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Introduce SPDX license identifiers
Licenses are boring as hell, so is are all the comments at the top of each file. This patch makes no comment on the merit of license comments in each file, rather this patch reduces the license comment to the minimum possible with no loss of meaning - an SPDX license identifier. Note also please that we remove the "written by" comments as well for the following reasons (discussed recently on rust-bitcoin repo): - they are not descriptive because many devs contributed - they have a tendency to include the wrong date because of cut'n'pasta - all this info is in the git history ref: https://spdx.dev/ids/#how
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‎no_std_test/src/main.rs‎

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// Bitcoin secp256k1 bindings
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// Written in 2019 by
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// Elichai Turkel
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//
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// To the extent possible under law, the author(s) have dedicated all
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// copyright and related and neighboring rights to this software to
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// the public domain worldwide. This software is distributed without
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// any warranty.
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//
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// You should have received a copy of the CC0 Public Domain Dedication
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// along with this software.
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// If not, see <http://creativecommons.org/publicdomain/zero/1.0/>.
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//
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// SPDX-License-Identifier: CC0-1.0
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//! # secp256k1 no-std test.
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//! This binary is a short smallest rust code to produce a working binary *without libstd*.

‎secp256k1-sys/build.rs‎

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// Bitcoin secp256k1 bindings
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// Written in 2015 by
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// Andrew Poelstra
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//
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// To the extent possible under law, the author(s) have dedicated all
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// copyright and related and neighboring rights to this software to
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// the public domain worldwide. This software is distributed without
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// any warranty.
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//
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// You should have received a copy of the CC0 Public Domain Dedication
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// along with this software.
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// If not, see <http://creativecommons.org/publicdomain/zero/1.0/>.
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//
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// SPDX-License-Identifier: CC0-1.0
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//! # Build script
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‎secp256k1-sys/src/lib.rs‎

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// Bitcoin secp256k1 bindings
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// Written in 2014 by
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// Dawid Ciężarkiewicz
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// Andrew Poelstra
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//
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// To the extent possible under law, the author(s) have dedicated all
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// copyright and related and neighboring rights to this software to
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// the public domain worldwide. This software is distributed without
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// any warranty.
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//
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// You should have received a copy of the CC0 Public Domain Dedication
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// along with this software.
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// If not, see <http://creativecommons.org/publicdomain/zero/1.0/>.
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//
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// SPDX-License-Identifier: CC0-1.0
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//! # secp256k1-sys FFI bindings
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//! Direct bindings to the underlying C library functions. These should
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//! not be needed for most users.

‎secp256k1-sys/src/macros.rs‎

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// Bitcoin secp256k1 bindings
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// Written in 2014 by
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// Dawid Ciężarkiewicz
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// Andrew Poelstra
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//
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// To the extent possible under law, the author(s) have dedicated all
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// copyright and related and neighboring rights to this software to
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// the public domain worldwide. This software is distributed without
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// any warranty.
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//
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// You should have received a copy of the CC0 Public Domain Dedication
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// along with this software.
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// If not, see <http://creativecommons.org/publicdomain/zero/1.0/>.
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//
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// SPDX-License-Identifier: CC0-1.0
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/// Implement methods and traits for types that contain an inner array.
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#[macro_export]

‎secp256k1-sys/src/recovery.rs‎

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// Bitcoin secp256k1 bindings
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// Written in 2014 by
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// Dawid Ciężarkiewicz
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// Andrew Poelstra
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//
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// To the extent possible under law, the author(s) have dedicated all
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// copyright and related and neighboring rights to this software to
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// the public domain worldwide. This software is distributed without
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// any warranty.
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//
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// You should have received a copy of the CC0 Public Domain Dedication
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// along with this software.
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// If not, see <http://creativecommons.org/publicdomain/zero/1.0/>.
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//
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// SPDX-License-Identifier: CC0-1.0
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//! # FFI of the recovery module
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‎secp256k1-sys/src/types.rs‎

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// SPDX-License-Identifier: CC0-1.0
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#![allow(non_camel_case_types)]
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pub type c_int = i32;

‎src/constants.rs‎

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// Bitcoin secp256k1 bindings
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// Written in 2014 by
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// Dawid Ciężarkiewicz
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// Andrew Poelstra
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//
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// To the extent possible under law, the author(s) have dedicated all
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// copyright and related and neighboring rights to this software to
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// the public domain worldwide. This software is distributed without
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// any warranty.
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//
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// You should have received a copy of the CC0 Public Domain Dedication
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// along with this software.
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// If not, see <http://creativecommons.org/publicdomain/zero/1.0/>.
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//
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// SPDX-License-Identifier: CC0-1.0
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//! Constants related to the API and the underlying curve.
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//!

‎src/context.rs‎

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// SPDX-License-Identifier: CC0-1.0
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use core::marker::PhantomData;
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use core::mem::ManuallyDrop;
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use core::ptr::NonNull;

‎src/ecdh.rs‎

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// Bitcoin secp256k1 bindings
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// Written in 2015 by
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// Andrew Poelstra
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//
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// To the extent possible under law, the author(s) have dedicated all
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// copyright and related and neighboring rights to this software to
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// the public domain worldwide. This software is distributed without
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// any warranty.
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//
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// You should have received a copy of the CC0 Public Domain Dedication
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// along with this software.
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// If not, see <http://creativecommons.org/publicdomain/zero/1.0/>.
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//
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// SPDX-License-Identifier: CC0-1.0
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//! Support for shared secret computations.
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//!

‎src/ecdsa/mod.rs‎

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// SPDX-License-Identifier: CC0-1.0
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//! Structs and functionality related to the ECDSA signature algorithm.
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//!
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