From b3a4ad197f84b22883c2c2f4114b0e3472af60ee Mon Sep 17 00:00:00 2001
From: Justus Winter <justus@sequoia-pgp.org>
Date: Thu, 10 Jan 2019 11:12:35 +0100
Subject: ffi: New module openpgp/crypto.

---
 ffi/include/sequoia/openpgp.h        |  2 ++
 ffi/include/sequoia/openpgp/crypto.h | 50 ++++++++++++++++++++++++++++++++
 ffi/src/openpgp/crypto.rs            | 56 ++++++++++++++++++++++++++++++++++++
 ffi/src/openpgp/mod.rs               |  1 +
 4 files changed, 109 insertions(+)
 create mode 100644 ffi/include/sequoia/openpgp/crypto.h
 create mode 100644 ffi/src/openpgp/crypto.rs

(limited to 'ffi')

diff --git a/ffi/include/sequoia/openpgp.h b/ffi/include/sequoia/openpgp.h
index 5900d565..40c45d55 100644
--- a/ffi/include/sequoia/openpgp.h
+++ b/ffi/include/sequoia/openpgp.h
@@ -4,6 +4,8 @@
 #include <sequoia/core.h>
 #include <time.h>
 
+#include <sequoia/openpgp/crypto.h>
+
 /*/
 /// A low-level OpenPGP message parser.
 ///
diff --git a/ffi/include/sequoia/openpgp/crypto.h b/ffi/include/sequoia/openpgp/crypto.h
new file mode 100644
index 00000000..1c30fe3f
--- /dev/null
+++ b/ffi/include/sequoia/openpgp/crypto.h
@@ -0,0 +1,50 @@
+#ifndef SEQUOIA_OPENPGP_CRYPTO_H
+#define SEQUOIA_OPENPGP_CRYPTO_H
+
+typedef struct sq_mpi *sq_mpi_t;
+
+/*/
+/// Creates a signature.
+///
+/// This is a low-level mechanism to produce an arbitrary OpenPGP
+/// signature.  Using this trait allows Sequoia to perform all
+/// operations involving signing to use a variety of secret key
+/// storage mechanisms (e.g. smart cards).
+/*/
+typedef struct sq_signer *sq_signer_t;
+
+/*/
+/// Frees a signer.
+/*/
+void sq_signer_free (sq_signer_t s);
+
+/*/
+/// A cryptographic key pair.
+///
+/// A `KeyPair` is a combination of public and secret key.  If both
+/// are available in memory, a `KeyPair` is a convenient
+/*/
+typedef struct sq_key_pair *sq_key_pair_t;
+
+/* Forward declaration.  */
+typedef struct sq_p_key *sq_p_key_t;
+
+/*/
+/// Creates a new key pair.
+/*/
+void sq_key_pair_new (sq_p_key_t public, sq_mpi_t secret);
+
+/*/
+/// Frees a key pair.
+/*/
+void sq_key_pair_free (sq_key_pair_t kp);
+
+/*/
+/// Creates a signer from a key pair.
+///
+/// Note that the returned object merely references the key pair, and
+/// must not outlive the key pair.
+/*/
+sq_signer_t sq_key_pair_as_signer (sq_key_pair_t kp);
+
+#endif /* SEQUOIA_OPENPGP_CRYPTO_H */
diff --git a/ffi/src/openpgp/crypto.rs b/ffi/src/openpgp/crypto.rs
new file mode 100644
index 00000000..4236568f
--- /dev/null
+++ b/ffi/src/openpgp/crypto.rs
@@ -0,0 +1,56 @@
+//! Cryptographic primitives.
+//!
+//! Wraps [`sequoia-openpgp::crypto`].
+//!
+//! [`sequoia-openpgp::crypto`]: ../../../sequoia_openpgp/crypto/index.html
+
+use ::core::Context;
+
+extern crate sequoia_openpgp;
+use self::sequoia_openpgp::{
+    crypto,
+    packet::Key,
+};
+
+/// Frees a signer.
+#[no_mangle]
+pub extern "system" fn sq_signer_free
+    (s: Option<&mut &'static mut crypto::Signer>)
+{
+    ffi_free!(s)
+}
+
+/// Creates a new key pair.
+#[no_mangle]
+pub extern "system" fn sq_key_pair_new
+    (ctx: *mut Context, public: *mut Key, secret: *mut crypto::mpis::SecretKey)
+     -> *mut crypto::KeyPair
+{
+    let ctx = ffi_param_ref_mut!(ctx);
+    let public = ffi_param_move!(public);
+    let secret = ffi_param_move!(secret);
+    fry_box!(ctx, crypto::KeyPair::new(*public, *secret))
+}
+
+/// Frees a key pair.
+#[no_mangle]
+pub extern "system" fn sq_key_pair_free
+    (kp: Option<&mut crypto::KeyPair>)
+{
+    ffi_free!(kp)
+}
+
+/// Creates a signer from a key pair.
+///
+/// Note that the returned object merely references the key pair, and
+/// must not outlive the key pair.
+#[no_mangle]
+pub extern "system" fn sq_key_pair_as_signer
+    (kp: *mut crypto::KeyPair)
+     -> *mut &'static mut crypto::Signer
+{
+    let kp = ffi_param_ref_mut!(kp);
+    let signer: &mut crypto::Signer = kp;
+    box_raw!(signer)
+    //box_raw!(kp)
+}
diff --git a/ffi/src/openpgp/mod.rs b/ffi/src/openpgp/mod.rs
index 2a663763..1f5081e6 100644
--- a/ffi/src/openpgp/mod.rs
+++ b/ffi/src/openpgp/mod.rs
@@ -54,6 +54,7 @@ use super::error::Status;
 use super::core::Context;
 
 pub mod armor;
+pub mod crypto;
 pub mod fingerprint;
 pub mod keyid;
 pub mod packet_pile;
-- 
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