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use core::marker::PhantomData;
use ffi;
use types::{c_uint, c_void};
use Error;
use Secp256k1;
#[cfg(feature = "std")]
pub use self::std_only::*;
pub unsafe trait Context {
const FLAGS: c_uint;
const DESCRIPTION: &'static str;
fn deallocate(ptr: *mut [u8]);
}
pub trait Signing: Context {}
pub trait Verification: Context {}
pub struct SignOnlyPreallocated<'buf> {
phantom: PhantomData<&'buf ()>,
}
pub struct VerifyOnlyPreallocated<'buf> {
phantom: PhantomData<&'buf ()>,
}
pub struct AllPreallocated<'buf> {
phantom: PhantomData<&'buf ()>,
}
#[cfg(feature = "std")]
mod std_only {
use super::*;
pub enum SignOnly {}
pub enum VerifyOnly {}
pub enum All {}
impl Signing for SignOnly {}
impl Signing for All {}
impl Verification for VerifyOnly {}
impl Verification for All {}
unsafe impl Context for SignOnly {
const FLAGS: c_uint = ffi::SECP256K1_START_SIGN;
const DESCRIPTION: &'static str = "signing only";
fn deallocate(ptr: *mut [u8]) {
let _ = unsafe { Box::from_raw(ptr) };
}
}
unsafe impl Context for VerifyOnly {
const FLAGS: c_uint = ffi::SECP256K1_START_VERIFY;
const DESCRIPTION: &'static str = "verification only";
fn deallocate(ptr: *mut [u8]) {
let _ = unsafe { Box::from_raw(ptr) };
}
}
unsafe impl Context for All {
const FLAGS: c_uint = VerifyOnly::FLAGS | SignOnly::FLAGS;
const DESCRIPTION: &'static str = "all capabilities";
fn deallocate(ptr: *mut [u8]) {
let _ = unsafe { Box::from_raw(ptr) };
}
}
impl<C: Context> Secp256k1<C> {
pub fn gen_new() -> Secp256k1<C> {
let buf = vec![0u8; Self::preallocate_size_gen()].into_boxed_slice();
let ptr = Box::into_raw(buf);
Secp256k1 {
ctx: unsafe { ffi::secp256k1_context_preallocated_create(ptr as *mut c_void, C::FLAGS) },
phantom: PhantomData,
buf: ptr,
}
}
}
impl Secp256k1<All> {
pub fn new() -> Secp256k1<All> {
Secp256k1::gen_new()
}
}
impl Secp256k1<SignOnly> {
pub fn signing_only() -> Secp256k1<SignOnly> {
Secp256k1::gen_new()
}
}
impl Secp256k1<VerifyOnly> {
pub fn verification_only() -> Secp256k1<VerifyOnly> {
Secp256k1::gen_new()
}
}
impl Default for Secp256k1<All> {
fn default() -> Self {
Self::new()
}
}
impl<C: Context> Clone for Secp256k1<C> {
fn clone(&self) -> Secp256k1<C> {
let clone_size = unsafe {ffi::secp256k1_context_preallocated_clone_size(self.ctx)};
let ptr_buf = Box::into_raw(vec![0u8; clone_size].into_boxed_slice());
Secp256k1 {
ctx: unsafe { ffi::secp256k1_context_preallocated_clone(self.ctx, ptr_buf as *mut c_void) },
phantom: PhantomData,
buf: ptr_buf,
}
}
}
}
impl<'buf> Signing for SignOnlyPreallocated<'buf> {}
impl<'buf> Signing for AllPreallocated<'buf> {}
impl<'buf> Verification for VerifyOnlyPreallocated<'buf> {}
impl<'buf> Verification for AllPreallocated<'buf> {}
unsafe impl<'buf> Context for SignOnlyPreallocated<'buf> {
const FLAGS: c_uint = ffi::SECP256K1_START_SIGN;
const DESCRIPTION: &'static str = "signing only";
fn deallocate(_ptr: *mut [u8]) {
}
}
unsafe impl<'buf> Context for VerifyOnlyPreallocated<'buf> {
const FLAGS: c_uint = ffi::SECP256K1_START_VERIFY;
const DESCRIPTION: &'static str = "verification only";
fn deallocate(_ptr: *mut [u8]) {
}
}
unsafe impl<'buf> Context for AllPreallocated<'buf> {
const FLAGS: c_uint = SignOnlyPreallocated::FLAGS | VerifyOnlyPreallocated::FLAGS;
const DESCRIPTION: &'static str = "all capabilities";
fn deallocate(_ptr: *mut [u8]) {
}
}
impl<'buf, C: Context + 'buf> Secp256k1<C> {
pub fn preallocated_gen_new(buf: &'buf mut [u8]) -> Result<Secp256k1<C>, Error> {
if buf.len() < Self::preallocate_size_gen() {
return Err(Error::NotEnoughMemory);
}
Ok(Secp256k1 {
ctx: unsafe {
ffi::secp256k1_context_preallocated_create(
buf.as_mut_ptr() as *mut c_void,
C::FLAGS)
},
phantom: PhantomData,
buf: buf as *mut [u8],
})
}
}
impl<'buf> Secp256k1<AllPreallocated<'buf>> {
pub fn preallocated_new(buf: &'buf mut [u8]) -> Result<Secp256k1<AllPreallocated<'buf>>, Error> {
Secp256k1::preallocated_gen_new(buf)
}
pub fn preallocate_size() -> usize {
Self::preallocate_size_gen()
}
}
impl<'buf> Secp256k1<SignOnlyPreallocated<'buf>> {
pub fn preallocated_signing_only(buf: &'buf mut [u8]) -> Result<Secp256k1<SignOnlyPreallocated<'buf>>, Error> {
Secp256k1::preallocated_gen_new(buf)
}
#[inline]
pub fn preallocate_signing_size() -> usize {
Self::preallocate_size_gen()
}
}
impl<'buf> Secp256k1<VerifyOnlyPreallocated<'buf>> {
pub fn preallocated_verification_only(buf: &'buf mut [u8]) -> Result<Secp256k1<VerifyOnlyPreallocated<'buf>>, Error> {
Secp256k1::preallocated_gen_new(buf)
}
#[inline]
pub fn preallocate_verification_size() -> usize {
Self::preallocate_size_gen()
}
}