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+ "windows_i686_gnu",
+ "windows_i686_msvc",
+ "windows_x86_64_gnu",
+ "windows_x86_64_msvc",
+]
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+ "zstd-safe",
+]
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+ "libc",
+ "zstd-sys",
+]
+
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+dependencies = [
+ "cc",
+ "libc",
+]
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..c6ceb8a
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,24 @@
+[package]
+name = "mailrage"
+version = "0.0.1"
+authors = ["Alex Auvolat <alex@adnab.me>"]
+edition = "2021"
+license = "AGPL-3.0"
+description = "Encrypted mail storage over Garage"
+
+[dependencies]
+anyhow = "1.0.28"
+hex = "0.4"
+im = "15"
+rusoto_core = "0.48.0"
+rusoto_credential = "0.48.0"
+rusoto_s3 = "0.48"
+rusoto_signature = "0.48.0"
+serde = "1.0.137"
+rand = "0.8.5"
+rmp-serde = "0.15"
+sodiumoxide = "0.2"
+tokio = "1.17.0"
+zstd = { version = "0.9", default-features = false }
+
+k2v-client = { git = "https://git.deuxfleurs.fr/trinity-1686a/garage.git", branch = "k2v-client" }
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..a09b412
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,2 @@
+all:
+	clear; cargo build --all-features
diff --git a/src/bayou.rs b/src/bayou.rs
new file mode 100644
index 0000000..8fc711e
--- /dev/null
+++ b/src/bayou.rs
@@ -0,0 +1,123 @@
+use std::time::Duration;
+
+use anyhow::Result;
+use rand::prelude::*;
+use serde::{Deserialize, Serialize};
+
+use k2v_client::K2vClient;
+use rusoto_core::HttpClient;
+use rusoto_credential::{AwsCredentials, StaticProvider};
+use rusoto_s3::S3Client;
+use rusoto_signature::Region;
+
+use crate::cryptoblob::Key;
+use crate::time::now_msec;
+
+pub trait BayouState:
+    Default + Clone + Serialize + for<'de> Deserialize<'de> + Send + Sync + 'static
+{
+    type Op: Clone + Serialize + for<'de> Deserialize<'de> + Send + Sync + 'static;
+
+    fn apply(&self, op: &Self::Op) -> Self;
+}
+
+pub struct Bayou<S: BayouState> {
+    bucket: String,
+    path: String,
+    key: Key,
+
+    k2v: K2vClient,
+    s3: S3Client,
+
+    checkpoint: (Timestamp, S),
+    history: Vec<(Timestamp, S::Op, Option<S>)>,
+}
+
+impl<S: BayouState> Bayou<S> {
+    pub fn new(
+        creds: AwsCredentials,
+        k2v_region: Region,
+        s3_region: Region,
+        bucket: String,
+        path: String,
+        key: Key,
+    ) -> Result<Self> {
+        let k2v_client = K2vClient::new(k2v_region, bucket.clone(), creds.clone(), None)?;
+        let static_creds = StaticProvider::new(
+            creds.aws_access_key_id().to_string(),
+            creds.aws_secret_access_key().to_string(),
+            creds.token().clone(),
+            None,
+        );
+        let s3_client = S3Client::new_with(HttpClient::new()?, static_creds, s3_region);
+
+        Ok(Self {
+            bucket,
+            path,
+            key,
+            k2v: k2v_client,
+            s3: s3_client,
+            checkpoint: (Timestamp::zero(), S::default()),
+            history: vec![],
+        })
+    }
+
+    pub async fn sync(&mut self) -> Result<()> {
+        // 1. List checkpoints
+        // 2. Load last checkpoint
