Struct SecKeyExchangeParameters

Source

pub struct SecKeyExchangeParameters { /* private fields */ }

Expand description

Typed wrapper for the SecKeyKeyExchangeParameter* dictionary accepted by LAPrivateKey::exchange_keys_with_public_key.

Implementations§

Source §

impl SecKeyExchangeParameters

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pub fn new() -> Self

Create an empty parameter dictionary.

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pub const fn with_requested_size(requested_size: usize) -> Self

Create a dictionary that requests a derived key of the supplied length.

Examples found in repository ?

examples/09_public_key.rs (line 43)

12fn main() -> Result<(), Box<dyn std::error::Error>> {
13    let store = LARightStore::shared()?;
14    let first_right = LARight::new()?;
15    let second_right = LARight::new()?;
16    let first_identifier = unique_identifier("public-key-a");
17    let second_identifier = unique_identifier("public-key-b");
18
19    match store.save_right(&first_right, &first_identifier) {
20        Ok(first) => {
21            let public_key = first.public_key()?;
22            let sign = SecKeyAlgorithm::ecdsa_signature_message_x962_sha256();
23            let encrypt =
24                SecKeyAlgorithm::ecies_encryption_cofactor_variable_iv_x963_sha256_aes_gcm();
25            let exchange = SecKeyAlgorithm::ecdh_key_exchange_cofactor_x963_sha256();
26            let first_private_key = first.key()?;
27
28            println!("public key bytes: {}", public_key.export_bytes()?.len());
29            println!("can verify: {}", public_key.can_verify_using(&sign)?);
30            println!("can encrypt: {}", public_key.can_encrypt_using(&encrypt)?);
31            println!("private key can sign: {}", first_private_key.can_sign_using(&sign)?);
32            println!(
33                "private key can exchange: {}",
34                first_private_key.can_exchange_keys_using(&exchange)?
35            );
36
37            match store.save_right(&second_right, &second_identifier) {
38                Ok(second) => {
39                    let second_private_key = second.key()?;
40                    if first_private_key.can_exchange_keys_using(&exchange)?
41                        && second_private_key.can_exchange_keys_using(&exchange)?
42                    {
43                        let parameters = SecKeyExchangeParameters::with_requested_size(32)
44                            .with_shared_info(b"localauthentication-rs");
45                        let first_public_key = first_private_key.public_key()?.export_bytes()?;
46                        let second_public_key = second_private_key.public_key()?.export_bytes()?;
47
48                        match (
49                            first_private_key.exchange_keys_with_public_key(
50                                &second_public_key,
51                                &exchange,
52                                &parameters,
53                            ),
54                            second_private_key.exchange_keys_with_public_key(
55                                &first_public_key,
56                                &exchange,
57                                &parameters,
58                            ),
59                        ) {
60                            (Ok(first_secret), Ok(second_secret)) => {
61                                println!("shared secret bytes: {}", first_secret.len());
62                                println!("shared secrets match: {}", first_secret == second_secret);
63                            }
64                            (Err(error), _) | (_, Err(error)) => {
65                                println!("key exchange requires additional system support: {error}");
66                            }
67                        }
68                    }
69                    store.remove_right(&second)?;
70                }
71                Err(error) => {
72                    println!("key-exchange demo needs two persisted keys: {error}");
73                }
74            }
75
76            store.remove_right(&first)?;
77        }
78        Err(error) => {
79            println!("public-key APIs need entitlements on many systems: {error}");
80        }
81    }
82
83    println!("✅ public-key smoke OK");
84    Ok(())
85}

Source

pub const fn requested_size(self, requested_size: usize) -> Self

Override the requested derived-key length.

Source

pub fn with_shared_info(self, shared_info: impl Into<Vec<u8>>) -> Self

Attach additional shared info for algorithms that support KDF context data.

Examples found in repository ?

examples/09_public_key.rs (line 44)

12fn main() -> Result<(), Box<dyn std::error::Error>> {
13    let store = LARightStore::shared()?;
14    let first_right = LARight::new()?;
15    let second_right = LARight::new()?;
16    let first_identifier = unique_identifier("public-key-a");
17    let second_identifier = unique_identifier("public-key-b");
18
19    match store.save_right(&first_right, &first_identifier) {
20        Ok(first) => {
21            let public_key = first.public_key()?;
22            let sign = SecKeyAlgorithm::ecdsa_signature_message_x962_sha256();
23            let encrypt =
24                SecKeyAlgorithm::ecies_encryption_cofactor_variable_iv_x963_sha256_aes_gcm();
25            let exchange = SecKeyAlgorithm::ecdh_key_exchange_cofactor_x963_sha256();
26            let first_private_key = first.key()?;
27
28            println!("public key bytes: {}", public_key.export_bytes()?.len());
29            println!("can verify: {}", public_key.can_verify_using(&sign)?);
30            println!("can encrypt: {}", public_key.can_encrypt_using(&encrypt)?);
31            println!("private key can sign: {}", first_private_key.can_sign_using(&sign)?);
32            println!(
33                "private key can exchange: {}",
34                first_private_key.can_exchange_keys_using(&exchange)?
35            );
36
37            match store.save_right(&second_right, &second_identifier) {
38                Ok(second) => {
39                    let second_private_key = second.key()?;
40                    if first_private_key.can_exchange_keys_using(&exchange)?
41                        && second_private_key.can_exchange_keys_using(&exchange)?
42                    {
43                        let parameters = SecKeyExchangeParameters::with_requested_size(32)
44                            .with_shared_info(b"localauthentication-rs");
45                        let first_public_key = first_private_key.public_key()?.export_bytes()?;
46                        let second_public_key = second_private_key.public_key()?.export_bytes()?;
47
48                        match (
49                            first_private_key.exchange_keys_with_public_key(
50                                &second_public_key,
51                                &exchange,
52                                &parameters,
53                            ),
54                            second_private_key.exchange_keys_with_public_key(
55                                &first_public_key,
56                                &exchange,
57                                &parameters,
58                            ),
59                        ) {
60                            (Ok(first_secret), Ok(second_secret)) => {
61                                println!("shared secret bytes: {}", first_secret.len());
62                                println!("shared secrets match: {}", first_secret == second_secret);
63                            }
64                            (Err(error), _) | (_, Err(error)) => {
65                                println!("key exchange requires additional system support: {error}");
66                            }
67                        }
68                    }
69                    store.remove_right(&second)?;
70                }
71                Err(error) => {
72                    println!("key-exchange demo needs two persisted keys: {error}");
73                }
74            }
75
76            store.remove_right(&first)?;
77        }
78        Err(error) => {
79            println!("public-key APIs need entitlements on many systems: {error}");
80        }
81    }
82
83    println!("✅ public-key smoke OK");
84    Ok(())
85}