &opts)
             .await
             .map_err(ApiError::from)?;
 
+        // Check if managed encryption will be applied
+        let will_apply_managed_encryption = decrypt_managed_encryption_key(&bucket, &key, &fi.user_defined)
+            .await?
+            .is_some();
+
+        // If managed encryption will be applied and we have Content-Length, buffer the entire body
+        // This is necessary because encryption changes the data size, which causes Content-Length mismatches
+        if will_apply_managed_encryption && size.is_some() {
+            let mut total = 0i64;
+            let mut buffer = bytes::BytesMut::new();
+            while let Some(chunk) = body_stream.next().await {
+                let chunk = chunk.map_err(|e| ApiError::from(StorageError::other(e.to_string())))?;
+                total += chunk.len() as i64;
+                buffer.extend_from_slice(&chunk);
+            }
+
+            if total <= 0 {
+                return Err(s3_error!(UnexpectedContent));
+            }
+
+            size = Some(total);
+            let combined = buffer.freeze();
+            let stream = futures::stream::once(async move { Ok::<Bytes, std::io::Error>(combined) });
+            body_stream = StreamingBlob::wrap(stream);
+        }
+
+        let mut size = size.ok_or_else(|| s3_error!(UnexpectedContent))?;
+
+        let body = StreamReader::new(body_stream.map(|f| f.map_err(|e| std::io::Error::other(e.to_string()))));
+
+        // mc cp step 4
+
         let is_compressible = fi
             .user_defined
             .contains_key(format!("{RESERVED_METADATA_PREFIX_LOWER}compression").as_str());
 
-        let reader: Box<dyn Reader> = Box::new(WarpReader::new(body));
+        let mut reader: Box<dyn Reader> = Box::new(WarpReader::new(body));
 
         let actual_size = size;
 
@@ -2039,16 +2429,22 @@ impl S3 for FS {
         }
         */
 
-        // TODO: md5 check
+        if is_compressible {
-        let reader = if is_compressible {
             let hrd = HashReader::new(reader, size, actual_size, None, false).map_err(ApiError::from)?;
             let compress_reader = CompressReader::new(hrd, CompressionAlgorithm::default());
-            Box::new(HashReader::new(Box::new(compress_reader), -1, actual_size, None, false).map_err(ApiError::from)?)
+            reader = Box::new(compress_reader);
-        } else {
+            size = -1;
-            Box::new(HashReader::new(reader, size, actual_size, None, false).map_err(ApiError::from)?)
+        }
-        };
 
-        let mut reader = PutObjReader::new(*reader);
+        let mut reader = HashReader::new(reader, size, actual_size, None, false).map_err(ApiError::from)?;
+
+        if let Some((key_bytes, base_nonce, _)) = decrypt_managed_encryption_key(&bucket, &key, &fi.user_defined).await? {
+            let part_nonce = derive_part_nonce(base_nonce, part_id);
+            let encrypt_reader = EncryptReader::new(reader, key_bytes, part_nonce);
+            reader = HashReader::new(Box::new(encrypt_reader), -1, actual_size, None, false).map_err(ApiError::from)?;
+        }
+
+        let mut reader = PutObjReader::new(reader);
 
         let info = store
             .put_object_part(&bucket, &key, &upload_id, part_id, &mut reader, &opts)
@@ -2126,7 +2522,7 @@ impl S3 for FS {
             .await
             .map_err(ApiError::from)?;
 
-        let src_info = src_reader.object_info;
+        let mut src_info = src_reader.object_info;
 
         // Validate copy conditions (simplified for now)
         if let Some(if_match) = copy_source_if_match {
@@ -2200,6 +2596,15 @@ impl S3 for FS {
 
         let mut reader: Box<dyn Reader> = Box::new(WarpReader::new(src_stream));
 
+        if let Some((key_bytes, nonce, original_size_opt)) =
+            decrypt_managed_encryption_key(&src_bucket, &src_key, &src_info.user_defined).await?
+        {
+            reader = Box::new(DecryptReader::new(reader, key_bytes, nonce));
+            if let Some(original) = original_size_opt {
+                src_info.actual_size = original;
+            }
+        }
+
         let actual_size = length;
         let mut size = length;
 
@@ -2209,8 +2614,14 @@ impl S3 for FS {
             size = -1;
         }
 
-        // TODO: md5 check
+        let mut reader = HashReader::new(reader, size, actual_size, None, false).map_err(ApiError::from)?;
-        let reader = HashReader::new(reader, size, actual_size, None, false).map_err(ApiError::from)?;
+
+        if let Some((key_bytes, base_nonce, _)) = decrypt_managed_encryption_key(&bucket, &key, &mp_info.user_defined).await? {
+            let part_nonce = derive_part_nonce(base_nonce, part_id);
+            let encrypt_reader = EncryptReader::new(reader, key_bytes, part_nonce);
+            reader = HashReader::new(Box::new(encrypt_reader), -1, actual_size, None, false).map_err(ApiError::from)?;
+        }
+
         let mut reader = PutObjReader::new(reader);
 
         // Set up destination options (inherit from multipart upload)