+        // 3. List all operations starting from checkpoint
+        // 4. Check that first operation has same timestamp as checkpoint (if not zero)
+        // 5. Apply all operations in order
+        unimplemented!()
+    }
+
+    pub fn state(&self) -> &S {
+        unimplemented!()
+    }
+}
+
+#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
+pub struct Timestamp {
+    pub msec: u64,
+    pub rand: u64,
+}
+
+impl Timestamp {
+    pub fn now() -> Self {
+        let mut rng = thread_rng();
+        Self {
+            msec: now_msec(),
+            rand: rng.gen::<u64>(),
+        }
+    }
+
+    pub fn after(other: &Self) -> Self {
+        let mut rng = thread_rng();
+        Self {
+            msec: std::cmp::max(now_msec(), other.msec + 1),
+            rand: rng.gen::<u64>(),
+        }
+    }
+
+    pub fn zero() -> Self {
+        Self { msec: 0, rand: 0 }
+    }
+
+    pub fn serialize(&self) -> String {
+        let mut bytes = [0u8; 16];
+        bytes[0..8].copy_from_slice(&u64::to_be_bytes(self.msec));
+        bytes[8..16].copy_from_slice(&u64::to_be_bytes(self.rand));
+        hex::encode(&bytes)
+    }
+
+    pub fn parse(v: &str) -> Option<Self> {
+        let bytes = hex::decode(v).ok()?;
+        if bytes.len() != 16 {
+            return None;
+        }
+        Some(Self {
+            msec: u64::from_be_bytes(bytes[0..8].try_into().unwrap()),
+            rand: u64::from_be_bytes(bytes[8..16].try_into().unwrap()),
+        })
+    }
+}
diff --git a/src/cryptoblob.rs b/src/cryptoblob.rs
new file mode 100644
index 0000000..6e51dbb
--- /dev/null
+++ b/src/cryptoblob.rs
@@ -0,0 +1,58 @@
+//! Helper functions for secret-key encrypted blobs
+//! that contain Zstd encrypted data
+
+use anyhow::{anyhow, Result};
+use serde::{Deserialize, Serialize};
+use zstd::stream::{decode_all as zstd_decode, encode_all as zstd_encode};
+
+use sodiumoxide::crypto::secretbox::xsalsa20poly1305::{self, gen_nonce, Nonce, NONCEBYTES};
+pub use sodiumoxide::crypto::secretbox::xsalsa20poly1305::{gen_key, Key, KEYBYTES};
+
+pub fn open(cryptoblob: &[u8], key: &Key) -> Result<Vec<u8>> {
+    if cryptoblob.len() < NONCEBYTES {
+        return Err(anyhow!("Cyphertext too short"));
+    }
+
+    // Decrypt -> get Zstd data
+    let nonce = Nonce::from_slice(&cryptoblob[..NONCEBYTES]).unwrap();
+    let zstdblob = xsalsa20poly1305::open(&cryptoblob[NONCEBYTES..], &nonce, key)
+        .map_err(|_| anyhow!("Could not decrypt blob"))?;
+
+    // Decompress zstd data
+    let mut reader = &zstdblob[..];
+    let data = zstd_decode(&mut reader)?;
+
+    Ok(data)
+}
+
+pub fn seal(plainblob: &[u8], key: &Key) -> Result<Vec<u8>> {
+    // Compress data using zstd
+    let mut reader = &plainblob[..];
+    let zstdblob = zstd_encode(&mut reader, 0)?;
+
+    // Encrypt
+    let nonce = gen_nonce();
+    let cryptoblob = xsalsa20poly1305::seal(&zstdblob, &nonce, key);
+
+    let mut res = Vec::with_capacity(NONCEBYTES + cryptoblob.len());
+    res.extend(nonce.as_ref());
+    res.extend(cryptoblob);
+
+    Ok(res)
+}
+
+pub fn open_deserialize<T: for<'de> Deserialize<'de>>(cryptoblob: &[u8], key: &Key) -> Result<T> {
+    let blob = open(cryptoblob, key)?;
+
+    Ok(rmp_serde::decode::from_read_ref::<_, T>(&blob)?)
