diff --git a/.github/dependabot.yml b/.github/dependabot.yml
new file mode 100644
index 0000000..fca0c6a
--- /dev/null
+++ b/.github/dependabot.yml
@@ -0,0 +1,11 @@
+version: 2
+updates:
+  - package-ecosystem: cargo
+    directory: /
+    schedule:
+      interval: weekly
+    open-pull-requests-limit: 10
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: weekly
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..785badf
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,46 @@
+name: CI
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+env:
+  CARGO_TERM_COLOR: always
+  RUSTFLAGS: -Dwarnings
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+      - uses: dtolnay/rust-toolchain@stable
+      - uses: Swatinem/rust-cache@v2
+      - run: cargo build --all-features
+
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+      - uses: dtolnay/rust-toolchain@stable
+      - uses: Swatinem/rust-cache@v2
+      - run: cargo test --all-features
+
+  clippy:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+      - uses: dtolnay/rust-toolchain@stable
+        with:
+          components: clippy
+      - uses: Swatinem/rust-cache@v2
+      - run: cargo clippy --all-features --all-targets -- -D warnings
+
+  fmt:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+      - uses: dtolnay/rust-toolchain@stable
+        with:
+          components: rustfmt
+      - run: cargo fmt --all -- --check
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
new file mode 100644
index 0000000..1e41e1e
--- /dev/null
+++ b/.github/workflows/release.yml
@@ -0,0 +1,24 @@
+name: Release
+on:
+  push:
+    tags: ["v*"]
+
+permissions:
+  contents: write
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+      - uses: dtolnay/rust-toolchain@stable
+      - run: cargo publish --token ${{ secrets.CRATES_IO_TOKEN }}
+
+  github-release:
+    runs-on: ubuntu-latest
+    needs: publish
+    steps:
+      - uses: actions/checkout@v6
+      - uses: softprops/action-gh-release@v2
+        with:
+          generate_release_notes: true
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..b1c081e
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,7 @@
+/target
+Cargo.lock
+*.swp
+*.swo
+.DS_Store
+donors/
+.refs/
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..42b7c6d
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,37 @@
+[package]
+name = "xml-sec"
+version = "0.1.0"
+edition = "2021"
+rust-version = "1.75"
+license = "Apache-2.0"
+description = "Pure Rust XML Security: XMLDSig, XMLEnc, C14N. Drop-in replacement for libxmlsec1."
+repository = "https://github.com/structured-world/xml-sec"
+homepage = "https://github.com/structured-world/xml-sec"
+documentation = "https://docs.rs/xml-sec"
+keywords = ["xml", "xmldsig", "xmlenc", "c14n", "saml"]
+categories = ["cryptography", "web-programming", "authentication"]
+readme = "README.md"
+
+[dependencies]
+# XML parsing
+roxmltree = "0.20"
+
+# Crypto
+ring = "0.17"
+
+# X.509 certificates
+x509-parser = "0.16"
+der = "0.7"
+
+# Error handling
+thiserror = "2"
+
+[dev-dependencies]
+# W3C test vectors
+base64 = "0.22"
+
+[features]
+default = ["xmldsig", "c14n"]
+xmldsig = []           # XML Digital Signatures (sign + verify)
+xmlenc = []            # XML Encryption (encrypt + decrypt)
+c14n = []              # XML Canonicalization (inclusive + exclusive)
diff --git a/README.md b/README.md
index 9760148..c7b474b 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,39 @@
 # xml-sec
-Pure Rust XML Security: XMLDSig, XMLEnc, C14N. Drop-in replacement for libxmlsec1.
+
+Pure Rust XML Security library. Drop-in replacement for libxmlsec1.
+
+**No C dependencies. No cmake. No system libraries. Just `cargo add xml-sec`.**
+
+## Features
+
+- **C14N** — XML Canonicalization (inclusive + exclusive, W3C compliant)
+- **XMLDSig** — XML Digital Signatures (sign + verify, enveloped/enveloping/detached)
+- **XMLEnc** — XML Encryption (symmetric + asymmetric)
+- **X.509** — Certificate-based key extraction and validation
+
+## Why?
+
+Every SAML, SOAP, and WS-Security implementation depends on libxmlsec1 — a C library that:
+- Requires cmake + libxml2 + OpenSSL/NSS/GnuTLS to build
+- Breaks on Alpine/musl static linking
+- Has decades of CVEs in XML parsing and signature validation
+- Cannot cross-compile easily
+
+`xml-sec` is a ground-up Rust rewrite using `roxmltree` + `ring` + `x509-parser`. Single `cargo build`, works everywhere Rust works.
+
+## Status
+
+**Pre-release.** API is unstable. Not ready for production use.
