ring/ec/suite_b/
curve.rs

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1// Copyright 2015-2017 Brian Smith.
2//
3// Permission to use, copy, modify, and/or distribute this software for any
4// purpose with or without fee is hereby granted, provided that the above
5// copyright notice and this permission notice appear in all copies.
6//
7// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
8// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
9// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
10// SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
11// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
12// OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
13// CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
14
15use crate::{cpu, ec, error, rand};
16
17/// A key agreement algorithm.
18macro_rules! suite_b_curve {
19    ( $NAME:ident, $bits:expr, $private_key_ops:expr, $id:expr,
20      $check_private_key_bytes:ident, $generate_private_key:ident,
21      $public_from_private:ident) => {
22        /// Public keys are encoding in uncompressed form using the
23        /// Octet-String-to-Elliptic-Curve-Point algorithm in
24        /// [SEC 1: Elliptic Curve Cryptography, Version 2.0]. Public keys are
25        /// validated during key agreement according to
26        /// [NIST Special Publication 800-56A, revision 2] and Appendix B.3 of
27        /// the NSA's [Suite B Implementer's Guide to NIST SP 800-56A].
28        ///
29        /// [SEC 1: Elliptic Curve Cryptography, Version 2.0]:
30        ///     http://www.secg.org/sec1-v2.pdf
31        /// [NIST Special Publication 800-56A, revision 2]:
32        ///     http://nvlpubs.nist.gov/nistpubs/SpecialPublications/NIST.SP.800-56Ar2.pdf
33        /// [Suite B Implementer's Guide to NIST SP 800-56A]:
34        ///     https://github.com/briansmith/ring/blob/main/doc/ecdh.pdf
35        pub static $NAME: ec::Curve = ec::Curve {
36            public_key_len: 1 + (2 * (($bits + 7) / 8)),
37            elem_scalar_seed_len: ($bits + 7) / 8,
38            id: $id,
39            check_private_key_bytes: $check_private_key_bytes,
40            generate_private_key: $generate_private_key,
41            public_from_private: $public_from_private,
42        };
43
44        fn $check_private_key_bytes(
45            bytes: &[u8],
46            cpu: cpu::Features,
47        ) -> Result<(), error::Unspecified> {
48            debug_assert_eq!(bytes.len(), $bits / 8);
49            ec::suite_b::private_key::check_scalar_big_endian_bytes($private_key_ops, bytes, cpu)
50        }
51
52        fn $generate_private_key(
53            rng: &dyn rand::SecureRandom,
54            out: &mut [u8],
55            cpu: cpu::Features,
56        ) -> Result<(), error::Unspecified> {
57            ec::suite_b::private_key::generate_private_scalar_bytes($private_key_ops, rng, out, cpu)
58        }
59
60        fn $public_from_private(
61            public_out: &mut [u8],
62            private_key: &ec::Seed,
63            cpu: cpu::Features,
64        ) -> Result<(), error::Unspecified> {
65            ec::suite_b::private_key::public_from_private(
66                $private_key_ops,
67                public_out,
68                private_key,
69                cpu,
70            )
71        }
72    };
73}
74
75suite_b_curve!(
76    P256,
77    256,
78    &ec::suite_b::ops::p256::PRIVATE_KEY_OPS,
79    ec::CurveID::P256,
80    p256_check_private_key_bytes,
81    p256_generate_private_key,
82    p256_public_from_private
83);
84
85suite_b_curve!(
86    P384,
87    384,
88    &ec::suite_b::ops::p384::PRIVATE_KEY_OPS,
89    ec::CurveID::P384,
90    p384_check_private_key_bytes,
91    p384_generate_private_key,
92    p384_public_from_private
93);
ring/ec/suite_b/curve.rs

ring/ec/suite_b/
curve.rs