+}
+
+pub fn seal_serialize<T: Serialize>(obj: T, key: &Key) -> Result<Vec<u8>> {
+    let mut wr = Vec::with_capacity(128);
+    let mut se = rmp_serde::Serializer::new(&mut wr)
+        .with_struct_map()
+        .with_string_variants();
+    obj.serialize(&mut se)?;
+
+    Ok(seal(&wr, key)?)
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..2b17e4c
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,47 @@
+use anyhow::Result;
+
+use rusoto_credential::{EnvironmentProvider, ProvideAwsCredentials};
+use rusoto_signature::Region;
+
+mod bayou;
+mod cryptoblob;
+mod time;
+mod uidindex;
+
+use bayou::Bayou;
+use cryptoblob::Key;
+use uidindex::{UidIndex, UidIndexOp};
+
+#[tokio::main]
+async fn main() {
+    do_stuff().await.expect("Something failed");
+}
+
+async fn do_stuff() -> Result<()> {
+    let creds = EnvironmentProvider::default().credentials().await.unwrap();
+
+    let k2v_region = Region::Custom {
+        name: "garage-staging".to_owned(),
+        endpoint: "https://k2v-staging.home.adnab.me".to_owned(),
+    };
+
+    let s3_region = Region::Custom {
+        name: "garage-staging".to_owned(),
+        endpoint: "https://garage-staging.home.adnab.me".to_owned(),
+    };
+
+    let key = Key::from_slice(&[0u8; 32]).unwrap();
+
+    let mut mail_index = Bayou::<UidIndex>::new(
+        creds,
+        k2v_region,
+        s3_region,
+        "alex".into(),
+        "TestMailbox".into(),
+        key,
+    )?;
+
+    mail_index.sync().await?;
+
+    Ok(())
+}
diff --git a/src/time.rs b/src/time.rs
new file mode 100644
index 0000000..d34ee22
--- /dev/null
+++ b/src/time.rs
@@ -0,0 +1,9 @@
+use std::time::{SystemTime, UNIX_EPOCH};
+
+/// Returns milliseconds since UNIX Epoch
+pub fn now_msec() -> u64 {
+    SystemTime::now()
+        .duration_since(UNIX_EPOCH)
+        .expect("Fix your clock :o")
+        .as_millis() as u64
+}
diff --git a/src/uidindex.rs b/src/uidindex.rs
new file mode 100644
index 0000000..7c5500f
--- /dev/null
+++ b/src/uidindex.rs
@@ -0,0 +1,168 @@
+use im::OrdMap;
+use serde::{de::Error, Deserialize, Deserializer, Serialize, Serializer};
+
+use crate::bayou::*;
+
+type ImapUid = u32;
+type ImapUidvalidity = u32;
+
+/// A Mail UUID is composed of two components:
+/// - a process identifier, 128 bits
+/// - a sequence number, 64 bits
+#[derive(Clone, Copy, PartialOrd, Ord, PartialEq, Eq)]
+pub struct MailUuid(pub [u8; 24]);
+
+#[derive(Clone)]
+pub struct UidIndex {
+    mail_uid: OrdMap<MailUuid, ImapUid>,
+    mail_flags: OrdMap<MailUuid, Vec<String>>,
+
+    mails_by_uid: OrdMap<ImapUid, MailUuid>,
+
+    uidvalidity: ImapUidvalidity,
+    uidnext: ImapUid,
+    internalseq: ImapUid,
+}
+
+#[derive(Clone, Serialize, Deserialize)]
+pub enum UidIndexOp {
+    MailAdd(MailUuid, ImapUid, Vec<String>),
+    MailDel(MailUuid),
+}
+
+impl Default for UidIndex {
+    fn default() -> Self {
+        Self {
+            mail_flags: OrdMap::new(),
+            mail_uid: OrdMap::new(),
+            mails_by_uid: OrdMap::new(),
+            uidvalidity: 1,
+            uidnext: 1,
+            internalseq: 1,
+        }
+    }
+}
+
+impl BayouState for UidIndex {
+    type Op = UidIndexOp;
+
+    fn apply(&self, op: &UidIndexOp) -> Self {
+        let mut new = self.clone();
+        match op {
