1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
// Copyright 2021 Contributors to the Parsec project.
// SPDX-License-Identifier: Apache-2.0
//! # PsaVerifyMessage operation
//!
//! Verify the signature of a message using a public key.
use super::psa_key_attributes::Attributes;
use crate::operations::psa_algorithm::AsymmetricSignature;
/// Native object for asymmetric verification of signatures.
#[derive(Debug)]
pub struct Operation {
/// `key_name` specifies the key to be used for verification.
pub key_name: String,
/// An asymmetric signature algorithm that separates the hash and sign operations, that is
/// compatible with the type of key.
pub alg: AsymmetricSignature,
/// The `message` whose signature is to be verified for the
/// asymmetric signing operation.
pub message: zeroize::Zeroizing<Vec<u8>>,
/// Buffer containing the signature to verify.
pub signature: zeroize::Zeroizing<Vec<u8>>,
}
/// Native object for asymmetric verification of signatures.
///
/// The true result of the operation is sent as a `status` code in the response.
#[derive(Copy, Clone, Debug)]
pub struct Result;
impl Operation {
/// Validate the contents of the operation against the attributes of the key it targets
///
/// This method checks that:
/// * the key policy allows verifying signatures on messages
/// * the key policy allows the verification algorithm requested in the operation
/// * the key type is compatible with the requested algorithm
pub fn validate(&self, key_attributes: Attributes) -> crate::requests::Result<()> {
key_attributes.can_verify_message()?;
key_attributes.permits_alg(self.alg.into())?;
key_attributes.compatible_with_alg(self.alg.into())?;
Ok(())
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::operations::psa_algorithm::{Algorithm, AsymmetricSignature, Hash};
use crate::operations::psa_key_attributes::{EccFamily, Lifetime, Policy, Type, UsageFlags};
use crate::requests::ResponseStatus;
fn get_attrs() -> Attributes {
let mut usage_flags = UsageFlags::default();
let _ = usage_flags.set_verify_hash();
Attributes {
lifetime: Lifetime::Persistent,
key_type: Type::EccKeyPair {
curve_family: EccFamily::SecpR1,
},
bits: 256,
policy: Policy {
usage_flags,
permitted_algorithms: Algorithm::AsymmetricSignature(AsymmetricSignature::Ecdsa {
hash_alg: Hash::Sha256.into(),
}),
},
}
}
#[test]
fn validate_success() {
(Operation {
key_name: String::from("some key"),
alg: AsymmetricSignature::Ecdsa {
hash_alg: Hash::Sha256.into(),
},
message: vec![0xff; 32].into(),
signature: vec![0xa5; 65].into(),
})
.validate(get_attrs())
.unwrap();
}
#[test]
fn cannot_sign() {
let mut attrs = get_attrs();
attrs.policy.usage_flags = UsageFlags::default();
assert_eq!(
(Operation {
key_name: String::from("some key"),
alg: AsymmetricSignature::Ecdsa {
hash_alg: Hash::Sha256.into(),
},
message: vec![0xff; 32].into(),
signature: vec![0xa5; 65].into(),
})
.validate(attrs)
.unwrap_err(),
ResponseStatus::PsaErrorNotPermitted
);
}
#[test]
fn wrong_algorithm() {
assert_eq!(
(Operation {
key_name: String::from("some key"),
alg: AsymmetricSignature::Ecdsa {
hash_alg: Hash::Sha224.into(),
},
message: vec![0xff; 28].into(),
signature: vec![0xa5; 65].into(),
})
.validate(get_attrs())
.unwrap_err(),
ResponseStatus::PsaErrorNotPermitted
);
}
#[test]
fn wrong_scheme() {
assert_eq!(
(Operation {
key_name: String::from("some key"),
alg: AsymmetricSignature::RsaPss {
hash_alg: Hash::Sha224.into(),
},
message: vec![0xff; 28].into(),
signature: vec![0xa5; 65].into(),
})
.validate(get_attrs())
.unwrap_err(),
ResponseStatus::PsaErrorNotPermitted
);
}
}