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
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176

use std::any::Any;

use crate::error::*;
use crate::handles::*;
use crate::key_exchange::KxOptions;
use crate::signatures::SignatureOptions;
use crate::symmetric::SymmetricOptions;
use crate::{AlgorithmType, CryptoCtx};

pub trait OptionsLike: Send + Sized {
    fn as_any(&self) -> &dyn Any;

    fn set(&mut self, _name: &str, _value: &[u8]) -> Result<(), CryptoError> {
        bail!(CryptoError::UnsupportedOption)
    }

    fn set_guest_buffer(
        &mut self,
        _name: &str,
        _buffer: &'static mut [u8],
    ) -> Result<(), CryptoError> {
        bail!(CryptoError::UnsupportedOption)
    }

    fn get(&self, _name: &str) -> Result<Vec<u8>, CryptoError> {
        bail!(CryptoError::UnsupportedOption)
    }

    fn set_u64(&mut self, _name: &str, _value: u64) -> Result<(), CryptoError> {
        bail!(CryptoError::UnsupportedOption)
    }

    fn get_u64(&self, _name: &str) -> Result<u64, CryptoError> {
        bail!(CryptoError::UnsupportedOption)
    }
}

#[derive(Clone, Debug)]
pub enum Options {
    Signatures(SignatureOptions),
    Symmetric(SymmetricOptions),
    KeyExchange(KxOptions),
}

impl Options {
    pub fn into_signatures(self) -> Result<SignatureOptions, CryptoError> {
        match self {
            Options::Signatures(options) => Ok(options),
            _ => bail!(CryptoError::InvalidHandle),
        }
    }

    pub fn into_symmetric(self) -> Result<SymmetricOptions, CryptoError> {
        match self {
            Options::Symmetric(options) => Ok(options),
            _ => bail!(CryptoError::InvalidHandle),
        }
    }

    pub fn into_key_exchange(self) -> Result<KxOptions, CryptoError> {
        match self {
            Options::KeyExchange(options) => Ok(options),
            _ => bail!(CryptoError::InvalidHandle),
        }
    }

    pub fn set(&mut self, name: &str, value: &[u8]) -> Result<(), CryptoError> {
        match self {
            Options::Signatures(options) => options.set(name, value),
            Options::Symmetric(options) => options.set(name, value),
            Options::KeyExchange(options) => options.set(name, value),
        }
    }

    pub fn set_guest_buffer(
        &mut self,
        name: &str,
        buffer: &'static mut [u8],
    ) -> Result<(), CryptoError> {
        match self {
            Options::Signatures(options) => options.set_guest_buffer(name, buffer),
            Options::Symmetric(options) => options.set_guest_buffer(name, buffer),
            Options::KeyExchange(options) => options.set_guest_buffer(name, buffer),
        }
    }

    pub fn get(&mut self, name: &str) -> Result<Vec<u8>, CryptoError> {
        match self {
            Options::Signatures(options) => options.get(name),
            Options::Symmetric(options) => options.get(name),
            Options::KeyExchange(options) => options.get(name),
        }
    }

    pub fn set_u64(&mut self, name: &str, value: u64) -> Result<(), CryptoError> {
        match self {
            Options::Signatures(options) => options.set_u64(name, value),
            Options::Symmetric(options) => options.set_u64(name, value),
            Options::KeyExchange(options) => options.set_u64(name, value),
        }
    }

    pub fn get_u64(&mut self, name: &str) -> Result<u64, CryptoError> {
        match self {
            Options::Signatures(options) => options.get_u64(name),
            Options::Symmetric(options) => options.get_u64(name),
            Options::KeyExchange(options) => options.get_u64(name),
        }
    }
}

impl CryptoCtx {
    pub fn options_open(&self, algorithm_type: AlgorithmType) -> Result<Handle, CryptoError> {
        let options = match algorithm_type {
            AlgorithmType::Signatures => Options::Signatures(SignatureOptions::default()),
            AlgorithmType::Symmetric => Options::Symmetric(SymmetricOptions::default()),
            AlgorithmType::KeyExchange => Options::KeyExchange(KxOptions::default()),
        };
        let handle = self.handles.options.register(options)?;
        Ok(handle)
    }

    pub fn options_close(&self, options_handle: Handle) -> Result<(), CryptoError> {
        self.handles.options.close(options_handle)
    }

    pub fn options_set(
        &self,
        options_handle: Handle,
        name: &str,
        value: &[u8],
    ) -> Result<(), CryptoError> {
        let mut options = self.handles.options.get(options_handle)?;
        options.set(name, value)
    }

    pub fn options_set_guest_buffer(
        &self,
        options_handle: Handle,
        name: &str,
        buffer: &'static mut [u8],
    ) -> Result<(), CryptoError> {
        let mut options = self.handles.options.get(options_handle)?;
        options.set_guest_buffer(name, buffer)
    }

    pub fn options_set_u64(
        &self,
        options_handle: Handle,
        name: &str,
        value: u64,
    ) -> Result<(), CryptoError> {
        let mut options = self.handles.options.get(options_handle)?;
        options.set_u64(name, value)
    }

    pub fn options_get(
        &self,
        options_handle: Handle,
        name: &str,
        value: &mut [u8],
    ) -> Result<usize, CryptoError> {
        let mut options = self.handles.options.get(options_handle)?;
        let v = options.get(name)?;
        let v_len = v.len();
        ensure!(v_len <= value.len(), CryptoError::Overflow);
        value[..v_len].copy_from_slice(&v);
        Ok(v_len)
    }

    pub fn options_get_u64(&self, options_handle: Handle, name: &str) -> Result<u64, CryptoError> {
        let mut options = self.handles.options.get(options_handle)?;
        let v = options.get_u64(name)?;
        Ok(v)
    }
}