+            UidIndexOp::MailAdd(uuid, uid, flags) => {
+                if *uid < new.internalseq {
+                    new.uidvalidity += new.internalseq - *uid;
+                }
+                let new_uid = new.internalseq;
+
+                if let Some(prev_uid) = new.mail_uid.get(uuid) {
+                    new.mails_by_uid.remove(prev_uid);
+                } else {
+                    new.mail_flags.insert(*uuid, flags.clone());
+                }
+                new.mails_by_uid.insert(new_uid, *uuid);
+                new.mail_uid.insert(*uuid, new_uid);
+
+                new.internalseq += 1;
+                new.uidnext = new.internalseq;
+            }
+            UidIndexOp::MailDel(uuid) => {
+                if let Some(uid) = new.mail_uid.get(uuid) {
+                    new.mails_by_uid.remove(uid);
+                    new.mail_uid.remove(uuid);
+                    new.mail_flags.remove(uuid);
+                }
+                new.internalseq += 1;
+            }
+        }
+        new
+    }
+}
+
+// ---- CUSTOM SERIALIZATION AND DESERIALIZATION ----
+
+#[derive(Serialize, Deserialize)]
+struct UidIndexSerializedRepr {
+    mails: Vec<(ImapUid, MailUuid, Vec<String>)>,
+    uidvalidity: ImapUidvalidity,
+    uidnext: ImapUid,
+    internalseq: ImapUid,
+}
+
+impl<'de> Deserialize<'de> for UidIndex {
+    fn deserialize<D>(d: D) -> Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        let val: UidIndexSerializedRepr = UidIndexSerializedRepr::deserialize(d)?;
+
+        let mut uidindex = UidIndex {
+            mail_flags: OrdMap::new(),
+            mail_uid: OrdMap::new(),
+            mails_by_uid: OrdMap::new(),
+            uidvalidity: val.uidvalidity,
+            uidnext: val.uidnext,
+            internalseq: val.internalseq,
+        };
+
+        for (uid, uuid, flags) in val.mails {
+            uidindex.mail_flags.insert(uuid, flags);
+            uidindex.mail_uid.insert(uuid, uid);
+            uidindex.mails_by_uid.insert(uid, uuid);
+        }
+
+        Ok(uidindex)
+    }
+}
+
+impl Serialize for UidIndex {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        let mut mails = vec![];
+        for (uid, uuid) in self.mails_by_uid.iter() {
+            mails.push((
+                *uid,
+                *uuid,
+                self.mail_flags.get(uuid).cloned().unwrap_or_default(),
+            ));
+        }
+
+        let val = UidIndexSerializedRepr {
+            mails,
+            uidvalidity: self.uidvalidity,
+            uidnext: self.uidnext,
+            internalseq: self.internalseq,
+        };
+
+        val.serialize(serializer)
+    }
+}
+
+impl<'de> Deserialize<'de> for MailUuid {
+    fn deserialize<D>(d: D) -> Result<Self, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        let v = String::deserialize(d)?;
+        let bytes = hex::decode(v).map_err(|_| D::Error::custom("invalid hex"))?;
+
+        if bytes.len() != 24 {
+            return Err(D::Error::custom("bad length"));
+        }
+
+        let mut tmp = [0u8; 24];
+        tmp[..].copy_from_slice(&bytes);
+        Ok(Self(tmp))
+    }
+}
+
+impl Serialize for MailUuid {
+    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
+    where
+        S: Serializer,
+    {
+        serializer.serialize_str(&hex::encode(self.0))
+    }
+}