+
+## Specifications
+
+| Spec | Status |
+|------|--------|
+| [Canonical XML 1.0](https://www.w3.org/TR/xml-c14n/) | Planned |
+| [Exclusive C14N](https://www.w3.org/TR/xml-exc-c14n/) | Planned |
+| [XMLDSig](https://www.w3.org/TR/xmldsig-core1/) | Planned |
+| [XMLEnc](https://www.w3.org/TR/xmlenc-core1/) | Planned |
+
+## License
+
+Apache-2.0
diff --git a/pr b/pr
new file mode 100644
index 0000000..b800827
--- /dev/null
+++ b/pr
@@ -0,0 +1,75 @@
+
+---
+Промпт 1 — Source Tree Inventory
+
+Мне нужно проанализировать кодовые базы-доноры для проекта xml-sec (Pure Rust XML Security).
+
+### Агент 1: xmlsec1 (~/projects/sw/xml-sec/donors/xmlsec/)
+
+Ты анализируешь исходный код xmlsec1 (C, XML Security Library) для справочного каталога.
+
+ЗАДАЧА: Создать структурированный каталог исходников.
+
+ПРАВИЛА ФИЛЬТРАЦИИ:
+- ВКЛЮЧАТЬ: .c/.h файлы из: src/ (core), src/openssl/ (crypto backend), include/xmlsec/
+- ВКЛЮЧАТЬ: tests/aleksey/ (reference test vectors — W3C compliance)
+- ИСКЛЮЧАТЬ: src/nss/, src/gnutls/, src/mscrypto/, src/mscng/ (alternative crypto backends)
+- ИСКЛЮЧАТЬ: win32/, docs/, scripts/, m4/
+- ИСКЛЮЧАТЬ: файлы < 20 строк
+
+ФОРМАТ ВЫВОДА — файл ~/projects/sw/xml-sec/.refs/xmlsec-tree.md
+
+ПРОЦЕДУРА:
+1. cd ~/projects/sw/xml-sec/donors/xmlsec/ && git rev-parse HEAD
+2. Focus: src/c14n.c (canonicalization), src/xmldsig.c (signatures), src/xmlenc.c (encryption),
+   src/transforms.c (transform chain), src/keys.c (key management), src/x509.c (certificates)
+3. Для каждого файла: read first 100 lines → describe struct/function signatures
+
+### Агент 2: samael (~/projects/sw/xml-sec/donors/samael/)
+
+Ты анализируешь исходный код samael (Rust, SAML2 library) — reference для XML signature handling.
+
+ПРАВИЛА ФИЛЬТРАЦИИ:
+- ВКЛЮЧАТЬ: src/ (all .rs files)
+- ИСКЛЮЧАТЬ: tests/, examples/
+
+Focus: как samael делает XML signature verification, где вызывает C xmlsec1, какие Rust structures определены.
+
+ФОРМАТ ВЫВОДА — файл ~/projects/sw/xml-sec/.refs/samael-tree.md
+
+---
+
+Промпт 2 — Feature-Targeted Deep Analysis
+
+FEATURE-БЛОКИ (8 штук):
+
+1. C14N Inclusive — xmlsec1 src/c14n.c, алгоритм каноникализации, namespace processing, attribute sorting
+2. C14N Exclusive — xmlsec1 src/c14n.c (exclusive mode), namespace rendering rules
+3. XMLDSig Verify — xmlsec1 src/xmldsig.c, verification pipeline: Reference → DigestValue → SignatureValue
+4. XMLDSig Sign — xmlsec1 src/xmldsig.c, signing pipeline: transforms → digest → sign
+5. Transform Chain — xmlsec1 src/transforms.c, enveloped-signature transform, XPath filter
+6. XMLEnc — xmlsec1 src/xmlenc.c, symmetric/asymmetric encryption, key wrapping
+7. Key Management — xmlsec1 src/keys.c, src/x509.c, KeyInfo element processing
+8. samael Integration — samael src/xmlsec.rs, how Rust SAML calls xmlsec1 FFI, what we replace
+
+---
+
+Промпт 3 — Architecture Documents
+
+Создать ~/projects/sw/xml-sec/arch/ с документами:
+- arch/c14n.md — Canonicalization design
+- arch/xmldsig.md — Digital Signatures design
+- arch/xmlenc.md — Encryption design
+- arch/transforms.md — Transform pipeline design
+- arch/keys.md — Key management design
+- arch/ROADMAP.md — Phased implementation plan
+- arch/DECISIONS.md — ADR log
+
+---
+
+Промпт 4 — Roadmap
+
+Phase 1 (3 мес): C14N + XMLDSig verify-only → samael can use xml-sec for SAML assertion validation
+Phase 2 (3 мес): XMLDSig sign + KeyInfo → full SAML IdP support
+Phase 3 (3 мес): XMLEnc + full transform pipeline
+Phase 4 (3 мес): W3C conformance test suite, production hardening, 1.0 release
diff --git a/src/c14n/mod.rs b/src/c14n/mod.rs
new file mode 100644
index 0000000..4a65e69
--- /dev/null
+++ b/src/c14n/mod.rs
@@ -0,0 +1,23 @@
+//! XML Canonicalization (C14N).
