ssh/algorithm/key_exchange/
dh.rs

1use num_bigint::{BigUint, RandBigInt};
2use std::ops::Shl;
3
4use crate::SshResult;
5
6use super::{HashType, KeyExchange};
7
8#[cfg(feature = "deprecated-dh-group1-sha1")]
9const GROUP1: [u8; 128] = [
10    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc9, 0xf, 0xda, 0xa2, 0x21, 0x68, 0xc2, 0x34,
11    0xc4, 0xc6, 0x62, 0x8b, 0x80, 0xdc, 0x1c, 0xd1, 0x29, 0x2, 0x4e, 0x8, 0x8a, 0x67, 0xcc, 0x74,
12    0x2, 0xb, 0xbe, 0xa6, 0x3b, 0x13, 0x9b, 0x22, 0x51, 0x4a, 0x8, 0x79, 0x8e, 0x34, 0x4, 0xdd,
13    0xef, 0x95, 0x19, 0xb3, 0xcd, 0x3a, 0x43, 0x1b, 0x30, 0x2b, 0xa, 0x6d, 0xf2, 0x5f, 0x14, 0x37,
14    0x4f, 0xe1, 0x35, 0x6d, 0x6d, 0x51, 0xc2, 0x45, 0xe4, 0x85, 0xb5, 0x76, 0x62, 0x5e, 0x7e, 0xc6,
15    0xf4, 0x4c, 0x42, 0xe9, 0xa6, 0x37, 0xed, 0x6b, 0xb, 0xff, 0x5c, 0xb6, 0xf4, 0x6, 0xb7, 0xed,
16    0xee, 0x38, 0x6b, 0xfb, 0x5a, 0x89, 0x9f, 0xa5, 0xae, 0x9f, 0x24, 0x11, 0x7c, 0x4b, 0x1f, 0xe6,
17    0x49, 0x28, 0x66, 0x51, 0xec, 0xe6, 0x53, 0x81, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
18];
19
20const GROUP14: [u8; 256] = [
21    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xc9, 0xf, 0xda, 0xa2, 0x21, 0x68, 0xc2, 0x34,
22    0xc4, 0xc6, 0x62, 0x8b, 0x80, 0xdc, 0x1c, 0xd1, 0x29, 0x2, 0x4e, 0x8, 0x8a, 0x67, 0xcc, 0x74,
23    0x2, 0xb, 0xbe, 0xa6, 0x3b, 0x13, 0x9b, 0x22, 0x51, 0x4a, 0x8, 0x79, 0x8e, 0x34, 0x4, 0xdd,
24    0xef, 0x95, 0x19, 0xb3, 0xcd, 0x3a, 0x43, 0x1b, 0x30, 0x2b, 0xa, 0x6d, 0xf2, 0x5f, 0x14, 0x37,
25    0x4f, 0xe1, 0x35, 0x6d, 0x6d, 0x51, 0xc2, 0x45, 0xe4, 0x85, 0xb5, 0x76, 0x62, 0x5e, 0x7e, 0xc6,
26    0xf4, 0x4c, 0x42, 0xe9, 0xa6, 0x37, 0xed, 0x6b, 0xb, 0xff, 0x5c, 0xb6, 0xf4, 0x6, 0xb7, 0xed,
27    0xee, 0x38, 0x6b, 0xfb, 0x5a, 0x89, 0x9f, 0xa5, 0xae, 0x9f, 0x24, 0x11, 0x7c, 0x4b, 0x1f, 0xe6,
28    0x49, 0x28, 0x66, 0x51, 0xec, 0xe4, 0x5b, 0x3d, 0xc2, 0x0, 0x7c, 0xb8, 0xa1, 0x63, 0xbf, 0x5,
29    0x98, 0xda, 0x48, 0x36, 0x1c, 0x55, 0xd3, 0x9a, 0x69, 0x16, 0x3f, 0xa8, 0xfd, 0x24, 0xcf, 0x5f,
30    0x83, 0x65, 0x5d, 0x23, 0xdc, 0xa3, 0xad, 0x96, 0x1c, 0x62, 0xf3, 0x56, 0x20, 0x85, 0x52, 0xbb,
31    0x9e, 0xd5, 0x29, 0x7, 0x70, 0x96, 0x96, 0x6d, 0x67, 0xc, 0x35, 0x4e, 0x4a, 0xbc, 0x98, 0x4,
32    0xf1, 0x74, 0x6c, 0x8, 0xca, 0x18, 0x21, 0x7c, 0x32, 0x90, 0x5e, 0x46, 0x2e, 0x36, 0xce, 0x3b,
33    0xe3, 0x9e, 0x77, 0x2c, 0x18, 0xe, 0x86, 0x3, 0x9b, 0x27, 0x83, 0xa2, 0xec, 0x7, 0xa2, 0x8f,
34    0xb5, 0xc5, 0x5d, 0xf0, 0x6f, 0x4c, 0x52, 0xc9, 0xde, 0x2b, 0xcb, 0xf6, 0x95, 0x58, 0x17, 0x18,
35    0x39, 0x95, 0x49, 0x7c, 0xea, 0x95, 0x6a, 0xe5, 0x15, 0xd2, 0x26, 0x18, 0x98, 0xfa, 0x5, 0x10,