+//!
+//! Implements:
+//! - [Canonical XML 1.0](https://www.w3.org/TR/xml-c14n/)
+//! - [Canonical XML 1.1](https://www.w3.org/TR/xml-c14n11/)
+//! - [Exclusive XML Canonicalization](https://www.w3.org/TR/xml-exc-c14n/)
+
+/// Canonicalization algorithm selection.
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum C14nAlgorithm {
+    /// Canonical XML 1.0 (with comments).
+    Inclusive10WithComments,
+    /// Canonical XML 1.0 (without comments).
+    Inclusive10,
+    /// Canonical XML 1.1 (with comments).
+    Inclusive11WithComments,
+    /// Canonical XML 1.1 (without comments).
+    Inclusive11,
+    /// Exclusive Canonical XML (with comments).
+    Exclusive10WithComments,
+    /// Exclusive Canonical XML (without comments).
+    Exclusive10,
+}
diff --git a/src/error.rs b/src/error.rs
new file mode 100644
index 0000000..219e55d
--- /dev/null
+++ b/src/error.rs
@@ -0,0 +1,33 @@
+//! Error types for xml-sec.
+
+/// Errors that can occur during XML security operations.
+#[derive(Debug, thiserror::Error)]
+pub enum XmlSecError {
+    /// XML parsing error.
+    #[error("XML parse error: {0}")]
+    XmlParse(String),
+
+    /// Canonicalization error.
+    #[error("C14N error: {0}")]
+    Canonicalization(String),
+
+    /// Signature verification failed.
+    #[error("Signature verification failed: {0}")]
+    SignatureInvalid(String),
+
+    /// Unsupported algorithm.
+    #[error("Unsupported algorithm: {0}")]
+    UnsupportedAlgorithm(String),
+
+    /// Certificate error.
+    #[error("Certificate error: {0}")]
+    Certificate(String),
+
+    /// Cryptographic operation failed.
+    #[error("Crypto error: {0}")]
+    Crypto(String),
+
+    /// Key not found or invalid.
+    #[error("Key error: {0}")]
+    Key(String),
+}
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..992babe
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,36 @@
+//! # xml-sec — Pure Rust XML Security
+//!
+//! Drop-in replacement for libxmlsec1. XMLDSig, XMLEnc, C14N — no C dependencies.
+//!
+//! ## Features
+//!
+//! - **C14N** — XML Canonicalization (inclusive + exclusive)
+//! - **XMLDSig** — XML Digital Signatures (sign + verify)
+//! - **XMLEnc** — XML Encryption (encrypt + decrypt)
+//! - **X.509** — Certificate-based key extraction
+//!
+//! ## Quick Start
+//!
+//! ```rust,no_run
+//! use xml_sec::{XmlSigner, XmlVerifier};
+//!
+//! // Verify a signed XML document
+//! let doc = std::fs::read_to_string("signed.xml").unwrap();
+//! let cert = std::fs::read("cert.pem").unwrap();
+//! let valid = XmlVerifier::new(&cert).verify(&doc).unwrap();
+//! ```
+
+#![deny(unsafe_code)]
+#![deny(clippy::unwrap_used)]
+#![warn(missing_docs)]
+
+pub mod c14n;
+pub mod error;
+
+#[cfg(feature = "xmldsig")]
+pub mod xmldsig;
+
+#[cfg(feature = "xmlenc")]
+pub mod xmlenc;
+
+pub use error::XmlSecError;
diff --git a/src/xmldsig/mod.rs b/src/xmldsig/mod.rs
new file mode 100644
index 0000000..04a4156
--- /dev/null
+++ b/src/xmldsig/mod.rs
@@ -0,0 +1,3 @@
+//! XML Digital Signatures (XMLDSig).
+//!
+//! Implements [XML Signature Syntax and Processing](https://www.w3.org/TR/xmldsig-core1/).
diff --git a/src/xmlenc/mod.rs b/src/xmlenc/mod.rs
new file mode 100644
index 0000000..0132432
--- /dev/null
+++ b/src/xmlenc/mod.rs
@@ -0,0 +1,3 @@
+//! XML Encryption (XMLEnc).
+//!
+//! Implements [XML Encryption Syntax and Processing](https://www.w3.org/TR/xmlenc-core1/).