36    0x15, 0x72, 0x8e, 0x5a, 0x8a, 0xac, 0xaa, 0x68, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
37];
38
39struct DhGroup {
40    prime: &'static [u8],
41    generator: usize,
42    exp_size: u64,
43}
44
45#[cfg(feature = "deprecated-dh-group1-sha1")]
46const DH_GROUP1: DhGroup = DhGroup {
47    prime: &GROUP1,
48    generator: 2,
49    exp_size: 256,
50};
51
52const DH_GROUP14: DhGroup = DhGroup {
53    prime: &GROUP14,
54    generator: 2,
55    exp_size: 256,
56};
57
58fn biguint_to_mpint(biguint: &BigUint) -> Vec<u8> {
59    let mut mpint = Vec::new();
60    let bytes = biguint.to_bytes_be();
61    if let Some(b) = bytes.first() {
62        if b > &0x7f {
63            mpint.push(0);
64        }
65    }
66    mpint.extend(&bytes);
67    mpint
68}
69
70macro_rules! create_dh_with_group {
71    ($name: ident, $group: expr, $hash: expr) => {
72        pub(super) struct $name {
73            prime: BigUint,
74            private_key: BigUint,
75            public_key: Vec<u8>,
76        }
77
78        impl KeyExchange for $name {
79            fn new() -> SshResult<Self> {
80                let mut rng = rand::thread_rng();
81                let group = &($group);
82                let prime = BigUint::from_bytes_be(&group.prime);
83                let private_key = rng.gen_biguint((group.exp_size * 8) - 2u64).shl(1);
84                let public_key =
85                    biguint_to_mpint(&BigUint::from(group.generator).modpow(&private_key, &prime));
86
87                Ok(Self {
88                    prime,
89                    private_key,
90                    public_key,
91                })
92            }
93
94            fn get_public_key(&self) -> &[u8] {
95                &self.public_key
96            }
97
98            fn get_shared_secret(&self, puk: Vec<u8>) -> SshResult<Vec<u8>> {
99                let other_pub = BigUint::from_bytes_be(&puk);
100                let shared_secret = other_pub.modpow(&self.private_key, &self.prime);
101                Ok(biguint_to_mpint(&shared_secret))
102            }
103
104            fn get_hash_type(&self) -> HashType {
105                $hash
106            }
107        }
108    };
109}
110
111#[cfg(feature = "deprecated-dh-group1-sha1")]
112create_dh_with_group!(DiffieHellmanGroup1Sha1, DH_GROUP1, HashType::SHA1);
113create_dh_with_group!(DiffieHellmanGroup14Sha1, DH_GROUP14, HashType::SHA1);
114create_dh_with_group!(DiffieHellmanGroup14Sha256, DH_GROUP14, HashType::SHA256);
ssh/algorithm/key_exchange/dh.rs

ssh/algorithm/key_exchange/
dh.rs
